CUDA 一维纹理的创建和使用测试

先直接贴上总代码

` include "cuda_runtime.h" #include "device_launch_parameters.h" #include "cuda.h" #include using std::cout; using std::endl; #define arrayNum 100 texture<float, cudaTextureType1D, cudaReadModeElementType> tex1DTest; cudaArray* gputexArray = NULL; void Bind1DTex() { tex1DTest.normalized = true; tex1DTest.filterMode = cudaFilterModeLinear; tex1DTest.addressMode[0] = cudaAddressModeClamp;

float testArray[arrayNum];

for (int i = 0; i < arrayNum; i++)
	testArray[i] = i;

cudaChannelFormatDesc ChannelDesc = cudaCreateChannelDesc<float>();

if (gputexArray == NULL)
	cudaMallocArray(&gputexArray, &ChannelDesc, arrayNum, 1);

cudaMemcpyToArray(gputexArray, 0, 0, testArray, arrayNum * sizeof(float), cudaMemcpyHostToDevice);
cudaBindTextureToArray(tex1DTest, gputexArray, ChannelDesc);

} global void cudaTest(float c) { int i = threadIdx.x; c[i] = tex1D(tex1DTest, (float)(i+0.5)/(float)arrayNum); } int main() { float dev_c = 0; float c = 0; c = (float)malloc(arrayNum * sizeof(float)); cudaMalloc((void)&dev_c, arrayNum * sizeof(float)); Bind1DTex(); cudaTest << <1, arrayNum >> >(dev_c);

cudaMemcpy(c, dev_c, arrayNum * sizeof(float), cudaMemcpyDeviceToHost);
for (int i = 0;i < arrayNum;i++) {
	cout << c[i] << endl;
}

system("pause");
return 0;

} ` 有个细节需要注意一下：

c[i] = tex1D(tex1DTest, (float)(i+0.5)/(float)arrayNum); 采样纹理的时候需要加个0.5的偏置，否则我们采样到的结果就是：0 0.5 1.5 2.5 ...

而加上0.5的偏置以后，采样结果就是：0 1 2 3 4 ...了