git.oblomov.eu Git - wine/blob - dlls/wined3d/context.c

   1 /*
   2  * Context and render target management in wined3d
   3  *
   4  * Copyright 2007-2008 Stefan Dösinger for CodeWeavers
   5  * Copyright 2009 Henri Verbeet for CodeWeavers
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "config.h"
  23 #include <stdio.h>
  24 #ifdef HAVE_FLOAT_H
  25 # include <float.h>
  26 #endif
  27 #include "wined3d_private.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(d3d);
  30
  31 static DWORD wined3d_context_tls_idx;
  32
  33 /* FBO helper functions */
  34
  35 /* GL locking is done by the caller */
  36 void context_bind_fbo(struct wined3d_context *context, GLenum target, GLuint *fbo)
  37 {
  38     const struct wined3d_gl_info *gl_info = context->gl_info;
  39     GLuint f;
  40
  41     if (!fbo)
  42     {
  43         f = 0;
  44     }
  45     else
  46     {
  47         if (!*fbo)
  48         {
  49             gl_info->fbo_ops.glGenFramebuffers(1, fbo);
  50             checkGLcall("glGenFramebuffers()");
  51             TRACE("Created FBO %u.\n", *fbo);
  52         }
  53         f = *fbo;
  54     }
  55
  56     switch (target)
  57     {
  58         case GL_READ_FRAMEBUFFER:
  59             if (context->fbo_read_binding == f) return;
  60             context->fbo_read_binding = f;
  61             break;
  62
  63         case GL_DRAW_FRAMEBUFFER:
  64             if (context->fbo_draw_binding == f) return;
  65             context->fbo_draw_binding = f;
  66             break;
  67
  68         case GL_FRAMEBUFFER:
  69             if (context->fbo_read_binding == f
  70                     && context->fbo_draw_binding == f) return;
  71             context->fbo_read_binding = f;
  72             context->fbo_draw_binding = f;
  73             break;
  74
  75         default:
  76             FIXME("Unhandled target %#x.\n", target);
  77             break;
  78     }
  79
  80     gl_info->fbo_ops.glBindFramebuffer(target, f);
  81     checkGLcall("glBindFramebuffer()");
  82 }
  83
  84 /* GL locking is done by the caller */
  85 static void context_clean_fbo_attachments(const struct wined3d_gl_info *gl_info, GLenum target)
  86 {
  87     unsigned int i;
  88
  89     for (i = 0; i < gl_info->limits.buffers; ++i)
  90     {
  91         gl_info->fbo_ops.glFramebufferTexture2D(target, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, 0, 0);
  92         checkGLcall("glFramebufferTexture2D()");
  93     }
  94     gl_info->fbo_ops.glFramebufferTexture2D(target, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
  95     checkGLcall("glFramebufferTexture2D()");
  96
  97     gl_info->fbo_ops.glFramebufferTexture2D(target, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
  98     checkGLcall("glFramebufferTexture2D()");
  99 }
 100
 101 /* GL locking is done by the caller */
 102 static void context_destroy_fbo(struct wined3d_context *context, GLuint *fbo)
 103 {
 104     const struct wined3d_gl_info *gl_info = context->gl_info;
 105
 106     context_bind_fbo(context, GL_FRAMEBUFFER, fbo);
 107     context_clean_fbo_attachments(gl_info, GL_FRAMEBUFFER);
 108     context_bind_fbo(context, GL_FRAMEBUFFER, NULL);
 109
 110     gl_info->fbo_ops.glDeleteFramebuffers(1, fbo);
 111     checkGLcall("glDeleteFramebuffers()");
 112 }
 113
 114 /* GL locking is done by the caller */
 115 static void context_apply_attachment_filter_states(IWineD3DSurfaceImpl *surface, DWORD location)
 116 {
 117     IWineD3DBaseTextureImpl *texture_impl;
 118
 119     /* Update base texture states array */
 120     if (SUCCEEDED(IWineD3DSurface_GetContainer((IWineD3DSurface *)surface,
 121             &IID_IWineD3DBaseTexture, (void **)&texture_impl)))
 122     {
 123         IWineD3DDeviceImpl *device = surface->resource.device;
 124         BOOL update_minfilter = FALSE;
 125         BOOL update_magfilter = FALSE;
 126         struct gl_texture *gl_tex;
 127
 128         switch (location)
 129         {
 130             case SFLAG_INTEXTURE:
 131                 gl_tex = &texture_impl->baseTexture.texture_rgb;
 132                 break;
 133
 134             case SFLAG_INSRGBTEX:
 135                 gl_tex = &texture_impl->baseTexture.texture_srgb;
 136                 break;
 137
 138             default:
 139                 ERR("Unsupported location %s (%#x).\n", debug_surflocation(location), location);
 140                 IWineD3DBaseTexture_Release((IWineD3DBaseTexture *)texture_impl);
 141                 return;
 142         }
 143
 144         if (gl_tex->states[WINED3DTEXSTA_MINFILTER] != WINED3DTEXF_POINT
 145             || gl_tex->states[WINED3DTEXSTA_MIPFILTER] != WINED3DTEXF_NONE)
 146         {
 147             gl_tex->states[WINED3DTEXSTA_MINFILTER] = WINED3DTEXF_POINT;
 148             gl_tex->states[WINED3DTEXSTA_MIPFILTER] = WINED3DTEXF_NONE;
 149             update_minfilter = TRUE;
 150         }
 151
 152         if (gl_tex->states[WINED3DTEXSTA_MAGFILTER] != WINED3DTEXF_POINT)
 153         {
 154             gl_tex->states[WINED3DTEXSTA_MAGFILTER] = WINED3DTEXF_POINT;
 155             update_magfilter = TRUE;
 156         }
 157
 158         if (texture_impl->baseTexture.bindCount)
 159         {
 160             WARN("Render targets should not be bound to a sampler\n");
 161             IWineD3DDeviceImpl_MarkStateDirty(device, STATE_SAMPLER(texture_impl->baseTexture.sampler));
 162         }
 163
 164         IWineD3DBaseTexture_Release((IWineD3DBaseTexture *)texture_impl);
 165
 166         if (update_minfilter || update_magfilter)
 167         {
 168             GLenum target, bind_target;
 169             GLint old_binding;
 170
 171             target = surface->texture_target;
 172             if (target == GL_TEXTURE_2D)
 173             {
 174                 bind_target = GL_TEXTURE_2D;
 175                 glGetIntegerv(GL_TEXTURE_BINDING_2D, &old_binding);
 176             }
 177             else if (target == GL_TEXTURE_RECTANGLE_ARB)
 178             {
 179                 bind_target = GL_TEXTURE_RECTANGLE_ARB;
 180                 glGetIntegerv(GL_TEXTURE_BINDING_RECTANGLE_ARB, &old_binding);
 181             }
 182             else
 183             {
 184                 bind_target = GL_TEXTURE_CUBE_MAP_ARB;
 185                 glGetIntegerv(GL_TEXTURE_BINDING_CUBE_MAP_ARB, &old_binding);
 186             }
 187
 188             glBindTexture(bind_target, gl_tex->name);
 189             if (update_minfilter) glTexParameteri(bind_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 190             if (update_magfilter) glTexParameteri(bind_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 191             glBindTexture(bind_target, old_binding);
 192         }
 193
 194         checkGLcall("apply_attachment_filter_states()");
 195     }
 196 }
 197
 198 /* GL locking is done by the caller */
 199 void context_attach_depth_stencil_fbo(struct wined3d_context *context,
 200         GLenum fbo_target, IWineD3DSurfaceImpl *depth_stencil, BOOL use_render_buffer)
 201 {
 202     const struct wined3d_gl_info *gl_info = context->gl_info;
 203
 204     TRACE("Attach depth stencil %p\n", depth_stencil);
 205
 206     if (depth_stencil)
 207     {
 208         DWORD format_flags = depth_stencil->resource.format_desc->Flags;
 209
 210         if (use_render_buffer && depth_stencil->current_renderbuffer)
 211         {
 212             if (format_flags & WINED3DFMT_FLAG_DEPTH)
 213             {
 214                 gl_info->fbo_ops.glFramebufferRenderbuffer(fbo_target, GL_DEPTH_ATTACHMENT,
 215                         GL_RENDERBUFFER, depth_stencil->current_renderbuffer->id);
 216                 checkGLcall("glFramebufferRenderbuffer()");
 217             }
 218
 219             if (format_flags & WINED3DFMT_FLAG_STENCIL)
 220             {
 221                 gl_info->fbo_ops.glFramebufferRenderbuffer(fbo_target, GL_STENCIL_ATTACHMENT,
 222                         GL_RENDERBUFFER, depth_stencil->current_renderbuffer->id);
 223                 checkGLcall("glFramebufferRenderbuffer()");
 224             }
 225         }
 226         else
 227         {
 228             surface_prepare_texture(depth_stencil, gl_info, FALSE);
 229             context_apply_attachment_filter_states(depth_stencil, SFLAG_INTEXTURE);
 230
 231             if (format_flags & WINED3DFMT_FLAG_DEPTH)
 232             {
 233                 gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_DEPTH_ATTACHMENT,
 234                         depth_stencil->texture_target, depth_stencil->texture_name,
 235                         depth_stencil->texture_level);
 236                 checkGLcall("glFramebufferTexture2D()");
 237             }
 238
 239             if (format_flags & WINED3DFMT_FLAG_STENCIL)
 240             {
 241                 gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_STENCIL_ATTACHMENT,
 242                         depth_stencil->texture_target, depth_stencil->texture_name,
 243                         depth_stencil->texture_level);
 244                 checkGLcall("glFramebufferTexture2D()");
 245             }
 246         }
 247
 248         if (!(format_flags & WINED3DFMT_FLAG_DEPTH))
 249         {
 250             gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
 251             checkGLcall("glFramebufferTexture2D()");
 252         }
 253
 254         if (!(format_flags & WINED3DFMT_FLAG_STENCIL))
 255         {
 256             gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
 257             checkGLcall("glFramebufferTexture2D()");
 258         }
 259     }
 260     else
 261     {
 262         gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
 263         checkGLcall("glFramebufferTexture2D()");
 264
 265         gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
 266         checkGLcall("glFramebufferTexture2D()");
 267     }
 268 }
 269
 270 /* GL locking is done by the caller */
 271 static void context_attach_surface_fbo(const struct wined3d_context *context,
 272         GLenum fbo_target, DWORD idx, IWineD3DSurfaceImpl *surface, DWORD location)
 273 {
 274     const struct wined3d_gl_info *gl_info = context->gl_info;
 275
 276     TRACE("Attach surface %p to %u\n", surface, idx);
 277
 278     if (surface)
 279     {
 280         switch (location)
 281         {
 282             case SFLAG_INTEXTURE:
 283                 surface_prepare_texture(surface, gl_info, FALSE);
 284                 context_apply_attachment_filter_states(surface, location);
 285                 gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_COLOR_ATTACHMENT0 + idx,
 286                         surface->texture_target, surface->texture_name, surface->texture_level);
 287                 break;
 288
 289             case SFLAG_INSRGBTEX:
 290                 surface_prepare_texture(surface, gl_info, TRUE);
 291                 context_apply_attachment_filter_states(surface, location);
 292                 gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_COLOR_ATTACHMENT0 + idx,
 293                         surface->texture_target, surface->texture_name_srgb, surface->texture_level);
 294                 break;
 295
 296             default:
 297                 ERR("Unsupported location %s (%#x).\n", debug_surflocation(location), location);
 298                 break;
 299         }
 300         checkGLcall("glFramebufferTexture2D()");
 301     }
 302     else
 303     {
 304         gl_info->fbo_ops.glFramebufferTexture2D(fbo_target, GL_COLOR_ATTACHMENT0 + idx, GL_TEXTURE_2D, 0, 0);
 305         checkGLcall("glFramebufferTexture2D()");
 306     }
 307 }
 308
 309 /* GL locking is done by the caller */
 310 static void context_check_fbo_status(struct wined3d_context *context, GLenum target)
 311 {
 312     const struct wined3d_gl_info *gl_info = context->gl_info;
 313     GLenum status;
 314
 315     status = gl_info->fbo_ops.glCheckFramebufferStatus(target);
 316     if (status == GL_FRAMEBUFFER_COMPLETE)
 317     {
 318         TRACE("FBO complete\n");
 319     } else {
 320         IWineD3DSurfaceImpl *attachment;
 321         unsigned int i;
 322         FIXME("FBO status %s (%#x)\n", debug_fbostatus(status), status);
 323
 324         if (!context->current_fbo)
 325         {
 326             ERR("FBO 0 is incomplete, driver bug?\n");
 327             return;
 328         }
 329
 330         FIXME("\tLocation %s (%#x).\n", debug_surflocation(context->current_fbo->location),
 331                 context->current_fbo->location);
 332
 333         /* Dump the FBO attachments */
 334         for (i = 0; i < gl_info->limits.buffers; ++i)
 335         {
 336             attachment = context->current_fbo->render_targets[i];
 337             if (attachment)
 338             {
 339                 FIXME("\tColor attachment %d: (%p) %s %ux%u\n",
 340                         i, attachment, debug_d3dformat(attachment->resource.format_desc->format),
 341                         attachment->pow2Width, attachment->pow2Height);
 342             }
 343         }
 344         attachment = context->current_fbo->depth_stencil;
 345         if (attachment)
 346         {
 347             FIXME("\tDepth attachment: (%p) %s %ux%u\n",
 348                     attachment, debug_d3dformat(attachment->resource.format_desc->format),
 349                     attachment->pow2Width, attachment->pow2Height);
 350         }
 351     }
 352 }
 353
 354 static struct fbo_entry *context_create_fbo_entry(struct wined3d_context *context,
 355         IWineD3DSurfaceImpl **render_targets, IWineD3DSurfaceImpl *depth_stencil, DWORD location)
 356 {
 357     const struct wined3d_gl_info *gl_info = context->gl_info;
 358     struct fbo_entry *entry;
 359
 360     entry = HeapAlloc(GetProcessHeap(), 0, sizeof(*entry));
 361     entry->render_targets = HeapAlloc(GetProcessHeap(), 0, gl_info->limits.buffers * sizeof(*entry->render_targets));
 362     memcpy(entry->render_targets, render_targets, gl_info->limits.buffers * sizeof(*entry->render_targets));
 363     entry->depth_stencil = depth_stencil;
 364     entry->location = location;
 365     entry->attached = FALSE;
 366     entry->id = 0;
 367
 368     return entry;
 369 }
 370
 371 /* GL locking is done by the caller */
 372 static void context_reuse_fbo_entry(struct wined3d_context *context, GLenum target,
 373         IWineD3DSurfaceImpl **render_targets, IWineD3DSurfaceImpl *depth_stencil,
 374         DWORD location, struct fbo_entry *entry)
 375 {
 376     const struct wined3d_gl_info *gl_info = context->gl_info;
 377
 378     context_bind_fbo(context, target, &entry->id);
 379     context_clean_fbo_attachments(gl_info, target);
 380
 381     memcpy(entry->render_targets, render_targets, gl_info->limits.buffers * sizeof(*entry->render_targets));
 382     entry->depth_stencil = depth_stencil;
 383     entry->location = location;
 384     entry->attached = FALSE;
 385 }
 386
 387 /* GL locking is done by the caller */
 388 static void context_destroy_fbo_entry(struct wined3d_context *context, struct fbo_entry *entry)
 389 {
 390     if (entry->id)
 391     {
 392         TRACE("Destroy FBO %d\n", entry->id);
 393         context_destroy_fbo(context, &entry->id);
 394     }
 395     --context->fbo_entry_count;
 396     list_remove(&entry->entry);
 397     HeapFree(GetProcessHeap(), 0, entry->render_targets);
 398     HeapFree(GetProcessHeap(), 0, entry);
 399 }
 400
 401
 402 /* GL locking is done by the caller */
 403 static struct fbo_entry *context_find_fbo_entry(struct wined3d_context *context, GLenum target,
 404         IWineD3DSurfaceImpl **render_targets, IWineD3DSurfaceImpl *depth_stencil, DWORD location)
 405 {
 406     const struct wined3d_gl_info *gl_info = context->gl_info;
 407     struct fbo_entry *entry;
 408
 409     LIST_FOR_EACH_ENTRY(entry, &context->fbo_list, struct fbo_entry, entry)
 410     {
 411         if (!memcmp(entry->render_targets,
 412                 render_targets, gl_info->limits.buffers * sizeof(*entry->render_targets))
 413                 && entry->depth_stencil == depth_stencil && entry->location == location)
 414         {
 415             list_remove(&entry->entry);
 416             list_add_head(&context->fbo_list, &entry->entry);
 417             return entry;
 418         }
 419     }
 420
 421     if (context->fbo_entry_count < WINED3D_MAX_FBO_ENTRIES)
 422     {
 423         entry = context_create_fbo_entry(context, render_targets, depth_stencil, location);
 424         list_add_head(&context->fbo_list, &entry->entry);
 425         ++context->fbo_entry_count;
 426     }
 427     else
 428     {
 429         entry = LIST_ENTRY(list_tail(&context->fbo_list), struct fbo_entry, entry);
 430         context_reuse_fbo_entry(context, target, render_targets, depth_stencil, location, entry);
 431         list_remove(&entry->entry);
 432         list_add_head(&context->fbo_list, &entry->entry);
 433     }
 434
 435     return entry;
 436 }
 437
 438 /* GL locking is done by the caller */
 439 static void context_apply_fbo_entry(struct wined3d_context *context, GLenum target, struct fbo_entry *entry)
 440 {
 441     const struct wined3d_gl_info *gl_info = context->gl_info;
 442     unsigned int i;
 443
 444     context_bind_fbo(context, target, &entry->id);
 445
 446     if (!entry->attached)
 447     {
 448         /* Apply render targets */
 449         for (i = 0; i < gl_info->limits.buffers; ++i)
 450         {
 451             context_attach_surface_fbo(context, target, i, entry->render_targets[i], entry->location);
 452         }
 453
 454         /* Apply depth targets */
 455         if (entry->depth_stencil)
 456         {
 457             surface_set_compatible_renderbuffer(entry->depth_stencil,
 458                     entry->render_targets[0]->pow2Width, entry->render_targets[0]->pow2Height);
 459         }
 460         context_attach_depth_stencil_fbo(context, target, entry->depth_stencil, TRUE);
 461
 462         entry->attached = TRUE;
 463     }
 464     else
 465     {
 466         for (i = 0; i < gl_info->limits.buffers; ++i)
 467         {
 468             if (entry->render_targets[i])
 469                 context_apply_attachment_filter_states(entry->render_targets[i], entry->location);
 470         }
 471         if (entry->depth_stencil)
 472             context_apply_attachment_filter_states(entry->depth_stencil, SFLAG_INTEXTURE);
 473     }
 474 }
 475
 476 /* GL locking is done by the caller */
 477 static void context_apply_fbo_state(struct wined3d_context *context, GLenum target,
 478         IWineD3DSurfaceImpl **render_targets, IWineD3DSurfaceImpl *depth_stencil, DWORD location)
 479 {
 480     struct fbo_entry *entry, *entry2;
 481
 482     LIST_FOR_EACH_ENTRY_SAFE(entry, entry2, &context->fbo_destroy_list, struct fbo_entry, entry)
 483     {
 484         context_destroy_fbo_entry(context, entry);
 485     }
 486
 487     if (context->rebind_fbo)
 488     {
 489         context_bind_fbo(context, GL_FRAMEBUFFER, NULL);
 490         context->rebind_fbo = FALSE;
 491     }
 492
 493     if (render_targets)
 494     {
 495         context->current_fbo = context_find_fbo_entry(context, target, render_targets, depth_stencil, location);
 496         context_apply_fbo_entry(context, target, context->current_fbo);
 497     }
 498     else
 499     {
 500         context->current_fbo = NULL;
 501         context_bind_fbo(context, target, NULL);
 502     }
 503
 504     context_check_fbo_status(context, target);
 505 }
 506
 507 /* GL locking is done by the caller */
 508 void context_apply_fbo_state_blit(struct wined3d_context *context, GLenum target,
 509         IWineD3DSurfaceImpl *render_target, IWineD3DSurfaceImpl *depth_stencil, DWORD location)
 510 {
 511     if (surface_is_offscreen(render_target))
 512     {
 513         UINT clear_size = (context->gl_info->limits.buffers - 1) * sizeof(*context->blit_targets);
 514         context->blit_targets[0] = render_target;
 515         if (clear_size) memset(&context->blit_targets[1], 0, clear_size);
 516         context_apply_fbo_state(context, target, context->blit_targets, depth_stencil, location);
 517     }
 518     else
 519     {
 520         context_apply_fbo_state(context, target, NULL, NULL, location);
 521     }
 522 }
 523
 524 /* Context activation is done by the caller. */
 525 void context_alloc_occlusion_query(struct wined3d_context *context, struct wined3d_occlusion_query *query)
 526 {
 527     const struct wined3d_gl_info *gl_info = context->gl_info;
 528
 529     if (context->free_occlusion_query_count)
 530     {
 531         query->id = context->free_occlusion_queries[--context->free_occlusion_query_count];
 532     }
 533     else
 534     {
 535         if (gl_info->supported[ARB_OCCLUSION_QUERY])
 536         {
 537             ENTER_GL();
 538             GL_EXTCALL(glGenQueriesARB(1, &query->id));
 539             checkGLcall("glGenQueriesARB");
 540             LEAVE_GL();
 541
 542             TRACE("Allocated occlusion query %u in context %p.\n", query->id, context);
 543         }
 544         else
 545         {
 546             WARN("Occlusion queries not supported, not allocating query id.\n");
 547             query->id = 0;
 548         }
 549     }
 550
 551     query->context = context;
 552     list_add_head(&context->occlusion_queries, &query->entry);
 553 }
 554
 555 void context_free_occlusion_query(struct wined3d_occlusion_query *query)
 556 {
 557     struct wined3d_context *context = query->context;
 558
 559     list_remove(&query->entry);
 560     query->context = NULL;
 561
 562     if (context->free_occlusion_query_count >= context->free_occlusion_query_size - 1)
 563     {
 564         UINT new_size = context->free_occlusion_query_size << 1;
 565         GLuint *new_data = HeapReAlloc(GetProcessHeap(), 0, context->free_occlusion_queries,
 566                 new_size * sizeof(*context->free_occlusion_queries));
 567
 568         if (!new_data)
 569         {
 570             ERR("Failed to grow free list, leaking query %u in context %p.\n", query->id, context);
 571             return;
 572         }
 573
 574         context->free_occlusion_query_size = new_size;
 575         context->free_occlusion_queries = new_data;
 576     }
 577
 578     context->free_occlusion_queries[context->free_occlusion_query_count++] = query->id;
 579 }
 580
 581 /* Context activation is done by the caller. */
 582 void context_alloc_event_query(struct wined3d_context *context, struct wined3d_event_query *query)
 583 {
 584     const struct wined3d_gl_info *gl_info = context->gl_info;
 585
 586     if (context->free_event_query_count)
 587     {
 588         query->object = context->free_event_queries[--context->free_event_query_count];
 589     }
 590     else
 591     {
 592         if (gl_info->supported[ARB_SYNC])
 593         {
 594             /* Using ARB_sync, not much to do here. */
 595             query->object.sync = NULL;
 596             TRACE("Allocated event query %p in context %p.\n", query->object.sync, context);
 597         }
 598         else if (gl_info->supported[APPLE_FENCE])
 599         {
 600             ENTER_GL();
 601             GL_EXTCALL(glGenFencesAPPLE(1, &query->object.id));
 602             checkGLcall("glGenFencesAPPLE");
 603             LEAVE_GL();
 604
 605             TRACE("Allocated event query %u in context %p.\n", query->object.id, context);
 606         }
 607         else if(gl_info->supported[NV_FENCE])
 608         {
 609             ENTER_GL();
 610             GL_EXTCALL(glGenFencesNV(1, &query->object.id));
 611             checkGLcall("glGenFencesNV");
 612             LEAVE_GL();
 613
 614             TRACE("Allocated event query %u in context %p.\n", query->object.id, context);
 615         }
 616         else
 617         {
 618             WARN("Event queries not supported, not allocating query id.\n");
 619             query->object.id = 0;
 620         }
 621     }
 622
 623     query->context = context;
 624     list_add_head(&context->event_queries, &query->entry);
 625 }
 626
 627 void context_free_event_query(struct wined3d_event_query *query)
 628 {
 629     struct wined3d_context *context = query->context;
 630
 631     list_remove(&query->entry);
 632     query->context = NULL;
 633
 634     if (context->free_event_query_count >= context->free_event_query_size - 1)
 635     {
 636         UINT new_size = context->free_event_query_size << 1;
 637         union wined3d_gl_query_object *new_data = HeapReAlloc(GetProcessHeap(), 0, context->free_event_queries,
 638                 new_size * sizeof(*context->free_event_queries));
 639
 640         if (!new_data)
 641         {
 642             ERR("Failed to grow free list, leaking query %u in context %p.\n", query->object.id, context);
 643             return;
 644         }
 645
 646         context->free_event_query_size = new_size;
 647         context->free_event_queries = new_data;
 648     }
 649
 650     context->free_event_queries[context->free_event_query_count++] = query->object;
 651 }
 652
 653 typedef void (context_fbo_entry_func_t)(struct wined3d_context *context, struct fbo_entry *entry);
 654
 655 static void context_enum_surface_fbo_entries(IWineD3DDeviceImpl *device,
 656         IWineD3DSurfaceImpl *surface, context_fbo_entry_func_t *callback)
 657 {
 658     UINT i;
 659
 660     for (i = 0; i < device->numContexts; ++i)
 661     {
 662         struct wined3d_context *context = device->contexts[i];
 663         const struct wined3d_gl_info *gl_info = context->gl_info;
 664         struct fbo_entry *entry, *entry2;
 665
 666         if (context->current_rt == surface) context->current_rt = NULL;
 667
 668         LIST_FOR_EACH_ENTRY_SAFE(entry, entry2, &context->fbo_list, struct fbo_entry, entry)
 669         {
 670             UINT j;
 671
 672             if (entry->depth_stencil == surface)
 673             {
 674                 callback(context, entry);
 675                 continue;
 676             }
 677
 678             for (j = 0; j < gl_info->limits.buffers; ++j)
 679             {
 680                 if (entry->render_targets[j] == surface)
 681                 {
 682                     callback(context, entry);
 683                     break;
 684                 }
 685             }
 686         }
 687     }
 688 }
 689
 690 static void context_queue_fbo_entry_destruction(struct wined3d_context *context, struct fbo_entry *entry)
 691 {
 692     list_remove(&entry->entry);
 693     list_add_head(&context->fbo_destroy_list, &entry->entry);
 694 }
 695
 696 void context_resource_released(IWineD3DDeviceImpl *device, IWineD3DResource *resource, WINED3DRESOURCETYPE type)
 697 {
 698     if (!device->d3d_initialized) return;
 699
 700     switch (type)
 701     {
 702         case WINED3DRTYPE_SURFACE:
 703             context_enum_surface_fbo_entries(device, (IWineD3DSurfaceImpl *)resource,
 704                     context_queue_fbo_entry_destruction);
 705             break;
 706
 707         default:
 708             break;
 709     }
 710 }
 711
 712 static void context_detach_fbo_entry(struct wined3d_context *context, struct fbo_entry *entry)
 713 {
 714     entry->attached = FALSE;
 715 }
 716
 717 void context_resource_unloaded(IWineD3DDeviceImpl *device, IWineD3DResource *resource, WINED3DRESOURCETYPE type)
 718 {
 719     switch (type)
 720     {
 721         case WINED3DRTYPE_SURFACE:
 722             context_enum_surface_fbo_entries(device, (IWineD3DSurfaceImpl *)resource,
 723                     context_detach_fbo_entry);
 724             break;
 725
 726         default:
 727             break;
 728     }
 729 }
 730
 731 void context_surface_update(struct wined3d_context *context, IWineD3DSurfaceImpl *surface)
 732 {
 733     const struct wined3d_gl_info *gl_info = context->gl_info;
 734     struct fbo_entry *entry = context->current_fbo;
 735     unsigned int i;
 736
 737     if (!entry || context->rebind_fbo) return;
 738
 739     for (i = 0; i < gl_info->limits.buffers; ++i)
 740     {
 741         if (surface == entry->render_targets[i])
 742         {
 743             TRACE("Updated surface %p is bound as color attachment %u to the current FBO.\n", surface, i);
 744             context->rebind_fbo = TRUE;
 745             return;
 746         }
 747     }
 748
 749     if (surface == entry->depth_stencil)
 750     {
 751         TRACE("Updated surface %p is bound as depth attachment to the current FBO.\n", surface);
 752         context->rebind_fbo = TRUE;
 753     }
 754 }
 755
 756 static BOOL context_set_pixel_format(const struct wined3d_gl_info *gl_info, HDC dc, int format)
 757 {
 758     int current = GetPixelFormat(dc);
 759
 760     if (current == format) return TRUE;
 761
 762     if (!current)
 763     {
 764         if (!SetPixelFormat(dc, format, NULL))
 765         {
 766             ERR("Failed to set pixel format %d on device context %p, last error %#x.\n",
 767                     format, dc, GetLastError());
 768             return FALSE;
 769         }
 770         return TRUE;
 771     }
 772
 773     /* By default WGL doesn't allow pixel format adjustments but we need it
 774      * here. For this reason there's a Wine specific wglSetPixelFormat()
 775      * which allows us to set the pixel format multiple times. Only use it
 776      * when really needed. */
 777     if (gl_info->supported[WGL_WINE_PIXEL_FORMAT_PASSTHROUGH])
 778     {
 779         if (!GL_EXTCALL(wglSetPixelFormatWINE(dc, format, NULL)))
 780         {
 781             ERR("wglSetPixelFormatWINE failed to set pixel format %d on device context %p.\n",
 782                     format, dc);
 783             return FALSE;
 784         }
 785         return TRUE;
 786     }
 787
 788     /* OpenGL doesn't allow pixel format adjustments. Print an error and
 789      * continue using the old format. There's a big chance that the old
 790      * format works although with a performance hit and perhaps rendering
 791      * errors. */
 792     ERR("Unable to set pixel format %d on device context %p. Already using format %d.\n",
 793             format, dc, current);
 794     return TRUE;
 795 }
 796
 797 static void context_update_window(struct wined3d_context *context)
 798 {
 799     TRACE("Updating context %p window from %p to %p.\n",
 800             context, context->win_handle, context->swapchain->win_handle);
 801
 802     if (context->valid)
 803     {
 804         if (!ReleaseDC(context->win_handle, context->hdc))
 805         {
 806             ERR("Failed to release device context %p, last error %#x.\n",
 807                     context->hdc, GetLastError());
 808         }
 809     }
 810     else context->valid = 1;
 811
 812     context->win_handle = context->swapchain->win_handle;
 813
 814     if (!(context->hdc = GetDC(context->win_handle)))
 815     {
 816         ERR("Failed to get a device context for window %p.\n", context->win_handle);
 817         goto err;
 818     }
 819
 820     if (!context_set_pixel_format(context->gl_info, context->hdc, context->pixel_format))
 821     {
 822         ERR("Failed to set pixel format %d on device context %p.\n",
 823                 context->pixel_format, context->hdc);
 824         goto err;
 825     }
 826
 827     if (!pwglMakeCurrent(context->hdc, context->glCtx))
 828     {
 829         ERR("Failed to make GL context %p current on device context %p, last error %#x.\n",
 830                 context->glCtx, context->hdc, GetLastError());
 831         goto err;
 832     }
 833
 834     return;
 835
 836 err:
 837     context->valid = 0;
 838 }
 839
 840 static void context_validate(struct wined3d_context *context)
 841 {
 842     HWND wnd = WindowFromDC(context->hdc);
 843
 844     if (wnd != context->win_handle)
 845     {
 846         WARN("DC %p belongs to window %p instead of %p.\n",
 847                 context->hdc, wnd, context->win_handle);
 848         context->valid = 0;
 849     }
 850
 851     if (context->win_handle != context->swapchain->win_handle)
 852         context_update_window(context);
 853 }
 854
 855 static void context_destroy_gl_resources(struct wined3d_context *context)
 856 {
 857     const struct wined3d_gl_info *gl_info = context->gl_info;
 858     struct wined3d_occlusion_query *occlusion_query;
 859     struct wined3d_event_query *event_query;
 860     struct fbo_entry *entry, *entry2;
 861     HGLRC restore_ctx;
 862     HDC restore_dc;
 863     unsigned int i;
 864
 865     restore_ctx = pwglGetCurrentContext();
 866     restore_dc = pwglGetCurrentDC();
 867
 868     context_validate(context);
 869     if (context->valid && restore_ctx != context->glCtx) pwglMakeCurrent(context->hdc, context->glCtx);
 870     else restore_ctx = NULL;
 871
 872     ENTER_GL();
 873
 874     LIST_FOR_EACH_ENTRY(occlusion_query, &context->occlusion_queries, struct wined3d_occlusion_query, entry)
 875     {
 876         if (context->valid && gl_info->supported[ARB_OCCLUSION_QUERY])
 877             GL_EXTCALL(glDeleteQueriesARB(1, &occlusion_query->id));
 878         occlusion_query->context = NULL;
 879     }
 880
 881     LIST_FOR_EACH_ENTRY(event_query, &context->event_queries, struct wined3d_event_query, entry)
 882     {
 883         if (context->valid)
 884         {
 885             if (gl_info->supported[ARB_SYNC])
 886             {
 887                 if (event_query->object.sync) GL_EXTCALL(glDeleteSync(event_query->object.sync));
 888             }
 889             else if (gl_info->supported[APPLE_FENCE]) GL_EXTCALL(glDeleteFencesAPPLE(1, &event_query->object.id));
 890             else if (gl_info->supported[NV_FENCE]) GL_EXTCALL(glDeleteFencesNV(1, &event_query->object.id));
 891         }
 892         event_query->context = NULL;
 893     }
 894
 895     LIST_FOR_EACH_ENTRY_SAFE(entry, entry2, &context->fbo_destroy_list, struct fbo_entry, entry)
 896     {
 897         if (!context->valid) entry->id = 0;
 898         context_destroy_fbo_entry(context, entry);
 899     }
 900
 901     LIST_FOR_EACH_ENTRY_SAFE(entry, entry2, &context->fbo_list, struct fbo_entry, entry)
 902     {
 903         if (!context->valid) entry->id = 0;
 904         context_destroy_fbo_entry(context, entry);
 905     }
 906
 907     if (context->valid)
 908     {
 909         if (context->dst_fbo)
 910         {
 911             TRACE("Destroy dst FBO %d\n", context->dst_fbo);
 912             context_destroy_fbo(context, &context->dst_fbo);
 913         }
 914         if (context->dummy_arbfp_prog)
 915         {
 916             GL_EXTCALL(glDeleteProgramsARB(1, &context->dummy_arbfp_prog));
 917         }
 918
 919         if (gl_info->supported[ARB_OCCLUSION_QUERY])
 920             GL_EXTCALL(glDeleteQueriesARB(context->free_occlusion_query_count, context->free_occlusion_queries));
 921
 922         if (gl_info->supported[ARB_SYNC])
 923         {
 924             if (event_query->object.sync) GL_EXTCALL(glDeleteSync(event_query->object.sync));
 925         }
 926         else if (gl_info->supported[APPLE_FENCE])
 927         {
 928             for (i = 0; i < context->free_event_query_count; ++i)
 929             {
 930                 GL_EXTCALL(glDeleteFencesAPPLE(1, &context->free_event_queries[i].id));
 931             }
 932         }
 933         else if (gl_info->supported[NV_FENCE])
 934         {
 935             for (i = 0; i < context->free_event_query_count; ++i)
 936             {
 937                 GL_EXTCALL(glDeleteFencesNV(1, &context->free_event_queries[i].id));
 938             }
 939         }
 940
 941         checkGLcall("context cleanup");
 942     }
 943
 944     LEAVE_GL();
 945
 946     HeapFree(GetProcessHeap(), 0, context->free_occlusion_queries);
 947     HeapFree(GetProcessHeap(), 0, context->free_event_queries);
 948
 949     if (restore_ctx)
 950     {
 951         if (!pwglMakeCurrent(restore_dc, restore_ctx))
 952         {
 953             DWORD err = GetLastError();
 954             ERR("Failed to restore GL context %p on device context %p, last error %#x.\n",
 955                     restore_ctx, restore_dc, err);
 956         }
 957     }
 958     else if (pwglGetCurrentContext() && !pwglMakeCurrent(NULL, NULL))
 959     {
 960         ERR("Failed to disable GL context.\n");
 961     }
 962
 963     ReleaseDC(context->win_handle, context->hdc);
 964
 965     if (!pwglDeleteContext(context->glCtx))
 966     {
 967         DWORD err = GetLastError();
 968         ERR("wglDeleteContext(%p) failed, last error %#x.\n", context->glCtx, err);
 969     }
 970 }
 971
 972 DWORD context_get_tls_idx(void)
 973 {
 974     return wined3d_context_tls_idx;
 975 }
 976
 977 void context_set_tls_idx(DWORD idx)
 978 {
 979     wined3d_context_tls_idx = idx;
 980 }
 981
 982 struct wined3d_context *context_get_current(void)
 983 {
 984     return TlsGetValue(wined3d_context_tls_idx);
 985 }
 986
 987 BOOL context_set_current(struct wined3d_context *ctx)
 988 {
 989     struct wined3d_context *old = context_get_current();
 990
 991     if (old == ctx)
 992     {
 993         TRACE("Already using D3D context %p.\n", ctx);
 994         return TRUE;
 995     }
 996
 997     if (old)
 998     {
 999         if (old->destroyed)
1000         {
1001             TRACE("Switching away from destroyed context %p.\n", old);
1002             context_destroy_gl_resources(old);
1003             HeapFree(GetProcessHeap(), 0, old);
1004         }
1005         else
1006         {
1007             old->current = 0;
1008         }
1009     }
1010
1011     if (ctx)
1012     {
1013         TRACE("Switching to D3D context %p, GL context %p, device context %p.\n", ctx, ctx->glCtx, ctx->hdc);
1014         if (!pwglMakeCurrent(ctx->hdc, ctx->glCtx))
1015         {
1016             DWORD err = GetLastError();
1017             ERR("Failed to make GL context %p current on device context %p, last error %#x.\n",
1018                     ctx->glCtx, ctx->hdc, err);
1019             TlsSetValue(wined3d_context_tls_idx, NULL);
1020             return FALSE;
1021         }
1022         ctx->current = 1;
1023     }
1024     else if(pwglGetCurrentContext())
1025     {
1026         TRACE("Clearing current D3D context.\n");
1027         if (!pwglMakeCurrent(NULL, NULL))
1028         {
1029             DWORD err = GetLastError();
1030             ERR("Failed to clear current GL context, last error %#x.\n", err);
1031             TlsSetValue(wined3d_context_tls_idx, NULL);
1032             return FALSE;
1033         }
1034     }
1035
1036     return TlsSetValue(wined3d_context_tls_idx, ctx);
1037 }
1038
1039 void context_release(struct wined3d_context *context)
1040 {
1041     TRACE("Releasing context %p, level %u.\n", context, context->level);
1042
1043     if (WARN_ON(d3d))
1044     {
1045         if (!context->level)
1046             WARN("Context %p is not active.\n", context);
1047         else if (context != context_get_current())
1048             WARN("Context %p is not the current context.\n", context);
1049     }
1050
1051     if (!--context->level && context->restore_ctx)
1052     {
1053         TRACE("Restoring GL context %p on device context %p.\n", context->restore_ctx, context->restore_dc);
1054         if (!pwglMakeCurrent(context->restore_dc, context->restore_ctx))
1055         {
1056             DWORD err = GetLastError();
1057             ERR("Failed to restore GL context %p on device context %p, last error %#x.\n",
1058                     context->restore_ctx, context->restore_dc, err);
1059         }
1060         context->restore_ctx = NULL;
1061         context->restore_dc = NULL;
1062     }
1063 }
1064
1065 static void context_enter(struct wined3d_context *context)
1066 {
1067     TRACE("Entering context %p, level %u.\n", context, context->level + 1);
1068
1069     if (!context->level++)
1070     {
1071         const struct wined3d_context *current_context = context_get_current();
1072         HGLRC current_gl = pwglGetCurrentContext();
1073
1074         if (current_gl && (!current_context || current_context->glCtx != current_gl))
1075         {
1076             TRACE("Another GL context (%p on device context %p) is already current.\n",
1077                     current_gl, pwglGetCurrentDC());
1078             context->restore_ctx = current_gl;
1079             context->restore_dc = pwglGetCurrentDC();
1080         }
1081     }
1082 }
1083
1084 /*****************************************************************************
1085  * Context_MarkStateDirty
1086  *
1087  * Marks a state in a context dirty. Only one context, opposed to
1088  * IWineD3DDeviceImpl_MarkStateDirty, which marks the state dirty in all
1089  * contexts
1090  *
1091  * Params:
1092  *  context: Context to mark the state dirty in
1093  *  state: State to mark dirty
1094  *  StateTable: Pointer to the state table in use(for state grouping)
1095  *
1096  *****************************************************************************/
1097 static void Context_MarkStateDirty(struct wined3d_context *context, DWORD state, const struct StateEntry *StateTable)
1098 {
1099     DWORD rep = StateTable[state].representative;
1100     DWORD idx;
1101     BYTE shift;
1102
1103     if (isStateDirty(context, rep)) return;
1104
1105     context->dirtyArray[context->numDirtyEntries++] = rep;
1106     idx = rep / (sizeof(*context->isStateDirty) * CHAR_BIT);
1107     shift = rep & ((sizeof(*context->isStateDirty) * CHAR_BIT) - 1);
1108     context->isStateDirty[idx] |= (1 << shift);
1109 }
1110
1111 /* This function takes care of WineD3D pixel format selection. */
1112 static int WineD3D_ChoosePixelFormat(IWineD3DDeviceImpl *This, HDC hdc,
1113         const struct wined3d_format_desc *color_format_desc, const struct wined3d_format_desc *ds_format_desc,
1114         BOOL auxBuffers, int numSamples, BOOL findCompatible)
1115 {
1116     int iPixelFormat=0;
1117     unsigned int matchtry;
1118     short redBits, greenBits, blueBits, alphaBits, colorBits;
1119     short depthBits=0, stencilBits=0;
1120
1121     struct match_type {
1122         BOOL require_aux;
1123         BOOL exact_alpha;
1124         BOOL exact_color;
1125     } matches[] = {
1126         /* First, try without alpha match buffers. MacOS supports aux buffers only
1127          * on A8R8G8B8, and we prefer better offscreen rendering over an alpha match.
1128          * Then try without aux buffers - this is the most common cause for not
1129          * finding a pixel format. Also some drivers(the open source ones)
1130          * only offer 32 bit ARB pixel formats. First try without an exact alpha
1131          * match, then try without an exact alpha and color match.
1132          */
1133         { TRUE,  TRUE,  TRUE  },
1134         { TRUE,  FALSE, TRUE  },
1135         { FALSE, TRUE,  TRUE  },
1136         { FALSE, FALSE, TRUE  },
1137         { TRUE,  FALSE, FALSE },
1138         { FALSE, FALSE, FALSE },
1139     };
1140
1141     int i = 0;
1142     int nCfgs = This->adapter->nCfgs;
1143
1144     TRACE("ColorFormat=%s, DepthStencilFormat=%s, auxBuffers=%d, numSamples=%d, findCompatible=%d\n",
1145           debug_d3dformat(color_format_desc->format), debug_d3dformat(ds_format_desc->format),
1146           auxBuffers, numSamples, findCompatible);
1147
1148     if (!getColorBits(color_format_desc, &redBits, &greenBits, &blueBits, &alphaBits, &colorBits))
1149     {
1150         ERR("Unable to get color bits for format %s (%#x)!\n",
1151                 debug_d3dformat(color_format_desc->format), color_format_desc->format);
1152         return 0;
1153     }
1154
1155     getDepthStencilBits(ds_format_desc, &depthBits, &stencilBits);
1156
1157     for(matchtry = 0; matchtry < (sizeof(matches) / sizeof(matches[0])) && !iPixelFormat; matchtry++) {
1158         for(i=0; i<nCfgs; i++) {
1159             BOOL exactDepthMatch = TRUE;
1160             WineD3D_PixelFormat *cfg = &This->adapter->cfgs[i];
1161
1162             /* For now only accept RGBA formats. Perhaps some day we will
1163              * allow floating point formats for pbuffers. */
1164             if(cfg->iPixelType != WGL_TYPE_RGBA_ARB)
1165                 continue;
1166
1167             /* In window mode we need a window drawable format and double buffering. */
1168             if(!(cfg->windowDrawable && cfg->doubleBuffer))
1169                 continue;
1170
1171             /* We like to have aux buffers in backbuffer mode */
1172             if(auxBuffers && !cfg->auxBuffers && matches[matchtry].require_aux)
1173                 continue;
1174
1175             if(matches[matchtry].exact_color) {
1176                 if(cfg->redSize != redBits)
1177                     continue;
1178                 if(cfg->greenSize != greenBits)
1179                     continue;
1180                 if(cfg->blueSize != blueBits)
1181                     continue;
1182             } else {
1183                 if(cfg->redSize < redBits)
1184                     continue;
1185                 if(cfg->greenSize < greenBits)
1186                     continue;
1187                 if(cfg->blueSize < blueBits)
1188                     continue;
1189             }
1190             if(matches[matchtry].exact_alpha) {
1191                 if(cfg->alphaSize != alphaBits)
1192                     continue;
1193             } else {
1194                 if(cfg->alphaSize < alphaBits)
1195                     continue;
1196             }
1197
1198             /* We try to locate a format which matches our requirements exactly. In case of
1199              * depth it is no problem to emulate 16-bit using e.g. 24-bit, so accept that. */
1200             if(cfg->depthSize < depthBits)
1201                 continue;
1202             else if(cfg->depthSize > depthBits)
1203                 exactDepthMatch = FALSE;
1204
1205             /* In all cases make sure the number of stencil bits matches our requirements
1206              * even when we don't need stencil because it could affect performance EXCEPT
1207              * on cards which don't offer depth formats without stencil like the i915 drivers
1208              * on Linux. */
1209             if(stencilBits != cfg->stencilSize && !(This->adapter->brokenStencil && stencilBits <= cfg->stencilSize))
1210                 continue;
1211
1212             /* Check multisampling support */
1213             if(cfg->numSamples != numSamples)
1214                 continue;
1215
1216             /* When we have passed all the checks then we have found a format which matches our
1217              * requirements. Note that we only check for a limit number of capabilities right now,
1218              * so there can easily be a dozen of pixel formats which appear to be the 'same' but
1219              * can still differ in things like multisampling, stereo, SRGB and other flags.
1220              */
1221
1222             /* Exit the loop as we have found a format :) */
1223             if(exactDepthMatch) {
1224                 iPixelFormat = cfg->iPixelFormat;
1225                 break;
1226             } else if(!iPixelFormat) {
1227                 /* In the end we might end up with a format which doesn't exactly match our depth
1228                  * requirements. Accept the first format we found because formats with higher iPixelFormat
1229                  * values tend to have more extended capabilities (e.g. multisampling) which we don't need. */
1230                 iPixelFormat = cfg->iPixelFormat;
1231             }
1232         }
1233     }
1234
1235     /* When findCompatible is set and no suitable format was found, let ChoosePixelFormat choose a pixel format in order not to crash. */
1236     if(!iPixelFormat && !findCompatible) {
1237         ERR("Can't find a suitable iPixelFormat\n");
1238         return FALSE;
1239     } else if(!iPixelFormat) {
1240         PIXELFORMATDESCRIPTOR pfd;
1241
1242         TRACE("Falling back to ChoosePixelFormat as we weren't able to find an exactly matching pixel format\n");
1243         /* PixelFormat selection */
1244         ZeroMemory(&pfd, sizeof(pfd));
1245         pfd.nSize      = sizeof(pfd);
1246         pfd.nVersion   = 1;
1247         pfd.dwFlags    = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW;/*PFD_GENERIC_ACCELERATED*/
1248         pfd.iPixelType = PFD_TYPE_RGBA;
1249         pfd.cAlphaBits = alphaBits;
1250         pfd.cColorBits = colorBits;
1251         pfd.cDepthBits = depthBits;
1252         pfd.cStencilBits = stencilBits;
1253         pfd.iLayerType = PFD_MAIN_PLANE;
1254
1255         iPixelFormat = ChoosePixelFormat(hdc, &pfd);
1256         if(!iPixelFormat) {
1257             /* If this happens something is very wrong as ChoosePixelFormat barely fails */
1258             ERR("Can't find a suitable iPixelFormat\n");
1259             return FALSE;
1260         }
1261     }
1262
1263     TRACE("Found iPixelFormat=%d for ColorFormat=%s, DepthStencilFormat=%s\n",
1264             iPixelFormat, debug_d3dformat(color_format_desc->format), debug_d3dformat(ds_format_desc->format));
1265     return iPixelFormat;
1266 }
1267
1268 /*****************************************************************************
1269  * context_create
1270  *
1271  * Creates a new context.
1272  *
1273  * * Params:
1274  *  This: Device to activate the context for
1275  *  target: Surface this context will render to
1276  *  win_handle: handle to the window which we are drawing to
1277  *  pPresentParameters: contains the pixelformats to use for onscreen rendering
1278  *
1279  *****************************************************************************/
1280 struct wined3d_context *context_create(IWineD3DSwapChainImpl *swapchain, IWineD3DSurfaceImpl *target,
1281         const struct wined3d_format_desc *ds_format_desc)
1282 {
1283     IWineD3DDeviceImpl *device = swapchain->device;
1284     const struct wined3d_gl_info *gl_info = &device->adapter->gl_info;
1285     const struct wined3d_format_desc *color_format_desc;
1286     struct wined3d_context *ret;
1287     PIXELFORMATDESCRIPTOR pfd;
1288     BOOL auxBuffers = FALSE;
1289     int numSamples = 0;
1290     int pixel_format;
1291     unsigned int s;
1292     DWORD state;
1293     HGLRC ctx;
1294     HDC hdc;
1295
1296     TRACE("swapchain %p, target %p, window %p.\n", swapchain, target, swapchain->win_handle);
1297
1298     ret = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*ret));
1299     if (!ret)
1300     {
1301         ERR("Failed to allocate context memory.\n");
1302         return NULL;
1303     }
1304
1305     if (!(hdc = GetDC(swapchain->win_handle)))
1306     {
1307         ERR("Failed to retrieve a device context.\n");
1308         goto out;
1309     }
1310
1311     color_format_desc = target->resource.format_desc;
1312
1313     /* In case of ORM_BACKBUFFER, make sure to request an alpha component for
1314      * X4R4G4B4/X8R8G8B8 as we might need it for the backbuffer. */
1315     if (wined3d_settings.offscreen_rendering_mode == ORM_BACKBUFFER)
1316     {
1317         auxBuffers = TRUE;
1318
1319         if (color_format_desc->format == WINED3DFMT_B4G4R4X4_UNORM)
1320             color_format_desc = getFormatDescEntry(WINED3DFMT_B4G4R4A4_UNORM, gl_info);
1321         else if (color_format_desc->format == WINED3DFMT_B8G8R8X8_UNORM)
1322             color_format_desc = getFormatDescEntry(WINED3DFMT_B8G8R8A8_UNORM, gl_info);
1323     }
1324
1325     /* DirectDraw supports 8bit paletted render targets and these are used by
1326      * old games like Starcraft and C&C. Most modern hardware doesn't support
1327      * 8bit natively so we perform some form of 8bit -> 32bit conversion. The
1328      * conversion (ab)uses the alpha component for storing the palette index.
1329      * For this reason we require a format with 8bit alpha, so request
1330      * A8R8G8B8. */
1331     if (color_format_desc->format == WINED3DFMT_P8_UINT)
1332         color_format_desc = getFormatDescEntry(WINED3DFMT_B8G8R8A8_UNORM, gl_info);
1333
1334     /* D3D only allows multisampling when SwapEffect is set to WINED3DSWAPEFFECT_DISCARD. */
1335     if (swapchain->presentParms.MultiSampleType && (swapchain->presentParms.SwapEffect == WINED3DSWAPEFFECT_DISCARD))
1336     {
1337         if (!gl_info->supported[ARB_MULTISAMPLE])
1338             WARN("The application is requesting multisampling without support.\n");
1339         else
1340         {
1341             TRACE("Requesting multisample type %#x.\n", swapchain->presentParms.MultiSampleType);
1342             numSamples = swapchain->presentParms.MultiSampleType;
1343         }
1344     }
1345
1346     /* Try to find a pixel format which matches our requirements. */
1347     pixel_format = WineD3D_ChoosePixelFormat(device, hdc, color_format_desc, ds_format_desc,
1348             auxBuffers, numSamples, FALSE /* findCompatible */);
1349
1350     /* Try to locate a compatible format if we weren't able to find anything. */
1351     if (!pixel_format)
1352     {
1353         TRACE("Trying to locate a compatible pixel format because an exact match failed.\n");
1354         pixel_format = WineD3D_ChoosePixelFormat(device, hdc, color_format_desc, ds_format_desc,
1355                 auxBuffers, 0 /* numSamples */, TRUE /* findCompatible */);
1356     }
1357
1358     /* If we still don't have a pixel format, something is very wrong as ChoosePixelFormat barely fails */
1359     if (!pixel_format)
1360     {
1361         ERR("Can't find a suitable pixel format.\n");
1362         goto out;
1363     }
1364
1365     DescribePixelFormat(hdc, pixel_format, sizeof(pfd), &pfd);
1366     if (!context_set_pixel_format(gl_info, hdc, pixel_format))
1367     {
1368         ERR("Failed to set pixel format %d on device context %p.\n", pixel_format, hdc);
1369         goto out;
1370     }
1371
1372     ctx = pwglCreateContext(hdc);
1373     if (device->numContexts)
1374     {
1375         if (!pwglShareLists(device->contexts[0]->glCtx, ctx))
1376         {
1377             DWORD err = GetLastError();
1378             ERR("wglShareLists(%p, %p) failed, last error %#x.\n",
1379                     device->contexts[0]->glCtx, ctx, err);
1380         }
1381     }
1382
1383     if(!ctx) {
1384         ERR("Failed to create a WGL context\n");
1385         goto out;
1386     }
1387
1388     if (!device_context_add(device, ret))
1389     {
1390         ERR("Failed to add the newly created context to the context list\n");
1391         if (!pwglDeleteContext(ctx))
1392         {
1393             DWORD err = GetLastError();
1394             ERR("wglDeleteContext(%p) failed, last error %#x.\n", ctx, err);
1395         }
1396         goto out;
1397     }
1398
1399     ret->gl_info = gl_info;
1400
1401     /* Mark all states dirty to force a proper initialization of the states
1402      * on the first use of the context. */
1403     for (state = 0; state <= STATE_HIGHEST; ++state)
1404     {
1405         if (device->StateTable[state].representative)
1406             Context_MarkStateDirty(ret, state, device->StateTable);
1407     }
1408
1409     ret->swapchain = swapchain;
1410     ret->current_rt = target;
1411     ret->tid = GetCurrentThreadId();
1412
1413     ret->render_offscreen = surface_is_offscreen(target);
1414     ret->draw_buffer_dirty = TRUE;
1415     ret->valid = 1;
1416
1417     ret->glCtx = ctx;
1418     ret->win_handle = swapchain->win_handle;
1419     ret->hdc = hdc;
1420     ret->pixel_format = pixel_format;
1421
1422     if (device->shader_backend->shader_dirtifyable_constants((IWineD3DDevice *)device))
1423     {
1424         /* Create the dirty constants array and initialize them to dirty */
1425         ret->vshader_const_dirty = HeapAlloc(GetProcessHeap(), 0,
1426                 sizeof(*ret->vshader_const_dirty) * device->d3d_vshader_constantF);
1427         ret->pshader_const_dirty = HeapAlloc(GetProcessHeap(), 0,
1428                 sizeof(*ret->pshader_const_dirty) * device->d3d_pshader_constantF);
1429         memset(ret->vshader_const_dirty, 1,
1430                sizeof(*ret->vshader_const_dirty) * device->d3d_vshader_constantF);
1431         memset(ret->pshader_const_dirty, 1,
1432                 sizeof(*ret->pshader_const_dirty) * device->d3d_pshader_constantF);
1433     }
1434
1435     ret->blit_targets = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
1436             gl_info->limits.buffers * sizeof(*ret->blit_targets));
1437     if (!ret->blit_targets) goto out;
1438
1439     ret->draw_buffers = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
1440             gl_info->limits.buffers * sizeof(*ret->draw_buffers));
1441     if (!ret->draw_buffers) goto out;
1442
1443     ret->free_occlusion_query_size = 4;
1444     ret->free_occlusion_queries = HeapAlloc(GetProcessHeap(), 0,
1445             ret->free_occlusion_query_size * sizeof(*ret->free_occlusion_queries));
1446     if (!ret->free_occlusion_queries) goto out;
1447
1448     list_init(&ret->occlusion_queries);
1449
1450     ret->free_event_query_size = 4;
1451     ret->free_event_queries = HeapAlloc(GetProcessHeap(), 0,
1452             ret->free_event_query_size * sizeof(*ret->free_event_queries));
1453     if (!ret->free_event_queries) goto out;
1454
1455     list_init(&ret->event_queries);
1456
1457     TRACE("Successfully created new context %p\n", ret);
1458
1459     list_init(&ret->fbo_list);
1460     list_init(&ret->fbo_destroy_list);
1461
1462     context_enter(ret);
1463
1464     /* Set up the context defaults */
1465     if (!context_set_current(ret))
1466     {
1467         ERR("Cannot activate context to set up defaults\n");
1468         context_release(ret);
1469         goto out;
1470     }
1471
1472     ENTER_GL();
1473
1474     glGetIntegerv(GL_AUX_BUFFERS, &ret->aux_buffers);
1475
1476     TRACE("Setting up the screen\n");
1477     /* Clear the screen */
1478     glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
1479     checkGLcall("glClearColor");
1480     glClearIndex(0);
1481     glClearDepth(1);
1482     glClearStencil(0xffff);
1483
1484     checkGLcall("glClear");
1485
1486     glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
1487     checkGLcall("glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);");
1488
1489     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
1490     checkGLcall("glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);");
1491
1492     glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
1493     checkGLcall("glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);");
1494
1495     glPixelStorei(GL_PACK_ALIGNMENT, device->surface_alignment);
1496     checkGLcall("glPixelStorei(GL_PACK_ALIGNMENT, device->surface_alignment);");
1497     glPixelStorei(GL_UNPACK_ALIGNMENT, device->surface_alignment);
1498     checkGLcall("glPixelStorei(GL_UNPACK_ALIGNMENT, device->surface_alignment);");
1499
1500     if (gl_info->supported[APPLE_CLIENT_STORAGE])
1501     {
1502         /* Most textures will use client storage if supported. Exceptions are non-native power of 2 textures
1503          * and textures in DIB sections(due to the memory protection).
1504          */
1505         glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
1506         checkGLcall("glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE)");
1507     }
1508     if (gl_info->supported[ARB_VERTEX_BLEND])
1509     {
1510         /* Direct3D always uses n-1 weights for n world matrices and uses 1 - sum for the last one
1511          * this is equal to GL_WEIGHT_SUM_UNITY_ARB. Enabling it doesn't do anything unless
1512          * GL_VERTEX_BLEND_ARB isn't enabled too
1513          */
1514         glEnable(GL_WEIGHT_SUM_UNITY_ARB);
1515         checkGLcall("glEnable(GL_WEIGHT_SUM_UNITY_ARB)");
1516     }
1517     if (gl_info->supported[NV_TEXTURE_SHADER2])
1518     {
1519         /* Set up the previous texture input for all shader units. This applies to bump mapping, and in d3d
1520          * the previous texture where to source the offset from is always unit - 1.
1521          */
1522         for (s = 1; s < gl_info->limits.textures; ++s)
1523         {
1524             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
1525             glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + s - 1);
1526             checkGLcall("glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, ...");
1527         }
1528     }
1529     if (gl_info->supported[ARB_FRAGMENT_PROGRAM])
1530     {
1531         /* MacOS(radeon X1600 at least, but most likely others too) refuses to draw if GLSL and ARBFP are
1532          * enabled, but the currently bound arbfp program is 0. Enabling ARBFP with prog 0 is invalid, but
1533          * GLSL should bypass this. This causes problems in programs that never use the fixed function pipeline,
1534          * because the ARBFP extension is enabled by the ARBFP pipeline at context creation, but no program
1535          * is ever assigned.
1536          *
1537          * So make sure a program is assigned to each context. The first real ARBFP use will set a different
1538          * program and the dummy program is destroyed when the context is destroyed.
1539          */
1540         const char *dummy_program =
1541                 "!!ARBfp1.0\n"
1542                 "MOV result.color, fragment.color.primary;\n"
1543                 "END\n";
1544         GL_EXTCALL(glGenProgramsARB(1, &ret->dummy_arbfp_prog));
1545         GL_EXTCALL(glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, ret->dummy_arbfp_prog));
1546         GL_EXTCALL(glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, strlen(dummy_program), dummy_program));
1547     }
1548
1549     for (s = 0; s < gl_info->limits.point_sprite_units; ++s)
1550     {
1551         GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
1552         glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
1553         checkGLcall("glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE)");
1554     }
1555
1556     if (gl_info->supported[WINED3D_GL_VERSION_2_0])
1557     {
1558         /* Windows doesn't support to query the glPointParameteri function pointer, so use the
1559          * NV_POINT_SPRITE extension.
1560          */
1561         if (glPointParameteri)
1562         {
1563             glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT);
1564             checkGLcall("glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT)");
1565         }
1566         else if (gl_info->supported[NV_POINT_SPRITE])
1567         {
1568             GL_EXTCALL(glPointParameteriNV(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT));
1569             checkGLcall("glPointParameteriNV(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT)");
1570         }
1571     }
1572
1573     if (gl_info->supported[ARB_PROVOKING_VERTEX])
1574     {
1575         GL_EXTCALL(glProvokingVertex(GL_FIRST_VERTEX_CONVENTION));
1576     }
1577     else if (gl_info->supported[EXT_PROVOKING_VERTEX])
1578     {
1579         GL_EXTCALL(glProvokingVertexEXT(GL_FIRST_VERTEX_CONVENTION_EXT));
1580     }
1581
1582     LEAVE_GL();
1583
1584     device->frag_pipe->enable_extension((IWineD3DDevice *)device, TRUE);
1585
1586     TRACE("Created context %p.\n", ret);
1587
1588     return ret;
1589
1590 out:
1591     HeapFree(GetProcessHeap(), 0, ret->free_event_queries);
1592     HeapFree(GetProcessHeap(), 0, ret->free_occlusion_queries);
1593     HeapFree(GetProcessHeap(), 0, ret->draw_buffers);
1594     HeapFree(GetProcessHeap(), 0, ret->blit_targets);
1595     HeapFree(GetProcessHeap(), 0, ret->pshader_const_dirty);
1596     HeapFree(GetProcessHeap(), 0, ret->vshader_const_dirty);
1597     HeapFree(GetProcessHeap(), 0, ret);
1598     return NULL;
1599 }
1600
1601 /*****************************************************************************
1602  * context_destroy
1603  *
1604  * Destroys a wined3d context
1605  *
1606  * Params:
1607  *  This: Device to activate the context for
1608  *  context: Context to destroy
1609  *
1610  *****************************************************************************/
1611 void context_destroy(IWineD3DDeviceImpl *This, struct wined3d_context *context)
1612 {
1613     BOOL destroy;
1614
1615     TRACE("Destroying ctx %p\n", context);
1616
1617     if (context->tid == GetCurrentThreadId() || !context->current)
1618     {
1619         context_destroy_gl_resources(context);
1620         TlsSetValue(wined3d_context_tls_idx, NULL);
1621         destroy = TRUE;
1622     }
1623     else
1624     {
1625         context->destroyed = 1;
1626         destroy = FALSE;
1627     }
1628
1629     HeapFree(GetProcessHeap(), 0, context->draw_buffers);
1630     HeapFree(GetProcessHeap(), 0, context->blit_targets);
1631     HeapFree(GetProcessHeap(), 0, context->vshader_const_dirty);
1632     HeapFree(GetProcessHeap(), 0, context->pshader_const_dirty);
1633     device_context_remove(This, context);
1634     if (destroy) HeapFree(GetProcessHeap(), 0, context);
1635 }
1636
1637 /* GL locking is done by the caller */
1638 static inline void set_blit_dimension(UINT width, UINT height) {
1639     glMatrixMode(GL_PROJECTION);
1640     checkGLcall("glMatrixMode(GL_PROJECTION)");
1641     glLoadIdentity();
1642     checkGLcall("glLoadIdentity()");
1643     glOrtho(0, width, height, 0, 0.0, -1.0);
1644     checkGLcall("glOrtho");
1645     glViewport(0, 0, width, height);
1646     checkGLcall("glViewport");
1647 }
1648
1649 /*****************************************************************************
1650  * SetupForBlit
1651  *
1652  * Sets up a context for DirectDraw blitting.
1653  * All texture units are disabled, texture unit 0 is set as current unit
1654  * fog, lighting, blending, alpha test, z test, scissor test, culling disabled
1655  * color writing enabled for all channels
1656  * register combiners disabled, shaders disabled
1657  * world matrix is set to identity, texture matrix 0 too
1658  * projection matrix is setup for drawing screen coordinates
1659  *
1660  * Params:
1661  *  This: Device to activate the context for
1662  *  context: Context to setup
1663  *
1664  *****************************************************************************/
1665 /* Context activation is done by the caller. */
1666 static void SetupForBlit(IWineD3DDeviceImpl *This, struct wined3d_context *context)
1667 {
1668     int i;
1669     const struct StateEntry *StateTable = This->StateTable;
1670     const struct wined3d_gl_info *gl_info = context->gl_info;
1671     UINT width = context->current_rt->currentDesc.Width;
1672     UINT height = context->current_rt->currentDesc.Height;
1673     DWORD sampler;
1674
1675     TRACE("Setting up context %p for blitting\n", context);
1676     if(context->last_was_blit) {
1677         if(context->blit_w != width || context->blit_h != height) {
1678             ENTER_GL();
1679             set_blit_dimension(width, height);
1680             LEAVE_GL();
1681             context->blit_w = width; context->blit_h = height;
1682             /* No need to dirtify here, the states are still dirtified because they weren't
1683              * applied since the last SetupForBlit call. Otherwise last_was_blit would not
1684              * be set
1685              */
1686         }
1687         TRACE("Context is already set up for blitting, nothing to do\n");
1688         return;
1689     }
1690     context->last_was_blit = TRUE;
1691
1692     /* TODO: Use a display list */
1693
1694     /* Disable shaders */
1695     ENTER_GL();
1696     This->shader_backend->shader_select(context, FALSE, FALSE);
1697     LEAVE_GL();
1698
1699     Context_MarkStateDirty(context, STATE_VSHADER, StateTable);
1700     Context_MarkStateDirty(context, STATE_PIXELSHADER, StateTable);
1701
1702     /* Call ENTER_GL() once for all gl calls below. In theory we should not call
1703      * helper functions in between gl calls. This function is full of Context_MarkStateDirty
1704      * which can safely be called from here, we only lock once instead locking/unlocking
1705      * after each GL call.
1706      */
1707     ENTER_GL();
1708
1709     /* Disable all textures. The caller can then bind a texture it wants to blit
1710      * from
1711      *
1712      * The blitting code uses (for now) the fixed function pipeline, so make sure to reset all fixed
1713      * function texture unit. No need to care for higher samplers
1714      */
1715     for (i = gl_info->limits.textures - 1; i > 0 ; --i)
1716     {
1717         sampler = This->rev_tex_unit_map[i];
1718         GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + i));
1719         checkGLcall("glActiveTextureARB");
1720
1721         if (gl_info->supported[ARB_TEXTURE_CUBE_MAP])
1722         {
1723             glDisable(GL_TEXTURE_CUBE_MAP_ARB);
1724             checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
1725         }
1726         glDisable(GL_TEXTURE_3D);
1727         checkGLcall("glDisable GL_TEXTURE_3D");
1728         if (gl_info->supported[ARB_TEXTURE_RECTANGLE])
1729         {
1730             glDisable(GL_TEXTURE_RECTANGLE_ARB);
1731             checkGLcall("glDisable GL_TEXTURE_RECTANGLE_ARB");
1732         }
1733         glDisable(GL_TEXTURE_2D);
1734         checkGLcall("glDisable GL_TEXTURE_2D");
1735
1736         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
1737         checkGLcall("glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);");
1738
1739         if (sampler != WINED3D_UNMAPPED_STAGE)
1740         {
1741             if (sampler < MAX_TEXTURES) {
1742                 Context_MarkStateDirty(context, STATE_TEXTURESTAGE(sampler, WINED3DTSS_COLOROP), StateTable);
1743             }
1744             Context_MarkStateDirty(context, STATE_SAMPLER(sampler), StateTable);
1745         }
1746     }
1747     GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB));
1748     checkGLcall("glActiveTextureARB");
1749
1750     sampler = This->rev_tex_unit_map[0];
1751
1752     if (gl_info->supported[ARB_TEXTURE_CUBE_MAP])
1753     {
1754         glDisable(GL_TEXTURE_CUBE_MAP_ARB);
1755         checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
1756     }
1757     glDisable(GL_TEXTURE_3D);
1758     checkGLcall("glDisable GL_TEXTURE_3D");
1759     if (gl_info->supported[ARB_TEXTURE_RECTANGLE])
1760     {
1761         glDisable(GL_TEXTURE_RECTANGLE_ARB);
1762         checkGLcall("glDisable GL_TEXTURE_RECTANGLE_ARB");
1763     }
1764     glDisable(GL_TEXTURE_2D);
1765     checkGLcall("glDisable GL_TEXTURE_2D");
1766
1767     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
1768
1769     glMatrixMode(GL_TEXTURE);
1770     checkGLcall("glMatrixMode(GL_TEXTURE)");
1771     glLoadIdentity();
1772     checkGLcall("glLoadIdentity()");
1773
1774     if (gl_info->supported[EXT_TEXTURE_LOD_BIAS])
1775     {
1776         glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT,
1777                   GL_TEXTURE_LOD_BIAS_EXT,
1778                   0.0f);
1779         checkGLcall("glTexEnvi GL_TEXTURE_LOD_BIAS_EXT ...");
1780     }
1781
1782     if (sampler != WINED3D_UNMAPPED_STAGE)
1783     {
1784         if (sampler < MAX_TEXTURES) {
1785             Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_TEXTURE0 + sampler), StateTable);
1786             Context_MarkStateDirty(context, STATE_TEXTURESTAGE(sampler, WINED3DTSS_COLOROP), StateTable);
1787         }
1788         Context_MarkStateDirty(context, STATE_SAMPLER(sampler), StateTable);
1789     }
1790
1791     /* Other misc states */
1792     glDisable(GL_ALPHA_TEST);
1793     checkGLcall("glDisable(GL_ALPHA_TEST)");
1794     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHATESTENABLE), StateTable);
1795     glDisable(GL_LIGHTING);
1796     checkGLcall("glDisable GL_LIGHTING");
1797     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_LIGHTING), StateTable);
1798     glDisable(GL_DEPTH_TEST);
1799     checkGLcall("glDisable GL_DEPTH_TEST");
1800     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ZENABLE), StateTable);
1801     glDisableWINE(GL_FOG);
1802     checkGLcall("glDisable GL_FOG");
1803     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_FOGENABLE), StateTable);
1804     glDisable(GL_BLEND);
1805     checkGLcall("glDisable GL_BLEND");
1806     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
1807     glDisable(GL_CULL_FACE);
1808     checkGLcall("glDisable GL_CULL_FACE");
1809     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CULLMODE), StateTable);
1810     glDisable(GL_STENCIL_TEST);
1811     checkGLcall("glDisable GL_STENCIL_TEST");
1812     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_STENCILENABLE), StateTable);
1813     glDisable(GL_SCISSOR_TEST);
1814     checkGLcall("glDisable GL_SCISSOR_TEST");
1815     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
1816     if (gl_info->supported[ARB_POINT_SPRITE])
1817     {
1818         glDisable(GL_POINT_SPRITE_ARB);
1819         checkGLcall("glDisable GL_POINT_SPRITE_ARB");
1820         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_POINTSPRITEENABLE), StateTable);
1821     }
1822     glColorMask(GL_TRUE, GL_TRUE,GL_TRUE,GL_TRUE);
1823     checkGLcall("glColorMask");
1824     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_COLORWRITEENABLE), StateTable);
1825     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_COLORWRITEENABLE1), StateTable);
1826     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_COLORWRITEENABLE2), StateTable);
1827     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_COLORWRITEENABLE3), StateTable);
1828     if (gl_info->supported[EXT_SECONDARY_COLOR])
1829     {
1830         glDisable(GL_COLOR_SUM_EXT);
1831         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
1832         checkGLcall("glDisable(GL_COLOR_SUM_EXT)");
1833     }
1834
1835     /* Setup transforms */
1836     glMatrixMode(GL_MODELVIEW);
1837     checkGLcall("glMatrixMode(GL_MODELVIEW)");
1838     glLoadIdentity();
1839     checkGLcall("glLoadIdentity()");
1840     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_WORLDMATRIX(0)), StateTable);
1841
1842     context->last_was_rhw = TRUE;
1843     Context_MarkStateDirty(context, STATE_VDECL, StateTable); /* because of last_was_rhw = TRUE */
1844
1845     glDisable(GL_CLIP_PLANE0); checkGLcall("glDisable(clip plane 0)");
1846     glDisable(GL_CLIP_PLANE1); checkGLcall("glDisable(clip plane 1)");
1847     glDisable(GL_CLIP_PLANE2); checkGLcall("glDisable(clip plane 2)");
1848     glDisable(GL_CLIP_PLANE3); checkGLcall("glDisable(clip plane 3)");
1849     glDisable(GL_CLIP_PLANE4); checkGLcall("glDisable(clip plane 4)");
1850     glDisable(GL_CLIP_PLANE5); checkGLcall("glDisable(clip plane 5)");
1851     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
1852
1853     set_blit_dimension(width, height);
1854
1855     LEAVE_GL();
1856
1857     context->blit_w = width; context->blit_h = height;
1858     Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
1859     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_PROJECTION), StateTable);
1860
1861
1862     This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
1863 }
1864
1865 /*****************************************************************************
1866  * findThreadContextForSwapChain
1867  *
1868  * Searches a swapchain for all contexts and picks one for the thread tid.
1869  * If none can be found the swapchain is requested to create a new context
1870  *
1871  *****************************************************************************/
1872 static struct wined3d_context *findThreadContextForSwapChain(IWineD3DSwapChain *swapchain, DWORD tid)
1873 {
1874     unsigned int i;
1875
1876     for(i = 0; i < ((IWineD3DSwapChainImpl *) swapchain)->num_contexts; i++) {
1877         if(((IWineD3DSwapChainImpl *) swapchain)->context[i]->tid == tid) {
1878             return ((IWineD3DSwapChainImpl *) swapchain)->context[i];
1879         }
1880
1881     }
1882
1883     /* Create a new context for the thread */
1884     return swapchain_create_context_for_thread(swapchain);
1885 }
1886
1887 /*****************************************************************************
1888  * FindContext
1889  *
1890  * Finds a context for the current render target and thread
1891  *
1892  * Parameters:
1893  *  target: Render target to find the context for
1894  *  tid: Thread to activate the context for
1895  *
1896  * Returns: The needed context
1897  *
1898  *****************************************************************************/
1899 static struct wined3d_context *FindContext(IWineD3DDeviceImpl *This, IWineD3DSurfaceImpl *target)
1900 {
1901     IWineD3DSwapChain *swapchain = NULL;
1902     struct wined3d_context *current_context = context_get_current();
1903     DWORD tid = GetCurrentThreadId();
1904     struct wined3d_context *context;
1905
1906     if (current_context && current_context->destroyed) current_context = NULL;
1907
1908     if (!target)
1909     {
1910         if (current_context
1911                 && current_context->current_rt
1912                 && current_context->swapchain->device == This)
1913         {
1914             target = current_context->current_rt;
1915         }
1916         else
1917         {
1918             IWineD3DSwapChainImpl *swapchain = (IWineD3DSwapChainImpl *)This->swapchains[0];
1919             if (swapchain->back_buffers) target = swapchain->back_buffers[0];
1920             else target = swapchain->front_buffer;
1921         }
1922     }
1923
1924     if (current_context && current_context->current_rt == target)
1925     {
1926         context_validate(current_context);
1927         return current_context;
1928     }
1929
1930     if (target->Flags & SFLAG_SWAPCHAIN)
1931     {
1932         TRACE("Rendering onscreen\n");
1933
1934         swapchain = (IWineD3DSwapChain *)target->container;
1935         context = findThreadContextForSwapChain(swapchain, tid);
1936     }
1937     else
1938     {
1939         TRACE("Rendering offscreen\n");
1940
1941         /* Stay with the currently active context. */
1942         if (current_context && current_context->swapchain->device == This)
1943         {
1944             context = current_context;
1945         }
1946         else
1947         {
1948             /* This may happen if the app jumps straight into offscreen rendering
1949              * Start using the context of the primary swapchain. tid == 0 is no problem
1950              * for findThreadContextForSwapChain.
1951              *
1952              * Can also happen on thread switches - in that case findThreadContextForSwapChain
1953              * is perfect to call. */
1954             context = findThreadContextForSwapChain(This->swapchains[0], tid);
1955         }
1956     }
1957
1958     context_validate(context);
1959
1960     return context;
1961 }
1962
1963 /* Context activation is done by the caller. */
1964 static void context_apply_draw_buffer(struct wined3d_context *context, BOOL blit)
1965 {
1966     const struct wined3d_gl_info *gl_info = context->gl_info;
1967     IWineD3DSurfaceImpl *rt = context->current_rt;
1968     IWineD3DDeviceImpl *device;
1969
1970     device = rt->resource.device;
1971     if (!surface_is_offscreen(rt))
1972     {
1973         ENTER_GL();
1974         glDrawBuffer(surface_get_gl_buffer(rt));
1975         checkGLcall("glDrawBuffers()");
1976         LEAVE_GL();
1977     }
1978     else
1979     {
1980         ENTER_GL();
1981         if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
1982         {
1983             if (!blit)
1984             {
1985                 unsigned int i;
1986
1987                 for (i = 0; i < gl_info->limits.buffers; ++i)
1988                 {
1989                     if (device->render_targets[i])
1990                         context->draw_buffers[i] = GL_COLOR_ATTACHMENT0 + i;
1991                     else
1992                         context->draw_buffers[i] = GL_NONE;
1993                 }
1994
1995                 if (gl_info->supported[ARB_DRAW_BUFFERS])
1996                 {
1997                     GL_EXTCALL(glDrawBuffersARB(gl_info->limits.buffers, context->draw_buffers));
1998                     checkGLcall("glDrawBuffers()");
1999                 }
2000                 else
2001                 {
2002                     glDrawBuffer(context->draw_buffers[0]);
2003                     checkGLcall("glDrawBuffer()");
2004                 }
2005             } else {
2006                 glDrawBuffer(GL_COLOR_ATTACHMENT0);
2007                 checkGLcall("glDrawBuffer()");
2008             }
2009         }
2010         else
2011         {
2012             glDrawBuffer(device->offscreenBuffer);
2013             checkGLcall("glDrawBuffer()");
2014         }
2015         LEAVE_GL();
2016     }
2017 }
2018
2019 /* GL locking is done by the caller. */
2020 void context_set_draw_buffer(struct wined3d_context *context, GLenum buffer)
2021 {
2022     glDrawBuffer(buffer);
2023     checkGLcall("glDrawBuffer()");
2024     context->draw_buffer_dirty = TRUE;
2025 }
2026
2027 static inline void context_set_render_offscreen(struct wined3d_context *context, const struct StateEntry *StateTable,
2028         BOOL offscreen)
2029 {
2030     const struct wined3d_gl_info *gl_info = context->gl_info;
2031
2032     if (context->render_offscreen == offscreen) return;
2033
2034     if (gl_info->supported[WINED3D_GL_VERSION_2_0])
2035     {
2036         /* Windows doesn't support to query the glPointParameteri function pointer, so use the
2037          * NV_POINT_SPRITE extension.
2038          */
2039         if (glPointParameteri)
2040         {
2041             glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, offscreen ? GL_LOWER_LEFT : GL_UPPER_LEFT);
2042             checkGLcall("glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, ...)");
2043         }
2044         else if (gl_info->supported[NV_POINT_SPRITE])
2045         {
2046             GL_EXTCALL(glPointParameteriNV(GL_POINT_SPRITE_COORD_ORIGIN, offscreen ? GL_LOWER_LEFT : GL_UPPER_LEFT));
2047             checkGLcall("glPointParameteriNV(GL_POINT_SPRITE_COORD_ORIGIN, ...)");
2048         }
2049     }
2050
2051     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_PROJECTION), StateTable);
2052     Context_MarkStateDirty(context, STATE_VDECL, StateTable);
2053     Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
2054     Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
2055     Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
2056     context->render_offscreen = offscreen;
2057 }
2058
2059 static BOOL match_depth_stencil_format(const struct wined3d_format_desc *existing,
2060         const struct wined3d_format_desc *required)
2061 {
2062     short existing_depth, existing_stencil, required_depth, required_stencil;
2063
2064     if(existing == required) return TRUE;
2065     if((existing->Flags & WINED3DFMT_FLAG_FLOAT) != (required->Flags & WINED3DFMT_FLAG_FLOAT)) return FALSE;
2066
2067     getDepthStencilBits(existing, &existing_depth, &existing_stencil);
2068     getDepthStencilBits(required, &required_depth, &required_stencil);
2069
2070     if(existing_depth < required_depth) return FALSE;
2071     /* If stencil bits are used the exact amount is required - otherwise wrapping
2072      * won't work correctly */
2073     if(required_stencil && required_stencil != existing_stencil) return FALSE;
2074     return TRUE;
2075 }
2076 /* The caller provides a context */
2077 static void context_validate_onscreen_formats(IWineD3DDeviceImpl *device,
2078         struct wined3d_context *context, IWineD3DSurfaceImpl *depth_stencil)
2079 {
2080     /* Onscreen surfaces are always in a swapchain */
2081     IWineD3DSwapChainImpl *swapchain = (IWineD3DSwapChainImpl *)context->current_rt->container;
2082
2083     if (context->render_offscreen || !depth_stencil) return;
2084     if (match_depth_stencil_format(swapchain->ds_format, depth_stencil->resource.format_desc)) return;
2085
2086     /* TODO: If the requested format would satisfy the needs of the existing one(reverse match),
2087      * or no onscreen depth buffer was created, the OpenGL drawable could be changed to the new
2088      * format. */
2089     WARN("Depth stencil format is not supported by WGL, rendering the backbuffer in an FBO\n");
2090
2091     /* The currently active context is the necessary context to access the swapchain's onscreen buffers */
2092     surface_load_location(context->current_rt, SFLAG_INTEXTURE, NULL);
2093     swapchain->render_to_fbo = TRUE;
2094     context_set_render_offscreen(context, device->StateTable, TRUE);
2095 }
2096
2097 /* Context activation is done by the caller. */
2098 void context_apply_blit_state(struct wined3d_context *context, IWineD3DDeviceImpl *device)
2099 {
2100     if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
2101     {
2102         context_validate_onscreen_formats(device, context, NULL);
2103
2104         if (context->render_offscreen)
2105         {
2106             FIXME("Applying blit state for an offscreen target with ORM_FBO. This should be avoided.\n");
2107             surface_internal_preload(context->current_rt, SRGB_RGB);
2108
2109             ENTER_GL();
2110             context_apply_fbo_state_blit(context, GL_FRAMEBUFFER, context->current_rt, NULL, SFLAG_INTEXTURE);
2111             LEAVE_GL();
2112         }
2113         else
2114         {
2115             ENTER_GL();
2116             context_bind_fbo(context, GL_FRAMEBUFFER, NULL);
2117             LEAVE_GL();
2118         }
2119
2120         context->draw_buffer_dirty = TRUE;
2121     }
2122
2123     if (context->draw_buffer_dirty)
2124     {
2125         context_apply_draw_buffer(context, TRUE);
2126         if (wined3d_settings.offscreen_rendering_mode != ORM_FBO)
2127             context->draw_buffer_dirty = FALSE;
2128     }
2129
2130     SetupForBlit(device, context);
2131 }
2132
2133 /* Context activation is done by the caller. */
2134 void context_apply_clear_state(struct wined3d_context *context, IWineD3DDeviceImpl *device,
2135         UINT rt_count, IWineD3DSurfaceImpl **rts, IWineD3DSurfaceImpl *depth_stencil)
2136 {
2137     const struct StateEntry *state_table = device->StateTable;
2138     UINT i;
2139
2140     if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
2141     {
2142         context_validate_onscreen_formats(device, context, depth_stencil);
2143
2144         ENTER_GL();
2145
2146         if (surface_is_offscreen(rts[0]))
2147         {
2148             for (i = 0; i < rt_count; ++i)
2149             {
2150                 context->blit_targets[i] = rts[i];
2151             }
2152             while (i < context->gl_info->limits.buffers)
2153             {
2154                 context->blit_targets[i] = NULL;
2155                 ++i;
2156             }
2157             context_apply_fbo_state(context, GL_FRAMEBUFFER, context->blit_targets, depth_stencil, SFLAG_INTEXTURE);
2158         }
2159         else
2160         {
2161             context_apply_fbo_state(context, GL_FRAMEBUFFER, NULL, NULL, SFLAG_INDRAWABLE);
2162         }
2163
2164         LEAVE_GL();
2165     }
2166
2167     if (!surface_is_offscreen(rts[0]))
2168     {
2169         ENTER_GL();
2170         context_set_draw_buffer(context, surface_get_gl_buffer(rts[0]));
2171         LEAVE_GL();
2172     }
2173     else
2174     {
2175         const struct wined3d_gl_info *gl_info = context->gl_info;
2176
2177         for (i = 0; i < gl_info->limits.buffers; ++i)
2178         {
2179             if (i < rt_count && rts[i])
2180                 context->draw_buffers[i] = GL_COLOR_ATTACHMENT0 + i;
2181             else
2182                 context->draw_buffers[i] = GL_NONE;
2183         }
2184
2185         ENTER_GL();
2186         GL_EXTCALL(glDrawBuffersARB(gl_info->limits.buffers, context->draw_buffers));
2187         checkGLcall("glDrawBuffers()");
2188         LEAVE_GL();
2189
2190         context->draw_buffer_dirty = TRUE;
2191     }
2192
2193     if (context->last_was_blit)
2194     {
2195         device->frag_pipe->enable_extension((IWineD3DDevice *)device, TRUE);
2196     }
2197
2198     /* Blending and clearing should be orthogonal, but tests on the nvidia
2199      * driver show that disabling blending when clearing improves the clearing
2200      * performance incredibly. */
2201     ENTER_GL();
2202     glDisable(GL_BLEND);
2203     glEnable(GL_SCISSOR_TEST);
2204     checkGLcall("glEnable GL_SCISSOR_TEST");
2205     LEAVE_GL();
2206
2207     context->last_was_blit = FALSE;
2208     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), state_table);
2209     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), state_table);
2210     Context_MarkStateDirty(context, STATE_SCISSORRECT, state_table);
2211 }
2212
2213 /* Context activation is done by the caller. */
2214 void context_apply_draw_state(struct wined3d_context *context, IWineD3DDeviceImpl *device)
2215 {
2216     const struct StateEntry *state_table = device->StateTable;
2217     unsigned int i;
2218
2219     /* Preload resources before FBO setup. Texture preload in particular may
2220      * result in changes to the current FBO, due to using e.g. FBO blits for
2221      * updating a resource location. */
2222     IWineD3DDeviceImpl_FindTexUnitMap(device);
2223     device_preload_textures(device);
2224     if (isStateDirty(context, STATE_VDECL))
2225         device_update_stream_info(device, context->gl_info);
2226
2227     if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
2228     {
2229         context_validate_onscreen_formats(device, context, device->depth_stencil);
2230
2231         if (!context->render_offscreen)
2232         {
2233             ENTER_GL();
2234             context_apply_fbo_state(context, GL_FRAMEBUFFER, NULL, NULL, SFLAG_INDRAWABLE);
2235             LEAVE_GL();
2236         }
2237         else
2238         {
2239             ENTER_GL();
2240             context_apply_fbo_state(context, GL_FRAMEBUFFER, device->render_targets,
2241                     device->depth_stencil, SFLAG_INTEXTURE);
2242             LEAVE_GL();
2243         }
2244     }
2245
2246     if (context->draw_buffer_dirty)
2247     {
2248         context_apply_draw_buffer(context, FALSE);
2249         context->draw_buffer_dirty = FALSE;
2250     }
2251
2252     if (context->last_was_blit)
2253     {
2254         device->frag_pipe->enable_extension((IWineD3DDevice *)device, TRUE);
2255     }
2256
2257     ENTER_GL();
2258     for (i = 0; i < context->numDirtyEntries; ++i)
2259     {
2260         DWORD rep = context->dirtyArray[i];
2261         DWORD idx = rep / (sizeof(*context->isStateDirty) * CHAR_BIT);
2262         BYTE shift = rep & ((sizeof(*context->isStateDirty) * CHAR_BIT) - 1);
2263         context->isStateDirty[idx] &= ~(1 << shift);
2264         state_table[rep].apply(rep, device->stateBlock, context);
2265     }
2266     LEAVE_GL();
2267     context->numDirtyEntries = 0; /* This makes the whole list clean */
2268     context->last_was_blit = FALSE;
2269 }
2270
2271 static void context_setup_target(IWineD3DDeviceImpl *device,
2272         struct wined3d_context *context, IWineD3DSurfaceImpl *target)
2273 {
2274     BOOL old_render_offscreen = context->render_offscreen, render_offscreen;
2275     const struct StateEntry *StateTable = device->StateTable;
2276
2277     if (!target) return;
2278     render_offscreen = surface_is_offscreen(target);
2279     if (context->current_rt == target && render_offscreen == old_render_offscreen) return;
2280
2281     /* To compensate the lack of format switching with some offscreen rendering methods and on onscreen buffers
2282      * the alpha blend state changes with different render target formats. */
2283     if (!context->current_rt)
2284     {
2285         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
2286     }
2287     else
2288     {
2289         const struct wined3d_format_desc *old = context->current_rt->resource.format_desc;
2290         const struct wined3d_format_desc *new = target->resource.format_desc;
2291
2292         if (old->format != new->format)
2293         {
2294             /* Disable blending when the alpha mask has changed and when a format doesn't support blending. */
2295             if ((old->alpha_mask && !new->alpha_mask) || (!old->alpha_mask && new->alpha_mask)
2296                     || !(new->Flags & WINED3DFMT_FLAG_POSTPIXELSHADER_BLENDING))
2297             {
2298                 Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
2299             }
2300             /* Update sRGB writing when switching between formats that do/do not support sRGB writing */
2301             if ((old->Flags & WINED3DFMT_FLAG_SRGB_WRITE) != (new->Flags & WINED3DFMT_FLAG_SRGB_WRITE))
2302             {
2303                 Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SRGBWRITEENABLE), StateTable);
2304             }
2305         }
2306
2307         /* When switching away from an offscreen render target, and we're not
2308          * using FBOs, we have to read the drawable into the texture. This is
2309          * done via PreLoad (and SFLAG_INDRAWABLE set on the surface). There
2310          * are some things that need care though. PreLoad needs a GL context,
2311          * and FindContext is called before the context is activated. It also
2312          * has to be called with the old rendertarget active, otherwise a
2313          * wrong drawable is read. */
2314         if (wined3d_settings.offscreen_rendering_mode != ORM_FBO
2315                 && old_render_offscreen && context->current_rt != target)
2316         {
2317             BOOL oldInDraw = device->isInDraw;
2318
2319             /* surface_internal_preload() requires a context to load the
2320              * texture, so it will call context_acquire(). Set isInDraw to true
2321              * to signal surface_internal_preload() that it has a context. */
2322
2323             /* FIXME: This is just broken. There's no guarantee whatsoever
2324              * that the currently active context, if any, is appropriate for
2325              * reading back the render target. We should probably call
2326              * context_set_current(context) here and then rely on
2327              * context_acquire() doing the right thing. */
2328             device->isInDraw = TRUE;
2329
2330             /* Read the back buffer of the old drawable into the destination texture. */
2331             if (context->current_rt->texture_name_srgb)
2332             {
2333                 surface_internal_preload(context->current_rt, SRGB_BOTH);
2334             }
2335             else
2336             {
2337                 surface_internal_preload(context->current_rt, SRGB_RGB);
2338             }
2339
2340             surface_modify_location(context->current_rt, SFLAG_INDRAWABLE, FALSE);
2341
2342             device->isInDraw = oldInDraw;
2343         }
2344     }
2345
2346     context->draw_buffer_dirty = TRUE;
2347     context->current_rt = target;
2348     context_set_render_offscreen(context, StateTable, render_offscreen);
2349 }
2350
2351 /*****************************************************************************
2352  * context_acquire
2353  *
2354  * Finds a rendering context and drawable matching the device and render
2355  * target for the current thread, activates them and puts them into the
2356  * requested state.
2357  *
2358  * Params:
2359  *  This: Device to activate the context for
2360  *  target: Requested render target
2361  *  usage: Prepares the context for blitting, drawing or other actions
2362  *
2363  *****************************************************************************/
2364 struct wined3d_context *context_acquire(IWineD3DDeviceImpl *device, IWineD3DSurfaceImpl *target)
2365 {
2366     struct wined3d_context *current_context = context_get_current();
2367     struct wined3d_context *context;
2368
2369     TRACE("device %p, target %p.\n", device, target);
2370
2371     context = FindContext(device, target);
2372     context_setup_target(device, context, target);
2373     context_enter(context);
2374     if (!context->valid) return context;
2375
2376     if (context != current_context)
2377     {
2378         if (!context_set_current(context)) ERR("Failed to activate the new context.\n");
2379         else device->frag_pipe->enable_extension((IWineD3DDevice *)device, !context->last_was_blit);
2380
2381         if (context->vshader_const_dirty)
2382         {
2383             memset(context->vshader_const_dirty, 1,
2384                     sizeof(*context->vshader_const_dirty) * device->d3d_vshader_constantF);
2385             device->highest_dirty_vs_const = device->d3d_vshader_constantF;
2386         }
2387         if (context->pshader_const_dirty)
2388         {
2389             memset(context->pshader_const_dirty, 1,
2390                    sizeof(*context->pshader_const_dirty) * device->d3d_pshader_constantF);
2391             device->highest_dirty_ps_const = device->d3d_pshader_constantF;
2392         }
2393     }
2394     else if (context->restore_ctx)
2395     {
2396         if (!pwglMakeCurrent(context->hdc, context->glCtx))
2397         {
2398             DWORD err = GetLastError();
2399             ERR("Failed to make GL context %p current on device context %p, last error %#x.\n",
2400                     context->hdc, context->glCtx, err);
2401         }
2402     }
2403
2404     return context;
2405 }