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 "stw_icd.h"
  34 #include "stw_context.h"
  35 #include "stw_device.h"
  36 #include "stw_ext_context.h"
  37
  38
  39 wglCreateContext_t wglCreateContext_func = 0;
  40 wglDeleteContext_t wglDeleteContext_func = 0;
  41
  42
  43 /**
  44  * The implementation of this function is tricky.  The OPENGL32.DLL library
  45  * remaps the context IDs returned by our stw_create_context_attribs()
  46  * function to different values returned to the caller of wglCreateContext().
  47  * That is, DHGLRC (driver) handles are not equivalent to HGLRC (public)
  48  * handles.
  49  *
  50  * So we need to generate a new HGLRC ID here.  We do that by calling
  51  * the regular wglCreateContext() function.  Then, we replace the newly-
  52  * created stw_context with a new stw_context that reflects the arguments
  53  * to this function.
  54  */
  55 HGLRC WINAPI
  56 wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
  57 {
  58    HGLRC context;
  59
  60    int majorVersion = 1, minorVersion = 0, layerPlane = 0;
  61    int contextFlags = 0x0;
  62    int profileMask = WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
  63    int i;
  64    BOOL done = FALSE;
  65    const int contextFlagsAll = (WGL_CONTEXT_DEBUG_BIT_ARB |
  66                                 WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
  67
  68    /* parse attrib_list */
  69    if (attribList) {
  70       for (i = 0; !done && attribList[i]; i++) {
  71          switch (attribList[i]) {
  72          case WGL_CONTEXT_MAJOR_VERSION_ARB:
  73             majorVersion = attribList[++i];
  74             break;
  75          case WGL_CONTEXT_MINOR_VERSION_ARB:
  76             minorVersion = attribList[++i];
  77             break;
  78          case WGL_CONTEXT_LAYER_PLANE_ARB:
  79             layerPlane = attribList[++i];
  80             break;
  81          case WGL_CONTEXT_FLAGS_ARB:
  82             contextFlags = attribList[++i];
  83             break;
  84          case WGL_CONTEXT_PROFILE_MASK_ARB:
  85             profileMask = attribList[++i];
  86             break;
  87          case 0:
  88             /* end of list */
  89             done = TRUE;
  90             break;
  91          default:
  92             /* bad attribute */
  93             SetLastError(ERROR_INVALID_PARAMETER);
  94             return 0;
  95          }
  96       }
  97    }
  98
  99    /* check contextFlags */
 100    if (contextFlags & ~contextFlagsAll) {
 101       SetLastError(ERROR_INVALID_PARAMETER);
 102       return NULL;
 103    }
 104
 105    /* check profileMask */
 106    if (profileMask != WGL_CONTEXT_CORE_PROFILE_BIT_ARB &&
 107        profileMask != WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB &&
 108        profileMask != WGL_CONTEXT_ES_PROFILE_BIT_EXT) {
 109       SetLastError(ERROR_INVALID_PROFILE_ARB);
 110       return NULL;
 111    }
 112
 113    /* check version (generate ERROR_INVALID_VERSION_ARB if bad) */
 114    if (majorVersion <= 0 ||
 115        minorVersion < 0 ||
 116        (profileMask != WGL_CONTEXT_ES_PROFILE_BIT_EXT &&
 117         ((majorVersion == 1 && minorVersion > 5) ||
 118          (majorVersion == 2 && minorVersion > 1) ||
 119          (majorVersion == 3 && minorVersion > 3) ||
 120          (majorVersion == 4 && minorVersion > 5) ||
 121          majorVersion > 4)) ||
 122        (profileMask == WGL_CONTEXT_ES_PROFILE_BIT_EXT &&
 123         ((majorVersion == 1 && minorVersion > 1) ||
 124          (majorVersion == 2 && minorVersion > 0) ||
 125          (majorVersion == 3 && minorVersion > 1) ||
 126          majorVersion > 3))) {
 127       SetLastError(ERROR_INVALID_VERSION_ARB);
 128       return NULL;
 129    }
 130
 131    if ((contextFlags & WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) &&
 132        majorVersion < 3) {
 133       SetLastError(ERROR_INVALID_VERSION_ARB);
 134       return 0;
 135    }
 136
 137    /* Get pointer to OPENGL32.DLL's wglCreate/DeleteContext() functions */
 138    if (!wglCreateContext_func || !wglDeleteContext_func) {
 139       /* Get the OPENGL32.DLL library */
 140       HMODULE opengl_lib = GetModuleHandleA("opengl32.dll");
 141       if (!opengl_lib) {
 142          _debug_printf("wgl: GetModuleHandleA(\"opengl32.dll\") failed\n");
 143          return 0;
 144       }
 145
 146       /* Get pointer to wglCreateContext() function */
 147       wglCreateContext_func = (wglCreateContext_t)
 148          GetProcAddress(opengl_lib, "wglCreateContext");
 149       if (!wglCreateContext_func) {
 150          _debug_printf("wgl: failed to get wglCreateContext()\n");
 151          return 0;
 152       }
 153
 154       /* Get pointer to wglDeleteContext() function */
 155       wglDeleteContext_func = (wglDeleteContext_t)
 156          GetProcAddress(opengl_lib, "wglDeleteContext");
 157       if (!wglDeleteContext_func) {
 158          _debug_printf("wgl: failed to get wglDeleteContext()\n");
 159          return 0;
 160       }
 161    }
 162
 163    /* Call wglCreateContext to get a valid context ID */
 164    context = wglCreateContext_func(hDC);
 165
 166    if (context) {
 167       /* Now replace the context we just created with a new one that reflects
 168        * the attributes passed to this function.
 169        */
 170       DHGLRC dhglrc, c, share_dhglrc = 0;
 171
 172       /* Convert public HGLRC to driver DHGLRC */
 173       if (stw_dev && stw_dev->callbacks.wglCbGetDhglrc) {
 174          dhglrc = stw_dev->callbacks.wglCbGetDhglrc(context);
 175          if (hShareContext)
 176             share_dhglrc = stw_dev->callbacks.wglCbGetDhglrc(hShareContext);
 177       }
 178       else {
 179          /* not using ICD */
 180          dhglrc = (DHGLRC) context;
 181          share_dhglrc = (DHGLRC) hShareContext;
 182       }
 183
 184       c = stw_create_context_attribs(hDC, layerPlane, share_dhglrc,
 185                                      majorVersion, minorVersion,
 186                                      contextFlags, profileMask,
 187                                      dhglrc);
 188       if (!c) {
 189          wglDeleteContext_func(context);
 190          context = 0;
 191       }
 192    }
 193
 194    return context;
 195 }