Dear List,
I am trying to draw an image inside QCPlugin render function without any
success.
This is my first plugin so I am new to this and OpenGL. Please note that its
a consumer plugin
- (BOOL) execute:(id<QCPlugInContext>)context atTime:(NSTimeInterval)time
withArguments:(NSDictionary*)arguments
{
CGLContextObj cgl_ctx = [context CGLContextObj];
GLint saveMode;
GLenum error;
if(cgl_ctx == NULL)
return NO;
CVImageBufferRef pixelBuffer = deckLinkController->getFrameBuffer();
// Save and set the modelview matrix.
glGetIntegerv(GL_MATRIX_MODE, &saveMode);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// Translate the matrix
glTranslatef(self.inputX, self.inputY, self.inputZ);
glScaled(self.inputWidth, self.inputHeight, 1.0);
// Rotate the matrix
glRotatef(self.inputAngle, 0.0, 1.0, 0.0);
if(pixelBuffer)
{
CIImage* image = [CIImage imageWithCVImageBuffer:pixelBuffer];
NSLog(@"%0.0f, %0.0f", [context bounds].size.width, [context
bounds].size.height);
[ciContext drawImage:image inRect:CGRectMake(0, 0, [context
bounds].size.width, [context bounds].size.height) fromRect:[image extent]];
}
// Restore the modelview matrix.
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(saveMode);
// Check for OpenGL errors and log them if there are errors.
if(error = glGetError())
[context logMessage:@"OpenGL error %04X", error];
return (error ? NO : YES);
}
I have initialized the CIContext inside startExecution function
- (BOOL) startExecution:(id<QCPlugInContext>)context
{
CGColorSpaceRef colorSpace = [context colorSpace];
ciContext = [[CIContext contextWithCGLContext:
(CGLContextObj)[context CGLContextObj]
pixelFormat:CGLGetPixelFormat([context
CGLContextObj])
options:[NSDictionary
dictionaryWithObjectsAndKeys:
(id)colorSpace,kCIContextOutputColorSpace
,
(id)colorSpace,
kCIContextWorkingColorSpace,nil]] retain];
return YES;
}
Now I am a little confused about inRect and fromRect parameters of drawImage
since the coordinate system is different and which OpenGL function should I
include or remove from this function for it to work.
I can only see a blank screen on top right corner of QC View
Please help,
Thanks
Nisar
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