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  *              wglCreateContext (OPENGL32.@)
  64  */
  65 HGLRC WINAPI wglCreateContext(HDC hdc)
  66 {
  67     HGLRC ret = 0;
  68     DC * dc = get_dc_ptr( hdc );
  69
  70     TRACE("(%p)\n",hdc);
  71
  72     if (!dc) return 0;
  73
  74     update_dc( dc );
  75     if (!dc->funcs->pwglCreateContext) FIXME(" :stub\n");
  76     else ret = dc->funcs->pwglCreateContext(dc->physDev);
  77
  78     release_dc_ptr( dc );
  79     return ret;
  80 }
  81
  82
  83 /***********************************************************************
  84  *              wglDeleteContext (OPENGL32.@)
  85  */
  86 BOOL WINAPI wglDeleteContext(HGLRC hglrc)
  87 {
  88     DC *dc;
  89     BOOL ret = FALSE;
  90     OPENGL_Context ctx = (OPENGL_Context)hglrc;
  91
  92     TRACE("hglrc: (%p)\n", hglrc);
  93     if(ctx == NULL)
  94         return FALSE;
  95
  96     /* Retrieve the HDC associated with the context to access the display driver */
  97     dc = get_dc_ptr(ctx->hdc);
  98     if (!dc) return FALSE;
  99
 100     if (!dc->funcs->pwglDeleteContext) FIXME(" :stub\n");
 101     else ret = dc->funcs->pwglDeleteContext(hglrc);
 102
 103     release_dc_ptr( dc );
 104     return ret;
 105 }
 106
 107 /***********************************************************************
 108  *              wglGetCurrentContext (OPENGL32.@)
 109  */
 110 HGLRC WINAPI wglGetCurrentContext(void)
 111 {
 112     HGLRC ret = NtCurrentTeb()->glContext;
 113     TRACE(" returning %p\n", ret);
 114     return ret;
 115 }
 116
 117 /***********************************************************************
 118  *              wglGetCurrentDC (OPENGL32.@)
 119  */
 120 HDC WINAPI wglGetCurrentDC(void)
 121 {
 122     OPENGL_Context ctx = (OPENGL_Context)wglGetCurrentContext();
 123
 124     TRACE(" found context: %p\n", ctx);
 125     if(ctx == NULL)
 126         return NULL;
 127
 128     /* Retrieve the current DC from the active context */
 129     TRACE(" returning hdc: %p\n", ctx->hdc);
 130     return ctx->hdc;
 131 }
 132
 133 /***********************************************************************
 134  *              wglGetPbufferDCARB
 135  */
 136 static HDC WINAPI wglGetPbufferDCARB(void *pbuffer)
 137 {
 138     HDC ret = 0;
 139
 140     /* Create a device context to associate with the pbuffer */
 141     HDC hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
 142     DC *dc = get_dc_ptr(hdc);
 143
 144     TRACE("(%p)\n", pbuffer);
 145
 146     if (!dc) return FALSE;
 147
 148     /* The display driver has to do the rest of the work because
 149      * we need access to lowlevel datatypes which we can't access here
 150      */
 151     if (!dc->funcs->pwglGetPbufferDCARB) FIXME(" :stub\n");
 152     else ret = dc->funcs->pwglGetPbufferDCARB(dc->physDev, pbuffer);
 153
 154     TRACE("(%p), hdc=%p\n", pbuffer, ret);
 155
 156     release_dc_ptr( dc );
 157     return ret;
 158 }
 159
 160 /***********************************************************************
 161  *              wglMakeCurrent (OPENGL32.@)
 162  */
 163 BOOL WINAPI wglMakeCurrent(HDC hdc, HGLRC hglrc)
 164 {
 165     BOOL ret = FALSE;
 166     DC * dc = NULL;
 167
 168     /* When the context hglrc is NULL, the HDC is ignored and can be NULL.
 169      * In that case use the global hDC to get access to the driver.  */
 170     if(hglrc == NULL)
 171         dc = OPENGL_GetDefaultDC();
 172     else
 173         dc = get_dc_ptr( hdc );
 174
 175     TRACE("hdc: (%p), hglrc: (%p)\n", hdc, hglrc);
 176
 177     if (!dc) return FALSE;
 178
 179     update_dc( dc );
 180     if (!dc->funcs->pwglMakeCurrent) FIXME(" :stub\n");
 181     else ret = dc->funcs->pwglMakeCurrent(dc->physDev,hglrc);
 182
 183     release_dc_ptr( dc );
 184     return ret;
 185 }
 186
 187 /***********************************************************************
 188  *              wglMakeContextCurrentARB
 189  */
 190 static BOOL WINAPI wglMakeContextCurrentARB(HDC hDrawDC, HDC hReadDC, HGLRC hglrc)
 191 {
 192     BOOL ret = FALSE;
 193     DC *DrawDC;
 194     DC *ReadDC;
 195
 196     TRACE("hDrawDC: (%p), hReadDC: (%p) hglrc: (%p)\n", hDrawDC, hReadDC, hglrc);
 197
 198     /* Both hDrawDC and hReadDC need to be valid */
 199     DrawDC = get_dc_ptr( hDrawDC );
 200     if (!DrawDC) return FALSE;
 201
 202     ReadDC = get_dc_ptr( hReadDC );
 203     if (!ReadDC) {
 204         release_dc_ptr( DrawDC );
 205         return FALSE;
 206     }
 207
 208     update_dc( DrawDC );
 209     update_dc( ReadDC );
 210     if (!DrawDC->funcs->pwglMakeContextCurrentARB) FIXME(" :stub\n");
 211     else ret = DrawDC->funcs->pwglMakeContextCurrentARB(DrawDC->physDev, ReadDC->physDev, hglrc);
 212
 213     release_dc_ptr( DrawDC );
 214     release_dc_ptr( ReadDC );
 215     return ret;
 216 }
 217
 218 /***********************************************************************
 219  *              wglShareLists (OPENGL32.@)
 220  */
 221 BOOL WINAPI wglShareLists(HGLRC hglrc1, HGLRC hglrc2)
 222 {
 223     DC *dc;
 224     BOOL ret = FALSE;
 225     OPENGL_Context ctx = (OPENGL_Context)hglrc1;
 226
 227     TRACE("hglrc1: (%p); hglrc: (%p)\n", hglrc1, hglrc2);
 228     if(ctx == NULL)
 229         return FALSE;
 230
 231     /* Retrieve the HDC associated with the context to access the display driver */
 232     dc = get_dc_ptr(ctx->hdc);
 233     if (!dc) return FALSE;
 234
 235     if (!dc->funcs->pwglShareLists) FIXME(" :stub\n");
 236     else ret = dc->funcs->pwglShareLists(hglrc1, hglrc2);
 237
 238     release_dc_ptr( dc );
 239     return ret;
 240 }
 241
 242 /***********************************************************************
 243  *              wglUseFontBitmapsA (OPENGL32.@)
 244  */
 245 BOOL WINAPI wglUseFontBitmapsA(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 246 {
 247     BOOL ret = FALSE;
 248     DC * dc = get_dc_ptr( hdc );
 249
 250     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 251
 252     if (!dc) return FALSE;
 253
 254     if (!dc->funcs->pwglUseFontBitmapsA) FIXME(" :stub\n");
 255     else ret = dc->funcs->pwglUseFontBitmapsA(dc->physDev, first, count, listBase);
 256
 257     release_dc_ptr( dc );
 258     return ret;
 259 }
 260
 261 /***********************************************************************
 262  *              wglUseFontBitmapsW (OPENGL32.@)
 263  */
 264 BOOL WINAPI wglUseFontBitmapsW(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 265 {
 266     BOOL ret = FALSE;
 267     DC * dc = get_dc_ptr( hdc );
 268
 269     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 270
 271     if (!dc) return FALSE;
 272
 273     if (!dc->funcs->pwglUseFontBitmapsW) FIXME(" :stub\n");
 274     else ret = dc->funcs->pwglUseFontBitmapsW(dc->physDev, first, count, listBase);
 275
 276     release_dc_ptr( dc );
 277     return ret;
 278 }
 279
 280 /***********************************************************************
 281  *              Internal wglGetProcAddress for retrieving WGL extensions
 282  */
 283 PROC WINAPI wglGetProcAddress(LPCSTR func)
 284 {
 285     PROC ret = NULL;
 286     DC *dc;
 287
 288     if(!func)
 289         return NULL;
 290
 291     TRACE("func: '%s'\n", func);
 292
 293     /* Retrieve the global hDC to get access to the driver.  */
 294     dc = OPENGL_GetDefaultDC();
 295     if (!dc) return FALSE;
 296
 297     if (!dc->funcs->pwglGetProcAddress) FIXME(" :stub\n");
 298     else ret = dc->funcs->pwglGetProcAddress(func);
 299
 300     release_dc_ptr( dc );
 301
 302     /* At the moment we implement one WGL extension which requires a HDC. When we
 303      * are looking up this call and when the Extension is available (that is the case
 304      * when a non-NULL value is returned by wglGetProcAddress), we return the address
 305      * of a wrapper function which will handle the HDC->PhysDev conversion.
 306      */
 307     if(ret && strcmp(func, "wglMakeContextCurrentARB") == 0)
 308         return (PROC)wglMakeContextCurrentARB;
 309     else if(ret && strcmp(func, "wglGetPbufferDCARB") == 0)
 310         return (PROC)wglGetPbufferDCARB;
 311
 312     return ret;
 313 }