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  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include <stdio.h>
  23 #ifdef HAVE_FLOAT_H
  24 # include <float.h>
  25 #endif
  26 #include "wined3d_private.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(d3d);
  29
  30 #define GLINFO_LOCATION This->adapter->gl_info
  31
  32 /*****************************************************************************
  33  * Context_MarkStateDirty
  34  *
  35  * Marks a state in a context dirty. Only one context, opposed to
  36  * IWineD3DDeviceImpl_MarkStateDirty, which marks the state dirty in all
  37  * contexts
  38  *
  39  * Params:
  40  *  context: Context to mark the state dirty in
  41  *  state: State to mark dirty
  42  *  StateTable: Pointer to the state table in use(for state grouping)
  43  *
  44  *****************************************************************************/
  45 static void Context_MarkStateDirty(WineD3DContext *context, DWORD state, const struct StateEntry *StateTable) {
  46     DWORD rep = StateTable[state].representative;
  47     DWORD idx;
  48     BYTE shift;
  49
  50     if(!rep || isStateDirty(context, rep)) return;
  51
  52     context->dirtyArray[context->numDirtyEntries++] = rep;
  53     idx = rep >> 5;
  54     shift = rep & 0x1f;
  55     context->isStateDirty[idx] |= (1 << shift);
  56 }
  57
  58 /*****************************************************************************
  59  * AddContextToArray
  60  *
  61  * Adds a context to the context array. Helper function for CreateContext
  62  *
  63  * This method is not called in performance-critical code paths, only when a
  64  * new render target or swapchain is created. Thus performance is not an issue
  65  * here.
  66  *
  67  * Params:
  68  *  This: Device to add the context for
  69  *  hdc: device context
  70  *  glCtx: WGL context to add
  71  *  pbuffer: optional pbuffer used with this context
  72  *
  73  *****************************************************************************/
  74 static WineD3DContext *AddContextToArray(IWineD3DDeviceImpl *This, HWND win_handle, HDC hdc, HGLRC glCtx, HPBUFFERARB pbuffer) {
  75     WineD3DContext **oldArray = This->contexts;
  76     DWORD state;
  77
  78     This->contexts = HeapAlloc(GetProcessHeap(), 0, sizeof(*This->contexts) * (This->numContexts + 1));
  79     if(This->contexts == NULL) {
  80         ERR("Unable to grow the context array\n");
  81         This->contexts = oldArray;
  82         return NULL;
  83     }
  84     if(oldArray) {
  85         memcpy(This->contexts, oldArray, sizeof(*This->contexts) * This->numContexts);
  86     }
  87
  88     This->contexts[This->numContexts] = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(WineD3DContext));
  89     if(This->contexts[This->numContexts] == NULL) {
  90         ERR("Unable to allocate a new context\n");
  91         HeapFree(GetProcessHeap(), 0, This->contexts);
  92         This->contexts = oldArray;
  93         return NULL;
  94     }
  95
  96     This->contexts[This->numContexts]->hdc = hdc;
  97     This->contexts[This->numContexts]->glCtx = glCtx;
  98     This->contexts[This->numContexts]->pbuffer = pbuffer;
  99     This->contexts[This->numContexts]->win_handle = win_handle;
 100     HeapFree(GetProcessHeap(), 0, oldArray);
 101
 102     /* Mark all states dirty to force a proper initialization of the states on the first use of the context
 103      */
 104     for(state = 0; state <= STATE_HIGHEST; state++) {
 105         Context_MarkStateDirty(This->contexts[This->numContexts], state, This->shader_backend->StateTable);
 106     }
 107
 108     This->numContexts++;
 109     TRACE("Created context %p\n", This->contexts[This->numContexts - 1]);
 110     return This->contexts[This->numContexts - 1];
 111 }
 112
 113 /*****************************************************************************
 114  * CreateContext
 115  *
 116  * Creates a new context for a window, or a pbuffer context.
 117  *
 118  * * Params:
 119  *  This: Device to activate the context for
 120  *  target: Surface this context will render to
 121  *  win_handle: handle to the window which we are drawing to
 122  *  create_pbuffer: tells whether to create a pbuffer or not
 123  *  pPresentParameters: contains the pixelformats to use for onscreen rendering
 124  *
 125  *****************************************************************************/
 126 WineD3DContext *CreateContext(IWineD3DDeviceImpl *This, IWineD3DSurfaceImpl *target, HWND win_handle, BOOL create_pbuffer, const WINED3DPRESENT_PARAMETERS *pPresentParms) {
 127     HDC oldDrawable, hdc;
 128     HPBUFFERARB pbuffer = NULL;
 129     HGLRC ctx = NULL, oldCtx;
 130     WineD3DContext *ret = NULL;
 131     int s;
 132
 133     TRACE("(%p): Creating a %s context for render target %p\n", This, create_pbuffer ? "offscreen" : "onscreen", target);
 134
 135 #define PUSH1(att)        attribs[nAttribs++] = (att);
 136 #define PUSH2(att,value)  attribs[nAttribs++] = (att); attribs[nAttribs++] = (value);
 137     if(create_pbuffer) {
 138         HDC hdc_parent = GetDC(win_handle);
 139         int iPixelFormat = 0;
 140         short redBits, greenBits, blueBits, alphaBits, colorBits;
 141         short depthBits, stencilBits;
 142
 143         IWineD3DSurface *StencilSurface = This->stencilBufferTarget;
 144         WINED3DFORMAT StencilBufferFormat = (NULL != StencilSurface) ? ((IWineD3DSurfaceImpl *) StencilSurface)->resource.format : 0;
 145
 146         int attribs[256];
 147         int nAttribs = 0;
 148         unsigned int nFormats;
 149
 150         /* Retrieve the specifications for the pixelformat from the backbuffer / stencilbuffer */
 151         getColorBits(target->resource.format, &redBits, &greenBits, &blueBits, &alphaBits, &colorBits);
 152         getDepthStencilBits(StencilBufferFormat, &depthBits, &stencilBits);
 153         PUSH2(WGL_DRAW_TO_PBUFFER_ARB, 1); /* We need pbuffer support; doublebuffering isn't needed */
 154         PUSH2(WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB); /* Make sure we don't get a float or color index format */
 155         PUSH2(WGL_COLOR_BITS_ARB, colorBits);
 156         PUSH2(WGL_RED_BITS_ARB, redBits);
 157         PUSH2(WGL_GREEN_BITS_ARB, greenBits);
 158         PUSH2(WGL_BLUE_BITS_ARB, blueBits);
 159         PUSH2(WGL_ALPHA_BITS_ARB, alphaBits);
 160         PUSH2(WGL_DEPTH_BITS_ARB, depthBits);
 161         PUSH2(WGL_STENCIL_BITS_ARB, stencilBits);
 162         PUSH1(0); /* end the list */
 163
 164         /* Try to find a pixelformat that matches exactly. If that fails let ChoosePixelFormat try to find a close match */
 165         if(!GL_EXTCALL(wglChoosePixelFormatARB(hdc_parent, (const int*)&attribs, NULL, 1, &iPixelFormat, &nFormats)))
 166         {
 167             PIXELFORMATDESCRIPTOR pfd;
 168
 169             TRACE("Falling back to ChoosePixelFormat as wglChoosePixelFormatARB failed\n");
 170
 171             ZeroMemory(&pfd, sizeof(pfd));
 172             pfd.nSize      = sizeof(pfd);
 173             pfd.nVersion   = 1;
 174             pfd.dwFlags    = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER_DONTCARE | PFD_DRAW_TO_WINDOW;
 175             pfd.iPixelType = PFD_TYPE_RGBA;
 176             pfd.cColorBits = colorBits;
 177             pfd.cDepthBits = depthBits;
 178             pfd.cStencilBits = stencilBits;
 179             pfd.iLayerType = PFD_MAIN_PLANE;
 180
 181             iPixelFormat = ChoosePixelFormat(hdc_parent, &pfd);
 182             if(!iPixelFormat) {
 183                 /* If this happens something is very wrong as ChoosePixelFormat barely fails */
 184                 ERR("Can't find a suitable iPixelFormat for the pbuffer\n");
 185             }
 186         }
 187
 188         TRACE("Creating a pBuffer drawable for the new context\n");
 189         pbuffer = GL_EXTCALL(wglCreatePbufferARB(hdc_parent, iPixelFormat, target->currentDesc.Width, target->currentDesc.Height, 0));
 190         if(!pbuffer) {
 191             ERR("Cannot create a pbuffer\n");
 192             ReleaseDC(win_handle, hdc_parent);
 193             goto out;
 194         }
 195
 196         /* In WGL a pbuffer is 'wrapped' inside a HDC to 'fool' wglMakeCurrent */
 197         hdc = GL_EXTCALL(wglGetPbufferDCARB(pbuffer));
 198         if(!hdc) {
 199             ERR("Cannot get a HDC for pbuffer (%p)\n", pbuffer);
 200             GL_EXTCALL(wglDestroyPbufferARB(pbuffer));
 201             ReleaseDC(win_handle, hdc_parent);
 202             goto out;
 203         }
 204         ReleaseDC(win_handle, hdc_parent);
 205     } else {
 206         PIXELFORMATDESCRIPTOR pfd;
 207         int iPixelFormat;
 208         short redBits, greenBits, blueBits, alphaBits, colorBits;
 209         short depthBits=0, stencilBits=0;
 210         int res;
 211         int attribs[256];
 212         int nAttribs = 0;
 213         unsigned int nFormats;
 214         WINED3DFORMAT fmt = target->resource.format;
 215
 216         hdc = GetDC(win_handle);
 217         if(hdc == NULL) {
 218             ERR("Cannot retrieve a device context!\n");
 219             goto out;
 220         }
 221
 222         /* PixelFormat selection */
 223         PUSH2(WGL_DRAW_TO_WINDOW_ARB, GL_TRUE); /* We want to draw to a window */
 224         PUSH2(WGL_DOUBLE_BUFFER_ARB, GL_TRUE);
 225         PUSH2(WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB); /* Make sure we don't get a float or color index format */
 226         PUSH2(WGL_SUPPORT_OPENGL_ARB, GL_TRUE);
 227         PUSH2(WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB); /* Make sure we receive an accelerated format. On windows (at least on ATI) this is not always the case */
 228
 229         /* In case of ORM_BACKBUFFER, make sure to request an alpha component for X4R4G4B4/X8R8G8B8 as we might need it for the backbuffer. */
 230         if(wined3d_settings.offscreen_rendering_mode == ORM_BACKBUFFER) {
 231             if(target->resource.format == WINED3DFMT_X4R4G4B4)
 232                 fmt = WINED3DFMT_A4R4G4B4;
 233             else if(target->resource.format == WINED3DFMT_X8R8G8B8)
 234                 fmt = WINED3DFMT_A8R8G8B8;
 235
 236             /* We like to have two aux buffers in backbuffer mode */
 237             PUSH2(WGL_AUX_BUFFERS_ARB, 2);
 238         }
 239
 240         /* DirectDraw supports 8bit paletted render targets and these are used by old games like Starcraft and C&C.
 241          * Most modern hardware doesn't support 8bit natively so we perform some form of 8bit -> 32bit conversion.
 242          * The conversion (ab)uses the alpha component for storing the palette index. For this reason we require
 243          * a format with 8bit alpha, so request A8R8G8B8. */
 244         if(fmt == WINED3DFMT_P8)
 245             fmt = WINED3DFMT_A8R8G8B8;
 246
 247         if(!getColorBits(fmt, &redBits, &greenBits, &blueBits, &alphaBits, &colorBits)) {
 248             ERR("Unable to get color bits for format %#x!\n", target->resource.format);
 249             return FALSE;
 250         }
 251         PUSH2(WGL_COLOR_BITS_ARB, colorBits);
 252         PUSH2(WGL_RED_BITS_ARB, redBits);
 253         PUSH2(WGL_GREEN_BITS_ARB, greenBits);
 254         PUSH2(WGL_BLUE_BITS_ARB, blueBits);
 255         PUSH2(WGL_ALPHA_BITS_ARB, alphaBits);
 256
 257         /* Retrieve the depth stencil format from the present parameters.
 258          * The choice of the proper format can give a nice performance boost
 259          * in case of GPU limited programs. */
 260         if(pPresentParms->EnableAutoDepthStencil) {
 261             TRACE("pPresentParms->EnableAutoDepthStencil=enabled; using AutoDepthStencilFormat=%s\n", debug_d3dformat(pPresentParms->AutoDepthStencilFormat));
 262             if(!getDepthStencilBits(pPresentParms->AutoDepthStencilFormat, &depthBits, &stencilBits)) {
 263                 ERR("Unable to get depth / stencil bits for AutoDepthStencilFormat %#x!\n", pPresentParms->AutoDepthStencilFormat);
 264                 return FALSE;
 265             }
 266             PUSH2(WGL_DEPTH_BITS_ARB, depthBits);
 267             PUSH2(WGL_STENCIL_BITS_ARB, stencilBits);
 268         }
 269
 270         PUSH1(0); /* end the list */
 271
 272         /* In case of failure hope that standard ChoosePixelFormat will find something suitable */
 273         if(!GL_EXTCALL(wglChoosePixelFormatARB(hdc, (const int*)&attribs, NULL, 1, &iPixelFormat, &nFormats)))
 274         {
 275             /* PixelFormat selection */
 276             ZeroMemory(&pfd, sizeof(pfd));
 277             pfd.nSize      = sizeof(pfd);
 278             pfd.nVersion   = 1;
 279             pfd.dwFlags    = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW;/*PFD_GENERIC_ACCELERATED*/
 280             pfd.iPixelType = PFD_TYPE_RGBA;
 281             pfd.cAlphaBits = alphaBits;
 282             pfd.cColorBits = colorBits;
 283             pfd.cDepthBits = depthBits;
 284             pfd.cStencilBits = stencilBits;
 285             pfd.iLayerType = PFD_MAIN_PLANE;
 286
 287             iPixelFormat = ChoosePixelFormat(hdc, &pfd);
 288             if(!iPixelFormat) {
 289                 /* If this happens something is very wrong as ChoosePixelFormat barely fails */
 290                 ERR("Can't find a suitable iPixelFormat\n");
 291             }
 292         }
 293
 294         DescribePixelFormat(hdc, iPixelFormat, sizeof(pfd), &pfd);
 295         res = SetPixelFormat(hdc, iPixelFormat, NULL);
 296         if(!res) {
 297             int oldPixelFormat = GetPixelFormat(hdc);
 298
 299             if(oldPixelFormat) {
 300                 /* OpenGL doesn't allow pixel format adjustments. Print an error and continue using the old format.
 301                  * There's a big chance that the old format works although with a performance hit and perhaps rendering errors. */
 302                 ERR("HDC=%p is already set to iPixelFormat=%d and OpenGL doesn't allow changes!\n", hdc, oldPixelFormat);
 303             }
 304             else {
 305                 ERR("SetPixelFormat failed on HDC=%p for iPixelFormat=%d\n", hdc, iPixelFormat);
 306                 return FALSE;
 307             }
 308         }
 309     }
 310 #undef PUSH1
 311 #undef PUSH2
 312
 313     ctx = pwglCreateContext(hdc);
 314     if(This->numContexts) pwglShareLists(This->contexts[0]->glCtx, ctx);
 315
 316     if(!ctx) {
 317         ERR("Failed to create a WGL context\n");
 318         if(create_pbuffer) {
 319             GL_EXTCALL(wglReleasePbufferDCARB(pbuffer, hdc));
 320             GL_EXTCALL(wglDestroyPbufferARB(pbuffer));
 321         }
 322         goto out;
 323     }
 324     ret = AddContextToArray(This, win_handle, hdc, ctx, pbuffer);
 325     if(!ret) {
 326         ERR("Failed to add the newly created context to the context list\n");
 327         pwglDeleteContext(ctx);
 328         if(create_pbuffer) {
 329             GL_EXTCALL(wglReleasePbufferDCARB(pbuffer, hdc));
 330             GL_EXTCALL(wglDestroyPbufferARB(pbuffer));
 331         }
 332         goto out;
 333     }
 334     ret->surface = (IWineD3DSurface *) target;
 335     ret->isPBuffer = create_pbuffer;
 336     ret->tid = GetCurrentThreadId();
 337     if(This->shader_backend->shader_dirtifyable_constants((IWineD3DDevice *) This)) {
 338         /* Create the dirty constants array and initialize them to dirty */
 339         ret->vshader_const_dirty = HeapAlloc(GetProcessHeap(), 0,
 340                 sizeof(*ret->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
 341         ret->pshader_const_dirty = HeapAlloc(GetProcessHeap(), 0,
 342                 sizeof(*ret->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
 343         memset(ret->vshader_const_dirty, 1,
 344                sizeof(*ret->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
 345         memset(ret->pshader_const_dirty, 1,
 346                 sizeof(*ret->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
 347     }
 348
 349     TRACE("Successfully created new context %p\n", ret);
 350
 351     /* Set up the context defaults */
 352     oldCtx  = pwglGetCurrentContext();
 353     oldDrawable = pwglGetCurrentDC();
 354     if(oldCtx && oldDrawable && GL_SUPPORT(ATI_FRAGMENT_SHADER)) {
 355         /* See comment in ActivateContext context switching */
 356         glDisable(GL_FRAGMENT_SHADER_ATI);
 357         checkGLcall("glEnable(GL_FRAGMENT_SHADER_ATI)");
 358     }
 359     if(pwglMakeCurrent(hdc, ctx) == FALSE) {
 360         ERR("Cannot activate context to set up defaults\n");
 361         goto out;
 362     }
 363
 364     ENTER_GL();
 365
 366     glGetIntegerv(GL_AUX_BUFFERS, &ret->aux_buffers);
 367
 368     TRACE("Setting up the screen\n");
 369     /* Clear the screen */
 370     glClearColor(1.0, 0.0, 0.0, 0.0);
 371     checkGLcall("glClearColor");
 372     glClearIndex(0);
 373     glClearDepth(1);
 374     glClearStencil(0xffff);
 375
 376     checkGLcall("glClear");
 377
 378     glColor3f(1.0, 1.0, 1.0);
 379     checkGLcall("glColor3f");
 380
 381     glEnable(GL_LIGHTING);
 382     checkGLcall("glEnable");
 383
 384     glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
 385     checkGLcall("glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);");
 386
 387     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
 388     checkGLcall("glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);");
 389
 390     glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
 391     checkGLcall("glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);");
 392
 393     glPixelStorei(GL_PACK_ALIGNMENT, This->surface_alignment);
 394     checkGLcall("glPixelStorei(GL_PACK_ALIGNMENT, This->surface_alignment);");
 395     glPixelStorei(GL_UNPACK_ALIGNMENT, This->surface_alignment);
 396     checkGLcall("glPixelStorei(GL_UNPACK_ALIGNMENT, This->surface_alignment);");
 397
 398     if(GL_SUPPORT(APPLE_CLIENT_STORAGE)) {
 399         /* Most textures will use client storage if supported. Exceptions are non-native power of 2 textures
 400          * and textures in DIB sections(due to the memory protection).
 401          */
 402         glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
 403         checkGLcall("glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE)");
 404     }
 405     if(GL_SUPPORT(ARB_VERTEX_BLEND)) {
 406         /* Direct3D always uses n-1 weights for n world matrices and uses 1 - sum for the last one
 407          * this is equal to GL_WEIGHT_SUM_UNITY_ARB. Enabling it doesn't do anything unless
 408          * GL_VERTEX_BLEND_ARB isn't enabled too
 409          */
 410         glEnable(GL_WEIGHT_SUM_UNITY_ARB);
 411         checkGLcall("glEnable(GL_WEIGHT_SUM_UNITY_ARB)");
 412     }
 413     if(GL_SUPPORT(NV_TEXTURE_SHADER2)) {
 414         glEnable(GL_TEXTURE_SHADER_NV);
 415         checkGLcall("glEnable(GL_TEXTURE_SHADER_NV)");
 416
 417         /* Set up the previous texture input for all shader units. This applies to bump mapping, and in d3d
 418          * the previous texture where to source the offset from is always unit - 1.
 419          */
 420         for(s = 1; s < GL_LIMITS(textures); s++) {
 421             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
 422             glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + s - 1);
 423             checkGLcall("glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, ...\n");
 424         }
 425     }
 426
 427     if(GL_SUPPORT(ARB_POINT_SPRITE)) {
 428         for(s = 0; s < GL_LIMITS(textures); s++) {
 429             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
 430             glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
 431             checkGLcall("glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE)\n");
 432         }
 433     }
 434     LEAVE_GL();
 435
 436     /* Never keep GL_FRAGMENT_SHADER_ATI enabled on a context that we switch away from,
 437      * but enable it for the first context we create, and reenable it on the old context
 438      */
 439     if(oldDrawable && oldCtx) {
 440         pwglMakeCurrent(oldDrawable, oldCtx);
 441     }
 442     if(GL_SUPPORT(ATI_FRAGMENT_SHADER)) {
 443         glEnable(GL_FRAGMENT_SHADER_ATI);
 444         checkGLcall("glEnable(GL_FRAGMENT_SHADER_ATI)");
 445     }
 446
 447 out:
 448     return ret;
 449 }
 450
 451 /*****************************************************************************
 452  * RemoveContextFromArray
 453  *
 454  * Removes a context from the context manager. The opengl context is not
 455  * destroyed or unset. context is not a valid pointer after that call.
 456  *
 457  * Similar to the former call this isn't a performance critical function. A
 458  * helper function for DestroyContext.
 459  *
 460  * Params:
 461  *  This: Device to activate the context for
 462  *  context: Context to remove
 463  *
 464  *****************************************************************************/
 465 static void RemoveContextFromArray(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 466     UINT t, s;
 467     WineD3DContext **oldArray = This->contexts;
 468
 469     TRACE("Removing ctx %p\n", context);
 470
 471     This->numContexts--;
 472
 473     if(This->numContexts) {
 474         This->contexts = HeapAlloc(GetProcessHeap(), 0, sizeof(*This->contexts) * This->numContexts);
 475         if(!This->contexts) {
 476             ERR("Cannot allocate a new context array, PANIC!!!\n");
 477         }
 478         t = 0;
 479         for(s = 0; s < This->numContexts; s++) {
 480             if(oldArray[s] == context) continue;
 481             This->contexts[t] = oldArray[s];
 482             t++;
 483         }
 484     } else {
 485         This->contexts = NULL;
 486     }
 487
 488     HeapFree(GetProcessHeap(), 0, context);
 489     HeapFree(GetProcessHeap(), 0, oldArray);
 490 }
 491
 492 /*****************************************************************************
 493  * DestroyContext
 494  *
 495  * Destroys a wineD3DContext
 496  *
 497  * Params:
 498  *  This: Device to activate the context for
 499  *  context: Context to destroy
 500  *
 501  *****************************************************************************/
 502 void DestroyContext(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 503
 504     /* check that we are the current context first */
 505     TRACE("Destroying ctx %p\n", context);
 506     if(pwglGetCurrentContext() == context->glCtx){
 507         pwglMakeCurrent(NULL, NULL);
 508     }
 509
 510     if(context->isPBuffer) {
 511         GL_EXTCALL(wglReleasePbufferDCARB(context->pbuffer, context->hdc));
 512         GL_EXTCALL(wglDestroyPbufferARB(context->pbuffer));
 513     } else ReleaseDC(context->win_handle, context->hdc);
 514     pwglDeleteContext(context->glCtx);
 515
 516     HeapFree(GetProcessHeap(), 0, context->vshader_const_dirty);
 517     HeapFree(GetProcessHeap(), 0, context->pshader_const_dirty);
 518     RemoveContextFromArray(This, context);
 519 }
 520
 521 /*****************************************************************************
 522  * SetupForBlit
 523  *
 524  * Sets up a context for DirectDraw blitting.
 525  * All texture units are disabled, texture unit 0 is set as current unit
 526  * fog, lighting, blending, alpha test, z test, scissor test, culling disabled
 527  * color writing enabled for all channels
 528  * register combiners disabled, shaders disabled
 529  * world matrix is set to identity, texture matrix 0 too
 530  * projection matrix is setup for drawing screen coordinates
 531  *
 532  * Params:
 533  *  This: Device to activate the context for
 534  *  context: Context to setup
 535  *  width: render target width
 536  *  height: render target height
 537  *
 538  *****************************************************************************/
 539 static inline void SetupForBlit(IWineD3DDeviceImpl *This, WineD3DContext *context, UINT width, UINT height) {
 540     int i;
 541     const struct StateEntry *StateTable = This->shader_backend->StateTable;
 542
 543     TRACE("Setting up context %p for blitting\n", context);
 544     if(context->last_was_blit) {
 545         TRACE("Context is already set up for blitting, nothing to do\n");
 546         return;
 547     }
 548     context->last_was_blit = TRUE;
 549
 550     /* TODO: Use a display list */
 551
 552     /* Disable shaders */
 553     This->shader_backend->shader_cleanup((IWineD3DDevice *) This);
 554     Context_MarkStateDirty(context, STATE_VSHADER, StateTable);
 555     Context_MarkStateDirty(context, STATE_PIXELSHADER, StateTable);
 556
 557     /* Disable all textures. The caller can then bind a texture it wants to blit
 558      * from
 559      */
 560     if(GL_SUPPORT(NV_REGISTER_COMBINERS)) {
 561         glDisable(GL_REGISTER_COMBINERS_NV);
 562         checkGLcall("glDisable(GL_REGISTER_COMBINERS_NV)");
 563     }
 564     if (GL_SUPPORT(ARB_MULTITEXTURE)) {
 565         /* The blitting code uses (for now) the fixed function pipeline, so make sure to reset all fixed
 566          * function texture unit. No need to care for higher samplers
 567          */
 568         for(i = GL_LIMITS(textures) - 1; i > 0 ; i--) {
 569             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + i));
 570             checkGLcall("glActiveTextureARB");
 571
 572             if(GL_SUPPORT(ARB_TEXTURE_CUBE_MAP)) {
 573                 glDisable(GL_TEXTURE_CUBE_MAP_ARB);
 574                 checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
 575             }
 576             glDisable(GL_TEXTURE_3D);
 577             checkGLcall("glDisable GL_TEXTURE_3D");
 578             glDisable(GL_TEXTURE_2D);
 579             checkGLcall("glDisable GL_TEXTURE_2D");
 580
 581             glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 582             checkGLcall("glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);");
 583
 584             Context_MarkStateDirty(context, STATE_TEXTURESTAGE(i, WINED3DTSS_COLOROP), StateTable);
 585             Context_MarkStateDirty(context, STATE_SAMPLER(i), StateTable);
 586         }
 587         GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB));
 588         checkGLcall("glActiveTextureARB");
 589     }
 590     if(GL_SUPPORT(ARB_TEXTURE_CUBE_MAP)) {
 591         glDisable(GL_TEXTURE_CUBE_MAP_ARB);
 592         checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
 593     }
 594     glDisable(GL_TEXTURE_3D);
 595     checkGLcall("glDisable GL_TEXTURE_3D");
 596     glDisable(GL_TEXTURE_2D);
 597     checkGLcall("glDisable GL_TEXTURE_2D");
 598
 599     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 600
 601     glMatrixMode(GL_TEXTURE);
 602     checkGLcall("glMatrixMode(GL_TEXTURE)");
 603     glLoadIdentity();
 604     checkGLcall("glLoadIdentity()");
 605     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_TEXTURE0), StateTable);
 606
 607     if (GL_SUPPORT(EXT_TEXTURE_LOD_BIAS)) {
 608         glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT,
 609                   GL_TEXTURE_LOD_BIAS_EXT,
 610                   0.0);
 611         checkGLcall("glTexEnvi GL_TEXTURE_LOD_BIAS_EXT ...");
 612     }
 613     Context_MarkStateDirty(context, STATE_SAMPLER(0), StateTable);
 614     Context_MarkStateDirty(context, STATE_TEXTURESTAGE(0, WINED3DTSS_COLOROP), StateTable);
 615
 616     /* Other misc states */
 617     glDisable(GL_ALPHA_TEST);
 618     checkGLcall("glDisable(GL_ALPHA_TEST)");
 619     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHATESTENABLE), StateTable);
 620     glDisable(GL_LIGHTING);
 621     checkGLcall("glDisable GL_LIGHTING");
 622     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_LIGHTING), StateTable);
 623     glDisable(GL_DEPTH_TEST);
 624     checkGLcall("glDisable GL_DEPTH_TEST");
 625     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ZENABLE), StateTable);
 626     glDisable(GL_FOG);
 627     checkGLcall("glDisable GL_FOG");
 628     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_FOGENABLE), StateTable);
 629     glDisable(GL_BLEND);
 630     checkGLcall("glDisable GL_BLEND");
 631     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
 632     glDisable(GL_CULL_FACE);
 633     checkGLcall("glDisable GL_CULL_FACE");
 634     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CULLMODE), StateTable);
 635     glDisable(GL_STENCIL_TEST);
 636     checkGLcall("glDisable GL_STENCIL_TEST");
 637     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_STENCILENABLE), StateTable);
 638     glDisable(GL_SCISSOR_TEST);
 639     checkGLcall("glDisable GL_SCISSOR_TEST");
 640     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
 641     if(GL_SUPPORT(ARB_POINT_SPRITE)) {
 642         glDisable(GL_POINT_SPRITE_ARB);
 643         checkGLcall("glDisable GL_POINT_SPRITE_ARB");
 644         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_POINTSPRITEENABLE), StateTable);
 645     }
 646     glColorMask(GL_TRUE, GL_TRUE,GL_TRUE,GL_TRUE);
 647     checkGLcall("glColorMask");
 648     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
 649     if (GL_SUPPORT(EXT_SECONDARY_COLOR)) {
 650         glDisable(GL_COLOR_SUM_EXT);
 651         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
 652         checkGLcall("glDisable(GL_COLOR_SUM_EXT)");
 653     }
 654     if (GL_SUPPORT(NV_REGISTER_COMBINERS)) {
 655         GL_EXTCALL(glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB));
 656         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
 657         checkGLcall("glFinalCombinerInputNV");
 658     }
 659
 660     /* Setup transforms */
 661     glMatrixMode(GL_MODELVIEW);
 662     checkGLcall("glMatrixMode(GL_MODELVIEW)");
 663     glLoadIdentity();
 664     checkGLcall("glLoadIdentity()");
 665     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_WORLDMATRIX(0)), StateTable);
 666
 667     glMatrixMode(GL_PROJECTION);
 668     checkGLcall("glMatrixMode(GL_PROJECTION)");
 669     glLoadIdentity();
 670     checkGLcall("glLoadIdentity()");
 671     glOrtho(0, width, height, 0, 0.0, -1.0);
 672     checkGLcall("glOrtho");
 673     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_PROJECTION), StateTable);
 674
 675     context->last_was_rhw = TRUE;
 676     Context_MarkStateDirty(context, STATE_VDECL, StateTable); /* because of last_was_rhw = TRUE */
 677
 678     glDisable(GL_CLIP_PLANE0); checkGLcall("glDisable(clip plane 0)");
 679     glDisable(GL_CLIP_PLANE1); checkGLcall("glDisable(clip plane 1)");
 680     glDisable(GL_CLIP_PLANE2); checkGLcall("glDisable(clip plane 2)");
 681     glDisable(GL_CLIP_PLANE3); checkGLcall("glDisable(clip plane 3)");
 682     glDisable(GL_CLIP_PLANE4); checkGLcall("glDisable(clip plane 4)");
 683     glDisable(GL_CLIP_PLANE5); checkGLcall("glDisable(clip plane 5)");
 684     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
 685
 686     glViewport(0, 0, width, height);
 687     checkGLcall("glViewport");
 688     Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 689
 690     if(GL_SUPPORT(NV_TEXTURE_SHADER2)) {
 691         glDisable(GL_TEXTURE_SHADER_NV);
 692         checkGLcall("glDisable(GL_TEXTURE_SHADER_NV)");
 693     } else if(GL_SUPPORT(ATI_FRAGMENT_SHADER)) {
 694         glDisable(GL_FRAGMENT_SHADER_ATI);
 695         checkGLcall("glDisable(GL_FRAGMENT_SHADER_ATI)");
 696     }
 697 }
 698
 699 /*****************************************************************************
 700  * findThreadContextForSwapChain
 701  *
 702  * Searches a swapchain for all contexts and picks one for the thread tid.
 703  * If none can be found the swapchain is requested to create a new context
 704  *
 705  *****************************************************************************/
 706 static WineD3DContext *findThreadContextForSwapChain(IWineD3DSwapChain *swapchain, DWORD tid) {
 707     int i;
 708
 709     for(i = 0; i < ((IWineD3DSwapChainImpl *) swapchain)->num_contexts; i++) {
 710         if(((IWineD3DSwapChainImpl *) swapchain)->context[i]->tid == tid) {
 711             return ((IWineD3DSwapChainImpl *) swapchain)->context[i];
 712         }
 713
 714     }
 715
 716     /* Create a new context for the thread */
 717     return IWineD3DSwapChainImpl_CreateContextForThread(swapchain);
 718 }
 719
 720 /*****************************************************************************
 721  * FindContext
 722  *
 723  * Finds a context for the current render target and thread
 724  *
 725  * Parameters:
 726  *  target: Render target to find the context for
 727  *  tid: Thread to activate the context for
 728  *
 729  * Returns: The needed context
 730  *
 731  *****************************************************************************/
 732 static inline WineD3DContext *FindContext(IWineD3DDeviceImpl *This, IWineD3DSurface *target, DWORD tid, GLint *buffer) {
 733     IWineD3DSwapChain *swapchain = NULL;
 734     HRESULT hr;
 735     BOOL readTexture = wined3d_settings.offscreen_rendering_mode != ORM_FBO && This->render_offscreen;
 736     WineD3DContext *context = This->activeContext;
 737     BOOL oldRenderOffscreen = This->render_offscreen;
 738     const WINED3DFORMAT oldFmt = ((IWineD3DSurfaceImpl *) This->lastActiveRenderTarget)->resource.format;
 739     const WINED3DFORMAT newFmt = ((IWineD3DSurfaceImpl *) target)->resource.format;
 740     const struct StateEntry *StateTable = This->shader_backend->StateTable;
 741
 742     /* To compensate the lack of format switching with some offscreen rendering methods and on onscreen buffers
 743      * the alpha blend state changes with different render target formats
 744      */
 745     if(oldFmt != newFmt) {
 746         const GlPixelFormatDesc *glDesc;
 747         const StaticPixelFormatDesc *old = getFormatDescEntry(oldFmt, NULL, NULL);
 748         const StaticPixelFormatDesc *new = getFormatDescEntry(newFmt, &GLINFO_LOCATION, &glDesc);
 749
 750         /* Disable blending when the alphaMask has changed and when a format doesn't support blending */
 751         if((old->alphaMask && !new->alphaMask) || (!old->alphaMask && new->alphaMask) || !(glDesc->Flags & WINED3DFMT_FLAG_POSTPIXELSHADER_BLENDING)) {
 752             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
 753         }
 754     }
 755
 756     hr = IWineD3DSurface_GetContainer(target, &IID_IWineD3DSwapChain, (void **) &swapchain);
 757     if(hr == WINED3D_OK && swapchain) {
 758         TRACE("Rendering onscreen\n");
 759
 760         context = findThreadContextForSwapChain(swapchain, tid);
 761
 762         This->render_offscreen = FALSE;
 763         /* The context != This->activeContext will catch a NOP context change. This can occur
 764          * if we are switching back to swapchain rendering in case of FBO or Back Buffer offscreen
 765          * rendering. No context change is needed in that case
 766          */
 767
 768         if(((IWineD3DSwapChainImpl *) swapchain)->frontBuffer == target) {
 769             *buffer = GL_FRONT;
 770         } else {
 771             *buffer = GL_BACK;
 772         }
 773         if(wined3d_settings.offscreen_rendering_mode == ORM_PBUFFER) {
 774             if(This->pbufferContext && tid == This->pbufferContext->tid) {
 775                 This->pbufferContext->tid = 0;
 776             }
 777         }
 778         IWineD3DSwapChain_Release(swapchain);
 779
 780         if(oldRenderOffscreen) {
 781             Context_MarkStateDirty(context, WINED3DTS_PROJECTION, StateTable);
 782             Context_MarkStateDirty(context, STATE_VDECL, StateTable);
 783             Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 784             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
 785             Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
 786         }
 787
 788     } else {
 789         TRACE("Rendering offscreen\n");
 790         This->render_offscreen = TRUE;
 791         *buffer = This->offscreenBuffer;
 792
 793         switch(wined3d_settings.offscreen_rendering_mode) {
 794             case ORM_FBO:
 795                 /* FBOs do not need a different context. Stay with whatever context is active at the moment */
 796                 if(This->activeContext && tid == This->lastThread) {
 797                     context = This->activeContext;
 798                 } else {
 799                     /* This may happen if the app jumps straight into offscreen rendering
 800                      * Start using the context of the primary swapchain. tid == 0 is no problem
 801                      * for findThreadContextForSwapChain.
 802                      *
 803                      * Can also happen on thread switches - in that case findThreadContextForSwapChain
 804                      * is perfect to call.
 805                      */
 806                     context = findThreadContextForSwapChain(This->swapchains[0], tid);
 807                 }
 808                 break;
 809
 810             case ORM_PBUFFER:
 811             {
 812                 IWineD3DSurfaceImpl *targetimpl = (IWineD3DSurfaceImpl *) target;
 813                 if(This->pbufferContext == NULL ||
 814                    This->pbufferWidth < targetimpl->currentDesc.Width ||
 815                    This->pbufferHeight < targetimpl->currentDesc.Height) {
 816                     if(This->pbufferContext) {
 817                         DestroyContext(This, This->pbufferContext);
 818                     }
 819
 820                     /* The display is irrelevant here, the window is 0. But CreateContext needs a valid X connection.
 821                      * Create the context on the same server as the primary swapchain. The primary swapchain is exists at this point.
 822                      */
 823                     This->pbufferContext = CreateContext(This, targetimpl,
 824                             ((IWineD3DSwapChainImpl *) This->swapchains[0])->context[0]->win_handle,
 825                             TRUE /* pbuffer */, &((IWineD3DSwapChainImpl *)This->swapchains[0])->presentParms);
 826                     This->pbufferWidth = targetimpl->currentDesc.Width;
 827                     This->pbufferHeight = targetimpl->currentDesc.Height;
 828                    }
 829
 830                    if(This->pbufferContext) {
 831                        if(This->pbufferContext->tid != 0 && This->pbufferContext->tid != tid) {
 832                            FIXME("The PBuffr context is only supported for one thread for now!\n");
 833                        }
 834                        This->pbufferContext->tid = tid;
 835                        context = This->pbufferContext;
 836                        break;
 837                    } else {
 838                        ERR("Failed to create a buffer context and drawable, falling back to back buffer offscreen rendering\n");
 839                        wined3d_settings.offscreen_rendering_mode = ORM_BACKBUFFER;
 840                    }
 841             }
 842
 843             case ORM_BACKBUFFER:
 844                 /* Stay with the currently active context for back buffer rendering */
 845                 if(This->activeContext && tid == This->lastThread) {
 846                     context = This->activeContext;
 847                 } else {
 848                     /* This may happen if the app jumps straight into offscreen rendering
 849                      * Start using the context of the primary swapchain. tid == 0 is no problem
 850                      * for findThreadContextForSwapChain.
 851                      *
 852                      * Can also happen on thread switches - in that case findThreadContextForSwapChain
 853                      * is perfect to call.
 854                      */
 855                     context = findThreadContextForSwapChain(This->swapchains[0], tid);
 856                 }
 857                 break;
 858         }
 859
 860         if (wined3d_settings.offscreen_rendering_mode != ORM_FBO) {
 861             /* Make sure we have a OpenGL texture name so the PreLoad() used to read the buffer
 862              * back when we are done won't mark us dirty.
 863              */
 864             IWineD3DSurface_PreLoad(target);
 865         }
 866
 867         if(!oldRenderOffscreen) {
 868             Context_MarkStateDirty(context, WINED3DTS_PROJECTION, StateTable);
 869             Context_MarkStateDirty(context, STATE_VDECL, StateTable);
 870             Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 871             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
 872             Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
 873         }
 874     }
 875     if (readTexture) {
 876         BOOL oldInDraw = This->isInDraw;
 877
 878         /* PreLoad requires a context to load the texture, thus it will call ActivateContext.
 879          * Set the isInDraw to true to signal PreLoad that it has a context. Will be tricky
 880          * when using offscreen rendering with multithreading
 881          */
 882         This->isInDraw = TRUE;
 883
 884         /* Do that before switching the context:
 885          * Read the back buffer of the old drawable into the destination texture
 886          */
 887         IWineD3DSurface_PreLoad(This->lastActiveRenderTarget);
 888
 889         /* Assume that the drawable will be modified by some other things now */
 890         IWineD3DSurface_ModifyLocation(This->lastActiveRenderTarget, SFLAG_INDRAWABLE, FALSE);
 891
 892         This->isInDraw = oldInDraw;
 893     }
 894
 895     if(oldRenderOffscreen != This->render_offscreen && This->depth_copy_state != WINED3D_DCS_NO_COPY) {
 896         This->depth_copy_state = WINED3D_DCS_COPY;
 897     }
 898     return context;
 899 }
 900
 901 /*****************************************************************************
 902  * ActivateContext
 903  *
 904  * Finds a rendering context and drawable matching the device and render
 905  * target for the current thread, activates them and puts them into the
 906  * requested state.
 907  *
 908  * Params:
 909  *  This: Device to activate the context for
 910  *  target: Requested render target
 911  *  usage: Prepares the context for blitting, drawing or other actions
 912  *
 913  *****************************************************************************/
 914 void ActivateContext(IWineD3DDeviceImpl *This, IWineD3DSurface *target, ContextUsage usage) {
 915     DWORD                         tid = GetCurrentThreadId();
 916     int                           i;
 917     DWORD                         dirtyState, idx;
 918     BYTE                          shift;
 919     WineD3DContext                *context;
 920     GLint                         drawBuffer=0;
 921     const struct StateEntry       *StateTable = This->shader_backend->StateTable;
 922
 923     TRACE("(%p): Selecting context for render target %p, thread %d\n", This, target, tid);
 924     if(This->lastActiveRenderTarget != target || tid != This->lastThread) {
 925         context = FindContext(This, target, tid, &drawBuffer);
 926         This->lastActiveRenderTarget = target;
 927         This->lastThread = tid;
 928     } else {
 929         /* Stick to the old context */
 930         context = This->activeContext;
 931     }
 932
 933     /* Activate the opengl context */
 934     if(context != This->activeContext) {
 935         BOOL ret;
 936
 937         /* Prevent an unneeded context switch as those are expensive */
 938         if(context->glCtx && (context->glCtx == pwglGetCurrentContext())) {
 939             TRACE("Already using gl context %p\n", context->glCtx);
 940         }
 941         else {
 942             TRACE("Switching gl ctx to %p, hdc=%p ctx=%p\n", context, context->hdc, context->glCtx);
 943
 944             if(GL_SUPPORT(ATI_FRAGMENT_SHADER)) {
 945                 /* Mesa crashes when enabling a context with GL_FRAGMENT_SHADER_ATI enabled.
 946                  * Thus we disable it before deactivating any context, and re-enable it afterwards.
 947                  *
 948                  * This bug is filed as bug #15269 on bugs.freedesktop.org
 949                  */
 950                 glDisable(GL_FRAGMENT_SHADER_ATI);
 951                 checkGLcall("glEnable(GL_FRAGMENT_SHADER_ATI)");
 952             }
 953
 954             ret = pwglMakeCurrent(context->hdc, context->glCtx);
 955             if(ret == FALSE) {
 956                 ERR("Failed to activate the new context\n");
 957             } else if(GL_SUPPORT(ATI_FRAGMENT_SHADER) && !context->last_was_blit) {
 958                 glEnable(GL_FRAGMENT_SHADER_ATI);
 959                 checkGLcall("glEnable(GL_FRAGMENT_SHADER_ATI)");
 960             }
 961         }
 962         if(This->activeContext->vshader_const_dirty) {
 963             memset(This->activeContext->vshader_const_dirty, 1,
 964                    sizeof(*This->activeContext->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
 965         }
 966         if(This->activeContext->pshader_const_dirty) {
 967             memset(This->activeContext->pshader_const_dirty, 1,
 968                    sizeof(*This->activeContext->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
 969         }
 970         This->activeContext = context;
 971     }
 972
 973     /* We only need ENTER_GL for the gl calls made below and for the helper functions which make GL calls */
 974     ENTER_GL();
 975     /* Select the right draw buffer. It is selected in FindContext. */
 976     if(drawBuffer && context->last_draw_buffer != drawBuffer) {
 977         TRACE("Drawing to buffer: %#x\n", drawBuffer);
 978         context->last_draw_buffer = drawBuffer;
 979
 980         glDrawBuffer(drawBuffer);
 981         checkGLcall("glDrawBuffer");
 982     }
 983
 984     switch(usage) {
 985         case CTXUSAGE_RESOURCELOAD:
 986             /* This does not require any special states to be set up */
 987             break;
 988
 989         case CTXUSAGE_CLEAR:
 990             if(context->last_was_blit) {
 991                 if(GL_SUPPORT(NV_TEXTURE_SHADER2)) {
 992                     glEnable(GL_TEXTURE_SHADER_NV);
 993                     checkGLcall("glEnable(GL_TEXTURE_SHADER_NV)");
 994                 } else if(GL_SUPPORT(ATI_FRAGMENT_SHADER)) {
 995                     glEnable(GL_FRAGMENT_SHADER_ATI);
 996                     checkGLcall("glEnable(GL_FRAGMENT_SHADER_ATI)");
 997                 }
 998             }
 999
1000             /* Blending and clearing should be orthogonal, but tests on the nvidia driver show that disabling
1001              * blending when clearing improves the clearing performance increadibly
1002              */
1003             glDisable(GL_BLEND);
1004             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
1005
1006             glEnable(GL_SCISSOR_TEST);
1007             checkGLcall("glEnable GL_SCISSOR_TEST");
1008             context->last_was_blit = FALSE;
1009             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
1010             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
1011             break;
1012
1013         case CTXUSAGE_DRAWPRIM:
1014             /* This needs all dirty states applied */
1015             if(context->last_was_blit) {
1016                 if(GL_SUPPORT(NV_TEXTURE_SHADER2)) {
1017                     glEnable(GL_TEXTURE_SHADER_NV);
1018                     checkGLcall("glEnable(GL_TEXTURE_SHADER_NV)");
1019                 } else if(GL_SUPPORT(ATI_FRAGMENT_SHADER)) {
1020                     glEnable(GL_FRAGMENT_SHADER_ATI);
1021                     checkGLcall("glEnable(GL_FRAGMENT_SHADER_ATI)");
1022                 }
1023             }
1024
1025             IWineD3DDeviceImpl_FindTexUnitMap(This);
1026
1027             for(i=0; i < context->numDirtyEntries; i++) {
1028                 dirtyState = context->dirtyArray[i];
1029                 idx = dirtyState >> 5;
1030                 shift = dirtyState & 0x1f;
1031                 context->isStateDirty[idx] &= ~(1 << shift);
1032                 StateTable[dirtyState].apply(dirtyState, This->stateBlock, context);
1033             }
1034             context->numDirtyEntries = 0; /* This makes the whole list clean */
1035             context->last_was_blit = FALSE;
1036             break;
1037
1038         case CTXUSAGE_BLIT:
1039             SetupForBlit(This, context,
1040                          ((IWineD3DSurfaceImpl *)target)->currentDesc.Width,
1041                          ((IWineD3DSurfaceImpl *)target)->currentDesc.Height);
1042             break;
1043
1044         default:
1045             FIXME("Unexpected context usage requested\n");
1046     }
1047     LEAVE_GL();
1048 }