/// <summary>
/// Compiles a D2D1 pixel shader with <c>D2D_FULL_SHADER</c>.
/// </summary>
/// <param name="source">The HLSL source code to compile.</param>
/// <param name="shaderProfile">The shader profile to use to compile the shader.</param>
/// <returns>The bytecode for the compiled shader.</returns>
private static ComPtr <ID3DBlob> CompileD2DFullShader(ReadOnlySpan <char> source, D2D1ShaderProfile shaderProfile)
{
// Encode the HLSL source to ASCII
int maxLength = Encoding.ASCII.GetMaxByteCount(source.Length);
byte[] buffer = ArrayPool <byte> .Shared.Rent(maxLength);
int writtenBytes = Encoding.ASCII.GetBytes(source, buffer);
using ComPtr <ID3DBlob> d3DBlobBytecode = default;
using ComPtr <ID3DBlob> d3DBlobErrors = default;
int hResult;
fixed(byte *bufferPtr = buffer)
{
// Prepare the macros for full shader compilation:
//
// -D D2D_FULL_SHADER
// -D D2D_ENTRY=Execute
D3D_SHADER_MACRO *macros = stackalloc D3D_SHADER_MACRO[]
{
new()
{
Name = (sbyte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(ASCII.D2D_FULL_SHADER)),
Definition = (sbyte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(ASCII.NullTerminator))
},
new()
{
Name = (sbyte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(ASCII.D2D_ENTRY)),
Definition = (sbyte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(ASCII.Execute))
},
new()
};
// Compile the shader with -ps_5_0 -O3 -We -Zpr
hResult = DirectX.D3DCompile(
pSrcData: bufferPtr,
SrcDataSize: (nuint)writtenBytes,
pSourceName: null,
pDefines: macros,
pInclude: D3DIncludeForD2D1EffectHelpers,
pEntrypoint: (sbyte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(ASCII.Execute)),
pTarget: (sbyte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(ASCII.GetPixelShaderProfile(shaderProfile))),
Flags1: D3DCOMPILE.D3DCOMPILE_OPTIMIZATION_LEVEL3 | D3DCOMPILE.D3DCOMPILE_WARNINGS_ARE_ERRORS | D3DCOMPILE.D3DCOMPILE_PACK_MATRIX_ROW_MAJOR,
Flags2: 0,
ppCode: d3DBlobBytecode.GetAddressOf(),
ppErrorMsgs: d3DBlobErrors.GetAddressOf());
}
ArrayPool <byte> .Shared.Return(buffer);
// Throw if an error was retrieved, then also double check the HRESULT
if (d3DBlobErrors.Get() is not null)
{
ThrowHslsCompilationException(d3DBlobErrors.Get());
}
hResult.Assert();
return(d3DBlobBytecode.Move());
}
