src/video/maccommon/SDL_macgl.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 05 Jan 2004 01:34:34 +0000
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Date: Mon, 5 Jan 2004 00:09:36 +0100 From: Anders_F_Bj?rklund Subject: [SDL] Dynamic OpenGL lib support for Mac Here's a patch that adds LoadLibrary and GetProcAddress to the Carbon macintosh driver (for Mac OS 9 and Mac OS X): http://www.algonet.se/~afb/SDL-1.2.6-macdynamicgl.patch It just calls the corresponding function from SDL_loadso. It also fixes one Mac bug in SDL_loadso.c, that made it fail always when loading a library, and fixes the screen update after receiving an update event - which caused the OpenGL context to be overwritten by a blank window by UpdateRect...
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 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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/* AGL implementation of SDL OpenGL support */
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#include "SDL_error.h"
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#include "SDL_lowvideo.h"
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#include "SDL_macgl_c.h"
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#include "SDL_loadso.h"
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/* krat: adding OpenGL support */
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int Mac_GL_Init(_THIS)
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{
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#ifdef HAVE_OPENGL
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	AGLPixelFormat format;
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   	int i = 0;
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	GLint attributes [ 24 ]; /* 24 is max possible in this setup */
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	GLboolean noerr;
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	attributes[i++] = AGL_RGBA;
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	if ( this->gl_config.red_size   != 0 &&
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	     this->gl_config.blue_size  != 0 &&
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	     this->gl_config.green_size != 0 ) {
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		attributes[i++] = AGL_RED_SIZE;
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		attributes[i++] = this->gl_config.red_size;
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		attributes[i++] = AGL_GREEN_SIZE;
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		attributes[i++] = this->gl_config.green_size;
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		attributes[i++] = AGL_BLUE_SIZE;
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		attributes[i++] = this->gl_config.blue_size;
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		attributes[i++] = AGL_ALPHA_SIZE;
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		attributes[i++] = this->gl_config.alpha_size;
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	}
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	if ( this->gl_config.double_buffer ) {
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		attributes[i++] = AGL_DOUBLEBUFFER;
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	}
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	if ( this->gl_config.depth_size != 0 ) {
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		attributes[i++] = AGL_DEPTH_SIZE;
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		attributes[i++] = this->gl_config.depth_size;
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	}	
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	if ( this->gl_config.stencil_size != 0 ) {
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		attributes[i++] = AGL_STENCIL_SIZE;
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		attributes[i++] = this->gl_config.stencil_size;
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	}
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	if ( this->gl_config.accum_red_size   != 0 &&
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	     this->gl_config.accum_blue_size  != 0 &&
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	     this->gl_config.accum_green_size != 0 ) {
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		attributes[i++] = AGL_ACCUM_RED_SIZE;
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		attributes[i++] = this->gl_config.accum_red_size;
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		attributes[i++] = AGL_ACCUM_GREEN_SIZE;
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		attributes[i++] = this->gl_config.accum_green_size;
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		attributes[i++] = AGL_ACCUM_BLUE_SIZE;
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		attributes[i++] = this->gl_config.accum_blue_size;
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		attributes[i++] = AGL_ACCUM_ALPHA_SIZE;
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		attributes[i++] = this->gl_config.accum_alpha_size;
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	}
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	if ( this->gl_config.stereo ) {
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		attributes[i++] = AGL_STEREO;
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	}
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#if defined(AGL_SAMPLE_BUFFERS_ARB) && defined(AGL_SAMPLES_ARB)
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	if ( this->gl_config.multisamplebuffers != 0 ) {
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		attributes[i++] = AGL_SAMPLE_BUFFERS_ARB;
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		attributes[i++] = this->gl_config.multisamplebuffers;
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	}	
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	if ( this->gl_config.multisamplesamples != 0 ) {
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		attributes[i++] = AGL_SAMPLES_ARB;
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		attributes[i++] = this->gl_config.multisamplesamples;
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	}	
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#endif
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	attributes[i++] = AGL_ALL_RENDERERS;
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	attributes[i]	= AGL_NONE;
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	format = aglChoosePixelFormat(NULL, 0, attributes);
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	if ( format == NULL ) {
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		SDL_SetError("Couldn't match OpenGL desired format");
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		return(-1);
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	}
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	glContext = aglCreateContext(format, NULL);
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	if ( glContext == NULL ) {
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		SDL_SetError("Couldn't create OpenGL context");
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		return(-1);
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	}
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	aglDestroyPixelFormat(format);
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    #if  TARGET_API_MAC_CARBON
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    noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window));
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    #else
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	noerr = aglSetDrawable(glContext, (AGLDrawable)SDL_Window);
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    #endif
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	if(!noerr) {
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		SDL_SetError("Unable to bind GL context to window");
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		return(-1);
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	}
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	return(0);
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#else
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	SDL_SetError("OpenGL support not configured");
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	return(-1);
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#endif
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}
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void Mac_GL_Quit(_THIS)
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{
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#ifdef HAVE_OPENGL
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	if ( glContext != NULL ) {
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		aglSetCurrentContext(NULL);
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		aglSetDrawable(glContext, NULL);
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		aglDestroyContext(glContext);		
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		glContext = NULL;
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	}
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#endif
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}
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#ifdef HAVE_OPENGL
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/* Make the current context active */
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int Mac_GL_MakeCurrent(_THIS)
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{
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	int retval;
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	retval = 0;
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	if( ! aglSetCurrentContext(glContext) ) {
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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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	return(retval);
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}
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void Mac_GL_SwapBuffers(_THIS)
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{
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	aglSwapBuffers(glContext);
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}
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774
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int Mac_GL_LoadLibrary(_THIS, const char *location)
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{
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	if (location == NULL)
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		location = "OpenGLLibrary";
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	this->hidden->libraryHandle = SDL_LoadObject(location);
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	this->gl_config.driver_loaded = 1;
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	return (this->hidden->libraryHandle != NULL) ? 0 : -1;
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}
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void Mac_GL_UnloadLibrary(_THIS)
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{
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	SDL_UnloadObject(this->hidden->libraryHandle);
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	this->hidden->libraryHandle = NULL;
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	this->gl_config.driver_loaded = 0;
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}
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void* Mac_GL_GetProcAddress(_THIS, const char *proc)
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{
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	return SDL_LoadFunction( this->hidden->libraryHandle, proc );
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}
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0
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#endif /* HAVE_OPENGL */
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