i am trying to play QCComposition in CAOpenGLLayer
Sorry for the earlier post here is the snippet of the code
According to the documentation of QCrenderer this should work fine.
but at final output nothing is displayed. Can anyone tell me where i
am going wrong.
- (id) init
{
self = [super init];
if (self != nil) {
[self setAsynchronous:YES];
}
return self;
}
- (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask
{
CGLPixelFormatAttribute attributes[] = {
kCGLPFADisplayMask, mask,
kCGLPFAAccelerated,
kCGLPFAColorSize, 2,
kCGLPFAAlphaSize, 8,
kCGLPFADepthSize, 16,
kCGLPFANoRecovery,
kCGLPFAMultisample,
kCGLPFASupersample,
kCGLPFASampleAlpha,
0
};
CGLPixelFormatObj pixelFormatObj = NULL;
GLint numPixelFormats = 0;
CGLChoosePixelFormat(attributes, &pixelFormatObj, &numPixelFormats);
if (pixelFormatObj == NULL)
NSLog(@"Error: Could not choose pixel format!");
return pixelFormatObj;
}
- (void)releaseCGLPixelFormat:(CGLPixelFormatObj)pixelFormat
{
CGLDestroyPixelFormat(pixelFormat);
}
- (CGLContextObj)copyCGLContextForPixelFormat:
(CGLPixelFormatObj)pixelFormat
{
CGLContextObj object = [super
copyCGLContextForPixelFormat:pixelFormat];
NSString *path = [[NSBundle mainBundle] pathForResource:@"Blob"
ofType:@"qtz"];
QCComposition *aComposition = [QCComposition compositionWithFile:path];
CGColorSpaceRef colorRef =
CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
qcRenderer = [[QCRenderer alloc] initWithCGLContext:object
pixelFormat:pixelFormat colorSpace:colorRef composition:aComposition];
return object;
}
- (BOOL)canDrawInCGLContext:(CGLContextObj)glContext pixelFormat:
(CGLPixelFormatObj)pixelFormat forLayerTime:
(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp
{
BOOL success = [self renderAtTime:timeStamp];
if (texture)
CVOpenGLBufferRelease(texture);
texture = [qcRenderer createSnapshotImageOfType:@"CVOpenGLBuffer"];
if (texture)
return YES;
else return NO;
return success;
}
- (BOOL) renderAtTime:(const CVTimeStamp*)time
{
NSTimeInterval videoTime;
if (time) {
videoTime = (NSTimeInterval)time->videoTime / (NSTimeInterval)time-
>videoTimeScale;
NSLog(@"%f %f %f",videoTime,time->videoTime,time-
>videoRefreshPeriod);
return [qcRenderer renderAtTime:videoTime arguments:nil];
}
else
NO;
}
- (void)drawInCGLContext:(CGLContextObj)glContext pixelFormat:
(CGLPixelFormatObj)pixelFormat forLayerTime:
(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp
{
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (CFGetTypeID(texture) == CVOpenGLTextureGetTypeID()) {
GLenum target = CVOpenGLTextureGetTarget(texture);
GLint name = CVOpenGLTextureGetName(texture);
GLfloat topLeft[2], topRight[2], bottomRight[2], bottomLeft[2];
CVOpenGLTextureGetCleanTexCoords(texture, bottomLeft, bottomRight,
topRight, topLeft);
glPushMatrix();
glColor4f(1.0f, 1.0f, 1.0f, 1.0);
glEnable(target);
glBindTexture(target, name);
glBegin(GL_QUADS);
glTexCoord2fv(bottomLeft); glVertex2i(-1, -1);
glTexCoord2fv(topLeft); glVertex2i(-1, 1);
glTexCoord2fv(topRight); glVertex2i( 1, 1);
glTexCoord2fv(bottomRight); glVertex2i( 1, -1);
glEnd();
glDisable(target);
glPopMatrix();
}
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
[super drawInCGLContext:glContext pixelFormat:pixelFormat
forLayerTime:timeInterval displayTime:timeStamp];
}
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