codebase / stimlib

  #include <assert.h>
  #include <cuda.h>
  #include <cuda_runtime.h>
  #include <stdio.h>
  #include <stim/visualization/colormap.h>
  #include <sstream>
  #include <stim/math/vector.h>
  #include <stim/cuda/cudatools/devices.h>
  #include <stim/cuda/cudatools/threads.h>
  #include <stim/cuda/cuda_texture.cuh>
  	stim::cuda::cuda_texture tx;  //texture object.
  	float* print;
  	
  	///Initialization function, allocates the memory and passes the necessary
  	///handles from OpenGL and Cuda.
  	///@param DIM_Y			--integer controlling how much memory to allocate.

  	void initArray(int x, int y)

  	{

  			cudaMalloc( (void**) &print, x*y*sizeof(float));     ///temporary

  	}
  
  	///Deinit function that frees the memery used and releases the texture resource
  	///back to OpenGL.
  	void cleanUP()
  	{
  			cudaFree(print);         ///temporary
  	}  

  
          __device__
          float templ(int x)                                                                      
          {
                  if(x < 16/6 || x > 16*5/6 || (x > 16*2/6 && x < 16*4/6)){
                          return 1.0;
                  }else{
                          return 0.0;
                  }
  
          }

  		
  	///Find the difference of the given set of samples and the template
  	///using cuda acceleration.
  	///@param stim::cuda::cuda_texture t	--stim texture that holds all the references
  	///					  to the data.
  	///@param float* result			--a pointer to the memory that stores the result.
  	__global__
  	//void get_diff (float *result)
  	void get_diff (cudaTextureObject_t texIn, float *print)
  	{       
  		int x   = threadIdx.x + blockIdx.x * blockDim.x;
  		int y   = threadIdx.y + blockIdx.y * blockDim.y;

  		int idx = y*64+x;
  //		int idx = y*32+x;
  //		int idx = y*16+x;

  		float valIn             = tex2D<unsigned char>(texIn, x, y);

  		float templa		= templ(x);

  		print[idx]              = valIn;             ///temporary
  		//print[idx]              = abs(templa);             ///temporary

  
  	}
  
  
  	///External access-point to the cuda function
  	///@param GLuint texbufferID 	--GLtexture (most be contained in a framebuffer object)
  	///				  that holds the data that will be handed to cuda.
  	///@param GLenum texType	--either GL_TEXTURE_1D, GL_TEXTURE_2D or GL_TEXTURE_3D
  	///				  may work with other gl texture types, but untested.
  	///@param DIM_Y, the number of samples in the template.

  	void test(GLint texbufferID, GLenum texType, int x, int y)

  	{
  
  		//Bind the Texture in GL and allow access to cuda.
  		tx.MapCudaTexture(texbufferID, texType);
  
  		//initialize the return arrays.
  

  		initArray(x,y);
  		dim3 numBlocks(1, y);
  		dim3 threadsPerBlock(x, 1);

  		int max_threads = stim::maxThreadsPerBlock();

  		//dim3 threads(max_threads, 1);
  		//dim3 blocks(x / threads.x + 1, y);	

  		//dim3 numBlocks(2, 2);
  		//dim3 threadsPerBlock(8, 108);

  
  
  //		get_diff <<< blocks, threads >>> (tx.getTexture(), print);
  		get_diff <<< numBlocks, threadsPerBlock >>> (tx.getTexture(), print);
  
  		cudaDeviceSynchronize();
  		stringstream name;      //for debugging
  		name << "FromTex.bmp";

  		stim::gpu2image<float>(print, name.str(),x,y,0,255);

  	  
  		tx.UnmapCudaTexture();
  		cleanUP();
  	}