static GraphicsTextureView CreateTexture3DView(GraphicsCopyContext copyContext, GraphicsTexture texture3D, GraphicsBuffer uploadBuffer)
{
var uploadBufferView = uploadBuffer.CreateBufferView <byte>(checked ((uint)texture3D.ByteLength));
var textureDataSpan = uploadBufferView.Map <byte>();
{
var width = texture3D.PixelWidth;
var height = texture3D.PixelHeight;
var bytesPerRow = texture3D.BytesPerRow;
var depth = texture3D.PixelDepth;
var bytesPerLayer = texture3D.BytesPerLayer;
for (var z = 0u; z < depth; z++)
{
var layerIndex = z * bytesPerLayer;
for (var y = 0u; y < height; y++)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
for (var x = 0u; x < width; x++)
{
var red = x * 256u / width;
var blue = y * 256u / height;
var green = z * 256u / depth;
var alpha = 0xFFu;
row[x] = (alpha << 24) | (green << 16) | (blue << 8) | (red << 0);
}
}
}
}
uploadBufferView.UnmapAndWrite();
var texture3DView = texture3D.CreateView(0, 1);
copyContext.Copy(texture3DView, uploadBufferView);
return(texture3DView);
}
static GraphicsTextureView CreateTexture2DView(GraphicsCopyContext copyContext, GraphicsTexture texture2D, GraphicsBuffer uploadBuffer)
{
var uploadBufferView = uploadBuffer.CreateBufferView <byte>(checked ((uint)texture2D.ByteLength));
var textureDataSpan = uploadBufferView.Map <byte>();
{
var width = texture2D.PixelWidth;
var height = texture2D.PixelHeight;
var bytesPerRow = texture2D.BytesPerRow;
var cellWidth = width / 8;
var cellHeight = height / 8;
for (var y = 0u; y < height; y++)
{
var rowIndex = y * bytesPerRow;
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
for (var x = 0u; x < width; x++)
{
if ((x / cellWidth % 2) == (y / cellHeight % 2))
{
row[x] = 0xFF000000;
}
else
{
row[x] = 0xFFFFFFFF;
}
}
}
}
uploadBufferView.UnmapAndWrite();
var texture2DView = texture2D.CreateView(0, 1);
copyContext.Copy(texture2DView, uploadBufferView);
return(texture2DView);
}
static GraphicsTextureView CreateTexture3DView(GraphicsCopyContext copyContext, GraphicsTexture texture3D, GraphicsBuffer uploadBuffer, bool isQuickAndDirty)
{
var uploadBufferView = uploadBuffer.CreateBufferView <byte>(checked ((uint)texture3D.ByteLength));
var textureDataSpan = uploadBufferView.Map <byte>();
{
var random = new Random(Seed: 20170526);
var isOnBlurring = true;
var width = texture3D.PixelWidth;
var height = texture3D.PixelHeight;
var bytesPerRow = texture3D.BytesPerRow;
var depth = texture3D.PixelDepth;
var bytesPerLayer = texture3D.BytesPerLayer;
// start with random speckles
for (var z = 0u; z < depth; z++)
{
var layerIndex = z * bytesPerLayer;
for (var y = 0u; y < height; y++)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
for (var x = 0u; x < width; x++)
{
// convert indices to fractions in the range [0, 1)
var fx = (float)x / width;
var fz = (float)z / depth;
// make x,z relative to texture center
fx -= 0.5f;
fz -= 0.5f;
// get radius from center, clamped to 0.5
var radius = MathF.Abs(fx); // MathF.Sqrt(fx * fx + fz * fz);
if (radius > 0.5f)
{
radius = 0.5f;
}
// scale as 1 in center, tapering off to the edge
var scale = 2 * MathF.Abs(0.5f - radius);
// random value scaled by the above
var rand = random.NextSingle();
if (isOnBlurring && (rand < 0.99))
{
rand = 0;
}
uint value = (byte)(rand * scale * 255);
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
}
if (isOnBlurring)
{
// now smear them out to smooth smoke splotches
var falloffFactor = isQuickAndDirty ? 0.9f : 0.95f;
for (var z = 0u; z < depth; z++)
{
var layerIndex = z * bytesPerLayer;
for (var y = 0u; y < height; y++)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
for (var x = 1u; x < width; x++)
{
if ((row[x] & 0xFF) < falloffFactor * (row[x - 1] & 0xFF))
{
uint value = (byte)(falloffFactor * (row[x - 1] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
for (var x = width - 2; x != uint.MaxValue; x = unchecked (x - 1))
{
if ((row[x] & 0xFF) < falloffFactor * (row[x + 1] & 0xFF))
{
uint value = (byte)(falloffFactor * (row[x + 1] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
}
}
for (var z = 0u; z < depth; z++)
{
var layerIndex = z * bytesPerLayer;
for (var x = 0u; x < width; x++)
{
for (var y = 1u; y < height; y++)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var previousRowIndex = rowIndex - bytesPerRow;
var previousRow = (uint *)textureDataSpan.GetPointer(previousRowIndex);
if ((row[x] & 0xFF) < falloffFactor * (previousRow[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (previousRow[x] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
for (var y = 0u; y <= 0; y++)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var previousRowOfNextLayerIndex = rowIndex + bytesPerLayer - bytesPerRow;
var previousRowOfNextLayer = (uint *)textureDataSpan.GetPointer(previousRowOfNextLayerIndex);
if ((row[x] & 0xFF) < falloffFactor * (previousRowOfNextLayer[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (previousRowOfNextLayer[x] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
for (var y = 1u; y < height; y++)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var previousRowIndex = rowIndex - bytesPerRow;
var previousRow = (uint *)textureDataSpan.GetPointer(previousRowIndex);
if ((row[x] & 0xFF) < falloffFactor * (previousRow[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (previousRow[x] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
for (var y = height - 2; y != uint.MaxValue; y = unchecked (y - 1))
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var nextRowIndex = rowIndex + bytesPerRow;
var nextRow = (uint *)textureDataSpan.GetPointer(nextRowIndex);
if ((row[x] & 0xFF) < falloffFactor * (nextRow[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (nextRow[x] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
for (var y = height - 1; y >= height - 1; y--)
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var nextRowOfPreviousLayerIndex = rowIndex + bytesPerRow - bytesPerLayer;
var nextRowOfPreviousLayer = (uint *)textureDataSpan.GetPointer(nextRowOfPreviousLayerIndex);
if ((row[x] & 0xFF) < falloffFactor * (nextRowOfPreviousLayer[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (nextRowOfPreviousLayer[x] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
for (var y = height - 2; y != uint.MaxValue; y = unchecked (y - 1))
{
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var nextRowIndex = rowIndex + bytesPerRow;
var nextRow = (uint *)textureDataSpan.GetPointer(nextRowIndex);
if ((row[x] & 0xFF) < falloffFactor * (nextRow[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (nextRow[x] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
}
}
for (var y = 0u; y < height; y++)
{
for (var x = 0u; x < width; x++)
{
if (x != 0)
{
for (var z = 1u; z < depth; z++)
{
var layerIndex = z * bytesPerLayer;
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
var sameRowOfPreviousLayerIndex = rowIndex - bytesPerLayer;
var sameRowOfPreviousLayer = (uint *)textureDataSpan.GetPointer(sameRowOfPreviousLayerIndex);
if ((row[x] & 0xFF) < falloffFactor * (sameRowOfPreviousLayer[x] & 0xFF))
{
uint value = (byte)(falloffFactor * (row[x - 1] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
}
if (x != (width - 1))
{
for (var z = depth - 1u; z != uint.MaxValue; z = unchecked (z - 1))
{
var layerIndex = z * bytesPerLayer;
var rowIndex = layerIndex + (y * bytesPerRow);
var row = (uint *)textureDataSpan.GetPointer(rowIndex);
if ((row[x] & 0xFF) < falloffFactor * (row[x + bytesPerLayer] & 0xFF))
{
uint value = (byte)(falloffFactor * (row[x + 1] & 0xFF));
row[x] = value | (value << 8) | (value << 16) | (value << 24);
}
}
}
}
}
}
}
uploadBufferView.UnmapAndWrite();
var texture3DView = texture3D.CreateView(0, 1);
copyContext.Copy(texture3DView, uploadBufferView);
return(texture3DView);
}