/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2009 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

*/

#include "SDL_config.h"

#include "SDL_QuartzVideo.h"

/*

* GL_ARB_Multisample is supposed to be available in 10.1, according to Apple:

*

* http://developer.apple.com/graphicsimaging/opengl/extensions.html#GL_ARB_multisample

*

* ...but it isn't in the system headers, according to Sam:

*

* http://lists.libsdl.org/pipermail/sdl-libsdl.org/2003-December/039794.html

*

* These are normally enums and not #defines in the system headers.

*

* --ryan.

*/

#if (MAC_OS_X_VERSION_MAX_ALLOWED < 1020)

#define NSOpenGLPFASampleBuffers ((NSOpenGLPixelFormatAttribute) 55)

#define NSOpenGLPFASamples ((NSOpenGLPixelFormatAttribute) 56)

#endif

@implementation NSOpenGLContext (CGLContextAccess)

- (CGLContextObj) cglContext;

{

return _contextAuxiliary;

}

@end

/* OpenGL helper functions (used internally) */

int QZ_SetupOpenGL (_THIS, int bpp, Uint32 flags) {

NSOpenGLPixelFormatAttribute attr[32];

NSOpenGLPixelFormat *fmt;

int i = 0;

int colorBits = bpp;

/* if a GL library hasn't been loaded at this point, load the default. */

if (!this->gl_config.driver_loaded) {

if (QZ_GL_LoadLibrary(this, NULL) == -1)

return 0;

}

if ( flags & SDL_FULLSCREEN ) {

attr[i++] = NSOpenGLPFAFullScreen;

}

/* In windowed mode, the OpenGL pixel depth must match device pixel depth */

else if ( colorBits != device_bpp ) {

colorBits = device_bpp;

}

attr[i++] = NSOpenGLPFAColorSize;

attr[i++] = colorBits;

attr[i++] = NSOpenGLPFADepthSize;

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

if ( this->gl_config.double_buffer ) {

attr[i++] = NSOpenGLPFADoubleBuffer;

}

if ( this->gl_config.stereo ) {

attr[i++] = NSOpenGLPFAStereo;

}

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

attr[i++] = NSOpenGLPFAStencilSize;

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

}

if ( (this->gl_config.accum_red_size +

this->gl_config.accum_green_size +

this->gl_config.accum_blue_size +

this->gl_config.accum_alpha_size) > 0 ) {

attr[i++] = NSOpenGLPFAAccumSize;

attr[i++] = this->gl_config.accum_red_size + this->gl_config.accum_green_size + this->gl_config.accum_blue_size + this->gl_config.accum_alpha_size;

}

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

attr[i++] = NSOpenGLPFASampleBuffers;

attr[i++] = this->gl_config.multisamplebuffers;

}

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

attr[i++] = NSOpenGLPFASamples;

attr[i++] = this->gl_config.multisamplesamples;

attr[i++] = NSOpenGLPFANoRecovery;

}

if ( this->gl_config.accelerated > 0 ) {

attr[i++] = NSOpenGLPFAAccelerated;

}

attr[i++] = NSOpenGLPFAScreenMask;

attr[i++] = CGDisplayIDToOpenGLDisplayMask (display_id);

attr[i] = 0;

fmt = [ [ NSOpenGLPixelFormat alloc ] initWithAttributes:attr ];

if (fmt == nil) {

SDL_SetError ("Failed creating OpenGL pixel format");

return 0;

}

gl_context = [ [ NSOpenGLContext alloc ] initWithFormat:fmt

shareContext:nil];

[ fmt release ];

if (gl_context == nil) {

SDL_SetError ("Failed creating OpenGL context");

return 0;

}

/* Synchronize QZ_GL_SwapBuffers() to vertical retrace.

* (Apple's documentation is not completely clear about what this setting

* exactly does, IMHO - for a detailed explanation see

* http://lists.apple.com/archives/mac-opengl/2006/Jan/msg00080.html )

*/

if ( this->gl_config.swap_control >= 0 ) {

long value;

value = this->gl_config.swap_control;

[ gl_context setValues: &value forParameter: NSOpenGLCPSwapInterval ];

}

/*

* Wisdom from Apple engineer in reference to UT2003's OpenGL performance:

* "You are blowing a couple of the internal OpenGL function caches. This

* appears to be happening in the VAO case. You can tell OpenGL to up

* the cache size by issuing the following calls right after you create

* the OpenGL context. The default cache size is 16." --ryan.

*/

#ifndef GLI_ARRAY_FUNC_CACHE_MAX

#define GLI_ARRAY_FUNC_CACHE_MAX 284

#endif

#ifndef GLI_SUBMIT_FUNC_CACHE_MAX

#define GLI_SUBMIT_FUNC_CACHE_MAX 280

#endif

{

long cache_max = 64;

CGLContextObj ctx = [ gl_context cglContext ];

CGLSetParameter (ctx, GLI_SUBMIT_FUNC_CACHE_MAX, &cache_max);

CGLSetParameter (ctx, GLI_ARRAY_FUNC_CACHE_MAX, &cache_max);

}

/* End Wisdom from Apple Engineer section. --ryan. */

return 1;

}

void QZ_TearDownOpenGL (_THIS) {

[ NSOpenGLContext clearCurrentContext ];

[ gl_context clearDrawable ];

[ gl_context release ];

}

/* SDL OpenGL functions */

static const char *DEFAULT_OPENGL_LIB_NAME =

"/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib";

int QZ_GL_LoadLibrary (_THIS, const char *location) {

if ( gl_context != NULL ) {

SDL_SetError("OpenGL context already created");

return -1;

}

if (opengl_library != NULL)

SDL_UnloadObject(opengl_library);

if (location == NULL)

location = DEFAULT_OPENGL_LIB_NAME;

opengl_library = SDL_LoadObject(location);

if (opengl_library != NULL) {

this->gl_config.driver_loaded = 1;

return 0;

}

this->gl_config.driver_loaded = 0;

return -1;

}

void* QZ_GL_GetProcAddress (_THIS, const char *proc) {

return SDL_LoadFunction(opengl_library, proc);

}

int QZ_GL_GetAttribute (_THIS, SDL_GLattr attrib, int* value) {

GLenum attr = 0;

QZ_GL_MakeCurrent (this);

switch (attrib) {

case SDL_GL_RED_SIZE: attr = GL_RED_BITS; break;

case SDL_GL_BLUE_SIZE: attr = GL_BLUE_BITS; break;

case SDL_GL_GREEN_SIZE: attr = GL_GREEN_BITS; break;

case SDL_GL_ALPHA_SIZE: attr = GL_ALPHA_BITS; break;

case SDL_GL_DOUBLEBUFFER: attr = GL_DOUBLEBUFFER; break;

case SDL_GL_DEPTH_SIZE: attr = GL_DEPTH_BITS; break;

case SDL_GL_STENCIL_SIZE: attr = GL_STENCIL_BITS; break;

case SDL_GL_ACCUM_RED_SIZE: attr = GL_ACCUM_RED_BITS; break;

case SDL_GL_ACCUM_GREEN_SIZE: attr = GL_ACCUM_GREEN_BITS; break;

case SDL_GL_ACCUM_BLUE_SIZE: attr = GL_ACCUM_BLUE_BITS; break;

case SDL_GL_ACCUM_ALPHA_SIZE: attr = GL_ACCUM_ALPHA_BITS; break;

case SDL_GL_STEREO: attr = GL_STEREO; break;

case SDL_GL_MULTISAMPLEBUFFERS: attr = GL_SAMPLE_BUFFERS_ARB; break;

case SDL_GL_MULTISAMPLESAMPLES: attr = GL_SAMPLES_ARB; break;

case SDL_GL_BUFFER_SIZE:

{

GLint bits = 0;

GLint component;

/* there doesn't seem to be a single flag in OpenGL for this! */

glGetIntegerv (GL_RED_BITS, &component); bits += component;

glGetIntegerv (GL_GREEN_BITS,&component); bits += component;

glGetIntegerv (GL_BLUE_BITS, &component); bits += component;

glGetIntegerv (GL_ALPHA_BITS, &component); bits += component;

*value = bits;

return 0;

}

case SDL_GL_ACCELERATED_VISUAL:

{

long val;

/* FIXME: How do we get this information here?

[fmt getValues: &val forAttribute: NSOpenGLPFAAccelerated attr forVirtualScreen: 0];

*/

val = (this->gl_config.accelerated != 0);;

*value = val;

return 0;

}

case SDL_GL_SWAP_CONTROL:

{

long val;

[ gl_context getValues: &val forParameter: NSOpenGLCPSwapInterval ];

*value = val;

return 0;

}

}

glGetIntegerv (attr, (GLint *)value);

return 0;

}

int QZ_GL_MakeCurrent (_THIS) {

[ gl_context makeCurrentContext ];

return 0;

}

void QZ_GL_SwapBuffers (_THIS) {

[ gl_context flushBuffer ];

}