src/video/x11/SDL_x11gl.c
author Sam Lantinga <slouken@libsdl.org>
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#include <stdlib.h>	/* For getenv() prototype */
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#include <string.h>
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#include "SDL_events_c.h"
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#include "SDL_error.h"
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#include "SDL_x11video.h"
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#include "SDL_x11dga_c.h"
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#include "SDL_x11gl_c.h"
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#define DEFAULT_OPENGL	"libGL.so.1"
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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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/* return the preferred visual to use for openGL graphics */
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XVisualInfo *X11_GL_GetVisual(_THIS)
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{
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#ifdef HAVE_OPENGL
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	/* 64 seems nice. */
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	int attribs[64];
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	int i;
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	/* load the gl driver from a default path */
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	if ( ! this->gl_config.driver_loaded ) {
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	        /* no driver has been loaded, use default (ourselves) */
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	        if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
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		        return NULL;
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		}
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	}
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	/* See if we already have a window which we must use */
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	if ( SDL_windowid ) {
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		XWindowAttributes a;
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		XVisualInfo vi_in;
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		int out_count;
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		XGetWindowAttributes(SDL_Display, SDL_Window, &a);
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		vi_in.screen = SDL_Screen;
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		vi_in.visualid = XVisualIDFromVisual(a.visual);
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		glx_visualinfo = XGetVisualInfo(SDL_Display,
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	                     VisualScreenMask|VisualIDMask, &vi_in, &out_count);
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		return glx_visualinfo;
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	}
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        /* Setup our GLX attributes according to the gl_config. */
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	i = 0;
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	attribs[i++] = GLX_RGBA;
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	attribs[i++] = GLX_RED_SIZE;
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	attribs[i++] = this->gl_config.red_size;
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	attribs[i++] = GLX_GREEN_SIZE;
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	attribs[i++] = this->gl_config.green_size;
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	attribs[i++] = GLX_BLUE_SIZE;
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	attribs[i++] = this->gl_config.blue_size;
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	if( this->gl_config.alpha_size ) {
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		attribs[i++] = GLX_ALPHA_SIZE;
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		attribs[i++] = this->gl_config.alpha_size;
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	}
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	if( this->gl_config.buffer_size ) {
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		attribs[i++] = GLX_BUFFER_SIZE;
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		attribs[i++] = this->gl_config.buffer_size;
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	}
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	if( this->gl_config.double_buffer ) {
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		attribs[i++] = GLX_DOUBLEBUFFER;
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	}
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	attribs[i++] = GLX_DEPTH_SIZE;
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	attribs[i++] = this->gl_config.depth_size;
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	if( this->gl_config.stencil_size ) {
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		attribs[i++] = GLX_STENCIL_SIZE;
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		attribs[i++] = this->gl_config.stencil_size;
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	}
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	if( this->gl_config.accum_red_size ) {
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		attribs[i++] = GLX_ACCUM_RED_SIZE;
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		attribs[i++] = this->gl_config.accum_red_size;
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	}
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	if( this->gl_config.accum_green_size ) {
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		attribs[i++] = GLX_ACCUM_GREEN_SIZE;
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		attribs[i++] = this->gl_config.accum_green_size;
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	}
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	if( this->gl_config.accum_blue_size ) {
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		attribs[i++] = GLX_ACCUM_BLUE_SIZE;
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		attribs[i++] = this->gl_config.accum_blue_size;
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	}
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	if( this->gl_config.accum_alpha_size ) {
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		attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
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		attribs[i++] = this->gl_config.accum_alpha_size;
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	}
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	if( this->gl_config.stereo ) {
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		attribs[i++] = GLX_STEREO;
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		attribs[i++] = this->gl_config.stereo;
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	}
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	if( this->gl_config.multisamplebuffers ) {
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		attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
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		attribs[i++] = this->gl_config.multisamplebuffers;
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	}
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	if( this->gl_config.multisamplesamples ) {
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		attribs[i++] = GLX_SAMPLES_ARB;
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		attribs[i++] = this->gl_config.multisamplesamples;
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	}
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#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
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	attribs[i++] = GLX_X_VISUAL_TYPE;
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	attribs[i++] = GLX_DIRECT_COLOR;
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#endif
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	attribs[i++] = None;
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 	glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, 
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						  SDL_Screen, attribs);
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#ifdef GLX_DIRECT_COLOR
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	if( !glx_visualinfo ) { /* No DirectColor visual?  Try again.. */
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		attribs[i-3] = None;
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 		glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, 
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						  SDL_Screen, attribs);
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	}
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#endif
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	if( !glx_visualinfo ) {
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		SDL_SetError( "Couldn't find matching GLX visual");
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		return NULL;
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	}
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	return glx_visualinfo;
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#else
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	SDL_SetError("X11 driver not configured with OpenGL");
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	return NULL;
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#endif
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}
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int X11_GL_CreateWindow(_THIS, int w, int h)
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{
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	int retval;
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#ifdef HAVE_OPENGL
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	XSetWindowAttributes attributes;
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	unsigned long mask;
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	unsigned long black;
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	black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
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						 	SDL_Screen))
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	       	? BlackPixel(SDL_Display, SDL_Screen) : 0;
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	attributes.background_pixel = black;
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	attributes.border_pixel = black;
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	attributes.colormap = SDL_XColorMap;
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	mask = CWBackPixel | CWBorderPixel | CWColormap;
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	SDL_Window = XCreateWindow(SDL_Display, WMwindow,
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			0, 0, w, h, 0, glx_visualinfo->depth,
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			InputOutput, glx_visualinfo->visual,
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			mask, &attributes);
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	if ( !SDL_Window ) {
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		SDL_SetError("Could not create window");
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		return -1;
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	}
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	retval = 0;
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#else
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	SDL_SetError("X11 driver not configured with OpenGL");
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	retval = -1;
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#endif
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	return(retval);
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}
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int X11_GL_CreateContext(_THIS)
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{
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	int retval;
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#ifdef HAVE_OPENGL
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	/* We do this to create a clean separation between X and GLX errors. */
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	XSync( SDL_Display, False );
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	glx_context = this->gl_data->glXCreateContext(GFX_Display, 
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				     glx_visualinfo, NULL, True);
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	XSync( GFX_Display, False );
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	if (glx_context == NULL) {
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		SDL_SetError("Could not create GL context");
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		return -1;
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	}
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	gl_active = 1;
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#else
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	SDL_SetError("X11 driver not configured with OpenGL");
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#endif
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	if ( gl_active ) {
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		retval = 0;
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	} else {
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		retval = -1;
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	}
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	return(retval);
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}
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void X11_GL_Shutdown(_THIS)
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{
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#ifdef HAVE_OPENGL
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	/* Clean up OpenGL */
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	if( glx_context ) {
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		this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
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		if (glx_context != NULL)
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			this->gl_data->glXDestroyContext(GFX_Display, glx_context);
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		if( this->gl_data->glXReleaseBuffersMESA ) {
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		    this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
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		}
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		glx_context = NULL;
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	}
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	gl_active = 0;
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#endif /* HAVE_OPENGL */
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}
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#ifdef HAVE_OPENGL
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static int ExtensionSupported(const char *extension)
638
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{
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	const GLubyte *extensions = NULL;
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	const GLubyte *start;
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	GLubyte *where, *terminator;
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	/* Extension names should not have spaces. */
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	where = (GLubyte *) strchr(extension, ' ');
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	if (where || *extension == '\0')
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	      return 0;
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643
564716cfb502 Removed direct dependency on OpenGL (call current_video->glGetString() instead
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	extensions = current_video->glGetString(GL_EXTENSIONS);
638
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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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	{
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		where = (GLubyte *) strstr((const char *) start, extension);
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		if (!where) break;
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   270
		
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		terminator = where + strlen(extension);
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		if (where == start || *(where - 1) == ' ')
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	        if (*terminator == ' ' || *terminator == '\0') return 1;
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		start = terminator;
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	}
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	return 0;
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}
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0
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/* Make the current context active */
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int X11_GL_MakeCurrent(_THIS)
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{
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	int retval;
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0
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	retval = 0;
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	if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
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	                                     SDL_Window, glx_context) ) {
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		SDL_SetError("Unable to make GL context current");
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		retval = -1;
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	}
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	XSync( GFX_Display, False );
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	/* 
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Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   295
	 * The context is now current, check for glXReleaseBuffersMESA() 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   296
	 * extension. If extension is _not_ supported, destroy the pointer 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   297
	 * (to make sure it will not be called in X11_GL_Shutdown() ).
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   298
	 * 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   299
	 * DRI/Mesa drivers include glXReleaseBuffersMESA() in the libGL.so, 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   300
	 * but there's no need to call it (is is only needed for some old 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   301
	 * non-DRI drivers).
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   302
	 * 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   303
	 * When using for example glew (http://glew.sf.net), dlsym() for
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   304
	 * glXReleaseBuffersMESA() returns the pointer from the glew library
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   305
	 * (namespace conflict).
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   306
	 *
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   307
	 * The glXReleaseBuffersMESA() pointer in the glew is NULL, if the 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   308
	 * driver doesn't support this extension. So blindly calling it will
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   309
	 * cause segfault with DRI/Mesa drivers!
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   310
	 * 
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   311
	 */
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   312
	
655
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   313
	if ( ! ExtensionSupported("glXReleaseBuffersMESA") ) {
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   314
		this->gl_data->glXReleaseBuffersMESA = NULL;
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   315
	}
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   316
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   317
	/* More Voodoo X server workarounds... Grr... */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   318
	SDL_Lock_EventThread();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   319
	X11_CheckDGAMouse(this);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   320
	SDL_Unlock_EventThread();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   321
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   322
	return(retval);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   323
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   324
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   325
/* Get attribute data from glX. */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   326
int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   327
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   328
	int retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   329
	int glx_attrib = None;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   330
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   331
	switch( attrib ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   332
	    case SDL_GL_RED_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   333
		glx_attrib = GLX_RED_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   334
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   335
	    case SDL_GL_GREEN_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   336
		glx_attrib = GLX_GREEN_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   337
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   338
	    case SDL_GL_BLUE_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   339
		glx_attrib = GLX_BLUE_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   340
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   341
	    case SDL_GL_ALPHA_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   342
		glx_attrib = GLX_ALPHA_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   343
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   344
	    case SDL_GL_DOUBLEBUFFER:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   345
		glx_attrib = GLX_DOUBLEBUFFER;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   346
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   347
	    case SDL_GL_BUFFER_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   348
		glx_attrib = GLX_BUFFER_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   349
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   350
	    case SDL_GL_DEPTH_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   351
		glx_attrib = GLX_DEPTH_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   352
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   353
	    case SDL_GL_STENCIL_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   354
		glx_attrib = GLX_STENCIL_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
	    case SDL_GL_ACCUM_RED_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   357
		glx_attrib = GLX_ACCUM_RED_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
	    case SDL_GL_ACCUM_GREEN_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   360
		glx_attrib = GLX_ACCUM_GREEN_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   361
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
	    case SDL_GL_ACCUM_BLUE_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   363
		glx_attrib = GLX_ACCUM_BLUE_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   364
		break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
	    case SDL_GL_ACCUM_ALPHA_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   366
		glx_attrib = GLX_ACCUM_ALPHA_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   367
		break;
450
8a43e0cbf02f Added SDL_GL_STEREO for stereoscopic OpenGL contexts
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   368
	    case SDL_GL_STEREO:
8a43e0cbf02f Added SDL_GL_STEREO for stereoscopic OpenGL contexts
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   369
		glx_attrib = GLX_STEREO;
8a43e0cbf02f Added SDL_GL_STEREO for stereoscopic OpenGL contexts
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   370
		break;
656
864e2d2a9a55 Merged in Ryan's multisample code for MacOS, and changed the constants to match.
Sam Lantinga <slouken@libsdl.org>
parents: 655
diff changeset
   371
 	    case SDL_GL_MULTISAMPLEBUFFERS:
655
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   372
 		glx_attrib = GLX_SAMPLE_BUFFERS_ARB;
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   373
 		break;
656
864e2d2a9a55 Merged in Ryan's multisample code for MacOS, and changed the constants to match.
Sam Lantinga <slouken@libsdl.org>
parents: 655
diff changeset
   374
 	    case SDL_GL_MULTISAMPLESAMPLES:
655
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   375
 		glx_attrib = GLX_SAMPLES_ARB;
9c42ee1b7d77 Date: Thu, 24 Apr 2003 15:13:47 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 646
diff changeset
   376
 		break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   377
	    default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   378
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   379
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   380
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   381
	retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   382
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   383
	return retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   384
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   385
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   386
void X11_GL_SwapBuffers(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   387
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   388
	this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   389
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   390
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
#endif /* HAVE_OPENGL */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   392
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   393
void X11_GL_UnloadLibrary(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   394
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   395
#ifdef HAVE_OPENGL
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   396
	if ( this->gl_config.driver_loaded ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   397
		dlclose(this->gl_config.dll_handle);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   398
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
		this->gl_data->glXGetProcAddress = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
		this->gl_data->glXChooseVisual = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   401
		this->gl_data->glXCreateContext = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   402
		this->gl_data->glXDestroyContext = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   403
		this->gl_data->glXMakeCurrent = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   404
		this->gl_data->glXSwapBuffers = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   405
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   406
		this->gl_config.dll_handle = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   407
		this->gl_config.driver_loaded = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   408
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   409
#endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   410
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   411
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
#ifdef HAVE_OPENGL
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   413
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   414
/* Passing a NULL path means load pointers from the application */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   415
int X11_GL_LoadLibrary(_THIS, const char* path) 
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   416
{
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   417
	void* handle;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   418
	int dlopen_flags;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   419
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   420
 	if ( gl_active ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   421
 		SDL_SetError("OpenGL context already created");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   422
 		return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   423
 	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   425
#ifdef RTLD_GLOBAL
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   426
	dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
#else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
	dlopen_flags = RTLD_LAZY;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
#endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   430
	handle = dlopen(path, dlopen_flags);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   431
	/* Catch the case where the application isn't linked with GL */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   432
	if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
		dlclose(handle);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   434
		path = getenv("SDL_VIDEO_GL_DRIVER");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
		if ( path == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   436
			path = DEFAULT_OPENGL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   437
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   438
		handle = dlopen(path, dlopen_flags);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   439
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   440
	if ( handle == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   441
		SDL_SetError("Could not load OpenGL library");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   442
		return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   443
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   444
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   445
	/* Unload the old driver and reset the pointers */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   446
	X11_GL_UnloadLibrary(this);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   447
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   448
	/* Load new function pointers */
180
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   449
	this->gl_data->glXGetProcAddress =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   450
		(void *(*)(const GLubyte *)) dlsym(handle, "glXGetProcAddressARB");
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   451
	this->gl_data->glXChooseVisual =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   452
		(XVisualInfo *(*)(Display *, int, int *)) dlsym(handle, "glXChooseVisual");
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   453
	this->gl_data->glXCreateContext =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   454
		(GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) dlsym(handle, "glXCreateContext");
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   455
	this->gl_data->glXDestroyContext =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   456
		(void (*)(Display *, GLXContext)) dlsym(handle, "glXDestroyContext");
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   457
	this->gl_data->glXMakeCurrent =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   458
		(int (*)(Display *, GLXDrawable, GLXContext)) dlsym(handle, "glXMakeCurrent");
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   459
	this->gl_data->glXSwapBuffers =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   460
		(void (*)(Display *, GLXDrawable)) dlsym(handle, "glXSwapBuffers");
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   461
	this->gl_data->glXGetConfig =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   462
		(int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig");
638
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   463
	this->gl_data->glXQueryExtensionsString =
646
0f2029a70548 Fixed incorrect prototype for glXQueryExtensionsString()
Sam Lantinga <slouken@libsdl.org>
parents: 643
diff changeset
   464
		(const char *(*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString");
638
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   465
	
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   466
	/* We don't compare below for this in case we're not using Mesa. */
180
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   467
	this->gl_data->glXReleaseBuffersMESA =
578815880307 Do proper typecasting so this compiles on IRIX
Sam Lantinga <slouken@libsdl.org>
parents: 127
diff changeset
   468
		(void (*)(Display *, GLXDrawable)) dlsym( handle, "glXReleaseBuffersMESA" );
638
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   469
	
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   470
	
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   471
	if ( (this->gl_data->glXChooseVisual == NULL) || 
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   472
	     (this->gl_data->glXCreateContext == NULL) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   473
	     (this->gl_data->glXDestroyContext == NULL) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   474
	     (this->gl_data->glXMakeCurrent == NULL) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   475
	     (this->gl_data->glXSwapBuffers == NULL) ||
638
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   476
	     (this->gl_data->glXGetConfig == NULL) ||
b0108e9dea53 Date: Sun, 11 May 2003 19:59:06 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 566
diff changeset
   477
	     (this->gl_data->glXQueryExtensionsString == NULL)) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   478
		SDL_SetError("Could not retrieve OpenGL functions");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   479
		return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   480
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   481
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   482
	this->gl_config.dll_handle = handle;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   483
	this->gl_config.driver_loaded = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   484
	if ( path ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   485
		strncpy(this->gl_config.driver_path, path,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   486
			sizeof(this->gl_config.driver_path)-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   487
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   488
		strcpy(this->gl_config.driver_path, "");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   489
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   490
	return 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   491
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   492
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   493
void *X11_GL_GetProcAddress(_THIS, const char* proc)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   494
{
110
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   495
	static char procname[1024];
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   496
	void* handle;
110
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   497
	void* retval;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   498
	
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   499
	handle = this->gl_config.dll_handle;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   500
	if ( this->gl_data->glXGetProcAddress ) {
566
d6e7d7006062 Enable the glXGetProcAddressARB code (fixes problems with NVidia drivers)
Sam Lantinga <slouken@libsdl.org>
parents: 450
diff changeset
   501
		return this->gl_data->glXGetProcAddress(proc);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   502
	}
110
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   503
#if defined(__OpenBSD__) && !defined(__ELF__)
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   504
#undef dlsym(x,y);
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   505
#endif
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   506
	retval = dlsym(handle, proc);
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   507
	if (!retval && strlen(proc) <= 1022) {
127
0bcae11eba14 Oops, that wasn't right...
Sam Lantinga <slouken@libsdl.org>
parents: 110
diff changeset
   508
		procname[0] = '_';
110
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   509
		strcpy(procname + 1, proc);
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   510
		retval = dlsym(handle, procname);
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   511
	}
7edee9f0f2cc SDL GL dynamic loading fix for OpenBSD
Sam Lantinga <slouken@lokigames.com>
parents: 29
diff changeset
   512
	return retval;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   513
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   514
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   515
#endif /* HAVE_OPENGL */