src/video/x11/SDL_x11opengl.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 18 May 2013 14:17:52 -0700
changeset 7191 75360622e65f
parent 7037 3fedf1f25b94
child 7412 50211a1fd557
permissions -rw-r--r--
File style cleanup for the SDL 2.0 release
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_X11
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#include "SDL_x11video.h"
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#include "SDL_assert.h"
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/* GLX implementation of SDL OpenGL support */
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#if SDL_VIDEO_OPENGL_GLX
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#include "SDL_loadso.h"
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#include "SDL_x11opengles.h"
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#if defined(__IRIX__)
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/* IRIX doesn't have a GL library versioning system */
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#define DEFAULT_OPENGL  "libGL.so"
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#elif defined(__MACOSX__)
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#define DEFAULT_OPENGL  "/usr/X11R6/lib/libGL.1.dylib"
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#elif defined(__QNXNTO__)
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#define DEFAULT_OPENGL  "libGL.so.3"
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#else
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#define DEFAULT_OPENGL  "libGL.so.1"
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#endif
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#ifndef GLX_NONE_EXT
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#define GLX_NONE_EXT                       0x8000
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#endif
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#ifndef GLX_ARB_multisample
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#define GLX_ARB_multisample
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#define GLX_SAMPLE_BUFFERS_ARB             100000
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#define GLX_SAMPLES_ARB                    100001
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#endif
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#ifndef GLX_EXT_visual_rating
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#define GLX_EXT_visual_rating
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#define GLX_VISUAL_CAVEAT_EXT              0x20
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#define GLX_NONE_EXT                       0x8000
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#define GLX_SLOW_VISUAL_EXT                0x8001
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#define GLX_NON_CONFORMANT_VISUAL_EXT      0x800D
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#endif
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#ifndef GLX_EXT_visual_info
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#define GLX_EXT_visual_info
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#define GLX_X_VISUAL_TYPE_EXT              0x22
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#define GLX_DIRECT_COLOR_EXT               0x8003
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#endif
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#ifndef GLX_ARB_create_context
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#define GLX_ARB_create_context
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#define GLX_CONTEXT_MAJOR_VERSION_ARB      0x2091
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#define GLX_CONTEXT_MINOR_VERSION_ARB      0x2092
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#define GLX_CONTEXT_FLAGS_ARB              0x2094
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#define GLX_CONTEXT_DEBUG_BIT_ARB          0x0001
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#define GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x0002
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/* Typedef for the GL 3.0 context creation function */
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typedef GLXContext(*PFNGLXCREATECONTEXTATTRIBSARBPROC) (Display * dpy,
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                                                        GLXFBConfig config,
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                                                        GLXContext
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                                                        share_context,
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                                                        Bool direct,
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                                                        const int
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                                                        *attrib_list);
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#endif
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#ifndef GLX_ARB_create_context_profile
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#define GLX_ARB_create_context_profile
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#define GLX_CONTEXT_PROFILE_MASK_ARB       0x9126
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#define GLX_CONTEXT_CORE_PROFILE_BIT_ARB   0x00000001
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#define GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
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#endif
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#ifndef GLX_ARB_create_context_robustness
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#define GLX_ARB_create_context_robustness
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#define GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB  0x00000004
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#define GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB     0x8256
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#define GLX_NO_RESET_NOTIFICATION_ARB                   0x8261
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#define GLX_LOSE_CONTEXT_ON_RESET_ARB                   0x8252
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#endif
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#ifndef GLX_EXT_create_context_es2_profile
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#define GLX_EXT_create_context_es2_profile
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#ifndef GLX_CONTEXT_ES2_PROFILE_BIT_EXT
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#define GLX_CONTEXT_ES2_PROFILE_BIT_EXT    0x00000002
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#endif
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#endif
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#ifndef GLX_EXT_swap_control
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#define GLX_SWAP_INTERVAL_EXT              0x20F1
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#define GLX_MAX_SWAP_INTERVAL_EXT          0x20F2
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#endif
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#ifndef GLX_EXT_swap_control_tear
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#define GLX_LATE_SWAPS_TEAR_EXT 0x20F3
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#endif
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#define OPENGL_REQUIRES_DLOPEN
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#if defined(OPENGL_REQUIRES_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
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#include <dlfcn.h>
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#define GL_LoadObject(X)    dlopen(X, (RTLD_NOW|RTLD_GLOBAL))
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#define GL_LoadFunction     dlsym
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#define GL_UnloadObject     dlclose
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#else
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#define GL_LoadObject   SDL_LoadObject
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#define GL_LoadFunction SDL_LoadFunction
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#define GL_UnloadObject SDL_UnloadObject
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#endif
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static void X11_GL_InitExtensions(_THIS);
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int
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X11_GL_LoadLibrary(_THIS, const char *path)
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{
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    void *handle;
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    if (_this->gl_data) {
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        return SDL_SetError("OpenGL context already created");
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    }
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    /* If SDL_GL_CONTEXT_EGL has been changed to 1, switch over to X11_GLES functions  */
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    if (_this->gl_config.use_egl == 1) {
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#if SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
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        _this->GL_LoadLibrary = X11_GLES_LoadLibrary;
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        _this->GL_GetProcAddress = X11_GLES_GetProcAddress;
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        _this->GL_UnloadLibrary = X11_GLES_UnloadLibrary;
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        _this->GL_CreateContext = X11_GLES_CreateContext;
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        _this->GL_MakeCurrent = X11_GLES_MakeCurrent;
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        _this->GL_SetSwapInterval = X11_GLES_SetSwapInterval;
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        _this->GL_GetSwapInterval = X11_GLES_GetSwapInterval;
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        _this->GL_SwapWindow = X11_GLES_SwapWindow;
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        _this->GL_DeleteContext = X11_GLES_DeleteContext;
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        return X11_GLES_LoadLibrary(_this, path);
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#else
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        return SDL_SetError("SDL not configured with OpenGL ES/EGL support");
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#endif
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    }
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    /* Load the OpenGL library */
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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 = GL_LoadObject(path);
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    if (!_this->gl_config.dll_handle) {
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#if defined(OPENGL_REQUIRES_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
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        SDL_SetError("Failed loading %s: %s", path, dlerror());
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#endif
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        return -1;
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    }
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    SDL_strlcpy(_this->gl_config.driver_path, path,
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                SDL_arraysize(_this->gl_config.driver_path));
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    /* Allocate OpenGL memory */
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    _this->gl_data =
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        (struct SDL_GLDriverData *) SDL_calloc(1,
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                                               sizeof(struct
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                                                      SDL_GLDriverData));
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    if (!_this->gl_data) {
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        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->glXGetProcAddress =
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        (void *(*)(const GLubyte *))
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            GL_LoadFunction(handle, "glXGetProcAddressARB");
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    _this->gl_data->glXChooseVisual =
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        (XVisualInfo * (*)(Display *, int, int *))
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            X11_GL_GetProcAddress(_this, "glXChooseVisual");
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    _this->gl_data->glXCreateContext =
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        (GLXContext(*)(Display *, XVisualInfo *, GLXContext, int))
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            X11_GL_GetProcAddress(_this, "glXCreateContext");
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    _this->gl_data->glXDestroyContext =
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        (void (*)(Display *, GLXContext))
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            X11_GL_GetProcAddress(_this, "glXDestroyContext");
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    _this->gl_data->glXMakeCurrent =
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        (int (*)(Display *, GLXDrawable, GLXContext))
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            X11_GL_GetProcAddress(_this, "glXMakeCurrent");
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    _this->gl_data->glXSwapBuffers =
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        (void (*)(Display *, GLXDrawable))
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            X11_GL_GetProcAddress(_this, "glXSwapBuffers");
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    _this->gl_data->glXQueryDrawable =
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        (void (*)(Display*,GLXDrawable,int,unsigned int*))
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            X11_GL_GetProcAddress(_this, "glXQueryDrawable");
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    if (!_this->gl_data->glXChooseVisual ||
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        !_this->gl_data->glXCreateContext ||
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        !_this->gl_data->glXDestroyContext ||
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        !_this->gl_data->glXMakeCurrent ||
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        !_this->gl_data->glXSwapBuffers) {
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        return SDL_SetError("Could not retrieve OpenGL functions");
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    }
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    /* Initialize extensions */
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    X11_GL_InitExtensions(_this);
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    return 0;
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}
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void *
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X11_GL_GetProcAddress(_THIS, const char *proc)
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{
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    if (_this->gl_data->glXGetProcAddress) {
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        return _this->gl_data->glXGetProcAddress((const GLubyte *) proc);
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    }
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    return GL_LoadFunction(_this->gl_config.dll_handle, proc);
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}
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void
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X11_GL_UnloadLibrary(_THIS)
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{
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    /* Don't actually unload the library, since it may have registered
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     * X11 shutdown hooks, per the notes at:
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     * http://dri.sourceforge.net/doc/DRIuserguide.html
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     */
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#if 0
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    GL_UnloadObject(_this->gl_config.dll_handle);
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    _this->gl_config.dll_handle = NULL;
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#endif
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    /* Free OpenGL memory */
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    if (_this->gl_data) {
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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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}
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static SDL_bool
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HasExtension(const char *extension, const char *extensions)
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{
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    const char *start;
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    const char *where, *terminator;
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    /* Extension names should not have spaces. */
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    where = SDL_strchr(extension, ' ');
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    if (where || *extension == '\0')
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        return SDL_FALSE;
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    if (!extensions)
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        return SDL_FALSE;
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    /* It takes a bit of care to be fool-proof about parsing the
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     * OpenGL extensions string. Don't be fooled by sub-strings,
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     * etc. */
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    start = extensions;
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    for (;;) {
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        where = SDL_strstr(start, extension);
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        if (!where)
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            break;
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        terminator = where + SDL_strlen(extension);
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        if (where == start || *(where - 1) == ' ')
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            if (*terminator == ' ' || *terminator == '\0')
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                return SDL_TRUE;
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        start = terminator;
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    }
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    return SDL_FALSE;
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}
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static void
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X11_GL_InitExtensions(_THIS)
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{
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    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
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    int screen = DefaultScreen(display);
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    XVisualInfo *vinfo;
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    XSetWindowAttributes xattr;
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    Window w;
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    GLXContext context;
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    const char *(*glXQueryExtensionsStringFunc) (Display *, int);
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    const char *extensions;
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    vinfo = X11_GL_GetVisual(_this, display, screen);
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    if (!vinfo) {
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        return;
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    }
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    xattr.background_pixel = 0;
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    xattr.border_pixel = 0;
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    xattr.colormap =
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        XCreateColormap(display, RootWindow(display, screen), vinfo->visual,
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                        AllocNone);
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    w = XCreateWindow(display, RootWindow(display, screen), 0, 0, 32, 32, 0,
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                      vinfo->depth, InputOutput, vinfo->visual,
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                      (CWBackPixel | CWBorderPixel | CWColormap), &xattr);
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    context = _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
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    if (context) {
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        _this->gl_data->glXMakeCurrent(display, w, context);
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    }
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    XFree(vinfo);
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    glXQueryExtensionsStringFunc =
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        (const char *(*)(Display *, int)) X11_GL_GetProcAddress(_this,
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                                                                "glXQueryExtensionsString");
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    if (glXQueryExtensionsStringFunc) {
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        extensions = glXQueryExtensionsStringFunc(display, screen);
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    } else {
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        extensions = NULL;
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    }
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    /* Check for GLX_EXT_swap_control(_tear) */
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    _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_FALSE;
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    if (HasExtension("GLX_EXT_swap_control", extensions)) {
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        _this->gl_data->glXSwapIntervalEXT =
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            (void (*)(Display*,GLXDrawable,int))
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                X11_GL_GetProcAddress(_this, "glXSwapIntervalEXT");
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        if (HasExtension("GLX_EXT_swap_control_tear", extensions)) {
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            _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_TRUE;
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        }
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    }
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    /* Check for GLX_MESA_swap_control */
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    if (HasExtension("GLX_MESA_swap_control", extensions)) {
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        _this->gl_data->glXSwapIntervalMESA =
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            (int(*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalMESA");
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        _this->gl_data->glXGetSwapIntervalMESA =
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            (int(*)(void)) X11_GL_GetProcAddress(_this,
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                                                   "glXGetSwapIntervalMESA");
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    }
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    /* Check for GLX_SGI_swap_control */
icculus@5572
   348
    if (HasExtension("GLX_SGI_swap_control", extensions)) {
icculus@5572
   349
        _this->gl_data->glXSwapIntervalSGI =
icculus@5572
   350
            (int (*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");
icculus@5572
   351
    }
icculus@5572
   352
slouken@1952
   353
    /* Check for GLX_EXT_visual_rating */
slouken@1952
   354
    if (HasExtension("GLX_EXT_visual_rating", extensions)) {
slouken@1952
   355
        _this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;
slouken@1952
   356
    }
slouken@1952
   357
mikesart@6570
   358
    /* Check for GLX_EXT_visual_info */
mikesart@6570
   359
    if (HasExtension("GLX_EXT_visual_info", extensions)) {
mikesart@6570
   360
        _this->gl_data->HAS_GLX_EXT_visual_info = SDL_TRUE;
mikesart@6570
   361
    }
mikesart@6570
   362
slouken@1952
   363
    if (context) {
slouken@1952
   364
        _this->gl_data->glXMakeCurrent(display, None, NULL);
slouken@1952
   365
        _this->gl_data->glXDestroyContext(display, context);
slouken@1952
   366
    }
slouken@1952
   367
    XDestroyWindow(display, w);
bob@2323
   368
    X11_PumpEvents(_this);
slouken@1952
   369
}
slouken@1952
   370
slouken@6296
   371
/* glXChooseVisual and glXChooseFBConfig have some small differences in
slouken@7191
   372
 * the attribute encoding, it can be chosen with the for_FBConfig parameter.
slouken@6296
   373
 */
slouken@7191
   374
int
slouken@6296
   375
X11_GL_GetAttributes(_THIS, Display * display, int screen, int * attribs, int size, Bool for_FBConfig)
slouken@1952
   376
{
slouken@5395
   377
    int i = 0;
slouken@7191
   378
    const int MAX_ATTRIBUTES = 64;
slouken@1952
   379
slouken@7191
   380
    /* assert buffer is large enough to hold all SDL attributes. */
mikesart@6570
   381
    SDL_assert(size >= MAX_ATTRIBUTES);
slouken@3139
   382
slouken@1952
   383
    /* Setup our GLX attributes according to the gl_config. */
slouken@6296
   384
    if( for_FBConfig ) {
slouken@6296
   385
        attribs[i++] = GLX_RENDER_TYPE;
slouken@7191
   386
    attribs[i++] = GLX_RGBA_BIT;
slouken@6296
   387
    } else {
slouken@6296
   388
        attribs[i++] = GLX_RGBA;
slouken@6296
   389
    }
slouken@1952
   390
    attribs[i++] = GLX_RED_SIZE;
slouken@1952
   391
    attribs[i++] = _this->gl_config.red_size;
slouken@1952
   392
    attribs[i++] = GLX_GREEN_SIZE;
slouken@1952
   393
    attribs[i++] = _this->gl_config.green_size;
slouken@1952
   394
    attribs[i++] = GLX_BLUE_SIZE;
slouken@1952
   395
    attribs[i++] = _this->gl_config.blue_size;
slouken@1952
   396
slouken@1952
   397
    if (_this->gl_config.alpha_size) {
slouken@1952
   398
        attribs[i++] = GLX_ALPHA_SIZE;
slouken@1952
   399
        attribs[i++] = _this->gl_config.alpha_size;
slouken@1952
   400
    }
slouken@1952
   401
slouken@1952
   402
    if (_this->gl_config.double_buffer) {
slouken@1952
   403
        attribs[i++] = GLX_DOUBLEBUFFER;
slouken@7191
   404
    if( for_FBConfig )
slouken@7191
   405
        attribs[i++] = True;
slouken@1952
   406
    }
slouken@1952
   407
slouken@1952
   408
    attribs[i++] = GLX_DEPTH_SIZE;
slouken@1952
   409
    attribs[i++] = _this->gl_config.depth_size;
slouken@1952
   410
slouken@1952
   411
    if (_this->gl_config.stencil_size) {
slouken@1952
   412
        attribs[i++] = GLX_STENCIL_SIZE;
slouken@1952
   413
        attribs[i++] = _this->gl_config.stencil_size;
slouken@1952
   414
    }
slouken@1952
   415
slouken@1952
   416
    if (_this->gl_config.accum_red_size) {
slouken@1952
   417
        attribs[i++] = GLX_ACCUM_RED_SIZE;
slouken@1952
   418
        attribs[i++] = _this->gl_config.accum_red_size;
slouken@1952
   419
    }
slouken@1952
   420
slouken@1952
   421
    if (_this->gl_config.accum_green_size) {
slouken@1952
   422
        attribs[i++] = GLX_ACCUM_GREEN_SIZE;
slouken@1952
   423
        attribs[i++] = _this->gl_config.accum_green_size;
slouken@1952
   424
    }
slouken@1952
   425
slouken@1952
   426
    if (_this->gl_config.accum_blue_size) {
slouken@1952
   427
        attribs[i++] = GLX_ACCUM_BLUE_SIZE;
slouken@1952
   428
        attribs[i++] = _this->gl_config.accum_blue_size;
slouken@1952
   429
    }
slouken@1952
   430
slouken@1952
   431
    if (_this->gl_config.accum_alpha_size) {
slouken@1952
   432
        attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
slouken@1952
   433
        attribs[i++] = _this->gl_config.accum_alpha_size;
slouken@1952
   434
    }
slouken@1952
   435
slouken@1952
   436
    if (_this->gl_config.stereo) {
slouken@1952
   437
        attribs[i++] = GLX_STEREO;
slouken@7191
   438
    if( for_FBConfig )
slouken@7191
   439
        attribs[i++] = True;
slouken@1952
   440
    }
slouken@1952
   441
slouken@1952
   442
    if (_this->gl_config.multisamplebuffers) {
slouken@1952
   443
        attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
slouken@1952
   444
        attribs[i++] = _this->gl_config.multisamplebuffers;
slouken@1952
   445
    }
slouken@1952
   446
slouken@1952
   447
    if (_this->gl_config.multisamplesamples) {
slouken@1952
   448
        attribs[i++] = GLX_SAMPLES_ARB;
slouken@1952
   449
        attribs[i++] = _this->gl_config.multisamplesamples;
slouken@1952
   450
    }
slouken@1952
   451
slouken@3571
   452
    if (_this->gl_config.accelerated >= 0 &&
slouken@3571
   453
        _this->gl_data->HAS_GLX_EXT_visual_rating) {
slouken@1952
   454
        attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
slouken@3570
   455
        attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
slouken@3570
   456
                                                      GLX_SLOW_VISUAL_EXT;
slouken@1952
   457
    }
slouken@3570
   458
icculus@6817
   459
    /* If we're supposed to use DirectColor visuals, and we've got the
icculus@6817
   460
       EXT_visual_info extension, then add GLX_X_VISUAL_TYPE_EXT. */
mikesart@6570
   461
    if (X11_UseDirectColorVisuals() &&
mikesart@6570
   462
        _this->gl_data->HAS_GLX_EXT_visual_info) {
mikesart@6570
   463
        attribs[i++] = GLX_X_VISUAL_TYPE_EXT;
mikesart@6570
   464
        attribs[i++] = GLX_DIRECT_COLOR_EXT;
mikesart@6570
   465
    }
mikesart@6570
   466
slouken@1952
   467
    attribs[i++] = None;
mikesart@6570
   468
mikesart@6570
   469
    SDL_assert(i <= MAX_ATTRIBUTES);
slouken@7191
   470
slouken@5395
   471
    return i;
slouken@5395
   472
}
slouken@5395
   473
slouken@5395
   474
XVisualInfo *
slouken@5395
   475
X11_GL_GetVisual(_THIS, Display * display, int screen)
slouken@5395
   476
{
slouken@5395
   477
    XVisualInfo *vinfo;
slouken@5395
   478
slouken@5395
   479
    /* 64 seems nice. */
slouken@6296
   480
    int attribs[64];
icculus@6359
   481
    X11_GL_GetAttributes(_this,display,screen,attribs,64,SDL_FALSE);
slouken@1952
   482
slouken@6181
   483
    if (!_this->gl_data) {
slouken@6181
   484
        /* The OpenGL library wasn't loaded, SDL_GetError() should have info */
slouken@6181
   485
        return NULL;
slouken@6181
   486
    }
slouken@6181
   487
slouken@1952
   488
    vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
slouken@1952
   489
    if (!vinfo) {
slouken@1952
   490
        SDL_SetError("Couldn't find matching GLX visual");
slouken@1952
   491
    }
slouken@1952
   492
    return vinfo;
slouken@1952
   493
}
slouken@1952
   494
slouken@6988
   495
#ifndef GLXBadContext
slouken@6988
   496
#define GLXBadContext 0
slouken@6988
   497
#endif
slouken@6988
   498
#ifndef GLXBadFBConfig
slouken@6988
   499
#define GLXBadFBConfig 9
slouken@6988
   500
#endif
slouken@6988
   501
#ifndef GLXBadProfileARB
slouken@6988
   502
#define GLXBadProfileARB 13
slouken@6988
   503
#endif
slouken@6988
   504
static int (*handler) (Display *, XErrorEvent *) = NULL;
slouken@6988
   505
static int
slouken@6988
   506
X11_GL_CreateContextErrorHandler(Display * d, XErrorEvent * e)
slouken@6988
   507
{
slouken@6988
   508
    switch (e->error_code) {
slouken@6988
   509
    case GLXBadContext:
slouken@6988
   510
    case GLXBadFBConfig:
slouken@6988
   511
    case GLXBadProfileARB:
slouken@6988
   512
    case BadRequest:
slouken@6988
   513
    case BadMatch:
slouken@6988
   514
    case BadValue:
slouken@6988
   515
    case BadAlloc:
slouken@6988
   516
        return (0);
slouken@6988
   517
    default:
slouken@6988
   518
        return (handler(d, e));
slouken@6988
   519
    }
slouken@6988
   520
}
slouken@6988
   521
slouken@1952
   522
SDL_GLContext
slouken@1952
   523
X11_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1952
   524
{
slouken@1952
   525
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   526
    Display *display = data->videodata->display;
slouken@1952
   527
    int screen =
slouken@5246
   528
        ((SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata)->screen;
slouken@1952
   529
    XWindowAttributes xattr;
slouken@1952
   530
    XVisualInfo v, *vinfo;
slouken@1952
   531
    int n;
slouken@6393
   532
    GLXContext context = NULL, share_context;
slouken@6393
   533
slouken@6393
   534
    if (_this->gl_config.share_with_current_context) {
slouken@6393
   535
        share_context = (GLXContext)(_this->current_glctx);
slouken@6393
   536
    } else {
slouken@6393
   537
        share_context = NULL;
slouken@6393
   538
    }
slouken@1952
   539
slouken@1955
   540
    /* We do this to create a clean separation between X and GLX errors. */
slouken@1952
   541
    XSync(display, False);
slouken@6988
   542
    handler = XSetErrorHandler(X11_GL_CreateContextErrorHandler);
slouken@3685
   543
    XGetWindowAttributes(display, data->xwindow, &xattr);
slouken@1952
   544
    v.screen = screen;
slouken@1952
   545
    v.visualid = XVisualIDFromVisual(xattr.visual);
slouken@1952
   546
    vinfo = XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);
slouken@1952
   547
    if (vinfo) {
slouken@6393
   548
        if (_this->gl_config.major_version < 3 &&
slouken@6393
   549
            _this->gl_config.profile_mask == 0 &&
slouken@6393
   550
            _this->gl_config.flags == 0) {
slouken@6393
   551
            /* Create legacy context */
slouken@3100
   552
            context =
slouken@6393
   553
                _this->gl_data->glXCreateContext(display, vinfo, share_context, True);
slouken@3100
   554
        } else {
slouken@3100
   555
            /* If we want a GL 3.0 context or later we need to get a temporary
slouken@3100
   556
               context to grab the new context creation function */
slouken@3139
   557
            GLXContext temp_context =
slouken@3139
   558
                _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
slouken@6988
   559
            if (temp_context) {
slouken@6393
   560
                /* max 8 attributes plus terminator */
slouken@6296
   561
                int attribs[9] = {
slouken@3139
   562
                    GLX_CONTEXT_MAJOR_VERSION_ARB,
slouken@3139
   563
                    _this->gl_config.major_version,
slouken@3139
   564
                    GLX_CONTEXT_MINOR_VERSION_ARB,
slouken@3139
   565
                    _this->gl_config.minor_version,
slouken@3139
   566
                    0
slouken@3100
   567
                };
slouken@6393
   568
                int iattr = 4;
slouken@6296
   569
slouken@6393
   570
                /* SDL profile bits match GLX profile bits */
slouken@6393
   571
                if( _this->gl_config.profile_mask != 0 ) {
slouken@6393
   572
                    attribs[iattr++] = GLX_CONTEXT_PROFILE_MASK_ARB;
slouken@6393
   573
                    attribs[iattr++] = _this->gl_config.profile_mask;
slouken@6393
   574
                }
slouken@6296
   575
slouken@6393
   576
                /* SDL flags match GLX flags */
slouken@6393
   577
                if( _this->gl_config.flags != 0 ) {
slouken@6393
   578
                    attribs[iattr++] = GLX_CONTEXT_FLAGS_ARB;
slouken@6393
   579
                    attribs[iattr++] = _this->gl_config.flags;
slouken@6393
   580
                }
slouken@6296
   581
slouken@6393
   582
                attribs[iattr++] = 0;
slouken@3139
   583
slouken@3100
   584
                /* Get a pointer to the context creation function for GL 3.0 */
slouken@3139
   585
                PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs =
slouken@3139
   586
                    (PFNGLXCREATECONTEXTATTRIBSARBPROC) _this->gl_data->
slouken@3139
   587
                    glXGetProcAddress((GLubyte *)
slouken@3139
   588
                                      "glXCreateContextAttribsARB");
slouken@3100
   589
                if (!glXCreateContextAttribs) {
slouken@3100
   590
                    SDL_SetError("GL 3.x is not supported");
slouken@3100
   591
                    context = temp_context;
slouken@3100
   592
                } else {
slouken@5395
   593
                    int glxAttribs[64];
slouken@5395
   594
slouken@3105
   595
                    /* Create a GL 3.x context */
slouken@3100
   596
                    GLXFBConfig *framebuffer_config = NULL;
slouken@3139
   597
                    int fbcount = 0;
slouken@3139
   598
                    GLXFBConfig *(*glXChooseFBConfig) (Display * disp,
slouken@3139
   599
                                                       int screen,
slouken@3139
   600
                                                       const int *attrib_list,
slouken@3139
   601
                                                       int *nelements);
slouken@3105
   602
slouken@3139
   603
                    glXChooseFBConfig =
slouken@3139
   604
                        (GLXFBConfig *
slouken@3139
   605
                         (*)(Display *, int, const int *,
slouken@3139
   606
                             int *)) _this->gl_data->
slouken@3139
   607
                        glXGetProcAddress((GLubyte *) "glXChooseFBConfig");
slouken@3105
   608
slouken@6296
   609
                    X11_GL_GetAttributes(_this,display,screen,glxAttribs,64,SDL_TRUE);
slouken@5395
   610
slouken@3139
   611
                    if (!glXChooseFBConfig
slouken@3139
   612
                        || !(framebuffer_config =
slouken@3139
   613
                             glXChooseFBConfig(display,
slouken@5395
   614
                                               DefaultScreen(display), glxAttribs,
slouken@3139
   615
                                               &fbcount))) {
slouken@3139
   616
                        SDL_SetError
slouken@3139
   617
                            ("No good framebuffers found. GL 3.x disabled");
slouken@3100
   618
                        context = temp_context;
slouken@3139
   619
                    } else {
slouken@3139
   620
                        context =
slouken@3139
   621
                            glXCreateContextAttribs(display,
slouken@3139
   622
                                                    framebuffer_config[0],
slouken@6393
   623
                                                    share_context, True, attribs);
slouken@3139
   624
                        _this->gl_data->glXDestroyContext(display,
slouken@3139
   625
                                                          temp_context);
slouken@3100
   626
                    }
slouken@3100
   627
                }
slouken@3100
   628
            }
slouken@3100
   629
        }
slouken@1952
   630
        XFree(vinfo);
slouken@1952
   631
    }
slouken@1952
   632
    XSync(display, False);
slouken@6988
   633
    XSetErrorHandler(handler);
slouken@7191
   634
slouken@1952
   635
    if (!context) {
slouken@1952
   636
        SDL_SetError("Could not create GL context");
slouken@2178
   637
        return NULL;
slouken@1952
   638
    }
slouken@2178
   639
slouken@2178
   640
    if (X11_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   641
        X11_GL_DeleteContext(_this, context);
slouken@2178
   642
        return NULL;
slouken@2178
   643
    }
slouken@2178
   644
slouken@2178
   645
    return context;
slouken@1952
   646
}
slouken@1952
   647
slouken@1952
   648
int
slouken@1952
   649
X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1952
   650
{
slouken@1952
   651
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   652
    Window drawable =
urkle@6794
   653
        (context ? ((SDL_WindowData *) window->driverdata)->xwindow : None);
slouken@1952
   654
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   655
slouken@6522
   656
    if (!_this->gl_data) {
icculus@7037
   657
        return SDL_SetError("OpenGL not initialized");
slouken@6522
   658
    }
slouken@6522
   659
slouken@1952
   660
    if (!_this->gl_data->glXMakeCurrent(display, drawable, glx_context)) {
icculus@7037
   661
        return SDL_SetError("Unable to make GL context current");
slouken@1952
   662
    }
slouken@1952
   663
icculus@7037
   664
    return 0;
slouken@1952
   665
}
slouken@1952
   666
slouken@7191
   667
/*
icculus@5572
   668
   0 is a valid argument to glxSwapInterval(MESA|EXT) and setting it to 0
icculus@5572
   669
   will undo the effect of a previous call with a value that is greater
icculus@5572
   670
   than zero (or at least that is what the docs say). OTOH, 0 is an invalid
icculus@5572
   671
   argument to glxSwapIntervalSGI and it returns an error if you call it
icculus@5572
   672
   with 0 as an argument.
bob@2327
   673
*/
bob@2327
   674
bob@2327
   675
static int swapinterval = -1;
slouken@1952
   676
int
slouken@1952
   677
X11_GL_SetSwapInterval(_THIS, int interval)
slouken@1952
   678
{
icculus@6382
   679
    int status = -1;
slouken@1952
   680
icculus@6382
   681
    if ((interval < 0) && (!_this->gl_data->HAS_GLX_EXT_swap_control_tear)) {
icculus@6382
   682
        SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   683
    } else if (_this->gl_data->glXSwapIntervalEXT) {
icculus@5572
   684
        Display *display = ((SDL_VideoData *) _this->driverdata)->display;
icculus@5572
   685
        const SDL_WindowData *windowdata = (SDL_WindowData *)
icculus@5572
   686
            _this->current_glwin->driverdata;
slouken@6846
   687
icculus@5572
   688
        Window drawable = windowdata->xwindow;
slouken@6846
   689
slouken@6846
   690
        /*
slouken@6846
   691
         * This is a workaround for a bug in NVIDIA drivers. Bug has been reported
slouken@6846
   692
         * and will be fixed in a future release (probably 319.xx).
slouken@6846
   693
         *
slouken@6846
   694
         * There's a bug where glXSetSwapIntervalEXT ignores updates because
slouken@6846
   695
         * it has the wrong value cached. To work around it, we just run a no-op
slouken@6846
   696
         * update to the current value.
slouken@6846
   697
         */
slouken@6851
   698
        int currentInterval = X11_GL_GetSwapInterval(_this);
slouken@6846
   699
        _this->gl_data->glXSwapIntervalEXT(display, drawable, currentInterval);
slouken@6846
   700
        _this->gl_data->glXSwapIntervalEXT(display, drawable, interval);
slouken@6846
   701
slouken@6846
   702
        status = 0;
slouken@6846
   703
        swapinterval = interval;
icculus@5572
   704
    } else if (_this->gl_data->glXSwapIntervalMESA) {
slouken@1952
   705
        status = _this->gl_data->glXSwapIntervalMESA(interval);
slouken@1952
   706
        if (status != 0) {
slouken@1952
   707
            SDL_SetError("glxSwapIntervalMESA failed");
bob@2327
   708
        } else {
bob@2327
   709
            swapinterval = interval;
slouken@1952
   710
        }
slouken@1952
   711
    } else if (_this->gl_data->glXSwapIntervalSGI) {
slouken@1952
   712
        status = _this->gl_data->glXSwapIntervalSGI(interval);
slouken@1952
   713
        if (status != 0) {
slouken@1952
   714
            SDL_SetError("glxSwapIntervalSGI failed");
bob@2327
   715
        } else {
bob@2327
   716
            swapinterval = interval;
slouken@1952
   717
        }
slouken@1952
   718
    } else {
slouken@1952
   719
        SDL_Unsupported();
slouken@1952
   720
    }
slouken@1952
   721
    return status;
slouken@1952
   722
}
slouken@1952
   723
slouken@1952
   724
int
slouken@1952
   725
X11_GL_GetSwapInterval(_THIS)
slouken@1952
   726
{
icculus@5572
   727
    if (_this->gl_data->glXSwapIntervalEXT) {
icculus@5572
   728
        Display *display = ((SDL_VideoData *) _this->driverdata)->display;
icculus@5572
   729
        const SDL_WindowData *windowdata = (SDL_WindowData *)
icculus@5572
   730
            _this->current_glwin->driverdata;
icculus@5572
   731
        Window drawable = windowdata->xwindow;
icculus@6382
   732
        unsigned int allow_late_swap_tearing = 0;
icculus@6382
   733
        unsigned int interval = 0;
icculus@6382
   734
icculus@6382
   735
        if (_this->gl_data->HAS_GLX_EXT_swap_control_tear) {
icculus@6382
   736
            _this->gl_data->glXQueryDrawable(display, drawable,
icculus@6382
   737
                                            GLX_LATE_SWAPS_TEAR_EXT,
icculus@6382
   738
                                            &allow_late_swap_tearing);
icculus@6382
   739
        }
icculus@6382
   740
icculus@5572
   741
        _this->gl_data->glXQueryDrawable(display, drawable,
icculus@6382
   742
                                         GLX_SWAP_INTERVAL_EXT, &interval);
icculus@6382
   743
icculus@6382
   744
        if ((allow_late_swap_tearing) && (interval > 0)) {
icculus@6382
   745
            return -((int) interval);
icculus@6382
   746
        }
icculus@6382
   747
icculus@6382
   748
        return (int) interval;
icculus@5572
   749
    } else if (_this->gl_data->glXGetSwapIntervalMESA) {
slouken@1952
   750
        return _this->gl_data->glXGetSwapIntervalMESA();
slouken@1952
   751
    } else {
bob@2327
   752
        return swapinterval;
slouken@1952
   753
    }
slouken@1952
   754
}
slouken@1952
   755
slouken@1952
   756
void
slouken@1952
   757
X11_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1952
   758
{
slouken@1952
   759
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   760
    Display *display = data->videodata->display;
slouken@1952
   761
slouken@3685
   762
    _this->gl_data->glXSwapBuffers(display, data->xwindow);
slouken@1952
   763
}
slouken@1952
   764
slouken@1952
   765
void
slouken@1952
   766
X11_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1952
   767
{
slouken@1952
   768
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   769
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   770
slouken@6522
   771
    if (!_this->gl_data) {
slouken@6522
   772
        return;
slouken@6522
   773
    }
slouken@1952
   774
    _this->gl_data->glXDestroyContext(display, glx_context);
bob@2324
   775
    XSync(display, False);
slouken@1952
   776
}
slouken@1952
   777
slouken@1952
   778
#endif /* SDL_VIDEO_OPENGL_GLX */
slouken@1952
   779
slouken@6044
   780
#endif /* SDL_VIDEO_DRIVER_X11 */
slouken@6044
   781
slouken@1952
   782
/* vi: set ts=4 sw=4 expandtab: */