src/video/x11/SDL_x11opengl.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 01 Nov 2016 10:46:47 -0700
changeset 10568 0cbc922ef093
parent 10173 5b0a869a9946
child 10609 d702ecbd8ba7
permissions -rw-r--r--
Patch from Tapani Pälli to fix a memory leak in X11_GL_CreateContext
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2016 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_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_ARB_framebuffer_sRGB
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#define GLX_ARB_framebuffer_sRGB
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#ifndef GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB
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#define GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB                0x20B2
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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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#ifndef GLX_ARB_context_flush_control
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#define GLX_ARB_context_flush_control
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#define GLX_CONTEXT_RELEASE_BEHAVIOR_ARB   0x2097
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#define GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB           0x0000
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#define GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB          0x2098
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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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    Display *display;
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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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    /* 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->glXQueryExtension =
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        (Bool (*)(Display *, int *, int *))
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            GL_LoadFunction(handle, "glXQueryExtension");
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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->glXQueryExtension ||
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        !_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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    display = ((SDL_VideoData *) _this->driverdata)->display;
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    if (!_this->gl_data->glXQueryExtension(display, &_this->gl_data->errorBase, &_this->gl_data->eventBase)) {
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        return SDL_SetError("GLX is not supported");
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    }
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    /* Initialize extensions */
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    X11_GL_InitExtensions(_this);
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    /* If we need a GL ES context and there's no  
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     * GLX_EXT_create_context_es2_profile extension, switch over to X11_GLES functions  
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     */
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    if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES && 
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        ! _this->gl_data->HAS_GLX_EXT_create_context_es2_profile ) {
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#if SDL_VIDEO_OPENGL_EGL
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        X11_GL_UnloadLibrary(_this);
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        /* Better avoid conflicts! */
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        if (_this->gl_config.dll_handle != NULL ) {
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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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        }
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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, NULL);
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#else
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        return SDL_SetError("SDL not configured with EGL support");
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#endif
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    }
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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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    SDL_free(_this->gl_data);
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    _this->gl_data = NULL;
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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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    if (!extensions)
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        return SDL_FALSE;
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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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    /* 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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    const int screen = DefaultScreen(display);
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    const char *(*glXQueryExtensionsStringFunc) (Display *, int);
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    const char *extensions;
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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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   342
            _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_TRUE;
icculus@6382
   343
        }
slouken@1952
   344
    }
slouken@1952
   345
slouken@1952
   346
    /* Check for GLX_MESA_swap_control */
slouken@1952
   347
    if (HasExtension("GLX_MESA_swap_control", extensions)) {
slouken@1952
   348
        _this->gl_data->glXSwapIntervalMESA =
icculus@5572
   349
            (int(*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalMESA");
slouken@1952
   350
        _this->gl_data->glXGetSwapIntervalMESA =
icculus@5572
   351
            (int(*)(void)) X11_GL_GetProcAddress(_this,
slouken@1952
   352
                                                   "glXGetSwapIntervalMESA");
slouken@1952
   353
    }
slouken@1952
   354
icculus@5572
   355
    /* Check for GLX_SGI_swap_control */
icculus@5572
   356
    if (HasExtension("GLX_SGI_swap_control", extensions)) {
icculus@5572
   357
        _this->gl_data->glXSwapIntervalSGI =
icculus@5572
   358
            (int (*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");
icculus@5572
   359
    }
icculus@5572
   360
icculus@9330
   361
    /* Check for GLX_ARB_create_context */
icculus@9330
   362
    if (HasExtension("GLX_ARB_create_context", extensions)) {
icculus@9330
   363
        _this->gl_data->glXCreateContextAttribsARB =
icculus@9330
   364
            (GLXContext (*)(Display*,GLXFBConfig,GLXContext,Bool,const int *))
icculus@9330
   365
                X11_GL_GetProcAddress(_this, "glXCreateContextAttribsARB");
icculus@9330
   366
        _this->gl_data->glXChooseFBConfig =
icculus@9330
   367
            (GLXFBConfig *(*)(Display *, int, const int *, int *))
icculus@9330
   368
                X11_GL_GetProcAddress(_this, "glXChooseFBConfig");
icculus@9330
   369
    }
icculus@9330
   370
slouken@1952
   371
    /* Check for GLX_EXT_visual_rating */
slouken@1952
   372
    if (HasExtension("GLX_EXT_visual_rating", extensions)) {
slouken@1952
   373
        _this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;
slouken@1952
   374
    }
slouken@1952
   375
mikesart@6570
   376
    /* Check for GLX_EXT_visual_info */
mikesart@6570
   377
    if (HasExtension("GLX_EXT_visual_info", extensions)) {
mikesart@6570
   378
        _this->gl_data->HAS_GLX_EXT_visual_info = SDL_TRUE;
mikesart@6570
   379
    }
gabomdq@7659
   380
    
gabomdq@7659
   381
    /* Check for GLX_EXT_create_context_es2_profile */
gabomdq@7659
   382
    if (HasExtension("GLX_EXT_create_context_es2_profile", extensions)) {
gabomdq@7659
   383
        _this->gl_data->HAS_GLX_EXT_create_context_es2_profile = SDL_TRUE;
gabomdq@7659
   384
    }
mdiluzio@9412
   385
mdiluzio@9412
   386
    /* Check for GLX_ARB_context_flush_control */
mdiluzio@9412
   387
    if (HasExtension("GLX_ARB_context_flush_control", extensions)) {
mdiluzio@9412
   388
        _this->gl_data->HAS_GLX_ARB_context_flush_control = SDL_TRUE;
mdiluzio@9412
   389
    }
slouken@1952
   390
}
slouken@1952
   391
slouken@6296
   392
/* glXChooseVisual and glXChooseFBConfig have some small differences in
slouken@7191
   393
 * the attribute encoding, it can be chosen with the for_FBConfig parameter.
slouken@6296
   394
 */
icculus@9458
   395
static int
slouken@6296
   396
X11_GL_GetAttributes(_THIS, Display * display, int screen, int * attribs, int size, Bool for_FBConfig)
slouken@1952
   397
{
slouken@5395
   398
    int i = 0;
slouken@7191
   399
    const int MAX_ATTRIBUTES = 64;
slouken@1952
   400
slouken@7191
   401
    /* assert buffer is large enough to hold all SDL attributes. */
mikesart@6570
   402
    SDL_assert(size >= MAX_ATTRIBUTES);
slouken@3139
   403
slouken@1952
   404
    /* Setup our GLX attributes according to the gl_config. */
slouken@6296
   405
    if( for_FBConfig ) {
slouken@6296
   406
        attribs[i++] = GLX_RENDER_TYPE;
icculus@7462
   407
        attribs[i++] = GLX_RGBA_BIT;
slouken@6296
   408
    } else {
slouken@6296
   409
        attribs[i++] = GLX_RGBA;
slouken@6296
   410
    }
slouken@1952
   411
    attribs[i++] = GLX_RED_SIZE;
slouken@1952
   412
    attribs[i++] = _this->gl_config.red_size;
slouken@1952
   413
    attribs[i++] = GLX_GREEN_SIZE;
slouken@1952
   414
    attribs[i++] = _this->gl_config.green_size;
slouken@1952
   415
    attribs[i++] = GLX_BLUE_SIZE;
slouken@1952
   416
    attribs[i++] = _this->gl_config.blue_size;
slouken@1952
   417
slouken@1952
   418
    if (_this->gl_config.alpha_size) {
slouken@1952
   419
        attribs[i++] = GLX_ALPHA_SIZE;
slouken@1952
   420
        attribs[i++] = _this->gl_config.alpha_size;
slouken@1952
   421
    }
slouken@1952
   422
slouken@1952
   423
    if (_this->gl_config.double_buffer) {
slouken@1952
   424
        attribs[i++] = GLX_DOUBLEBUFFER;
icculus@7462
   425
        if( for_FBConfig ) {
icculus@7462
   426
            attribs[i++] = True;
icculus@7462
   427
        }
slouken@1952
   428
    }
slouken@1952
   429
slouken@1952
   430
    attribs[i++] = GLX_DEPTH_SIZE;
slouken@1952
   431
    attribs[i++] = _this->gl_config.depth_size;
slouken@1952
   432
slouken@1952
   433
    if (_this->gl_config.stencil_size) {
slouken@1952
   434
        attribs[i++] = GLX_STENCIL_SIZE;
slouken@1952
   435
        attribs[i++] = _this->gl_config.stencil_size;
slouken@1952
   436
    }
slouken@1952
   437
slouken@1952
   438
    if (_this->gl_config.accum_red_size) {
slouken@1952
   439
        attribs[i++] = GLX_ACCUM_RED_SIZE;
slouken@1952
   440
        attribs[i++] = _this->gl_config.accum_red_size;
slouken@1952
   441
    }
slouken@1952
   442
slouken@1952
   443
    if (_this->gl_config.accum_green_size) {
slouken@1952
   444
        attribs[i++] = GLX_ACCUM_GREEN_SIZE;
slouken@1952
   445
        attribs[i++] = _this->gl_config.accum_green_size;
slouken@1952
   446
    }
slouken@1952
   447
slouken@1952
   448
    if (_this->gl_config.accum_blue_size) {
slouken@1952
   449
        attribs[i++] = GLX_ACCUM_BLUE_SIZE;
slouken@1952
   450
        attribs[i++] = _this->gl_config.accum_blue_size;
slouken@1952
   451
    }
slouken@1952
   452
slouken@1952
   453
    if (_this->gl_config.accum_alpha_size) {
slouken@1952
   454
        attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
slouken@1952
   455
        attribs[i++] = _this->gl_config.accum_alpha_size;
slouken@1952
   456
    }
slouken@1952
   457
slouken@1952
   458
    if (_this->gl_config.stereo) {
slouken@1952
   459
        attribs[i++] = GLX_STEREO;
icculus@7462
   460
        if( for_FBConfig ) {
icculus@7462
   461
            attribs[i++] = True;
icculus@7462
   462
        }
slouken@1952
   463
    }
slouken@1952
   464
slouken@1952
   465
    if (_this->gl_config.multisamplebuffers) {
slouken@1952
   466
        attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
slouken@1952
   467
        attribs[i++] = _this->gl_config.multisamplebuffers;
slouken@1952
   468
    }
slouken@1952
   469
slouken@1952
   470
    if (_this->gl_config.multisamplesamples) {
slouken@1952
   471
        attribs[i++] = GLX_SAMPLES_ARB;
slouken@1952
   472
        attribs[i++] = _this->gl_config.multisamplesamples;
slouken@1952
   473
    }
slouken@1952
   474
icculus@7853
   475
    if (_this->gl_config.framebuffer_srgb_capable) {
icculus@7853
   476
        attribs[i++] = GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB;
icculus@9459
   477
        attribs[i++] = True;  /* always needed, for_FBConfig or not! */
icculus@7853
   478
    }
icculus@7853
   479
slouken@3571
   480
    if (_this->gl_config.accelerated >= 0 &&
slouken@3571
   481
        _this->gl_data->HAS_GLX_EXT_visual_rating) {
slouken@1952
   482
        attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
slouken@3570
   483
        attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
slouken@3570
   484
                                                      GLX_SLOW_VISUAL_EXT;
slouken@1952
   485
    }
slouken@3570
   486
icculus@6817
   487
    /* If we're supposed to use DirectColor visuals, and we've got the
icculus@6817
   488
       EXT_visual_info extension, then add GLX_X_VISUAL_TYPE_EXT. */
mikesart@6570
   489
    if (X11_UseDirectColorVisuals() &&
mikesart@6570
   490
        _this->gl_data->HAS_GLX_EXT_visual_info) {
mikesart@6570
   491
        attribs[i++] = GLX_X_VISUAL_TYPE_EXT;
mikesart@6570
   492
        attribs[i++] = GLX_DIRECT_COLOR_EXT;
mikesart@6570
   493
    }
mikesart@6570
   494
slouken@1952
   495
    attribs[i++] = None;
mikesart@6570
   496
mikesart@6570
   497
    SDL_assert(i <= MAX_ATTRIBUTES);
slouken@7191
   498
slouken@5395
   499
    return i;
slouken@5395
   500
}
slouken@5395
   501
slouken@5395
   502
XVisualInfo *
slouken@5395
   503
X11_GL_GetVisual(_THIS, Display * display, int screen)
slouken@5395
   504
{
slouken@5395
   505
    /* 64 seems nice. */
slouken@6296
   506
    int attribs[64];
slouken@8780
   507
    XVisualInfo *vinfo;
slouken@1952
   508
slouken@6181
   509
    if (!_this->gl_data) {
slouken@6181
   510
        /* The OpenGL library wasn't loaded, SDL_GetError() should have info */
slouken@6181
   511
        return NULL;
slouken@6181
   512
    }
slouken@6181
   513
slouken@8780
   514
    X11_GL_GetAttributes(_this, display, screen, attribs, 64, SDL_FALSE);
slouken@1952
   515
    vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
slouken@1952
   516
    if (!vinfo) {
slouken@1952
   517
        SDL_SetError("Couldn't find matching GLX visual");
slouken@1952
   518
    }
slouken@1952
   519
    return vinfo;
slouken@1952
   520
}
slouken@1952
   521
slouken@6988
   522
#ifndef GLXBadContext
slouken@6988
   523
#define GLXBadContext 0
slouken@6988
   524
#endif
slouken@6988
   525
#ifndef GLXBadFBConfig
slouken@6988
   526
#define GLXBadFBConfig 9
slouken@6988
   527
#endif
slouken@6988
   528
#ifndef GLXBadProfileARB
slouken@6988
   529
#define GLXBadProfileARB 13
slouken@6988
   530
#endif
slouken@6988
   531
static int (*handler) (Display *, XErrorEvent *) = NULL;
icculus@9812
   532
static const char *errorHandlerOperation = NULL;
slouken@7512
   533
static int errorBase = 0;
jorgen@8804
   534
static int errorCode = 0;
slouken@6988
   535
static int
icculus@9812
   536
X11_GL_ErrorHandler(Display * d, XErrorEvent * e)
slouken@6988
   537
{
jorgen@8804
   538
    char *x11_error = NULL;
jorgen@8804
   539
    char x11_error_locale[256];
jorgen@8804
   540
jorgen@8804
   541
    errorCode = e->error_code;
jorgen@8804
   542
    if (X11_XGetErrorText(d, errorCode, x11_error_locale, sizeof(x11_error_locale)) == Success)
jorgen@8804
   543
    {
slouken@8967
   544
        x11_error = SDL_iconv_string("UTF-8", "", x11_error_locale, SDL_strlen(x11_error_locale)+1);
slouken@6988
   545
    }
jorgen@8804
   546
jorgen@8804
   547
    if (x11_error)
jorgen@8804
   548
    {
icculus@9812
   549
        SDL_SetError("Could not %s: %s", errorHandlerOperation, x11_error);
jorgen@8804
   550
        SDL_free(x11_error);
jorgen@8804
   551
    }
jorgen@8804
   552
    else
jorgen@8804
   553
    {
icculus@9812
   554
        SDL_SetError("Could not %s: %i (Base %i)\n", errorHandlerOperation, errorCode, errorBase);
jorgen@8804
   555
    }
jorgen@8804
   556
jorgen@8804
   557
    return (0);
slouken@6988
   558
}
slouken@6988
   559
slouken@1952
   560
SDL_GLContext
slouken@1952
   561
X11_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1952
   562
{
slouken@1952
   563
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   564
    Display *display = data->videodata->display;
slouken@1952
   565
    int screen =
slouken@5246
   566
        ((SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata)->screen;
slouken@1952
   567
    XWindowAttributes xattr;
slouken@1952
   568
    XVisualInfo v, *vinfo;
slouken@1952
   569
    int n;
slouken@6393
   570
    GLXContext context = NULL, share_context;
slouken@6393
   571
slouken@6393
   572
    if (_this->gl_config.share_with_current_context) {
slouken@7413
   573
        share_context = (GLXContext)SDL_GL_GetCurrentContext();
slouken@6393
   574
    } else {
slouken@6393
   575
        share_context = NULL;
slouken@6393
   576
    }
slouken@1952
   577
slouken@1955
   578
    /* We do this to create a clean separation between X and GLX errors. */
icculus@7827
   579
    X11_XSync(display, False);
icculus@9812
   580
    errorHandlerOperation = "create GL context";
slouken@7512
   581
    errorBase = _this->gl_data->errorBase;
jorgen@8804
   582
    errorCode = Success;
icculus@9812
   583
    handler = X11_XSetErrorHandler(X11_GL_ErrorHandler);
icculus@7827
   584
    X11_XGetWindowAttributes(display, data->xwindow, &xattr);
slouken@1952
   585
    v.screen = screen;
icculus@7827
   586
    v.visualid = X11_XVisualIDFromVisual(xattr.visual);
icculus@7827
   587
    vinfo = X11_XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);
slouken@1952
   588
    if (vinfo) {
slouken@6393
   589
        if (_this->gl_config.major_version < 3 &&
slouken@6393
   590
            _this->gl_config.profile_mask == 0 &&
slouken@6393
   591
            _this->gl_config.flags == 0) {
slouken@6393
   592
            /* Create legacy context */
slouken@3100
   593
            context =
slouken@6393
   594
                _this->gl_data->glXCreateContext(display, vinfo, share_context, True);
slouken@3100
   595
        } else {
mdiluzio@9412
   596
            /* max 10 attributes plus terminator */
mdiluzio@9412
   597
            int attribs[11] = {
icculus@9330
   598
                GLX_CONTEXT_MAJOR_VERSION_ARB,
icculus@9330
   599
                _this->gl_config.major_version,
icculus@9330
   600
                GLX_CONTEXT_MINOR_VERSION_ARB,
icculus@9330
   601
                _this->gl_config.minor_version,
icculus@9330
   602
                0
icculus@9330
   603
            };
icculus@9330
   604
            int iattr = 4;
slouken@6296
   605
icculus@9330
   606
            /* SDL profile bits match GLX profile bits */
icculus@9330
   607
            if( _this->gl_config.profile_mask != 0 ) {
icculus@9330
   608
                attribs[iattr++] = GLX_CONTEXT_PROFILE_MASK_ARB;
icculus@9330
   609
                attribs[iattr++] = _this->gl_config.profile_mask;
icculus@9330
   610
            }
slouken@6296
   611
icculus@9330
   612
            /* SDL flags match GLX flags */
icculus@9330
   613
            if( _this->gl_config.flags != 0 ) {
icculus@9330
   614
                attribs[iattr++] = GLX_CONTEXT_FLAGS_ARB;
icculus@9330
   615
                attribs[iattr++] = _this->gl_config.flags;
icculus@9330
   616
            }
slouken@6296
   617
mdiluzio@9412
   618
            /* only set if glx extension is available */
mdiluzio@9412
   619
            if( _this->gl_data->HAS_GLX_ARB_context_flush_control ) {
mdiluzio@9412
   620
                attribs[iattr++] = GLX_CONTEXT_RELEASE_BEHAVIOR_ARB;
mdiluzio@9412
   621
                attribs[iattr++] = 
mdiluzio@9412
   622
                    _this->gl_config.release_behavior ? 
mdiluzio@9412
   623
                    GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB : 
mdiluzio@9412
   624
                    GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB;
mdiluzio@9412
   625
            }
mdiluzio@9412
   626
icculus@9330
   627
            attribs[iattr++] = 0;
slouken@3139
   628
icculus@9330
   629
            /* Get a pointer to the context creation function for GL 3.0 */
icculus@9330
   630
            if (!_this->gl_data->glXCreateContextAttribsARB) {
icculus@9330
   631
                SDL_SetError("OpenGL 3.0 and later are not supported by this system");
icculus@9330
   632
            } else {
icculus@9330
   633
                int glxAttribs[64];
icculus@9330
   634
icculus@9330
   635
                /* Create a GL 3.x context */
icculus@9330
   636
                GLXFBConfig *framebuffer_config = NULL;
icculus@9330
   637
                int fbcount = 0;
icculus@9330
   638
icculus@9330
   639
                X11_GL_GetAttributes(_this,display,screen,glxAttribs,64,SDL_TRUE);
icculus@9330
   640
icculus@9330
   641
                if (!_this->gl_data->glXChooseFBConfig
icculus@9330
   642
                    || !(framebuffer_config =
icculus@9330
   643
                        _this->gl_data->glXChooseFBConfig(display,
icculus@9330
   644
                                          DefaultScreen(display), glxAttribs,
icculus@9330
   645
                                          &fbcount))) {
icculus@9330
   646
                    SDL_SetError("No good framebuffers found. OpenGL 3.0 and later unavailable");
slouken@3100
   647
                } else {
icculus@9330
   648
                    context = _this->gl_data->glXCreateContextAttribsARB(display,
slouken@3139
   649
                                                    framebuffer_config[0],
slouken@6393
   650
                                                    share_context, True, attribs);
slouken@10568
   651
                    X11_XFree(framebuffer_config);
slouken@3100
   652
                }
slouken@3100
   653
            }
slouken@3100
   654
        }
icculus@7827
   655
        X11_XFree(vinfo);
slouken@1952
   656
    }
icculus@7827
   657
    X11_XSync(display, False);
icculus@7827
   658
    X11_XSetErrorHandler(handler);
slouken@7191
   659
slouken@1952
   660
    if (!context) {
jorgen@8804
   661
        if (errorCode == Success) {
jorgen@8804
   662
            SDL_SetError("Could not create GL context");
jorgen@8804
   663
        }
slouken@2178
   664
        return NULL;
slouken@1952
   665
    }
slouken@2178
   666
slouken@2178
   667
    if (X11_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   668
        X11_GL_DeleteContext(_this, context);
slouken@2178
   669
        return NULL;
slouken@2178
   670
    }
slouken@2178
   671
slouken@2178
   672
    return context;
slouken@1952
   673
}
slouken@1952
   674
slouken@1952
   675
int
slouken@1952
   676
X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1952
   677
{
slouken@1952
   678
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   679
    Window drawable =
urkle@6794
   680
        (context ? ((SDL_WindowData *) window->driverdata)->xwindow : None);
slouken@1952
   681
    GLXContext glx_context = (GLXContext) context;
icculus@9812
   682
    int rc;
slouken@1952
   683
slouken@6522
   684
    if (!_this->gl_data) {
icculus@7037
   685
        return SDL_SetError("OpenGL not initialized");
slouken@6522
   686
    }
slouken@6522
   687
icculus@9812
   688
    /* We do this to create a clean separation between X and GLX errors. */
icculus@9812
   689
    X11_XSync(display, False);
icculus@9812
   690
    errorHandlerOperation = "make GL context current";
icculus@9812
   691
    errorBase = _this->gl_data->errorBase;
icculus@9812
   692
    errorCode = Success;
icculus@9812
   693
    handler = X11_XSetErrorHandler(X11_GL_ErrorHandler);
icculus@9812
   694
    rc = _this->gl_data->glXMakeCurrent(display, drawable, glx_context);
icculus@9812
   695
    X11_XSetErrorHandler(handler);
icculus@9812
   696
icculus@9812
   697
    if (errorCode != Success) {   /* uhoh, an X error was thrown! */
icculus@9812
   698
        return -1;  /* the error handler called SDL_SetError() already. */
philipp@10173
   699
    } else if (!rc) {  /* glXMakeCurrent() failed without throwing an X error */
icculus@7037
   700
        return SDL_SetError("Unable to make GL context current");
slouken@1952
   701
    }
slouken@1952
   702
icculus@7037
   703
    return 0;
slouken@1952
   704
}
slouken@1952
   705
slouken@7191
   706
/*
philipp@10173
   707
   0 is a valid argument to glXSwapInterval(MESA|EXT) and setting it to 0
icculus@5572
   708
   will undo the effect of a previous call with a value that is greater
icculus@5572
   709
   than zero (or at least that is what the docs say). OTOH, 0 is an invalid
philipp@10173
   710
   argument to glXSwapIntervalSGI and it returns an error if you call it
icculus@5572
   711
   with 0 as an argument.
bob@2327
   712
*/
bob@2327
   713
philipp@10170
   714
static int swapinterval = 0;
slouken@1952
   715
int
slouken@1952
   716
X11_GL_SetSwapInterval(_THIS, int interval)
slouken@1952
   717
{
icculus@6382
   718
    int status = -1;
slouken@1952
   719
icculus@6382
   720
    if ((interval < 0) && (!_this->gl_data->HAS_GLX_EXT_swap_control_tear)) {
icculus@6382
   721
        SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   722
    } else if (_this->gl_data->glXSwapIntervalEXT) {
icculus@5572
   723
        Display *display = ((SDL_VideoData *) _this->driverdata)->display;
icculus@5572
   724
        const SDL_WindowData *windowdata = (SDL_WindowData *)
slouken@7412
   725
            SDL_GL_GetCurrentWindow()->driverdata;
slouken@6846
   726
icculus@5572
   727
        Window drawable = windowdata->xwindow;
slouken@6846
   728
slouken@6846
   729
        /*
slouken@6846
   730
         * This is a workaround for a bug in NVIDIA drivers. Bug has been reported
slouken@6846
   731
         * and will be fixed in a future release (probably 319.xx).
slouken@6846
   732
         *
slouken@6846
   733
         * There's a bug where glXSetSwapIntervalEXT ignores updates because
slouken@6846
   734
         * it has the wrong value cached. To work around it, we just run a no-op
slouken@6846
   735
         * update to the current value.
slouken@6846
   736
         */
slouken@6851
   737
        int currentInterval = X11_GL_GetSwapInterval(_this);
slouken@6846
   738
        _this->gl_data->glXSwapIntervalEXT(display, drawable, currentInterval);
slouken@6846
   739
        _this->gl_data->glXSwapIntervalEXT(display, drawable, interval);
slouken@6846
   740
slouken@6846
   741
        status = 0;
slouken@6846
   742
        swapinterval = interval;
icculus@5572
   743
    } else if (_this->gl_data->glXSwapIntervalMESA) {
slouken@1952
   744
        status = _this->gl_data->glXSwapIntervalMESA(interval);
slouken@1952
   745
        if (status != 0) {
philipp@10173
   746
            SDL_SetError("glXSwapIntervalMESA failed");
bob@2327
   747
        } else {
bob@2327
   748
            swapinterval = interval;
slouken@1952
   749
        }
slouken@1952
   750
    } else if (_this->gl_data->glXSwapIntervalSGI) {
slouken@1952
   751
        status = _this->gl_data->glXSwapIntervalSGI(interval);
slouken@1952
   752
        if (status != 0) {
philipp@10173
   753
            SDL_SetError("glXSwapIntervalSGI failed");
bob@2327
   754
        } else {
bob@2327
   755
            swapinterval = interval;
slouken@1952
   756
        }
slouken@1952
   757
    } else {
slouken@1952
   758
        SDL_Unsupported();
slouken@1952
   759
    }
slouken@1952
   760
    return status;
slouken@1952
   761
}
slouken@1952
   762
slouken@1952
   763
int
slouken@1952
   764
X11_GL_GetSwapInterval(_THIS)
slouken@1952
   765
{
icculus@5572
   766
    if (_this->gl_data->glXSwapIntervalEXT) {
icculus@5572
   767
        Display *display = ((SDL_VideoData *) _this->driverdata)->display;
icculus@5572
   768
        const SDL_WindowData *windowdata = (SDL_WindowData *)
slouken@7412
   769
            SDL_GL_GetCurrentWindow()->driverdata;
icculus@5572
   770
        Window drawable = windowdata->xwindow;
icculus@6382
   771
        unsigned int allow_late_swap_tearing = 0;
icculus@6382
   772
        unsigned int interval = 0;
icculus@6382
   773
icculus@6382
   774
        if (_this->gl_data->HAS_GLX_EXT_swap_control_tear) {
icculus@6382
   775
            _this->gl_data->glXQueryDrawable(display, drawable,
icculus@6382
   776
                                            GLX_LATE_SWAPS_TEAR_EXT,
icculus@6382
   777
                                            &allow_late_swap_tearing);
icculus@6382
   778
        }
icculus@6382
   779
icculus@5572
   780
        _this->gl_data->glXQueryDrawable(display, drawable,
icculus@6382
   781
                                         GLX_SWAP_INTERVAL_EXT, &interval);
icculus@6382
   782
icculus@6382
   783
        if ((allow_late_swap_tearing) && (interval > 0)) {
icculus@6382
   784
            return -((int) interval);
icculus@6382
   785
        }
icculus@6382
   786
icculus@6382
   787
        return (int) interval;
icculus@5572
   788
    } else if (_this->gl_data->glXGetSwapIntervalMESA) {
slouken@1952
   789
        return _this->gl_data->glXGetSwapIntervalMESA();
slouken@1952
   790
    } else {
bob@2327
   791
        return swapinterval;
slouken@1952
   792
    }
slouken@1952
   793
}
slouken@1952
   794
slouken@1952
   795
void
slouken@1952
   796
X11_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1952
   797
{
slouken@1952
   798
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   799
    Display *display = data->videodata->display;
slouken@1952
   800
slouken@3685
   801
    _this->gl_data->glXSwapBuffers(display, data->xwindow);
slouken@1952
   802
}
slouken@1952
   803
slouken@1952
   804
void
slouken@1952
   805
X11_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1952
   806
{
slouken@1952
   807
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   808
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   809
slouken@6522
   810
    if (!_this->gl_data) {
slouken@6522
   811
        return;
slouken@6522
   812
    }
slouken@1952
   813
    _this->gl_data->glXDestroyContext(display, glx_context);
icculus@7827
   814
    X11_XSync(display, False);
slouken@1952
   815
}
slouken@1952
   816
slouken@1952
   817
#endif /* SDL_VIDEO_OPENGL_GLX */
slouken@1952
   818
slouken@6044
   819
#endif /* SDL_VIDEO_DRIVER_X11 */
slouken@6044
   820
slouken@1952
   821
/* vi: set ts=4 sw=4 expandtab: */