/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

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

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@libsdl.org

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/* AGL implementation of SDL OpenGL support */

#include "SDL_error.h"

#include "SDL_lowvideo.h"

#include "SDL_macgl_c.h"

/* krat: adding OpenGL support */

int Mac_GL_Init(_THIS)

{

#ifdef HAVE_OPENGL

AGLPixelFormat format;

int i = 0;

GLint attributes [ 24 ]; /* 24 is max possible in this setup */

GLboolean noerr;

attributes[i++] = AGL_RGBA;

if ( this->gl_config.double_buffer ) {

attributes[i++] = AGL_DOUBLEBUFFER;

}

if ( this->gl_config.depth_size != 0 ) {

attributes[i++] = AGL_DEPTH_SIZE;

attributes[i++] = this->gl_config.depth_size;

}

if ( this->gl_config.red_size != 0 &&

this->gl_config.blue_size != 0 &&

this->gl_config.green_size != 0 ) {

attributes[i++] = AGL_RED_SIZE;

attributes[i++] = this->gl_config.red_size;

attributes[i++] = AGL_GREEN_SIZE;

attributes[i++] = this->gl_config.green_size;

attributes[i++] = AGL_BLUE_SIZE;

attributes[i++] = this->gl_config.blue_size;

attributes[i++] = AGL_ALPHA_SIZE;

attributes[i++] = this->gl_config.alpha_size;

}

if ( this->gl_config.stencil_size != 0 ) {

attributes[i++] = AGL_STENCIL_SIZE;

attributes[i++] = this->gl_config.stencil_size;

}

if ( this->gl_config.accum_red_size != 0 &&

this->gl_config.accum_blue_size != 0 &&

this->gl_config.accum_green_size != 0 ) {

attributes[i++] = AGL_ACCUM_RED_SIZE;

attributes[i++] = this->gl_config.accum_red_size;

attributes[i++] = AGL_ACCUM_GREEN_SIZE;

attributes[i++] = this->gl_config.accum_green_size;

attributes[i++] = AGL_ACCUM_BLUE_SIZE;

attributes[i++] = this->gl_config.accum_blue_size;

attributes[i++] = AGL_ACCUM_ALPHA_SIZE;

attributes[i++] = this->gl_config.accum_alpha_size;

}

attributes[i++] = AGL_ALL_RENDERERS;

attributes[i] = AGL_NONE;

format = aglChoosePixelFormat(NULL, 0, attributes);

if ( format == NULL ) {

SDL_SetError("Couldn't match OpenGL desired format");

return(-1);

}

glContext = aglCreateContext(format, NULL);

if ( glContext == NULL ) {

SDL_SetError("Couldn't create OpenGL context");

return(-1);

}

aglDestroyPixelFormat(format);

#if TARGET_API_MAC_CARBON

noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window));

#else

noerr = aglSetDrawable(glContext, (AGLDrawable)SDL_Window);

#endif

if(!noerr) {

SDL_SetError("Unable to bind GL context to window");

return(-1);

}

return(0);

#else

SDL_SetError("OpenGL support not configured");

return(-1);

#endif

}

void Mac_GL_Quit(_THIS)

{

#ifdef HAVE_OPENGL

if ( glContext != NULL ) {

aglSetCurrentContext(NULL);

aglSetDrawable(glContext, NULL);

aglDestroyContext(glContext);

glContext = NULL;

}

#endif

}

#ifdef HAVE_OPENGL

/* Make the current context active */

int Mac_GL_MakeCurrent(_THIS)

{

int retval;

retval = 0;

if( ! aglSetCurrentContext(glContext) ) {

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

retval = -1;

}

return(retval);

}

void Mac_GL_SwapBuffers(_THIS)

{

aglSwapBuffers(glContext);

}

#endif /* HAVE_OPENGL */