/// <summary>
/// Sets the argument of the kernel's
/// </summary>
/// <param name="kernel">Name of the kernel to set the paramter of</param>
/// <param name="argIndex">Index of argument to set</param>
/// <param name="value">Value of argument</param>
public void SetKernelArg <T>(string kernel, uint argIndex, GPUBuffer <T> buffer) where T : struct
{
_error = Cl.SetKernelArg(_kernels[kernel], argIndex, buffer.BufferHandle);
CLException.CheckException(_error);
}
/// <summary>
/// Renders a frame
/// </summary>
/// <param name="camera">Camera to render from</param>
/// <param name="spheres">List of Spheres to render</param>
/// <param name="disks">List of Disks to render</param>
/// <param name="elapsedTime">Out variable of the elapsed time it took to render frame in seconds</param>
/// <returns>The rendered frame</returns>
public Image renderImage(Camera camera, Sphere[] spheres, Disk[] disks, out double elapsedTime)
{
var stopwatch = new Stopwatch();
stopwatch.Start();
int localSize = 64;
int totalPixels = _width * _height;
int globalSize = ((int)Math.Ceiling((float)totalPixels / localSize)) * localSize;
//Must be float4 because of padding
float4[] pixels = new float4[totalPixels];
_imgBuffer = new GPUBuffer <float4>(_gpuHandle, MemFlags.WriteOnly, totalPixels);
_sphereBuffer = new GPUBuffer <Sphere>(_gpuHandle, MemFlags.ReadOnly | MemFlags.AllocHostPtr, spheres.Length);
_diskBuffer = new GPUBuffer <Disk>(_gpuHandle, MemFlags.ReadOnly | MemFlags.AllocHostPtr, disks.Length);
_sphereBuffer.WriteData(spheres);
_diskBuffer.WriteData(disks);
//Set Arguments
_renderProgram.SetKernelArg("render", 0, _width);
_renderProgram.SetKernelArg("render", 1, _height);
_renderProgram.SetKernelArg("render", 2, _imgBuffer);
_renderProgram.SetKernelArg("render", 3, _sphereBuffer);
_renderProgram.SetKernelArg("render", 4, spheres.Length);
_renderProgram.SetKernelArg("render", 5, _diskBuffer);
_renderProgram.SetKernelArg("render", 6, disks.Length);
_renderProgram.SetKernelArg("render", 7, camera);
_renderProgram.SetKernelArg("render", 8, _backgroundImage);
//Run Kernal
_renderProgram.ExecuteKernel1D("render", globalSize, localSize);
_gpuHandle.WaitUntilDone();
//Read data
_imgBuffer.ReadData(pixels);
//Write data to bmp
int[] pixelBytes = new int[_width * _height];
for (int x = 0; x < _width; x++)
{
for (int y = 0; y < _height; y++)
{
pixelBytes[(y * _width) + x] = ((255 << 24) |
(byte)(pixels[(y * _width) + x].x * 255) << 16 |
(byte)(pixels[(y * _width) + x].y * 255) << 08 |
(byte)(pixels[(y * _width) + x].z * 255));
}
}
if (_handle.IsAllocated)
{
_handle.Free();
}
_handle = GCHandle.Alloc(pixelBytes, GCHandleType.Pinned);
Bitmap bmp = new Bitmap(_width, _height, _width * 4,
PixelFormat.Format32bppArgb, _handle.AddrOfPinnedObject());
_imgBuffer.Dispose();
pixels = null;
pixelBytes = null;
//Compute end time
stopwatch.Stop();
elapsedTime = (stopwatch.ElapsedMilliseconds) / 1000.0;
return(bmp);
}
