How to use textures and arrays in CUDA?

How to use arrays of Textures in CUDA

• I was trying to use an array of textures in CUDA but I'm getting an "invalid texture reference" error. Anyone has any idea how to implement array of textures? #include<iostream> #include<cstdio> #include<cstdlib> #define MAX_TEXTURE 134217728 #define MAX_LENGTH 268435456 using namespace std; texture<char, 1, cudaReadModeElementType> texref[2]; int main(){ // host variable char *text; // device variable char *dev_a; text = (char*)malloc(MAX_LENGTH*sizeof(char)); // any initial value for(int i=0; i<MAX_LENGTH; i++) text[i] = 'a'; cudaMalloc((void**)&dev_a, MAX_LENGTH*sizeof(char)); cudaMemcpy(dev_a, text, MAX_LENGTH*sizeof(char), cudaMemcpyHostToDevice); cudaError_t err = cudaBindTexture(0, texref[0], dev_a, MAX_TEXTURE*sizeof(char)); cout << cudaGetErrorString(err) << endl; size_t offset = MAX_TEXTURE; err = cudaBindTexture(&offset, texref[1], dev_a, MAX_TEXTURE*sizeof(char)); cout << cudaGetErrorString(err) << endl; cudaFree(dev_a); free(text); return 0; }

• Answer:

  This is not possible. If available to you (Kepler or Maxwell gpu and cuda 5.0 or later), you should try http://devblogs.nvidia.com/parallelforall/cuda-pro-tip-kepler-texture-objects-improve-performance-and-flexibility/. In my code I faked the array by using a function to access various texture references with something similar to the following (in a header file): texture<char, 1, cudaReadModeElementType> tex0; texture<char, 1, cudaReadModeElementType> tex1; // ... texture<char, 1, cudaReadModeElementType> getTexture( int id ) { if( id == 0 ) return tex0; else if( id == 1 ) return tex1; // ... } As far as I know there is no way to avoid listing all the texture<char, 1, cudaReadModeElementType> texX; explicitly and be aware that texture references are declared at file scope. Probably you can improve my code snippet by using preprocessor macros...