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    NSMutableDictionary *slice_textures = [NSMutableDictionary dictionaryWithCapacity:3];
    size_t total_files = 100;
    view.progressbar.progress = 0.;
    float step = 1. / total_files;

    EAGLContext *context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
    if (context == nil) {
        NSLog(@"Failed to create ES context");
    }
    dispatch_queue_t queue = dispatch_queue_create("org.denter.smile.loadpvr", DISPATCH_QUEUE_SERIAL);

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    __block NSMutableDictionary *slice_textures = [NSMutableDictionary dictionaryWithCapacity:3];
    __block EAGLContext *context;

    dispatch_queue_t queue = dispatch_queue_create("org.denter.smile.loadpvr", DISPATCH_QUEUE_SERIAL);
    dispatch_async(queue, ^{
        context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
        [EAGLContext setCurrentContext:context];
        
        for (... resource in resources) {
            LoadResourceAndStoreHandleInDict(slice_textures);

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Ld /Users/dennda/Library/Developer/Xcode/DerivedData/Smile-ctljjdgnzgigebcutxqrjlaxzfmp/Build/Products/Debug-iphoneos/smile.app/smile normal armv7
    cd /Users/dennda/dev/msc/pocs/VolVis
    setenv IPHONEOS_DEPLOYMENT_TARGET 5.0
    setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/clang -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -L/Users/dennda/Library/Developer/Xcode/DerivedData/Smile-ctljjdgnzgigebcutxqrjlaxzfmp/Build/Products/Debug-iphoneos -L/Users/dennda/dev/msc/pocs/VolVis -F/Users/dennda/Library/Developer/Xcode/DerivedData/Smile-ctljjdgnzgigebcutxqrjlaxzfmp/Build/Products/Debug-iphoneos -filelist /Users/dennda/Library/Developer/Xcode/DerivedData/Smile-ctljjdgnzgigebcutxqrjlaxzfmp/Build/Intermediates/Smile.build/Debug-iphoneos/Smile.build/Objects-normal/armv7/smile.LinkFileList -dead_strip -ObjC -fobjc-arc -miphoneos-version

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#import <OpenGLES/ES2/gl.h>
#import "error.h"

#ifdef DEBUG
    inline void          	oglActiveTexture (GLenum texture) {
        GetError(); 	 glActiveTexture(texture); }
    inline void          	oglAttachShader (GLuint program, GLuint shader) {
        GetError(); 	 glAttachShader(program, shader); }
    inline void          	oglBindAttribLocation (GLuint program, GLuint index, const GLchar* name) {
        GetError(); 	 glBindAttribLocation (program, index, name); }

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#ifdef DEBUG
	GL_API void         GL_APIENTRY 	oglActiveTexture (GLenum texture) {
			    GetError(); 	 glActiveTexture(texture); }
	GL_API void         GL_APIENTRY 	oglAttachShader (GLuint program, GLuint shader) {
			    GetError(); 	 glAttachShader(program, shader); }
	GL_API void         GL_APIENTRY 	oglBindAttribLocation (GLuint program, GLuint index, const GLchar* name) {
			    GetError(); 	 glBindAttribLocation (program, index, name); }
	GL_API void         GL_APIENTRY 	oglBindBuffer (GLenum target, GLuint buffer) {
			    GetError(); 	 glBindBuffer (target, buffer); }
	GL_API void         GL_APIENTRY 	oglBindFramebuffer (GLenum target, GLuint framebuffer) {

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    UIBezierPath *path = [UIBezierPath bezierPath];
    
    for (TFPointView *pv in subviews) {
        if (pv == [subviews objectAtIndex:0])
            [path moveToPoint:pv.center];
        else
            [path addLineToPoint:pv.center];
    }
    [path stroke];

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- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    // Extend our own touch hit zone by 22 pixels to the top. The implementation of this
    // function relies on the fact that this view spreads out from 0 to win.width and
    // from 0 to the bottom of the window.
    CGFloat min_touchable2 = 44./2.;
    if (point.y >= -min_touchable2)
        return YES;
    return NO;
}

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...

   [self.view.layer.presentationLayer addObserver:self
                                        forKeyPath:@"frame"
                                           options:NSKeyValueObservingOptionNew
                                           context:NULL];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    NSLog(@"Keyvalue change with keypath: %@, object: %@", keyPath, object);

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    displayLink = [CADisplayLink displayLinkWithTarget:self
                                              selector:@selector(updateAndDrawViews:)];
    [displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

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    int tf_tex_unit = 1;
    glActiveTexture(GL_TEXTURE0 + tf_tex_unit);
    glBindTexture(GL_TEXTURE_2D, _tf_texname);
    glUniform1i(_uniforms[TF_TEX], tf_tex_unit);