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 DC_GetDCPtr 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 DC_GetDCPtr(default_hdc);
  60 }
  61
  62 /***********************************************************************
  63  *              wglCreateContext (OPENGL32.@)
  64  */
  65 HGLRC WINAPI wglCreateContext(HDC hdc)
  66 {
  67     HGLRC ret = 0;
  68     DC * dc = DC_GetDCPtr( hdc );
  69
  70     TRACE("(%p)\n",hdc);
  71
  72     if (!dc) return 0;
  73
  74     if (!dc->funcs->pwglCreateContext) FIXME(" :stub\n");
  75     else ret = dc->funcs->pwglCreateContext(dc->physDev);
  76
  77     DC_ReleaseDCPtr( dc );
  78     return ret;
  79 }
  80
  81
  82 /***********************************************************************
  83  *              wglDeleteContext (OPENGL32.@)
  84  */
  85 BOOL WINAPI wglDeleteContext(HGLRC hglrc)
  86 {
  87     DC *dc;
  88     BOOL ret = FALSE;
  89     OPENGL_Context ctx = (OPENGL_Context)hglrc;
  90
  91     TRACE("hglrc: (%p)\n", hglrc);
  92     if(ctx == NULL)
  93         return FALSE;
  94
  95     /* Retrieve the HDC associated with the context to access the display driver */
  96     dc = DC_GetDCPtr(ctx->hdc);
  97     if (!dc) return FALSE;
  98
  99     if (!dc->funcs->pwglDeleteContext) FIXME(" :stub\n");
 100     else ret = dc->funcs->pwglDeleteContext(hglrc);
 101
 102     DC_ReleaseDCPtr( dc );
 103     return ret;
 104 }
 105
 106 /***********************************************************************
 107  *              wglGetCurrentContext (OPENGL32.@)
 108  */
 109 HGLRC WINAPI wglGetCurrentContext(void)
 110 {
 111     HGLRC ret = NtCurrentTeb()->glContext;
 112     TRACE(" returning %p\n", ret);
 113     return ret;
 114 }
 115
 116 /***********************************************************************
 117  *              wglGetCurrentDC (OPENGL32.@)
 118  */
 119 HDC WINAPI wglGetCurrentDC(void)
 120 {
 121     OPENGL_Context ctx = (OPENGL_Context)wglGetCurrentContext();
 122
 123     TRACE(" found context: %p\n", ctx);
 124     if(ctx == NULL)
 125         return NULL;
 126
 127     /* Retrieve the current DC from the active context */
 128     TRACE(" returning hdc: %p\n", ctx->hdc);
 129     return ctx->hdc;
 130 }
 131
 132 /***********************************************************************
 133  *              wglGetPbufferDCARB
 134  */
 135 static HDC WINAPI wglGetPbufferDCARB(void *pbuffer)
 136 {
 137     HDC ret = 0;
 138
 139     /* Create a device context to associate with the pbuffer */
 140     HDC hdc = CreateDCA("DISPLAY", NULL, NULL, NULL);
 141     DC *dc = DC_GetDCPtr(hdc);
 142
 143     TRACE("(%p)\n", pbuffer);
 144
 145     if (!dc) return FALSE;
 146
 147     /* The display driver has to do the rest of the work because
 148      * we need access to lowlevel datatypes which we can't access here
 149      */
 150     if (!dc->funcs->pwglGetPbufferDCARB) FIXME(" :stub\n");
 151     else ret = dc->funcs->pwglGetPbufferDCARB(dc->physDev, pbuffer);
 152
 153     TRACE("(%p), hdc=%p\n", pbuffer, ret);
 154
 155     DC_ReleaseDCPtr( dc );
 156     return ret;
 157 }
 158
 159 /***********************************************************************
 160  *              wglMakeCurrent (OPENGL32.@)
 161  */
 162 BOOL WINAPI wglMakeCurrent(HDC hdc, HGLRC hglrc)
 163 {
 164     BOOL ret = FALSE;
 165     DC * dc = NULL;
 166
 167     /* When the context hglrc is NULL, the HDC is ignored and can be NULL.
 168      * In that case use the global hDC to get access to the driver.  */
 169     if(hglrc == NULL)
 170         dc = OPENGL_GetDefaultDC();
 171     else
 172         dc = DC_GetDCUpdate( hdc );
 173
 174     TRACE("hdc: (%p), hglrc: (%p)\n", hdc, hglrc);
 175
 176     if (!dc) return FALSE;
 177
 178     if (!dc->funcs->pwglMakeCurrent) FIXME(" :stub\n");
 179     else ret = dc->funcs->pwglMakeCurrent(dc->physDev,hglrc);
 180
 181     DC_ReleaseDCPtr( dc );
 182     return ret;
 183 }
 184
 185 /***********************************************************************
 186  *              wglMakeContextCurrentARB
 187  */
 188 static BOOL WINAPI wglMakeContextCurrentARB(HDC hDrawDC, HDC hReadDC, HGLRC hglrc)
 189 {
 190     BOOL ret = FALSE;
 191     DC *DrawDC;
 192     DC *ReadDC;
 193
 194     TRACE("hDrawDC: (%p), hReadDC: (%p) hglrc: (%p)\n", hDrawDC, hReadDC, hglrc);
 195
 196     /* Both hDrawDC and hReadDC need to be valid */
 197     DrawDC = DC_GetDCPtr( hDrawDC);
 198     if (!DrawDC) return FALSE;
 199
 200     ReadDC = DC_GetDCPtr( hReadDC);
 201     if (!ReadDC) {
 202         DC_ReleaseDCPtr(DrawDC);
 203         return FALSE;
 204     }
 205
 206     if (!DrawDC->funcs->pwglMakeContextCurrentARB) FIXME(" :stub\n");
 207     else ret = DrawDC->funcs->pwglMakeContextCurrentARB(DrawDC->physDev, ReadDC->physDev, hglrc);
 208
 209     DC_ReleaseDCPtr(DrawDC);
 210     DC_ReleaseDCPtr(ReadDC);
 211
 212     return ret;
 213 }
 214
 215 /***********************************************************************
 216  *              wglShareLists (OPENGL32.@)
 217  */
 218 BOOL WINAPI wglShareLists(HGLRC hglrc1, HGLRC hglrc2)
 219 {
 220     DC *dc;
 221     BOOL ret = FALSE;
 222     OPENGL_Context ctx = (OPENGL_Context)hglrc1;
 223
 224     TRACE("hglrc1: (%p); hglrc: (%p)\n", hglrc1, hglrc2);
 225     if(ctx == NULL)
 226         return FALSE;
 227
 228     /* Retrieve the HDC associated with the context to access the display driver */
 229     dc = DC_GetDCPtr(ctx->hdc);
 230     if (!dc) return FALSE;
 231
 232     if (!dc->funcs->pwglShareLists) FIXME(" :stub\n");
 233     else ret = dc->funcs->pwglShareLists(hglrc1, hglrc2);
 234
 235     DC_ReleaseDCPtr( dc );
 236     return ret;
 237 }
 238
 239 /***********************************************************************
 240  *              wglUseFontBitmapsA (OPENGL32.@)
 241  */
 242 BOOL WINAPI wglUseFontBitmapsA(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 243 {
 244     BOOL ret = FALSE;
 245     DC * dc = DC_GetDCPtr( hdc );
 246
 247     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 248
 249     if (!dc) return FALSE;
 250
 251     if (!dc->funcs->pwglUseFontBitmapsA) FIXME(" :stub\n");
 252     else ret = dc->funcs->pwglUseFontBitmapsA(dc->physDev, first, count, listBase);
 253
 254     DC_ReleaseDCPtr( dc );
 255     return ret;
 256 }
 257
 258 /***********************************************************************
 259  *              wglUseFontBitmapsW (OPENGL32.@)
 260  */
 261 BOOL WINAPI wglUseFontBitmapsW(HDC hdc, DWORD first, DWORD count, DWORD listBase)
 262 {
 263     BOOL ret = FALSE;
 264     DC * dc = DC_GetDCPtr( hdc );
 265
 266     TRACE("(%p, %d, %d, %d)\n", hdc, first, count, listBase);
 267
 268     if (!dc) return FALSE;
 269
 270     if (!dc->funcs->pwglUseFontBitmapsW) FIXME(" :stub\n");
 271     else ret = dc->funcs->pwglUseFontBitmapsW(dc->physDev, first, count, listBase);
 272
 273     DC_ReleaseDCPtr( dc );
 274     return ret;
 275 }
 276
 277 /***********************************************************************
 278  *              Internal wglGetProcAddress for retrieving WGL extensions
 279  */
 280 PROC WINAPI wglGetProcAddress(LPCSTR func)
 281 {
 282     PROC ret = NULL;
 283     DC *dc;
 284
 285     if(!func)
 286         return NULL;
 287
 288     TRACE("func: '%s'\n", func);
 289
 290     /* Retrieve the global hDC to get access to the driver.  */
 291     dc = OPENGL_GetDefaultDC();
 292     if (!dc) return FALSE;
 293
 294     if (!dc->funcs->pwglGetProcAddress) FIXME(" :stub\n");
 295     else ret = dc->funcs->pwglGetProcAddress(func);
 296
 297     DC_ReleaseDCPtr( dc );
 298
 299     /* At the moment we implement one WGL extension which requires a HDC. When we
 300      * are looking up this call and when the Extension is available (that is the case
 301      * when a non-NULL value is returned by wglGetProcAddress), we return the address
 302      * of a wrapper function which will handle the HDC->PhysDev conversion.
 303      */
 304     if(ret && strcmp(func, "wglMakeContextCurrentARB") == 0)
 305         return (PROC)wglMakeContextCurrentARB;
 306     else if(ret && strcmp(func, "wglGetPbufferDCARB") == 0)
 307         return (PROC)wglGetPbufferDCARB;
 308
 309     return ret;
 310 }