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@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 */
32int 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
136void 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 */
151int 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
163void Mac_GL_SwapBuffers(_THIS)
164{
165	aglSwapBuffers(glContext);
166}
167
168int 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
183void 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
191void* 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