__global__ void writeToPBO(uchar4* devPtr,bool levelSet1)
{
	// map from threadIdx/BlockIdx to pixel position
	int x = threadIdx.x + blockIdx.x * blockDim.x;
	int y = threadIdx.y + blockIdx.y * blockDim.y;
	int offset = x + y * blockDim.x * gridDim.x;

	float val;
	if(levelSet1)
	{
		val = tex2D(texLevelSet1,x,y);
	}
	else
	{
		val = tex2D(texLevelSet2,x,y);
	}

	float color;
	if(isInNarrowBand(val))
		color = 255.0f;

	for (int py = 0; py<grid_pixel_width; py++)
	{
		for (int px = 0; px < grid_pixel_width; px++)
		{
			devPtr[x*grid_pixel_width + px + y*grid_pixel_width*grid_pixel_width*width + py*grid_pixel_width*width].x = color;
			devPtr[x*grid_pixel_width + px + y*grid_pixel_width*grid_pixel_width*width + py*grid_pixel_width*width].y = color;
			devPtr[x*grid_pixel_width + px + y*grid_pixel_width*grid_pixel_width*width + py*grid_pixel_width*width].z = color;
			devPtr[x*grid_pixel_width + px + y*grid_pixel_width*grid_pixel_width*width + py*grid_pixel_width*width].w = 255;

		}
	}
}