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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 /* AGL implementation of SDL OpenGL support */
     25 
     26 #include "SDL_lowvideo.h"
     27 #include "SDL_macgl_c.h"
     28 #include "SDL_loadso.h"
     29 
     30 
     31 /* krat: adding OpenGL support */
     32 int Mac_GL_Init(_THIS)
     33 {
     34 #if SDL_VIDEO_OPENGL
     35 	AGLPixelFormat format;
     36    	int i = 0;
     37 	GLint attributes [ 26 ]; /* 26 is max possible in this setup */
     38 	GLboolean noerr;
     39 
     40 	/* load the gl driver from a default path */
     41 	if ( ! this->gl_config.driver_loaded ) {
     42 		/* no driver has been loaded, use default (ourselves) */
     43 		if ( Mac_GL_LoadLibrary(this, NULL) < 0 ) {
     44 			return(-1);
     45 		}
     46 	}
     47 
     48 	attributes[i++] = AGL_RGBA;
     49 	if ( this->gl_config.red_size   != 0 &&
     50 	     this->gl_config.blue_size  != 0 &&
     51 	     this->gl_config.green_size != 0 ) {
     52 		attributes[i++] = AGL_RED_SIZE;
     53 		attributes[i++] = this->gl_config.red_size;
     54 		attributes[i++] = AGL_GREEN_SIZE;
     55 		attributes[i++] = this->gl_config.green_size;
     56 		attributes[i++] = AGL_BLUE_SIZE;
     57 		attributes[i++] = this->gl_config.blue_size;
     58 		attributes[i++] = AGL_ALPHA_SIZE;
     59 		attributes[i++] = this->gl_config.alpha_size;
     60 	}
     61 	if ( this->gl_config.double_buffer ) {
     62 		attributes[i++] = AGL_DOUBLEBUFFER;
     63 	}
     64 	if ( this->gl_config.depth_size != 0 ) {
     65 		attributes[i++] = AGL_DEPTH_SIZE;
     66 		attributes[i++] = this->gl_config.depth_size;
     67 	}
     68 	if ( this->gl_config.stencil_size != 0 ) {
     69 		attributes[i++] = AGL_STENCIL_SIZE;
     70 		attributes[i++] = this->gl_config.stencil_size;
     71 	}
     72 	if ( this->gl_config.accum_red_size   != 0 &&
     73 	     this->gl_config.accum_blue_size  != 0 &&
     74 	     this->gl_config.accum_green_size != 0 ) {
     75 
     76 		attributes[i++] = AGL_ACCUM_RED_SIZE;
     77 		attributes[i++] = this->gl_config.accum_red_size;
     78 		attributes[i++] = AGL_ACCUM_GREEN_SIZE;
     79 		attributes[i++] = this->gl_config.accum_green_size;
     80 		attributes[i++] = AGL_ACCUM_BLUE_SIZE;
     81 		attributes[i++] = this->gl_config.accum_blue_size;
     82 		attributes[i++] = AGL_ACCUM_ALPHA_SIZE;
     83 		attributes[i++] = this->gl_config.accum_alpha_size;
     84 	}
     85 	if ( this->gl_config.stereo ) {
     86 		attributes[i++] = AGL_STEREO;
     87 	}
     88 #if defined(AGL_SAMPLE_BUFFERS_ARB) && defined(AGL_SAMPLES_ARB)
     89 	if ( this->gl_config.multisamplebuffers != 0 ) {
     90 		attributes[i++] = AGL_SAMPLE_BUFFERS_ARB;
     91 		attributes[i++] = this->gl_config.multisamplebuffers;
     92 	}
     93 	if ( this->gl_config.multisamplesamples != 0 ) {
     94 		attributes[i++] = AGL_SAMPLES_ARB;
     95 		attributes[i++] = this->gl_config.multisamplesamples;
     96 	}
     97 #endif
     98 	if ( this->gl_config.accelerated > 0 ) {
     99 		attributes[i++] = AGL_ACCELERATED;
    100 		attributes[i++] = AGL_NO_RECOVERY;
    101 	}
    102 
    103 	attributes[i++] = AGL_ALL_RENDERERS;
    104 	attributes[i]	= AGL_NONE;
    105 
    106 	format = aglChoosePixelFormat(NULL, 0, attributes);
    107 	if ( format == NULL ) {
    108 		SDL_SetError("Couldn't match OpenGL desired format");
    109 		return(-1);
    110 	}
    111 
    112 	glContext = aglCreateContext(format, NULL);
    113 	if ( glContext == NULL ) {
    114 		SDL_SetError("Couldn't create OpenGL context");
    115 		return(-1);
    116 	}
    117 	aglDestroyPixelFormat(format);
    118 
    119     #if  TARGET_API_MAC_CARBON
    120 	noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window));
    121     #else
    122 	noerr = aglSetDrawable(glContext, (AGLDrawable)SDL_Window);
    123     #endif
    124 
    125 	if(!noerr) {
    126 		SDL_SetError("Unable to bind GL context to window");
    127 		return(-1);
    128 	}
    129 	return(0);
    130 #else
    131 	SDL_SetError("OpenGL support not configured");
    132 	return(-1);
    133 #endif
    134 }
    135 
    136 void Mac_GL_Quit(_THIS)
    137 {
    138 #if SDL_VIDEO_OPENGL
    139 	if ( glContext != NULL ) {
    140 		aglSetCurrentContext(NULL);
    141 		aglSetDrawable(glContext, NULL);
    142 		aglDestroyContext(glContext);
    143 		glContext = NULL;
    144 	}
    145 #endif
    146 }
    147 
    148 #if SDL_VIDEO_OPENGL
    149 
    150 /* Make the current context active */
    151 int Mac_GL_MakeCurrent(_THIS)
    152 {
    153 	int retval;
    154 
    155 	retval = 0;
    156 	if( ! aglSetCurrentContext(glContext) ) {
    157 		SDL_SetError("Unable to make GL context current");
    158 		retval = -1;
    159 	}
    160 	return(retval);
    161 }
    162 
    163 void Mac_GL_SwapBuffers(_THIS)
    164 {
    165 	aglSwapBuffers(glContext);
    166 }
    167 
    168 int Mac_GL_LoadLibrary(_THIS, const char *location)
    169 {
    170 	if (location == NULL)
    171 #if __MACH__
    172 		location = "/System/Library/Frameworks/OpenGL.framework/OpenGL";
    173 #else
    174 		location = "OpenGLLibrary";
    175 #endif
    176 
    177 	this->hidden->libraryHandle = SDL_LoadObject(location);
    178 
    179 	this->gl_config.driver_loaded = 1;
    180 	return (this->hidden->libraryHandle != NULL) ? 0 : -1;
    181 }
    182 
    183 void Mac_GL_UnloadLibrary(_THIS)
    184 {
    185 	SDL_UnloadObject(this->hidden->libraryHandle);
    186 
    187 	this->hidden->libraryHandle = NULL;
    188 	this->gl_config.driver_loaded = 0;
    189 }
    190 
    191 void* Mac_GL_GetProcAddress(_THIS, const char *proc)
    192 {
    193 	return SDL_LoadFunction( this->hidden->libraryHandle, proc );
    194 }
    195 
    196 #endif /* SDL_VIDEO_OPENGL */
    197 
    198