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SDL_x11opengl.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_x11video.h"
/* GLX implementation of SDL OpenGL support */
#if SDL_VIDEO_OPENGL_GLX
#include "SDL_loadso.h"
#if defined(__IRIX__)
/* IRIX doesn't have a GL library versioning system */
#define DEFAULT_OPENGL "libGL.so"
#elif defined(__MACOSX__)
#define DEFAULT_OPENGL "/usr/X11R6/lib/libGL.1.dylib"
#elif defined(__QNXNTO__)
#define DEFAULT_OPENGL "libGL.so.3"
#else
#define DEFAULT_OPENGL "libGL.so.1"
#endif
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#ifndef GLX_NONE_EXT
#define GLX_NONE_EXT 0x8000
#endif
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#ifndef GLX_ARB_multisample
#define GLX_ARB_multisample
#define GLX_SAMPLE_BUFFERS_ARB 100000
#define GLX_SAMPLES_ARB 100001
#endif
#ifndef GLX_EXT_visual_rating
#define GLX_EXT_visual_rating
#define GLX_VISUAL_CAVEAT_EXT 0x20
#define GLX_NONE_EXT 0x8000
#define GLX_SLOW_VISUAL_EXT 0x8001
#define GLX_NON_CONFORMANT_VISUAL_EXT 0x800D
#endif
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#ifndef GLX_ARB_create_context
#define GLX_ARB_create_context
#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
#define GLX_CONTEXT_FLAGS_ARB 0x2094
#define GLX_CONTEXT_DEBUG_BIT_ARB 0x0001
#define GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x0002
#endif
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#define OPENGL_REQUIRS_DLOPEN
#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
#include <dlfcn.h>
#define GL_LoadObject(X) dlopen(X, (RTLD_NOW|RTLD_GLOBAL))
#define GL_LoadFunction dlsym
#define GL_UnloadObject dlclose
#else
#define GL_LoadObject SDL_LoadObject
#define GL_LoadFunction SDL_LoadFunction
#define GL_UnloadObject SDL_UnloadObject
#endif
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static void X11_GL_InitExtensions(_THIS);
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/* Typedef for the GL 3.0 context creation function */
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typedef GLXContext(*PFNGLXCREATECONTEXTATTRIBSARBPROC) (Display * dpy,
GLXFBConfig config,
GLXContext
share_context,
Bool direct,
const int
*attrib_list);
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int
X11_GL_LoadLibrary(_THIS, const char *path)
{
void *handle;
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/* Load the OpenGL library */
if (path == NULL) {
path = SDL_getenv("SDL_OPENGL_LIBRARY");
}
if (path == NULL) {
path = DEFAULT_OPENGL;
}
_this->gl_config.dll_handle = SDL_LoadObject(path);
if (!_this->gl_config.dll_handle) {
return -1;
}
SDL_strlcpy(_this->gl_config.driver_path, path,
SDL_arraysize(_this->gl_config.driver_path));
/* Allocate OpenGL memory */
_this->gl_data =
(struct SDL_GLDriverData *) SDL_calloc(1,
sizeof(struct
SDL_GLDriverData));
if (!_this->gl_data) {
SDL_OutOfMemory();
return -1;
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/* Load function pointers */
handle = _this->gl_config.dll_handle;
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_this->gl_data->glXGetProcAddress =
(void *(*)(const GLubyte *)) GL_LoadFunction(handle,
"glXGetProcAddressARB");
_this->gl_data->glXChooseVisual =
(XVisualInfo * (*)(Display *, int, int *)) GL_LoadFunction(handle,
"glXChooseVisual");
_this->gl_data->glXCreateContext =
(GLXContext(*)(Display *, XVisualInfo *, GLXContext, int))
GL_LoadFunction(handle, "glXCreateContext");
_this->gl_data->glXDestroyContext =
(void (*)(Display *, GLXContext)) GL_LoadFunction(handle,
"glXDestroyContext");
_this->gl_data->glXMakeCurrent =
(int (*)(Display *, GLXDrawable, GLXContext)) GL_LoadFunction(handle,
"glXMakeCurrent");
_this->gl_data->glXSwapBuffers =
(void (*)(Display *, GLXDrawable)) GL_LoadFunction(handle,
"glXSwapBuffers");
if (!_this->gl_data->glXChooseVisual ||
!_this->gl_data->glXCreateContext ||
!_this->gl_data->glXDestroyContext ||
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!_this->gl_data->glXMakeCurrent || !_this->gl_data->glXSwapBuffers) {
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SDL_SetError("Could not retrieve OpenGL functions");
return -1;
}
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/* Initialize extensions */
X11_GL_InitExtensions(_this);
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return 0;
}
void *
X11_GL_GetProcAddress(_THIS, const char *proc)
{
void *handle;
handle = _this->gl_config.dll_handle;
if (_this->gl_data->glXGetProcAddress) {
return _this->gl_data->glXGetProcAddress((const GLubyte *) proc);
}
return GL_LoadFunction(handle, proc);
}
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X11_GL_UnloadLibrary(_THIS)
{
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/* Don't actually unload the library, since it may have registered
* X11 shutdown hooks, per the notes at:
* http://dri.sourceforge.net/doc/DRIuserguide.html
*/
#if 0
GL_UnloadObject(_this->gl_config.dll_handle);
_this->gl_config.dll_handle = NULL;
#endif
/* Free OpenGL memory */
SDL_free(_this->gl_data);
_this->gl_data = NULL;
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}
static SDL_bool
HasExtension(const char *extension, const char *extensions)
{
const char *start;
const char *where, *terminator;
/* Extension names should not have spaces. */
where = SDL_strchr(extension, ' ');
if (where || *extension == '\0')
return SDL_FALSE;
if (!extensions)
return SDL_FALSE;
/* It takes a bit of care to be fool-proof about parsing the
* OpenGL extensions string. Don't be fooled by sub-strings,
* etc. */
start = extensions;
for (;;) {
where = SDL_strstr(start, extension);
if (!where)
break;
terminator = where + SDL_strlen(extension);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || *terminator == '\0')
return SDL_TRUE;
start = terminator;
}
return SDL_FALSE;
}
static void
X11_GL_InitExtensions(_THIS)
{
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
int screen = ((SDL_DisplayData *) SDL_CurrentDisplay.driverdata)->screen;
XVisualInfo *vinfo;
XSetWindowAttributes xattr;
Window w;
GLXContext context;
const char *(*glXQueryExtensionsStringFunc) (Display *, int);
const char *extensions;
vinfo = X11_GL_GetVisual(_this, display, screen);
if (!vinfo) {
return;
}
xattr.background_pixel = 0;
xattr.border_pixel = 0;
xattr.colormap =
XCreateColormap(display, RootWindow(display, screen), vinfo->visual,
AllocNone);
w = XCreateWindow(display, RootWindow(display, screen), 0, 0, 32, 32, 0,
vinfo->depth, InputOutput, vinfo->visual,
(CWBackPixel | CWBorderPixel | CWColormap), &xattr);
context = _this->gl_data->glXCreateContext(display, vinfo, NULL, True);
if (context) {
_this->gl_data->glXMakeCurrent(display, w, context);
}
XFree(vinfo);
glXQueryExtensionsStringFunc =
(const char *(*)(Display *, int)) X11_GL_GetProcAddress(_this,
"glXQueryExtensionsString");
if (glXQueryExtensionsStringFunc) {
extensions = glXQueryExtensionsStringFunc(display, screen);
} else {
extensions = NULL;
}
/* Check for SGI_swap_control */
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if (HasExtension("GLX_SGI_swap_control", extensions)) {
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_this->gl_data->glXSwapIntervalSGI =
(int (*)(int)) X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");
}
/* Check for GLX_MESA_swap_control */
if (HasExtension("GLX_MESA_swap_control", extensions)) {
_this->gl_data->glXSwapIntervalMESA =
(GLint(*)(unsigned)) X11_GL_GetProcAddress(_this,
"glXSwapIntervalMESA");
_this->gl_data->glXGetSwapIntervalMESA =
(GLint(*)(void)) X11_GL_GetProcAddress(_this,
"glXGetSwapIntervalMESA");
}
/* Check for GLX_EXT_visual_rating */
if (HasExtension("GLX_EXT_visual_rating", extensions)) {
_this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;
}
if (context) {
_this->gl_data->glXMakeCurrent(display, None, NULL);
_this->gl_data->glXDestroyContext(display, context);
}
XDestroyWindow(display, w);
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X11_PumpEvents(_this);
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}
XVisualInfo *
X11_GL_GetVisual(_THIS, Display * display, int screen)
{
XVisualInfo *vinfo;
/* 64 seems nice. */
int attribs[64];
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int i = 0;
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/* Setup our GLX attributes according to the gl_config. */
attribs[i++] = GLX_RGBA;
attribs[i++] = GLX_RED_SIZE;
attribs[i++] = _this->gl_config.red_size;
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = _this->gl_config.green_size;
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = _this->gl_config.blue_size;
if (_this->gl_config.alpha_size) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = _this->gl_config.alpha_size;
}
if (_this->gl_config.buffer_size) {
attribs[i++] = GLX_BUFFER_SIZE;
attribs[i++] = _this->gl_config.buffer_size;
}
if (_this->gl_config.double_buffer) {
attribs[i++] = GLX_DOUBLEBUFFER;
}
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = _this->gl_config.depth_size;
if (_this->gl_config.stencil_size) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = _this->gl_config.stencil_size;
}
if (_this->gl_config.accum_red_size) {
attribs[i++] = GLX_ACCUM_RED_SIZE;
attribs[i++] = _this->gl_config.accum_red_size;
}
if (_this->gl_config.accum_green_size) {
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
attribs[i++] = _this->gl_config.accum_green_size;
}
if (_this->gl_config.accum_blue_size) {
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
attribs[i++] = _this->gl_config.accum_blue_size;
}
if (_this->gl_config.accum_alpha_size) {
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
attribs[i++] = _this->gl_config.accum_alpha_size;
}
if (_this->gl_config.stereo) {
attribs[i++] = GLX_STEREO;
}
if (_this->gl_config.multisamplebuffers) {
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
attribs[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attribs[i++] = GLX_SAMPLES_ARB;
attribs[i++] = _this->gl_config.multisamplesamples;
}
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if (_this->gl_data->HAS_GLX_EXT_visual_rating) {
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attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
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attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
GLX_SLOW_VISUAL_EXT;
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#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
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if (X11_UseDirectColorVisuals()) {
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attribs[i++] = GLX_X_VISUAL_TYPE;
attribs[i++] = GLX_DIRECT_COLOR;
}
#endif
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attribs[i++] = None;
vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
#ifdef GLX_DIRECT_COLOR
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if (!vinfo && X11_UseDirectColorVisuals()) { /* No DirectColor visual? Try again.. */
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attribs[i - 3] = None;
vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
}
#endif
if (!vinfo) {
SDL_SetError("Couldn't find matching GLX visual");
}
return vinfo;
}
SDL_GLContext
X11_GL_CreateContext(_THIS, SDL_Window * window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
Display *display = data->videodata->display;
int screen =
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((SDL_DisplayData *) SDL_GetDisplayFromWindow(window)->
driverdata)->screen;
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XWindowAttributes xattr;
XVisualInfo v, *vinfo;
int n;
GLXContext context = NULL;
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XSync(display, False);
XGetWindowAttributes(display, data->window, &xattr);
v.screen = screen;
v.visualid = XVisualIDFromVisual(xattr.visual);
vinfo = XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);
if (vinfo) {
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if (_this->gl_config.major_version < 3) {
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context =
_this->gl_data->glXCreateContext(display, vinfo, NULL, True);
} else {
/* If we want a GL 3.0 context or later we need to get a temporary
context to grab the new context creation function */
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GLXContext temp_context =
_this->gl_data->glXCreateContext(display, vinfo, NULL, True);
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if (!temp_context) {
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SDL_SetError("Could not create GL context");
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return NULL;
} else {
int attribs[] = {
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GLX_CONTEXT_MAJOR_VERSION_ARB,
_this->gl_config.major_version,
GLX_CONTEXT_MINOR_VERSION_ARB,
_this->gl_config.minor_version,
0
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/* Get a pointer to the context creation function for GL 3.0 */
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PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribs =
(PFNGLXCREATECONTEXTATTRIBSARBPROC) _this->gl_data->
glXGetProcAddress((GLubyte *)
"glXCreateContextAttribsARB");
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if (!glXCreateContextAttribs) {
SDL_SetError("GL 3.x is not supported");
context = temp_context;
} else {
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/* Create a GL 3.x context */
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GLXFBConfig *framebuffer_config = NULL;
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int fbcount = 0;
GLXFBConfig *(*glXChooseFBConfig) (Display * disp,
int screen,
const int *attrib_list,
int *nelements);
glXChooseFBConfig =
(GLXFBConfig *
(*)(Display *, int, const int *,
int *)) _this->gl_data->
glXGetProcAddress((GLubyte *) "glXChooseFBConfig");
if (!glXChooseFBConfig
|| !(framebuffer_config =
glXChooseFBConfig(display,
DefaultScreen(display), NULL,
&fbcount))) {
SDL_SetError
("No good framebuffers found. GL 3.x disabled");
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context = temp_context;
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} else {
context =
glXCreateContextAttribs(display,
framebuffer_config[0],
NULL, True, attribs);
_this->gl_data->glXDestroyContext(display,
temp_context);
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}
}
}
}
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XFree(vinfo);
}
XSync(display, False);
if (!context) {
SDL_SetError("Could not create GL context");
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return NULL;
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if (X11_GL_MakeCurrent(_this, window, context) < 0) {
X11_GL_DeleteContext(_this, context);
return NULL;
}
return context;
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}
int
X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
{
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
Window drawable =
(window ? ((SDL_WindowData *) window->driverdata)->window : None);
GLXContext glx_context = (GLXContext) context;
int status;
status = 0;
if (!_this->gl_data->glXMakeCurrent(display, drawable, glx_context)) {
SDL_SetError("Unable to make GL context current");
status = -1;
}
XSync(display, False);
return (status);
}
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/*
0 is a valid argument to glxSwapIntervalMESA and setting it to 0
with the MESA version of the extension will undo the effect of a
previous call with a value that is greater than zero (or at least
that is what the FM says. OTOH, 0 is an invalid argument to
glxSwapIntervalSGI and it returns an error if you call it with 0 as
an argument.
*/
static int swapinterval = -1;
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int
X11_GL_SetSwapInterval(_THIS, int interval)
{
int status;
if (_this->gl_data->glXSwapIntervalMESA) {
status = _this->gl_data->glXSwapIntervalMESA(interval);
if (status != 0) {
SDL_SetError("glxSwapIntervalMESA failed");
status = -1;
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} else {
swapinterval = interval;
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}
} else if (_this->gl_data->glXSwapIntervalSGI) {
status = _this->gl_data->glXSwapIntervalSGI(interval);
if (status != 0) {
SDL_SetError("glxSwapIntervalSGI failed");
status = -1;
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} else {
swapinterval = interval;
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}
} else {
SDL_Unsupported();
status = -1;
}
return status;
}
int
X11_GL_GetSwapInterval(_THIS)
{
if (_this->gl_data->glXGetSwapIntervalMESA) {
return _this->gl_data->glXGetSwapIntervalMESA();
} else {
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return swapinterval;
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}
}
void
X11_GL_SwapWindow(_THIS, SDL_Window * window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
Display *display = data->videodata->display;
_this->gl_data->glXSwapBuffers(display, data->window);
}
void
X11_GL_DeleteContext(_THIS, SDL_GLContext context)
{
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
GLXContext glx_context = (GLXContext) context;
_this->gl_data->glXDestroyContext(display, glx_context);
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XSync(display, False);
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}
#endif /* SDL_VIDEO_OPENGL_GLX */
/* vi: set ts=4 sw=4 expandtab: */