src/video/x11/SDL_x11opengl.c
author Ryan C. Gordon <icculus@icculus.org>
Mon, 02 Feb 2015 01:05:41 -0500
changeset 9330 26eb20aad02f
parent 8967 8ca9ce569f65
child 9354 5709598d628a
permissions -rw-r--r--
X11: Fixes for OpenGL 3.0 and later context creation.

- Don't create a temporary context first; this was probably due to Windows
needing one to get the address of wglCreateContextAttribsARB(), but that's
a unique quirk of WGL, and doesn't apply to glX. The glX spec explicitly says
you have to get a function pointer that works with any context from
glXGetProcAddress(), including when no context exists.

- Properly check for the GLX_ARB_create_context instead of just looking for a
non-NULL glXCreateContextAttribsARB()...some implementations, like Mesa,
never return NULL for function lookups (Mesa returns pointers into a jump
table that is filled out when the GL is initialized; since you can look up
functions before you have a valid context, it can't definitely say a function
isn't valid at that point).
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 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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#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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    /* 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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        X11_XCreateColormap(display, RootWindow(display, screen), vinfo->visual,
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                        AllocNone);
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    w = X11_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) {
slouken@1952
   337
        _this->gl_data->glXMakeCurrent(display, w, context);
slouken@1952
   338
    }
icculus@7827
   339
    X11_XFree(vinfo);
slouken@1952
   340
slouken@1952
   341
    glXQueryExtensionsStringFunc =
slouken@1952
   342
        (const char *(*)(Display *, int)) X11_GL_GetProcAddress(_this,
slouken@1952
   343
                                                                "glXQueryExtensionsString");
slouken@1952
   344
    if (glXQueryExtensionsStringFunc) {
slouken@1952
   345
        extensions = glXQueryExtensionsStringFunc(display, screen);
slouken@1952
   346
    } else {
slouken@1952
   347
        extensions = NULL;
slouken@1952
   348
    }
slouken@1952
   349
icculus@6382
   350
    /* Check for GLX_EXT_swap_control(_tear) */
icculus@6382
   351
    _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_FALSE;
icculus@5572
   352
    if (HasExtension("GLX_EXT_swap_control", extensions)) {
icculus@5572
   353
        _this->gl_data->glXSwapIntervalEXT =
slouken@6846
   354
            (void (*)(Display*,GLXDrawable,int))
icculus@5572
   355
                X11_GL_GetProcAddress(_this, "glXSwapIntervalEXT");
icculus@6382
   356
        if (HasExtension("GLX_EXT_swap_control_tear", extensions)) {
icculus@6382
   357
            _this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_TRUE;
icculus@6382
   358
        }
slouken@1952
   359
    }
slouken@1952
   360
slouken@1952
   361
    /* Check for GLX_MESA_swap_control */
slouken@1952
   362
    if (HasExtension("GLX_MESA_swap_control", extensions)) {
slouken@1952
   363
        _this->gl_data->glXSwapIntervalMESA =
icculus@5572
   364
            (int(*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalMESA");
slouken@1952
   365
        _this->gl_data->glXGetSwapIntervalMESA =
icculus@5572
   366
            (int(*)(void)) X11_GL_GetProcAddress(_this,
slouken@1952
   367
                                                   "glXGetSwapIntervalMESA");
slouken@1952
   368
    }
slouken@1952
   369
icculus@5572
   370
    /* Check for GLX_SGI_swap_control */
icculus@5572
   371
    if (HasExtension("GLX_SGI_swap_control", extensions)) {
icculus@5572
   372
        _this->gl_data->glXSwapIntervalSGI =
icculus@5572
   373
            (int (*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");
icculus@5572
   374
    }
icculus@5572
   375
icculus@9330
   376
    /* Check for GLX_ARB_create_context */
icculus@9330
   377
    if (HasExtension("GLX_ARB_create_context", extensions)) {
icculus@9330
   378
        _this->gl_data->glXCreateContextAttribsARB =
icculus@9330
   379
            (GLXContext (*)(Display*,GLXFBConfig,GLXContext,Bool,const int *))
icculus@9330
   380
                X11_GL_GetProcAddress(_this, "glXCreateContextAttribsARB");
icculus@9330
   381
        _this->gl_data->glXChooseFBConfig =
icculus@9330
   382
            (GLXFBConfig *(*)(Display *, int, const int *, int *))
icculus@9330
   383
                X11_GL_GetProcAddress(_this, "glXChooseFBConfig");
icculus@9330
   384
    }
icculus@9330
   385
slouken@1952
   386
    /* Check for GLX_EXT_visual_rating */
slouken@1952
   387
    if (HasExtension("GLX_EXT_visual_rating", extensions)) {
slouken@1952
   388
        _this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;
slouken@1952
   389
    }
slouken@1952
   390
mikesart@6570
   391
    /* Check for GLX_EXT_visual_info */
mikesart@6570
   392
    if (HasExtension("GLX_EXT_visual_info", extensions)) {
mikesart@6570
   393
        _this->gl_data->HAS_GLX_EXT_visual_info = SDL_TRUE;
mikesart@6570
   394
    }
gabomdq@7659
   395
    
gabomdq@7659
   396
    /* Check for GLX_EXT_create_context_es2_profile */
gabomdq@7659
   397
    if (HasExtension("GLX_EXT_create_context_es2_profile", extensions)) {
gabomdq@7659
   398
        _this->gl_data->HAS_GLX_EXT_create_context_es2_profile = SDL_TRUE;
gabomdq@7659
   399
    }
mikesart@6570
   400
slouken@1952
   401
    if (context) {
slouken@1952
   402
        _this->gl_data->glXMakeCurrent(display, None, NULL);
slouken@1952
   403
        _this->gl_data->glXDestroyContext(display, context);
slouken@1952
   404
    }
icculus@7827
   405
    X11_XDestroyWindow(display, w);
bob@2323
   406
    X11_PumpEvents(_this);
slouken@1952
   407
}
slouken@1952
   408
slouken@6296
   409
/* glXChooseVisual and glXChooseFBConfig have some small differences in
slouken@7191
   410
 * the attribute encoding, it can be chosen with the for_FBConfig parameter.
slouken@6296
   411
 */
slouken@7191
   412
int
slouken@6296
   413
X11_GL_GetAttributes(_THIS, Display * display, int screen, int * attribs, int size, Bool for_FBConfig)
slouken@1952
   414
{
slouken@5395
   415
    int i = 0;
slouken@7191
   416
    const int MAX_ATTRIBUTES = 64;
slouken@1952
   417
slouken@7191
   418
    /* assert buffer is large enough to hold all SDL attributes. */
mikesart@6570
   419
    SDL_assert(size >= MAX_ATTRIBUTES);
slouken@3139
   420
slouken@1952
   421
    /* Setup our GLX attributes according to the gl_config. */
slouken@6296
   422
    if( for_FBConfig ) {
slouken@6296
   423
        attribs[i++] = GLX_RENDER_TYPE;
icculus@7462
   424
        attribs[i++] = GLX_RGBA_BIT;
slouken@6296
   425
    } else {
slouken@6296
   426
        attribs[i++] = GLX_RGBA;
slouken@6296
   427
    }
slouken@1952
   428
    attribs[i++] = GLX_RED_SIZE;
slouken@1952
   429
    attribs[i++] = _this->gl_config.red_size;
slouken@1952
   430
    attribs[i++] = GLX_GREEN_SIZE;
slouken@1952
   431
    attribs[i++] = _this->gl_config.green_size;
slouken@1952
   432
    attribs[i++] = GLX_BLUE_SIZE;
slouken@1952
   433
    attribs[i++] = _this->gl_config.blue_size;
slouken@1952
   434
slouken@1952
   435
    if (_this->gl_config.alpha_size) {
slouken@1952
   436
        attribs[i++] = GLX_ALPHA_SIZE;
slouken@1952
   437
        attribs[i++] = _this->gl_config.alpha_size;
slouken@1952
   438
    }
slouken@1952
   439
slouken@1952
   440
    if (_this->gl_config.double_buffer) {
slouken@1952
   441
        attribs[i++] = GLX_DOUBLEBUFFER;
icculus@7462
   442
        if( for_FBConfig ) {
icculus@7462
   443
            attribs[i++] = True;
icculus@7462
   444
        }
slouken@1952
   445
    }
slouken@1952
   446
slouken@1952
   447
    attribs[i++] = GLX_DEPTH_SIZE;
slouken@1952
   448
    attribs[i++] = _this->gl_config.depth_size;
slouken@1952
   449
slouken@1952
   450
    if (_this->gl_config.stencil_size) {
slouken@1952
   451
        attribs[i++] = GLX_STENCIL_SIZE;
slouken@1952
   452
        attribs[i++] = _this->gl_config.stencil_size;
slouken@1952
   453
    }
slouken@1952
   454
slouken@1952
   455
    if (_this->gl_config.accum_red_size) {
slouken@1952
   456
        attribs[i++] = GLX_ACCUM_RED_SIZE;
slouken@1952
   457
        attribs[i++] = _this->gl_config.accum_red_size;
slouken@1952
   458
    }
slouken@1952
   459
slouken@1952
   460
    if (_this->gl_config.accum_green_size) {
slouken@1952
   461
        attribs[i++] = GLX_ACCUM_GREEN_SIZE;
slouken@1952
   462
        attribs[i++] = _this->gl_config.accum_green_size;
slouken@1952
   463
    }
slouken@1952
   464
slouken@1952
   465
    if (_this->gl_config.accum_blue_size) {
slouken@1952
   466
        attribs[i++] = GLX_ACCUM_BLUE_SIZE;
slouken@1952
   467
        attribs[i++] = _this->gl_config.accum_blue_size;
slouken@1952
   468
    }
slouken@1952
   469
slouken@1952
   470
    if (_this->gl_config.accum_alpha_size) {
slouken@1952
   471
        attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
slouken@1952
   472
        attribs[i++] = _this->gl_config.accum_alpha_size;
slouken@1952
   473
    }
slouken@1952
   474
slouken@1952
   475
    if (_this->gl_config.stereo) {
slouken@1952
   476
        attribs[i++] = GLX_STEREO;
icculus@7462
   477
        if( for_FBConfig ) {
icculus@7462
   478
            attribs[i++] = True;
icculus@7462
   479
        }
slouken@1952
   480
    }
slouken@1952
   481
slouken@1952
   482
    if (_this->gl_config.multisamplebuffers) {
slouken@1952
   483
        attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
slouken@1952
   484
        attribs[i++] = _this->gl_config.multisamplebuffers;
slouken@1952
   485
    }
slouken@1952
   486
slouken@1952
   487
    if (_this->gl_config.multisamplesamples) {
slouken@1952
   488
        attribs[i++] = GLX_SAMPLES_ARB;
slouken@1952
   489
        attribs[i++] = _this->gl_config.multisamplesamples;
slouken@1952
   490
    }
slouken@1952
   491
icculus@7853
   492
    if (_this->gl_config.framebuffer_srgb_capable) {
icculus@7853
   493
        attribs[i++] = GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB;
icculus@7853
   494
        if( for_FBConfig ) {
icculus@7853
   495
            attribs[i++] = True;
icculus@7853
   496
        }
icculus@7853
   497
    }
icculus@7853
   498
slouken@3571
   499
    if (_this->gl_config.accelerated >= 0 &&
slouken@3571
   500
        _this->gl_data->HAS_GLX_EXT_visual_rating) {
slouken@1952
   501
        attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
slouken@3570
   502
        attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
slouken@3570
   503
                                                      GLX_SLOW_VISUAL_EXT;
slouken@1952
   504
    }
slouken@3570
   505
icculus@6817
   506
    /* If we're supposed to use DirectColor visuals, and we've got the
icculus@6817
   507
       EXT_visual_info extension, then add GLX_X_VISUAL_TYPE_EXT. */
mikesart@6570
   508
    if (X11_UseDirectColorVisuals() &&
mikesart@6570
   509
        _this->gl_data->HAS_GLX_EXT_visual_info) {
mikesart@6570
   510
        attribs[i++] = GLX_X_VISUAL_TYPE_EXT;
mikesart@6570
   511
        attribs[i++] = GLX_DIRECT_COLOR_EXT;
mikesart@6570
   512
    }
mikesart@6570
   513
slouken@1952
   514
    attribs[i++] = None;
mikesart@6570
   515
mikesart@6570
   516
    SDL_assert(i <= MAX_ATTRIBUTES);
slouken@7191
   517
slouken@5395
   518
    return i;
slouken@5395
   519
}
slouken@5395
   520
slouken@5395
   521
XVisualInfo *
slouken@5395
   522
X11_GL_GetVisual(_THIS, Display * display, int screen)
slouken@5395
   523
{
slouken@5395
   524
    /* 64 seems nice. */
slouken@6296
   525
    int attribs[64];
slouken@8780
   526
    XVisualInfo *vinfo;
slouken@1952
   527
slouken@6181
   528
    if (!_this->gl_data) {
slouken@6181
   529
        /* The OpenGL library wasn't loaded, SDL_GetError() should have info */
slouken@6181
   530
        return NULL;
slouken@6181
   531
    }
slouken@6181
   532
slouken@8780
   533
    X11_GL_GetAttributes(_this, display, screen, attribs, 64, SDL_FALSE);
slouken@1952
   534
    vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
slouken@1952
   535
    if (!vinfo) {
slouken@1952
   536
        SDL_SetError("Couldn't find matching GLX visual");
slouken@1952
   537
    }
slouken@1952
   538
    return vinfo;
slouken@1952
   539
}
slouken@1952
   540
slouken@6988
   541
#ifndef GLXBadContext
slouken@6988
   542
#define GLXBadContext 0
slouken@6988
   543
#endif
slouken@6988
   544
#ifndef GLXBadFBConfig
slouken@6988
   545
#define GLXBadFBConfig 9
slouken@6988
   546
#endif
slouken@6988
   547
#ifndef GLXBadProfileARB
slouken@6988
   548
#define GLXBadProfileARB 13
slouken@6988
   549
#endif
slouken@6988
   550
static int (*handler) (Display *, XErrorEvent *) = NULL;
slouken@7512
   551
static int errorBase = 0;
jorgen@8804
   552
static int errorCode = 0;
slouken@6988
   553
static int
slouken@6988
   554
X11_GL_CreateContextErrorHandler(Display * d, XErrorEvent * e)
slouken@6988
   555
{
jorgen@8804
   556
    char *x11_error = NULL;
jorgen@8804
   557
    char x11_error_locale[256];
jorgen@8804
   558
jorgen@8804
   559
    errorCode = e->error_code;
jorgen@8804
   560
    if (X11_XGetErrorText(d, errorCode, x11_error_locale, sizeof(x11_error_locale)) == Success)
jorgen@8804
   561
    {
slouken@8967
   562
        x11_error = SDL_iconv_string("UTF-8", "", x11_error_locale, SDL_strlen(x11_error_locale)+1);
slouken@6988
   563
    }
jorgen@8804
   564
jorgen@8804
   565
    if (x11_error)
jorgen@8804
   566
    {
jorgen@8804
   567
        SDL_SetError("Could not create GL context: %s", x11_error);
jorgen@8804
   568
        SDL_free(x11_error);
jorgen@8804
   569
    }
jorgen@8804
   570
    else
jorgen@8804
   571
    {
jorgen@8804
   572
        SDL_SetError("Could not create GL context: %i (Base %i)\n", errorCode, errorBase);
jorgen@8804
   573
    }
jorgen@8804
   574
jorgen@8804
   575
    return (0);
slouken@6988
   576
}
slouken@6988
   577
slouken@1952
   578
SDL_GLContext
slouken@1952
   579
X11_GL_CreateContext(_THIS, SDL_Window * window)
slouken@1952
   580
{
slouken@1952
   581
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   582
    Display *display = data->videodata->display;
slouken@1952
   583
    int screen =
slouken@5246
   584
        ((SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata)->screen;
slouken@1952
   585
    XWindowAttributes xattr;
slouken@1952
   586
    XVisualInfo v, *vinfo;
slouken@1952
   587
    int n;
slouken@6393
   588
    GLXContext context = NULL, share_context;
slouken@6393
   589
slouken@6393
   590
    if (_this->gl_config.share_with_current_context) {
slouken@7413
   591
        share_context = (GLXContext)SDL_GL_GetCurrentContext();
slouken@6393
   592
    } else {
slouken@6393
   593
        share_context = NULL;
slouken@6393
   594
    }
slouken@1952
   595
slouken@1955
   596
    /* We do this to create a clean separation between X and GLX errors. */
icculus@7827
   597
    X11_XSync(display, False);
slouken@7512
   598
    errorBase = _this->gl_data->errorBase;
jorgen@8804
   599
    errorCode = Success;
icculus@7827
   600
    handler = X11_XSetErrorHandler(X11_GL_CreateContextErrorHandler);
icculus@7827
   601
    X11_XGetWindowAttributes(display, data->xwindow, &xattr);
slouken@1952
   602
    v.screen = screen;
icculus@7827
   603
    v.visualid = X11_XVisualIDFromVisual(xattr.visual);
icculus@7827
   604
    vinfo = X11_XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);
slouken@1952
   605
    if (vinfo) {
slouken@6393
   606
        if (_this->gl_config.major_version < 3 &&
slouken@6393
   607
            _this->gl_config.profile_mask == 0 &&
slouken@6393
   608
            _this->gl_config.flags == 0) {
slouken@6393
   609
            /* Create legacy context */
slouken@3100
   610
            context =
slouken@6393
   611
                _this->gl_data->glXCreateContext(display, vinfo, share_context, True);
slouken@3100
   612
        } else {
icculus@9330
   613
            /* max 8 attributes plus terminator */
icculus@9330
   614
            int attribs[9] = {
icculus@9330
   615
                GLX_CONTEXT_MAJOR_VERSION_ARB,
icculus@9330
   616
                _this->gl_config.major_version,
icculus@9330
   617
                GLX_CONTEXT_MINOR_VERSION_ARB,
icculus@9330
   618
                _this->gl_config.minor_version,
icculus@9330
   619
                0
icculus@9330
   620
            };
icculus@9330
   621
            int iattr = 4;
slouken@6296
   622
icculus@9330
   623
            /* SDL profile bits match GLX profile bits */
icculus@9330
   624
            if( _this->gl_config.profile_mask != 0 ) {
icculus@9330
   625
                attribs[iattr++] = GLX_CONTEXT_PROFILE_MASK_ARB;
icculus@9330
   626
                attribs[iattr++] = _this->gl_config.profile_mask;
icculus@9330
   627
            }
slouken@6296
   628
icculus@9330
   629
            /* SDL flags match GLX flags */
icculus@9330
   630
            if( _this->gl_config.flags != 0 ) {
icculus@9330
   631
                attribs[iattr++] = GLX_CONTEXT_FLAGS_ARB;
icculus@9330
   632
                attribs[iattr++] = _this->gl_config.flags;
icculus@9330
   633
            }
slouken@6296
   634
icculus@9330
   635
            attribs[iattr++] = 0;
slouken@3139
   636
icculus@9330
   637
            /* Get a pointer to the context creation function for GL 3.0 */
icculus@9330
   638
            if (!_this->gl_data->glXCreateContextAttribsARB) {
icculus@9330
   639
                SDL_SetError("OpenGL 3.0 and later are not supported by this system");
icculus@9330
   640
            } else {
icculus@9330
   641
                int glxAttribs[64];
icculus@9330
   642
icculus@9330
   643
                /* Create a GL 3.x context */
icculus@9330
   644
                GLXFBConfig *framebuffer_config = NULL;
icculus@9330
   645
                int fbcount = 0;
icculus@9330
   646
icculus@9330
   647
                X11_GL_GetAttributes(_this,display,screen,glxAttribs,64,SDL_TRUE);
icculus@9330
   648
icculus@9330
   649
                if (!_this->gl_data->glXChooseFBConfig
icculus@9330
   650
                    || !(framebuffer_config =
icculus@9330
   651
                        _this->gl_data->glXChooseFBConfig(display,
icculus@9330
   652
                                          DefaultScreen(display), glxAttribs,
icculus@9330
   653
                                          &fbcount))) {
icculus@9330
   654
                    SDL_SetError("No good framebuffers found. OpenGL 3.0 and later unavailable");
slouken@3100
   655
                } else {
icculus@9330
   656
                    context = _this->gl_data->glXCreateContextAttribsARB(display,
slouken@3139
   657
                                                    framebuffer_config[0],
slouken@6393
   658
                                                    share_context, True, attribs);
slouken@3100
   659
                }
slouken@3100
   660
            }
slouken@3100
   661
        }
icculus@7827
   662
        X11_XFree(vinfo);
slouken@1952
   663
    }
icculus@7827
   664
    X11_XSync(display, False);
icculus@7827
   665
    X11_XSetErrorHandler(handler);
slouken@7191
   666
slouken@1952
   667
    if (!context) {
jorgen@8804
   668
        if (errorCode == Success) {
jorgen@8804
   669
            SDL_SetError("Could not create GL context");
jorgen@8804
   670
        }
slouken@2178
   671
        return NULL;
slouken@1952
   672
    }
slouken@2178
   673
slouken@2178
   674
    if (X11_GL_MakeCurrent(_this, window, context) < 0) {
slouken@2178
   675
        X11_GL_DeleteContext(_this, context);
slouken@2178
   676
        return NULL;
slouken@2178
   677
    }
slouken@2178
   678
slouken@2178
   679
    return context;
slouken@1952
   680
}
slouken@1952
   681
slouken@1952
   682
int
slouken@1952
   683
X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
slouken@1952
   684
{
slouken@1952
   685
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   686
    Window drawable =
urkle@6794
   687
        (context ? ((SDL_WindowData *) window->driverdata)->xwindow : None);
slouken@1952
   688
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   689
slouken@6522
   690
    if (!_this->gl_data) {
icculus@7037
   691
        return SDL_SetError("OpenGL not initialized");
slouken@6522
   692
    }
slouken@6522
   693
slouken@1952
   694
    if (!_this->gl_data->glXMakeCurrent(display, drawable, glx_context)) {
icculus@7037
   695
        return SDL_SetError("Unable to make GL context current");
slouken@1952
   696
    }
slouken@1952
   697
icculus@7037
   698
    return 0;
slouken@1952
   699
}
slouken@1952
   700
slouken@7191
   701
/*
icculus@5572
   702
   0 is a valid argument to glxSwapInterval(MESA|EXT) and setting it to 0
icculus@5572
   703
   will undo the effect of a previous call with a value that is greater
icculus@5572
   704
   than zero (or at least that is what the docs say). OTOH, 0 is an invalid
icculus@5572
   705
   argument to glxSwapIntervalSGI and it returns an error if you call it
icculus@5572
   706
   with 0 as an argument.
bob@2327
   707
*/
bob@2327
   708
bob@2327
   709
static int swapinterval = -1;
slouken@1952
   710
int
slouken@1952
   711
X11_GL_SetSwapInterval(_THIS, int interval)
slouken@1952
   712
{
icculus@6382
   713
    int status = -1;
slouken@1952
   714
icculus@6382
   715
    if ((interval < 0) && (!_this->gl_data->HAS_GLX_EXT_swap_control_tear)) {
icculus@6382
   716
        SDL_SetError("Negative swap interval unsupported in this GL");
icculus@6382
   717
    } else if (_this->gl_data->glXSwapIntervalEXT) {
icculus@5572
   718
        Display *display = ((SDL_VideoData *) _this->driverdata)->display;
icculus@5572
   719
        const SDL_WindowData *windowdata = (SDL_WindowData *)
slouken@7412
   720
            SDL_GL_GetCurrentWindow()->driverdata;
slouken@6846
   721
icculus@5572
   722
        Window drawable = windowdata->xwindow;
slouken@6846
   723
slouken@6846
   724
        /*
slouken@6846
   725
         * This is a workaround for a bug in NVIDIA drivers. Bug has been reported
slouken@6846
   726
         * and will be fixed in a future release (probably 319.xx).
slouken@6846
   727
         *
slouken@6846
   728
         * There's a bug where glXSetSwapIntervalEXT ignores updates because
slouken@6846
   729
         * it has the wrong value cached. To work around it, we just run a no-op
slouken@6846
   730
         * update to the current value.
slouken@6846
   731
         */
slouken@6851
   732
        int currentInterval = X11_GL_GetSwapInterval(_this);
slouken@6846
   733
        _this->gl_data->glXSwapIntervalEXT(display, drawable, currentInterval);
slouken@6846
   734
        _this->gl_data->glXSwapIntervalEXT(display, drawable, interval);
slouken@6846
   735
slouken@6846
   736
        status = 0;
slouken@6846
   737
        swapinterval = interval;
icculus@5572
   738
    } else if (_this->gl_data->glXSwapIntervalMESA) {
slouken@1952
   739
        status = _this->gl_data->glXSwapIntervalMESA(interval);
slouken@1952
   740
        if (status != 0) {
slouken@1952
   741
            SDL_SetError("glxSwapIntervalMESA failed");
bob@2327
   742
        } else {
bob@2327
   743
            swapinterval = interval;
slouken@1952
   744
        }
slouken@1952
   745
    } else if (_this->gl_data->glXSwapIntervalSGI) {
slouken@1952
   746
        status = _this->gl_data->glXSwapIntervalSGI(interval);
slouken@1952
   747
        if (status != 0) {
slouken@1952
   748
            SDL_SetError("glxSwapIntervalSGI failed");
bob@2327
   749
        } else {
bob@2327
   750
            swapinterval = interval;
slouken@1952
   751
        }
slouken@1952
   752
    } else {
slouken@1952
   753
        SDL_Unsupported();
slouken@1952
   754
    }
slouken@1952
   755
    return status;
slouken@1952
   756
}
slouken@1952
   757
slouken@1952
   758
int
slouken@1952
   759
X11_GL_GetSwapInterval(_THIS)
slouken@1952
   760
{
icculus@5572
   761
    if (_this->gl_data->glXSwapIntervalEXT) {
icculus@5572
   762
        Display *display = ((SDL_VideoData *) _this->driverdata)->display;
icculus@5572
   763
        const SDL_WindowData *windowdata = (SDL_WindowData *)
slouken@7412
   764
            SDL_GL_GetCurrentWindow()->driverdata;
icculus@5572
   765
        Window drawable = windowdata->xwindow;
icculus@6382
   766
        unsigned int allow_late_swap_tearing = 0;
icculus@6382
   767
        unsigned int interval = 0;
icculus@6382
   768
icculus@6382
   769
        if (_this->gl_data->HAS_GLX_EXT_swap_control_tear) {
icculus@6382
   770
            _this->gl_data->glXQueryDrawable(display, drawable,
icculus@6382
   771
                                            GLX_LATE_SWAPS_TEAR_EXT,
icculus@6382
   772
                                            &allow_late_swap_tearing);
icculus@6382
   773
        }
icculus@6382
   774
icculus@5572
   775
        _this->gl_data->glXQueryDrawable(display, drawable,
icculus@6382
   776
                                         GLX_SWAP_INTERVAL_EXT, &interval);
icculus@6382
   777
icculus@6382
   778
        if ((allow_late_swap_tearing) && (interval > 0)) {
icculus@6382
   779
            return -((int) interval);
icculus@6382
   780
        }
icculus@6382
   781
icculus@6382
   782
        return (int) interval;
icculus@5572
   783
    } else if (_this->gl_data->glXGetSwapIntervalMESA) {
slouken@1952
   784
        return _this->gl_data->glXGetSwapIntervalMESA();
slouken@1952
   785
    } else {
bob@2327
   786
        return swapinterval;
slouken@1952
   787
    }
slouken@1952
   788
}
slouken@1952
   789
slouken@1952
   790
void
slouken@1952
   791
X11_GL_SwapWindow(_THIS, SDL_Window * window)
slouken@1952
   792
{
slouken@1952
   793
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
slouken@1952
   794
    Display *display = data->videodata->display;
slouken@1952
   795
slouken@3685
   796
    _this->gl_data->glXSwapBuffers(display, data->xwindow);
slouken@1952
   797
}
slouken@1952
   798
slouken@1952
   799
void
slouken@1952
   800
X11_GL_DeleteContext(_THIS, SDL_GLContext context)
slouken@1952
   801
{
slouken@1952
   802
    Display *display = ((SDL_VideoData *) _this->driverdata)->display;
slouken@1952
   803
    GLXContext glx_context = (GLXContext) context;
slouken@1952
   804
slouken@6522
   805
    if (!_this->gl_data) {
slouken@6522
   806
        return;
slouken@6522
   807
    }
slouken@1952
   808
    _this->gl_data->glXDestroyContext(display, glx_context);
icculus@7827
   809
    X11_XSync(display, False);
slouken@1952
   810
}
slouken@1952
   811
slouken@1952
   812
#endif /* SDL_VIDEO_OPENGL_GLX */
slouken@1952
   813
slouken@6044
   814
#endif /* SDL_VIDEO_DRIVER_X11 */
slouken@6044
   815
slouken@1952
   816
/* vi: set ts=4 sw=4 expandtab: */