public static FormatTexture CreateTgaTexture(
ReadOnlyMemory <byte> tgaData,
LoaderFlags loaderFlags = LoaderFlags.None
)
{
if (tgaData.Length < sizeof(TGAHeader))
{
ThrowHelper.ThrowInvalidDataException("Too small");
}
ReadOnlySpan <byte> span = tgaData.Span;
TGAHeader header = MemoryMarshal.Read <TGAHeader>(span);
if (IsCompressed(header.DataTypeCode))
{
ThrowHelper.ThrowNotSupportedException("Compressed TGA textures are TODO"); // TODO
}
int size = header.Height * header.Width * (header.BitsPerPixel / 8);
var data = new byte[size];
var buff = data;
DXGI_FORMAT format = loaderFlags.HasFlag(LoaderFlags.ForceSrgb)
? DXGI_FORMAT_R8G8B8A8_UNORM_SRGB
: DXGI_FORMAT_R8G8B8A8_UNORM;
switch (header.BitsPerPixel)
{
case 24:
RbgToRgba(span.Slice(sizeof(TGAHeader)), buff);
break;
case 32:
ArbgToRgba(span.Slice(sizeof(TGAHeader)), buff);
break;
case 16:
Rgba16ToRgba(span.Slice(sizeof(TGAHeader)), buff);
break;
default:
ThrowHelper.ThrowNotSupportedException("Unsupported format");
break;
}
var subresources = new SubresourceData[1];
subresources[0] = new SubresourceData();
var desc = new TextureDesc
{
Width = (uint)header.Width,
Height = (uint)header.Height,
DepthOrArraySize = 0, // is this right?
Format = (DataFormat)format,
Dimension = TextureDimension.Tex2D
};
return(new FormatTexture(
data,
desc,
1,
loaderFlags,
false,
subresources,
header.BitsPerPixel == 24 ? AlphaMode.Opaque : AlphaMode.Unknown,
TexType.Tga
));
}
public static TextureDescription CreateTgaTexture(Memory <byte> tgaData,
LoaderFlags loaderFlags = LoaderFlags.None)
{
if (tgaData.Length < sizeof(TGAHeader))
{
ThrowHelper.ThrowInvalidDataException("Too small");
}
Span <byte> span = tgaData.Span;
TGAHeader header = MemoryMarshal.Read <TGAHeader>(span);
if (IsCompressed(header.DataTypeCode))
{
ThrowHelper.ThrowNotSupportedException("Compressed TGA textures are TODO"); // TODO
}
int size = header.Height * header.Width * (header.BitsPerPixel / 8);
var data = new byte[size];
var buff = data;
DXGI_FORMAT format = loaderFlags.HasFlag(LoaderFlags.ForceSrgb)
? DXGI_FORMAT_R8G8B8A8_UNORM_SRGB
: DXGI_FORMAT_R8G8B8A8_UNORM;
switch (header.BitsPerPixel)
{
case 24:
RbgToRgba(span.Slice(sizeof(TGAHeader)), buff);
break;
case 32:
ArbgToRgba(span.Slice(sizeof(TGAHeader)), buff);
break;
case 16:
Rgba16ToRgba(span.Slice(sizeof(TGAHeader)), buff);
break;
default:
ThrowHelper.ThrowNotSupportedException("Unsupported format");
break;
}
var subresources = new ManagedSubresourceData[1];
subresources[0] = new ManagedSubresourceData();
return(new TextureDescription(
data,
D3D12_RESOURCE_DIMENSION.D3D12_RESOURCE_DIMENSION_TEXTURE2D,
new Size3((uint)header.Height, (uint)header.Width, 0),
1,
1,
format,
loaderFlags,
false,
subresources,
header.BitsPerPixel == 24 ? AlphaMode.Opaque : AlphaMode.Unknown,
TexType.Tga
));
}