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     /* Set up the context defaults */
 489     oldCtx  = pwglGetCurrentContext();
 490     oldDrawable = pwglGetCurrentDC();
 491     if(oldCtx && oldDrawable) {
 492         /* See comment in ActivateContext context switching */
 493         This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
 494     }
 495     if(pwglMakeCurrent(hdc, ctx) == FALSE) {
 496         ERR("Cannot activate context to set up defaults\n");
 497         goto out;
 498     }
 499
 500     ENTER_GL();
 501
 502     glGetIntegerv(GL_AUX_BUFFERS, &ret->aux_buffers);
 503
 504     TRACE("Setting up the screen\n");
 505     /* Clear the screen */
 506     glClearColor(1.0, 0.0, 0.0, 0.0);
 507     checkGLcall("glClearColor");
 508     glClearIndex(0);
 509     glClearDepth(1);
 510     glClearStencil(0xffff);
 511
 512     checkGLcall("glClear");
 513
 514     glColor3f(1.0, 1.0, 1.0);
 515     checkGLcall("glColor3f");
 516
 517     glEnable(GL_LIGHTING);
 518     checkGLcall("glEnable");
 519
 520     glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
 521     checkGLcall("glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);");
 522
 523     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
 524     checkGLcall("glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);");
 525
 526     glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
 527     checkGLcall("glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);");
 528
 529     glPixelStorei(GL_PACK_ALIGNMENT, This->surface_alignment);
 530     checkGLcall("glPixelStorei(GL_PACK_ALIGNMENT, This->surface_alignment);");
 531     glPixelStorei(GL_UNPACK_ALIGNMENT, This->surface_alignment);
 532     checkGLcall("glPixelStorei(GL_UNPACK_ALIGNMENT, This->surface_alignment);");
 533
 534     if(GL_SUPPORT(APPLE_CLIENT_STORAGE)) {
 535         /* Most textures will use client storage if supported. Exceptions are non-native power of 2 textures
 536          * and textures in DIB sections(due to the memory protection).
 537          */
 538         glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
 539         checkGLcall("glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE)");
 540     }
 541     if(GL_SUPPORT(ARB_VERTEX_BLEND)) {
 542         /* Direct3D always uses n-1 weights for n world matrices and uses 1 - sum for the last one
 543          * this is equal to GL_WEIGHT_SUM_UNITY_ARB. Enabling it doesn't do anything unless
 544          * GL_VERTEX_BLEND_ARB isn't enabled too
 545          */
 546         glEnable(GL_WEIGHT_SUM_UNITY_ARB);
 547         checkGLcall("glEnable(GL_WEIGHT_SUM_UNITY_ARB)");
 548     }
 549     if(GL_SUPPORT(NV_TEXTURE_SHADER2)) {
 550         /* Set up the previous texture input for all shader units. This applies to bump mapping, and in d3d
 551          * the previous texture where to source the offset from is always unit - 1.
 552          */
 553         for(s = 1; s < GL_LIMITS(textures); s++) {
 554             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
 555             glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + s - 1);
 556             checkGLcall("glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, ...\n");
 557         }
 558     }
 559
 560     if(GL_SUPPORT(ARB_POINT_SPRITE)) {
 561         for(s = 0; s < GL_LIMITS(textures); s++) {
 562             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + s));
 563             glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
 564             checkGLcall("glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE)\n");
 565         }
 566     }
 567     LEAVE_GL();
 568
 569     /* Never keep GL_FRAGMENT_SHADER_ATI enabled on a context that we switch away from,
 570      * but enable it for the first context we create, and reenable it on the old context
 571      */
 572     if(oldDrawable && oldCtx) {
 573         pwglMakeCurrent(oldDrawable, oldCtx);
 574     } else {
 575         last_device = This;
 576     }
 577     This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
 578
 579 out:
 580     return ret;
 581 }
 582
 583 /*****************************************************************************
 584  * RemoveContextFromArray
 585  *
 586  * Removes a context from the context manager. The opengl context is not
 587  * destroyed or unset. context is not a valid pointer after that call.
 588  *
 589  * Similar to the former call this isn't a performance critical function. A
 590  * helper function for DestroyContext.
 591  *
 592  * Params:
 593  *  This: Device to activate the context for
 594  *  context: Context to remove
 595  *
 596  *****************************************************************************/
 597 static void RemoveContextFromArray(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 598     UINT t, s;
 599     WineD3DContext **oldArray = This->contexts;
 600
 601     TRACE("Removing ctx %p\n", context);
 602
 603     This->numContexts--;
 604
 605     if(This->numContexts) {
 606         This->contexts = HeapAlloc(GetProcessHeap(), 0, sizeof(*This->contexts) * This->numContexts);
 607         if(!This->contexts) {
 608             ERR("Cannot allocate a new context array, PANIC!!!\n");
 609         }
 610         t = 0;
 611         /* Note that we decreased numContexts a few lines up, so use '<=' instead of '<' */
 612         for(s = 0; s <= This->numContexts; s++) {
 613             if(oldArray[s] == context) continue;
 614             This->contexts[t] = oldArray[s];
 615             t++;
 616         }
 617     } else {
 618         This->contexts = NULL;
 619     }
 620
 621     HeapFree(GetProcessHeap(), 0, context);
 622     HeapFree(GetProcessHeap(), 0, oldArray);
 623 }
 624
 625 /*****************************************************************************
 626  * DestroyContext
 627  *
 628  * Destroys a wineD3DContext
 629  *
 630  * Params:
 631  *  This: Device to activate the context for
 632  *  context: Context to destroy
 633  *
 634  *****************************************************************************/
 635 void DestroyContext(IWineD3DDeviceImpl *This, WineD3DContext *context) {
 636
 637     /* check that we are the current context first */
 638     TRACE("Destroying ctx %p\n", context);
 639     if(pwglGetCurrentContext() == context->glCtx){
 640         pwglMakeCurrent(NULL, NULL);
 641     } else {
 642         last_device = NULL;
 643     }
 644
 645     if(context->isPBuffer) {
 646         GL_EXTCALL(wglReleasePbufferDCARB(context->pbuffer, context->hdc));
 647         GL_EXTCALL(wglDestroyPbufferARB(context->pbuffer));
 648     } else ReleaseDC(context->win_handle, context->hdc);
 649     pwglDeleteContext(context->glCtx);
 650
 651     HeapFree(GetProcessHeap(), 0, context->vshader_const_dirty);
 652     HeapFree(GetProcessHeap(), 0, context->pshader_const_dirty);
 653     RemoveContextFromArray(This, context);
 654 }
 655
 656 static inline void set_blit_dimension(UINT width, UINT height) {
 657     glMatrixMode(GL_PROJECTION);
 658     checkGLcall("glMatrixMode(GL_PROJECTION)");
 659     glLoadIdentity();
 660     checkGLcall("glLoadIdentity()");
 661     glOrtho(0, width, height, 0, 0.0, -1.0);
 662     checkGLcall("glOrtho");
 663     glViewport(0, 0, width, height);
 664     checkGLcall("glViewport");
 665 }
 666
 667 /*****************************************************************************
 668  * SetupForBlit
 669  *
 670  * Sets up a context for DirectDraw blitting.
 671  * All texture units are disabled, texture unit 0 is set as current unit
 672  * fog, lighting, blending, alpha test, z test, scissor test, culling disabled
 673  * color writing enabled for all channels
 674  * register combiners disabled, shaders disabled
 675  * world matrix is set to identity, texture matrix 0 too
 676  * projection matrix is setup for drawing screen coordinates
 677  *
 678  * Params:
 679  *  This: Device to activate the context for
 680  *  context: Context to setup
 681  *  width: render target width
 682  *  height: render target height
 683  *
 684  *****************************************************************************/
 685 static inline void SetupForBlit(IWineD3DDeviceImpl *This, WineD3DContext *context, UINT width, UINT height) {
 686     int i, sampler;
 687     const struct StateEntry *StateTable = This->StateTable;
 688
 689     TRACE("Setting up context %p for blitting\n", context);
 690     if(context->last_was_blit) {
 691         if(context->blit_w != width || context->blit_h != height) {
 692             set_blit_dimension(width, height);
 693             context->blit_w = width; context->blit_h = height;
 694             /* No need to dirtify here, the states are still dirtified because they weren't
 695              * applied since the last SetupForBlit call. Otherwise last_was_blit would not
 696              * be set
 697              */
 698         }
 699         TRACE("Context is already set up for blitting, nothing to do\n");
 700         return;
 701     }
 702     context->last_was_blit = TRUE;
 703
 704     /* TODO: Use a display list */
 705
 706     /* Disable shaders */
 707     This->shader_backend->shader_cleanup((IWineD3DDevice *) This);
 708     Context_MarkStateDirty(context, STATE_VSHADER, StateTable);
 709     Context_MarkStateDirty(context, STATE_PIXELSHADER, StateTable);
 710
 711     /* Disable all textures. The caller can then bind a texture it wants to blit
 712      * from
 713      */
 714     if(GL_SUPPORT(NV_REGISTER_COMBINERS)) {
 715         glDisable(GL_REGISTER_COMBINERS_NV);
 716         checkGLcall("glDisable(GL_REGISTER_COMBINERS_NV)");
 717     }
 718     if (GL_SUPPORT(ARB_MULTITEXTURE)) {
 719         /* The blitting code uses (for now) the fixed function pipeline, so make sure to reset all fixed
 720          * function texture unit. No need to care for higher samplers
 721          */
 722         for(i = GL_LIMITS(textures) - 1; i > 0 ; i--) {
 723             sampler = This->rev_tex_unit_map[i];
 724             GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB + i));
 725             checkGLcall("glActiveTextureARB");
 726
 727             if(GL_SUPPORT(ARB_TEXTURE_CUBE_MAP)) {
 728                 glDisable(GL_TEXTURE_CUBE_MAP_ARB);
 729                 checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
 730             }
 731             glDisable(GL_TEXTURE_3D);
 732             checkGLcall("glDisable GL_TEXTURE_3D");
 733             if(GL_SUPPORT(ARB_TEXTURE_RECTANGLE)) {
 734                 glDisable(GL_TEXTURE_RECTANGLE_ARB);
 735                 checkGLcall("glDisable GL_TEXTURE_RECTANGLE_ARB");
 736             }
 737             glDisable(GL_TEXTURE_2D);
 738             checkGLcall("glDisable GL_TEXTURE_2D");
 739
 740             glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 741             checkGLcall("glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);");
 742
 743             if (sampler != -1) {
 744                 if (sampler < MAX_TEXTURES) {
 745                     Context_MarkStateDirty(context, STATE_TEXTURESTAGE(sampler, WINED3DTSS_COLOROP), StateTable);
 746                 }
 747                 Context_MarkStateDirty(context, STATE_SAMPLER(sampler), StateTable);
 748             }
 749         }
 750         GL_EXTCALL(glActiveTextureARB(GL_TEXTURE0_ARB));
 751         checkGLcall("glActiveTextureARB");
 752     }
 753
 754     sampler = This->rev_tex_unit_map[0];
 755
 756     if(GL_SUPPORT(ARB_TEXTURE_CUBE_MAP)) {
 757         glDisable(GL_TEXTURE_CUBE_MAP_ARB);
 758         checkGLcall("glDisable GL_TEXTURE_CUBE_MAP_ARB");
 759     }
 760     glDisable(GL_TEXTURE_3D);
 761     checkGLcall("glDisable GL_TEXTURE_3D");
 762     if(GL_SUPPORT(ARB_TEXTURE_RECTANGLE)) {
 763         glDisable(GL_TEXTURE_RECTANGLE_ARB);
 764         checkGLcall("glDisable GL_TEXTURE_RECTANGLE_ARB");
 765     }
 766     glDisable(GL_TEXTURE_2D);
 767     checkGLcall("glDisable GL_TEXTURE_2D");
 768
 769     glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 770
 771     glMatrixMode(GL_TEXTURE);
 772     checkGLcall("glMatrixMode(GL_TEXTURE)");
 773     glLoadIdentity();
 774     checkGLcall("glLoadIdentity()");
 775
 776     if (GL_SUPPORT(EXT_TEXTURE_LOD_BIAS)) {
 777         glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT,
 778                   GL_TEXTURE_LOD_BIAS_EXT,
 779                   0.0);
 780         checkGLcall("glTexEnvi GL_TEXTURE_LOD_BIAS_EXT ...");
 781     }
 782
 783     if (sampler != -1) {
 784         if (sampler < MAX_TEXTURES) {
 785             Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_TEXTURE0 + sampler), StateTable);
 786             Context_MarkStateDirty(context, STATE_TEXTURESTAGE(sampler, WINED3DTSS_COLOROP), StateTable);
 787         }
 788         Context_MarkStateDirty(context, STATE_SAMPLER(sampler), StateTable);
 789     }
 790
 791     /* Other misc states */
 792     glDisable(GL_ALPHA_TEST);
 793     checkGLcall("glDisable(GL_ALPHA_TEST)");
 794     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHATESTENABLE), StateTable);
 795     glDisable(GL_LIGHTING);
 796     checkGLcall("glDisable GL_LIGHTING");
 797     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_LIGHTING), StateTable);
 798     glDisable(GL_DEPTH_TEST);
 799     checkGLcall("glDisable GL_DEPTH_TEST");
 800     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ZENABLE), StateTable);
 801     glDisable(GL_FOG);
 802     checkGLcall("glDisable GL_FOG");
 803     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_FOGENABLE), StateTable);
 804     glDisable(GL_BLEND);
 805     checkGLcall("glDisable GL_BLEND");
 806     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
 807     glDisable(GL_CULL_FACE);
 808     checkGLcall("glDisable GL_CULL_FACE");
 809     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CULLMODE), StateTable);
 810     glDisable(GL_STENCIL_TEST);
 811     checkGLcall("glDisable GL_STENCIL_TEST");
 812     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_STENCILENABLE), StateTable);
 813     glDisable(GL_SCISSOR_TEST);
 814     checkGLcall("glDisable GL_SCISSOR_TEST");
 815     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
 816     if(GL_SUPPORT(ARB_POINT_SPRITE)) {
 817         glDisable(GL_POINT_SPRITE_ARB);
 818         checkGLcall("glDisable GL_POINT_SPRITE_ARB");
 819         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_POINTSPRITEENABLE), StateTable);
 820     }
 821     glColorMask(GL_TRUE, GL_TRUE,GL_TRUE,GL_TRUE);
 822     checkGLcall("glColorMask");
 823     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
 824     if (GL_SUPPORT(EXT_SECONDARY_COLOR)) {
 825         glDisable(GL_COLOR_SUM_EXT);
 826         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
 827         checkGLcall("glDisable(GL_COLOR_SUM_EXT)");
 828     }
 829     if (GL_SUPPORT(NV_REGISTER_COMBINERS)) {
 830         GL_EXTCALL(glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB));
 831         Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SPECULARENABLE), StateTable);
 832         checkGLcall("glFinalCombinerInputNV");
 833     }
 834
 835     /* Setup transforms */
 836     glMatrixMode(GL_MODELVIEW);
 837     checkGLcall("glMatrixMode(GL_MODELVIEW)");
 838     glLoadIdentity();
 839     checkGLcall("glLoadIdentity()");
 840     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_WORLDMATRIX(0)), StateTable);
 841
 842     context->last_was_rhw = TRUE;
 843     Context_MarkStateDirty(context, STATE_VDECL, StateTable); /* because of last_was_rhw = TRUE */
 844
 845     glDisable(GL_CLIP_PLANE0); checkGLcall("glDisable(clip plane 0)");
 846     glDisable(GL_CLIP_PLANE1); checkGLcall("glDisable(clip plane 1)");
 847     glDisable(GL_CLIP_PLANE2); checkGLcall("glDisable(clip plane 2)");
 848     glDisable(GL_CLIP_PLANE3); checkGLcall("glDisable(clip plane 3)");
 849     glDisable(GL_CLIP_PLANE4); checkGLcall("glDisable(clip plane 4)");
 850     glDisable(GL_CLIP_PLANE5); checkGLcall("glDisable(clip plane 5)");
 851     Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_CLIPPING), StateTable);
 852
 853     set_blit_dimension(width, height);
 854     context->blit_w = width; context->blit_h = height;
 855     Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 856     Context_MarkStateDirty(context, STATE_TRANSFORM(WINED3DTS_PROJECTION), StateTable);
 857
 858
 859     This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
 860 }
 861
 862 /*****************************************************************************
 863  * findThreadContextForSwapChain
 864  *
 865  * Searches a swapchain for all contexts and picks one for the thread tid.
 866  * If none can be found the swapchain is requested to create a new context
 867  *
 868  *****************************************************************************/
 869 static WineD3DContext *findThreadContextForSwapChain(IWineD3DSwapChain *swapchain, DWORD tid) {
 870     int i;
 871
 872     for(i = 0; i < ((IWineD3DSwapChainImpl *) swapchain)->num_contexts; i++) {
 873         if(((IWineD3DSwapChainImpl *) swapchain)->context[i]->tid == tid) {
 874             return ((IWineD3DSwapChainImpl *) swapchain)->context[i];
 875         }
 876
 877     }
 878
 879     /* Create a new context for the thread */
 880     return IWineD3DSwapChainImpl_CreateContextForThread(swapchain);
 881 }
 882
 883 /*****************************************************************************
 884  * FindContext
 885  *
 886  * Finds a context for the current render target and thread
 887  *
 888  * Parameters:
 889  *  target: Render target to find the context for
 890  *  tid: Thread to activate the context for
 891  *
 892  * Returns: The needed context
 893  *
 894  *****************************************************************************/
 895 static inline WineD3DContext *FindContext(IWineD3DDeviceImpl *This, IWineD3DSurface *target, DWORD tid) {
 896     IWineD3DSwapChain *swapchain = NULL;
 897     HRESULT hr;
 898     BOOL readTexture = wined3d_settings.offscreen_rendering_mode != ORM_FBO && This->render_offscreen;
 899     WineD3DContext *context = This->activeContext;
 900     BOOL oldRenderOffscreen = This->render_offscreen;
 901     const WINED3DFORMAT oldFmt = ((IWineD3DSurfaceImpl *) This->lastActiveRenderTarget)->resource.format;
 902     const WINED3DFORMAT newFmt = ((IWineD3DSurfaceImpl *) target)->resource.format;
 903     const struct StateEntry *StateTable = This->StateTable;
 904
 905     /* To compensate the lack of format switching with some offscreen rendering methods and on onscreen buffers
 906      * the alpha blend state changes with different render target formats
 907      */
 908     if(oldFmt != newFmt) {
 909         const GlPixelFormatDesc *glDesc;
 910         const StaticPixelFormatDesc *old = getFormatDescEntry(oldFmt, NULL, NULL);
 911         const StaticPixelFormatDesc *new = getFormatDescEntry(newFmt, &GLINFO_LOCATION, &glDesc);
 912
 913         /* Disable blending when the alphaMask has changed and when a format doesn't support blending */
 914         if((old->alphaMask && !new->alphaMask) || (!old->alphaMask && new->alphaMask) || !(glDesc->Flags & WINED3DFMT_FLAG_POSTPIXELSHADER_BLENDING)) {
 915             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
 916         }
 917     }
 918
 919     hr = IWineD3DSurface_GetContainer(target, &IID_IWineD3DSwapChain, (void **) &swapchain);
 920     if(hr == WINED3D_OK && swapchain) {
 921         TRACE("Rendering onscreen\n");
 922
 923         context = findThreadContextForSwapChain(swapchain, tid);
 924
 925         This->render_offscreen = FALSE;
 926         /* The context != This->activeContext will catch a NOP context change. This can occur
 927          * if we are switching back to swapchain rendering in case of FBO or Back Buffer offscreen
 928          * rendering. No context change is needed in that case
 929          */
 930
 931         if(wined3d_settings.offscreen_rendering_mode == ORM_PBUFFER) {
 932             if(This->pbufferContext && tid == This->pbufferContext->tid) {
 933                 This->pbufferContext->tid = 0;
 934             }
 935         }
 936         IWineD3DSwapChain_Release(swapchain);
 937
 938         if(oldRenderOffscreen) {
 939             Context_MarkStateDirty(context, WINED3DTS_PROJECTION, StateTable);
 940             Context_MarkStateDirty(context, STATE_VDECL, StateTable);
 941             Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
 942             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
 943             Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
 944         }
 945
 946     } else {
 947         TRACE("Rendering offscreen\n");
 948         This->render_offscreen = TRUE;
 949
 950         switch(wined3d_settings.offscreen_rendering_mode) {
 951             case ORM_FBO:
 952                 /* FBOs do not need a different context. Stay with whatever context is active at the moment */
 953                 if(This->activeContext && tid == This->lastThread) {
 954                     context = This->activeContext;
 955                 } else {
 956                     /* This may happen if the app jumps straight into offscreen rendering
 957                      * Start using the context of the primary swapchain. tid == 0 is no problem
 958                      * for findThreadContextForSwapChain.
 959                      *
 960                      * Can also happen on thread switches - in that case findThreadContextForSwapChain
 961                      * is perfect to call.
 962                      */
 963                     context = findThreadContextForSwapChain(This->swapchains[0], tid);
 964                 }
 965                 break;
 966
 967             case ORM_PBUFFER:
 968             {
 969                 IWineD3DSurfaceImpl *targetimpl = (IWineD3DSurfaceImpl *) target;
 970                 if(This->pbufferContext == NULL ||
 971                    This->pbufferWidth < targetimpl->currentDesc.Width ||
 972                    This->pbufferHeight < targetimpl->currentDesc.Height) {
 973                     if(This->pbufferContext) {
 974                         DestroyContext(This, This->pbufferContext);
 975                     }
 976
 977                     /* The display is irrelevant here, the window is 0. But CreateContext needs a valid X connection.
 978                      * Create the context on the same server as the primary swapchain. The primary swapchain is exists at this point.
 979                      */
 980                     This->pbufferContext = CreateContext(This, targetimpl,
 981                             ((IWineD3DSwapChainImpl *) This->swapchains[0])->context[0]->win_handle,
 982                             TRUE /* pbuffer */, &((IWineD3DSwapChainImpl *)This->swapchains[0])->presentParms);
 983                     This->pbufferWidth = targetimpl->currentDesc.Width;
 984                     This->pbufferHeight = targetimpl->currentDesc.Height;
 985                    }
 986
 987                    if(This->pbufferContext) {
 988                        if(This->pbufferContext->tid != 0 && This->pbufferContext->tid != tid) {
 989                            FIXME("The PBuffr context is only supported for one thread for now!\n");
 990                        }
 991                        This->pbufferContext->tid = tid;
 992                        context = This->pbufferContext;
 993                        break;
 994                    } else {
 995                        ERR("Failed to create a buffer context and drawable, falling back to back buffer offscreen rendering\n");
 996                        wined3d_settings.offscreen_rendering_mode = ORM_BACKBUFFER;
 997                    }
 998             }
 999
1000             case ORM_BACKBUFFER:
1001                 /* Stay with the currently active context for back buffer rendering */
1002                 if(This->activeContext && tid == This->lastThread) {
1003                     context = This->activeContext;
1004                 } else {
1005                     /* This may happen if the app jumps straight into offscreen rendering
1006                      * Start using the context of the primary swapchain. tid == 0 is no problem
1007                      * for findThreadContextForSwapChain.
1008                      *
1009                      * Can also happen on thread switches - in that case findThreadContextForSwapChain
1010                      * is perfect to call.
1011                      */
1012                     context = findThreadContextForSwapChain(This->swapchains[0], tid);
1013                 }
1014                 break;
1015         }
1016
1017         if(!oldRenderOffscreen) {
1018             Context_MarkStateDirty(context, WINED3DTS_PROJECTION, StateTable);
1019             Context_MarkStateDirty(context, STATE_VDECL, StateTable);
1020             Context_MarkStateDirty(context, STATE_VIEWPORT, StateTable);
1021             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
1022             Context_MarkStateDirty(context, STATE_FRONTFACE, StateTable);
1023         }
1024     }
1025
1026     /* When switching away from an offscreen render target, and we're not using FBOs,
1027      * we have to read the drawable into the texture. This is done via PreLoad(and
1028      * SFLAG_INDRAWABLE set on the surface). There are some things that need care though.
1029      * PreLoad needs a GL context, and FindContext is called before the context is activated.
1030      * It also has to be called with the old rendertarget active, otherwise a wrong drawable
1031      * is read. This leads to these possible situations:
1032      *
1033      * 0) lastActiveRenderTarget == target && oldTid == newTid:
1034      *    Nothing to do, we don't even reach this code in this case...
1035      *
1036      * 1) lastActiveRenderTarget != target && oldTid == newTid:
1037      *    The currently active context is OK for readback. Call PreLoad, and it
1038      *    performs the read
1039      *
1040      * 2) lastActiveRenderTarget == target && oldTid != newTid:
1041      *    Nothing to do - the drawable is unchanged
1042      *
1043      * 3) lastActiveRenderTarget != target && oldTid != newTid:
1044      *    This is tricky. We have to get a context with the old drawable from somewhere
1045      *    before we can switch to the new context. In this case, PreLoad calls
1046      *    ActivateContext(lastActiveRenderTarget) from the new(current) thread. This
1047      *    is case (2) then. The old drawable is activated for the new thread, and the
1048      *    readback can be done. The recursed ActivateContext does *not* call PreLoad again.
1049      *    After that, the outer ActivateContext(which calls PreLoad) can activate the new
1050      *    target for the new thread
1051      */
1052     if (readTexture && This->lastActiveRenderTarget != target) {
1053         BOOL oldInDraw = This->isInDraw;
1054
1055         /* PreLoad requires a context to load the texture, thus it will call ActivateContext.
1056          * Set the isInDraw to true to signal PreLoad that it has a context. Will be tricky
1057          * when using offscreen rendering with multithreading
1058          */
1059         This->isInDraw = TRUE;
1060
1061         /* Do that before switching the context:
1062          * Read the back buffer of the old drawable into the destination texture
1063          */
1064         IWineD3DSurface_PreLoad(This->lastActiveRenderTarget);
1065
1066         /* Assume that the drawable will be modified by some other things now */
1067         IWineD3DSurface_ModifyLocation(This->lastActiveRenderTarget, SFLAG_INDRAWABLE, FALSE);
1068
1069         This->isInDraw = oldInDraw;
1070     }
1071
1072     return context;
1073 }
1074
1075 static void apply_draw_buffer(IWineD3DDeviceImpl *This, IWineD3DSurface *target, BOOL blit)
1076 {
1077     HRESULT hr;
1078     IWineD3DSwapChain *swapchain;
1079
1080     hr = IWineD3DSurface_GetContainer(target, &IID_IWineD3DSwapChain, (void **)&swapchain);
1081     if (SUCCEEDED(hr))
1082     {
1083         IWineD3DSwapChain_Release((IUnknown *)swapchain);
1084         glDrawBuffer(surface_get_gl_buffer(target, swapchain));
1085         checkGLcall("glDrawBuffers()");
1086     }
1087     else
1088     {
1089         if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
1090         {
1091             if (!blit)
1092             {
1093                 if (GL_SUPPORT(ARB_DRAW_BUFFERS))
1094                 {
1095                     GL_EXTCALL(glDrawBuffersARB(GL_LIMITS(buffers), This->draw_buffers));
1096                     checkGLcall("glDrawBuffers()");
1097                 }
1098                 else
1099                 {
1100                     glDrawBuffer(This->draw_buffers[0]);
1101                     checkGLcall("glDrawBuffer()");
1102                 }
1103             } else {
1104                 glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
1105                 checkGLcall("glDrawBuffer()");
1106             }
1107         }
1108         else
1109         {
1110             glDrawBuffer(This->offscreenBuffer);
1111             checkGLcall("glDrawBuffer()");
1112         }
1113     }
1114 }
1115
1116 /*****************************************************************************
1117  * ActivateContext
1118  *
1119  * Finds a rendering context and drawable matching the device and render
1120  * target for the current thread, activates them and puts them into the
1121  * requested state.
1122  *
1123  * Params:
1124  *  This: Device to activate the context for
1125  *  target: Requested render target
1126  *  usage: Prepares the context for blitting, drawing or other actions
1127  *
1128  *****************************************************************************/
1129 void ActivateContext(IWineD3DDeviceImpl *This, IWineD3DSurface *target, ContextUsage usage) {
1130     DWORD                         tid = GetCurrentThreadId();
1131     int                           i;
1132     DWORD                         dirtyState, idx;
1133     BYTE                          shift;
1134     WineD3DContext                *context;
1135     const struct StateEntry       *StateTable = This->StateTable;
1136
1137     TRACE("(%p): Selecting context for render target %p, thread %d\n", This, target, tid);
1138     if(This->lastActiveRenderTarget != target || tid != This->lastThread) {
1139         context = FindContext(This, target, tid);
1140         context->draw_buffer_dirty = TRUE;
1141         This->lastActiveRenderTarget = target;
1142         This->lastThread = tid;
1143     } else {
1144         /* Stick to the old context */
1145         context = This->activeContext;
1146     }
1147
1148     /* Activate the opengl context */
1149     if(last_device != This || context != This->activeContext) {
1150         BOOL ret;
1151
1152         /* Prevent an unneeded context switch as those are expensive */
1153         if(context->glCtx && (context->glCtx == pwglGetCurrentContext())) {
1154             TRACE("Already using gl context %p\n", context->glCtx);
1155         }
1156         else {
1157             TRACE("Switching gl ctx to %p, hdc=%p ctx=%p\n", context, context->hdc, context->glCtx);
1158
1159             This->frag_pipe->enable_extension((IWineD3DDevice *) This, FALSE);
1160             ret = pwglMakeCurrent(context->hdc, context->glCtx);
1161             if(ret == FALSE) {
1162                 ERR("Failed to activate the new context\n");
1163             } else if(!context->last_was_blit) {
1164                 This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
1165             }
1166         }
1167         if(This->activeContext->vshader_const_dirty) {
1168             memset(This->activeContext->vshader_const_dirty, 1,
1169                    sizeof(*This->activeContext->vshader_const_dirty) * GL_LIMITS(vshader_constantsF));
1170         }
1171         if(This->activeContext->pshader_const_dirty) {
1172             memset(This->activeContext->pshader_const_dirty, 1,
1173                    sizeof(*This->activeContext->pshader_const_dirty) * GL_LIMITS(pshader_constantsF));
1174         }
1175         This->activeContext = context;
1176         last_device = This;
1177     }
1178
1179     /* We only need ENTER_GL for the gl calls made below and for the helper functions which make GL calls */
1180     ENTER_GL();
1181
1182     switch (usage) {
1183         case CTXUSAGE_CLEAR:
1184         case CTXUSAGE_DRAWPRIM:
1185             if (wined3d_settings.offscreen_rendering_mode == ORM_FBO) {
1186                 apply_fbo_state((IWineD3DDevice *)This);
1187             }
1188             if (context->draw_buffer_dirty) {
1189                 apply_draw_buffer(This, target, FALSE);
1190                 context->draw_buffer_dirty = FALSE;
1191             }
1192             break;
1193
1194         case CTXUSAGE_BLIT:
1195             if (wined3d_settings.offscreen_rendering_mode == ORM_FBO) {
1196                 if (This->render_offscreen) {
1197                     FIXME("Activating for CTXUSAGE_BLIT for an offscreen target with ORM_FBO. This should be avoided.\n");
1198                     bind_fbo((IWineD3DDevice *)This, GL_FRAMEBUFFER_EXT, &This->dst_fbo);
1199                     attach_surface_fbo(This, GL_FRAMEBUFFER_EXT, 0, target);
1200                     GL_EXTCALL(glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0));
1201                     checkGLcall("glFramebufferRenderbufferEXT");
1202                 } else {
1203                     GL_EXTCALL(glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0));
1204                     checkGLcall("glFramebufferRenderbufferEXT");
1205                 }
1206                 context->draw_buffer_dirty = TRUE;
1207             }
1208             if (context->draw_buffer_dirty) {
1209                 apply_draw_buffer(This, target, TRUE);
1210                 if (wined3d_settings.offscreen_rendering_mode != ORM_FBO) {
1211                     context->draw_buffer_dirty = FALSE;
1212                 }
1213             }
1214             break;
1215
1216         default:
1217             break;
1218     }
1219
1220     switch(usage) {
1221         case CTXUSAGE_RESOURCELOAD:
1222             /* This does not require any special states to be set up */
1223             break;
1224
1225         case CTXUSAGE_CLEAR:
1226             if(context->last_was_blit) {
1227                 This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
1228             }
1229
1230             /* Blending and clearing should be orthogonal, but tests on the nvidia driver show that disabling
1231              * blending when clearing improves the clearing performance incredibly.
1232              */
1233             glDisable(GL_BLEND);
1234             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_ALPHABLENDENABLE), StateTable);
1235
1236             glEnable(GL_SCISSOR_TEST);
1237             checkGLcall("glEnable GL_SCISSOR_TEST");
1238             context->last_was_blit = FALSE;
1239             Context_MarkStateDirty(context, STATE_RENDER(WINED3DRS_SCISSORTESTENABLE), StateTable);
1240             Context_MarkStateDirty(context, STATE_SCISSORRECT, StateTable);
1241             break;
1242
1243         case CTXUSAGE_DRAWPRIM:
1244             /* This needs all dirty states applied */
1245             if(context->last_was_blit) {
1246                 This->frag_pipe->enable_extension((IWineD3DDevice *) This, TRUE);
1247             }
1248
1249             IWineD3DDeviceImpl_FindTexUnitMap(This);
1250
1251             for(i=0; i < context->numDirtyEntries; i++) {
1252                 dirtyState = context->dirtyArray[i];
1253                 idx = dirtyState >> 5;
1254                 shift = dirtyState & 0x1f;
1255                 context->isStateDirty[idx] &= ~(1 << shift);
1256                 StateTable[dirtyState].apply(dirtyState, This->stateBlock, context);
1257             }
1258             context->numDirtyEntries = 0; /* This makes the whole list clean */
1259             context->last_was_blit = FALSE;
1260             break;
1261
1262         case CTXUSAGE_BLIT:
1263             SetupForBlit(This, context,
1264                          ((IWineD3DSurfaceImpl *)target)->currentDesc.Width,
1265                          ((IWineD3DSurfaceImpl *)target)->currentDesc.Height);
1266             break;
1267
1268         default:
1269             FIXME("Unexpected context usage requested\n");
1270     }
1271     LEAVE_GL();
1272 }