src/video/windows/SDL_windowsopengl.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 01 Aug 2012 20:29:36 -0400
changeset 6382 64d54101773a
parent 6380 3990b7d564d7
child 6383 869effc44c41
permissions -rwxr-xr-x
Add support for (GLX|WGL)_EXT_swap_control_tear.

This required a small public API change: SDL_GL_SetSwapInterval() now accepts
negative values, and SDL_GL_GetSwapInterval() doesn't report errors anymore
(if it can't work, it'll return zero as a reasonable default).

If you need to test for errors, such as a lack of swap_control_tear support,
check the results of SDL_GL_SetSwapInterval() when you set your desired
value.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_WINDOWS
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#include "SDL_windowsvideo.h"
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/* WGL implementation of SDL OpenGL support */
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#if SDL_VIDEO_OPENGL_WGL
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#include "SDL_opengl.h"
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#define DEFAULT_OPENGL "OPENGL32.DLL"
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#ifndef WGL_ARB_create_context
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#define WGL_ARB_create_context
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#define WGL_CONTEXT_MAJOR_VERSION_ARB   0x2091
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#define WGL_CONTEXT_MINOR_VERSION_ARB   0x2092
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#define WGL_CONTEXT_LAYER_PLANE_ARB     0x2093
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#define WGL_CONTEXT_FLAGS_ARB           0x2094
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#define WGL_CONTEXT_DEBUG_BIT_ARB       0x0001
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#define WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB  0x0002
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#ifndef WGL_ARB_create_context_profile
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#define WGL_ARB_create_context_profile
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#define WGL_CONTEXT_PROFILE_MASK_ARB              0x9126
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#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB          0x00000001
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#define WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
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#endif
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#ifndef WGL_ARB_create_context_robustness
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#define WGL_ARB_create_context_robustness
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#define WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB         0x00000004
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#define WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB     0x8256
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#define WGL_NO_RESET_NOTIFICATION_ARB                   0x8261
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#define WGL_LOSE_CONTEXT_ON_RESET_ARB                   0x8252
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#endif
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#endif
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#ifndef WGL_EXT_create_context_es2_profile
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#define WGL_EXT_create_context_es2_profile
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#define WGL_CONTEXT_ES2_PROFILE_BIT_EXT           0x00000004
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#endif
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typedef HGLRC(APIENTRYP PFNWGLCREATECONTEXTATTRIBSARBPROC) (HDC hDC,
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                                                            HGLRC
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                                                            hShareContext,
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                                                            const int
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                                                            *attribList);
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int
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WIN_GL_LoadLibrary(_THIS, const char *path)
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{
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    LPTSTR wpath;
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    HANDLE handle;
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    if (path == NULL) {
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        path = SDL_getenv("SDL_OPENGL_LIBRARY");
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    }
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    if (path == NULL) {
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        path = DEFAULT_OPENGL;
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    }
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    wpath = WIN_UTF8ToString(path);
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    _this->gl_config.dll_handle = LoadLibrary(wpath);
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    SDL_free(wpath);
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    if (!_this->gl_config.dll_handle) {
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        char message[1024];
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        SDL_snprintf(message, SDL_arraysize(message), "LoadLibrary(\"%s\")",
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                     path);
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        WIN_SetError(message);
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        return -1;
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    }
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    SDL_strlcpy(_this->gl_config.driver_path, path,
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                SDL_arraysize(_this->gl_config.driver_path));
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    /* Allocate OpenGL memory */
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    _this->gl_data =
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        (struct SDL_GLDriverData *) SDL_calloc(1,
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                                               sizeof(struct
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                                                      SDL_GLDriverData));
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    if (!_this->gl_data) {
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        SDL_OutOfMemory();
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        return -1;
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    }
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    /* Load function pointers */
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    handle = _this->gl_config.dll_handle;
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    _this->gl_data->wglGetProcAddress = (void *(WINAPI *) (const char *))
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        GetProcAddress(handle, "wglGetProcAddress");
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    _this->gl_data->wglCreateContext = (HGLRC(WINAPI *) (HDC))
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        GetProcAddress(handle, "wglCreateContext");
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    _this->gl_data->wglDeleteContext = (BOOL(WINAPI *) (HGLRC))
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        GetProcAddress(handle, "wglDeleteContext");
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    _this->gl_data->wglMakeCurrent = (BOOL(WINAPI *) (HDC, HGLRC))
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        GetProcAddress(handle, "wglMakeCurrent");
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    if (!_this->gl_data->wglGetProcAddress ||
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        !_this->gl_data->wglCreateContext ||
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        !_this->gl_data->wglDeleteContext ||
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        !_this->gl_data->wglMakeCurrent) {
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        SDL_SetError("Could not retrieve OpenGL functions");
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        SDL_UnloadObject(handle);
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        return -1;
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    }
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    return 0;
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}
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void *
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WIN_GL_GetProcAddress(_THIS, const char *proc)
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{
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    void *func;
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    /* This is to pick up extensions */
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    func = _this->gl_data->wglGetProcAddress(proc);
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    if (!func) {
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        /* This is probably a normal GL function */
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        func = GetProcAddress(_this->gl_config.dll_handle, proc);
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    }
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    return func;
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}
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void
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WIN_GL_UnloadLibrary(_THIS)
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{
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    FreeLibrary((HMODULE) _this->gl_config.dll_handle);
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    _this->gl_config.dll_handle = NULL;
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    /* Free OpenGL memory */
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    SDL_free(_this->gl_data);
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    _this->gl_data = NULL;
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}
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static void
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WIN_GL_SetupPixelFormat(_THIS, PIXELFORMATDESCRIPTOR * pfd)
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{
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    SDL_zerop(pfd);
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    pfd->nSize = sizeof(*pfd);
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    pfd->nVersion = 1;
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    pfd->dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL);
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    if (_this->gl_config.double_buffer) {
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        pfd->dwFlags |= PFD_DOUBLEBUFFER;
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    }
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    if (_this->gl_config.stereo) {
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        pfd->dwFlags |= PFD_STEREO;
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    }
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    pfd->iLayerType = PFD_MAIN_PLANE;
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    pfd->iPixelType = PFD_TYPE_RGBA;
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    pfd->cRedBits = _this->gl_config.red_size;
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    pfd->cGreenBits = _this->gl_config.green_size;
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    pfd->cBlueBits = _this->gl_config.blue_size;
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    pfd->cAlphaBits = _this->gl_config.alpha_size;
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    if (_this->gl_config.buffer_size) {
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        pfd->cColorBits =
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            _this->gl_config.buffer_size - _this->gl_config.alpha_size;
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    } else {
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        pfd->cColorBits = (pfd->cRedBits + pfd->cGreenBits + pfd->cBlueBits);
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    }
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    pfd->cAccumRedBits = _this->gl_config.accum_red_size;
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    pfd->cAccumGreenBits = _this->gl_config.accum_green_size;
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    pfd->cAccumBlueBits = _this->gl_config.accum_blue_size;
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    pfd->cAccumAlphaBits = _this->gl_config.accum_alpha_size;
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    pfd->cAccumBits =
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        (pfd->cAccumRedBits + pfd->cAccumGreenBits + pfd->cAccumBlueBits +
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         pfd->cAccumAlphaBits);
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    pfd->cDepthBits = _this->gl_config.depth_size;
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    pfd->cStencilBits = _this->gl_config.stencil_size;
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}
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/* Choose the closest pixel format that meets or exceeds the target.
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   FIXME: Should we weight any particular attribute over any other?
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*/
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static int
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WIN_GL_ChoosePixelFormat(HDC hdc, PIXELFORMATDESCRIPTOR * target)
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{
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    PIXELFORMATDESCRIPTOR pfd;
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    int count, index, best = 0;
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    unsigned int dist, best_dist = ~0U;
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    count = DescribePixelFormat(hdc, 1, sizeof(pfd), NULL);
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    for (index = 1; index <= count; index++) {
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        if (!DescribePixelFormat(hdc, index, sizeof(pfd), &pfd)) {
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            continue;
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        }
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        if ((pfd.dwFlags & target->dwFlags) != target->dwFlags) {
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            continue;
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        }
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        if (pfd.iLayerType != target->iLayerType) {
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            continue;
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        }
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        if (pfd.iPixelType != target->iPixelType) {
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            continue;
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        }
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        dist = 0;
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        if (pfd.cColorBits < target->cColorBits) {
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            continue;
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        } else {
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            dist += (pfd.cColorBits - target->cColorBits);
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        }
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        if (pfd.cRedBits < target->cRedBits) {
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            continue;
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        } else {
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            dist += (pfd.cRedBits - target->cRedBits);
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        }
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        if (pfd.cGreenBits < target->cGreenBits) {
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            continue;
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        } else {
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            dist += (pfd.cGreenBits - target->cGreenBits);
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        }
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        if (pfd.cBlueBits < target->cBlueBits) {
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            continue;
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        } else {
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            dist += (pfd.cBlueBits - target->cBlueBits);
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        }
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        if (pfd.cAlphaBits < target->cAlphaBits) {
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            continue;
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        } else {
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            dist += (pfd.cAlphaBits - target->cAlphaBits);
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        }
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        if (pfd.cAccumBits < target->cAccumBits) {
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            continue;
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        } else {
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            dist += (pfd.cAccumBits - target->cAccumBits);
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        }
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        if (pfd.cAccumRedBits < target->cAccumRedBits) {
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            continue;
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        } else {
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            dist += (pfd.cAccumRedBits - target->cAccumRedBits);
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        }
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        if (pfd.cAccumGreenBits < target->cAccumGreenBits) {
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            continue;
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        } else {
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            dist += (pfd.cAccumGreenBits - target->cAccumGreenBits);
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        }
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        if (pfd.cAccumBlueBits < target->cAccumBlueBits) {
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            continue;
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        } else {
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            dist += (pfd.cAccumBlueBits - target->cAccumBlueBits);
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        }
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        if (pfd.cAccumAlphaBits < target->cAccumAlphaBits) {
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            continue;
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        } else {
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            dist += (pfd.cAccumAlphaBits - target->cAccumAlphaBits);
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        }
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        if (pfd.cDepthBits < target->cDepthBits) {
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            continue;
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        } else {
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            dist += (pfd.cDepthBits - target->cDepthBits);
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        }
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        if (pfd.cStencilBits < target->cStencilBits) {
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            continue;
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        } else {
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            dist += (pfd.cStencilBits - target->cStencilBits);
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        }
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        if (dist < best_dist) {
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            best = index;
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            best_dist = dist;
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        }
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    }
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    return best;
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}
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static SDL_bool
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HasExtension(const char *extension, const char *extensions)
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   292
{
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   293
    const char *start;
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   294
    const char *where, *terminator;
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   295
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    /* Extension names should not have spaces. */
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    where = SDL_strchr(extension, ' ');
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    if (where || *extension == '\0')
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        return SDL_FALSE;
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   300
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   301
    if (!extensions)
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        return SDL_FALSE;
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   303
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    /* It takes a bit of care to be fool-proof about parsing the
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     * OpenGL extensions string. Don't be fooled by sub-strings,
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     * etc. */
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   307
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   308
    start = extensions;
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   309
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    for (;;) {
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        where = SDL_strstr(start, extension);
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        if (!where)
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            break;
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   314
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   315
        terminator = where + SDL_strlen(extension);
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        if (where == start || *(where - 1) == ' ')
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   317
            if (*terminator == ' ' || *terminator == '\0')
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                return SDL_TRUE;
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   319
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   320
        start = terminator;
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   321
    }
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    return SDL_FALSE;
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   323
}
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   324
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   325
static void
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   326
WIN_GL_InitExtensions(_THIS, HDC hdc)
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   327
{
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   328
    const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0;
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   329
    const char *extensions;
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   330
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   331
    wglGetExtensionsStringARB = (const char *(WINAPI *) (HDC))
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   332
        _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB");
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   333
    if (wglGetExtensionsStringARB) {
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   334
        extensions = wglGetExtensionsStringARB(hdc);
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   335
    } else {
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   336
        extensions = NULL;
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   337
    }
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   338
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   339
    /* Check for WGL_ARB_pixel_format */
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    _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_FALSE;
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   341
    if (HasExtension("WGL_ARB_pixel_format", extensions)) {
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   342
        _this->gl_data->wglChoosePixelFormatARB = (BOOL(WINAPI *)
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                                                   (HDC, const int *,
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                                                    const FLOAT *, UINT,
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   345
                                                    int *, UINT *))
slouken@1913
   346
            WIN_GL_GetProcAddress(_this, "wglChoosePixelFormatARB");
slouken@1913
   347
        _this->gl_data->wglGetPixelFormatAttribivARB =
slouken@1913
   348
            (BOOL(WINAPI *) (HDC, int, int, UINT, const int *, int *))
slouken@1913
   349
            WIN_GL_GetProcAddress(_this, "wglGetPixelFormatAttribivARB");
slouken@1913
   350
slouken@1913
   351
        if ((_this->gl_data->wglChoosePixelFormatARB != NULL) &&
slouken@1913
   352
            (_this->gl_data->wglGetPixelFormatAttribivARB != NULL)) {
icculus@6382
   353
            _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_TRUE;
slouken@1913
   354
        }
slouken@1913
   355
    }
slouken@1913
   356
slouken@1913
   357
    /* Check for WGL_EXT_swap_control */
icculus@6382
   358
    _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_FALSE;
slouken@1913
   359
    if (HasExtension("WGL_EXT_swap_control", extensions)) {
slouken@1913
   360
        _this->gl_data->wglSwapIntervalEXT =
slouken@1913
   361
            WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
slouken@1913
   362
        _this->gl_data->wglGetSwapIntervalEXT =
slouken@1913
   363
            WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
icculus@6382
   364
        if (HasExtension("WGL_EXT_swap_control_tear", extensions)) {
icculus@6382
   365
            _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_TRUE;
icculus@6382
   366
        }
slouken@2178
   367
    } else {
slouken@2178
   368
        _this->gl_data->wglSwapIntervalEXT = NULL;
slouken@2178
   369
        _this->gl_data->wglGetSwapIntervalEXT = NULL;
slouken@1913
   370
    }
slouken@2178
   371
}
slouken@1913
   372
slouken@2178
   373
static int
slouken@2178
   374
WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
slouken@2178
   375
{
slouken@2178
   376
    HWND hwnd;
slouken@2178
   377
    HDC hdc;
slouken@2180
   378
    PIXELFORMATDESCRIPTOR pfd;
slouken@2178
   379
    HGLRC hglrc;
slouken@2178
   380
    int pixel_format = 0;
slouken@2178
   381
    unsigned int matching;
slouken@2178
   382
slouken@2178
   383
    hwnd =
slouken@2178
   384
        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
slouken@2178
   385
                     10, 10, NULL, NULL, SDL_Instance, NULL);
slouken@2178
   386
    WIN_PumpEvents(_this);
slouken@2178
   387
slouken@2178
   388
    hdc = GetDC(hwnd);
slouken@2178
   389
slouken@2180
   390
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@2180
   391
slouken@2180
   392
    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
slouken@2180
   393
slouken@2178
   394
    hglrc = _this->gl_data->wglCreateContext(hdc);
slouken@1913
   395
    if (hglrc) {
slouken@2178
   396
        _this->gl_data->wglMakeCurrent(hdc, hglrc);
slouken@2178
   397
slouken@2178
   398
        WIN_GL_InitExtensions(_this, hdc);
slouken@2178
   399
icculus@6382
   400
        if (_this->gl_data->HAS_WGL_ARB_pixel_format) {
slouken@2178
   401
            _this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
slouken@2178
   402
                                                    1, &pixel_format,
slouken@2178
   403
                                                    &matching);
slouken@2178
   404
        }
slouken@2178
   405
slouken@1913
   406
        _this->gl_data->wglMakeCurrent(NULL, NULL);
slouken@1913
   407
        _this->gl_data->wglDeleteContext(hglrc);
slouken@1913
   408
    }
slouken@1913
   409
    ReleaseDC(hwnd, hdc);
slouken@1913
   410
    DestroyWindow(hwnd);
slouken@1913
   411
    WIN_PumpEvents(_this);
slouken@2178
   412
slouken@2178
   413
    return pixel_format;
slouken@1913
   414
}
slouken@1913
   415
slouken@1913
   416
int
slouken@1913
   417
WIN_GL_SetupWindow(_THIS, SDL_Window * window)
slouken@1913
   418
{
slouken@1913
   419
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   420
    PIXELFORMATDESCRIPTOR pfd;
slouken@6296
   421
    int pixel_format = 0;
slouken@1913
   422
    int iAttribs[64];
slouken@1913
   423
    int *iAttr;
slouken@1913
   424
    float fAttribs[1] = { 0 };
slouken@1913
   425
slouken@1913
   426
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@1913
   427
slouken@1913
   428
    /* setup WGL_ARB_pixel_format attribs */
slouken@1913
   429
    iAttr = &iAttribs[0];
slouken@1913
   430
slouken@1913
   431
    *iAttr++ = WGL_DRAW_TO_WINDOW_ARB;
slouken@1913
   432
    *iAttr++ = GL_TRUE;
slouken@1913
   433
    *iAttr++ = WGL_RED_BITS_ARB;
slouken@1913
   434
    *iAttr++ = _this->gl_config.red_size;
slouken@1913
   435
    *iAttr++ = WGL_GREEN_BITS_ARB;
slouken@1913
   436
    *iAttr++ = _this->gl_config.green_size;
slouken@1913
   437
    *iAttr++ = WGL_BLUE_BITS_ARB;
slouken@1913
   438
    *iAttr++ = _this->gl_config.blue_size;
slouken@1913
   439
slouken@1913
   440
    if (_this->gl_config.alpha_size) {
slouken@1913
   441
        *iAttr++ = WGL_ALPHA_BITS_ARB;
slouken@1913
   442
        *iAttr++ = _this->gl_config.alpha_size;
slouken@1913
   443
    }
slouken@1913
   444
slouken@1913
   445
    *iAttr++ = WGL_DOUBLE_BUFFER_ARB;
slouken@1913
   446
    *iAttr++ = _this->gl_config.double_buffer;
slouken@1913
   447
slouken@1913
   448
    *iAttr++ = WGL_DEPTH_BITS_ARB;
slouken@1913
   449
    *iAttr++ = _this->gl_config.depth_size;
slouken@1913
   450
slouken@1913
   451
    if (_this->gl_config.stencil_size) {
slouken@1913
   452
        *iAttr++ = WGL_STENCIL_BITS_ARB;
slouken@1913
   453
        *iAttr++ = _this->gl_config.stencil_size;
slouken@1913
   454
    }
slouken@1913
   455
slouken@1913
   456
    if (_this->gl_config.accum_red_size) {
slouken@1913
   457
        *iAttr++ = WGL_ACCUM_RED_BITS_ARB;
slouken@1913
   458
        *iAttr++ = _this->gl_config.accum_red_size;
slouken@1913
   459
    }
slouken@1913
   460
slouken@1913
   461
    if (_this->gl_config.accum_green_size) {
slouken@1913
   462
        *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB;
slouken@1913
   463
        *iAttr++ = _this->gl_config.accum_green_size;
slouken@1913
   464
    }
slouken@1913
   465
slouken@1913
   466
    if (_this->gl_config.accum_blue_size) {
slouken@1913
   467
        *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB;
slouken@1913
   468
        *iAttr++ = _this->gl_config.accum_blue_size;
slouken@1913
   469
    }
slouken@1913
   470
slouken@1913
   471
    if (_this->gl_config.accum_alpha_size) {
slouken@1913
   472
        *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB;
slouken@1913
   473
        *iAttr++ = _this->gl_config.accum_alpha_size;
slouken@1913
   474
    }
slouken@1913
   475
slouken@1913
   476
    if (_this->gl_config.stereo) {
slouken@1913
   477
        *iAttr++ = WGL_STEREO_ARB;
slouken@1913
   478
        *iAttr++ = GL_TRUE;
slouken@1913
   479
    }
slouken@1913
   480
slouken@1913
   481
    if (_this->gl_config.multisamplebuffers) {
slouken@1913
   482
        *iAttr++ = WGL_SAMPLE_BUFFERS_ARB;
slouken@1913
   483
        *iAttr++ = _this->gl_config.multisamplebuffers;
slouken@1913
   484
    }
slouken@1913
   485
slouken@1913
   486
    if (_this->gl_config.multisamplesamples) {
slouken@1913
   487
        *iAttr++ = WGL_SAMPLES_ARB;
slouken@1913
   488
        *iAttr++ = _this->gl_config.multisamplesamples;
slouken@1913
   489
    }
slouken@1913
   490
slouken@6296
   491
    *iAttr++ = WGL_ACCELERATION_ARB;
slouken@6296
   492
    *iAttr++ = WGL_FULL_ACCELERATION_ARB;
slouken@1913
   493
slouken@1913
   494
    *iAttr = 0;
slouken@1913
   495
slouken@1913
   496
    /* Choose and set the closest available pixel format */
slouken@6296
   497
    if (_this->gl_config.accelerated != 0) {
slouken@6296
   498
        pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
slouken@6296
   499
    }
slouken@6296
   500
    if (!pixel_format && _this->gl_config.accelerated != 1) {
slouken@6296
   501
        iAttr[-1] = WGL_NO_ACCELERATION_ARB;
slouken@6296
   502
	pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
slouken@6296
   503
    }
slouken@2178
   504
    if (!pixel_format) {
slouken@2150
   505
        pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd);
slouken@1913
   506
    }
slouken@1913
   507
    if (!pixel_format) {
slouken@1913
   508
        SDL_SetError("No matching GL pixel format available");
slouken@1913
   509
        return -1;
slouken@1913
   510
    }
slouken@1913
   511
    if (!SetPixelFormat(hdc, pixel_format, &pfd)) {
slouken@1913
   512
        WIN_SetError("SetPixelFormat()");
slouken@1913
   513
        return (-1);
slouken@1913
   514
    }
slouken@1913
   515
    return 0;
slouken@1913
   516
}
slouken@1913
   517
slouken@1913
   518
SDL_GLContext
slouken@1913
   519
WIN_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1913
   520
{
slouken@1913
   521
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@2178
   522
    HGLRC context;
slouken@1913
   523
slouken@3100
   524
    if (_this->gl_config.major_version < 3) {
slouken@3100
   525
        context = _this->gl_data->wglCreateContext(hdc);
slouken@3100
   526
    } else {
slouken@3100
   527
        PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
slouken@3100
   528
        HGLRC temp_context = _this->gl_data->wglCreateContext(hdc);
slouken@3100
   529
        if (!temp_context) {
slouken@3139
   530
            SDL_SetError("Could not create GL context");
slouken@3100
   531
            return NULL;
slouken@3100
   532
        }
slouken@3139
   533
slouken@3100
   534
        /* Make the context current */
slouken@3100
   535
        if (WIN_GL_MakeCurrent(_this, window, temp_context) < 0) {
slouken@3100
   536
            WIN_GL_DeleteContext(_this, temp_context);
slouken@3100
   537
            return NULL;
slouken@3100
   538
        }
slouken@3139
   539
slouken@3139
   540
        wglCreateContextAttribsARB =
slouken@3139
   541
            (PFNWGLCREATECONTEXTATTRIBSARBPROC) _this->gl_data->
slouken@3139
   542
            wglGetProcAddress("wglCreateContextAttribsARB");
slouken@3100
   543
        if (!wglCreateContextAttribsARB) {
slouken@3100
   544
            SDL_SetError("GL 3.x is not supported");
slouken@3100
   545
            context = temp_context;
slouken@3100
   546
        } else {
slouken@6296
   547
	    /* max 8 attributes plus terminator */
slouken@6296
   548
            int attribs[9] = {
slouken@3100
   549
                WGL_CONTEXT_MAJOR_VERSION_ARB, _this->gl_config.major_version,
slouken@3100
   550
                WGL_CONTEXT_MINOR_VERSION_ARB, _this->gl_config.minor_version,
slouken@3139
   551
                0
slouken@3100
   552
            };
slouken@6296
   553
	    int iattr = 4;
slouken@6296
   554
slouken@6296
   555
	    /* SDL profile bits match WGL profile bits */
slouken@6296
   556
	    if( _this->gl_config.profile_mask != 0 ) {
slouken@6296
   557
	        attribs[iattr++] = WGL_CONTEXT_PROFILE_MASK_ARB;
slouken@6296
   558
		attribs[iattr++] = _this->gl_config.profile_mask;
slouken@6296
   559
	    }
slouken@6296
   560
slouken@6296
   561
	    /* SDL flags match WGL flags */
slouken@6296
   562
	    if( _this->gl_config.flags != 0 ) {
slouken@6296
   563
	        attribs[iattr++] = WGL_CONTEXT_FLAGS_ARB;
slouken@6296
   564
		attribs[iattr++] = _this->gl_config.flags;
slouken@6296
   565
	    }
slouken@6296
   566
slouken@6296
   567
	    attribs[iattr++] = 0;
slouken@6296
   568
slouken@3100
   569
            /* Create the GL 3.x context */
slouken@3100
   570
            context = wglCreateContextAttribsARB(hdc, 0, attribs);
slouken@3100
   571
            /* Delete the GL 2.x context */
slouken@3105
   572
            _this->gl_data->wglDeleteContext(temp_context);
slouken@3100
   573
        }
slouken@3100
   574
    }
slouken@3139
   575
slouken@2178
   576
    if (!context) {
slouken@3565
   577
        WIN_SetError("Could not create GL context");
slouken@2178
   578
        return NULL;
slouken@2178
   579
    }
slouken@2178
   580
slouken@2178
   581
    if (WIN_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   582
        WIN_GL_DeleteContext(_this, context);
slouken@2178
   583
        return NULL;
slouken@2178
   584
    }
slouken@2178
   585
slouken@2178
   586
    WIN_GL_InitExtensions(_this, hdc);
slouken@2178
   587
slouken@2178
   588
    return context;
slouken@1913
   589
}
slouken@1913
   590
slouken@1913
   591
int
slouken@1913
   592
WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1913
   593
{
slouken@1913
   594
    HDC hdc;
slouken@1913
   595
    int status;
slouken@1913
   596
slouken@1913
   597
    if (window) {
slouken@1913
   598
        hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   599
    } else {
slouken@1913
   600
        hdc = NULL;
slouken@1913
   601
    }
slouken@1913
   602
    if (!_this->gl_data->wglMakeCurrent(hdc, (HGLRC) context)) {
slouken@1913
   603
        WIN_SetError("wglMakeCurrent()");
slouken@1913
   604
        status = -1;
slouken@1913
   605
    } else {
slouken@1913
   606
        status = 0;
slouken@1913
   607
    }
slouken@1913
   608
    return status;
slouken@1913
   609
}
slouken@1913
   610
slouken@1913
   611
int
slouken@1913
   612
WIN_GL_SetSwapInterval(_THIS, int interval)
slouken@1913
   613
{
icculus@6382
   614
    if ((interval < 0) && (!_this->gl_data->HAS_WGL_EXT_swap_control_tear)) {
icculus@6382
   615
        SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   616
    } else if (_this->gl_data->wglSwapIntervalEXT) {
slouken@1913
   617
        _this->gl_data->wglSwapIntervalEXT(interval);
slouken@1913
   618
        return 0;
slouken@1913
   619
    } else {
slouken@1913
   620
        SDL_Unsupported();
slouken@1913
   621
        return -1;
slouken@1913
   622
    }
slouken@1913
   623
}
slouken@1913
   624
slouken@1913
   625
int
slouken@1913
   626
WIN_GL_GetSwapInterval(_THIS)
slouken@1913
   627
{
slouken@1913
   628
    if (_this->gl_data->wglGetSwapIntervalEXT) {
slouken@1913
   629
        return _this->gl_data->wglGetSwapIntervalEXT();
slouken@1913
   630
    } else {
icculus@6382
   631
        /*SDL_Unsupported();*/
icculus@6382
   632
        return 0;  /* just say we're unsync'd. */
slouken@1913
   633
    }
slouken@1913
   634
}
slouken@1913
   635
slouken@1913
   636
void
slouken@1913
   637
WIN_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1913
   638
{
slouken@1913
   639
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   640
slouken@1913
   641
    SwapBuffers(hdc);
slouken@1913
   642
}
slouken@1913
   643
slouken@1913
   644
void
slouken@1913
   645
WIN_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1913
   646
{
slouken@1936
   647
    _this->gl_data->wglDeleteContext((HGLRC) context);
slouken@1913
   648
}
slouken@1913
   649
slouken@1952
   650
#endif /* SDL_VIDEO_OPENGL_WGL */
slouken@1913
   651
slouken@6044
   652
#endif /* SDL_VIDEO_DRIVER_WINDOWS */
slouken@6044
   653
slouken@1913
   654
/* vi: set ts=4 sw=4 expandtab: */