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OpenGLES2DView.m：源码内容

							//
//  OpenGLES2DView.m
//  GLFun
//
//  Created by Jeff LaMarche on 8/5/08.
//  Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import "OpenGLES2DView.h"
@implementation OpenGLES2DView
+ (Class) layerClass
{
	return [CAEAGLLayer class];
}
#pragma mark -
- (BOOL)createFramebuffer {
	
	glGenFramebuffersOES(1, &viewFramebuffer);
	glGenRenderbuffersOES(1, &viewRenderbuffer);
	
	glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
	glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
	[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
	glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
	
	glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
	glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
	
	if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
		NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
		return NO;
	}
	
	return YES;
}
- (id)initWithCoder:(NSCoder*)coder
{
	if((self = [super initWithCoder:coder])) {
		// Get the layer
		CAEAGLLayer *eaglLayer = (CAEAGLLayer*) self.layer;
		eaglLayer.opaque = YES;
		eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
										[NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGB565, kEAGLDrawablePropertyColorFormat, nil];
		context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
		
		if(!context || ![EAGLContext setCurrentContext:context] || ![self createFramebuffer]) {
			[self release];
			return nil;
		}
		
		glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
		glViewport(0, 0, backingWidth, backingHeight);
		
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		glOrthof(0, self.frame.size.width, 0, self.frame.size.height, -1, 1);
		glMatrixMode(GL_MODELVIEW);
		glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT);
		glEnableClientState (GL_VERTEX_ARRAY);
		glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
		[context presentRenderbuffer:GL_RENDERBUFFER_OES];
		
		
		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
		glEnable(GL_TEXTURE_2D);
		glEnableClientState(GL_VERTEX_ARRAY);
		
	}
	
	return self;
}
- (void)dealloc {
	[super dealloc];
}
@end

						