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 /* The last used device.
  33  *
  34  * If the application creates multiple devices and switches between them, ActivateContext has to
  35  * change the opengl context. This flag allows to keep track which device is active
  36  */
  37 static IWineD3DDeviceImpl *last_device;
  38
  39 /*****************************************************************************
  40  * Context_MarkStateDirty
  41  *
  42  * Marks a state in a context dirty. Only one context, opposed to
  43  * IWineD3DDeviceImpl_MarkStateDirty, which marks the state dirty in all
  44  * contexts
  45  *
  46  * Params:
  47  *  context: Context to mark the state dirty in
  48  *  state: State to mark dirty
  49  *  StateTable: Pointer to the state table in use(for state grouping)
  50  *
  51  *****************************************************************************/
  52 static void Context_MarkStateDirty(WineD3DContext *context, DWORD state, const struct StateEntry *StateTable) {
  53     DWORD rep = StateTable[state].representative;
  54     DWORD idx;
  55     BYTE shift;
  56
  57     if(!rep || isStateDirty(context, rep)) return;
  58
  59     context->dirtyArray[context->numDirtyEntries++] = rep;
  60     idx = rep >> 5;
  61     shift = rep & 0x1f;
  62     context->isStateDirty[idx] |= (1 << shift);
  63 }
  64
  65 /*****************************************************************************
  66  * AddContextToArray
  67  *
  68  * Adds a context to the context array. Helper function for CreateContext
  69  *
  70  * This method is not called in performance-critical code paths, only when a
  71  * new render target or swapchain is created. Thus performance is not an issue
  72  * here.
  73  *
  74  * Params:
  75  *  This: Device to add the context for
  76  *  hdc: device context
  77  *  glCtx: WGL context to add
  78  *  pbuffer: optional pbuffer used with this context
  79  *
  80  *****************************************************************************/
  81 static WineD3DContext *AddContextToArray(IWineD3DDeviceImpl *This, HWND win_handle, HDC hdc, HGLRC glCtx, HPBUFFERARB pbuffer) {
  82     WineD3DContext **oldArray = This->contexts;
  83     DWORD state;
  84
  85     This->contexts = HeapAlloc(GetProcessHeap(), 0, sizeof(*This->contexts) * (This->numContexts + 1));
  86     if(This->contexts == NULL) {
  87         ERR("Unable to grow the context array\n");
  88         This->contexts = oldArray;
  89         return NULL;
  90     }
  91     if(oldArray) {
  92         memcpy(This->contexts, oldArray, sizeof(*This->contexts) * This->numContexts);
  93     }
  94
  95     This->contexts[This->numContexts] = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(WineD3DContext));
  96     if(This->contexts[This->numContexts] == NULL) {
  97         ERR("Unable to allocate a new context\n");
  98         HeapFree(GetProcessHeap(), 0, This->contexts);
  99         This->contexts = oldArray;
 100         return NULL;
 101     }
 102
 103     This->contexts[This->numContexts]->hdc = hdc;
 104     This->contexts[This->numContexts]->glCtx = glCtx;
 105     This->contexts[This->numContexts]->pbuffer = pbuffer;
 106     This->contexts[This->numContexts]->win_handle = win_handle;
 107     HeapFree(GetProcessHeap(), 0, oldArray);
 108
 109     /* Mark all states dirty to force a proper initialization of the states on the first use of the context
 110      */
 111     for(state = 0; state <= STATE_HIGHEST; state++) {
 112         Context_MarkStateDirty(This->contexts[This->numContexts], state, This->StateTable);
 113     }
 114
 115     This->numContexts++;
 116     TRACE("Created context %p\n", This->contexts[This->numContexts - 1]);
 117     return This->contexts[This->numContexts - 1];
 118 }
 119
 120 /* This function takes care of WineD3D pixel format selection. */
 121 static int WineD3D_ChoosePixelFormat(IWineD3DDeviceImpl *This, HDC hdc, WINED3DFORMAT ColorFormat, WINED3DFORMAT DepthStencilFormat, BOOL auxBuffers, int numSamples, BOOL pbuffer, BOOL findCompatible)
 122 {
 123     int iPixelFormat=0, matchtry;
 124     short redBits, greenBits, blueBits, alphaBits, colorBits;
 125     short depthBits=0, stencilBits=0;
 126
 127     struct match_type {
 128         BOOL require_aux;
 129         BOOL exact_alpha;
 130         BOOL exact_color;
 131     } matches[] = {
 132         /* First, try without alpha match buffers. MacOS supports aux buffers only
 133          * on A8R8G8B8, and we prefer better offscreen rendering over an alpha match.
 134          * Then try without aux buffers - this is the most common cause for not
 135          * finding a pixel format. Also some drivers(the open source ones)
 136          * only offer 32 bit ARB pixel formats. First try without an exact alpha
 137          * match, then try without an exact alpha and color match.
 138          */
 139         { FALSE, TRUE,  TRUE  },
 140         { TRUE,  TRUE,  TRUE  },
 141         { FALSE, FALSE, TRUE  },
 142         { FALSE, FALSE, FALSE },
 143         { TRUE,  FALSE, TRUE  },
 144         { TRUE,  FALSE, FALSE },
 145     };
 146
 147     int i = 0;
 148     int nCfgs = This->adapter->nCfgs;
 149     WineD3D_PixelFormat *cfgs = This->adapter->cfgs;
 150
 151     TRACE("ColorFormat=%s, DepthStencilFormat=%s, auxBuffers=%d, numSamples=%d, pbuffer=%d, findCompatible=%d\n",
 152           debug_d3dformat(ColorFormat), debug_d3dformat(DepthStencilFormat), auxBuffers, numSamples, pbuffer, findCompatible);
 153
 154     if(!getColorBits(ColorFormat, &redBits, &greenBits, &blueBits, &alphaBits, &colorBits)) {
 155         ERR("Unable to get color bits for format %s (%#x)!\n", debug_d3dformat(ColorFormat), ColorFormat);
 156         return 0;
 157     }
 158
 159     /* In WGL both color, depth and stencil are features of a pixel format. In case of D3D they are separate.
 160      * You are able to add a depth + stencil surface at a later stage when you need it.
 161      * In order to support this properly in WineD3D we need the ability to recreate the opengl context and
 162      * drawable when this is required. This is very tricky as we need to reapply ALL opengl states for the new
 163      * context, need torecreate shaders, textures and other resources.
 164      *
 165      * The context manager already takes care of the state problem and for the other tasks code from Reset
 166      * can be used. These changes are way to risky during the 1.0 code freeze which is taking place right now.
 167      * Likely a lot of other new bugs will be exposed. For that reason request a depth stencil surface all the
 168      * time. It can cause a slight performance hit but fixes a lot of regressions. A fixme reminds of that this
 169      * issue needs to be fixed. */
 170     if(DepthStencilFormat != WINED3DFMT_D24S8)
 171         FIXME("Add OpenGL context recreation support to SetDepthStencilSurface\n");
 172
 173     DepthStencilFormat = WINED3DFMT_D24S8;
 174
 175     if(DepthStencilFormat) {
 176         getDepthStencilBits(DepthStencilFormat, &depthBits, &stencilBits);
 177     }
 178
 179     for(matchtry = 0; matchtry < (sizeof(matches) / sizeof(matches[0])); matchtry++) {
 180         for(i=0; i<nCfgs; i++) {
 181             BOOL exactDepthMatch = TRUE;
 182             cfgs = &This->adapter->cfgs[i];
 183
 184             /* For now only accept RGBA formats. Perhaps some day we will
 185              * allow floating point formats for pbuffers. */
 186             if(cfgs->iPixelType != WGL_TYPE_RGBA_ARB)
 187                 continue;
 188
 189             /* In window mode (!pbuffer) we need a window drawable format and double buffering. */
 190             if(!pbuffer && !(cfgs->windowDrawable && cfgs->doubleBuffer))
 191                 continue;
 192
 193             /* We like to have aux buffers in backbuffer mode */
 194             if(auxBuffers && !cfgs->auxBuffers && matches[matchtry].require_aux)
 195                 continue;
 196
 197             /* In pbuffer-mode we need a pbuffer-capable format but we don't want double buffering */
 198             if(pbuffer && (!cfgs->pbufferDrawable || cfgs->doubleBuffer))
 199                 continue;
 200
 201             if(matches[matchtry].exact_color) {
 202                 if(cfgs->redSize != redBits)
 203                     continue;
 204                 if(cfgs->greenSize != greenBits)
 205                     continue;
 206                 if(cfgs->blueSize != blueBits)
 207                     continue;
 208             } else {
 209                 if(cfgs->redSize < redBits)
 210                     continue;
 211                 if(cfgs->greenSize < greenBits)
 212                     continue;
 213                 if(cfgs->blueSize < blueBits)
 214                     continue;
 215             }
 216             if(matches[matchtry].exact_alpha) {
 217                 if(cfgs->alphaSize != alphaBits)
 218                     continue;
 219             } else {
 220                 if(cfgs->alphaSize < alphaBits)
 221                     continue;
 222             }
 223
 224             /* We try to locate a format which matches our requirements exactly. In case of
 225              * depth it is no problem to emulate 16-bit using e.g. 24-bit, so accept that. */
 226             if(cfgs->depthSize < depthBits)
 227                 continue;
 228             else if(cfgs->depthSize > depthBits)
 229                 exactDepthMatch = FALSE;
 230
 231             /* In all cases make sure the number of stencil bits matches our requirements
 232              * even when we don't need stencil because it could affect performance EXCEPT
 233              * on cards which don't offer depth formats without stencil like the i915 drivers
 234              * on Linux. */
 235             if(stencilBits != cfgs->stencilSize && !(This->adapter->brokenStencil && stencilBits <= cfgs->stencilSize))
 236                 continue;
 237
 238             /* Check multisampling support */
 239             if(cfgs->numSamples != numSamples)
 240                 continue;
 241
 242             /* When we have passed all the checks then we have found a format which matches our
 243              * requirements. Note that we only check for a limit number of capabilities right now,
 244              * so there can easily be a dozen of pixel formats which appear to be the 'same' but
 245              * can still differ in things like multisampling, stereo, SRGB and other flags.
 246              */
 247
 248             /* Exit the loop as we have found a format :) */
 249             if(exactDepthMatch) {
 250                 iPixelFormat = cfgs->iPixelFormat;
 251                 break;
 252             } else if(!iPixelFormat) {
 253                 /* In the end we might end up with a format which doesn't exactly match our depth
 254                  * requirements. Accept the first format we found because formats with higher iPixelFormat
 255                  * values tend to have more extended capabilities (e.g. multisampling) which we don't need. */
 256                 iPixelFormat = cfgs->iPixelFormat;
 257             }
 258         }
 259     }
 260
 261     /* When findCompatible is set and no suitable format was found, let ChoosePixelFormat choose a pixel format in order not to crash. */
 262     if(!iPixelFormat && !findCompatible) {
 263         ERR("Can't find a suitable iPixelFormat\n");
 264         return FALSE;
 265     } else if(!iPixelFormat) {
 266         PIXELFORMATDESCRIPTOR pfd;
 267
 268         TRACE("Falling back to ChoosePixelFormat as we weren't able to find an exactly matching pixel format\n");
 269         /* PixelFormat selection */
 270         ZeroMemory(&pfd, sizeof(pfd));
 271         pfd.nSize      = sizeof(pfd);
 272         pfd.nVersion   = 1;
 273         pfd.dwFlags    = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW;/*PFD_GENERIC_ACCELERATED*/
 274         pfd.iPixelType = PFD_TYPE_RGBA;
 275         pfd.cAlphaBits = alphaBits;
 276         pfd.cColorBits = colorBits;
 277         pfd.cDepthBits = depthBits;
 278         pfd.cStencilBits = stencilBits;
 279         pfd.iLayerType = PFD_MAIN_PLANE;
 280
 281         iPixelFormat = ChoosePixelFormat(hdc, &pfd);
 282         if(!iPixelFormat) {
 283             /* If this happens something is very wrong as ChoosePixelFormat barely fails */
 284             ERR("Can't find a suitable iPixelFormat\n");
 285             return FALSE;
 286         }
 287     }
 288
 289     TRACE("Found iPixelFormat=%d for ColorFormat=%s, DepthStencilFormat=%s\n", iPixelFormat, debug_d3dformat(ColorFormat), debug_d3dformat(DepthStencilFormat));
 290     return iPixelFormat;
 291 }
 292
 293 /*****************************************************************************
 294  * CreateContext
 295  *
 296  * Creates a new context for a window, or a pbuffer context.
 297  *
 298  * * Params:
 299  *  This: Device to activate the context for
 300  *  target: Surface this context will render to
 301  *  win_handle: handle to the window which we are drawing to
 302  *  create_pbuffer: tells whether to create a pbuffer or not
 303  *  pPresentParameters: contains the pixelformats to use for onscreen rendering
 304  *
 305  *****************************************************************************/
 306 WineD3DContext *CreateContext(IWineD3DDeviceImpl *This, IWineD3DSurfaceImpl *target, HWND win_handle, BOOL create_pbuffer, const WINED3DPRESENT_PARAMETERS *pPresentParms) {
 307     HDC oldDrawable, hdc;
 308     HPBUFFERARB pbuffer = NULL;
 309     HGLRC ctx = NULL, oldCtx;
 310     WineD3DContext *ret = NULL;
 311     int s;
 312
 313     TRACE("(%p): Creating a %s context for render target %p\n", This, create_pbuffer ? "offscreen" : "onscreen", target);
 314
 315     if(create_pbuffer) {
 316         HDC hdc_parent = GetDC(win_handle);
 317         int iPixelFormat = 0;
 318
 319         IWineD3DSurface *StencilSurface = This->stencilBufferTarget;
 320         WINED3DFORMAT StencilBufferFormat = (NULL != StencilSurface) ? ((IWineD3DSurfaceImpl *) StencilSurface)->resource.format : 0;
 321
 322         /* Try to find a pixel format with pbuffer support. */
 323         iPixelFormat = WineD3D_ChoosePixelFormat(This, hdc_parent, target->resource.format, StencilBufferFormat, FALSE /* auxBuffers */, 0 /* numSamples */, TRUE /* PBUFFER */, FALSE /* findCompatible */);
 324         if(!iPixelFormat) {
 325             TRACE("Trying to locate a compatible pixel format because an exact match failed.\n");
 326
 327             /* For some reason we weren't able to find a format, try to find something instead of crashing.
 328              * A reason for failure could have been wglChoosePixelFormatARB strictness. */
 329             iPixelFormat = WineD3D_ChoosePixelFormat(This, hdc_parent, target->resource.format, StencilBufferFormat, FALSE /* auxBuffer */, 0 /* numSamples */, TRUE /* PBUFFER */, TRUE /* findCompatible */);
 330         }
 331
 332         /* This shouldn't happen as ChoosePixelFormat always returns something */
 333         if(!iPixelFormat) {
 334             ERR("Unable to locate a pixel format for a pbuffer\n");
 335             ReleaseDC(win_handle, hdc_parent);
 336             goto out;
 337         }
 338
 339         TRACE("Creating a pBuffer drawable for the new context\n");
 340         pbuffer = GL_EXTCALL(wglCreatePbufferARB(hdc_parent, iPixelFormat, target->currentDesc.Width, target->currentDesc.Height, 0));
 341         if(!pbuffer) {
 342             ERR("Cannot create a pbuffer\n");
 343             ReleaseDC(win_handle, hdc_parent);
 344             goto out;
 345         }
 346
 347         /* In WGL a pbuffer is 'wrapped' inside a HDC to 'fool' wglMakeCurrent */
 348         hdc = GL_EXTCALL(wglGetPbufferDCARB(pbuffer));
 349         if(!hdc) {
 350             ERR("Cannot get a HDC for pbuffer (%p)\n", pbuffer);
 351             GL_EXTCALL(wglDestroyPbufferARB(pbuffer));
 352             ReleaseDC(win_handle, hdc_parent);
 353             goto out;
 354         }
 355         ReleaseDC(win_handle, hdc_parent);
 356     } else {
 357         PIXELFORMATDESCRIPTOR pfd;
 358         int iPixelFormat;
 359         int res;
 360         WINED3DFORMAT ColorFormat = target->resource.format;
 361         WINED3DFORMAT DepthStencilFormat = 0;
 362         BOOL auxBuffers = FALSE;
 363         int numSamples = 0;
 364
 365         hdc = GetDC(win_handle);
 366         if(hdc == NULL) {
 367             ERR("Cannot retrieve a device context!\n");
 368             goto out;
 369         }
 370
 371         /* In case of ORM_BACKBUFFER, make sure to request an alpha component for X4R4G4B4/X8R8G8B8 as we might need it for the backbuffer. */
 372         if(wined3d_settings.offscreen_rendering_mode == ORM_BACKBUFFER) {
 373             auxBuffers = TRUE;
 374
 375             if(target->resource.format == WINED3DFMT_X4R4G4B4)
 376                 ColorFormat = WINED3DFMT_A4R4G4B4;
 377             else if(target->resource.format == WINED3DFMT_X8R8G8B8)
 378                 ColorFormat = WINED3DFMT_A8R8G8B8;
 379         }
 380
 381         /* DirectDraw supports 8bit paletted render targets and these are used by old games like Starcraft and C&C.
 382          * Most modern hardware doesn't support 8bit natively so we perform some form of 8bit -> 32bit conversion.
 383          * The conversion (ab)uses the alpha component for storing the palette index. For this reason we require
 384          * a format with 8bit alpha, so request A8R8G8B8. */
 385         if(ColorFormat == WINED3DFMT_P8)
 386             ColorFormat = WINED3DFMT_A8R8G8B8;
 387
 388         /* Retrieve the depth stencil format from the present parameters.
 389          * The choice of the proper format can give a nice performance boost
 390          * in case of GPU limited programs. */
 391         if(pPresentParms->EnableAutoDepthStencil) {
 392             TRACE("pPresentParms->EnableAutoDepthStencil=enabled; using AutoDepthStencilFormat=%s\n", debug_d3dformat(pPresentParms->AutoDepthStencilFormat));
 393             DepthStencilFormat = pPresentParms->AutoDepthStencilFormat;
 394         }
 395
 396         /* D3D only allows multisampling when SwapEffect is set to WINED3DSWAPEFFECT_DISCARD */
 397         if(pPresentParms->MultiSampleType && (pPresentParms->SwapEffect == WINED3DSWAPEFFECT_DISCARD)) {
 398             if(!GL_SUPPORT(ARB_MULTISAMPLE))
 399                 ERR("The program is requesting multisampling without support!\n");
 400             else {
 401                 ERR("Requesting MultiSampleType=%d\n", pPresentParms->MultiSampleType);
 402                 numSamples = pPresentParms->MultiSampleType;
 403             }
 404         }
 405
 406         /* Try to find a pixel format which matches our requirements */
 407         iPixelFormat = WineD3D_ChoosePixelFormat(This, hdc, ColorFormat, DepthStencilFormat, auxBuffers, numSamples, FALSE /* PBUFFER */, FALSE /* findCompatible */);
 408
 409         /* Try to locate a compatible format if we weren't able to find anything */
 410         if(!iPixelFormat) {
 411             TRACE("Trying to locate a compatible pixel format because an exact match failed.\n");
 412             iPixelFormat = WineD3D_ChoosePixelFormat(This, hdc, ColorFormat, DepthStencilFormat, auxBuffers, 0 /* numSamples */, FALSE /* PBUFFER */, TRUE /* findCompatible */ );
 413         }
 414
 415         /* If we still don't have a pixel format, something is very wrong as ChoosePixelFormat barely fails */
 416         if(!iPixelFormat) {
 417             ERR("Can't find a suitable iPixelFormat\n");
 418             return FALSE;
 419         }
 420
 421         DescribePixelFormat(hdc, iPixelFormat, sizeof(pfd), &pfd);
 422         res = SetPixelFormat(hdc, iPixelFormat, NULL);
 423         if(!res) {
 424             int oldPixelFormat = GetPixelFormat(hdc);
 425
 426             /* By default WGL doesn't allow pixel format adjustments but we need it here.
 427              * For this reason there is a WINE-specific wglSetPixelFormat which allows you to
 428              * set the pixel format multiple times. Only use it when it is really needed. */
 429
 430             if(oldPixelFormat == iPixelFormat) {
 431                 /* We don't have to do anything as the formats are the same :) */
 432             } else if(oldPixelFormat && GL_SUPPORT(WGL_WINE_PIXEL_FORMAT_PASSTHROUGH)) {
 433                 res = GL_EXTCALL(wglSetPixelFormatWINE(hdc, iPixelFormat, NULL));
 434
 435                 if(!res) {
 436                     ERR("wglSetPixelFormatWINE failed on HDC=%p for iPixelFormat=%d\n", hdc, iPixelFormat);
 437                     return FALSE;
 438                 }
 439             } else if(oldPixelFormat) {
 440                 /* OpenGL doesn't allow pixel format adjustments. Print an error and continue using the old format.
 441                  * There's a big chance that the old format works although with a performance hit and perhaps rendering errors. */
 442                 ERR("HDC=%p is already set to iPixelFormat=%d and OpenGL doesn't allow changes!\n", hdc, oldPixelFormat);
 443             } else {
 444                 ERR("SetPixelFormat failed on HDC=%p for iPixelFormat=%d\n", hdc, iPixelFormat);
 445                 return FALSE;
 446             }
 447         }
 448     }
 449
 450     ctx = pwglCreateContext(hdc);
 451     if(This->numContexts) pwglShareLists(This->contexts[0]->glCtx, ctx);
 452
 453     if(!ctx) {
 454         ERR("Failed to create a WGL context\n");
 455         if(create_pbuffer) {
 456             GL_EXTCALL(wglReleasePbufferDCARB(pbuffer, hdc));
 457             GL_EXTCALL(wglDestroyPbufferARB(pbuffer));
 458         }
 459         goto out;
 460     }
 461     ret = AddContextToArray(This, win_handle, hdc, ctx, pbuffer);
 462     if(!ret) {
 463         ERR("Failed to add the newly created context to the context list\n");
 464         pwglDeleteContext(ctx);
 465         if(create_pbuffer) {
 466             GL_EXTCALL(wglReleasePbufferDCARB(pbuffer, hdc));
 467             GL_EXTCALL(wglDestroyPbufferARB(pbuffer));
 468         }
 469         goto out;
 470     }
 471     ret->surface = (IWineD3DSurface *) target;
 472     ret->isPBuffer = create_pbuffer;
 473     ret->tid = GetCurrentThreadId();
 474     if(This->shader_backend->shader_dirtifyable_constants((IWineD3DDevice *) This)) {
 475         /* Create the dirty constants array and initialize them to dirty */
 476         ret->vshader_const_dirty = HeapAlloc(GetProcessHeap(), 0,
 477                 sizeof(*ret->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
 478         ret->pshader_const_dirty = HeapAlloc(GetProcessHeap(), 0,
 479                 sizeof(*ret->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
 480         memset(ret->vshader_const_dirty, 1,
 481                sizeof(*ret->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
 482         memset(ret->pshader_const_dirty, 1,
 483                 sizeof(*ret->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
 484     }
 485
 486     TRACE("Successfully created new context %p\n", ret);
 487
 488     ret->fbo_color_attachments = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IWineD3DSurface *) * GL_LIMITS(buffers));
 489     if (!ret->fbo_color_attachments)
 490     {
 491         ERR("Out of memory!\n");
 492         goto out;
 493     }
 494
 495     /* Set up the context defaults */
 496     oldCtx  = pwglGetCurrentContext();
 497     oldDrawable = pwglGetCurrentDC();
 498     if(oldCtx && oldDrawable) {
 499         /* See comment in ActivateContext context switching */
 500         This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
 501     }
 502     if(pwglMakeCurrent(hdc, ctx) == FALSE) {
 503         ERR("Cannot activate context to set up defaults\n");
 504         goto out;
 505     }
 506
 507     ENTER_GL();
 508
 509     glGetIntegerv(GL_AUX_BUFFERS, &ret->aux_buffers);
 510
 511     TRACE("Setting up the screen\n");
 512     /* Clear the screen */
 513     glClearColor(1.0, 0.0, 0.0, 0.0);
 514     checkGLcall("glClearColor");
 515     glClearIndex(0);
 516     glClearDepth(1);
 517     glClearStencil(0xffff);
 518
 519     checkGLcall("glClear");
 520
 521     glColor3f(1.0, 1.0, 1.0);
 522     checkGLcall("glColor3f");
 523
 524     glEnable(GL_LIGHTING);
 525     checkGLcall("glEnable");
 526
 527     glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
 528     checkGLcall("glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);");
 529
 530     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
 531     checkGLcall("glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);");
 532
 533     glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
 534     checkGLcall("glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);");
 535
 536     glPixelStorei(GL_PACK_ALIGNMENT, This->surface_alignment);
 537     checkGLcall("glPixelStorei(GL_PACK_ALIGNMENT, This->surface_alignment);");
 538     glPixelStorei(GL_UNPACK_ALIGNMENT, This->surface_alignment);
 539     checkGLcall("glPixelStorei(GL_UNPACK_ALIGNMENT, This->surface_alignment);");
 540
 541     if(GL_SUPPORT(APPLE_CLIENT_STORAGE)) {
 542         /* Most textures will use client storage if supported. Exceptions are non-native power of 2 textures
 543          * and textures in DIB sections(due to the memory protection).
 544          */
 545         glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
 546         checkGLcall("glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE)");
 547     }
 548     if(GL_SUPPORT(ARB_VERTEX_BLEND)) {
 549         /* Direct3D always uses n-1 weights for n world matrices and uses 1 - sum for the last one
 550          * this is equal to GL_WEIGHT_SUM_UNITY_ARB. Enabling it doesn't do anything unless
 551          * GL_VERTEX_BLEND_ARB isn't enabled too
 552          */
 553         glEnable(GL_WEIGHT_SUM_UNITY_ARB);
 554         checkGLcall("glEnable(GL_WEIGHT_SUM_UNITY_ARB)");
 555     }
 556     if(GL_SUPPORT(NV_TEXTURE_SHADER2)) {
 557         /* Set up the previous texture input for all shader units. This applies to bump mapping, and in d3d
 558          * the previous texture where to source the offset from is always unit - 1.
 559          */
 560         for(s = 1; s < GL_LIMITS(textures); s++) {
 561             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
 562             glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + s - 1);
 563             checkGLcall("glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, ...\n");
 564         }
 565     }
 566
 567     if(GL_SUPPORT(ARB_POINT_SPRITE)) {
 568         for(s = 0; s < GL_LIMITS(textures); s++) {
 569             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
 570             glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
 571             checkGLcall("glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE)\n");
 572         }
 573     }
 574     LEAVE_GL();
 575
 576     /* Never keep GL_FRAGMENT_SHADER_ATI enabled on a context that we switch away from,
 577      * but enable it for the first context we create, and reenable it on the old context
 578      */
 579     if(oldDrawable && oldCtx) {
 580         pwglMakeCurrent(oldDrawable, oldCtx);
 581     } else {
 582         last_device = This;
 583     }
 584     This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
 585
 586     return ret;
 587
 588 out:
 589     HeapFree(GetProcessHeap(), 0, ret->fbo_color_attachments);
 590     return NULL;
 591 }
 592
 593 /*****************************************************************************
 594  * RemoveContextFromArray
 595  *
 596  * Removes a context from the context manager. The opengl context is not
 597  * destroyed or unset. context is not a valid pointer after that call.
 598  *
 599  * Similar to the former call this isn't a performance critical function. A
 600  * helper function for DestroyContext.
 601  *
 602  * Params:
 603  *  This: Device to activate the context for
 604  *  context: Context to remove
 605  *
 606  *****************************************************************************/
 607 static void RemoveContextFromArray(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 608     UINT t, s;
 609     WineD3DContext **oldArray = This->contexts;
 610
 611     TRACE("Removing ctx %p\n", context);
 612
 613     This->numContexts--;
 614
 615     if(This->numContexts) {
 616         This->contexts = HeapAlloc(GetProcessHeap(), 0, sizeof(*This->contexts) * This->numContexts);
 617         if(!This->contexts) {
 618             ERR("Cannot allocate a new context array, PANIC!!!\n");
 619         }
 620         t = 0;
 621         /* Note that we decreased numContexts a few lines up, so use '<=' instead of '<' */
 622         for(s = 0; s <= This->numContexts; s++) {
 623             if(oldArray[s] == context) continue;
 624             This->contexts[t] = oldArray[s];
 625             t++;
 626         }
 627     } else {
 628         This->contexts = NULL;
 629     }
 630
 631     HeapFree(GetProcessHeap(), 0, context);
 632     HeapFree(GetProcessHeap(), 0, oldArray);
 633 }
 634
 635 /*****************************************************************************
 636  * DestroyContext
 637  *
 638  * Destroys a wineD3DContext
 639  *
 640  * Params:
 641  *  This: Device to activate the context for
 642  *  context: Context to destroy
 643  *
 644  *****************************************************************************/
 645 void DestroyContext(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 646
 647     /* check that we are the current context first */
 648     TRACE("Destroying ctx %p\n", context);
 649     if(pwglGetCurrentContext() == context->glCtx){
 650         pwglMakeCurrent(NULL, NULL);
 651     } else {
 652         last_device = NULL;
 653     }
 654
 655     /* FIXME: We probably need an active context to do this... */
 656     if (context->fbo) {
 657         GL_EXTCALL(glDeleteFramebuffersEXT(1, &context->fbo));
 658     }
 659     if (context->src_fbo) {
 660         GL_EXTCALL(glDeleteFramebuffersEXT(1, &context->src_fbo));
 661     }
 662     if (context->dst_fbo) {
 663         GL_EXTCALL(glDeleteFramebuffersEXT(1, &context->dst_fbo));
 664     }
 665
 666     HeapFree(GetProcessHeap(), 0, context->fbo_color_attachments);
 667     context->fbo_color_attachments = NULL;
 668
 669     if(context->isPBuffer) {
 670         GL_EXTCALL(wglReleasePbufferDCARB(context->pbuffer, context->hdc));
 671         GL_EXTCALL(wglDestroyPbufferARB(context->pbuffer));
 672     } else ReleaseDC(context->win_handle, context->hdc);
 673     pwglDeleteContext(context->glCtx);
 674
 675     HeapFree(GetProcessHeap(), 0, context->vshader_const_dirty);
 676     HeapFree(GetProcessHeap(), 0, context->pshader_const_dirty);
 677     RemoveContextFromArray(This, context);
 678 }
 679
 680 static inline void set_blit_dimension(UINT width, UINT height) {
 681     glMatrixMode(GL_PROJECTION);
 682     checkGLcall("glMatrixMode(GL_PROJECTION)");
 683     glLoadIdentity();
 684     checkGLcall("glLoadIdentity()");
 685     glOrtho(0, width, height, 0, 0.0, -1.0);
 686     checkGLcall("glOrtho");
 687     glViewport(0, 0, width, height);
 688     checkGLcall("glViewport");
 689 }
 690
 691 /*****************************************************************************
 692  * SetupForBlit
 693  *
 694  * Sets up a context for DirectDraw blitting.
 695  * All texture units are disabled, texture unit 0 is set as current unit
 696  * fog, lighting, blending, alpha test, z test, scissor test, culling disabled
 697  * color writing enabled for all channels
 698  * register combiners disabled, shaders disabled
 699  * world matrix is set to identity, texture matrix 0 too
 700  * projection matrix is setup for drawing screen coordinates
 701  *
 702  * Params:
 703  *  This: Device to activate the context for
 704  *  context: Context to setup
 705  *  width: render target width
 706  *  height: render target height
 707  *
 708  *****************************************************************************/
 709 static inline void SetupForBlit(IWineD3DDeviceImpl *This, WineD3DContext *context, UINT width, UINT height) {
 710     int i, sampler;
 711     const struct StateEntry *StateTable = This->StateTable;
 712
 713     TRACE("Setting up context %p for blitting\n", context);
 714     if(context->last_was_blit) {
 715         if(context->blit_w != width || context->blit_h != height) {
 716             set_blit_dimension(width, height);
 717             context->blit_w = width; context->blit_h = height;
 718             /* No need to dirtify here, the states are still dirtified because they weren't
 719              * applied since the last SetupForBlit call. Otherwise last_was_blit would not
 720              * be set
 721              */
 722         }
 723         TRACE("Context is already set up for blitting, nothing to do\n");
 724         return;
 725     }
 726     context->last_was_blit = TRUE;
 727
 728     /* TODO: Use a display list */
 729
 730     /* Disable shaders */
 731     This->shader_backend->shader_cleanup((IWineD3DDevice *) This);
 732     Context_MarkStateDirty(context, STATE_VSHADER, StateTable);
 733     Context_MarkStateDirty(context, STATE_PIXELSHADER, StateTable);
 734
 735     /* Disable all textures. The caller can then bind a texture it wants to blit
 736      * from
 737      */
 738     if(GL_SUPPORT(NV_REGISTER_COMBINERS)) {
 739         glDisable(GL_REGISTER_COMBINERS_NV);
 740         checkGLcall("glDisable(GL_REGISTER_COMBINERS_NV)");
 741     }
 742     if (GL_SUPPORT(ARB_MULTITEXTURE)) {
 743         /* The blitting code uses (for now) the fixed function pipeline, so make sure to reset all fixed
 744          * function texture unit. No need to care for higher samplers
 745          */
 746         for(i = GL_LIMITS(textures) - 1; i > 0 ; i--) {
 747             sampler = This->rev_tex_unit_map[i];
 748             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + i));
 749             checkGLcall("glActiveTextureARB");
 750
 751             if(GL_SUPPORT(ARB_TEXTURE_CUBE_MAP)) {
 752                 glDisable(GL_TEXTURE_CUBE_MAP_ARB);
 753                 checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
 754             }
 755             glDisable(GL_TEXTURE_3D);
 756             checkGLcall("glDisable GL_TEXTURE_3D");
 757             if(GL_SUPPORT(ARB_TEXTURE_RECTANGLE)) {
 758                 glDisable(GL_TEXTURE_RECTANGLE_ARB);
 759                 checkGLcall("glDisable GL_TEXTURE_RECTANGLE_ARB");
 760             }
 761             glDisable(GL_TEXTURE_2D);
 762             checkGLcall("glDisable GL_TEXTURE_2D");
 763
 764             glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 765             checkGLcall("glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);");
 766
 767             if (sampler != -1) {
 768                 if (sampler < MAX_TEXTURES) {
 769                     Context_MarkStateDirty(context, STATE_TEXTURESTAGE(sampler, WINED3DTSS_COLOROP), StateTable);
 770                 }
 771                 Context_MarkStateDirty(context, STATE_SAMPLER(sampler), StateTable);
 772             }
 773         }
 774         GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB));
 775         checkGLcall("glActiveTextureARB");
 776     }
 777
 778     sampler = This->rev_tex_unit_map[0];
 779
 780     if(GL_SUPPORT(ARB_TEXTURE_CUBE_MAP)) {
 781         glDisable(GL_TEXTURE_CUBE_MAP_ARB);
 782         checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
 783     }
 784     glDisable(GL_TEXTURE_3D);
 785     checkGLcall("glDisable GL_TEXTURE_3D");
 786     if(GL_SUPPORT(ARB_TEXTURE_RECTANGLE)) {
 787         glDisable(GL_TEXTURE_RECTANGLE_ARB);
 788         checkGLcall("glDisable GL_TEXTURE_RECTANGLE_ARB");
 789     }
 790     glDisable(GL_TEXTURE_2D);
 791     checkGLcall("glDisable GL_TEXTURE_2D");
 792
 793     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 794
 795     glMatrixMode(GL_TEXTURE);
 796     checkGLcall("glMatrixMode(GL_TEXTURE)");
 797     glLoadIdentity();
 798     checkGLcall("glLoadIdentity()");
 799
 800     if (GL_SUPPORT(EXT_TEXTURE_LOD_BIAS)) {
 801         glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT,
 802                   GL_TEXTURE_LOD_BIAS_EXT,
 803                   0.0);
 804         checkGLcall("glTexEnvi GL_TEXTURE_LOD_BIAS_EXT ...");
 805     }
 806
 807     if (sampler != -1) {
 808         if (sampler < MAX_TEXTURES) {
 809             Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_TEXTURE0 + sampler), StateTable);
 810             Context_MarkStateDirty(context, STATE_TEXTURESTAGE(sampler, WINED3DTSS_COLOROP), StateTable);
 811         }
 812         Context_MarkStateDirty(context, STATE_SAMPLER(sampler), StateTable);
 813     }
 814
 815     /* Other misc states */
 816     glDisable(GL_ALPHA_TEST);
 817     checkGLcall("glDisable(GL_ALPHA_TEST)");
 818     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHATESTENABLE), StateTable);
 819     glDisable(GL_LIGHTING);
 820     checkGLcall("glDisable GL_LIGHTING");
 821     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_LIGHTING), StateTable);
 822     glDisable(GL_DEPTH_TEST);
 823     checkGLcall("glDisable GL_DEPTH_TEST");
 824     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ZENABLE), StateTable);
 825     glDisable(GL_FOG);
 826     checkGLcall("glDisable GL_FOG");
 827     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_FOGENABLE), StateTable);
 828     glDisable(GL_BLEND);
 829     checkGLcall("glDisable GL_BLEND");
 830     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
 831     glDisable(GL_CULL_FACE);
 832     checkGLcall("glDisable GL_CULL_FACE");
 833     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CULLMODE), StateTable);
 834     glDisable(GL_STENCIL_TEST);
 835     checkGLcall("glDisable GL_STENCIL_TEST");
 836     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_STENCILENABLE), StateTable);
 837     glDisable(GL_SCISSOR_TEST);
 838     checkGLcall("glDisable GL_SCISSOR_TEST");
 839     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
 840     if(GL_SUPPORT(ARB_POINT_SPRITE)) {
 841         glDisable(GL_POINT_SPRITE_ARB);
 842         checkGLcall("glDisable GL_POINT_SPRITE_ARB");
 843         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_POINTSPRITEENABLE), StateTable);
 844     }
 845     glColorMask(GL_TRUE, GL_TRUE,GL_TRUE,GL_TRUE);
 846     checkGLcall("glColorMask");
 847     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
 848     if (GL_SUPPORT(EXT_SECONDARY_COLOR)) {
 849         glDisable(GL_COLOR_SUM_EXT);
 850         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
 851         checkGLcall("glDisable(GL_COLOR_SUM_EXT)");
 852     }
 853     if (GL_SUPPORT(NV_REGISTER_COMBINERS)) {
 854         GL_EXTCALL(glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB));
 855         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
 856         checkGLcall("glFinalCombinerInputNV");
 857     }
 858
 859     /* Setup transforms */
 860     glMatrixMode(GL_MODELVIEW);
 861     checkGLcall("glMatrixMode(GL_MODELVIEW)");
 862     glLoadIdentity();
 863     checkGLcall("glLoadIdentity()");
 864     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_WORLDMATRIX(0)), StateTable);
 865
 866     context->last_was_rhw = TRUE;
 867     Context_MarkStateDirty(context, STATE_VDECL, StateTable); /* because of last_was_rhw = TRUE */
 868
 869     glDisable(GL_CLIP_PLANE0); checkGLcall("glDisable(clip plane 0)");
 870     glDisable(GL_CLIP_PLANE1); checkGLcall("glDisable(clip plane 1)");
 871     glDisable(GL_CLIP_PLANE2); checkGLcall("glDisable(clip plane 2)");
 872     glDisable(GL_CLIP_PLANE3); checkGLcall("glDisable(clip plane 3)");
 873     glDisable(GL_CLIP_PLANE4); checkGLcall("glDisable(clip plane 4)");
 874     glDisable(GL_CLIP_PLANE5); checkGLcall("glDisable(clip plane 5)");
 875     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
 876
 877     set_blit_dimension(width, height);
 878     context->blit_w = width; context->blit_h = height;
 879     Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 880     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_PROJECTION), StateTable);
 881
 882
 883     This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
 884 }
 885
 886 /*****************************************************************************
 887  * findThreadContextForSwapChain
 888  *
 889  * Searches a swapchain for all contexts and picks one for the thread tid.
 890  * If none can be found the swapchain is requested to create a new context
 891  *
 892  *****************************************************************************/
 893 static WineD3DContext *findThreadContextForSwapChain(IWineD3DSwapChain *swapchain, DWORD tid) {
 894     int i;
 895
 896     for(i = 0; i < ((IWineD3DSwapChainImpl *) swapchain)->num_contexts; i++) {
 897         if(((IWineD3DSwapChainImpl *) swapchain)->context[i]->tid == tid) {
 898             return ((IWineD3DSwapChainImpl *) swapchain)->context[i];
 899         }
 900
 901     }
 902
 903     /* Create a new context for the thread */
 904     return IWineD3DSwapChainImpl_CreateContextForThread(swapchain);
 905 }
 906
 907 /*****************************************************************************
 908  * FindContext
 909  *
 910  * Finds a context for the current render target and thread
 911  *
 912  * Parameters:
 913  *  target: Render target to find the context for
 914  *  tid: Thread to activate the context for
 915  *
 916  * Returns: The needed context
 917  *
 918  *****************************************************************************/
 919 static inline WineD3DContext *FindContext(IWineD3DDeviceImpl *This, IWineD3DSurface *target, DWORD tid) {
 920     IWineD3DSwapChain *swapchain = NULL;
 921     HRESULT hr;
 922     BOOL readTexture = wined3d_settings.offscreen_rendering_mode != ORM_FBO && This->render_offscreen;
 923     WineD3DContext *context = This->activeContext;
 924     BOOL oldRenderOffscreen = This->render_offscreen;
 925     const WINED3DFORMAT oldFmt = ((IWineD3DSurfaceImpl *) This->lastActiveRenderTarget)->resource.format;
 926     const WINED3DFORMAT newFmt = ((IWineD3DSurfaceImpl *) target)->resource.format;
 927     const struct StateEntry *StateTable = This->StateTable;
 928
 929     /* To compensate the lack of format switching with some offscreen rendering methods and on onscreen buffers
 930      * the alpha blend state changes with different render target formats
 931      */
 932     if(oldFmt != newFmt) {
 933         const GlPixelFormatDesc *glDesc;
 934         const StaticPixelFormatDesc *old = getFormatDescEntry(oldFmt, NULL, NULL);
 935         const StaticPixelFormatDesc *new = getFormatDescEntry(newFmt, &GLINFO_LOCATION, &glDesc);
 936
 937         /* Disable blending when the alphaMask has changed and when a format doesn't support blending */
 938         if((old->alphaMask && !new->alphaMask) || (!old->alphaMask && new->alphaMask) || !(glDesc->Flags & WINED3DFMT_FLAG_POSTPIXELSHADER_BLENDING)) {
 939             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
 940         }
 941     }
 942
 943     hr = IWineD3DSurface_GetContainer(target, &IID_IWineD3DSwapChain, (void **) &swapchain);
 944     if(hr == WINED3D_OK && swapchain) {
 945         TRACE("Rendering onscreen\n");
 946
 947         context = findThreadContextForSwapChain(swapchain, tid);
 948
 949         This->render_offscreen = FALSE;
 950         /* The context != This->activeContext will catch a NOP context change. This can occur
 951          * if we are switching back to swapchain rendering in case of FBO or Back Buffer offscreen
 952          * rendering. No context change is needed in that case
 953          */
 954
 955         if(wined3d_settings.offscreen_rendering_mode == ORM_PBUFFER) {
 956             if(This->pbufferContext && tid == This->pbufferContext->tid) {
 957                 This->pbufferContext->tid = 0;
 958             }
 959         }
 960         IWineD3DSwapChain_Release(swapchain);
 961
 962         if(oldRenderOffscreen) {
 963             Context_MarkStateDirty(context, WINED3DTS_PROJECTION, StateTable);
 964             Context_MarkStateDirty(context, STATE_VDECL, StateTable);
 965             Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 966             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
 967             Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
 968         }
 969
 970     } else {
 971         TRACE("Rendering offscreen\n");
 972         This->render_offscreen = TRUE;
 973
 974         switch(wined3d_settings.offscreen_rendering_mode) {
 975             case ORM_FBO:
 976                 /* FBOs do not need a different context. Stay with whatever context is active at the moment */
 977                 if(This->activeContext && tid == This->lastThread) {
 978                     context = This->activeContext;
 979                 } else {
 980                     /* This may happen if the app jumps straight into offscreen rendering
 981                      * Start using the context of the primary swapchain. tid == 0 is no problem
 982                      * for findThreadContextForSwapChain.
 983                      *
 984                      * Can also happen on thread switches - in that case findThreadContextForSwapChain
 985                      * is perfect to call.
 986                      */
 987                     context = findThreadContextForSwapChain(This->swapchains[0], tid);
 988                 }
 989                 break;
 990
 991             case ORM_PBUFFER:
 992             {
 993                 IWineD3DSurfaceImpl *targetimpl = (IWineD3DSurfaceImpl *) target;
 994                 if(This->pbufferContext == NULL ||
 995                    This->pbufferWidth < targetimpl->currentDesc.Width ||
 996                    This->pbufferHeight < targetimpl->currentDesc.Height) {
 997                     if(This->pbufferContext) {
 998                         DestroyContext(This, This->pbufferContext);
 999                     }
1000
1001                     /* The display is irrelevant here, the window is 0. But CreateContext needs a valid X connection.
1002                      * Create the context on the same server as the primary swapchain. The primary swapchain is exists at this point.
1003                      */
1004                     This->pbufferContext = CreateContext(This, targetimpl,
1005                             ((IWineD3DSwapChainImpl *) This->swapchains[0])->context[0]->win_handle,
1006                             TRUE /* pbuffer */, &((IWineD3DSwapChainImpl *)This->swapchains[0])->presentParms);
1007                     This->pbufferWidth = targetimpl->currentDesc.Width;
1008                     This->pbufferHeight = targetimpl->currentDesc.Height;
1009                    }
1010
1011                    if(This->pbufferContext) {
1012                        if(This->pbufferContext->tid != 0 && This->pbufferContext->tid != tid) {
1013                            FIXME("The PBuffr context is only supported for one thread for now!\n");
1014                        }
1015                        This->pbufferContext->tid = tid;
1016                        context = This->pbufferContext;
1017                        break;
1018                    } else {
1019                        ERR("Failed to create a buffer context and drawable, falling back to back buffer offscreen rendering\n");
1020                        wined3d_settings.offscreen_rendering_mode = ORM_BACKBUFFER;
1021                    }
1022             }
1023
1024             case ORM_BACKBUFFER:
1025                 /* Stay with the currently active context for back buffer rendering */
1026                 if(This->activeContext && tid == This->lastThread) {
1027                     context = This->activeContext;
1028                 } else {
1029                     /* This may happen if the app jumps straight into offscreen rendering
1030                      * Start using the context of the primary swapchain. tid == 0 is no problem
1031                      * for findThreadContextForSwapChain.
1032                      *
1033                      * Can also happen on thread switches - in that case findThreadContextForSwapChain
1034                      * is perfect to call.
1035                      */
1036                     context = findThreadContextForSwapChain(This->swapchains[0], tid);
1037                 }
1038                 break;
1039         }
1040
1041         if(!oldRenderOffscreen) {
1042             Context_MarkStateDirty(context, WINED3DTS_PROJECTION, StateTable);
1043             Context_MarkStateDirty(context, STATE_VDECL, StateTable);
1044             Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
1045             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
1046             Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
1047         }
1048     }
1049
1050     /* When switching away from an offscreen render target, and we're not using FBOs,
1051      * we have to read the drawable into the texture. This is done via PreLoad(and
1052      * SFLAG_INDRAWABLE set on the surface). There are some things that need care though.
1053      * PreLoad needs a GL context, and FindContext is called before the context is activated.
1054      * It also has to be called with the old rendertarget active, otherwise a wrong drawable
1055      * is read. This leads to these possible situations:
1056      *
1057      * 0) lastActiveRenderTarget == target && oldTid == newTid:
1058      *    Nothing to do, we don't even reach this code in this case...
1059      *
1060      * 1) lastActiveRenderTarget != target && oldTid == newTid:
1061      *    The currently active context is OK for readback. Call PreLoad, and it
1062      *    performs the read
1063      *
1064      * 2) lastActiveRenderTarget == target && oldTid != newTid:
1065      *    Nothing to do - the drawable is unchanged
1066      *
1067      * 3) lastActiveRenderTarget != target && oldTid != newTid:
1068      *    This is tricky. We have to get a context with the old drawable from somewhere
1069      *    before we can switch to the new context. In this case, PreLoad calls
1070      *    ActivateContext(lastActiveRenderTarget) from the new(current) thread. This
1071      *    is case (2) then. The old drawable is activated for the new thread, and the
1072      *    readback can be done. The recursed ActivateContext does *not* call PreLoad again.
1073      *    After that, the outer ActivateContext(which calls PreLoad) can activate the new
1074      *    target for the new thread
1075      */
1076     if (readTexture && This->lastActiveRenderTarget != target) {
1077         BOOL oldInDraw = This->isInDraw;
1078
1079         /* PreLoad requires a context to load the texture, thus it will call ActivateContext.
1080          * Set the isInDraw to true to signal PreLoad that it has a context. Will be tricky
1081          * when using offscreen rendering with multithreading
1082          */
1083         This->isInDraw = TRUE;
1084
1085         /* Do that before switching the context:
1086          * Read the back buffer of the old drawable into the destination texture
1087          */
1088         IWineD3DSurface_PreLoad(This->lastActiveRenderTarget);
1089
1090         /* Assume that the drawable will be modified by some other things now */
1091         IWineD3DSurface_ModifyLocation(This->lastActiveRenderTarget, SFLAG_INDRAWABLE, FALSE);
1092
1093         This->isInDraw = oldInDraw;
1094     }
1095
1096     return context;
1097 }
1098
1099 static void apply_draw_buffer(IWineD3DDeviceImpl *This, IWineD3DSurface *target, BOOL blit)
1100 {
1101     HRESULT hr;
1102     IWineD3DSwapChain *swapchain;
1103
1104     hr = IWineD3DSurface_GetContainer(target, &IID_IWineD3DSwapChain, (void **)&swapchain);
1105     if (SUCCEEDED(hr))
1106     {
1107         IWineD3DSwapChain_Release((IUnknown *)swapchain);
1108         glDrawBuffer(surface_get_gl_buffer(target, swapchain));
1109         checkGLcall("glDrawBuffers()");
1110     }
1111     else
1112     {
1113         if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
1114         {
1115             if (!blit)
1116             {
1117                 if (GL_SUPPORT(ARB_DRAW_BUFFERS))
1118                 {
1119                     GL_EXTCALL(glDrawBuffersARB(GL_LIMITS(buffers), This->draw_buffers));
1120                     checkGLcall("glDrawBuffers()");
1121                 }
1122                 else
1123                 {
1124                     glDrawBuffer(This->draw_buffers[0]);
1125                     checkGLcall("glDrawBuffer()");
1126                 }
1127             } else {
1128                 glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
1129                 checkGLcall("glDrawBuffer()");
1130             }
1131         }
1132         else
1133         {
1134             glDrawBuffer(This->offscreenBuffer);
1135             checkGLcall("glDrawBuffer()");
1136         }
1137     }
1138 }
1139
1140 /*****************************************************************************
1141  * ActivateContext
1142  *
1143  * Finds a rendering context and drawable matching the device and render
1144  * target for the current thread, activates them and puts them into the
1145  * requested state.
1146  *
1147  * Params:
1148  *  This: Device to activate the context for
1149  *  target: Requested render target
1150  *  usage: Prepares the context for blitting, drawing or other actions
1151  *
1152  *****************************************************************************/
1153 void ActivateContext(IWineD3DDeviceImpl *This, IWineD3DSurface *target, ContextUsage usage) {
1154     DWORD                         tid = GetCurrentThreadId();
1155     int                           i;
1156     DWORD                         dirtyState, idx;
1157     BYTE                          shift;
1158     WineD3DContext                *context;
1159     const struct StateEntry       *StateTable = This->StateTable;
1160
1161     TRACE("(%p): Selecting context for render target %p, thread %d\n", This, target, tid);
1162     if(This->lastActiveRenderTarget != target || tid != This->lastThread) {
1163         context = FindContext(This, target, tid);
1164         context->draw_buffer_dirty = TRUE;
1165         This->lastActiveRenderTarget = target;
1166         This->lastThread = tid;
1167     } else {
1168         /* Stick to the old context */
1169         context = This->activeContext;
1170     }
1171
1172     /* Activate the opengl context */
1173     if(last_device != This || context != This->activeContext) {
1174         BOOL ret;
1175
1176         /* Prevent an unneeded context switch as those are expensive */
1177         if(context->glCtx && (context->glCtx == pwglGetCurrentContext())) {
1178             TRACE("Already using gl context %p\n", context->glCtx);
1179         }
1180         else {
1181             TRACE("Switching gl ctx to %p, hdc=%p ctx=%p\n", context, context->hdc, context->glCtx);
1182
1183             This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
1184             ret = pwglMakeCurrent(context->hdc, context->glCtx);
1185             if(ret == FALSE) {
1186                 ERR("Failed to activate the new context\n");
1187             } else if(!context->last_was_blit) {
1188                 This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
1189             }
1190         }
1191         if(This->activeContext->vshader_const_dirty) {
1192             memset(This->activeContext->vshader_const_dirty, 1,
1193                    sizeof(*This->activeContext->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
1194         }
1195         if(This->activeContext->pshader_const_dirty) {
1196             memset(This->activeContext->pshader_const_dirty, 1,
1197                    sizeof(*This->activeContext->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
1198         }
1199         This->activeContext = context;
1200         last_device = This;
1201     }
1202
1203     /* We only need ENTER_GL for the gl calls made below and for the helper functions which make GL calls */
1204     ENTER_GL();
1205
1206     switch (usage) {
1207         case CTXUSAGE_CLEAR:
1208         case CTXUSAGE_DRAWPRIM:
1209             if (wined3d_settings.offscreen_rendering_mode == ORM_FBO) {
1210                 apply_fbo_state((IWineD3DDevice *)This);
1211             }
1212             if (context->draw_buffer_dirty) {
1213                 apply_draw_buffer(This, target, FALSE);
1214                 context->draw_buffer_dirty = FALSE;
1215             }
1216             break;
1217
1218         case CTXUSAGE_BLIT:
1219             if (wined3d_settings.offscreen_rendering_mode == ORM_FBO) {
1220                 if (This->render_offscreen) {
1221                     FIXME("Activating for CTXUSAGE_BLIT for an offscreen target with ORM_FBO. This should be avoided.\n");
1222                     bind_fbo((IWineD3DDevice *)This, GL_FRAMEBUFFER_EXT, &context->dst_fbo);
1223                     attach_surface_fbo(This, GL_FRAMEBUFFER_EXT, 0, target);
1224                     GL_EXTCALL(glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0));
1225                     checkGLcall("glFramebufferRenderbufferEXT");
1226                 } else {
1227                     GL_EXTCALL(glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0));
1228                     checkGLcall("glFramebufferRenderbufferEXT");
1229                 }
1230                 context->draw_buffer_dirty = TRUE;
1231             }
1232             if (context->draw_buffer_dirty) {
1233                 apply_draw_buffer(This, target, TRUE);
1234                 if (wined3d_settings.offscreen_rendering_mode != ORM_FBO) {
1235                     context->draw_buffer_dirty = FALSE;
1236                 }
1237             }
1238             break;
1239
1240         default:
1241             break;
1242     }
1243
1244     switch(usage) {
1245         case CTXUSAGE_RESOURCELOAD:
1246             /* This does not require any special states to be set up */
1247             break;
1248
1249         case CTXUSAGE_CLEAR:
1250             if(context->last_was_blit) {
1251                 This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
1252             }
1253
1254             /* Blending and clearing should be orthogonal, but tests on the nvidia driver show that disabling
1255              * blending when clearing improves the clearing performance incredibly.
1256              */
1257             glDisable(GL_BLEND);
1258             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
1259
1260             glEnable(GL_SCISSOR_TEST);
1261             checkGLcall("glEnable GL_SCISSOR_TEST");
1262             context->last_was_blit = FALSE;
1263             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
1264             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
1265             break;
1266
1267         case CTXUSAGE_DRAWPRIM:
1268             /* This needs all dirty states applied */
1269             if(context->last_was_blit) {
1270                 This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
1271             }
1272
1273             IWineD3DDeviceImpl_FindTexUnitMap(This);
1274
1275             for(i=0; i < context->numDirtyEntries; i++) {
1276                 dirtyState = context->dirtyArray[i];
1277                 idx = dirtyState >> 5;
1278                 shift = dirtyState & 0x1f;
1279                 context->isStateDirty[idx] &= ~(1 << shift);
1280                 StateTable[dirtyState].apply(dirtyState, This->stateBlock, context);
1281             }
1282             context->numDirtyEntries = 0; /* This makes the whole list clean */
1283             context->last_was_blit = FALSE;
1284             break;
1285
1286         case CTXUSAGE_BLIT:
1287             SetupForBlit(This, context,
1288                          ((IWineD3DSurfaceImpl *)target)->currentDesc.Width,
1289                          ((IWineD3DSurfaceImpl *)target)->currentDesc.Height);
1290             break;
1291
1292         default:
1293             FIXME("Unexpected context usage requested\n");
1294     }
1295     LEAVE_GL();
1296 }