src/video/uikit/SDL_uikitopengles.m
author Holmes Futrell <hfutrell@umail.ucsb.edu>
Wed, 13 Aug 2008 20:56:21 +0000
branchgsoc2008_iphone
changeset 2416 d92493ff1b51
parent 2403 e9a1eed243c9
child 2444 bf7028ffbf07
permissions -rw-r--r--
Fixed a bug where bad access would occur if UIKIT_MakeCurrent is passed NULL for the parameter 'SDL_GLContext context'. Instead, it clears the current context.
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/*
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 SDL - Simple DirectMedia Layer
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 Copyright (C) 1997-2006 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,
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 but WITHOUT ANY WARRANTY; without even the implied warranty of
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 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
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 License along with this library; if not, write to the Free Software
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 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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eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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#include "SDL_uikitopengles.h"
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#include "SDL_uikitopenglview.h"
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#include "SDL_uikitappdelegate.h"
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#include "SDL_uikitwindow.h"
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#include "jump.h"
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#include "SDL_sysvideo.h"
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#include "SDL_loadso.h"
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#include <dlfcn.h>
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static int UIKit_GL_Initialize(_THIS);
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eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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void *
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UIKit_GL_GetProcAddress(_THIS, const char *proc)
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{	
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	/* Look through all SO's for the proc symbol.  Here's why:
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	   -Looking for the path to the OpenGL Library seems not to work in the iPhone Simulator.
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	   -We don't know that the path won't change in the future.
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	*/
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    return SDL_LoadFunction(RTLD_DEFAULT, proc);
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}
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/*
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	note that SDL_GL_Delete context makes it current without passing the window
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*/
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int UIKit_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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	if (context) {
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		SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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		[data->view setCurrentContext];
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	}
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	else {
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		[EAGLContext setCurrentContext: nil];
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	}
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    return 0;
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}
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eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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int
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UIKit_GL_LoadLibrary(_THIS, const char *path)
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{
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	/* shouldn't be passing a path into this function */
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    if (path != NULL) {
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		SDL_SetError("iPhone GL Load Library just here for compatibility");
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		return -1;
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    }
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    return 0;
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}
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void UIKit_GL_SwapWindow(_THIS, SDL_Window * window)
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{
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	SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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	if (nil == data->view) {
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		return;
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    80
	}
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    81
	[data->view swapBuffers];
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    82
	/* since now we've got something to draw
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    83
	   make the window visible */
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    84
	[data->uiwindow makeKeyAndVisible];
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    85
eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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    86
	/* we need to let the event cycle run, or the OS won't update the OpenGL view! */
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    87
	SDL_PumpEvents();
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    88
	
eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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    89
}
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    90
eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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    91
SDL_GLContext UIKit_GL_CreateContext(_THIS, SDL_Window * window)
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    92
{
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    93
	
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    94
	SDL_uikitopenglview *view;
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    95
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    96
	SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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    97
	
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    98
	view = [[SDL_uikitopenglview alloc] initWithFrame: [[UIScreen mainScreen] applicationFrame] \
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    99
									retainBacking: _this->gl_config.retained_backing \
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   100
									rBits: _this->gl_config.red_size \
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   101
									gBits: _this->gl_config.green_size \
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   102
									bBits: _this->gl_config.blue_size \
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   103
									aBits: _this->gl_config.alpha_size \
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   104
									depthBits: _this->gl_config.depth_size];
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   105
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   106
	view.multipleTouchEnabled = YES;
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   107
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   108
	data->view = view;
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   109
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   110
	[data->uiwindow addSubview: view ];
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   111
	
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   112
	/* Don't worry, the window retained the view */
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   113
	[view release];
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   114
	
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   115
	if ( UIKit_GL_MakeCurrent(_this, window, NULL) < 0 ) {
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   116
        UIKit_GL_DeleteContext(_this, NULL);
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   117
        return NULL;
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   118
    }
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   119
		
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   120
	return view;
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   121
}
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   122
eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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   123
void UIKit_GL_DeleteContext(_THIS, SDL_GLContext context)
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   124
{
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   125
	/* the delegate has retained the view, this will release him */
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   126
	SDL_uikitopenglview *view = (SDL_uikitopenglview *)context;
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   127
	/* this will also delete it */
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   128
	[view removeFromSuperview];
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   129
	
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   130
	return;
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   131
}
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   132
eb828d6c3efb SDL_uikitopengles is responsible for OpenGLES related functions in the UIKit video driver. The main thing to note is UIKit_GL_CreateContext which creates an instance of the SDL_uikitopenglview class, an OpenGL ES View. Most the real functionality is in SDL_uikitopenglview.
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   133