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GLAirPlay/GLView.m

/*

     File: GLView.m

 Abstract: The OpenGL ES view which renders a rotating cube. Responsible for creating a CADisplayLink for the new target display when a connection/disconnection occurs.

  Version: 1.0

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*/

#import <OpenGLES/ES2/gl.h>

#import <OpenGLES/ES2/glext.h>

#import <QuartzCore/QuartzCore.h>

#import "GLView.h"

#import "CubePlayback.h"

#define BUFFER_OFFSET(i) ((char *)NULL + (i))

GLfloat gCubeVertexData[216] =

    // Data layout for each line below is:

    // positionX, positionY, positionZ,     normalX, normalY, normalZ,

    0.5f, -0.5f, -0.5f,        1.0f, 0.0f, 0.0f,

    0.5f, 0.5f, -0.5f,         1.0f, 0.0f, 0.0f,

    0.5f, -0.5f, 0.5f,         1.0f, 0.0f, 0.0f,

    0.5f, -0.5f, 0.5f,         1.0f, 0.0f, 0.0f,

    0.5f, 0.5f, -0.5f,          1.0f, 0.0f, 0.0f,

    0.5f, 0.5f, 0.5f,         1.0f, 0.0f, 0.0f,

    0.5f, 0.5f, -0.5f,         0.0f, 1.0f, 0.0f,

    -0.5f, 0.5f, -0.5f,        0.0f, 1.0f, 0.0f,

    0.5f, 0.5f, 0.5f,          0.0f, 1.0f, 0.0f,

    0.5f, 0.5f, 0.5f,          0.0f, 1.0f, 0.0f,

    -0.5f, 0.5f, -0.5f,        0.0f, 1.0f, 0.0f,

    -0.5f, 0.5f, 0.5f,         0.0f, 1.0f, 0.0f,

    -0.5f, 0.5f, -0.5f,        -1.0f, 0.0f, 0.0f,

    -0.5f, -0.5f, -0.5f,       -1.0f, 0.0f, 0.0f,

    -0.5f, 0.5f, 0.5f,         -1.0f, 0.0f, 0.0f,

    -0.5f, 0.5f, 0.5f,         -1.0f, 0.0f, 0.0f,

    -0.5f, -0.5f, -0.5f,       -1.0f, 0.0f, 0.0f,

    -0.5f, -0.5f, 0.5f,        -1.0f, 0.0f, 0.0f,

    -0.5f, -0.5f, -0.5f,       0.0f, -1.0f, 0.0f,

    0.5f, -0.5f, -0.5f,        0.0f, -1.0f, 0.0f,

    -0.5f, -0.5f, 0.5f,        0.0f, -1.0f, 0.0f,

    -0.5f, -0.5f, 0.5f,        0.0f, -1.0f, 0.0f,

    0.5f, -0.5f, -0.5f,        0.0f, -1.0f, 0.0f,

    0.5f, -0.5f, 0.5f,         0.0f, -1.0f, 0.0f,

    0.5f, 0.5f, 0.5f,          0.0f, 0.0f, 1.0f,

    -0.5f, 0.5f, 0.5f,         0.0f, 0.0f, 1.0f,

    0.5f, -0.5f, 0.5f,         0.0f, 0.0f, 1.0f,

    0.5f, -0.5f, 0.5f,         0.0f, 0.0f, 1.0f,

    -0.5f, 0.5f, 0.5f,         0.0f, 0.0f, 1.0f,

    -0.5f, -0.5f, 0.5f,        0.0f, 0.0f, 1.0f,

    0.5f, -0.5f, -0.5f,        0.0f, 0.0f, -1.0f,

    -0.5f, -0.5f, -0.5f,       0.0f, 0.0f, -1.0f,

    0.5f, 0.5f, -0.5f,         0.0f, 0.0f, -1.0f,

    0.5f, 0.5f, -0.5f,         0.0f, 0.0f, -1.0f,

    -0.5f, -0.5f, -0.5f,       0.0f, 0.0f, -1.0f,

    -0.5f, 0.5f, -0.5f,        0.0f, 0.0f, -1.0f

};

static double GetTimeMS()

    return (CACurrentMediaTime()*1000.0);

@interface GLView ()

    NSInteger _animationFrameInterval;

    CADisplayLink *_displayLink;

    UIScreen *_targetScreen;

    EAGLContext *_context;

    // The pixel dimensions of the CAEAGLLayer

    GLint _backingWidth;

    GLint _backingHeight;

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

    GLuint _defaultFramebuffer, _colorRenderbuffer;

    // The OpenGL frame for the depth buffer

    GLuint _depthRenderbuffer;

    GLuint _vertexArray;

    GLuint _vertexBuffer;

    float _rotation;

    float _radius;

    double _renderTime;

    BOOL _zeroDeltaTime;

@property (nonatomic, strong) GLKBaseEffect *effect;

// OpenAL playback is wired up in the storyboard scene

@property (nonatomic, strong) IBOutlet CubePlayback *playback;

@end

@implementation GLView

+ (Class)layerClass

    return [CAEAGLLayer class];

// The GL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:

- (id)initWithCoder:(NSCoder*)coder

    if ((self = [super initWithCoder:coder]))

        // Get the layer

        CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;

        eaglLayer.opaque = TRUE;

        eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:

                                        [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];

        _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

        if (!_context || ![EAGLContext setCurrentContext:_context])

            return nil;

        [self setupGL];

        _animating = FALSE;

        _animationFrameInterval = 1;

        _displayLink = nil;

        _zeroDeltaTime = TRUE;

    return self;

- (void)setupGL

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

    glGenFramebuffers(1, &_defaultFramebuffer);

    glGenRenderbuffers(1, &_colorRenderbuffer);

    glBindFramebuffer(GL_FRAMEBUFFER, _defaultFramebuffer);

    glBindRenderbuffer(GL_RENDERBUFFER, _colorRenderbuffer);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, _colorRenderbuffer);

    // Create a depth buffer as we want to enalbe GL_DEPTH_TEST in this sample

    glGenRenderbuffers(1, &_depthRenderbuffer);

    // Create a GLKBaseEffect to render the object

    self.effect = [[GLKBaseEffect alloc] init];

    self.effect.light0.enabled = GL_TRUE;

    self.effect.light0.diffuseColor = GLKVector4Make(1.0f, 0.4f, 0.4f, 1.0f);

    glEnable(GL_DEPTH_TEST);

    // Create a VAO that stores the cube vertex and normal data

    glGenVertexArraysOES(1, &_vertexArray);

    glBindVertexArrayOES(_vertexArray);

    glGenBuffers(1, &_vertexBuffer);

    glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);

    glBufferData(GL_ARRAY_BUFFER, sizeof(gCubeVertexData), gCubeVertexData, GL_STATIC_DRAW);

    glEnableVertexAttribArray(GLKVertexAttribPosition);

    glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 24, BUFFER_OFFSET(0));

    glEnableVertexAttribArray(GLKVertexAttribNormal);

    glVertexAttribPointer(GLKVertexAttribNormal, 3, GL_FLOAT, GL_FALSE, 24, BUFFER_OFFSET(12));

    glBindVertexArrayOES(0);

- (void)drawView:(id)sender

    double currentTime = GetTimeMS();

    double deltaTime = _zeroDeltaTime ? 0.0 : currentTime - _renderTime;

    _renderTime = currentTime;

    if (_zeroDeltaTime)

        _zeroDeltaTime = FALSE;

    // Update animation states

    if (self.userControlDelegate)

        _radius = [self.userControlDelegate rotatingRadius];

    _rotation += deltaTime * 0.05 * M_PI / 180.0;

    // Update OpenGL

    [EAGLContext setCurrentContext:_context];

    glBindFramebuffer(GL_FRAMEBUFFER, _defaultFramebuffer);

    glViewport(0, 0, _backingWidth, _backingHeight);

    glClearColor(0.65f, 0.65f, 0.65f, 1.0f);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBindVertexArrayOES(_vertexArray);

    // Compute the projection matrix

    float aspect = (GLfloat)_backingWidth / (GLfloat)_backingHeight;

    GLKMatrix4 projectionMatrix = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(65.0f), aspect, 0.1f, 100.0f);

    self.effect.transform.projectionMatrix = projectionMatrix;

    // Compute the model view matrix

    GLKMatrix4 baseModelViewMatrix = GLKMatrix4MakeTranslation(0.0f, 0.0f, -4.0f);

    baseModelViewMatrix = GLKMatrix4Rotate(baseModelViewMatrix, _rotation, 0.0f, 1.0f, 0.0f);

    GLKMatrix4 modelViewMatrix = GLKMatrix4MakeTranslation(0.0f, 0.0f, -fabs(_radius));

    modelViewMatrix = GLKMatrix4Rotate(modelViewMatrix, _rotation, 1.0f, 1.0f, 1.0f);

    modelViewMatrix = GLKMatrix4Multiply(baseModelViewMatrix, modelViewMatrix);

    self.effect.transform.modelviewMatrix = modelViewMatrix;

    // Render the object with GLKit

    [self.effect prepareToDraw];

    glDrawArrays(GL_TRIANGLES, 0, 36);

    glBindRenderbuffer(GL_RENDERBUFFER, _colorRenderbuffer);

    [_context presentRenderbuffer:GL_RENDERBUFFER];

    // Update OpenAL playback

    // cube's current position

    GLKVector4 pos = GLKVector4Make(0.0f, 0.0f, 0.0f, 1.0f);

    pos = GLKMatrix4MultiplyVector4(modelViewMatrix, pos);

    // source

    float *s = pos.v;

    [self.playback setSourcePos:s];

    // listener

    float l[] = { 1.0f, 0.0f, -4.0f };

    [self.playback setListenerPos:l];

    [self.playback setListenerRotation:-M_PI_2]; //points inwards to the screen

- (BOOL)resizeFromLayer

    CAEAGLLayer *layer = (CAEAGLLayer*)self.layer;

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

    glBindRenderbuffer(GL_RENDERBUFFER, _colorRenderbuffer);

    [_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer];

    glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &_backingWidth);

    glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &_backingHeight);

    // Allocate storage for the depth buffer, and attach it to the framebuffer’s depth attachment point

    glBindRenderbuffer(GL_RENDERBUFFER, _depthRenderbuffer);

    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, _backingWidth, _backingHeight);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, _depthRenderbuffer);

    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)

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

        return NO;

    return YES;

- (void)layoutSubviews

    if ([self resizeFromLayer])

        // An external display might just have been connected/disconnected. We do not want to

        // consider time spent in the connection/disconnection in the animation.

        _zeroDeltaTime = TRUE;

        [self drawView:nil];

#pragma Display Link

- (NSInteger)animationFrameInterval

    return _animationFrameInterval;

- (void)setAnimationFrameInterval:(NSInteger)frameInterval

    // Frame interval defines how many display frames must pass between each time the

    // display link fires. The display link will only fire 30 times a second when the

    // frame internal is two on a display that refreshes 60 times a second. The default

    // frame interval setting of one will fire 60 times a second when the display refreshes

    // at 60 times a second. A frame interval setting of less than one results in undefined

    // behavior.

    if (frameInterval >= 1)

        _animationFrameInterval = frameInterval;

        if (_animating)

            [self stopAnimation];

            [self startAnimation];

- (UIScreen *)targetScreen

    return _targetScreen;

- (void)setTargetScreen:(UIScreen *)screen

    if (_targetScreen != screen)

        _targetScreen = screen;

        if (_animating)

            [self stopAnimation];

            [self startAnimation];

- (void)startAnimation

    if (!_animating)

        if (self.targetScreen) {

            // Create a CADisplayLink for the target display.

            // This will result in the native fps for whatever display you create it from.

            _displayLink = [self.targetScreen displayLinkWithTarget:self selector:@selector(drawView:)];

        else {

            // Fall back to use CADislayLink's class method.

            // A CADisplayLink created using the class method is always bound to the internal display.

            _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(drawView:)];

        [_displayLink setFrameInterval:self.animationFrameInterval];

        [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

        // Start playing sound if not already

        if (!self.playback.isPlaying)

            [self.playback startSound];

        // An external display might just have been connected/disconnected. We do not want to

        // consider time spent in the connection/disconnection in the animation.

        _zeroDeltaTime = TRUE;

        _animating = TRUE;

- (void)stopAnimation

    if (_animating)

        [_displayLink invalidate];

        _displayLink = nil;

        // Stop playing sound if currently playing

        if (self.playback.isPlaying)

            [self.playback stopSound];

        _animating = FALSE;

- (void)dealloc

    // tear down OpenGL

    if (_defaultFramebuffer)

        glDeleteFramebuffers(1, &_defaultFramebuffer);

        _defaultFramebuffer = 0;

    if (_colorRenderbuffer)

        glDeleteRenderbuffers(1, &_colorRenderbuffer);

        _colorRenderbuffer = 0;

    glDeleteBuffers(1, &_vertexBuffer);

    glDeleteVertexArraysOES(1, &_vertexArray);

    // tear down context

    if ([EAGLContext currentContext] == _context)

        [EAGLContext setCurrentContext:nil];

@end

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