src/video/windows/SDL_windowsopengl.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 30 Jan 2018 18:08:34 -0800
changeset 11839 971881e55d61
parent 11811 5d94cb6b24d3
child 11872 e917e911dab6
permissions -rw-r--r--
Fixed ISO C99 compatibility
SDL now builds with gcc 7.2 with the following command line options:
-Wall -pedantic-errors -Wno-deprecated-declarations -Wno-overlength-strings --std=c99
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2018 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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#ifndef WGL_ARB_create_context_no_error
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#define WGL_ARB_create_context_no_error
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#define WGL_CONTEXT_OPENGL_NO_ERROR_ARB                 0x31B3
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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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    *(void**)&_this->gl_data->wglGetProcAddress =
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        SDL_LoadFunction(handle, "wglGetProcAddress");
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    *(void**)&_this->gl_data->wglCreateContext =
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        SDL_LoadFunction(handle, "wglCreateContext");
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    *(void**)&_this->gl_data->wglDeleteContext =
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        SDL_LoadFunction(handle, "wglDeleteContext");
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    *(void**)&_this->gl_data->wglMakeCurrent =
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        SDL_LoadFunction(handle, "wglMakeCurrent");
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    *(void**)&_this->gl_data->wglShareLists =
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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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   333
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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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   337
        }
slouken@2150
   338
    }
slouken@2150
   339
slouken@2150
   340
    return best;
slouken@2150
   341
}
slouken@2150
   342
slouken@1913
   343
static SDL_bool
slouken@1913
   344
HasExtension(const char *extension, const char *extensions)
slouken@1913
   345
{
slouken@1913
   346
    const char *start;
slouken@1913
   347
    const char *where, *terminator;
slouken@1913
   348
slouken@1913
   349
    /* Extension names should not have spaces. */
slouken@1913
   350
    where = SDL_strchr(extension, ' ');
slouken@1913
   351
    if (where || *extension == '\0')
slouken@1913
   352
        return SDL_FALSE;
slouken@1913
   353
slouken@1913
   354
    if (!extensions)
slouken@1913
   355
        return SDL_FALSE;
slouken@1913
   356
slouken@1913
   357
    /* It takes a bit of care to be fool-proof about parsing the
slouken@1913
   358
     * OpenGL extensions string. Don't be fooled by sub-strings,
slouken@1913
   359
     * etc. */
slouken@1913
   360
slouken@1913
   361
    start = extensions;
slouken@1913
   362
slouken@1913
   363
    for (;;) {
slouken@1913
   364
        where = SDL_strstr(start, extension);
slouken@1913
   365
        if (!where)
slouken@1913
   366
            break;
slouken@1913
   367
slouken@1913
   368
        terminator = where + SDL_strlen(extension);
slouken@1913
   369
        if (where == start || *(where - 1) == ' ')
slouken@1913
   370
            if (*terminator == ' ' || *terminator == '\0')
slouken@1913
   371
                return SDL_TRUE;
slouken@1913
   372
slouken@1913
   373
        start = terminator;
slouken@1913
   374
    }
slouken@1913
   375
    return SDL_FALSE;
slouken@1913
   376
}
slouken@1913
   377
gabomdq@8021
   378
void
gabomdq@8021
   379
WIN_GL_InitExtensions(_THIS)
slouken@1913
   380
{
slouken@1913
   381
    const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0;
slouken@1913
   382
    const char *extensions;
gabomdq@8021
   383
    HWND hwnd;
gabomdq@8021
   384
    HDC hdc;
gabomdq@8021
   385
    HGLRC hglrc;
gabomdq@8021
   386
    PIXELFORMATDESCRIPTOR pfd;
gabomdq@8021
   387
slouken@8735
   388
    if (!_this->gl_data) {
slouken@8735
   389
        return;
slouken@8735
   390
    }
slouken@8735
   391
gabomdq@8021
   392
    hwnd =
gabomdq@8021
   393
        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
gabomdq@8021
   394
        10, 10, NULL, NULL, SDL_Instance, NULL);
gabomdq@8021
   395
    if (!hwnd) {
gabomdq@8021
   396
        return;
gabomdq@8021
   397
    }
gabomdq@8021
   398
    WIN_PumpEvents(_this);
gabomdq@8021
   399
gabomdq@8021
   400
    hdc = GetDC(hwnd);
gabomdq@8021
   401
gabomdq@8021
   402
    WIN_GL_SetupPixelFormat(_this, &pfd);
gabomdq@8021
   403
gabomdq@8021
   404
    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
gabomdq@8021
   405
gabomdq@8021
   406
    hglrc = _this->gl_data->wglCreateContext(hdc);
gabomdq@8021
   407
    if (!hglrc) {
gabomdq@8021
   408
        return;
gabomdq@8021
   409
    }
gabomdq@8021
   410
    _this->gl_data->wglMakeCurrent(hdc, hglrc);
slouken@1913
   411
slouken@11839
   412
    *(void**)&wglGetExtensionsStringARB =
slouken@1913
   413
        _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB");
slouken@1913
   414
    if (wglGetExtensionsStringARB) {
slouken@1913
   415
        extensions = wglGetExtensionsStringARB(hdc);
slouken@1913
   416
    } else {
slouken@1913
   417
        extensions = NULL;
slouken@1913
   418
    }
slouken@1913
   419
slouken@1913
   420
    /* Check for WGL_ARB_pixel_format */
icculus@6382
   421
    _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_FALSE;
slouken@1913
   422
    if (HasExtension("WGL_ARB_pixel_format", extensions)) {
slouken@11839
   423
        *(void**)&_this->gl_data->wglChoosePixelFormatARB =
slouken@1913
   424
            WIN_GL_GetProcAddress(_this, "wglChoosePixelFormatARB");
slouken@11839
   425
        *(void**)&_this->gl_data->wglGetPixelFormatAttribivARB =
slouken@1913
   426
            WIN_GL_GetProcAddress(_this, "wglGetPixelFormatAttribivARB");
slouken@1913
   427
slouken@1913
   428
        if ((_this->gl_data->wglChoosePixelFormatARB != NULL) &&
slouken@1913
   429
            (_this->gl_data->wglGetPixelFormatAttribivARB != NULL)) {
icculus@6382
   430
            _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_TRUE;
slouken@1913
   431
        }
slouken@1913
   432
    }
slouken@1913
   433
slouken@1913
   434
    /* Check for WGL_EXT_swap_control */
icculus@6382
   435
    _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_FALSE;
slouken@1913
   436
    if (HasExtension("WGL_EXT_swap_control", extensions)) {
slouken@11839
   437
        *(void**)&_this->gl_data->wglSwapIntervalEXT =
slouken@1913
   438
            WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
slouken@11839
   439
        *(void**)&_this->gl_data->wglGetSwapIntervalEXT =
slouken@1913
   440
            WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
icculus@6382
   441
        if (HasExtension("WGL_EXT_swap_control_tear", extensions)) {
icculus@6382
   442
            _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_TRUE;
icculus@6382
   443
        }
slouken@2178
   444
    } else {
slouken@2178
   445
        _this->gl_data->wglSwapIntervalEXT = NULL;
slouken@2178
   446
        _this->gl_data->wglGetSwapIntervalEXT = NULL;
slouken@1913
   447
    }
gabomdq@8021
   448
gabomdq@8021
   449
    /* Check for WGL_EXT_create_context_es2_profile */
gabomdq@8021
   450
    if (HasExtension("WGL_EXT_create_context_es2_profile", extensions)) {
slouken@10806
   451
        SDL_GL_DeduceMaxSupportedESProfile(
slouken@10806
   452
            &_this->gl_data->es_profile_max_supported_version.major,
slouken@10806
   453
            &_this->gl_data->es_profile_max_supported_version.minor
slouken@10806
   454
        );
gabomdq@8021
   455
    }
gabomdq@8021
   456
icculus@11332
   457
    /* Check for WGL_ARB_context_flush_control */
icculus@9413
   458
    if (HasExtension("WGL_ARB_context_flush_control", extensions)) {
icculus@9413
   459
        _this->gl_data->HAS_WGL_ARB_context_flush_control = SDL_TRUE;
icculus@9413
   460
    }
icculus@9413
   461
icculus@11332
   462
    /* Check for WGL_ARB_create_context_robustness */
icculus@11332
   463
    if (HasExtension("WGL_ARB_create_context_robustness", extensions)) {
icculus@11332
   464
        _this->gl_data->HAS_WGL_ARB_create_context_robustness = SDL_TRUE;
icculus@11332
   465
    }
icculus@11332
   466
flibitijibibo@11347
   467
    /* Check for WGL_ARB_create_context_no_error */
flibitijibibo@11347
   468
    if (HasExtension("WGL_ARB_create_context_no_error", extensions)) {
flibitijibibo@11347
   469
        _this->gl_data->HAS_WGL_ARB_create_context_no_error = SDL_TRUE;
flibitijibibo@11347
   470
    }
flibitijibibo@11347
   471
gabomdq@8021
   472
    _this->gl_data->wglMakeCurrent(hdc, NULL);
gabomdq@8021
   473
    _this->gl_data->wglDeleteContext(hglrc);
gabomdq@8021
   474
    ReleaseDC(hwnd, hdc);
gabomdq@8021
   475
    DestroyWindow(hwnd);
gabomdq@8021
   476
    WIN_PumpEvents(_this);
slouken@2178
   477
}
slouken@1913
   478
slouken@2178
   479
static int
slouken@2178
   480
WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
slouken@2178
   481
{
slouken@2178
   482
    HWND hwnd;
slouken@2178
   483
    HDC hdc;
slouken@2180
   484
    PIXELFORMATDESCRIPTOR pfd;
slouken@2178
   485
    HGLRC hglrc;
slouken@2178
   486
    int pixel_format = 0;
slouken@2178
   487
    unsigned int matching;
slouken@2178
   488
slouken@2178
   489
    hwnd =
slouken@2178
   490
        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
slouken@2178
   491
                     10, 10, NULL, NULL, SDL_Instance, NULL);
slouken@2178
   492
    WIN_PumpEvents(_this);
slouken@2178
   493
slouken@2178
   494
    hdc = GetDC(hwnd);
slouken@2178
   495
slouken@2180
   496
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@2180
   497
slouken@2180
   498
    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
slouken@2180
   499
slouken@2178
   500
    hglrc = _this->gl_data->wglCreateContext(hdc);
slouken@1913
   501
    if (hglrc) {
slouken@2178
   502
        _this->gl_data->wglMakeCurrent(hdc, hglrc);
slouken@2178
   503
icculus@6382
   504
        if (_this->gl_data->HAS_WGL_ARB_pixel_format) {
slouken@2178
   505
            _this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
slouken@2178
   506
                                                    1, &pixel_format,
slouken@2178
   507
                                                    &matching);
slouken@2178
   508
        }
slouken@2178
   509
icculus@7553
   510
        _this->gl_data->wglMakeCurrent(hdc, NULL);
slouken@1913
   511
        _this->gl_data->wglDeleteContext(hglrc);
slouken@1913
   512
    }
slouken@1913
   513
    ReleaseDC(hwnd, hdc);
slouken@1913
   514
    DestroyWindow(hwnd);
slouken@1913
   515
    WIN_PumpEvents(_this);
slouken@2178
   516
slouken@2178
   517
    return pixel_format;
slouken@1913
   518
}
slouken@1913
   519
icculus@7559
   520
/* actual work of WIN_GL_SetupWindow() happens here. */
icculus@7559
   521
static int
icculus@7559
   522
WIN_GL_SetupWindowInternal(_THIS, SDL_Window * window)
slouken@1913
   523
{
slouken@1913
   524
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   525
    PIXELFORMATDESCRIPTOR pfd;
slouken@6296
   526
    int pixel_format = 0;
slouken@1913
   527
    int iAttribs[64];
slouken@1913
   528
    int *iAttr;
icculus@7401
   529
    int *iAccelAttr;
slouken@1913
   530
    float fAttribs[1] = { 0 };
slouken@1913
   531
slouken@1913
   532
    WIN_GL_SetupPixelFormat(_this, &pfd);
slouken@1913
   533
slouken@1913
   534
    /* setup WGL_ARB_pixel_format attribs */
slouken@1913
   535
    iAttr = &iAttribs[0];
slouken@1913
   536
slouken@1913
   537
    *iAttr++ = WGL_DRAW_TO_WINDOW_ARB;
slouken@1913
   538
    *iAttr++ = GL_TRUE;
slouken@1913
   539
    *iAttr++ = WGL_RED_BITS_ARB;
slouken@1913
   540
    *iAttr++ = _this->gl_config.red_size;
slouken@1913
   541
    *iAttr++ = WGL_GREEN_BITS_ARB;
slouken@1913
   542
    *iAttr++ = _this->gl_config.green_size;
slouken@1913
   543
    *iAttr++ = WGL_BLUE_BITS_ARB;
slouken@1913
   544
    *iAttr++ = _this->gl_config.blue_size;
slouken@1913
   545
slouken@1913
   546
    if (_this->gl_config.alpha_size) {
slouken@1913
   547
        *iAttr++ = WGL_ALPHA_BITS_ARB;
slouken@1913
   548
        *iAttr++ = _this->gl_config.alpha_size;
slouken@1913
   549
    }
slouken@1913
   550
slouken@1913
   551
    *iAttr++ = WGL_DOUBLE_BUFFER_ARB;
slouken@1913
   552
    *iAttr++ = _this->gl_config.double_buffer;
slouken@1913
   553
slouken@1913
   554
    *iAttr++ = WGL_DEPTH_BITS_ARB;
slouken@1913
   555
    *iAttr++ = _this->gl_config.depth_size;
slouken@1913
   556
slouken@1913
   557
    if (_this->gl_config.stencil_size) {
slouken@1913
   558
        *iAttr++ = WGL_STENCIL_BITS_ARB;
slouken@1913
   559
        *iAttr++ = _this->gl_config.stencil_size;
slouken@1913
   560
    }
slouken@1913
   561
slouken@1913
   562
    if (_this->gl_config.accum_red_size) {
slouken@1913
   563
        *iAttr++ = WGL_ACCUM_RED_BITS_ARB;
slouken@1913
   564
        *iAttr++ = _this->gl_config.accum_red_size;
slouken@1913
   565
    }
slouken@1913
   566
slouken@1913
   567
    if (_this->gl_config.accum_green_size) {
slouken@1913
   568
        *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB;
slouken@1913
   569
        *iAttr++ = _this->gl_config.accum_green_size;
slouken@1913
   570
    }
slouken@1913
   571
slouken@1913
   572
    if (_this->gl_config.accum_blue_size) {
slouken@1913
   573
        *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB;
slouken@1913
   574
        *iAttr++ = _this->gl_config.accum_blue_size;
slouken@1913
   575
    }
slouken@1913
   576
slouken@1913
   577
    if (_this->gl_config.accum_alpha_size) {
slouken@1913
   578
        *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB;
slouken@1913
   579
        *iAttr++ = _this->gl_config.accum_alpha_size;
slouken@1913
   580
    }
slouken@1913
   581
slouken@1913
   582
    if (_this->gl_config.stereo) {
slouken@1913
   583
        *iAttr++ = WGL_STEREO_ARB;
slouken@1913
   584
        *iAttr++ = GL_TRUE;
slouken@1913
   585
    }
slouken@1913
   586
slouken@1913
   587
    if (_this->gl_config.multisamplebuffers) {
slouken@1913
   588
        *iAttr++ = WGL_SAMPLE_BUFFERS_ARB;
slouken@1913
   589
        *iAttr++ = _this->gl_config.multisamplebuffers;
slouken@1913
   590
    }
slouken@1913
   591
slouken@1913
   592
    if (_this->gl_config.multisamplesamples) {
slouken@1913
   593
        *iAttr++ = WGL_SAMPLES_ARB;
slouken@1913
   594
        *iAttr++ = _this->gl_config.multisamplesamples;
slouken@1913
   595
    }
slouken@1913
   596
icculus@7853
   597
    if (_this->gl_config.framebuffer_srgb_capable) {
icculus@7853
   598
        *iAttr++ = WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB;
icculus@7853
   599
        *iAttr++ = _this->gl_config.framebuffer_srgb_capable;
icculus@7853
   600
    }
icculus@7853
   601
icculus@7401
   602
    /* We always choose either FULL or NO accel on Windows, because of flaky
icculus@7401
   603
       drivers. If the app didn't specify, we use FULL, because that's
icculus@7401
   604
       probably what they wanted (and if you didn't care and got FULL, that's
icculus@7401
   605
       a perfectly valid result in any case). */
slouken@6296
   606
    *iAttr++ = WGL_ACCELERATION_ARB;
icculus@7401
   607
    iAccelAttr = iAttr;
icculus@7401
   608
    if (_this->gl_config.accelerated) {
icculus@7401
   609
        *iAttr++ = WGL_FULL_ACCELERATION_ARB;
icculus@7401
   610
    } else {
icculus@7401
   611
        *iAttr++ = WGL_NO_ACCELERATION_ARB;
icculus@7401
   612
    }
slouken@1913
   613
slouken@1913
   614
    *iAttr = 0;
slouken@1913
   615
slouken@1913
   616
    /* Choose and set the closest available pixel format */
icculus@7401
   617
    pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
icculus@7401
   618
icculus@7401
   619
    /* App said "don't care about accel" and FULL accel failed. Try NO. */
icculus@7401
   620
    if ( ( !pixel_format ) && ( _this->gl_config.accelerated < 0 ) ) {
icculus@7401
   621
        *iAccelAttr = WGL_NO_ACCELERATION_ARB;
slouken@6296
   622
        pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
icculus@7401
   623
        *iAccelAttr = WGL_FULL_ACCELERATION_ARB;  /* if we try again. */
slouken@6296
   624
    }
slouken@2178
   625
    if (!pixel_format) {
slouken@2150
   626
        pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd);
slouken@1913
   627
    }
slouken@1913
   628
    if (!pixel_format) {
icculus@7037
   629
        return SDL_SetError("No matching GL pixel format available");
slouken@1913
   630
    }
slouken@1913
   631
    if (!SetPixelFormat(hdc, pixel_format, &pfd)) {
icculus@7037
   632
        return WIN_SetError("SetPixelFormat()");
slouken@1913
   633
    }
slouken@1913
   634
    return 0;
slouken@1913
   635
}
slouken@1913
   636
icculus@7559
   637
int
icculus@7559
   638
WIN_GL_SetupWindow(_THIS, SDL_Window * window)
icculus@7559
   639
{
icculus@7559
   640
    /* The current context is lost in here; save it and reset it. */
icculus@7559
   641
    SDL_Window *current_win = SDL_GL_GetCurrentWindow();
icculus@7559
   642
    SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
icculus@7559
   643
    const int retval = WIN_GL_SetupWindowInternal(_this, window);
icculus@7559
   644
    WIN_GL_MakeCurrent(_this, current_win, current_ctx);
icculus@7559
   645
    return retval;
icculus@7559
   646
}
icculus@7559
   647
slouken@10806
   648
SDL_bool
slouken@10806
   649
WIN_GL_UseEGL(_THIS)
slouken@10806
   650
{
slouken@10806
   651
    SDL_assert(_this->gl_data != NULL);
slouken@10806
   652
    SDL_assert(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES);
slouken@10806
   653
slouken@10806
   654
    return (SDL_GetHintBoolean(SDL_HINT_OPENGL_ES_DRIVER, SDL_FALSE)
slouken@10806
   655
            || _this->gl_config.major_version == 1 /* No WGL extension for OpenGL ES 1.x profiles. */
slouken@10806
   656
            || _this->gl_config.major_version > _this->gl_data->es_profile_max_supported_version.major
slouken@10806
   657
            || (_this->gl_config.major_version == _this->gl_data->es_profile_max_supported_version.major
slouken@10806
   658
                && _this->gl_config.minor_version > _this->gl_data->es_profile_max_supported_version.minor));
slouken@10806
   659
}
slouken@10806
   660
slouken@1913
   661
SDL_GLContext
slouken@1913
   662
WIN_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1913
   663
{
slouken@1913
   664
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@6393
   665
    HGLRC context, share_context;
slouken@1913
   666
slouken@10806
   667
    if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES && WIN_GL_UseEGL(_this)) {
gabomdq@8022
   668
#if SDL_VIDEO_OPENGL_EGL        
gabomdq@8021
   669
        /* Switch to EGL based functions */
gabomdq@8021
   670
        WIN_GL_UnloadLibrary(_this);
gabomdq@8021
   671
        _this->GL_LoadLibrary = WIN_GLES_LoadLibrary;
gabomdq@8021
   672
        _this->GL_GetProcAddress = WIN_GLES_GetProcAddress;
gabomdq@8021
   673
        _this->GL_UnloadLibrary = WIN_GLES_UnloadLibrary;
gabomdq@8021
   674
        _this->GL_CreateContext = WIN_GLES_CreateContext;
gabomdq@8021
   675
        _this->GL_MakeCurrent = WIN_GLES_MakeCurrent;
gabomdq@8021
   676
        _this->GL_SetSwapInterval = WIN_GLES_SetSwapInterval;
gabomdq@8021
   677
        _this->GL_GetSwapInterval = WIN_GLES_GetSwapInterval;
gabomdq@8021
   678
        _this->GL_SwapWindow = WIN_GLES_SwapWindow;
gabomdq@8021
   679
        _this->GL_DeleteContext = WIN_GLES_DeleteContext;
gabomdq@8021
   680
        
gabomdq@8021
   681
        if (WIN_GLES_LoadLibrary(_this, NULL) != 0) {
gabomdq@8021
   682
            return NULL;
gabomdq@8021
   683
        }
gabomdq@8021
   684
        
gabomdq@8021
   685
        return WIN_GLES_CreateContext(_this, window);
gabomdq@8022
   686
#else
philipp@8080
   687
        SDL_SetError("SDL not configured with EGL support");
philipp@8080
   688
        return NULL;
philipp@8080
   689
#endif
gabomdq@8021
   690
    }
gabomdq@8021
   691
slouken@6393
   692
    if (_this->gl_config.share_with_current_context) {
slouken@7412
   693
        share_context = (HGLRC)SDL_GL_GetCurrentContext();
slouken@6393
   694
    } else {
slouken@6393
   695
        share_context = 0;
slouken@6393
   696
    }
slouken@6393
   697
slouken@6393
   698
    if (_this->gl_config.major_version < 3 &&
slouken@8604
   699
        _this->gl_config.profile_mask == 0 &&
slouken@8604
   700
        _this->gl_config.flags == 0) {
slouken@6393
   701
        /* Create legacy context */
slouken@3100
   702
        context = _this->gl_data->wglCreateContext(hdc);
slouken@8604
   703
        if( share_context != 0 ) {
icculus@6406
   704
            _this->gl_data->wglShareLists(share_context, context);
slouken@8604
   705
        }
slouken@3100
   706
    } else {
slouken@3100
   707
        PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
slouken@3100
   708
        HGLRC temp_context = _this->gl_data->wglCreateContext(hdc);
slouken@3100
   709
        if (!temp_context) {
slouken@3139
   710
            SDL_SetError("Could not create GL context");
slouken@3100
   711
            return NULL;
slouken@3100
   712
        }
slouken@3139
   713
slouken@3100
   714
        /* Make the context current */
slouken@3100
   715
        if (WIN_GL_MakeCurrent(_this, window, temp_context) < 0) {
slouken@3100
   716
            WIN_GL_DeleteContext(_this, temp_context);
slouken@3100
   717
            return NULL;
slouken@3100
   718
        }
slouken@3139
   719
slouken@11839
   720
        *(void**)&wglCreateContextAttribsARB =
slouken@11839
   721
            _this->gl_data->wglGetProcAddress("wglCreateContextAttribsARB");
slouken@3100
   722
        if (!wglCreateContextAttribsARB) {
slouken@3100
   723
            SDL_SetError("GL 3.x is not supported");
slouken@3100
   724
            context = temp_context;
slouken@3100
   725
        } else {
icculus@11351
   726
            int attribs[15];  /* max 14 attributes plus terminator */
icculus@11351
   727
            int iattr = 0;
icculus@11351
   728
icculus@11351
   729
            attribs[iattr++] = WGL_CONTEXT_MAJOR_VERSION_ARB;
icculus@11351
   730
            attribs[iattr++] = _this->gl_config.major_version;
icculus@11351
   731
            attribs[iattr++] = WGL_CONTEXT_MINOR_VERSION_ARB;
icculus@11351
   732
            attribs[iattr++] = _this->gl_config.minor_version;
slouken@6296
   733
slime73@9961
   734
            /* SDL profile bits match WGL profile bits */
slime73@9961
   735
            if (_this->gl_config.profile_mask != 0) {
slime73@9961
   736
                attribs[iattr++] = WGL_CONTEXT_PROFILE_MASK_ARB;
slime73@9961
   737
                attribs[iattr++] = _this->gl_config.profile_mask;
slime73@9961
   738
            }
slouken@6296
   739
slime73@9961
   740
            /* SDL flags match WGL flags */
slime73@9961
   741
            if (_this->gl_config.flags != 0) {
slime73@9961
   742
                attribs[iattr++] = WGL_CONTEXT_FLAGS_ARB;
slime73@9961
   743
                attribs[iattr++] = _this->gl_config.flags;
slime73@9961
   744
            }
slouken@6296
   745
slime73@9961
   746
            /* only set if wgl extension is available */
slime73@9961
   747
            if (_this->gl_data->HAS_WGL_ARB_context_flush_control) {
slime73@9961
   748
                attribs[iattr++] = WGL_CONTEXT_RELEASE_BEHAVIOR_ARB;
slime73@9961
   749
                attribs[iattr++] = _this->gl_config.release_behavior ?
icculus@9413
   750
                                    WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB :
icculus@9413
   751
                                    WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB;
slime73@9961
   752
            }
icculus@9413
   753
icculus@11332
   754
            /* only set if wgl extension is available */
icculus@11332
   755
            if (_this->gl_data->HAS_WGL_ARB_create_context_robustness) {
icculus@11332
   756
                attribs[iattr++] = WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB;
icculus@11332
   757
                attribs[iattr++] = _this->gl_config.reset_notification ?
icculus@11332
   758
                                    WGL_LOSE_CONTEXT_ON_RESET_ARB :
icculus@11332
   759
                                    WGL_NO_RESET_NOTIFICATION_ARB;
icculus@11332
   760
            }
icculus@11332
   761
flibitijibibo@11347
   762
            /* only set if wgl extension is available */
flibitijibibo@11347
   763
            if (_this->gl_data->HAS_WGL_ARB_create_context_no_error) {
flibitijibibo@11347
   764
                attribs[iattr++] = WGL_CONTEXT_OPENGL_NO_ERROR_ARB;
flibitijibibo@11347
   765
                attribs[iattr++] = _this->gl_config.no_error;
flibitijibibo@11347
   766
            }
flibitijibibo@11347
   767
slime73@9961
   768
            attribs[iattr++] = 0;
slouken@6296
   769
slouken@3100
   770
            /* Create the GL 3.x context */
slouken@6393
   771
            context = wglCreateContextAttribsARB(hdc, share_context, attribs);
slouken@3100
   772
            /* Delete the GL 2.x context */
slouken@3105
   773
            _this->gl_data->wglDeleteContext(temp_context);
slouken@3100
   774
        }
slouken@3100
   775
    }
slouken@3139
   776
slouken@2178
   777
    if (!context) {
slouken@3565
   778
        WIN_SetError("Could not create GL context");
slouken@2178
   779
        return NULL;
slouken@2178
   780
    }
slouken@2178
   781
slouken@2178
   782
    if (WIN_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   783
        WIN_GL_DeleteContext(_this, context);
slouken@2178
   784
        return NULL;
slouken@2178
   785
    }
slouken@2178
   786
slouken@2178
   787
    return context;
slouken@1913
   788
}
slouken@1913
   789
slouken@1913
   790
int
slouken@1913
   791
WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1913
   792
{
slouken@1913
   793
    HDC hdc;
slouken@1913
   794
slouken@6522
   795
    if (!_this->gl_data) {
icculus@7037
   796
        return SDL_SetError("OpenGL not initialized");
slouken@6522
   797
    }
slouken@6522
   798
icculus@7553
   799
    /* sanity check that higher level handled this. */
icculus@7553
   800
    SDL_assert(window || (!window && !context));
icculus@7553
   801
icculus@7553
   802
    /* Some Windows drivers freak out if hdc is NULL, even when context is
icculus@7553
   803
       NULL, against spec. Since hdc is _supposed_ to be ignored if context
icculus@7553
   804
       is NULL, we either use the current GL window, or do nothing if we
icculus@7553
   805
       already have no current context. */
icculus@7553
   806
    if (!window) {
icculus@7553
   807
        window = SDL_GL_GetCurrentWindow();
icculus@7553
   808
        if (!window) {
icculus@7553
   809
            SDL_assert(SDL_GL_GetCurrentContext() == NULL);
icculus@7553
   810
            return 0;  /* already done. */
icculus@7553
   811
        }
slouken@1913
   812
    }
icculus@7553
   813
icculus@7553
   814
    hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   815
    if (!_this->gl_data->wglMakeCurrent(hdc, (HGLRC) context)) {
icculus@7037
   816
        return WIN_SetError("wglMakeCurrent()");
slouken@1913
   817
    }
icculus@7037
   818
    return 0;
slouken@1913
   819
}
slouken@1913
   820
slouken@1913
   821
int
slouken@1913
   822
WIN_GL_SetSwapInterval(_THIS, int interval)
slouken@1913
   823
{
icculus@6382
   824
    if ((interval < 0) && (!_this->gl_data->HAS_WGL_EXT_swap_control_tear)) {
icculus@7037
   825
        return SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   826
    } else if (_this->gl_data->wglSwapIntervalEXT) {
icculus@7037
   827
        if (_this->gl_data->wglSwapIntervalEXT(interval) != TRUE) {
icculus@7037
   828
            return WIN_SetError("wglSwapIntervalEXT()");
icculus@6383
   829
        }
slouken@1913
   830
    } else {
icculus@7037
   831
        return SDL_Unsupported();
slouken@1913
   832
    }
icculus@7037
   833
    return 0;
slouken@1913
   834
}
slouken@1913
   835
slouken@1913
   836
int
slouken@1913
   837
WIN_GL_GetSwapInterval(_THIS)
slouken@1913
   838
{
icculus@6383
   839
    int retval = 0;
slouken@1913
   840
    if (_this->gl_data->wglGetSwapIntervalEXT) {
icculus@6383
   841
        retval = _this->gl_data->wglGetSwapIntervalEXT();
slouken@1913
   842
    }
icculus@6383
   843
    return retval;
slouken@1913
   844
}
slouken@1913
   845
slouken@10690
   846
int
slouken@1913
   847
WIN_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1913
   848
{
slouken@1913
   849
    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
slouken@1913
   850
slouken@10690
   851
    if (!SwapBuffers(hdc)) {
slouken@10690
   852
        return WIN_SetError("SwapBuffers()");
slouken@10690
   853
    }
slouken@10690
   854
    return 0;
slouken@1913
   855
}
slouken@1913
   856
slouken@1913
   857
void
slouken@1913
   858
WIN_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1913
   859
{
slouken@6522
   860
    if (!_this->gl_data) {
slouken@6522
   861
        return;
slouken@6522
   862
    }
slouken@1936
   863
    _this->gl_data->wglDeleteContext((HGLRC) context);
slouken@1913
   864
}
slouken@1913
   865
slouken@8144
   866
slouken@8144
   867
SDL_bool
slouken@8144
   868
WIN_GL_SetPixelFormatFrom(_THIS, SDL_Window * fromWindow, SDL_Window * toWindow)
slouken@8144
   869
{
slouken@8144
   870
    HDC hfromdc = ((SDL_WindowData *) fromWindow->driverdata)->hdc;
slouken@8144
   871
    HDC htodc = ((SDL_WindowData *) toWindow->driverdata)->hdc;
slouken@8144
   872
    BOOL result;
slouken@8144
   873
slouken@8144
   874
    /* get the pixel format of the fromWindow */
slouken@8144
   875
    int pixel_format = GetPixelFormat(hfromdc);
slouken@8144
   876
    PIXELFORMATDESCRIPTOR pfd;
slouken@8144
   877
    SDL_memset(&pfd, 0, sizeof(pfd));
slouken@8144
   878
    DescribePixelFormat(hfromdc, pixel_format, sizeof(pfd), &pfd);
slouken@8144
   879
slouken@8144
   880
    /* set the pixel format of the toWindow */
slouken@8144
   881
    result = SetPixelFormat(htodc, pixel_format, &pfd);
slouken@8144
   882
slouken@8144
   883
    return result ? SDL_TRUE : SDL_FALSE;
slouken@8144
   884
}
slouken@8144
   885
slouken@1952
   886
#endif /* SDL_VIDEO_OPENGL_WGL */
slouken@1913
   887
slouken@6044
   888
#endif /* SDL_VIDEO_DRIVER_WINDOWS */
slouken@6044
   889
slouken@1913
   890
/* vi: set ts=4 sw=4 expandtab: */