SDL_macgl.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* AGL implementation of SDL OpenGL support */
#include "SDL_lowvideo.h"
#include "SDL_macgl_c.h"
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#include "SDL_loadso.h"
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/* krat: adding OpenGL support */
int Mac_GL_Init(_THIS)
{
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#if SDL_VIDEO_OPENGL
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AGLPixelFormat format;
int i = 0;
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GLint attributes [ 26 ]; /* 26 is max possible in this setup */
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GLboolean noerr;
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/* load the gl driver from a default path */
if ( ! this->gl_config.driver_loaded ) {
/* no driver has been loaded, use default (ourselves) */
if ( Mac_GL_LoadLibrary(this, NULL) < 0 ) {
return(-1);
}
}
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attributes[i++] = AGL_RGBA;
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;
}
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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;
}
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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;
}
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if ( this->gl_config.stereo ) {
attributes[i++] = AGL_STEREO;
}
#if defined(AGL_SAMPLE_BUFFERS_ARB) && defined(AGL_SAMPLES_ARB)
if ( this->gl_config.multisamplebuffers != 0 ) {
attributes[i++] = AGL_SAMPLE_BUFFERS_ARB;
attributes[i++] = this->gl_config.multisamplebuffers;
}
if ( this->gl_config.multisamplesamples != 0 ) {
attributes[i++] = AGL_SAMPLES_ARB;
attributes[i++] = this->gl_config.multisamplesamples;
}
#endif
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if ( this->gl_config.accelerated > 0 ) {
attributes[i++] = AGL_ACCELERATED;
attributes[i++] = AGL_NO_RECOVERY;
}
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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
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noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window));
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#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)
{
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#if SDL_VIDEO_OPENGL
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if ( glContext != NULL ) {
aglSetCurrentContext(NULL);
aglSetDrawable(glContext, NULL);
aglDestroyContext(glContext);
glContext = NULL;
}
#endif
}
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#if SDL_VIDEO_OPENGL
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/* 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);
}
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int Mac_GL_LoadLibrary(_THIS, const char *location)
{
if (location == NULL)
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#if __MACH__
location = "/System/Library/Frameworks/OpenGL.framework/OpenGL";
#else
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location = "OpenGLLibrary";
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this->hidden->libraryHandle = SDL_LoadObject(location);
this->gl_config.driver_loaded = 1;
return (this->hidden->libraryHandle != NULL) ? 0 : -1;
}
void Mac_GL_UnloadLibrary(_THIS)
{
SDL_UnloadObject(this->hidden->libraryHandle);
this->hidden->libraryHandle = NULL;
this->gl_config.driver_loaded = 0;
}
void* Mac_GL_GetProcAddress(_THIS, const char *proc)
{
return SDL_LoadFunction( this->hidden->libraryHandle, proc );
}
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#endif /* SDL_VIDEO_OPENGL */