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/*
* Mesa 3-D graphics library
*
* Copyright (C) 2011 Morgan Armand <morgan.devel@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <assert.h>
#include <windows.h>
#define WGL_WGLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/wglext.h>
#include "stw_icd.h"
#include "stw_context.h"
#include "stw_device.h"
/**
* The implementation of this function is tricky. The OPENGL32.DLL library
* remaps the context IDs returned by our stw_create_context_attribs()
* function to different values returned to the caller of wglCreateContext().
* That is, DHGLRC (driver) handles are not equivalent to HGLRC (public)
* handles.
*
* So we need to generate a new HGLRC ID here. We do that by calling
* the regular wglCreateContext() function. Then, we replace the newly-
* created stw_context with a new stw_context that reflects the arguments
* to this function.
*/
HGLRC WINAPI
wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
{
typedef HGLRC (*wglCreateContext_t)(HDC hdc);
typedef BOOL (*wglDeleteContext_t)(HGLRC hglrc);
HGLRC context;
static HMODULE opengl_lib = 0;
static wglCreateContext_t wglCreateContext_func = 0;
static wglDeleteContext_t wglDeleteContext_func = 0;
int majorVersion = 1, minorVersion = 0, layerPlane = 0;
int contextFlags = 0x0;
int profileMask = WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
int i;
BOOL done = FALSE;
/* parse attrib_list */
if (attribList) {
for (i = 0; !done && attribList[i]; i++) {
switch (attribList[i]) {
case WGL_CONTEXT_MAJOR_VERSION_ARB:
majorVersion = attribList[++i];
break;
case WGL_CONTEXT_MINOR_VERSION_ARB:
minorVersion = attribList[++i];
break;
case WGL_CONTEXT_LAYER_PLANE_ARB:
layerPlane = attribList[++i];
break;
case WGL_CONTEXT_FLAGS_ARB:
contextFlags = attribList[++i];
break;
case WGL_CONTEXT_PROFILE_MASK_ARB:
profileMask = attribList[++i];
break;
case 0:
/* end of list */
done = TRUE;
break;
default:
/* bad attribute */
SetLastError(ERROR_INVALID_PARAMETER);
return 0;
}
}
}
/* check version (generate ERROR_INVALID_VERSION_ARB if bad) */
switch (majorVersion) {
case 1:
if (minorVersion < 0 || minorVersion > 5) {
SetLastError(ERROR_INVALID_VERSION_ARB);
return 0;
}
break;
case 2:
if (minorVersion < 0 || minorVersion > 1) {
SetLastError(ERROR_INVALID_VERSION_ARB);
return 0;
}
break;
case 3:
if (minorVersion < 0 || minorVersion > 3) {
SetLastError(ERROR_INVALID_VERSION_ARB);
return 0;
}
break;
case 4:
if (minorVersion < 0 || minorVersion > 2) {
SetLastError(ERROR_INVALID_VERSION_ARB);
return 0;
}
break;
default:
return 0;
}
if ((contextFlags & WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) &&
majorVersion < 3) {
SetLastError(ERROR_INVALID_VERSION_ARB);
return 0;
}
/* check profileMask */
if (profileMask != WGL_CONTEXT_CORE_PROFILE_BIT_ARB &&
profileMask != WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB) {
SetLastError(ERROR_INVALID_PROFILE_ARB);
return 0;
}
/* Get pointer to OPENGL32.DLL's wglCreate/DeleteContext() functions */
if (opengl_lib == 0) {
/* Open the OPENGL32.DLL library */
opengl_lib = LoadLibraryA("OPENGL32.DLL");
if (!opengl_lib) {
fprintf(stderr, "wgl: LoadLibrary(OPENGL32.DLL) failed\n");
fflush(stderr);
return 0;
}
/* Get pointer to wglCreateContext() function */
wglCreateContext_func = (wglCreateContext_t)
GetProcAddress(opengl_lib, "wglCreateContext");
if (!wglCreateContext_func) {
fprintf(stderr, "wgl: failed to get wglCreateContext()\n");
fflush(stderr);
return 0;
}
/* Get pointer to wglDeleteContext() function */
wglDeleteContext_func = (wglDeleteContext_t)
GetProcAddress(opengl_lib, "wglDeleteContext");
if (!wglDeleteContext_func) {
fprintf(stderr, "wgl: failed to get wglDeleteContext()\n");
fflush(stderr);
return 0;
}
}
/* Call wglCreateContext to get a valid context ID */
context = wglCreateContext_func(hDC);
if (context) {
/* Now replace the context we just created with a new one that reflects
* the attributes passed to this function.
*/
DHGLRC dhglrc, c, share_dhglrc = 0;
/* Convert public HGLRC to driver DHGLRC */
if (stw_dev && stw_dev->callbacks.wglCbGetDhglrc) {
dhglrc = stw_dev->callbacks.wglCbGetDhglrc(context);
if (hShareContext)
share_dhglrc = stw_dev->callbacks.wglCbGetDhglrc(hShareContext);
}
else {
/* not using ICD */
dhglrc = (DHGLRC) context;
share_dhglrc = (DHGLRC) hShareContext;
}
c = stw_create_context_attribs(hDC, layerPlane, share_dhglrc,
majorVersion, minorVersion,
contextFlags, profileMask,
dhglrc);
if (!c) {
wglDeleteContext_func(context);
context = 0;
}
}
return context;
}
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