testKernel.cuh
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#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()
{
cudaMalloc( (void**) &print, 216*16*sizeof(float)); ///temporary
}
///Deinit function that frees the memery used and releases the texture resource
///back to OpenGL.
void cleanUP()
{
cudaFree(print); ///temporary
}
///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*16+x;
float valIn = tex2D<unsigned char>(texIn, x, y)/255.0;
print[idx] = abs(valIn); ///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.
extern "C"
void test(GLint texbufferID, GLenum texType)
{
//Bind the Texture in GL and allow access to cuda.
tx.MapCudaTexture(texbufferID, texType);
//initialize the return arrays.
initArray();
int x = 16;
int y = 27*8;
int max_threads = stim::maxThreadsPerBlock();
dim3 threads(max_threads, 1);
dim3 blocks(x / threads.x +1, y);
//dim3 numBlocks(1, 1);
//dim3 threadsPerBlock(16, 216);
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(),16,216,0,1);
tx.UnmapCudaTexture();
cleanUP();
}