src/video/windows/SDL_windowsopengl.c
author Ryan C. Gordon <icculus@icculus.org>
Sat, 19 Aug 2017 15:02:03 -0400
changeset 11332 e3797888c6f1
parent 10806 36f40b8cc979
child 11346 4d2bf1b340cd
permissions -rw-r--r--
opengl: Add support for [GLX|WGL]_ARB_create_context_robustness.

This patch was originally written by Marc Di Luzio for glX and enhanced by
Maximilian Malek for WGL, etc. Thanks to both of you!

Fixes Bugzilla #3643.
Fixes Bugzilla #3735.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2017 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_internal.h"
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#if SDL_VIDEO_DRIVER_WINDOWS
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#include "SDL_assert.h"
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#include "SDL_loadso.h"
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#include "SDL_windowsvideo.h"
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#include "SDL_windowsopengles.h"
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#include "SDL_hints.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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#ifndef WGL_ARB_framebuffer_sRGB
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#define WGL_ARB_framebuffer_sRGB
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#define WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB                0x20A9
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#endif
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#ifndef WGL_ARB_context_flush_control
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#define WGL_ARB_context_flush_control
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#define WGL_CONTEXT_RELEASE_BEHAVIOR_ARB   0x2097
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#define WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB           0x0000
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#define WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB          0x2098
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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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    void *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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    _this->gl_config.dll_handle = SDL_LoadObject(path);
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    if (!_this->gl_config.dll_handle) {
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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 = (struct SDL_GLDriverData *) SDL_calloc(1, sizeof(struct SDL_GLDriverData));
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    if (!_this->gl_data) {
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        return SDL_OutOfMemory();
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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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        SDL_LoadFunction(handle, "wglGetProcAddress");
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    _this->gl_data->wglCreateContext = (HGLRC(WINAPI *) (HDC))
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        SDL_LoadFunction(handle, "wglCreateContext");
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    _this->gl_data->wglDeleteContext = (BOOL(WINAPI *) (HGLRC))
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        SDL_LoadFunction(handle, "wglDeleteContext");
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    _this->gl_data->wglMakeCurrent = (BOOL(WINAPI *) (HDC, HGLRC))
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        SDL_LoadFunction(handle, "wglMakeCurrent");
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    _this->gl_data->wglShareLists = (BOOL(WINAPI *) (HGLRC, HGLRC))
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        SDL_LoadFunction(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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        return SDL_SetError("Could not retrieve OpenGL functions");
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    }
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    /* XXX Too sleazy? WIN_GL_InitExtensions looks for certain OpenGL
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       extensions via SDL_GL_DeduceMaxSupportedESProfile. This uses
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       SDL_GL_ExtensionSupported which in turn calls SDL_GL_GetProcAddress.
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       However SDL_GL_GetProcAddress will fail if the library is not
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       loaded; it checks for gl_config.driver_loaded > 0. To avoid this
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       test failing, increment driver_loaded around the call to
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       WIN_GLInitExtensions.
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       Successful loading of the library is normally indicated by
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       SDL_GL_LoadLibrary incrementing driver_loaded immediately after
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       this function returns 0 to it.
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       Alternatives to this are:
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       - moving SDL_GL_DeduceMaxSupportedESProfile to both the WIN and
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         X11 platforms while adding a function equivalent to
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         SDL_GL_ExtensionSupported but which directly calls
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         glGetProcAddress(). Having 3 copies of the
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         SDL_GL_ExtensionSupported makes this alternative unattractive.
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       - moving SDL_GL_DeduceMaxSupportedESProfile to a new file shared
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         by the WIN and X11 platforms while adding a function equivalent
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         to SDL_GL_ExtensionSupported. This is unattractive due to the
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         number of project files that will need updating, plus there
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         will be 2 copies of the SDL_GL_ExtensionSupported code.
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       - Add a private equivalent of SDL_GL_ExtensionSupported to
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         SDL_video.c.
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       - Move the call to WIN_GL_InitExtensions back to WIN_CreateWindow
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         and add a flag to gl_data to avoid multiple calls to this
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         expensive function. This is probably the least objectionable
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         alternative if this increment/decrement trick is unacceptable.
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       Note that the driver_loaded > 0 check needs to remain in
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       SDL_GL_ExtensionSupported and SDL_GL_GetProcAddress as they are
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       public API functions.
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    */
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    ++_this->gl_config.driver_loaded;
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    WIN_GL_InitExtensions(_this);
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    --_this->gl_config.driver_loaded;
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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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    SDL_UnloadObject(_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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   335
    return best;
slouken@2150
   336
}
slouken@2150
   337
slouken@1913
   338
static SDL_bool
slouken@1913
   339
HasExtension(const char *extension, const char *extensions)
slouken@1913
   340
{
slouken@1913
   341
    const char *start;
slouken@1913
   342
    const char *where, *terminator;
slouken@1913
   343
slouken@1913
   344
    /* Extension names should not have spaces. */
slouken@1913
   345
    where = SDL_strchr(extension, ' ');
slouken@1913
   346
    if (where || *extension == '\0')
slouken@1913
   347
        return SDL_FALSE;
slouken@1913
   348
slouken@1913
   349
    if (!extensions)
slouken@1913
   350
        return SDL_FALSE;
slouken@1913
   351
slouken@1913
   352
    /* It takes a bit of care to be fool-proof about parsing the
slouken@1913
   353
     * OpenGL extensions string. Don't be fooled by sub-strings,
slouken@1913
   354
     * etc. */
slouken@1913
   355
slouken@1913
   356
    start = extensions;
slouken@1913
   357
slouken@1913
   358
    for (;;) {
slouken@1913
   359
        where = SDL_strstr(start, extension);
slouken@1913
   360
        if (!where)
slouken@1913
   361
            break;
slouken@1913
   362
slouken@1913
   363
        terminator = where + SDL_strlen(extension);
slouken@1913
   364
        if (where == start || *(where - 1) == ' ')
slouken@1913
   365
            if (*terminator == ' ' || *terminator == '\0')
slouken@1913
   366
                return SDL_TRUE;
slouken@1913
   367
slouken@1913
   368
        start = terminator;
slouken@1913
   369
    }
slouken@1913
   370
    return SDL_FALSE;
slouken@1913
   371
}
slouken@1913
   372
gabomdq@8021
   373
void
gabomdq@8021
   374
WIN_GL_InitExtensions(_THIS)
slouken@1913
   375
{
slouken@1913
   376
    const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0;
slouken@1913
   377
    const char *extensions;
gabomdq@8021
   378
    HWND hwnd;
gabomdq@8021
   379
    HDC hdc;
gabomdq@8021
   380
    HGLRC hglrc;
gabomdq@8021
   381
    PIXELFORMATDESCRIPTOR pfd;
gabomdq@8021
   382
slouken@8735
   383
    if (!_this->gl_data) {
slouken@8735
   384
        return;
slouken@8735
   385
    }
slouken@8735
   386
gabomdq@8021
   387
    hwnd =
gabomdq@8021
   388
        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
gabomdq@8021
   389
        10, 10, NULL, NULL, SDL_Instance, NULL);
gabomdq@8021
   390
    if (!hwnd) {
gabomdq@8021
   391
        return;
gabomdq@8021
   392
    }
gabomdq@8021
   393
    WIN_PumpEvents(_this);
gabomdq@8021
   394
gabomdq@8021
   395
    hdc = GetDC(hwnd);
gabomdq@8021
   396
gabomdq@8021
   397
    WIN_GL_SetupPixelFormat(_this, &pfd);
gabomdq@8021
   398
gabomdq@8021
   399
    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
gabomdq@8021
   400
gabomdq@8021
   401
    hglrc = _this->gl_data->wglCreateContext(hdc);
gabomdq@8021
   402
    if (!hglrc) {
gabomdq@8021
   403
        return;
gabomdq@8021
   404
    }
gabomdq@8021
   405
    _this->gl_data->wglMakeCurrent(hdc, hglrc);
slouken@1913
   406
slouken@1913
   407
    wglGetExtensionsStringARB = (const char *(WINAPI *) (HDC))
slouken@1913
   408
        _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB");
slouken@1913
   409
    if (wglGetExtensionsStringARB) {
slouken@1913
   410
        extensions = wglGetExtensionsStringARB(hdc);
slouken@1913
   411
    } else {
slouken@1913
   412
        extensions = NULL;
slouken@1913
   413
    }
slouken@1913
   414
slouken@1913
   415
    /* Check for WGL_ARB_pixel_format */
icculus@6382
   416
    _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_FALSE;
slouken@1913
   417
    if (HasExtension("WGL_ARB_pixel_format", extensions)) {
slouken@1913
   418
        _this->gl_data->wglChoosePixelFormatARB = (BOOL(WINAPI *)
slouken@1913
   419
                                                   (HDC, const int *,
slouken@1913
   420
                                                    const FLOAT *, UINT,
slouken@1913
   421
                                                    int *, UINT *))
slouken@1913
   422
            WIN_GL_GetProcAddress(_this, "wglChoosePixelFormatARB");
slouken@1913
   423
        _this->gl_data->wglGetPixelFormatAttribivARB =
slouken@1913
   424
            (BOOL(WINAPI *) (HDC, int, int, UINT, const int *, int *))
slouken@1913
   425
            WIN_GL_GetProcAddress(_this, "wglGetPixelFormatAttribivARB");
slouken@1913
   426
slouken@1913
   427
        if ((_this->gl_data->wglChoosePixelFormatARB != NULL) &&
slouken@1913
   428
            (_this->gl_data->wglGetPixelFormatAttribivARB != NULL)) {
icculus@6382
   429
            _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_TRUE;
slouken@1913
   430
        }
slouken@1913
   431
    }
slouken@1913
   432
slouken@1913
   433
    /* Check for WGL_EXT_swap_control */
icculus@6382
   434
    _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_FALSE;
slouken@1913
   435
    if (HasExtension("WGL_EXT_swap_control", extensions)) {
slouken@1913
   436
        _this->gl_data->wglSwapIntervalEXT =
slouken@1913
   437
            WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
slouken@1913
   438
        _this->gl_data->wglGetSwapIntervalEXT =
slouken@1913
   439
            WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
icculus@6382
   440
        if (HasExtension("WGL_EXT_swap_control_tear", extensions)) {
icculus@6382
   441
            _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_TRUE;
icculus@6382
   442
        }
slouken@2178
   443
    } else {
slouken@2178
   444
        _this->gl_data->wglSwapIntervalEXT = NULL;
slouken@2178
   445
        _this->gl_data->wglGetSwapIntervalEXT = NULL;
slouken@1913
   446
    }
gabomdq@8021
   447
gabomdq@8021
   448
    /* Check for WGL_EXT_create_context_es2_profile */
gabomdq@8021
   449
    if (HasExtension("WGL_EXT_create_context_es2_profile", extensions)) {
slouken@10806
   450
        SDL_GL_DeduceMaxSupportedESProfile(
slouken@10806
   451
            &_this->gl_data->es_profile_max_supported_version.major,
slouken@10806
   452
            &_this->gl_data->es_profile_max_supported_version.minor
slouken@10806
   453
        );
gabomdq@8021
   454
    }
gabomdq@8021
   455
icculus@11332
   456
    /* Check for WGL_ARB_context_flush_control */
icculus@9413
   457
    if (HasExtension("WGL_ARB_context_flush_control", extensions)) {
icculus@9413
   458
        _this->gl_data->HAS_WGL_ARB_context_flush_control = SDL_TRUE;
icculus@9413
   459
    }
icculus@9413
   460
icculus@11332
   461
    /* Check for WGL_ARB_create_context_robustness */
icculus@11332
   462
    if (HasExtension("WGL_ARB_create_context_robustness", extensions)) {
icculus@11332
   463
        _this->gl_data->HAS_WGL_ARB_create_context_robustness = SDL_TRUE;
icculus@11332
   464
    }
icculus@11332
   465
gabomdq@8021
   466
    _this->gl_data->wglMakeCurrent(hdc, NULL);
gabomdq@8021
   467
    _this->gl_data->wglDeleteContext(hglrc);
gabomdq@8021
   468
    ReleaseDC(hwnd, hdc);
gabomdq@8021
   469
    DestroyWindow(hwnd);
gabomdq@8021
   470
    WIN_PumpEvents(_this);
slouken@2178
   471
}
slouken@1913
   472
slouken@2178
   473
static int
slouken@2178
   474
WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
slouken@2178
   475
{
slouken@2178
   476
    HWND hwnd;
slouken@2178
   477
    HDC hdc;
slouken@2180
   478
    PIXELFORMATDESCRIPTOR pfd;
slouken@2178
   479
    HGLRC hglrc;
slouken@2178
   480
    int pixel_format = 0;
slouken@2178
   481
    unsigned int matching;
slouken@2178
   482
slouken@2178
   483
    hwnd =
slouken@2178
   484
        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
slouken@2178
   485
                     10, 10, NULL, NULL, SDL_Instance, NULL);
slouken@2178
   486
    WIN_PumpEvents(_this);
slouken@2178
   487
slouken@2178
   488
    hdc = GetDC(hwnd);
slouken@2178
   489
slouken@2180
   490
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@2180
   491
slouken@2180
   492
    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
slouken@2180
   493
slouken@2178
   494
    hglrc = _this->gl_data->wglCreateContext(hdc);
slouken@1913
   495
    if (hglrc) {
slouken@2178
   496
        _this->gl_data->wglMakeCurrent(hdc, hglrc);
slouken@2178
   497
icculus@6382
   498
        if (_this->gl_data->HAS_WGL_ARB_pixel_format) {
slouken@2178
   499
            _this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
slouken@2178
   500
                                                    1, &pixel_format,
slouken@2178
   501
                                                    &matching);
slouken@2178
   502
        }
slouken@2178
   503
icculus@7553
   504
        _this->gl_data->wglMakeCurrent(hdc, NULL);
slouken@1913
   505
        _this->gl_data->wglDeleteContext(hglrc);
slouken@1913
   506
    }
slouken@1913
   507
    ReleaseDC(hwnd, hdc);
slouken@1913
   508
    DestroyWindow(hwnd);
slouken@1913
   509
    WIN_PumpEvents(_this);
slouken@2178
   510
slouken@2178
   511
    return pixel_format;
slouken@1913
   512
}
slouken@1913
   513
icculus@7559
   514
/* actual work of WIN_GL_SetupWindow() happens here. */
icculus@7559
   515
static int
icculus@7559
   516
WIN_GL_SetupWindowInternal(_THIS, SDL_Window * window)
slouken@1913
   517
{
slouken@1913
   518
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   519
    PIXELFORMATDESCRIPTOR pfd;
slouken@6296
   520
    int pixel_format = 0;
slouken@1913
   521
    int iAttribs[64];
slouken@1913
   522
    int *iAttr;
icculus@7401
   523
    int *iAccelAttr;
slouken@1913
   524
    float fAttribs[1] = { 0 };
slouken@1913
   525
slouken@1913
   526
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@1913
   527
slouken@1913
   528
    /* setup WGL_ARB_pixel_format attribs */
slouken@1913
   529
    iAttr = &iAttribs[0];
slouken@1913
   530
slouken@1913
   531
    *iAttr++ = WGL_DRAW_TO_WINDOW_ARB;
slouken@1913
   532
    *iAttr++ = GL_TRUE;
slouken@1913
   533
    *iAttr++ = WGL_RED_BITS_ARB;
slouken@1913
   534
    *iAttr++ = _this->gl_config.red_size;
slouken@1913
   535
    *iAttr++ = WGL_GREEN_BITS_ARB;
slouken@1913
   536
    *iAttr++ = _this->gl_config.green_size;
slouken@1913
   537
    *iAttr++ = WGL_BLUE_BITS_ARB;
slouken@1913
   538
    *iAttr++ = _this->gl_config.blue_size;
slouken@1913
   539
slouken@1913
   540
    if (_this->gl_config.alpha_size) {
slouken@1913
   541
        *iAttr++ = WGL_ALPHA_BITS_ARB;
slouken@1913
   542
        *iAttr++ = _this->gl_config.alpha_size;
slouken@1913
   543
    }
slouken@1913
   544
slouken@1913
   545
    *iAttr++ = WGL_DOUBLE_BUFFER_ARB;
slouken@1913
   546
    *iAttr++ = _this->gl_config.double_buffer;
slouken@1913
   547
slouken@1913
   548
    *iAttr++ = WGL_DEPTH_BITS_ARB;
slouken@1913
   549
    *iAttr++ = _this->gl_config.depth_size;
slouken@1913
   550
slouken@1913
   551
    if (_this->gl_config.stencil_size) {
slouken@1913
   552
        *iAttr++ = WGL_STENCIL_BITS_ARB;
slouken@1913
   553
        *iAttr++ = _this->gl_config.stencil_size;
slouken@1913
   554
    }
slouken@1913
   555
slouken@1913
   556
    if (_this->gl_config.accum_red_size) {
slouken@1913
   557
        *iAttr++ = WGL_ACCUM_RED_BITS_ARB;
slouken@1913
   558
        *iAttr++ = _this->gl_config.accum_red_size;
slouken@1913
   559
    }
slouken@1913
   560
slouken@1913
   561
    if (_this->gl_config.accum_green_size) {
slouken@1913
   562
        *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB;
slouken@1913
   563
        *iAttr++ = _this->gl_config.accum_green_size;
slouken@1913
   564
    }
slouken@1913
   565
slouken@1913
   566
    if (_this->gl_config.accum_blue_size) {
slouken@1913
   567
        *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB;
slouken@1913
   568
        *iAttr++ = _this->gl_config.accum_blue_size;
slouken@1913
   569
    }
slouken@1913
   570
slouken@1913
   571
    if (_this->gl_config.accum_alpha_size) {
slouken@1913
   572
        *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB;
slouken@1913
   573
        *iAttr++ = _this->gl_config.accum_alpha_size;
slouken@1913
   574
    }
slouken@1913
   575
slouken@1913
   576
    if (_this->gl_config.stereo) {
slouken@1913
   577
        *iAttr++ = WGL_STEREO_ARB;
slouken@1913
   578
        *iAttr++ = GL_TRUE;
slouken@1913
   579
    }
slouken@1913
   580
slouken@1913
   581
    if (_this->gl_config.multisamplebuffers) {
slouken@1913
   582
        *iAttr++ = WGL_SAMPLE_BUFFERS_ARB;
slouken@1913
   583
        *iAttr++ = _this->gl_config.multisamplebuffers;
slouken@1913
   584
    }
slouken@1913
   585
slouken@1913
   586
    if (_this->gl_config.multisamplesamples) {
slouken@1913
   587
        *iAttr++ = WGL_SAMPLES_ARB;
slouken@1913
   588
        *iAttr++ = _this->gl_config.multisamplesamples;
slouken@1913
   589
    }
slouken@1913
   590
icculus@7853
   591
    if (_this->gl_config.framebuffer_srgb_capable) {
icculus@7853
   592
        *iAttr++ = WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB;
icculus@7853
   593
        *iAttr++ = _this->gl_config.framebuffer_srgb_capable;
icculus@7853
   594
    }
icculus@7853
   595
icculus@7401
   596
    /* We always choose either FULL or NO accel on Windows, because of flaky
icculus@7401
   597
       drivers. If the app didn't specify, we use FULL, because that's
icculus@7401
   598
       probably what they wanted (and if you didn't care and got FULL, that's
icculus@7401
   599
       a perfectly valid result in any case). */
slouken@6296
   600
    *iAttr++ = WGL_ACCELERATION_ARB;
icculus@7401
   601
    iAccelAttr = iAttr;
icculus@7401
   602
    if (_this->gl_config.accelerated) {
icculus@7401
   603
        *iAttr++ = WGL_FULL_ACCELERATION_ARB;
icculus@7401
   604
    } else {
icculus@7401
   605
        *iAttr++ = WGL_NO_ACCELERATION_ARB;
icculus@7401
   606
    }
slouken@1913
   607
slouken@1913
   608
    *iAttr = 0;
slouken@1913
   609
slouken@1913
   610
    /* Choose and set the closest available pixel format */
icculus@7401
   611
    pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
icculus@7401
   612
icculus@7401
   613
    /* App said "don't care about accel" and FULL accel failed. Try NO. */
icculus@7401
   614
    if ( ( !pixel_format ) && ( _this->gl_config.accelerated < 0 ) ) {
icculus@7401
   615
        *iAccelAttr = WGL_NO_ACCELERATION_ARB;
slouken@6296
   616
        pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
icculus@7401
   617
        *iAccelAttr = WGL_FULL_ACCELERATION_ARB;  /* if we try again. */
slouken@6296
   618
    }
slouken@2178
   619
    if (!pixel_format) {
slouken@2150
   620
        pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd);
slouken@1913
   621
    }
slouken@1913
   622
    if (!pixel_format) {
icculus@7037
   623
        return SDL_SetError("No matching GL pixel format available");
slouken@1913
   624
    }
slouken@1913
   625
    if (!SetPixelFormat(hdc, pixel_format, &pfd)) {
icculus@7037
   626
        return WIN_SetError("SetPixelFormat()");
slouken@1913
   627
    }
slouken@1913
   628
    return 0;
slouken@1913
   629
}
slouken@1913
   630
icculus@7559
   631
int
icculus@7559
   632
WIN_GL_SetupWindow(_THIS, SDL_Window * window)
icculus@7559
   633
{
icculus@7559
   634
    /* The current context is lost in here; save it and reset it. */
icculus@7559
   635
    SDL_Window *current_win = SDL_GL_GetCurrentWindow();
icculus@7559
   636
    SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
icculus@7559
   637
    const int retval = WIN_GL_SetupWindowInternal(_this, window);
icculus@7559
   638
    WIN_GL_MakeCurrent(_this, current_win, current_ctx);
icculus@7559
   639
    return retval;
icculus@7559
   640
}
icculus@7559
   641
slouken@10806
   642
SDL_bool
slouken@10806
   643
WIN_GL_UseEGL(_THIS)
slouken@10806
   644
{
slouken@10806
   645
    SDL_assert(_this->gl_data != NULL);
slouken@10806
   646
    SDL_assert(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES);
slouken@10806
   647
slouken@10806
   648
    return (SDL_GetHintBoolean(SDL_HINT_OPENGL_ES_DRIVER, SDL_FALSE)
slouken@10806
   649
            || _this->gl_config.major_version == 1 /* No WGL extension for OpenGL ES 1.x profiles. */
slouken@10806
   650
            || _this->gl_config.major_version > _this->gl_data->es_profile_max_supported_version.major
slouken@10806
   651
            || (_this->gl_config.major_version == _this->gl_data->es_profile_max_supported_version.major
slouken@10806
   652
                && _this->gl_config.minor_version > _this->gl_data->es_profile_max_supported_version.minor));
slouken@10806
   653
}
slouken@10806
   654
slouken@1913
   655
SDL_GLContext
slouken@1913
   656
WIN_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1913
   657
{
slouken@1913
   658
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@6393
   659
    HGLRC context, share_context;
slouken@1913
   660
slouken@10806
   661
    if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES && WIN_GL_UseEGL(_this)) {
gabomdq@8022
   662
#if SDL_VIDEO_OPENGL_EGL        
gabomdq@8021
   663
        /* Switch to EGL based functions */
gabomdq@8021
   664
        WIN_GL_UnloadLibrary(_this);
gabomdq@8021
   665
        _this->GL_LoadLibrary = WIN_GLES_LoadLibrary;
gabomdq@8021
   666
        _this->GL_GetProcAddress = WIN_GLES_GetProcAddress;
gabomdq@8021
   667
        _this->GL_UnloadLibrary = WIN_GLES_UnloadLibrary;
gabomdq@8021
   668
        _this->GL_CreateContext = WIN_GLES_CreateContext;
gabomdq@8021
   669
        _this->GL_MakeCurrent = WIN_GLES_MakeCurrent;
gabomdq@8021
   670
        _this->GL_SetSwapInterval = WIN_GLES_SetSwapInterval;
gabomdq@8021
   671
        _this->GL_GetSwapInterval = WIN_GLES_GetSwapInterval;
gabomdq@8021
   672
        _this->GL_SwapWindow = WIN_GLES_SwapWindow;
gabomdq@8021
   673
        _this->GL_DeleteContext = WIN_GLES_DeleteContext;
gabomdq@8021
   674
        
gabomdq@8021
   675
        if (WIN_GLES_LoadLibrary(_this, NULL) != 0) {
gabomdq@8021
   676
            return NULL;
gabomdq@8021
   677
        }
gabomdq@8021
   678
        
gabomdq@8021
   679
        return WIN_GLES_CreateContext(_this, window);
gabomdq@8022
   680
#else
philipp@8080
   681
        SDL_SetError("SDL not configured with EGL support");
philipp@8080
   682
        return NULL;
philipp@8080
   683
#endif
gabomdq@8021
   684
    }
gabomdq@8021
   685
slouken@6393
   686
    if (_this->gl_config.share_with_current_context) {
slouken@7412
   687
        share_context = (HGLRC)SDL_GL_GetCurrentContext();
slouken@6393
   688
    } else {
slouken@6393
   689
        share_context = 0;
slouken@6393
   690
    }
slouken@6393
   691
slouken@6393
   692
    if (_this->gl_config.major_version < 3 &&
slouken@8604
   693
        _this->gl_config.profile_mask == 0 &&
slouken@8604
   694
        _this->gl_config.flags == 0) {
slouken@6393
   695
        /* Create legacy context */
slouken@3100
   696
        context = _this->gl_data->wglCreateContext(hdc);
slouken@8604
   697
        if( share_context != 0 ) {
icculus@6406
   698
            _this->gl_data->wglShareLists(share_context, context);
slouken@8604
   699
        }
slouken@3100
   700
    } else {
slouken@3100
   701
        PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
slouken@3100
   702
        HGLRC temp_context = _this->gl_data->wglCreateContext(hdc);
slouken@3100
   703
        if (!temp_context) {
slouken@3139
   704
            SDL_SetError("Could not create GL context");
slouken@3100
   705
            return NULL;
slouken@3100
   706
        }
slouken@3139
   707
slouken@3100
   708
        /* Make the context current */
slouken@3100
   709
        if (WIN_GL_MakeCurrent(_this, window, temp_context) < 0) {
slouken@3100
   710
            WIN_GL_DeleteContext(_this, temp_context);
slouken@3100
   711
            return NULL;
slouken@3100
   712
        }
slouken@3139
   713
slouken@3139
   714
        wglCreateContextAttribsARB =
slouken@3139
   715
            (PFNWGLCREATECONTEXTATTRIBSARBPROC) _this->gl_data->
slouken@3139
   716
            wglGetProcAddress("wglCreateContextAttribsARB");
slouken@3100
   717
        if (!wglCreateContextAttribsARB) {
slouken@3100
   718
            SDL_SetError("GL 3.x is not supported");
slouken@3100
   719
            context = temp_context;
slouken@3100
   720
        } else {
icculus@11332
   721
        /* max 12 attributes plus terminator */
icculus@11332
   722
            int attribs[13] = {
slouken@3100
   723
                WGL_CONTEXT_MAJOR_VERSION_ARB, _this->gl_config.major_version,
slouken@3100
   724
                WGL_CONTEXT_MINOR_VERSION_ARB, _this->gl_config.minor_version,
slouken@3139
   725
                0
slouken@3100
   726
            };
slime73@9961
   727
            int iattr = 4;
slouken@6296
   728
slime73@9961
   729
            /* SDL profile bits match WGL profile bits */
slime73@9961
   730
            if (_this->gl_config.profile_mask != 0) {
slime73@9961
   731
                attribs[iattr++] = WGL_CONTEXT_PROFILE_MASK_ARB;
slime73@9961
   732
                attribs[iattr++] = _this->gl_config.profile_mask;
slime73@9961
   733
            }
slouken@6296
   734
slime73@9961
   735
            /* SDL flags match WGL flags */
slime73@9961
   736
            if (_this->gl_config.flags != 0) {
slime73@9961
   737
                attribs[iattr++] = WGL_CONTEXT_FLAGS_ARB;
slime73@9961
   738
                attribs[iattr++] = _this->gl_config.flags;
slime73@9961
   739
            }
slouken@6296
   740
slime73@9961
   741
            /* only set if wgl extension is available */
slime73@9961
   742
            if (_this->gl_data->HAS_WGL_ARB_context_flush_control) {
slime73@9961
   743
                attribs[iattr++] = WGL_CONTEXT_RELEASE_BEHAVIOR_ARB;
slime73@9961
   744
                attribs[iattr++] = _this->gl_config.release_behavior ?
icculus@9413
   745
                                    WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB :
icculus@9413
   746
                                    WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB;
slime73@9961
   747
            }
icculus@9413
   748
icculus@11332
   749
            /* only set if wgl extension is available */
icculus@11332
   750
            if (_this->gl_data->HAS_WGL_ARB_create_context_robustness) {
icculus@11332
   751
                attribs[iattr++] = WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB;
icculus@11332
   752
                attribs[iattr++] = _this->gl_config.reset_notification ?
icculus@11332
   753
                                    WGL_LOSE_CONTEXT_ON_RESET_ARB :
icculus@11332
   754
                                    WGL_NO_RESET_NOTIFICATION_ARB;
icculus@11332
   755
            }
icculus@11332
   756
slime73@9961
   757
            attribs[iattr++] = 0;
slouken@6296
   758
slouken@3100
   759
            /* Create the GL 3.x context */
slouken@6393
   760
            context = wglCreateContextAttribsARB(hdc, share_context, attribs);
slouken@3100
   761
            /* Delete the GL 2.x context */
slouken@3105
   762
            _this->gl_data->wglDeleteContext(temp_context);
slouken@3100
   763
        }
slouken@3100
   764
    }
slouken@3139
   765
slouken@2178
   766
    if (!context) {
slouken@3565
   767
        WIN_SetError("Could not create GL context");
slouken@2178
   768
        return NULL;
slouken@2178
   769
    }
slouken@2178
   770
slouken@2178
   771
    if (WIN_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   772
        WIN_GL_DeleteContext(_this, context);
slouken@2178
   773
        return NULL;
slouken@2178
   774
    }
slouken@2178
   775
slouken@2178
   776
    return context;
slouken@1913
   777
}
slouken@1913
   778
slouken@1913
   779
int
slouken@1913
   780
WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1913
   781
{
slouken@1913
   782
    HDC hdc;
slouken@1913
   783
slouken@6522
   784
    if (!_this->gl_data) {
icculus@7037
   785
        return SDL_SetError("OpenGL not initialized");
slouken@6522
   786
    }
slouken@6522
   787
icculus@7553
   788
    /* sanity check that higher level handled this. */
icculus@7553
   789
    SDL_assert(window || (!window && !context));
icculus@7553
   790
icculus@7553
   791
    /* Some Windows drivers freak out if hdc is NULL, even when context is
icculus@7553
   792
       NULL, against spec. Since hdc is _supposed_ to be ignored if context
icculus@7553
   793
       is NULL, we either use the current GL window, or do nothing if we
icculus@7553
   794
       already have no current context. */
icculus@7553
   795
    if (!window) {
icculus@7553
   796
        window = SDL_GL_GetCurrentWindow();
icculus@7553
   797
        if (!window) {
icculus@7553
   798
            SDL_assert(SDL_GL_GetCurrentContext() == NULL);
icculus@7553
   799
            return 0;  /* already done. */
icculus@7553
   800
        }
slouken@1913
   801
    }
icculus@7553
   802
icculus@7553
   803
    hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   804
    if (!_this->gl_data->wglMakeCurrent(hdc, (HGLRC) context)) {
icculus@7037
   805
        return WIN_SetError("wglMakeCurrent()");
slouken@1913
   806
    }
icculus@7037
   807
    return 0;
slouken@1913
   808
}
slouken@1913
   809
slouken@1913
   810
int
slouken@1913
   811
WIN_GL_SetSwapInterval(_THIS, int interval)
slouken@1913
   812
{
icculus@6382
   813
    if ((interval < 0) && (!_this->gl_data->HAS_WGL_EXT_swap_control_tear)) {
icculus@7037
   814
        return SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   815
    } else if (_this->gl_data->wglSwapIntervalEXT) {
icculus@7037
   816
        if (_this->gl_data->wglSwapIntervalEXT(interval) != TRUE) {
icculus@7037
   817
            return WIN_SetError("wglSwapIntervalEXT()");
icculus@6383
   818
        }
slouken@1913
   819
    } else {
icculus@7037
   820
        return SDL_Unsupported();
slouken@1913
   821
    }
icculus@7037
   822
    return 0;
slouken@1913
   823
}
slouken@1913
   824
slouken@1913
   825
int
slouken@1913
   826
WIN_GL_GetSwapInterval(_THIS)
slouken@1913
   827
{
icculus@6383
   828
    int retval = 0;
slouken@1913
   829
    if (_this->gl_data->wglGetSwapIntervalEXT) {
icculus@6383
   830
        retval = _this->gl_data->wglGetSwapIntervalEXT();
slouken@1913
   831
    }
icculus@6383
   832
    return retval;
slouken@1913
   833
}
slouken@1913
   834
slouken@10690
   835
int
slouken@1913
   836
WIN_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1913
   837
{
slouken@1913
   838
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   839
slouken@10690
   840
    if (!SwapBuffers(hdc)) {
slouken@10690
   841
        return WIN_SetError("SwapBuffers()");
slouken@10690
   842
    }
slouken@10690
   843
    return 0;
slouken@1913
   844
}
slouken@1913
   845
slouken@1913
   846
void
slouken@1913
   847
WIN_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1913
   848
{
slouken@6522
   849
    if (!_this->gl_data) {
slouken@6522
   850
        return;
slouken@6522
   851
    }
slouken@1936
   852
    _this->gl_data->wglDeleteContext((HGLRC) context);
slouken@1913
   853
}
slouken@1913
   854
slouken@8144
   855
slouken@8144
   856
SDL_bool
slouken@8144
   857
WIN_GL_SetPixelFormatFrom(_THIS, SDL_Window * fromWindow, SDL_Window * toWindow)
slouken@8144
   858
{
slouken@8144
   859
    HDC hfromdc = ((SDL_WindowData *) fromWindow->driverdata)->hdc;
slouken@8144
   860
    HDC htodc = ((SDL_WindowData *) toWindow->driverdata)->hdc;
slouken@8144
   861
    BOOL result;
slouken@8144
   862
slouken@8144
   863
    /* get the pixel format of the fromWindow */
slouken@8144
   864
    int pixel_format = GetPixelFormat(hfromdc);
slouken@8144
   865
    PIXELFORMATDESCRIPTOR pfd;
slouken@8144
   866
    SDL_memset(&pfd, 0, sizeof(pfd));
slouken@8144
   867
    DescribePixelFormat(hfromdc, pixel_format, sizeof(pfd), &pfd);
slouken@8144
   868
slouken@8144
   869
    /* set the pixel format of the toWindow */
slouken@8144
   870
    result = SetPixelFormat(htodc, pixel_format, &pfd);
slouken@8144
   871
slouken@8144
   872
    return result ? SDL_TRUE : SDL_FALSE;
slouken@8144
   873
}
slouken@8144
   874
slouken@1952
   875
#endif /* SDL_VIDEO_OPENGL_WGL */
slouken@1913
   876
slouken@6044
   877
#endif /* SDL_VIDEO_DRIVER_WINDOWS */
slouken@6044
   878
slouken@1913
   879
/* vi: set ts=4 sw=4 expandtab: */