分類: programming

重點在於 shader code 必須是固定的，如果 filter kernel 一直改變，估計在 runtime 重新 compile shader 的時間會成為瓶頸。

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/core/ocl.hpp>
#include <time.h>

using namespace cv;
using namespace cv::ocl;

int main(int argc, char** argv)
{
	setUseOpenCL(1);
	printf("useCL %s\n", useOpenCL()?"true":"false");

    Mat img = imread(argv[1]);
    UMat mImgSource, mImgSource2, mImgResult, mImgResult2, mImgResult3;
	img.copyTo(mImgSource);

    int ksize = 200;
    RNG rng;
    while (true) {
    	clock_t t1 = clock();
    	add(mImgSource, UMat(mImgSource.size(), mImgSource.type(), Scalar( rng.uniform(0,50), rng.uniform(0,50), rng.uniform(0,50), rng.uniform(0,50) )), mImgSource2);
    	boxFilter(mImgSource2, mImgResult, -1, Size(ksize, ksize));
    	boxFilter(mImgResult, mImgResult2, -1, Size(ksize, ksize));
    	resize(mImgResult2, mImgResult3, Size(), 0.5, 0.5);
    	clock_t t2 = clock();
    	printf("%d %d\n", ksize, (int)(t2-t1));
    	imshow("img", mImgResult3);
    	int key = waitKey(1);
    	if (key > 0) break;
    }
}