nuclear@0: //
nuclear@0: //  ES1Renderer.m
nuclear@0: //  istereo
nuclear@0: //
nuclear@0: //  Created by nuclear on 9/6/11.
nuclear@0: //  Copyright __MyCompanyName__ 2011. All rights reserved.
nuclear@0: //
nuclear@0: 
nuclear@0: #import "ES1Renderer.h"
nuclear@0: 
nuclear@0: @implementation ES1Renderer
nuclear@0: 
nuclear@0: // Create an OpenGL ES 1.1 context
nuclear@0: - (id)init
nuclear@0: {
nuclear@0:     if ((self = [super init]))
nuclear@0:     {
nuclear@0:         context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
nuclear@0: 
nuclear@0:         if (!context || ![EAGLContext setCurrentContext:context])
nuclear@0:         {
nuclear@0:             [self release];
nuclear@0:             return nil;
nuclear@0:         }
nuclear@0: 
nuclear@0:         // Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer
nuclear@0:         glGenFramebuffersOES(1, &defaultFramebuffer);
nuclear@0:         glGenRenderbuffersOES(1, &colorRenderbuffer);
nuclear@0:         glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer);
nuclear@0:         glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
nuclear@0:         glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, colorRenderbuffer);
nuclear@0:     }
nuclear@0: 
nuclear@0:     return self;
nuclear@0: }
nuclear@0: 
nuclear@0: - (void)render
nuclear@0: {
nuclear@0:     // Replace the implementation of this method to do your own custom drawing
nuclear@0: 
nuclear@0:     static const GLfloat squareVertices[] = {
nuclear@0:         -0.5f,  -0.33f,
nuclear@0:          0.5f,  -0.33f,
nuclear@0:         -0.5f,   0.33f,
nuclear@0:          0.5f,   0.33f,
nuclear@0:     };
nuclear@0: 
nuclear@0:     static const GLubyte squareColors[] = {
nuclear@0:         255, 255,   0, 255,
nuclear@0:         0,   255, 255, 255,
nuclear@0:         0,     0,   0,   0,
nuclear@0:         255,   0, 255, 255,
nuclear@0:     };
nuclear@0: 
nuclear@0:     static float transY = 0.0f;
nuclear@0: 
nuclear@0:     // This application only creates a single context which is already set current at this point.
nuclear@0:     // This call is redundant, but needed if dealing with multiple contexts.
nuclear@0:     [EAGLContext setCurrentContext:context];
nuclear@0: 
nuclear@0:     // This application only creates a single default framebuffer which is already bound at this point.
nuclear@0:     // This call is redundant, but needed if dealing with multiple framebuffers.
nuclear@0:     glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer);
nuclear@0:     glViewport(0, 0, backingWidth, backingHeight);
nuclear@0: 
nuclear@0:     glMatrixMode(GL_PROJECTION);
nuclear@0:     glLoadIdentity();
nuclear@0:     glMatrixMode(GL_MODELVIEW);
nuclear@0:     glLoadIdentity();
nuclear@0:     glTranslatef(0.0f, (GLfloat)(sinf(transY)/2.0f), 0.0f);
nuclear@0:     transY += 0.075f;
nuclear@0: 
nuclear@0:     glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
nuclear@0:     glClear(GL_COLOR_BUFFER_BIT);
nuclear@0: 
nuclear@0:     glVertexPointer(2, GL_FLOAT, 0, squareVertices);
nuclear@0:     glEnableClientState(GL_VERTEX_ARRAY);
nuclear@0:     glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors);
nuclear@0:     glEnableClientState(GL_COLOR_ARRAY);
nuclear@0: 
nuclear@0:     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
nuclear@0: 
nuclear@0:     // This application only creates a single color renderbuffer which is already bound at this point.
nuclear@0:     // This call is redundant, but needed if dealing with multiple renderbuffers.
nuclear@0:     glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
nuclear@0:     [context presentRenderbuffer:GL_RENDERBUFFER_OES];
nuclear@0: }
nuclear@0: 
nuclear@0: - (BOOL)resizeFromLayer:(CAEAGLLayer *)layer
nuclear@0: {	
nuclear@0:     // Allocate color buffer backing based on the current layer size
nuclear@0:     glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
nuclear@0:     [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:layer];
nuclear@0:     glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
nuclear@0:     glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
nuclear@0: 
nuclear@0:     if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES)
nuclear@0:     {
nuclear@0:         NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
nuclear@0:         return NO;
nuclear@0:     }
nuclear@0: 
nuclear@0:     return YES;
nuclear@0: }
nuclear@0: 
nuclear@0: - (void)dealloc
nuclear@0: {
nuclear@0:     // Tear down GL
nuclear@0:     if (defaultFramebuffer)
nuclear@0:     {
nuclear@0:         glDeleteFramebuffersOES(1, &defaultFramebuffer);
nuclear@0:         defaultFramebuffer = 0;
nuclear@0:     }
nuclear@0: 
nuclear@0:     if (colorRenderbuffer)
nuclear@0:     {
nuclear@0:         glDeleteRenderbuffersOES(1, &colorRenderbuffer);
nuclear@0:         colorRenderbuffer = 0;
nuclear@0:     }
nuclear@0: 
nuclear@0:     // Tear down context
nuclear@0:     if ([EAGLContext currentContext] == context)
nuclear@0:         [EAGLContext setCurrentContext:nil];
nuclear@0: 
nuclear@0:     [context release];
nuclear@0:     context = nil;
nuclear@0: 
nuclear@0:     [super dealloc];
nuclear@0: }
nuclear@0: 
nuclear@0: @end