/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2009 Sam Lantinga

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

License along with this library; if not, write to the Free Software

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"

#include "../../events/SDL_events_c.h"

#include "SDL_x11dga_c.h"

#include "SDL_x11gl_c.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"

#elif defined(__OpenBSD__)

#define DEFAULT_OPENGL "libGL.so.4.0"

#else

#define DEFAULT_OPENGL "libGL.so.1"

#endif

#ifndef GLX_ARB_multisample

#define GLX_ARB_multisample

#define GLX_SAMPLE_BUFFERS_ARB 100000

#define GLX_SAMPLES_ARB 100001

#endif

/* GLX_EXT_visual_rating stuff that might not be in the system headers... */

#ifndef GLX_VISUAL_CAVEAT_EXT

#define GLX_VISUAL_CAVEAT_EXT 0x20

#endif

#ifndef GLX_NONE_EXT

#define GLX_NONE_EXT 0x8000

#endif

#ifndef GLX_SLOW_VISUAL_EXT

#define GLX_SLOW_VISUAL_EXT 0x8001

#endif

#ifndef GLX_NON_CONFORMANT_VISUAL_EXT

#define GLX_NON_CONFORMANT_VISUAL_EXT 0x800D

#endif

#if SDL_VIDEO_OPENGL_GLX

static int glXExtensionSupported(_THIS, 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 0;

}

extensions = this->gl_data->glXQueryExtensionsString(GFX_Display,SDL_Screen);

/* 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 + strlen(extension);

if (where == start || *(where - 1) == ' ')

if (*terminator == ' ' || *terminator == '\0') return 1;

start = terminator;

}

return 0;

}

#endif /* SDL_VIDEO_OPENGL_GLX */

XVisualInfo *X11_GL_GetVisual(_THIS)

{

#if SDL_VIDEO_OPENGL_GLX

/* 64 seems nice. */

int attribs[64];

int i;

/* load the gl driver from a default path */

if ( ! this->gl_config.driver_loaded ) {

/* no driver has been loaded, use default (ourselves) */

if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {

return NULL;

}

}

/* See if we already have a window which we must use */

if ( SDL_windowid ) {

XWindowAttributes a;

XVisualInfo vi_in;

int out_count;

XGetWindowAttributes(SDL_Display, SDL_Window, &a);

vi_in.screen = SDL_Screen;

vi_in.visualid = XVisualIDFromVisual(a.visual);

glx_visualinfo = XGetVisualInfo(SDL_Display,

VisualScreenMask|VisualIDMask, &vi_in, &out_count);

return glx_visualinfo;

}

/* Setup our GLX attributes according to the gl_config. */

i = 0;

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;

}

if( this->gl_config.accelerated >= 0 &&

glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {

attribs[i++] = GLX_VISUAL_CAVEAT_EXT;

attribs[i++] = GLX_NONE_EXT;

}

#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */

if ( !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) {

attribs[i++] = GLX_X_VISUAL_TYPE;

attribs[i++] = GLX_DIRECT_COLOR;

}

#endif

attribs[i++] = None;

glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,

SDL_Screen, attribs);

#ifdef GLX_DIRECT_COLOR

if( !glx_visualinfo && !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) { /* No DirectColor visual? Try again.. */

attribs[i-3] = None;

glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,

SDL_Screen, attribs);

}

#endif

if( !glx_visualinfo ) {

SDL_SetError( "Couldn't find matching GLX visual");

return NULL;

}

/*

printf("Found GLX visual 0x%x\n", glx_visualinfo->visualid);

*/

return glx_visualinfo;

#else

SDL_SetError("X11 driver not configured with OpenGL");

return NULL;

#endif

}

int X11_GL_CreateWindow(_THIS, int w, int h)

{

int retval;

#if SDL_VIDEO_OPENGL_GLX

XSetWindowAttributes attributes;

unsigned long mask;

unsigned long black;

black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,

SDL_Screen))

? BlackPixel(SDL_Display, SDL_Screen) : 0;

attributes.background_pixel = black;

attributes.border_pixel = black;

attributes.colormap = SDL_XColorMap;

mask = CWBackPixel | CWBorderPixel | CWColormap;

SDL_Window = XCreateWindow(SDL_Display, WMwindow,

0, 0, w, h, 0, glx_visualinfo->depth,

InputOutput, glx_visualinfo->visual,

mask, &attributes);

if ( !SDL_Window ) {

SDL_SetError("Could not create window");

return -1;

}

retval = 0;

#else

SDL_SetError("X11 driver not configured with OpenGL");

retval = -1;

#endif

return(retval);

}

int X11_GL_CreateContext(_THIS)

{

int retval;

#if SDL_VIDEO_OPENGL_GLX

/* We do this to create a clean separation between X and GLX errors. */

XSync( SDL_Display, False );

glx_context = this->gl_data->glXCreateContext(GFX_Display,

glx_visualinfo, NULL, True);

XSync( GFX_Display, False );

if ( glx_context == NULL ) {

SDL_SetError("Could not create GL context");

return(-1);

}

if ( X11_GL_MakeCurrent(this) < 0 ) {

return(-1);

}

gl_active = 1;

if ( !glXExtensionSupported(this, "GLX_SGI_swap_control") ) {

this->gl_data->glXSwapIntervalSGI = NULL;

}

if ( !glXExtensionSupported(this, "GLX_MESA_swap_control") ) {

this->gl_data->glXSwapIntervalMESA = NULL;

this->gl_data->glXGetSwapIntervalMESA = NULL;

}

if ( this->gl_config.swap_control >= 0 ) {

if ( this->gl_data->glXSwapIntervalMESA ) {

this->gl_data->glXSwapIntervalMESA(this->gl_config.swap_control);

} else if ( this->gl_data->glXSwapIntervalSGI ) {

if (this->gl_data->glXSwapIntervalSGI(this->gl_config.swap_control) == 0) {

this->gl_data->sgi_swap_interval = this->gl_config.swap_control;

}

}

}

#else

SDL_SetError("X11 driver not configured with OpenGL");

#endif

if ( gl_active ) {

retval = 0;

} else {

retval = -1;

}

return(retval);

}

void X11_GL_Shutdown(_THIS)

{

#if SDL_VIDEO_OPENGL_GLX

/* Clean up OpenGL */

if( glx_context ) {

this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);

if (glx_context != NULL)

this->gl_data->glXDestroyContext(GFX_Display, glx_context);

glx_context = NULL;

}

gl_active = 0;

#endif /* SDL_VIDEO_OPENGL_GLX */

}

#if SDL_VIDEO_OPENGL_GLX

/* Make the current context active */

int X11_GL_MakeCurrent(_THIS)

{

int retval;

retval = 0;

if ( ! this->gl_data->glXMakeCurrent(GFX_Display,

SDL_Window, glx_context) ) {

SDL_SetError("Unable to make GL context current");

retval = -1;

}

XSync( GFX_Display, False );

/* More Voodoo X server workarounds... Grr... */

SDL_Lock_EventThread();

X11_CheckDGAMouse(this);

SDL_Unlock_EventThread();

return(retval);

}

/* Get attribute data from glX. */

int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)

{

int retval = -1;

int unsupported = 0;

int glx_attrib = None;

switch( attrib ) {

case SDL_GL_RED_SIZE:

glx_attrib = GLX_RED_SIZE;

break;

case SDL_GL_GREEN_SIZE:

glx_attrib = GLX_GREEN_SIZE;

break;

case SDL_GL_BLUE_SIZE:

glx_attrib = GLX_BLUE_SIZE;

break;

case SDL_GL_ALPHA_SIZE:

glx_attrib = GLX_ALPHA_SIZE;

break;

case SDL_GL_DOUBLEBUFFER:

glx_attrib = GLX_DOUBLEBUFFER;

break;

case SDL_GL_BUFFER_SIZE:

glx_attrib = GLX_BUFFER_SIZE;

break;

case SDL_GL_DEPTH_SIZE:

glx_attrib = GLX_DEPTH_SIZE;

break;

case SDL_GL_STENCIL_SIZE:

glx_attrib = GLX_STENCIL_SIZE;

break;

case SDL_GL_ACCUM_RED_SIZE:

glx_attrib = GLX_ACCUM_RED_SIZE;

break;

case SDL_GL_ACCUM_GREEN_SIZE:

glx_attrib = GLX_ACCUM_GREEN_SIZE;

break;

case SDL_GL_ACCUM_BLUE_SIZE:

glx_attrib = GLX_ACCUM_BLUE_SIZE;

break;

case SDL_GL_ACCUM_ALPHA_SIZE:

glx_attrib = GLX_ACCUM_ALPHA_SIZE;

break;

case SDL_GL_STEREO:

glx_attrib = GLX_STEREO;

break;

case SDL_GL_MULTISAMPLEBUFFERS:

glx_attrib = GLX_SAMPLE_BUFFERS_ARB;

break;

case SDL_GL_MULTISAMPLESAMPLES:

glx_attrib = GLX_SAMPLES_ARB;

break;

case SDL_GL_ACCELERATED_VISUAL:

if ( glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {

glx_attrib = GLX_VISUAL_CAVEAT_EXT;

retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);

if ( *value == GLX_SLOW_VISUAL_EXT ) {

*value = SDL_FALSE;

} else {

*value = SDL_TRUE;

}

return retval;

} else {

unsupported = 1;

}

break;

case SDL_GL_SWAP_CONTROL:

if ( this->gl_data->glXGetSwapIntervalMESA ) {

*value = this->gl_data->glXGetSwapIntervalMESA();

return 0;

} else if ( this->gl_data->glXSwapIntervalSGI ) {

*value = this->gl_data->sgi_swap_interval;

return 0;

} else {

unsupported = 1;

}

break;

default:

unsupported = 1;

break;

}

if (unsupported) {

SDL_SetError("OpenGL attribute is unsupported on this system");

} else {

retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);

}

return retval;

}

void X11_GL_SwapBuffers(_THIS)

{

this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);

}

#endif /* SDL_VIDEO_OPENGL_GLX */

#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

void X11_GL_UnloadLibrary(_THIS)

{

#if SDL_VIDEO_OPENGL_GLX

if ( this->gl_config.driver_loaded ) {

GL_UnloadObject(this->gl_config.dll_handle);

this->gl_data->glXGetProcAddress = NULL;

this->gl_data->glXChooseVisual = NULL;

this->gl_data->glXCreateContext = NULL;

this->gl_data->glXDestroyContext = NULL;

this->gl_data->glXMakeCurrent = NULL;

this->gl_data->glXSwapBuffers = NULL;

this->gl_data->glXSwapIntervalSGI = NULL;

this->gl_data->glXSwapIntervalMESA = NULL;

this->gl_data->glXGetSwapIntervalMESA = NULL;

this->gl_config.dll_handle = NULL;

this->gl_config.driver_loaded = 0;

}

#endif

}

#if SDL_VIDEO_OPENGL_GLX

/* Passing a NULL path means load pointers from the application */

int X11_GL_LoadLibrary(_THIS, const char* path)

{

void* handle = NULL;

if ( gl_active ) {

SDL_SetError("OpenGL context already created");

return -1;

}

if ( path == NULL ) {

path = SDL_getenv("SDL_VIDEO_GL_DRIVER");

if ( path == NULL ) {

path = DEFAULT_OPENGL;

}

}

handle = GL_LoadObject(path);

if ( handle == NULL ) {

#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)

SDL_SetError("Failed loading %s", path);

#else

/* SDL_LoadObject() will call SDL_SetError() for us. */

#endif

return -1;

}

/* Unload the old driver and reset the pointers */

X11_GL_UnloadLibrary(this);

/* Load new function pointers */

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");

this->gl_data->glXGetConfig =

(int (*)(Display *, XVisualInfo *, int, int *)) GL_LoadFunction(handle, "glXGetConfig");

this->gl_data->glXQueryExtensionsString =

(const char *(*)(Display *, int)) GL_LoadFunction(handle, "glXQueryExtensionsString");

this->gl_data->glXSwapIntervalSGI =

(int (*)(int)) GL_LoadFunction(handle, "glXSwapIntervalSGI");

this->gl_data->glXSwapIntervalMESA =

(GLint (*)(unsigned)) GL_LoadFunction(handle, "glXSwapIntervalMESA");

this->gl_data->glXGetSwapIntervalMESA =

(GLint (*)(void)) GL_LoadFunction(handle, "glXGetSwapIntervalMESA");

if ( (this->gl_data->glXChooseVisual == NULL) ||

(this->gl_data->glXCreateContext == NULL) ||

(this->gl_data->glXDestroyContext == NULL) ||

(this->gl_data->glXMakeCurrent == NULL) ||

(this->gl_data->glXSwapBuffers == NULL) ||

(this->gl_data->glXGetConfig == NULL) ||

(this->gl_data->glXQueryExtensionsString == NULL)) {

SDL_SetError("Could not retrieve OpenGL functions");

return -1;

}

this->gl_config.dll_handle = handle;

this->gl_config.driver_loaded = 1;

if ( path ) {

SDL_strlcpy(this->gl_config.driver_path, path,

SDL_arraysize(this->gl_config.driver_path));

} else {

*this->gl_config.driver_path = '\0';

}

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);

}

#endif /* SDL_VIDEO_OPENGL_GLX */