public MultiViewAccumulation()
{
ViewsPerFrame = SampleCount;
SampleCount = 1;
MaxIterations = TotalSampleCount;
// TODO: support creating samples for a cropped aperture (hexagon etc.)
unitDiskSamples = sampler.CreateLensSamplesFloat(SqrtMaxTotalSampleCount, true).ToArray();
Accumulate = true;
}
private void GenerateLensSamplesTextures(int textureId, int totalSampleCount, int tileSize)
{
// size of a group of samples for a single pixel
int bands = 2;
int textureSize = bands * totalSampleCount * tileSize * tileSize;
//IEnumerable<Vector2d> samples = GenerateLensSamples(tileSize, (int)Math.Sqrt(MaxTotalSampleCount)).GetEnumerator();
int sqrtTotalSampleCount = (int)Math.Sqrt(totalSampleCount);
Vector2[, ,] samples = new Vector2[tileSize, tileSize, totalSampleCount];
Sampler sampler = new Sampler();
for (int y = 0; y < tileSize; y++)
{
for (int x = 0; x < tileSize; x++)
{
IEnumerable <Vector2> pixelSamples = sampler.CreateLensSamplesFloat(sqrtTotalSampleCount, ShuffleLensSamples);
int z = 0;
foreach (Vector2 sample in pixelSamples)
{
samples[x, y, z] = sample;
z++;
}
}
}
GL.BindTexture(TextureTarget.Texture3D, textureId);
IntPtr texturePtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Half)) * textureSize);
unsafe
{
int zStride = bands * tileSize * tileSize;
for (int y = 0; y < tileSize; y++)
{
for (int x = 0; x < tileSize; x++)
{
Half *row = (Half *)texturePtr + bands * (y * tileSize + x);
int index = 0;
// Z dimension
for (int sample = 0; sample < totalSampleCount; sample++)
{
Vector2 lensPos = samples[x, y, sample];
row[index] = (Half)lensPos.X;
row[index + 1] = (Half)lensPos.Y;
index += zStride;
}
}
}
}
// TODO: could be an half float or unsigned byte instead of a float
// TODO: two sample pair could be stored in one 4-channel value
GL.TexImage3D(TextureTarget.Texture3D, 0, PixelInternalFormat.Rg16f,
tileSize, tileSize, totalSampleCount, 0,
PixelFormat.Rg, PixelType.HalfFloat, texturePtr);
Marshal.FreeHGlobal(texturePtr);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureWrapR, (int)TextureWrapMode.Clamp);
}
private void GenerateLensSamplesTextures(int textureId, int totalSampleCount, int tileSize)
{
// size of a group of samples for a single pixel
int bands = 2;
int textureSize = bands * totalSampleCount * tileSize * tileSize;
//IEnumerable<Vector2d> samples = GenerateLensSamples(tileSize, (int)Math.Sqrt(MaxTotalSampleCount)).GetEnumerator();
int sqrtTotalSampleCount = (int)Math.Sqrt(totalSampleCount);
Vector2[, ,] samples = new Vector2[tileSize, tileSize, totalSampleCount];
Sampler sampler = new Sampler();
for (int y = 0; y < tileSize; y++)
{
for (int x = 0; x < tileSize; x++)
{
IEnumerable<Vector2> pixelSamples = sampler.CreateLensSamplesFloat(sqrtTotalSampleCount, ShuffleLensSamples);
int z = 0;
foreach (Vector2 sample in pixelSamples)
{
samples[x, y, z] = sample;
z++;
}
}
}
GL.BindTexture(TextureTarget.Texture3D, textureId);
IntPtr texturePtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Half)) * textureSize);
unsafe
{
int zStride = bands * tileSize * tileSize;
for (int y = 0; y < tileSize; y++)
{
for (int x = 0; x < tileSize; x++)
{
Half* row = (Half*)texturePtr + bands * (y * tileSize + x);
int index = 0;
// Z dimension
for (int sample = 0; sample < totalSampleCount; sample++)
{
Vector2 lensPos = samples[x, y, sample];
row[index] = (Half)lensPos.X;
row[index + 1] = (Half)lensPos.Y;
index += zStride;
}
}
}
}
// TODO: could be an half float or unsigned byte instead of a float
// TODO: two sample pair could be stored in one 4-channel value
GL.TexImage3D(TextureTarget.Texture3D, 0, PixelInternalFormat.Rg16f,
tileSize, tileSize, totalSampleCount, 0,
PixelFormat.Rg, PixelType.HalfFloat, texturePtr);
Marshal.FreeHGlobal(texturePtr);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture3D, TextureParameterName.TextureWrapR, (int)TextureWrapMode.Clamp);
}
