BitmapImage
clVflip(ClCmdQueue& queue, cl::KernelFunctor& vflip,
BitmapImage& srcImg) throw (cl::Error) {
BitmapImage outImg = srcImg;
// Create the input, output image, and filter buffers!
cl::Image2D srcBuf = queue.makeImage(srcImg.getRow(0), srcImg.getWidth(),
srcImg.getHeight(), queue.ROFlags);
cl::Image2D outBuf = queue.makeImage(outImg.getRow(0), outImg.getWidth(),
outImg.getHeight(), queue.WOFlags);
// Setup sampler for source image to control sampler
cl::Sampler sampler(queue.getContext(), CL_FALSE, CL_ADDRESS_CLAMP,
CL_FILTER_NEAREST);
// Now use the OpenCl kernel to perform convolution
vflip(srcBuf, outBuf, srcImg.getWidth(), srcImg.getHeight(), sampler);
// Copy result image back from the device to host.
queue.enqueueMapImage(outBuf);
// Return the resulting image back to the caller.
return outImg;
}
BitmapImage
clRotate(ClCmdQueue& queue, cl::KernelFunctor& vrotate,
BitmapImage& srcImg, float theta) throw (cl::Error) {
// Create a new bitmap and scale it
BitmapImage outImg = srcImg;
float imgMax = sqrt(pow(srcImg.getWidth(),2) + pow(srcImg.getHeight(),2));
outImg.resize(imgMax, imgMax);
// Create the input, output image, and filter buffers!
cl::Image2D srcBuf = queue.makeImage(srcImg.getRow(0), srcImg.getWidth(),
srcImg.getHeight(), queue.ROFlags);
cl::Image2D outBuf = queue.makeImage(outImg.getRow(0), outImg.getWidth(),
outImg.getHeight(), queue.WOFlags);
// Setup sampler for source image to control sampler
cl::Sampler sampler(queue.getContext(), CL_FALSE, CL_ADDRESS_CLAMP,
CL_FILTER_NEAREST);
// Now use the OpenCl kernel to perform convolution
vrotate(srcBuf, outBuf, outImg.getWidth(), outImg.getHeight(), sampler,
(float)cos(theta), (float)sin(theta));
// Copy result image back from the device to host.
queue.enqueueMapImage(outBuf);
// Return the resulting image back to the caller.
return outImg;
}
// A simple tester for testing operation of toggling characters via OpenCL
int main(int argc, char *argv[]) {
if (argc < 4) {
std::cout << "Specify [CPU|GPU|ACC] <InputBMP> <OutputBMP> <theta_radians>\n";
return 1;
}
// Load source image from the given file
BitmapImage srcImg;
srcImg.load(argv[2]);
// Create the OpenCL command queue for a given device
ClCmdQueue queue(getDevType(argv[1]));
// Create a kernel and functor using OpenCL kernel code from a file.
cl::Kernel kernel = queue.loadKernel("batesokr_rotate.cl", "img_rotate");
cl::NDRange globalRange(srcImg.getWidth(), srcImg.getHeight());
cl::KernelFunctor vrotate(kernel, queue.getQueue(), cl::NullRange,
globalRange, cl::NullRange);
BitmapImage outImg = clRotate(queue, vrotate, srcImg, atof(argv[4])*(M_PI/180.0f));
outImg.write(argv[3]);
return 0;
}
