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Classes/iOS/ES2Renderer.m

/*

     File: ES2Renderer.m

 Abstract: n/a

  Version: 1.7

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 redistribute this Apple software.

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 expressly stated in this notice, no other rights or licenses, express or

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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*/

#import "ES2Renderer.h"

#import <OpenGLES/ES2/gl.h>

#import <OpenGLES/ES2/glext.h>

@interface ES2Renderer (PrivateMethods)

@end

@implementation ES2Renderer

EAGLContext * m_context;

// The OpenGL names for the framebuffer and renderbuffer used to render to this view

GLuint m_colorRenderbuffer;

GLuint m_depthRenderbuffer;

// Create an ES 2.0 context

- (ES2Renderer* ) initWithContext:(EAGLContext *) context AndDrawable:(id<EAGLDrawable>)drawable

    glGenFramebuffers(1, &m_defaultFBOName);

    // Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer

    glGenRenderbuffers(1, &m_colorRenderbuffer);

    glBindFramebuffer(GL_FRAMEBUFFER, m_defaultFBOName);

    glBindRenderbuffer(GL_RENDERBUFFER, m_colorRenderbuffer);

    m_context = context;

    // This call associates the storage for the current render buffer with the EAGLDrawable (our CAEAGLLayer)

    // allowing us to draw into a buffer that will later be rendered to the screen wherever the layer is (which corresponds with our view).

    [m_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:drawable];

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, m_colorRenderbuffer);

    GLint backingWidth;

    GLint backingHeight;

    glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth);

    glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight);

    glGenRenderbuffers(1, &m_depthRenderbuffer);

    glBindRenderbuffer(GL_RENDERBUFFER, m_depthRenderbuffer);

    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, backingWidth, backingHeight);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_depthRenderbuffer);

    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)

        NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));

        return NO;

    self = [super initWithDefaultFBO:m_defaultFBOName];

    if (nil == self)

        glDeleteFramebuffers(1, &m_defaultFBOName);

        glDeleteRenderbuffers(1, &m_colorRenderbuffer);

        glDeleteRenderbuffers(1, &m_depthRenderbuffer);

    return self;

- (void)render {

    // Replace the implementation of this method to do your own custom drawing

    glBindFramebuffer(GL_FRAMEBUFFER, m_defaultFBOName);

    [super render];

    glBindRenderbuffer(GL_RENDERBUFFER, m_colorRenderbuffer);

    [m_context presentRenderbuffer:GL_RENDERBUFFER];

- (BOOL) resizeFromLayer:(CAEAGLLayer *)layer

    // The pixel dimensions of the CAEAGLLayer

    GLint backingWidth;

    GLint backingHeight;

    // Allocate color buffer backing based on the current layer size

    glBindRenderbuffer(GL_RENDERBUFFER, m_colorRenderbuffer);

    [m_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];

    glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth);

    glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight);

    glGenRenderbuffers(1, &m_depthRenderbuffer);

    glBindRenderbuffer(GL_RENDERBUFFER, m_depthRenderbuffer);

    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, backingWidth, backingHeight);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_depthRenderbuffer);

    [super resizeWithWidth:backingWidth AndHeight:backingHeight];

    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)

        NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));

        return NO;

    return YES;

- (void) dealloc

    // tear down GL

    if (m_defaultFBOName)

        glDeleteFramebuffers(1, &m_defaultFBOName);

        m_defaultFBOName = 0;

    if (m_colorRenderbuffer)

        glDeleteRenderbuffers(1, &m_colorRenderbuffer);

        m_colorRenderbuffer = 0;

    [super dealloc];

@end

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