gistfile1.m

- (void)drawView {
    
    
    // Replace the implementation of this method to do your own custom drawing
    
    const GLfloat squareVertices[] = {
        -0.75f, -0.75f,
        0.75f,  -0.75f,
        -0.75f,  0.75f,
        0.75f,   0.75f,
    };
    const GLubyte squareColors[] = {
        255, 255,   0, 255,
        0,   255, 255, 255,
        0,     0,   0,   0,
        255,   0, 255, 255,
    };
    
    const GLfloat texCoords[] = {
	0.0f, 1.0f,
	1.0f, 1.0f,
	0.0f, 0.0f,
	1.0f, 0.0f,
    };
    
    [EAGLContext setCurrentContext:context];

    if (!rendered) {
        init_scene();

	glGenTextures(1, texids);
	glBindTexture(GL_TEXTURE_2D, texids[0]);
	
	render(renderImage, WIDTH, HEIGHT, NSUBSAMPLES);

	// Load rendered image into texture memory.
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, renderImage);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	
	rendered = 1;
    }
    
    glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
    glViewport(0, 0, backingWidth, backingHeight);
    
    glBindTexture(GL_TEXTURE_2D, texids[0]);
    glEnable(GL_TEXTURE_2D);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrthof(-1.0f, 1.0f, -1.5f, 1.5f, -1.0f, 1.0f);
    glMatrixMode(GL_MODELVIEW);
    glRotatef(0.5f, 0.0f, 0.0f, 1.0f);
    
    glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
    
    glVertexPointer(2, GL_FLOAT, 0, squareVertices);
    glEnableClientState(GL_VERTEX_ARRAY);
    //glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors);
    //glEnableClientState(GL_COLOR_ARRAY);
    glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    
    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
    [context presentRenderbuffer:GL_RENDERBUFFER_OES];
}