src/video/windows/SDL_windowsopengl.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 15 Feb 2013 08:47:44 -0800
changeset 6885 700f1b25f77f
parent 6522 edacce9402fb
child 7037 3fedf1f25b94
permissions -rw-r--r--
Happy New Year!
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 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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#ifndef WGL_EXT_create_context_es_profile
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#define WGL_EXT_create_context_es_profile
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#define WGL_CONTEXT_ES_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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    _this->gl_data->wglShareLists = (BOOL(WINAPI *) (HGLRC, HGLRC))
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        GetProcAddress(handle, "wglShareLists");
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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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{
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    const char *start;
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    const char *where, *terminator;
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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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    if (!extensions)
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        return SDL_FALSE;
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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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    start = extensions;
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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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        terminator = where + SDL_strlen(extension);
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        if (where == start || *(where - 1) == ' ')
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            if (*terminator == ' ' || *terminator == '\0')
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                return SDL_TRUE;
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        start = terminator;
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    }
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    return SDL_FALSE;
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}
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static void
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WIN_GL_InitExtensions(_THIS, HDC hdc)
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{
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    const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0;
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    const char *extensions;
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    wglGetExtensionsStringARB = (const char *(WINAPI *) (HDC))
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        _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB");
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    if (wglGetExtensionsStringARB) {
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        extensions = wglGetExtensionsStringARB(hdc);
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    } else {
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        extensions = NULL;
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    }
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    /* Check for WGL_ARB_pixel_format */
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    _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_FALSE;
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    if (HasExtension("WGL_ARB_pixel_format", extensions)) {
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   349
        _this->gl_data->wglChoosePixelFormatARB = (BOOL(WINAPI *)
slouken@1913
   350
                                                   (HDC, const int *,
slouken@1913
   351
                                                    const FLOAT *, UINT,
slouken@1913
   352
                                                    int *, UINT *))
slouken@1913
   353
            WIN_GL_GetProcAddress(_this, "wglChoosePixelFormatARB");
slouken@1913
   354
        _this->gl_data->wglGetPixelFormatAttribivARB =
slouken@1913
   355
            (BOOL(WINAPI *) (HDC, int, int, UINT, const int *, int *))
slouken@1913
   356
            WIN_GL_GetProcAddress(_this, "wglGetPixelFormatAttribivARB");
slouken@1913
   357
slouken@1913
   358
        if ((_this->gl_data->wglChoosePixelFormatARB != NULL) &&
slouken@1913
   359
            (_this->gl_data->wglGetPixelFormatAttribivARB != NULL)) {
icculus@6382
   360
            _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_TRUE;
slouken@1913
   361
        }
slouken@1913
   362
    }
slouken@1913
   363
slouken@1913
   364
    /* Check for WGL_EXT_swap_control */
icculus@6382
   365
    _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_FALSE;
slouken@1913
   366
    if (HasExtension("WGL_EXT_swap_control", extensions)) {
slouken@1913
   367
        _this->gl_data->wglSwapIntervalEXT =
slouken@1913
   368
            WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
slouken@1913
   369
        _this->gl_data->wglGetSwapIntervalEXT =
slouken@1913
   370
            WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
icculus@6382
   371
        if (HasExtension("WGL_EXT_swap_control_tear", extensions)) {
icculus@6382
   372
            _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_TRUE;
icculus@6382
   373
        }
slouken@2178
   374
    } else {
slouken@2178
   375
        _this->gl_data->wglSwapIntervalEXT = NULL;
slouken@2178
   376
        _this->gl_data->wglGetSwapIntervalEXT = NULL;
slouken@1913
   377
    }
slouken@2178
   378
}
slouken@1913
   379
slouken@2178
   380
static int
slouken@2178
   381
WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
slouken@2178
   382
{
slouken@2178
   383
    HWND hwnd;
slouken@2178
   384
    HDC hdc;
slouken@2180
   385
    PIXELFORMATDESCRIPTOR pfd;
slouken@2178
   386
    HGLRC hglrc;
slouken@2178
   387
    int pixel_format = 0;
slouken@2178
   388
    unsigned int matching;
slouken@2178
   389
slouken@2178
   390
    hwnd =
slouken@2178
   391
        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
slouken@2178
   392
                     10, 10, NULL, NULL, SDL_Instance, NULL);
slouken@2178
   393
    WIN_PumpEvents(_this);
slouken@2178
   394
slouken@2178
   395
    hdc = GetDC(hwnd);
slouken@2178
   396
slouken@2180
   397
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@2180
   398
slouken@2180
   399
    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
slouken@2180
   400
slouken@2178
   401
    hglrc = _this->gl_data->wglCreateContext(hdc);
slouken@1913
   402
    if (hglrc) {
slouken@2178
   403
        _this->gl_data->wglMakeCurrent(hdc, hglrc);
slouken@2178
   404
slouken@2178
   405
        WIN_GL_InitExtensions(_this, hdc);
slouken@2178
   406
icculus@6382
   407
        if (_this->gl_data->HAS_WGL_ARB_pixel_format) {
slouken@2178
   408
            _this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
slouken@2178
   409
                                                    1, &pixel_format,
slouken@2178
   410
                                                    &matching);
slouken@2178
   411
        }
slouken@2178
   412
slouken@1913
   413
        _this->gl_data->wglMakeCurrent(NULL, NULL);
slouken@1913
   414
        _this->gl_data->wglDeleteContext(hglrc);
slouken@1913
   415
    }
slouken@1913
   416
    ReleaseDC(hwnd, hdc);
slouken@1913
   417
    DestroyWindow(hwnd);
slouken@1913
   418
    WIN_PumpEvents(_this);
slouken@2178
   419
slouken@2178
   420
    return pixel_format;
slouken@1913
   421
}
slouken@1913
   422
slouken@1913
   423
int
slouken@1913
   424
WIN_GL_SetupWindow(_THIS, SDL_Window * window)
slouken@1913
   425
{
slouken@1913
   426
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   427
    PIXELFORMATDESCRIPTOR pfd;
slouken@6296
   428
    int pixel_format = 0;
slouken@1913
   429
    int iAttribs[64];
slouken@1913
   430
    int *iAttr;
slouken@1913
   431
    float fAttribs[1] = { 0 };
slouken@1913
   432
slouken@1913
   433
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@1913
   434
slouken@1913
   435
    /* setup WGL_ARB_pixel_format attribs */
slouken@1913
   436
    iAttr = &iAttribs[0];
slouken@1913
   437
slouken@1913
   438
    *iAttr++ = WGL_DRAW_TO_WINDOW_ARB;
slouken@1913
   439
    *iAttr++ = GL_TRUE;
slouken@1913
   440
    *iAttr++ = WGL_RED_BITS_ARB;
slouken@1913
   441
    *iAttr++ = _this->gl_config.red_size;
slouken@1913
   442
    *iAttr++ = WGL_GREEN_BITS_ARB;
slouken@1913
   443
    *iAttr++ = _this->gl_config.green_size;
slouken@1913
   444
    *iAttr++ = WGL_BLUE_BITS_ARB;
slouken@1913
   445
    *iAttr++ = _this->gl_config.blue_size;
slouken@1913
   446
slouken@1913
   447
    if (_this->gl_config.alpha_size) {
slouken@1913
   448
        *iAttr++ = WGL_ALPHA_BITS_ARB;
slouken@1913
   449
        *iAttr++ = _this->gl_config.alpha_size;
slouken@1913
   450
    }
slouken@1913
   451
slouken@1913
   452
    *iAttr++ = WGL_DOUBLE_BUFFER_ARB;
slouken@1913
   453
    *iAttr++ = _this->gl_config.double_buffer;
slouken@1913
   454
slouken@1913
   455
    *iAttr++ = WGL_DEPTH_BITS_ARB;
slouken@1913
   456
    *iAttr++ = _this->gl_config.depth_size;
slouken@1913
   457
slouken@1913
   458
    if (_this->gl_config.stencil_size) {
slouken@1913
   459
        *iAttr++ = WGL_STENCIL_BITS_ARB;
slouken@1913
   460
        *iAttr++ = _this->gl_config.stencil_size;
slouken@1913
   461
    }
slouken@1913
   462
slouken@1913
   463
    if (_this->gl_config.accum_red_size) {
slouken@1913
   464
        *iAttr++ = WGL_ACCUM_RED_BITS_ARB;
slouken@1913
   465
        *iAttr++ = _this->gl_config.accum_red_size;
slouken@1913
   466
    }
slouken@1913
   467
slouken@1913
   468
    if (_this->gl_config.accum_green_size) {
slouken@1913
   469
        *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB;
slouken@1913
   470
        *iAttr++ = _this->gl_config.accum_green_size;
slouken@1913
   471
    }
slouken@1913
   472
slouken@1913
   473
    if (_this->gl_config.accum_blue_size) {
slouken@1913
   474
        *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB;
slouken@1913
   475
        *iAttr++ = _this->gl_config.accum_blue_size;
slouken@1913
   476
    }
slouken@1913
   477
slouken@1913
   478
    if (_this->gl_config.accum_alpha_size) {
slouken@1913
   479
        *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB;
slouken@1913
   480
        *iAttr++ = _this->gl_config.accum_alpha_size;
slouken@1913
   481
    }
slouken@1913
   482
slouken@1913
   483
    if (_this->gl_config.stereo) {
slouken@1913
   484
        *iAttr++ = WGL_STEREO_ARB;
slouken@1913
   485
        *iAttr++ = GL_TRUE;
slouken@1913
   486
    }
slouken@1913
   487
slouken@1913
   488
    if (_this->gl_config.multisamplebuffers) {
slouken@1913
   489
        *iAttr++ = WGL_SAMPLE_BUFFERS_ARB;
slouken@1913
   490
        *iAttr++ = _this->gl_config.multisamplebuffers;
slouken@1913
   491
    }
slouken@1913
   492
slouken@1913
   493
    if (_this->gl_config.multisamplesamples) {
slouken@1913
   494
        *iAttr++ = WGL_SAMPLES_ARB;
slouken@1913
   495
        *iAttr++ = _this->gl_config.multisamplesamples;
slouken@1913
   496
    }
slouken@1913
   497
slouken@6296
   498
    *iAttr++ = WGL_ACCELERATION_ARB;
slouken@6296
   499
    *iAttr++ = WGL_FULL_ACCELERATION_ARB;
slouken@1913
   500
slouken@1913
   501
    *iAttr = 0;
slouken@1913
   502
slouken@1913
   503
    /* Choose and set the closest available pixel format */
slouken@6296
   504
    if (_this->gl_config.accelerated != 0) {
slouken@6296
   505
        pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
slouken@6296
   506
    }
slouken@6296
   507
    if (!pixel_format && _this->gl_config.accelerated != 1) {
slouken@6296
   508
        iAttr[-1] = WGL_NO_ACCELERATION_ARB;
slouken@6296
   509
	pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
slouken@6296
   510
    }
slouken@2178
   511
    if (!pixel_format) {
slouken@2150
   512
        pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd);
slouken@1913
   513
    }
slouken@1913
   514
    if (!pixel_format) {
slouken@1913
   515
        SDL_SetError("No matching GL pixel format available");
slouken@1913
   516
        return -1;
slouken@1913
   517
    }
slouken@1913
   518
    if (!SetPixelFormat(hdc, pixel_format, &pfd)) {
slouken@1913
   519
        WIN_SetError("SetPixelFormat()");
slouken@1913
   520
        return (-1);
slouken@1913
   521
    }
slouken@1913
   522
    return 0;
slouken@1913
   523
}
slouken@1913
   524
slouken@1913
   525
SDL_GLContext
slouken@1913
   526
WIN_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1913
   527
{
slouken@1913
   528
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@6393
   529
    HGLRC context, share_context;
slouken@1913
   530
slouken@6393
   531
    if (_this->gl_config.share_with_current_context) {
slouken@6393
   532
        share_context = (HGLRC)(_this->current_glctx);
slouken@6393
   533
    } else {
slouken@6393
   534
        share_context = 0;
slouken@6393
   535
    }
slouken@6393
   536
slouken@6393
   537
    if (_this->gl_config.major_version < 3 &&
slouken@6393
   538
	_this->gl_config.profile_mask == 0 &&
slouken@6393
   539
	_this->gl_config.flags == 0) {
slouken@6393
   540
        /* Create legacy context */
slouken@3100
   541
        context = _this->gl_data->wglCreateContext(hdc);
slouken@6393
   542
	if( share_context != 0 ) {
icculus@6406
   543
            _this->gl_data->wglShareLists(share_context, context);
slouken@6393
   544
	}
slouken@3100
   545
    } else {
slouken@3100
   546
        PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
slouken@3100
   547
        HGLRC temp_context = _this->gl_data->wglCreateContext(hdc);
slouken@3100
   548
        if (!temp_context) {
slouken@3139
   549
            SDL_SetError("Could not create GL context");
slouken@3100
   550
            return NULL;
slouken@3100
   551
        }
slouken@3139
   552
slouken@3100
   553
        /* Make the context current */
slouken@3100
   554
        if (WIN_GL_MakeCurrent(_this, window, temp_context) < 0) {
slouken@3100
   555
            WIN_GL_DeleteContext(_this, temp_context);
slouken@3100
   556
            return NULL;
slouken@3100
   557
        }
slouken@3139
   558
slouken@3139
   559
        wglCreateContextAttribsARB =
slouken@3139
   560
            (PFNWGLCREATECONTEXTATTRIBSARBPROC) _this->gl_data->
slouken@3139
   561
            wglGetProcAddress("wglCreateContextAttribsARB");
slouken@3100
   562
        if (!wglCreateContextAttribsARB) {
slouken@3100
   563
            SDL_SetError("GL 3.x is not supported");
slouken@3100
   564
            context = temp_context;
slouken@3100
   565
        } else {
slouken@6296
   566
	    /* max 8 attributes plus terminator */
slouken@6296
   567
            int attribs[9] = {
slouken@3100
   568
                WGL_CONTEXT_MAJOR_VERSION_ARB, _this->gl_config.major_version,
slouken@3100
   569
                WGL_CONTEXT_MINOR_VERSION_ARB, _this->gl_config.minor_version,
slouken@3139
   570
                0
slouken@3100
   571
            };
slouken@6296
   572
	    int iattr = 4;
slouken@6296
   573
slouken@6296
   574
	    /* SDL profile bits match WGL profile bits */
slouken@6296
   575
	    if( _this->gl_config.profile_mask != 0 ) {
slouken@6296
   576
	        attribs[iattr++] = WGL_CONTEXT_PROFILE_MASK_ARB;
slouken@6296
   577
		attribs[iattr++] = _this->gl_config.profile_mask;
slouken@6296
   578
	    }
slouken@6296
   579
slouken@6296
   580
	    /* SDL flags match WGL flags */
slouken@6296
   581
	    if( _this->gl_config.flags != 0 ) {
slouken@6296
   582
	        attribs[iattr++] = WGL_CONTEXT_FLAGS_ARB;
slouken@6296
   583
		attribs[iattr++] = _this->gl_config.flags;
slouken@6296
   584
	    }
slouken@6296
   585
slouken@6296
   586
	    attribs[iattr++] = 0;
slouken@6296
   587
slouken@3100
   588
            /* Create the GL 3.x context */
slouken@6393
   589
            context = wglCreateContextAttribsARB(hdc, share_context, attribs);
slouken@3100
   590
            /* Delete the GL 2.x context */
slouken@3105
   591
            _this->gl_data->wglDeleteContext(temp_context);
slouken@3100
   592
        }
slouken@3100
   593
    }
slouken@3139
   594
slouken@2178
   595
    if (!context) {
slouken@3565
   596
        WIN_SetError("Could not create GL context");
slouken@2178
   597
        return NULL;
slouken@2178
   598
    }
slouken@2178
   599
slouken@2178
   600
    if (WIN_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   601
        WIN_GL_DeleteContext(_this, context);
slouken@2178
   602
        return NULL;
slouken@2178
   603
    }
slouken@2178
   604
slouken@2178
   605
    WIN_GL_InitExtensions(_this, hdc);
slouken@2178
   606
slouken@2178
   607
    return context;
slouken@1913
   608
}
slouken@1913
   609
slouken@1913
   610
int
slouken@1913
   611
WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1913
   612
{
slouken@1913
   613
    HDC hdc;
slouken@1913
   614
    int status;
slouken@1913
   615
slouken@6522
   616
    if (!_this->gl_data) {
slouken@6522
   617
        SDL_SetError("OpenGL not initialized");
slouken@6522
   618
        return -1;
slouken@6522
   619
    }
slouken@6522
   620
slouken@1913
   621
    if (window) {
slouken@1913
   622
        hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   623
    } else {
slouken@1913
   624
        hdc = NULL;
slouken@1913
   625
    }
slouken@1913
   626
    if (!_this->gl_data->wglMakeCurrent(hdc, (HGLRC) context)) {
slouken@1913
   627
        WIN_SetError("wglMakeCurrent()");
slouken@1913
   628
        status = -1;
slouken@1913
   629
    } else {
slouken@1913
   630
        status = 0;
slouken@1913
   631
    }
slouken@1913
   632
    return status;
slouken@1913
   633
}
slouken@1913
   634
slouken@1913
   635
int
slouken@1913
   636
WIN_GL_SetSwapInterval(_THIS, int interval)
slouken@1913
   637
{
icculus@6383
   638
    int retval = -1;
icculus@6382
   639
    if ((interval < 0) && (!_this->gl_data->HAS_WGL_EXT_swap_control_tear)) {
icculus@6382
   640
        SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   641
    } else if (_this->gl_data->wglSwapIntervalEXT) {
icculus@6383
   642
        if (_this->gl_data->wglSwapIntervalEXT(interval) == TRUE) {
icculus@6383
   643
            retval = 0;
icculus@6383
   644
        } else {
icculus@6383
   645
            WIN_SetError("wglSwapIntervalEXT()");
icculus@6383
   646
        }
slouken@1913
   647
    } else {
slouken@1913
   648
        SDL_Unsupported();
slouken@1913
   649
    }
icculus@6383
   650
    return retval;
slouken@1913
   651
}
slouken@1913
   652
slouken@1913
   653
int
slouken@1913
   654
WIN_GL_GetSwapInterval(_THIS)
slouken@1913
   655
{
icculus@6383
   656
    int retval = 0;
slouken@1913
   657
    if (_this->gl_data->wglGetSwapIntervalEXT) {
icculus@6383
   658
        retval = _this->gl_data->wglGetSwapIntervalEXT();
slouken@1913
   659
    }
icculus@6383
   660
    return retval;
slouken@1913
   661
}
slouken@1913
   662
slouken@1913
   663
void
slouken@1913
   664
WIN_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1913
   665
{
slouken@1913
   666
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   667
slouken@1913
   668
    SwapBuffers(hdc);
slouken@1913
   669
}
slouken@1913
   670
slouken@1913
   671
void
slouken@1913
   672
WIN_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1913
   673
{
slouken@6522
   674
    if (!_this->gl_data) {
slouken@6522
   675
        return;
slouken@6522
   676
    }
slouken@1936
   677
    _this->gl_data->wglDeleteContext((HGLRC) context);
slouken@1913
   678
}
slouken@1913
   679
slouken@1952
   680
#endif /* SDL_VIDEO_OPENGL_WGL */
slouken@1913
   681
slouken@6044
   682
#endif /* SDL_VIDEO_DRIVER_WINDOWS */
slouken@6044
   683
slouken@1913
   684
/* vi: set ts=4 sw=4 expandtab: */