I am trying to play QCComposition in CAOpenGLLayer
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...?
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];
}
Thanks !
Anshul
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