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) return FALSE;
  79
  80     if (!dc->funcs->pwglCopyContext) FIXME(" :stub\n");
  81     else ret = dc->funcs->pwglCopyContext(hglrcSrc, hglrcDst, mask);
  82
  83     release_dc_ptr( dc );
  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) return 0;
  98
  99     update_dc( dc );
 100     if (!dc->funcs->pwglCreateContext) FIXME(" :stub\n");
 101     else ret = dc->funcs->pwglCreateContext(dc->physDev);
 102
 103     release_dc_ptr( dc );
 104     return ret;
 105 }
 106
 107
 108 /***********************************************************************
 109  *              wglDeleteContext (OPENGL32.@)
 110  */
 111 BOOL WINAPI wglDeleteContext(HGLRC hglrc)
 112 {
 113     DC *dc;
 114     BOOL ret = FALSE;
 115     OPENGL_Context ctx = (OPENGL_Context)hglrc;
 116
 117     TRACE("hglrc: (%p)\n", hglrc);
 118     if(ctx == NULL)
 119         return FALSE;
 120
 121     /* Retrieve the HDC associated with the context to access the display driver */
 122     dc = get_dc_ptr(ctx->hdc);
 123     if (!dc) return FALSE;
 124
 125     if (!dc->funcs->pwglDeleteContext) FIXME(" :stub\n");
 126     else ret = dc->funcs->pwglDeleteContext(hglrc);
 127
 128     release_dc_ptr( dc );
 129     return ret;
 130 }
 131
 132 /***********************************************************************
 133  *              wglGetCurrentContext (OPENGL32.@)
 134  */
 135 HGLRC WINAPI wglGetCurrentContext(void)
 136 {
 137     HGLRC ret = NtCurrentTeb()->glContext;
 138     TRACE(" returning %p\n", ret);
 139     return ret;
 140 }
 141
 142 /***********************************************************************
 143  *              wglGetCurrentDC (OPENGL32.@)
 144  */
 145 HDC WINAPI wglGetCurrentDC(void)
 146 {
 147     OPENGL_Context ctx = (OPENGL_Context)wglGetCurrentContext();
 148
 149     TRACE(" found context: %p\n", ctx);
 150     if(ctx == NULL)
 151         return NULL;
 152
 153     /* Retrieve the current DC from the active context */
 154     TRACE(" returning hdc: %p\n", ctx->hdc);
 155     return ctx->hdc;
 156 }
 157
 158 /***********************************************************************
 159  *              wglGetPbufferDCARB
 160  */
 161 static HDC WINAPI wglGetPbufferDCARB(void *pbuffer)
 162 {
 163     HDC ret = 0;
 164
 165     /* Create a device context to associate with the pbuffer */
 166     HDC hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
 167     DC *dc = get_dc_ptr(hdc);
 168
 169     TRACE("(%p)\n", pbuffer);
 170
 171     if (!dc) return FALSE;
 172
 173     /* The display driver has to do the rest of the work because
 174      * we need access to lowlevel datatypes which we can't access here
 175      */
 176     if (!dc->funcs->pwglGetPbufferDCARB) FIXME(" :stub\n");
 177     else ret = dc->funcs->pwglGetPbufferDCARB(dc->physDev, pbuffer);
 178
 179     TRACE("(%p), hdc=%p\n", pbuffer, ret);
 180
 181     release_dc_ptr( dc );
 182     return ret;
 183 }
 184
 185 /***********************************************************************
 186  *              wglMakeCurrent (OPENGL32.@)
 187  */
 188 BOOL WINAPI wglMakeCurrent(HDC hdc, HGLRC hglrc)
 189 {
 190     BOOL ret = FALSE;
 191     DC * dc = NULL;
 192
 193     /* When the context hglrc is NULL, the HDC is ignored and can be NULL.
 194      * In that case use the global hDC to get access to the driver.  */
 195     if(hglrc == NULL)
 196         dc = OPENGL_GetDefaultDC();
 197     else
 198         dc = get_dc_ptr( hdc );
 199
 200     TRACE("hdc: (%p), hglrc: (%p)\n", hdc, hglrc);
 201
 202     if (!dc) return FALSE;
 203
 204     update_dc( dc );
 205     if (!dc->funcs->pwglMakeCurrent) FIXME(" :stub\n");
 206     else ret = dc->funcs->pwglMakeCurrent(dc->physDev,hglrc);
 207
 208     release_dc_ptr( dc );
 209     return ret;
 210 }
 211
 212 /***********************************************************************
 213  *              wglMakeContextCurrentARB
 214  */
 215 static BOOL WINAPI wglMakeContextCurrentARB(HDC hDrawDC, HDC hReadDC, HGLRC hglrc)
 216 {
 217     BOOL ret = FALSE;
 218     DC *DrawDC;
 219     DC *ReadDC;
 220
 221     TRACE("hDrawDC: (%p), hReadDC: (%p) hglrc: (%p)\n", hDrawDC, hReadDC, hglrc);
 222
 223     /* Both hDrawDC and hReadDC need to be valid */
 224     DrawDC = get_dc_ptr( hDrawDC );
 225     if (!DrawDC) return FALSE;
 226
 227     ReadDC = get_dc_ptr( hReadDC );
 228     if (!ReadDC) {
 229         release_dc_ptr( DrawDC );
 230         return FALSE;
 231     }
 232
 233     update_dc( DrawDC );
 234     update_dc( ReadDC );
 235     if (!DrawDC->funcs->pwglMakeContextCurrentARB) FIXME(" :stub\n");
 236     else ret = DrawDC->funcs->pwglMakeContextCurrentARB(DrawDC->physDev, ReadDC->physDev, hglrc);
 237
 238     release_dc_ptr( DrawDC );
 239     release_dc_ptr( ReadDC );
 240     return ret;
 241 }
 242
 243 /***********************************************************************
 244  *              wglShareLists (OPENGL32.@)
 245  */
 246 BOOL WINAPI wglShareLists(HGLRC hglrc1, HGLRC hglrc2)
 247 {
 248     DC *dc;
 249     BOOL ret = FALSE;
 250     OPENGL_Context ctx = (OPENGL_Context)hglrc1;
 251
 252     TRACE("hglrc1: (%p); hglrc: (%p)\n", hglrc1, hglrc2);
 253     if(ctx == NULL)
 254         return FALSE;
 255
 256     /* Retrieve the HDC associated with the context to access the display driver */
 257     dc = get_dc_ptr(ctx->hdc);
 258     if (!dc) return FALSE;
 259
 260     if (!dc->funcs->pwglShareLists) FIXME(" :stub\n");
 261     else ret = dc->funcs->pwglShareLists(hglrc1, hglrc2);
 262
 263     release_dc_ptr( dc );
 264     return ret;
 265 }
 266
 267 /***********************************************************************
 268  *              wglUseFontBitmapsA (OPENGL32.@)
 269  */
 270 BOOL WINAPI wglUseFontBitmapsA(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 271 {
 272     BOOL ret = FALSE;
 273     DC * dc = get_dc_ptr( hdc );
 274
 275     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 276
 277     if (!dc) return FALSE;
 278
 279     if (!dc->funcs->pwglUseFontBitmapsA) FIXME(" :stub\n");
 280     else ret = dc->funcs->pwglUseFontBitmapsA(dc->physDev, first, count, listBase);
 281
 282     release_dc_ptr( dc );
 283     return ret;
 284 }
 285
 286 /***********************************************************************
 287  *              wglUseFontBitmapsW (OPENGL32.@)
 288  */
 289 BOOL WINAPI wglUseFontBitmapsW(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 290 {
 291     BOOL ret = FALSE;
 292     DC * dc = get_dc_ptr( hdc );
 293
 294     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 295
 296     if (!dc) return FALSE;
 297
 298     if (!dc->funcs->pwglUseFontBitmapsW) FIXME(" :stub\n");
 299     else ret = dc->funcs->pwglUseFontBitmapsW(dc->physDev, first, count, listBase);
 300
 301     release_dc_ptr( dc );
 302     return ret;
 303 }
 304
 305 /***********************************************************************
 306  *              Internal wglGetProcAddress for retrieving WGL extensions
 307  */
 308 PROC WINAPI wglGetProcAddress(LPCSTR func)
 309 {
 310     PROC ret = NULL;
 311     DC *dc;
 312
 313     if(!func)
 314         return NULL;
 315
 316     TRACE("func: '%s'\n", func);
 317
 318     /* Retrieve the global hDC to get access to the driver.  */
 319     dc = OPENGL_GetDefaultDC();
 320     if (!dc) return FALSE;
 321
 322     if (!dc->funcs->pwglGetProcAddress) FIXME(" :stub\n");
 323     else ret = dc->funcs->pwglGetProcAddress(func);
 324
 325     release_dc_ptr( dc );
 326
 327     /* At the moment we implement one WGL extension which requires a HDC. When we
 328      * are looking up this call and when the Extension is available (that is the case
 329      * when a non-NULL value is returned by wglGetProcAddress), we return the address
 330      * of a wrapper function which will handle the HDC->PhysDev conversion.
 331      */
 332     if(ret && strcmp(func, "wglMakeContextCurrentARB") == 0)
 333         return (PROC)wglMakeContextCurrentARB;
 334     else if(ret && strcmp(func, "wglGetPbufferDCARB") == 0)
 335         return (PROC)wglGetPbufferDCARB;
 336
 337     return ret;
 338 }