src/video/maccommon/SDL_macgl.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  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@devolution.com
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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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/* 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.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.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.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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	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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#endif /* HAVE_OPENGL */
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