added cuda lexer and removed example from c++ samples

samples/C++/cuda.cu

@@ -1,39 +0,0 @@
-void foo()
-{
-  cudaArray* cu_array;
-  texture<float, 2, cudaReadModeElementType> tex;
-
-  // Allocate array
-  cudaChannelFormatDesc description = cudaCreateChannelDesc<float>();
-  cudaMallocArray(&cu_array, &description, width, height);
-
-  // Copy image data to array
-  cudaMemcpyToArray(cu_array, image, width*height*sizeof(float), cudaMemcpyHostToDevice);
-
-  // Set texture parameters (default)
-  tex.addressMode[0] = cudaAddressModeClamp;
-  tex.addressMode[1] = cudaAddressModeClamp;
-  tex.filterMode = cudaFilterModePoint;
-  tex.normalized = false; // do not normalize coordinates
-
-  // Bind the array to the texture
-  cudaBindTextureToArray(tex, cu_array);
-
-  // Run kernel
-  dim3 blockDim(16, 16, 1);
-  dim3 gridDim((width + blockDim.x - 1)/ blockDim.x, (height + blockDim.y - 1) / blockDim.y, 1);
-  kernel<<< gridDim, blockDim, 0 >>>(d_data, height, width);
-
-  // Unbind the array from the texture
-  cudaUnbindTexture(tex);
-} //end foo()
-
-__global__ void kernel(float* odata, int height, int width)
-{
-   unsigned int x = blockIdx.x*blockDim.x + threadIdx.x;
-   unsigned int y = blockIdx.y*blockDim.y + threadIdx.y;
-   if (x < width && y < height) {
-      float c = tex2D(tex, x, y);
-      odata[y*width+x] = c;
-   }
-}