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0e45984fa0
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().
142 lines
4.7 KiB
C
142 lines
4.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2015 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 && SDL_VIDEO_OPENGL_EGL
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#include "SDL_windowsvideo.h"
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#include "SDL_windowsopengles.h"
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#include "SDL_windowsopengl.h"
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#include "SDL_log.h"
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/* EGL implementation of SDL OpenGL support */
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int
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WIN_GLES_LoadLibrary(_THIS, const char *path) {
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/* If the profile requested is not GL ES, switch over to WIN_GL functions */
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if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
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#if SDL_VIDEO_OPENGL_WGL
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WIN_GLES_UnloadLibrary(_this);
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_this->GL_LoadLibrary = WIN_GL_LoadLibrary;
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_this->GL_GetProcAddress = WIN_GL_GetProcAddress;
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_this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
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_this->GL_CreateContext = WIN_GL_CreateContext;
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_this->GL_MakeCurrent = WIN_GL_MakeCurrent;
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_this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
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_this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
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_this->GL_SwapWindow = WIN_GL_SwapWindow;
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_this->GL_DeleteContext = WIN_GL_DeleteContext;
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return WIN_GL_LoadLibrary(_this, path);
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#else
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return SDL_SetError("SDL not configured with OpenGL/WGL support");
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#endif
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}
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if (_this->egl_data == NULL) {
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return SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY);
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}
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return 0;
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}
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SDL_GLContext
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WIN_GLES_CreateContext(_THIS, SDL_Window * window)
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{
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SDL_GLContext context;
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SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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#if SDL_VIDEO_OPENGL_WGL
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if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
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/* Switch to WGL based functions */
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WIN_GLES_UnloadLibrary(_this);
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_this->GL_LoadLibrary = WIN_GL_LoadLibrary;
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_this->GL_GetProcAddress = WIN_GL_GetProcAddress;
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_this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
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_this->GL_CreateContext = WIN_GL_CreateContext;
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_this->GL_MakeCurrent = WIN_GL_MakeCurrent;
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_this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
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_this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
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_this->GL_SwapWindow = WIN_GL_SwapWindow;
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_this->GL_DeleteContext = WIN_GL_DeleteContext;
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if (WIN_GL_LoadLibrary(_this, NULL) != 0) {
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return NULL;
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}
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return WIN_GL_CreateContext(_this, window);
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}
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#endif
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context = SDL_EGL_CreateContext(_this, data->egl_surface);
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return context;
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}
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void
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WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
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{
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SDL_EGL_DeleteContext(_this, context);
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WIN_GLES_UnloadLibrary(_this);
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}
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SDL_EGL_SwapWindow_impl(WIN)
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SDL_EGL_MakeCurrent_impl(WIN)
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int
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WIN_GLES_SetupWindow(_THIS, SDL_Window * window)
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{
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/* The current context is lost in here; save it and reset it. */
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SDL_WindowData *windowdata = (SDL_WindowData *) window->driverdata;
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SDL_Window *current_win = SDL_GL_GetCurrentWindow();
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SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
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if (_this->egl_data == NULL) {
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if (SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY) < 0) {
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return -1;
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}
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}
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/* Create the GLES window surface */
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windowdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windowdata->hwnd);
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if (windowdata->egl_surface == EGL_NO_SURFACE) {
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return SDL_SetError("Could not create GLES window surface");
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}
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return WIN_GLES_MakeCurrent(_this, current_win, current_ctx);
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}
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int
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WIN_GLES_SetSwapInterval(_THIS, int interval)
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{
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/* FIXME: This should call SDL_EGL_SetSwapInterval, but ANGLE has a bug that prevents this
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* from working if we do (the window contents freeze and don't swap properly). So, we ignore
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* the request for now.
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*/
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SDL_Log("WARNING: Ignoring SDL_GL_SetSwapInterval call due to ANGLE bug");
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return 0;
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}
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#endif /* SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL */
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/* vi: set ts=4 sw=4 expandtab: */
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