dlls/gdi32/opengl.c

   1 /*
   2  * OpenGL function forwarding to the display driver
   3  *
   4  * Copyright (c) 1999 Lionel Ulmer
   5  * Copyright (c) 2005 Raphael Junqueira
   6  * Copyright (c) 2006 Roderick Colenbrander
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winerror.h"
  34 #include "winternl.h"
  35 #include "winnt.h"
  36 #include "gdi_private.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(wgl);
  40
  41 static HDC default_hdc = 0;
  42
  43 typedef struct opengl_context
  44 {
  45     HDC hdc;
  46 } *OPENGL_Context;
  47
  48 /* We route all wgl functions from opengl32.dll through gdi32.dll to
  49  * the display driver. Various wgl calls have a hDC as one of their parameters.
  50  * Using get_dc_ptr we get access to the functions exported by the driver.
  51  * Some functions don't receive a hDC. This function creates a global hdc and
  52  * if there's already a global hdc, it returns it.
  53  */
  54 static DC* OPENGL_GetDefaultDC(void)
  55 {
  56     if(!default_hdc)
  57         default_hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
  58
  59     return get_dc_ptr(default_hdc);
  60 }
  61
  62 /***********************************************************************
  63  *              wglCopyContext (OPENGL32.@)
  64  */
  65 BOOL WINAPI wglCopyContext(HGLRC hglrcSrc, HGLRC hglrcDst, UINT mask)
  66 {
  67     DC *dc;
  68     BOOL ret = FALSE;
  69     OPENGL_Context ctx = (OPENGL_Context)hglrcSrc;
  70
  71     TRACE("hglrcSrc: (%p), hglrcDst: (%p), mask: %#x\n", hglrcSrc, hglrcDst, mask);
  72     /* If no context is set, this call doesn't have a purpose */
  73     if(!hglrcSrc || !hglrcDst)
  74         return FALSE;
  75
  76     /* Retrieve the HDC associated with the context to access the display driver */
  77     dc = get_dc_ptr(ctx->hdc);
  78     if (dc)
  79     {
  80         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglCopyContext );
  81         ret = physdev->funcs->pwglCopyContext(hglrcSrc, hglrcDst, mask);
  82         release_dc_ptr( dc );
  83     }
  84     return ret;
  85 }
  86
  87 /***********************************************************************
  88  *              wglCreateContext (OPENGL32.@)
  89  */
  90 HGLRC WINAPI wglCreateContext(HDC hdc)
  91 {
  92     HGLRC ret = 0;
  93     DC * dc = get_dc_ptr( hdc );
  94
  95     TRACE("(%p)\n",hdc);
  96
  97     if (dc)
  98     {
  99         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglCreateContext );
 100         update_dc( dc );
 101         ret = physdev->funcs->pwglCreateContext( physdev );
 102         release_dc_ptr( dc );
 103     }
 104     return ret;
 105 }
 106
 107 /***********************************************************************
 108  *      wglCreateContextAttribsARB
 109  */
 110 static HGLRC WINAPI wglCreateContextAttribsARB(HDC hdc, HGLRC hShareContext, const int *attributeList)
 111 {
 112     HGLRC ret = 0;
 113     DC * dc = get_dc_ptr( hdc );
 114
 115     TRACE("(%p)\n",hdc);
 116
 117     if (dc)
 118     {
 119         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglCreateContextAttribsARB );
 120         update_dc( dc );
 121         ret = physdev->funcs->pwglCreateContextAttribsARB( physdev, hShareContext, attributeList );
 122         release_dc_ptr( dc );
 123     }
 124     return ret;
 125 }
 126
 127 /***********************************************************************
 128  *              wglDeleteContext (OPENGL32.@)
 129  */
 130 BOOL WINAPI wglDeleteContext(HGLRC hglrc)
 131 {
 132     DC *dc;
 133     BOOL ret = FALSE;
 134     OPENGL_Context ctx = (OPENGL_Context)hglrc;
 135
 136     TRACE("hglrc: (%p)\n", hglrc);
 137     if(ctx == NULL)
 138     {
 139         SetLastError(ERROR_INVALID_HANDLE);
 140         return FALSE;
 141     }
 142
 143     /* Retrieve the HDC associated with the context to access the display driver */
 144     dc = get_dc_ptr(ctx->hdc);
 145     if (dc)
 146     {
 147         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglDeleteContext );
 148         ret = physdev->funcs->pwglDeleteContext( hglrc );
 149         release_dc_ptr( dc );
 150     }
 151     else SetLastError(ERROR_INVALID_HANDLE);
 152     return ret;
 153 }
 154
 155 /***********************************************************************
 156  *              wglGetCurrentContext (OPENGL32.@)
 157  */
 158 HGLRC WINAPI wglGetCurrentContext(void)
 159 {
 160     HGLRC ret = NtCurrentTeb()->glContext;
 161     TRACE(" returning %p\n", ret);
 162     return ret;
 163 }
 164
 165 /***********************************************************************
 166  *              wglGetCurrentDC (OPENGL32.@)
 167  */
 168 HDC WINAPI wglGetCurrentDC(void)
 169 {
 170     OPENGL_Context ctx = (OPENGL_Context)wglGetCurrentContext();
 171
 172     TRACE(" found context: %p\n", ctx);
 173     if(ctx == NULL)
 174         return NULL;
 175
 176     /* Retrieve the current DC from the active context */
 177     TRACE(" returning hdc: %p\n", ctx->hdc);
 178     return ctx->hdc;
 179 }
 180
 181 /***********************************************************************
 182  *              wglGetPbufferDCARB
 183  */
 184 static HDC WINAPI wglGetPbufferDCARB(void *pbuffer)
 185 {
 186     HDC ret = 0;
 187
 188     /* Create a device context to associate with the pbuffer */
 189     HDC hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
 190     DC *dc = get_dc_ptr(hdc);
 191
 192     TRACE("(%p)\n", pbuffer);
 193
 194     if (dc)
 195     {
 196         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglGetPbufferDCARB );
 197
 198         /* The display driver has to do the rest of the work because
 199          * we need access to lowlevel datatypes which we can't access here
 200          */
 201         ret = physdev->funcs->pwglGetPbufferDCARB( physdev, pbuffer );
 202         release_dc_ptr( dc );
 203     }
 204     TRACE("(%p), hdc=%p\n", pbuffer, ret);
 205     if (!ret) DeleteDC( hdc );
 206     return ret;
 207 }
 208
 209 /***********************************************************************
 210  *              wglMakeCurrent (OPENGL32.@)
 211  */
 212 BOOL WINAPI wglMakeCurrent(HDC hdc, HGLRC hglrc)
 213 {
 214     BOOL ret = FALSE;
 215     DC * dc = NULL;
 216
 217     /* When the context hglrc is NULL, the HDC is ignored and can be NULL.
 218      * In that case use the global hDC to get access to the driver.  */
 219     if(hglrc == NULL)
 220     {
 221         if( hdc == NULL && !wglGetCurrentContext() )
 222         {
 223             WARN( "Current context is NULL\n");
 224             SetLastError( ERROR_INVALID_HANDLE );
 225             return FALSE;
 226         }
 227         dc = OPENGL_GetDefaultDC();
 228     }
 229     else
 230         dc = get_dc_ptr( hdc );
 231
 232     TRACE("hdc: (%p), hglrc: (%p)\n", hdc, hglrc);
 233
 234     if (dc)
 235     {
 236         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglMakeCurrent );
 237         update_dc( dc );
 238         ret = physdev->funcs->pwglMakeCurrent( physdev, hglrc );
 239         release_dc_ptr( dc );
 240     }
 241     return ret;
 242 }
 243
 244 /***********************************************************************
 245  *              wglMakeContextCurrentARB
 246  */
 247 static BOOL WINAPI wglMakeContextCurrentARB(HDC hDrawDC, HDC hReadDC, HGLRC hglrc)
 248 {
 249     BOOL ret = FALSE;
 250     PHYSDEV draw_physdev, read_physdev;
 251     DC *DrawDC;
 252     DC *ReadDC;
 253
 254     TRACE("hDrawDC: (%p), hReadDC: (%p) hglrc: (%p)\n", hDrawDC, hReadDC, hglrc);
 255
 256     /* Both hDrawDC and hReadDC need to be valid */
 257     DrawDC = get_dc_ptr( hDrawDC );
 258     if (!DrawDC) return FALSE;
 259
 260     ReadDC = get_dc_ptr( hReadDC );
 261     if (!ReadDC) {
 262         release_dc_ptr( DrawDC );
 263         return FALSE;
 264     }
 265
 266     update_dc( DrawDC );
 267     update_dc( ReadDC );
 268     draw_physdev = GET_DC_PHYSDEV( DrawDC, pwglMakeContextCurrentARB );
 269     read_physdev = GET_DC_PHYSDEV( ReadDC, pwglMakeContextCurrentARB );
 270     if (draw_physdev->funcs == read_physdev->funcs)
 271         ret = draw_physdev->funcs->pwglMakeContextCurrentARB(draw_physdev, read_physdev, hglrc);
 272     release_dc_ptr( DrawDC );
 273     release_dc_ptr( ReadDC );
 274     return ret;
 275 }
 276
 277 /**************************************************************************************
 278  *      WINE-specific wglSetPixelFormat which can set the iPixelFormat multiple times
 279  *
 280  */
 281 static BOOL WINAPI wglSetPixelFormatWINE(HDC hdc, int iPixelFormat, const PIXELFORMATDESCRIPTOR *ppfd)
 282 {
 283     INT bRet = FALSE;
 284     DC * dc = get_dc_ptr( hdc );
 285
 286     TRACE("(%p,%d,%p)\n", hdc, iPixelFormat, ppfd);
 287
 288     if (dc)
 289     {
 290         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglSetPixelFormatWINE );
 291         update_dc( dc );
 292         bRet = physdev->funcs->pwglSetPixelFormatWINE( physdev, iPixelFormat, ppfd );
 293         release_dc_ptr( dc );
 294     }
 295     return bRet;
 296 }
 297
 298 /***********************************************************************
 299  *              wglShareLists (OPENGL32.@)
 300  */
 301 BOOL WINAPI wglShareLists(HGLRC hglrc1, HGLRC hglrc2)
 302 {
 303     DC *dc;
 304     BOOL ret = FALSE;
 305     OPENGL_Context ctx = (OPENGL_Context)hglrc1;
 306
 307     TRACE("hglrc1: (%p); hglrc: (%p)\n", hglrc1, hglrc2);
 308     if(ctx == NULL || hglrc2 == NULL)
 309         return FALSE;
 310
 311     /* Retrieve the HDC associated with the context to access the display driver */
 312     dc = get_dc_ptr(ctx->hdc);
 313     if (dc)
 314     {
 315         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglShareLists );
 316         ret = physdev->funcs->pwglShareLists( hglrc1, hglrc2 );
 317         release_dc_ptr( dc );
 318     }
 319     return ret;
 320 }
 321
 322 /***********************************************************************
 323  *              wglUseFontBitmapsA (OPENGL32.@)
 324  */
 325 BOOL WINAPI wglUseFontBitmapsA(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 326 {
 327     BOOL ret = FALSE;
 328     DC * dc = get_dc_ptr( hdc );
 329
 330     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 331
 332     if (dc)
 333     {
 334         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglUseFontBitmapsA );
 335         ret = physdev->funcs->pwglUseFontBitmapsA( physdev, first, count, listBase );
 336         release_dc_ptr( dc );
 337     }
 338     return ret;
 339 }
 340
 341 /***********************************************************************
 342  *              wglUseFontBitmapsW (OPENGL32.@)
 343  */
 344 BOOL WINAPI wglUseFontBitmapsW(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 345 {
 346     BOOL ret = FALSE;
 347     DC * dc = get_dc_ptr( hdc );
 348
 349     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 350
 351     if (dc)
 352     {
 353         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglUseFontBitmapsW );
 354         ret = physdev->funcs->pwglUseFontBitmapsW( physdev, first, count, listBase );
 355         release_dc_ptr( dc );
 356     }
 357     return ret;
 358 }
 359
 360 /***********************************************************************
 361  *              Internal wglGetProcAddress for retrieving WGL extensions
 362  */
 363 PROC WINAPI wglGetProcAddress(LPCSTR func)
 364 {
 365     PROC ret = NULL;
 366     DC *dc;
 367
 368     if(!func)
 369         return NULL;
 370
 371     TRACE("func: '%s'\n", func);
 372
 373     /* Retrieve the global hDC to get access to the driver.  */
 374     dc = OPENGL_GetDefaultDC();
 375     if (dc)
 376     {
 377         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pwglGetProcAddress );
 378         ret = physdev->funcs->pwglGetProcAddress(func);
 379         release_dc_ptr( dc );
 380     }
 381
 382     /* At the moment we implement one WGL extension which requires a HDC. When we
 383      * are looking up this call and when the Extension is available (that is the case
 384      * when a non-NULL value is returned by wglGetProcAddress), we return the address
 385      * of a wrapper function which will handle the HDC->PhysDev conversion.
 386      */
 387     if(ret && strcmp(func, "wglCreateContextAttribsARB") == 0)
 388         return (PROC)wglCreateContextAttribsARB;
 389     else if(ret && strcmp(func, "wglMakeContextCurrentARB") == 0)
 390         return (PROC)wglMakeContextCurrentARB;
 391     else if(ret && strcmp(func, "wglGetPbufferDCARB") == 0)
 392         return (PROC)wglGetPbufferDCARB;
 393     else if(ret && strcmp(func, "wglSetPixelFormatWINE") == 0)
 394         return (PROC)wglSetPixelFormatWINE;
 395
 396     return ret;
 397 }