src/gallium/state_trackers/wgl/stw_ext_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2011 Morgan Armand <morgan.devel@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <windows.h>
  27
  28 #define WGL_WGLEXT_PROTOTYPES
  29
  30 #include <GL/gl.h>
  31 #include <GL/wglext.h>
  32
  33 #include "gldrv.h"
  34 #include "stw_context.h"
  35 #include "stw_device.h"
  36 #include "stw_ext_context.h"
  37
  38 #include "util/u_debug.h"
  39
  40
  41 wglCreateContext_t wglCreateContext_func = 0;
  42 wglDeleteContext_t wglDeleteContext_func = 0;
  43
  44
  45 /**
  46  * The implementation of this function is tricky.  The OPENGL32.DLL library
  47  * remaps the context IDs returned by our stw_create_context_attribs()
  48  * function to different values returned to the caller of wglCreateContext().
  49  * That is, DHGLRC (driver) handles are not equivalent to HGLRC (public)
  50  * handles.
  51  *
  52  * So we need to generate a new HGLRC ID here.  We do that by calling
  53  * the regular wglCreateContext() function.  Then, we replace the newly-
  54  * created stw_context with a new stw_context that reflects the arguments
  55  * to this function.
  56  */
  57 HGLRC WINAPI
  58 wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
  59 {
  60    HGLRC context;
  61
  62    int majorVersion = 1, minorVersion = 0, layerPlane = 0;
  63    int contextFlags = 0x0;
  64    int profileMask = WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
  65    int i;
  66    BOOL done = FALSE;
  67    const int contextFlagsAll = (WGL_CONTEXT_DEBUG_BIT_ARB |
  68                                 WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
  69
  70    /* parse attrib_list */
  71    if (attribList) {
  72       for (i = 0; !done && attribList[i]; i++) {
  73          switch (attribList[i]) {
  74          case WGL_CONTEXT_MAJOR_VERSION_ARB:
  75             majorVersion = attribList[++i];
  76             break;
  77          case WGL_CONTEXT_MINOR_VERSION_ARB:
  78             minorVersion = attribList[++i];
  79             break;
  80          case WGL_CONTEXT_LAYER_PLANE_ARB:
  81             layerPlane = attribList[++i];
  82             break;
  83          case WGL_CONTEXT_FLAGS_ARB:
  84             contextFlags = attribList[++i];
  85             break;
  86          case WGL_CONTEXT_PROFILE_MASK_ARB:
  87             profileMask = attribList[++i];
  88             break;
  89          case 0:
  90             /* end of list */
  91             done = TRUE;
  92             break;
  93          default:
  94             /* bad attribute */
  95             SetLastError(ERROR_INVALID_PARAMETER);
  96             return 0;
  97          }
  98       }
  99    }
 100
 101    /* check contextFlags */
 102    if (contextFlags & ~contextFlagsAll) {
 103       SetLastError(ERROR_INVALID_PARAMETER);
 104       return NULL;
 105    }
 106
 107    /* check profileMask */
 108    if (profileMask != WGL_CONTEXT_CORE_PROFILE_BIT_ARB &&
 109        profileMask != WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB &&
 110        profileMask != WGL_CONTEXT_ES_PROFILE_BIT_EXT) {
 111       SetLastError(ERROR_INVALID_PROFILE_ARB);
 112       return NULL;
 113    }
 114
 115    /* check version (generate ERROR_INVALID_VERSION_ARB if bad) */
 116    if (majorVersion <= 0 ||
 117        minorVersion < 0 ||
 118        (profileMask != WGL_CONTEXT_ES_PROFILE_BIT_EXT &&
 119         ((majorVersion == 1 && minorVersion > 5) ||
 120          (majorVersion == 2 && minorVersion > 1) ||
 121          (majorVersion == 3 && minorVersion > 3) ||
 122          (majorVersion == 4 && minorVersion > 5) ||
 123          majorVersion > 4)) ||
 124        (profileMask == WGL_CONTEXT_ES_PROFILE_BIT_EXT &&
 125         ((majorVersion == 1 && minorVersion > 1) ||
 126          (majorVersion == 2 && minorVersion > 0) ||
 127          (majorVersion == 3 && minorVersion > 1) ||
 128          majorVersion > 3))) {
 129       SetLastError(ERROR_INVALID_VERSION_ARB);
 130       return NULL;
 131    }
 132
 133    if ((contextFlags & WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) &&
 134        majorVersion < 3) {
 135       SetLastError(ERROR_INVALID_VERSION_ARB);
 136       return 0;
 137    }
 138
 139    /* Get pointer to OPENGL32.DLL's wglCreate/DeleteContext() functions */
 140    if (!wglCreateContext_func || !wglDeleteContext_func) {
 141       /* Get the OPENGL32.DLL library */
 142       HMODULE opengl_lib = GetModuleHandleA("opengl32.dll");
 143       if (!opengl_lib) {
 144          _debug_printf("wgl: GetModuleHandleA(\"opengl32.dll\") failed\n");
 145          return 0;
 146       }
 147
 148       /* Get pointer to wglCreateContext() function */
 149       wglCreateContext_func = (wglCreateContext_t)
 150          GetProcAddress(opengl_lib, "wglCreateContext");
 151       if (!wglCreateContext_func) {
 152          _debug_printf("wgl: failed to get wglCreateContext()\n");
 153          return 0;
 154       }
 155
 156       /* Get pointer to wglDeleteContext() function */
 157       wglDeleteContext_func = (wglDeleteContext_t)
 158          GetProcAddress(opengl_lib, "wglDeleteContext");
 159       if (!wglDeleteContext_func) {
 160          _debug_printf("wgl: failed to get wglDeleteContext()\n");
 161          return 0;
 162       }
 163    }
 164
 165    /* Call wglCreateContext to get a valid context ID */
 166    context = wglCreateContext_func(hDC);
 167
 168    if (context) {
 169       /* Now replace the context we just created with a new one that reflects
 170        * the attributes passed to this function.
 171        */
 172       DHGLRC dhglrc, c, share_dhglrc = 0;
 173
 174       /* Convert public HGLRC to driver DHGLRC */
 175       if (stw_dev && stw_dev->callbacks.pfnGetDhglrc) {
 176          dhglrc = stw_dev->callbacks.pfnGetDhglrc(context);
 177          if (hShareContext)
 178             share_dhglrc = stw_dev->callbacks.pfnGetDhglrc(hShareContext);
 179       }
 180       else {
 181          /* not using ICD */
 182          dhglrc = (DHGLRC)(INT_PTR)context;
 183          share_dhglrc = (DHGLRC)(INT_PTR)hShareContext;
 184       }
 185
 186       c = stw_create_context_attribs(hDC, layerPlane, share_dhglrc,
 187                                      majorVersion, minorVersion,
 188                                      contextFlags, profileMask,
 189                                      dhglrc);
 190       if (!c) {
 191          wglDeleteContext_func(context);
 192          context = 0;
 193       }
 194    }
 195
 196    return context;
 197 }
 198
 199
 200 /** Defined by WGL_ARB_make_current_read */
 201 BOOL APIENTRY
 202 wglMakeContextCurrentARB(HDC hDrawDC, HDC hReadDC, HGLRC hglrc)
 203 {
 204    DHGLRC dhglrc = 0;
 205
 206    if (stw_dev && stw_dev->callbacks.pfnGetDhglrc) {
 207       /* Convert HGLRC to DHGLRC */
 208       dhglrc = stw_dev->callbacks.pfnGetDhglrc(hglrc);
 209    }
 210
 211    return stw_make_current(hDrawDC, hReadDC, dhglrc);
 212 }