internal void InitializeFrom(Image image)
{
// TODO: Invalidate original image?
pixelBuffers = image.pixelBuffers;
dataBoxArray = image.dataBoxArray;
mipMapToZIndex = image.mipMapToZIndex;
zBufferCountPerArraySlice = image.zBufferCountPerArraySlice;
mipmapDescriptions = image.mipmapDescriptions;
pixelBufferArray = image.pixelBufferArray;
totalSizeInBytes = image.totalSizeInBytes;
buffer = image.buffer;
bufferIsDisposable = image.bufferIsDisposable;
handle = image.handle;
Description = image.Description;
}
internal unsafe void Initialize(ImageDescription description, IntPtr dataPointer, int offset, GCHandle? handle, bool bufferIsDisposable, PitchFlags pitchFlags = PitchFlags.None, int rowStride = 0)
{
if (!description.Format.IsValid() || description.Format.IsVideo())
throw new InvalidOperationException("Unsupported DXGI Format");
if (rowStride > 0 && description.MipLevels != 1)
throw new InvalidOperationException("Cannot specify custom stride with mipmaps");
this.handle = handle;
switch (description.Dimension)
{
case TextureDimension.Texture1D:
if (description.Width <= 0 || description.Height != 1 || description.Depth != 1 || description.ArraySize == 0)
throw new InvalidOperationException("Invalid Width/Height/Depth/ArraySize for Image 1D");
// Check that miplevels are fine
description.MipLevels = CalculateMipLevels(description.Width, 1, description.MipLevels);
break;
case TextureDimension.Texture2D:
case TextureDimension.TextureCube:
if (description.Width <= 0 || description.Height <= 0 || description.Depth != 1 || description.ArraySize == 0)
throw new InvalidOperationException("Invalid Width/Height/Depth/ArraySize for Image 2D");
if (description.Dimension == TextureDimension.TextureCube)
{
if ((description.ArraySize % 6) != 0)
throw new InvalidOperationException("TextureCube must have an arraysize = 6");
}
// Check that miplevels are fine
description.MipLevels = CalculateMipLevels(description.Width, description.Height, description.MipLevels);
break;
case TextureDimension.Texture3D:
if (description.Width <= 0 || description.Height <= 0 || description.Depth <= 0 || description.ArraySize != 1)
throw new InvalidOperationException("Invalid Width/Height/Depth/ArraySize for Image 3D");
// Check that miplevels are fine
description.MipLevels = CalculateMipLevels(description.Width, description.Height, description.Depth, description.MipLevels);
break;
}
// Calculate mipmaps
int pixelBufferCount;
this.mipMapToZIndex = CalculateImageArray(description, pitchFlags, rowStride, out pixelBufferCount, out totalSizeInBytes);
this.mipmapDescriptions = CalculateMipMapDescription(description, pitchFlags);
zBufferCountPerArraySlice = this.mipMapToZIndex[this.mipMapToZIndex.Count - 1];
// Allocate all pixel buffers
pixelBuffers = new PixelBuffer[pixelBufferCount];
pixelBufferArray = new PixelBufferArray(this);
// Setup all pointers
// only release buffer that is not pinned and is asked to be disposed.
this.bufferIsDisposable = !handle.HasValue && bufferIsDisposable;
this.buffer = dataPointer;
if (dataPointer == IntPtr.Zero)
{
buffer = Utilities.AllocateMemory(totalSizeInBytes);
offset = 0;
this.bufferIsDisposable = true;
}
SetupImageArray((IntPtr)((byte*)buffer + offset), totalSizeInBytes, rowStride, description, pitchFlags, pixelBuffers);
Description = description;
// PreCompute databoxes
dataBoxArray = ComputeDataBox();
}
