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

   1 /*
   2  * Copyright 2002-2005 Jason Edmeades
   3  * Copyright 2002-2005 Raphael Junqueira
   4  * Copyright 2004 Christian Costa
   5  * Copyright 2005 Oliver Stieber
   6  * Copyright 2007-2010 Stefan Dösinger for CodeWeavers
   7  * Copyright 2009 Henri Verbeet for CodeWeavers
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  *
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include "wined3d_private.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(d3d);
  31
  32 #define GLINFO_LOCATION This->resource.device->adapter->gl_info
  33
  34 #define VB_MAXDECLCHANGES     100     /* After that number of decl changes we stop converting */
  35 #define VB_RESETDECLCHANGE    1000    /* Reset the decl changecount after that number of draws */
  36 #define VB_MAXFULLCONVERSIONS 5       /* Number of full conversions before we stop converting */
  37 #define VB_RESETFULLCONVS     20      /* Reset full conversion counts after that number of draws */
  38
  39 static inline BOOL buffer_add_dirty_area(struct wined3d_buffer *This, UINT offset, UINT size)
  40 {
  41     if (!This->buffer_object) return TRUE;
  42
  43     if (This->maps_size <= This->modified_areas)
  44     {
  45         void *new = HeapReAlloc(GetProcessHeap(), 0, This->maps,
  46                                 This->maps_size * 2 * sizeof(*This->maps));
  47         if (!new)
  48         {
  49             ERR("Out of memory\n");
  50             return FALSE;
  51         }
  52         else
  53         {
  54             This->maps = new;
  55             This->maps_size *= 2;
  56         }
  57     }
  58
  59     if(offset > This->resource.size || offset + size > This->resource.size)
  60     {
  61         WARN("Invalid range dirtified, marking entire buffer dirty\n");
  62         offset = 0;
  63         size = This->resource.size;
  64     }
  65     else if(!offset && !size)
  66     {
  67         size = This->resource.size;
  68     }
  69
  70     This->maps[This->modified_areas].offset = offset;
  71     This->maps[This->modified_areas].size = size;
  72     This->modified_areas++;
  73     return TRUE;
  74 }
  75
  76 static inline void buffer_clear_dirty_areas(struct wined3d_buffer *This)
  77 {
  78     This->modified_areas = 0;
  79 }
  80
  81 static inline BOOL buffer_is_dirty(struct wined3d_buffer *This)
  82 {
  83     return This->modified_areas != 0;
  84 }
  85
  86 static inline BOOL buffer_is_fully_dirty(struct wined3d_buffer *This)
  87 {
  88     unsigned int i;
  89
  90     for(i = 0; i < This->modified_areas; i++)
  91     {
  92         if(This->maps[i].offset == 0 && This->maps[i].size == This->resource.size)
  93         {
  94             return TRUE;
  95         }
  96     }
  97     return FALSE;
  98 }
  99
 100 /* Context activation is done by the caller. */
 101 static void buffer_create_buffer_object(struct wined3d_buffer *This)
 102 {
 103     GLenum error, gl_usage;
 104     const struct wined3d_gl_info *gl_info = &This->resource.device->adapter->gl_info;
 105
 106     TRACE("Creating an OpenGL vertex buffer object for IWineD3DVertexBuffer %p Usage(%s)\n",
 107             This, debug_d3dusage(This->resource.usage));
 108
 109     ENTER_GL();
 110
 111     /* Make sure that the gl error is cleared. Do not use checkGLcall
 112     * here because checkGLcall just prints a fixme and continues. However,
 113     * if an error during VBO creation occurs we can fall back to non-vbo operation
 114     * with full functionality(but performance loss)
 115     */
 116     while (glGetError() != GL_NO_ERROR);
 117
 118     /* Basically the FVF parameter passed to CreateVertexBuffer is no good
 119      * It is the FVF set with IWineD3DDevice::SetFVF or the Vertex Declaration set with
 120      * IWineD3DDevice::SetVertexDeclaration that decides how the vertices in the buffer
 121      * look like. This means that on each DrawPrimitive call the vertex buffer has to be verified
 122      * to check if the rhw and color values are in the correct format.
 123      */
 124
 125     GL_EXTCALL(glGenBuffersARB(1, &This->buffer_object));
 126     error = glGetError();
 127     if (!This->buffer_object || error != GL_NO_ERROR)
 128     {
 129         ERR("Failed to create a VBO with error %s (%#x)\n", debug_glerror(error), error);
 130         LEAVE_GL();
 131         goto fail;
 132     }
 133
 134     if(This->buffer_type_hint == GL_ELEMENT_ARRAY_BUFFER_ARB)
 135     {
 136         IWineD3DDeviceImpl_MarkStateDirty(This->resource.device, STATE_INDEXBUFFER);
 137     }
 138     GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
 139     error = glGetError();
 140     if (error != GL_NO_ERROR)
 141     {
 142         ERR("Failed to bind the VBO with error %s (%#x)\n", debug_glerror(error), error);
 143         LEAVE_GL();
 144         goto fail;
 145     }
 146
 147     /* Don't use static, because dx apps tend to update the buffer
 148      * quite often even if they specify 0 usage.
 149      */
 150     if(This->resource.usage & WINED3DUSAGE_DYNAMIC)
 151     {
 152         TRACE("Gl usage = GL_STREAM_DRAW_ARB\n");
 153         gl_usage = GL_STREAM_DRAW_ARB;
 154
 155         if(gl_info->supported[APPLE_FLUSH_BUFFER_RANGE])
 156         {
 157             GL_EXTCALL(glBufferParameteriAPPLE(This->buffer_type_hint, GL_BUFFER_FLUSHING_UNMAP_APPLE, GL_FALSE));
 158             checkGLcall("glBufferParameteriAPPLE(This->buffer_type_hint, GL_BUFFER_FLUSHING_UNMAP_APPLE, GL_FALSE)");
 159             This->flags |= WINED3D_BUFFER_FLUSH;
 160         }
 161         /* No setup is needed here for GL_ARB_map_buffer_range */
 162     }
 163     else
 164     {
 165         TRACE("Gl usage = GL_DYNAMIC_DRAW_ARB\n");
 166         gl_usage = GL_DYNAMIC_DRAW_ARB;
 167     }
 168
 169     /* Reserve memory for the buffer. The amount of data won't change
 170      * so we are safe with calling glBufferData once and
 171      * calling glBufferSubData on updates. Upload the actual data in case
 172      * we're not double buffering, so we can release the heap mem afterwards
 173      */
 174     GL_EXTCALL(glBufferDataARB(This->buffer_type_hint, This->resource.size, This->resource.allocatedMemory, gl_usage));
 175     error = glGetError();
 176     LEAVE_GL();
 177     if (error != GL_NO_ERROR)
 178     {
 179         ERR("glBufferDataARB failed with error %s (%#x)\n", debug_glerror(error), error);
 180         goto fail;
 181     }
 182
 183     This->buffer_object_size = This->resource.size;
 184     This->buffer_object_usage = gl_usage;
 185
 186     if(This->flags & WINED3D_BUFFER_DOUBLEBUFFER)
 187     {
 188         if(!buffer_add_dirty_area(This, 0, 0))
 189         {
 190             ERR("buffer_add_dirty_area failed, this is not expected\n");
 191             goto fail;
 192         }
 193     }
 194     else
 195     {
 196         HeapFree(GetProcessHeap(), 0, This->resource.heapMemory);
 197         This->resource.allocatedMemory = NULL;
 198         This->resource.heapMemory = NULL;
 199     }
 200
 201     return;
 202
 203 fail:
 204     /* Clean up all vbo init, but continue because we can work without a vbo :-) */
 205     ERR("Failed to create a vertex buffer object. Continuing, but performance issues may occur\n");
 206     if (This->buffer_object)
 207     {
 208         ENTER_GL();
 209         GL_EXTCALL(glDeleteBuffersARB(1, &This->buffer_object));
 210         LEAVE_GL();
 211     }
 212     This->buffer_object = 0;
 213     buffer_clear_dirty_areas(This);
 214 }
 215
 216 static BOOL buffer_process_converted_attribute(struct wined3d_buffer *This,
 217         const enum wined3d_buffer_conversion_type conversion_type,
 218         const struct wined3d_stream_info_element *attrib, DWORD *stride_this_run)
 219 {
 220     DWORD attrib_size;
 221     BOOL ret = FALSE;
 222     unsigned int i;
 223     DWORD offset = This->resource.device->stateBlock->streamOffset[attrib->stream_idx];
 224     DWORD_PTR data;
 225
 226     /* Check for some valid situations which cause us pain. One is if the buffer is used for
 227      * constant attributes(stride = 0), the other one is if the buffer is used on two streams
 228      * with different strides. In the 2nd case we might have to drop conversion entirely,
 229      * it is possible that the same bytes are once read as FLOAT2 and once as UBYTE4N.
 230      */
 231     if (!attrib->stride)
 232     {
 233         FIXME("%s used with stride 0, let's hope we get the vertex stride from somewhere else\n",
 234                 debug_d3dformat(attrib->format_desc->format));
 235     }
 236     else if(attrib->stride != *stride_this_run && *stride_this_run)
 237     {
 238         FIXME("Got two concurrent strides, %d and %d\n", attrib->stride, *stride_this_run);
 239     }
 240     else
 241     {
 242         *stride_this_run = attrib->stride;
 243         if (This->stride != *stride_this_run)
 244         {
 245             /* We rely that this happens only on the first converted attribute that is found,
 246              * if at all. See above check
 247              */
 248             TRACE("Reconverting because converted attributes occur, and the stride changed\n");
 249             This->stride = *stride_this_run;
 250             HeapFree(GetProcessHeap(), HEAP_ZERO_MEMORY, This->conversion_map);
 251             This->conversion_map = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 252                     sizeof(*This->conversion_map) * This->stride);
 253             ret = TRUE;
 254         }
 255     }
 256
 257     data = (((DWORD_PTR)attrib->data) + offset) % This->stride;
 258     attrib_size = attrib->format_desc->component_count * attrib->format_desc->component_size;
 259     for (i = 0; i < attrib_size; ++i)
 260     {
 261         if (This->conversion_map[data + i] != conversion_type)
 262         {
 263             TRACE("Byte %ld in vertex changed\n", i + data);
 264             TRACE("It was type %d, is %d now\n", This->conversion_map[data + i], conversion_type);
 265             ret = TRUE;
 266             This->conversion_map[data + i] = conversion_type;
 267         }
 268     }
 269
 270     return ret;
 271 }
 272
 273 static BOOL buffer_check_attribute(struct wined3d_buffer *This, const struct wined3d_stream_info *si,
 274         UINT attrib_idx, const BOOL check_d3dcolor, const BOOL is_ffp_position, const BOOL is_ffp_color,
 275         DWORD *stride_this_run, BOOL *float16_used)
 276 {
 277     const struct wined3d_stream_info_element *attrib = &si->elements[attrib_idx];
 278     IWineD3DDeviceImpl *device = This->resource.device;
 279     const struct wined3d_gl_info *gl_info = &device->adapter->gl_info;
 280     BOOL ret = FALSE;
 281     WINED3DFORMAT format;
 282
 283     /* Ignore attributes that do not have our vbo. After that check we can be sure that the attribute is
 284      * there, on nonexistent attribs the vbo is 0.
 285      */
 286     if (!(si->use_map & (1 << attrib_idx))
 287             || attrib->buffer_object != This->buffer_object)
 288         return FALSE;
 289
 290     format = attrib->format_desc->format;
 291     /* Look for newly appeared conversion */
 292     if (!gl_info->supported[ARB_HALF_FLOAT_VERTEX]
 293             && (format == WINED3DFMT_R16G16_FLOAT || format == WINED3DFMT_R16G16B16A16_FLOAT))
 294     {
 295         ret = buffer_process_converted_attribute(This, CONV_FLOAT16_2, attrib, stride_this_run);
 296
 297         if (is_ffp_position) FIXME("Test FLOAT16 fixed function processing positions\n");
 298         else if (is_ffp_color) FIXME("test FLOAT16 fixed function processing colors\n");
 299         *float16_used = TRUE;
 300     }
 301     else if (check_d3dcolor && format == WINED3DFMT_B8G8R8A8_UNORM)
 302     {
 303         ret = buffer_process_converted_attribute(This, CONV_D3DCOLOR, attrib, stride_this_run);
 304
 305         if (!is_ffp_color) FIXME("Test for non-color fixed function WINED3DFMT_B8G8R8A8_UNORM format\n");
 306     }
 307     else if (is_ffp_position && format == WINED3DFMT_R32G32B32A32_FLOAT)
 308     {
 309         ret = buffer_process_converted_attribute(This, CONV_POSITIONT, attrib, stride_this_run);
 310     }
 311     else if (This->conversion_map)
 312     {
 313         ret = buffer_process_converted_attribute(This, CONV_NONE, attrib, stride_this_run);
 314     }
 315
 316     return ret;
 317 }
 318
 319 static UINT *find_conversion_shift(struct wined3d_buffer *This,
 320         const struct wined3d_stream_info *strided, UINT stride)
 321 {
 322     UINT *ret, i, j, shift, orig_type_size;
 323
 324     if (!stride)
 325     {
 326         TRACE("No shift\n");
 327         return NULL;
 328     }
 329
 330     This->conversion_stride = stride;
 331     ret = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DWORD) * stride);
 332     for (i = 0; i < MAX_ATTRIBS; ++i)
 333     {
 334         WINED3DFORMAT format;
 335
 336         if (!(strided->use_map & (1 << i)) || strided->elements[i].buffer_object != This->buffer_object) continue;
 337
 338         format = strided->elements[i].format_desc->format;
 339         if (format == WINED3DFMT_R16G16_FLOAT)
 340         {
 341             shift = 4;
 342         }
 343         else if (format == WINED3DFMT_R16G16B16A16_FLOAT)
 344         {
 345             shift = 8;
 346             /* Pre-shift the last 4 bytes in the FLOAT16_4 by 4 bytes - this makes FLOAT16_2 and FLOAT16_4 conversions
 347              * compatible
 348              */
 349             for (j = 4; j < 8; ++j)
 350             {
 351                 ret[(DWORD_PTR)strided->elements[i].data + j] += 4;
 352             }
 353         }
 354         else
 355         {
 356             shift = 0;
 357         }
 358         This->conversion_stride += shift;
 359
 360         if (shift)
 361         {
 362             orig_type_size = strided->elements[i].format_desc->component_count
 363                     * strided->elements[i].format_desc->component_size;
 364             for (j = (DWORD_PTR)strided->elements[i].data + orig_type_size; j < stride; ++j)
 365             {
 366                 ret[j] += shift;
 367             }
 368         }
 369     }
 370
 371     if (TRACE_ON(d3d))
 372     {
 373         TRACE("Dumping conversion shift:\n");
 374         for (i = 0; i < stride; ++i)
 375         {
 376             TRACE("[%d]", ret[i]);
 377         }
 378         TRACE("\n");
 379     }
 380
 381     return ret;
 382 }
 383
 384 static BOOL buffer_find_decl(struct wined3d_buffer *This)
 385 {
 386     IWineD3DDeviceImpl *device = This->resource.device;
 387     const struct wined3d_gl_info *gl_info = &device->adapter->gl_info;
 388     const struct wined3d_stream_info *si = &device->strided_streams;
 389     UINT stride_this_run = 0;
 390     BOOL float16_used = FALSE;
 391     BOOL ret = FALSE;
 392     unsigned int i;
 393
 394     /* In d3d7 the vertex buffer declaration NEVER changes because it is stored in the d3d7 vertex buffer.
 395      * Once we have our declaration there is no need to look it up again. Index buffers also never need
 396      * conversion, so once the (empty) conversion structure is created don't bother checking again
 397      */
 398     if (This->flags & WINED3D_BUFFER_HASDESC)
 399     {
 400         if(This->resource.usage & WINED3DUSAGE_STATICDECL) return FALSE;
 401     }
 402
 403     TRACE("Finding vertex buffer conversion information\n");
 404     /* Certain declaration types need some fixups before we can pass them to
 405      * opengl. This means D3DCOLOR attributes with fixed function vertex
 406      * processing, FLOAT4 POSITIONT with fixed function, and FLOAT16 if
 407      * GL_ARB_half_float_vertex is not supported.
 408      *
 409      * Note for d3d8 and d3d9:
 410      * The vertex buffer FVF doesn't help with finding them, we have to use
 411      * the decoded vertex declaration and pick the things that concern the
 412      * current buffer. A problem with this is that this can change between
 413      * draws, so we have to validate the information and reprocess the buffer
 414      * if it changes, and avoid false positives for performance reasons.
 415      * WineD3D doesn't even know the vertex buffer any more, it is managed
 416      * by the client libraries and passed to SetStreamSource and ProcessVertices
 417      * as needed.
 418      *
 419      * We have to distinguish between vertex shaders and fixed function to
 420      * pick the way we access the strided vertex information.
 421      *
 422      * This code sets up a per-byte array with the size of the detected
 423      * stride of the arrays in the buffer. For each byte we have a field
 424      * that marks the conversion needed on this byte. For example, the
 425      * following declaration with fixed function vertex processing:
 426      *
 427      *      POSITIONT, FLOAT4
 428      *      NORMAL, FLOAT3
 429      *      DIFFUSE, FLOAT16_4
 430      *      SPECULAR, D3DCOLOR
 431      *
 432      * Will result in
 433      * {                 POSITIONT                    }{             NORMAL                }{    DIFFUSE          }{SPECULAR }
 434      * [P][P][P][P][P][P][P][P][P][P][P][P][P][P][P][P][0][0][0][0][0][0][0][0][0][0][0][0][F][F][F][F][F][F][F][F][C][C][C][C]
 435      *
 436      * Where in this example map P means 4 component position conversion, 0
 437      * means no conversion, F means FLOAT16_2 conversion and C means D3DCOLOR
 438      * conversion (red / blue swizzle).
 439      *
 440      * If we're doing conversion and the stride changes we have to reconvert
 441      * the whole buffer. Note that we do not mind if the semantic changes,
 442      * we only care for the conversion type. So if the NORMAL is replaced
 443      * with a TEXCOORD, nothing has to be done, or if the DIFFUSE is replaced
 444      * with a D3DCOLOR BLENDWEIGHT we can happily dismiss the change. Some
 445      * conversion types depend on the semantic as well, for example a FLOAT4
 446      * texcoord needs no conversion while a FLOAT4 positiont needs one
 447      */
 448     if (use_vs(device->stateBlock))
 449     {
 450         TRACE("vshader\n");
 451         /* If the current vertex declaration is marked for no half float conversion don't bother to
 452          * analyse the strided streams in depth, just set them up for no conversion. Return decl changed
 453          * if we used conversion before
 454          */
 455         if (!((IWineD3DVertexDeclarationImpl *) device->stateBlock->vertexDecl)->half_float_conv_needed)
 456         {
 457             if (This->conversion_map)
 458             {
 459                 TRACE("Now using shaders without conversion, but conversion used before\n");
 460                 HeapFree(GetProcessHeap(), 0, This->conversion_map);
 461                 HeapFree(GetProcessHeap(), 0, This->conversion_shift);
 462                 This->conversion_map = NULL;
 463                 This->stride = 0;
 464                 This->conversion_shift = NULL;
 465                 This->conversion_stride = 0;
 466                 return TRUE;
 467             }
 468             else
 469             {
 470                 return FALSE;
 471             }
 472         }
 473         for (i = 0; i < MAX_ATTRIBS; ++i)
 474         {
 475             ret = buffer_check_attribute(This, si, i, FALSE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 476         }
 477
 478         /* Recalculate the conversion shift map if the declaration has changed,
 479          * and we're using float16 conversion or used it on the last run
 480          */
 481         if (ret && (float16_used || This->conversion_map))
 482         {
 483             HeapFree(GetProcessHeap(), 0, This->conversion_shift);
 484             This->conversion_shift = find_conversion_shift(This, si, This->stride);
 485         }
 486     }
 487     else
 488     {
 489         /* Fixed function is a bit trickier. We have to take care for D3DCOLOR types, FLOAT4 positions and of course
 490          * FLOAT16s if not supported. Also, we can't iterate over the array, so use macros to generate code for all
 491          * the attributes that our current fixed function pipeline implementation cares for.
 492          */
 493         BOOL support_d3dcolor = gl_info->supported[ARB_VERTEX_ARRAY_BGRA];
 494         ret = buffer_check_attribute(This, si, WINED3D_FFP_POSITION,
 495                 TRUE, TRUE,  FALSE, &stride_this_run, &float16_used) || ret;
 496         ret = buffer_check_attribute(This, si, WINED3D_FFP_NORMAL,
 497                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 498         ret = buffer_check_attribute(This, si, WINED3D_FFP_DIFFUSE,
 499                 !support_d3dcolor, FALSE, TRUE,  &stride_this_run, &float16_used) || ret;
 500         ret = buffer_check_attribute(This, si, WINED3D_FFP_SPECULAR,
 501                 !support_d3dcolor, FALSE, TRUE,  &stride_this_run, &float16_used) || ret;
 502         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD0,
 503                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 504         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD1,
 505                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 506         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD2,
 507                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 508         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD3,
 509                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 510         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD4,
 511                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 512         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD5,
 513                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 514         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD6,
 515                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 516         ret = buffer_check_attribute(This, si, WINED3D_FFP_TEXCOORD7,
 517                 TRUE, FALSE, FALSE, &stride_this_run, &float16_used) || ret;
 518
 519         if (float16_used) FIXME("Float16 conversion used with fixed function vertex processing\n");
 520     }
 521
 522     if (stride_this_run == 0 && This->conversion_map)
 523     {
 524         /* Sanity test */
 525         if (!ret) ERR("no converted attributes found, old conversion map exists, and no declaration change?\n");
 526         HeapFree(GetProcessHeap(), 0, This->conversion_map);
 527         This->conversion_map = NULL;
 528         This->stride = 0;
 529     }
 530
 531     if (ret) TRACE("Conversion information changed\n");
 532
 533     return ret;
 534 }
 535
 536 /* Context activation is done by the caller. */
 537 static void buffer_check_buffer_object_size(struct wined3d_buffer *This)
 538 {
 539     UINT size = This->conversion_stride ?
 540             This->conversion_stride * (This->resource.size / This->stride) : This->resource.size;
 541     if (This->buffer_object_size != size)
 542     {
 543         TRACE("Old size %u, creating new size %u\n", This->buffer_object_size, size);
 544
 545         if(This->buffer_type_hint == GL_ELEMENT_ARRAY_BUFFER_ARB)
 546         {
 547             IWineD3DDeviceImpl_MarkStateDirty(This->resource.device, STATE_INDEXBUFFER);
 548         }
 549
 550         /* Rescue the data before resizing the buffer object if we do not have our backup copy */
 551         if(!(This->flags & WINED3D_BUFFER_DOUBLEBUFFER))
 552         {
 553             buffer_get_sysmem(This);
 554         }
 555
 556         ENTER_GL();
 557         GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
 558         checkGLcall("glBindBufferARB");
 559         GL_EXTCALL(glBufferDataARB(This->buffer_type_hint, size, NULL, This->buffer_object_usage));
 560         This->buffer_object_size = size;
 561         checkGLcall("glBufferDataARB");
 562         LEAVE_GL();
 563     }
 564 }
 565
 566 static inline void fixup_d3dcolor(DWORD *dst_color)
 567 {
 568     DWORD src_color = *dst_color;
 569
 570     /* Color conversion like in drawStridedSlow. watch out for little endianity
 571      * If we want that stuff to work on big endian machines too we have to consider more things
 572      *
 573      * 0xff000000: Alpha mask
 574      * 0x00ff0000: Blue mask
 575      * 0x0000ff00: Green mask
 576      * 0x000000ff: Red mask
 577      */
 578     *dst_color = 0;
 579     *dst_color |= (src_color & 0xff00ff00);         /* Alpha Green */
 580     *dst_color |= (src_color & 0x00ff0000) >> 16;   /* Red */
 581     *dst_color |= (src_color & 0x000000ff) << 16;   /* Blue */
 582 }
 583
 584 static inline void fixup_transformed_pos(float *p)
 585 {
 586     /* rhw conversion like in position_float4(). */
 587     if (p[3] != 1.0f && p[3] != 0.0f)
 588     {
 589         float w = 1.0f / p[3];
 590         p[0] *= w;
 591         p[1] *= w;
 592         p[2] *= w;
 593         p[3] = w;
 594     }
 595 }
 596
 597 /* Context activation is done by the caller. */
 598 const BYTE *buffer_get_memory(IWineD3DBuffer *iface, UINT offset, GLuint *buffer_object)
 599 {
 600     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
 601
 602     *buffer_object = This->buffer_object;
 603     if (!This->buffer_object)
 604     {
 605         if (This->flags & WINED3D_BUFFER_CREATEBO)
 606         {
 607             buffer_create_buffer_object(This);
 608             This->flags &= ~WINED3D_BUFFER_CREATEBO;
 609             if (This->buffer_object)
 610             {
 611                 *buffer_object = This->buffer_object;
 612                 return (const BYTE *)offset;
 613             }
 614         }
 615         return This->resource.allocatedMemory + offset;
 616     }
 617     else
 618     {
 619         return (const BYTE *)offset;
 620     }
 621 }
 622
 623 /* IUnknown methods */
 624
 625 static HRESULT STDMETHODCALLTYPE buffer_QueryInterface(IWineD3DBuffer *iface,
 626         REFIID riid, void **object)
 627 {
 628     TRACE("iface %p, riid %s, object %p\n", iface, debugstr_guid(riid), object);
 629
 630     if (IsEqualGUID(riid, &IID_IWineD3DBuffer)
 631             || IsEqualGUID(riid, &IID_IWineD3DResource)
 632             || IsEqualGUID(riid, &IID_IWineD3DBase)
 633             || IsEqualGUID(riid, &IID_IUnknown))
 634     {
 635         IUnknown_AddRef(iface);
 636         *object = iface;
 637         return S_OK;
 638     }
 639
 640     WARN("%s not implemented, returning E_NOINTERFACE\n", debugstr_guid(riid));
 641
 642     *object = NULL;
 643
 644     return E_NOINTERFACE;
 645 }
 646
 647 static ULONG STDMETHODCALLTYPE buffer_AddRef(IWineD3DBuffer *iface)
 648 {
 649     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
 650     ULONG refcount = InterlockedIncrement(&This->resource.ref);
 651
 652     TRACE("%p increasing refcount to %u\n", This, refcount);
 653
 654     return refcount;
 655 }
 656
 657 /* Context activation is done by the caller. */
 658 BYTE *buffer_get_sysmem(struct wined3d_buffer *This)
 659 {
 660     /* AllocatedMemory exists if the buffer is double buffered or has no buffer object at all */
 661     if(This->resource.allocatedMemory) return This->resource.allocatedMemory;
 662
 663     This->resource.heapMemory = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, This->resource.size + RESOURCE_ALIGNMENT);
 664     This->resource.allocatedMemory = (BYTE *)(((ULONG_PTR)This->resource.heapMemory + (RESOURCE_ALIGNMENT - 1)) & ~(RESOURCE_ALIGNMENT - 1));
 665     ENTER_GL();
 666     GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
 667     GL_EXTCALL(glGetBufferSubDataARB(This->buffer_type_hint, 0, This->resource.size, This->resource.allocatedMemory));
 668     LEAVE_GL();
 669     This->flags |= WINED3D_BUFFER_DOUBLEBUFFER;
 670
 671     return This->resource.allocatedMemory;
 672 }
 673
 674 static void STDMETHODCALLTYPE buffer_UnLoad(IWineD3DBuffer *iface)
 675 {
 676     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
 677
 678     TRACE("iface %p\n", iface);
 679
 680     if (This->buffer_object)
 681     {
 682         IWineD3DDeviceImpl *device = This->resource.device;
 683         struct wined3d_context *context;
 684
 685         context = context_acquire(device, NULL, CTXUSAGE_RESOURCELOAD);
 686
 687         /* Download the buffer, but don't permanently enable double buffering */
 688         if(!(This->flags & WINED3D_BUFFER_DOUBLEBUFFER))
 689         {
 690             buffer_get_sysmem(This);
 691             This->flags &= ~WINED3D_BUFFER_DOUBLEBUFFER;
 692         }
 693
 694         ENTER_GL();
 695         GL_EXTCALL(glDeleteBuffersARB(1, &This->buffer_object));
 696         checkGLcall("glDeleteBuffersARB");
 697         LEAVE_GL();
 698         This->buffer_object = 0;
 699         This->flags |= WINED3D_BUFFER_CREATEBO; /* Recreate the buffer object next load */
 700         buffer_clear_dirty_areas(This);
 701
 702         context_release(context);
 703
 704         HeapFree(GetProcessHeap(), 0, This->conversion_shift);
 705         This->conversion_shift = NULL;
 706         HeapFree(GetProcessHeap(), 0, This->conversion_map);
 707         This->conversion_map = NULL;
 708         This->stride = 0;
 709         This->conversion_stride = 0;
 710         This->flags &= ~WINED3D_BUFFER_HASDESC;
 711     }
 712 }
 713
 714 static ULONG STDMETHODCALLTYPE buffer_Release(IWineD3DBuffer *iface)
 715 {
 716     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
 717     ULONG refcount = InterlockedDecrement(&This->resource.ref);
 718
 719     TRACE("%p decreasing refcount to %u\n", This, refcount);
 720
 721     if (!refcount)
 722     {
 723         buffer_UnLoad(iface);
 724         resource_cleanup((IWineD3DResource *)iface);
 725         This->resource.parent_ops->wined3d_object_destroyed(This->resource.parent);
 726         HeapFree(GetProcessHeap(), 0, This->maps);
 727         HeapFree(GetProcessHeap(), 0, This);
 728     }
 729
 730     return refcount;
 731 }
 732
 733 /* IWineD3DBase methods */
 734
 735 static HRESULT STDMETHODCALLTYPE buffer_GetParent(IWineD3DBuffer *iface, IUnknown **parent)
 736 {
 737     return resource_get_parent((IWineD3DResource *)iface, parent);
 738 }
 739
 740 /* IWineD3DResource methods */
 741
 742 static HRESULT STDMETHODCALLTYPE buffer_SetPrivateData(IWineD3DBuffer *iface,
 743         REFGUID guid, const void *data, DWORD data_size, DWORD flags)
 744 {
 745     return resource_set_private_data((IWineD3DResource *)iface, guid, data, data_size, flags);
 746 }
 747
 748 static HRESULT STDMETHODCALLTYPE buffer_GetPrivateData(IWineD3DBuffer *iface,
 749         REFGUID guid, void *data, DWORD *data_size)
 750 {
 751     return resource_get_private_data((IWineD3DResource *)iface, guid, data, data_size);
 752 }
 753
 754 static HRESULT STDMETHODCALLTYPE buffer_FreePrivateData(IWineD3DBuffer *iface, REFGUID guid)
 755 {
 756     return resource_free_private_data((IWineD3DResource *)iface, guid);
 757 }
 758
 759 static DWORD STDMETHODCALLTYPE buffer_SetPriority(IWineD3DBuffer *iface, DWORD priority)
 760 {
 761     return resource_set_priority((IWineD3DResource *)iface, priority);
 762 }
 763
 764 static DWORD STDMETHODCALLTYPE buffer_GetPriority(IWineD3DBuffer *iface)
 765 {
 766     return resource_get_priority((IWineD3DResource *)iface);
 767 }
 768
 769 static void STDMETHODCALLTYPE buffer_PreLoad(IWineD3DBuffer *iface)
 770 {
 771     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
 772     IWineD3DDeviceImpl *device = This->resource.device;
 773     UINT start = 0, end = 0, len = 0, vertices;
 774     struct wined3d_context *context;
 775     BOOL decl_changed = FALSE;
 776     unsigned int i, j;
 777     BYTE *data;
 778
 779     TRACE("iface %p\n", iface);
 780
 781     context = context_acquire(device, NULL, CTXUSAGE_RESOURCELOAD);
 782
 783     if (!This->buffer_object)
 784     {
 785         /* TODO: Make converting independent from VBOs */
 786         if (This->flags & WINED3D_BUFFER_CREATEBO)
 787         {
 788             buffer_create_buffer_object(This);
 789             This->flags &= ~WINED3D_BUFFER_CREATEBO;
 790         }
 791         else
 792         {
 793             /* Not doing any conversion */
 794             goto end;
 795         }
 796     }
 797
 798     /* Reading the declaration makes only sense if the stateblock is finalized and the buffer bound to a stream */
 799     if (device->isInDraw && This->bind_count > 0)
 800     {
 801         decl_changed = buffer_find_decl(This);
 802         This->flags |= WINED3D_BUFFER_HASDESC;
 803     }
 804
 805     if (!decl_changed && !(This->flags & WINED3D_BUFFER_HASDESC && buffer_is_dirty(This)))
 806     {
 807         context_release(context);
 808         ++This->draw_count;
 809         if (This->draw_count > VB_RESETDECLCHANGE) This->decl_change_count = 0;
 810         if (This->draw_count > VB_RESETFULLCONVS) This->full_conversion_count = 0;
 811         return;
 812     }
 813
 814     /* If applications change the declaration over and over, reconverting all the time is a huge
 815      * performance hit. So count the declaration changes and release the VBO if there are too many
 816      * of them (and thus stop converting)
 817      */
 818     if (decl_changed)
 819     {
 820         ++This->decl_change_count;
 821         This->draw_count = 0;
 822
 823         if (This->decl_change_count > VB_MAXDECLCHANGES ||
 824             (This->conversion_map && (This->resource.usage & WINED3DUSAGE_DYNAMIC)))
 825         {
 826             FIXME("Too many declaration changes or converting dynamic buffer, stopping converting\n");
 827
 828             IWineD3DBuffer_UnLoad(iface);
 829             This->flags &= ~WINED3D_BUFFER_CREATEBO;
 830
 831             /* The stream source state handler might have read the memory of the vertex buffer already
 832              * and got the memory in the vbo which is not valid any longer. Dirtify the stream source
 833              * to force a reload. This happens only once per changed vertexbuffer and should occur rather
 834              * rarely
 835              */
 836             IWineD3DDeviceImpl_MarkStateDirty(device, STATE_STREAMSRC);
 837             goto end;
 838         }
 839         buffer_check_buffer_object_size(This);
 840     }
 841     else
 842     {
 843         /* However, it is perfectly fine to change the declaration every now and then. We don't want a game that
 844          * changes it every minute drop the VBO after VB_MAX_DECL_CHANGES minutes. So count draws without
 845          * decl changes and reset the decl change count after a specific number of them
 846          */
 847         if(buffer_is_fully_dirty(This))
 848         {
 849             ++This->full_conversion_count;
 850             if(This->full_conversion_count > VB_MAXFULLCONVERSIONS)
 851             {
 852                 FIXME("Too many full buffer conversions, stopping converting\n");
 853                 IWineD3DBuffer_UnLoad(iface);
 854                 This->flags &= ~WINED3D_BUFFER_CREATEBO;
 855                 IWineD3DDeviceImpl_MarkStateDirty(device, STATE_STREAMSRC);
 856                 goto end;
 857             }
 858         }
 859         else
 860         {
 861             ++This->draw_count;
 862             if (This->draw_count > VB_RESETDECLCHANGE) This->decl_change_count = 0;
 863             if (This->draw_count > VB_RESETFULLCONVS) This->full_conversion_count = 0;
 864         }
 865     }
 866
 867     if (decl_changed)
 868     {
 869         /* The declaration changed, reload the whole buffer */
 870         WARN("Reloading buffer because of decl change\n");
 871         buffer_clear_dirty_areas(This);
 872         if(!buffer_add_dirty_area(This, 0, 0))
 873         {
 874             ERR("buffer_add_dirty_area failed, this is not expected\n");
 875             return;
 876         }
 877     }
 878
 879     if(This->buffer_type_hint == GL_ELEMENT_ARRAY_BUFFER_ARB)
 880     {
 881         IWineD3DDeviceImpl_MarkStateDirty(This->resource.device, STATE_INDEXBUFFER);
 882     }
 883
 884     if (!This->conversion_map)
 885     {
 886         /* That means that there is nothing to fixup. Just upload from This->resource.allocatedMemory
 887          * directly into the vbo. Do not free the system memory copy because drawPrimitive may need it if
 888          * the stride is 0, for instancing emulation, vertex blending emulation or shader emulation.
 889          */
 890         TRACE("No conversion needed\n");
 891
 892         /* Nothing to do because we locked directly into the vbo */
 893         if (!(This->flags & WINED3D_BUFFER_DOUBLEBUFFER))
 894         {
 895             context_release(context);
 896             return;
 897         }
 898
 899         ENTER_GL();
 900         GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
 901         checkGLcall("glBindBufferARB");
 902         while(This->modified_areas)
 903         {
 904             This->modified_areas--;
 905             start = This->maps[This->modified_areas].offset;
 906             len = This->maps[This->modified_areas].size;
 907             GL_EXTCALL(glBufferSubDataARB(This->buffer_type_hint, start, len, This->resource.allocatedMemory + start));
 908             checkGLcall("glBufferSubDataARB");
 909         }
 910         LEAVE_GL();
 911
 912         context_release(context);
 913         return;
 914     }
 915
 916     if(!(This->flags & WINED3D_BUFFER_DOUBLEBUFFER))
 917     {
 918         buffer_get_sysmem(This);
 919     }
 920
 921     /* Now for each vertex in the buffer that needs conversion */
 922     vertices = This->resource.size / This->stride;
 923
 924     if (This->conversion_shift)
 925     {
 926         TRACE("Shifted conversion\n");
 927         data = HeapAlloc(GetProcessHeap(), 0, vertices * This->conversion_stride);
 928
 929         start = 0;
 930         len = This->resource.size;
 931         end = start + len;
 932
 933         if (This->maps[0].offset || This->maps[0].size != This->resource.size)
 934         {
 935             FIXME("Implement partial buffer load with shifted conversion\n");
 936         }
 937
 938         for (i = start / This->stride; i < min((end / This->stride) + 1, vertices); ++i)
 939         {
 940             for (j = 0; j < This->stride; ++j)
 941             {
 942                 switch(This->conversion_map[j])
 943                 {
 944                     case CONV_NONE:
 945                         data[This->conversion_stride * i + j + This->conversion_shift[j]]
 946                                 = This->resource.allocatedMemory[This->stride * i + j];
 947                         break;
 948
 949                     case CONV_FLOAT16_2:
 950                     {
 951                         float *out = (float *)(&data[This->conversion_stride * i + j + This->conversion_shift[j]]);
 952                         const WORD *in = (WORD *)(&This->resource.allocatedMemory[i * This->stride + j]);
 953
 954                         out[1] = float_16_to_32(in + 1);
 955                         out[0] = float_16_to_32(in + 0);
 956                         j += 3;    /* Skip 3 additional bytes,as a FLOAT16_2 has 4 bytes */
 957                         break;
 958                     }
 959
 960                     default:
 961                         FIXME("Unimplemented conversion %d in shifted conversion\n", This->conversion_map[j]);
 962                         break;
 963                 }
 964             }
 965         }
 966
 967         ENTER_GL();
 968         GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
 969         checkGLcall("glBindBufferARB");
 970         GL_EXTCALL(glBufferSubDataARB(This->buffer_type_hint, 0, vertices * This->conversion_stride, data));
 971         checkGLcall("glBufferSubDataARB");
 972         LEAVE_GL();
 973     }
 974     else
 975     {
 976         data = HeapAlloc(GetProcessHeap(), 0, This->resource.size);
 977
 978         while(This->modified_areas)
 979         {
 980             This->modified_areas--;
 981             start = This->maps[This->modified_areas].offset;
 982             len = This->maps[This->modified_areas].size;
 983             end = start + len;
 984
 985             memcpy(data + start, This->resource.allocatedMemory + start, end - start);
 986             for (i = start / This->stride; i < min((end / This->stride) + 1, vertices); ++i)
 987             {
 988                 for (j = 0; j < This->stride; ++j)
 989                 {
 990                     switch(This->conversion_map[j])
 991                     {
 992                         case CONV_NONE:
 993                             /* Done already */
 994                             j += 3;
 995                             break;
 996                         case CONV_D3DCOLOR:
 997                             fixup_d3dcolor((DWORD *) (data + i * This->stride + j));
 998                             j += 3;
 999                             break;
1000
1001                         case CONV_POSITIONT:
1002                             fixup_transformed_pos((float *) (data + i * This->stride + j));
1003                             j += 15;
1004                             break;
1005
1006                         case CONV_FLOAT16_2:
1007                             ERR("Did not expect FLOAT16 conversion in unshifted conversion\n");
1008                         default:
1009                             FIXME("Unimplemented conversion %d in shifted conversion\n", This->conversion_map[j]);
1010                     }
1011                 }
1012             }
1013
1014             ENTER_GL();
1015             GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
1016             checkGLcall("glBindBufferARB");
1017             GL_EXTCALL(glBufferSubDataARB(This->buffer_type_hint, start, len, data + start));
1018             checkGLcall("glBufferSubDataARB");
1019             LEAVE_GL();
1020         }
1021     }
1022
1023     HeapFree(GetProcessHeap(), 0, data);
1024
1025 end:
1026     context_release(context);
1027 }
1028
1029 static WINED3DRESOURCETYPE STDMETHODCALLTYPE buffer_GetType(IWineD3DBuffer *iface)
1030 {
1031     return resource_get_type((IWineD3DResource *)iface);
1032 }
1033
1034 /* IWineD3DBuffer methods */
1035
1036 static DWORD buffer_sanitize_flags(DWORD flags)
1037 {
1038     /* Not all flags make sense together, but Windows never returns an error. Catch the
1039      * cases that could cause issues */
1040     if(flags & WINED3DLOCK_READONLY)
1041     {
1042         if(flags & WINED3DLOCK_DISCARD)
1043         {
1044             WARN("WINED3DLOCK_READONLY combined with WINED3DLOCK_DISCARD, ignoring flags\n");
1045             return 0;
1046         }
1047         if(flags & WINED3DLOCK_NOOVERWRITE)
1048         {
1049             WARN("WINED3DLOCK_READONLY combined with WINED3DLOCK_NOOVERWRITE, ignoring flags\n");
1050             return 0;
1051         }
1052     }
1053     else if((flags & (WINED3DLOCK_DISCARD | WINED3DLOCK_NOOVERWRITE)) == (WINED3DLOCK_DISCARD | WINED3DLOCK_NOOVERWRITE))
1054     {
1055         WARN("WINED3DLOCK_DISCARD and WINED3DLOCK_NOOVERWRITE used together, ignoring\n");
1056         return 0;
1057     }
1058
1059     return flags;
1060 }
1061
1062 static GLbitfield buffer_gl_map_flags(DWORD d3d_flags)
1063 {
1064     GLbitfield ret = GL_MAP_FLUSH_EXPLICIT_BIT;
1065
1066     if (!(d3d_flags & WINED3DLOCK_READONLY)) ret |= GL_MAP_WRITE_BIT;
1067
1068     if (d3d_flags & (WINED3DLOCK_DISCARD | WINED3DLOCK_NOOVERWRITE))
1069     {
1070         if(d3d_flags & WINED3DLOCK_DISCARD) ret |= GL_MAP_INVALIDATE_BUFFER_BIT;
1071         ret |= GL_MAP_UNSYNCHRONIZED_BIT;
1072     }
1073     else
1074     {
1075         ret |= GL_MAP_READ_BIT;
1076     }
1077
1078     return ret;
1079 }
1080
1081 static HRESULT STDMETHODCALLTYPE buffer_Map(IWineD3DBuffer *iface, UINT offset, UINT size, BYTE **data, DWORD flags)
1082 {
1083     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
1084     LONG count;
1085
1086     TRACE("iface %p, offset %u, size %u, data %p, flags %#x\n", iface, offset, size, data, flags);
1087
1088     flags = buffer_sanitize_flags(flags);
1089     if (!buffer_add_dirty_area(This, offset, size)) return E_OUTOFMEMORY;
1090
1091     count = InterlockedIncrement(&This->lock_count);
1092
1093     if(!(This->flags & WINED3D_BUFFER_DOUBLEBUFFER) && This->buffer_object)
1094     {
1095         if(count == 1)
1096         {
1097             IWineD3DDeviceImpl *device = This->resource.device;
1098             struct wined3d_context *context;
1099             const struct wined3d_gl_info *gl_info;
1100
1101             if(This->buffer_type_hint == GL_ELEMENT_ARRAY_BUFFER_ARB)
1102             {
1103                 IWineD3DDeviceImpl_MarkStateDirty(This->resource.device, STATE_INDEXBUFFER);
1104             }
1105
1106             context = context_acquire(device, NULL, CTXUSAGE_RESOURCELOAD);
1107             gl_info = context->gl_info;
1108             ENTER_GL();
1109             GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
1110
1111             if (gl_info->supported[ARB_MAP_BUFFER_RANGE])
1112             {
1113                 GLbitfield mapflags = buffer_gl_map_flags(flags);
1114                 This->resource.allocatedMemory = GL_EXTCALL(glMapBufferRange(This->buffer_type_hint, 0,
1115                                                                              This->resource.size, mapflags));
1116             }
1117             else
1118             {
1119                 This->resource.allocatedMemory = GL_EXTCALL(glMapBufferARB(This->buffer_type_hint, GL_READ_WRITE_ARB));
1120             }
1121             LEAVE_GL();
1122             context_release(context);
1123         }
1124     }
1125
1126     *data = This->resource.allocatedMemory + offset;
1127
1128     TRACE("Returning memory at %p (base %p, offset %u)\n", *data, This->resource.allocatedMemory, offset);
1129     /* TODO: check Flags compatibility with This->currentDesc.Usage (see MSDN) */
1130
1131     return WINED3D_OK;
1132 }
1133
1134 static HRESULT STDMETHODCALLTYPE buffer_Unmap(IWineD3DBuffer *iface)
1135 {
1136     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
1137     ULONG i;
1138
1139     TRACE("(%p)\n", This);
1140
1141     /* In the case that the number of Unmap calls > the
1142      * number of Map calls, d3d returns always D3D_OK.
1143      * This is also needed to prevent Map from returning garbage on
1144      * the next call (this will happen if the lock_count is < 0). */
1145     if(This->lock_count == 0)
1146     {
1147         TRACE("Unmap called without a previous Map call!\n");
1148         return WINED3D_OK;
1149     }
1150
1151     if (InterlockedDecrement(&This->lock_count))
1152     {
1153         /* Delay loading the buffer until everything is unlocked */
1154         TRACE("Ignoring unlock\n");
1155         return WINED3D_OK;
1156     }
1157
1158     if(!(This->flags & WINED3D_BUFFER_DOUBLEBUFFER) && This->buffer_object)
1159     {
1160         IWineD3DDeviceImpl *device = This->resource.device;
1161         const struct wined3d_gl_info *gl_info;
1162         struct wined3d_context *context;
1163
1164         if(This->buffer_type_hint == GL_ELEMENT_ARRAY_BUFFER_ARB)
1165         {
1166             IWineD3DDeviceImpl_MarkStateDirty(This->resource.device, STATE_INDEXBUFFER);
1167         }
1168
1169         context = context_acquire(device, NULL, CTXUSAGE_RESOURCELOAD);
1170         gl_info = context->gl_info;
1171         ENTER_GL();
1172         GL_EXTCALL(glBindBufferARB(This->buffer_type_hint, This->buffer_object));
1173
1174         if (gl_info->supported[ARB_MAP_BUFFER_RANGE])
1175         {
1176             for(i = 0; i < This->modified_areas; i++)
1177             {
1178                 GL_EXTCALL(glFlushMappedBufferRange(This->buffer_type_hint,
1179                                                     This->maps[i].offset,
1180                                                     This->maps[i].size));
1181                 checkGLcall("glFlushMappedBufferRange");
1182             }
1183         }
1184         else if (This->flags & WINED3D_BUFFER_FLUSH)
1185         {
1186             for(i = 0; i < This->modified_areas; i++)
1187             {
1188                 GL_EXTCALL(glFlushMappedBufferRangeAPPLE(This->buffer_type_hint,
1189                                                          This->maps[i].offset,
1190                                                          This->maps[i].size));
1191                 checkGLcall("glFlushMappedBufferRangeAPPLE");
1192             }
1193         }
1194
1195         GL_EXTCALL(glUnmapBufferARB(This->buffer_type_hint));
1196         LEAVE_GL();
1197         context_release(context);
1198
1199         This->resource.allocatedMemory = NULL;
1200         buffer_clear_dirty_areas(This);
1201     }
1202     else if (This->flags & WINED3D_BUFFER_HASDESC)
1203     {
1204         buffer_PreLoad(iface);
1205     }
1206
1207     return WINED3D_OK;
1208 }
1209
1210 static HRESULT STDMETHODCALLTYPE buffer_GetDesc(IWineD3DBuffer *iface, WINED3DBUFFER_DESC *desc)
1211 {
1212     struct wined3d_buffer *This = (struct wined3d_buffer *)iface;
1213
1214     TRACE("(%p)\n", This);
1215
1216     desc->Type = This->resource.resourceType;
1217     desc->Usage = This->resource.usage;
1218     desc->Pool = This->resource.pool;
1219     desc->Size = This->resource.size;
1220
1221     return WINED3D_OK;
1222 }
1223
1224 static const struct IWineD3DBufferVtbl wined3d_buffer_vtbl =
1225 {
1226     /* IUnknown methods */
1227     buffer_QueryInterface,
1228     buffer_AddRef,
1229     buffer_Release,
1230     /* IWineD3DBase methods */
1231     buffer_GetParent,
1232     /* IWineD3DResource methods */
1233     buffer_SetPrivateData,
1234     buffer_GetPrivateData,
1235     buffer_FreePrivateData,
1236     buffer_SetPriority,
1237     buffer_GetPriority,
1238     buffer_PreLoad,
1239     buffer_UnLoad,
1240     buffer_GetType,
1241     /* IWineD3DBuffer methods */
1242     buffer_Map,
1243     buffer_Unmap,
1244     buffer_GetDesc,
1245 };
1246
1247 HRESULT buffer_init(struct wined3d_buffer *buffer, IWineD3DDeviceImpl *device,
1248         UINT size, DWORD usage, WINED3DFORMAT format, WINED3DPOOL pool, GLenum bind_hint,
1249         const char *data, IUnknown *parent, const struct wined3d_parent_ops *parent_ops)
1250 {
1251     const struct GlPixelFormatDesc *format_desc = getFormatDescEntry(format, &device->adapter->gl_info);
1252     HRESULT hr;
1253     const struct wined3d_gl_info *gl_info = &device->adapter->gl_info;
1254     BOOL dynamic_buffer_ok;
1255
1256     if (!size)
1257     {
1258         WARN("Size 0 requested, returning WINED3DERR_INVALIDCALL\n");
1259         return WINED3DERR_INVALIDCALL;
1260     }
1261
1262     buffer->vtbl = &wined3d_buffer_vtbl;
1263
1264     hr = resource_init((IWineD3DResource *)buffer, WINED3DRTYPE_BUFFER,
1265             device, size, usage, format_desc, pool, parent, parent_ops);
1266     if (FAILED(hr))
1267     {
1268         WARN("Failed to initialize resource, hr %#x\n", hr);
1269         return hr;
1270     }
1271     buffer->buffer_type_hint = bind_hint;
1272
1273     TRACE("size %#x, usage %#x, format %s, memory @ %p, iface @ %p.\n", buffer->resource.size, buffer->resource.usage,
1274             debug_d3dformat(buffer->resource.format_desc->format), buffer->resource.allocatedMemory, buffer);
1275
1276     dynamic_buffer_ok = gl_info->supported[APPLE_FLUSH_BUFFER_RANGE] || gl_info->supported[ARB_MAP_BUFFER_RANGE];
1277
1278     /* Observations show that drawStridedSlow is faster on dynamic VBs than converting +
1279      * drawStridedFast (half-life 2 and others).
1280      *
1281      * Basically converting the vertices in the buffer is quite expensive, and observations
1282      * show that drawStridedSlow is faster than converting + uploading + drawStridedFast.
1283      * Therefore do not create a VBO for WINED3DUSAGE_DYNAMIC buffers.
1284      */
1285     if (!gl_info->supported[ARB_VERTEX_BUFFER_OBJECT])
1286     {
1287         TRACE("Not creating a vbo because GL_ARB_vertex_buffer is not supported\n");
1288     }
1289     else if(buffer->resource.pool == WINED3DPOOL_SYSTEMMEM)
1290     {
1291         TRACE("Not creating a vbo because the vertex buffer is in system memory\n");
1292     }
1293     else if(!dynamic_buffer_ok && (buffer->resource.usage & WINED3DUSAGE_DYNAMIC))
1294     {
1295         TRACE("Not creating a vbo because the buffer has dynamic usage and no GL support\n");
1296     }
1297     else
1298     {
1299         buffer->flags |= WINED3D_BUFFER_CREATEBO;
1300     }
1301
1302     if (data)
1303     {
1304         BYTE *ptr;
1305
1306         hr = IWineD3DBuffer_Map((IWineD3DBuffer *)buffer, 0, size, &ptr, 0);
1307         if (FAILED(hr))
1308         {
1309             ERR("Failed to map buffer, hr %#x\n", hr);
1310             buffer_UnLoad((IWineD3DBuffer *)buffer);
1311             resource_cleanup((IWineD3DResource *)buffer);
1312             return hr;
1313         }
1314
1315         memcpy(ptr, data, size);
1316
1317         hr = IWineD3DBuffer_Unmap((IWineD3DBuffer *)buffer);
1318         if (FAILED(hr))
1319         {
1320             ERR("Failed to unmap buffer, hr %#x\n", hr);
1321             buffer_UnLoad((IWineD3DBuffer *)buffer);
1322             resource_cleanup((IWineD3DResource *)buffer);
1323             return hr;
1324         }
1325     }
1326
1327     buffer->maps = HeapAlloc(GetProcessHeap(), 0, sizeof(*buffer->maps));
1328     if (!buffer->maps)
1329     {
1330         ERR("Out of memory\n");
1331         buffer_UnLoad((IWineD3DBuffer *)buffer);
1332         resource_cleanup((IWineD3DResource *)buffer);
1333         return E_OUTOFMEMORY;
1334     }
1335     buffer->maps_size = 1;
1336
1337     return WINED3D_OK;
1338 }