/// <summary>
/// Loads or compiles the bytecode from an input D2D1 pixel shader.
/// </summary>
/// <typeparam name="T">The type of D2D1 pixel shader to load the bytecode for.</typeparam>
/// <param name="shaderProfile">The shader profile to use to get the shader bytecode.</param>
/// <returns>A <see cref="ReadOnlyMemory{T}"/> instance with the resulting shader bytecode.</returns>
/// <exception cref="InvalidOperationException">Thrown if the input shader has not been precompiled.</exception>
private static ReadOnlyMemory <byte> LoadOrCompilePixelShaderBytecode <T>(D2D1ShaderProfile?shaderProfile)
where T : unmanaged, ID2D1PixelShader
{
D2D1ShaderBytecodeLoader bytecodeLoader = default;
Unsafe.SkipInit(out T shader);
shader.LoadBytecode(ref bytecodeLoader, shaderProfile);
using ComPtr <ID3DBlob> dynamicBytecode = bytecodeLoader.GetResultingShaderBytecode(out ReadOnlySpan <byte> precompiledBytecode);
// If a precompiled shader is available, return it
if (!precompiledBytecode.IsEmpty)
{
return(new PinnedBufferMemoryManager(precompiledBytecode).Memory);
}
// Otherwise, return the dynamic shader instead
byte *bytecodePtr = (byte *)dynamicBytecode.Get()->GetBufferPointer();
int bytecodeSize = (int)dynamicBytecode.Get()->GetBufferSize();
return(new ReadOnlySpan <byte>(bytecodePtr, bytecodeSize).ToArray());
}
/// <summary>
/// Gets the shader info associated with a given D2D1 shader.
/// </summary>
/// <typeparam name="T">The type of D2D1 shader to retrieve info for.</typeparam>
/// <returns>The resulting <see cref="D2D1ShaderInfo"/> instance.</returns>
public static unsafe D2D1ShaderInfo GetShaderInfo <T>()
where T : struct, ID2D1PixelShader
{
Unsafe.SkipInit(out T shader);
shader.BuildHlslSource(out string hlslSource);
D2D1ShaderBytecodeLoader bytecodeLoader = default;
shader.LoadBytecode(ref bytecodeLoader, D2D1ShaderProfile.PixelShader50);
using ComPtr <ID3DBlob> dynamicBytecode = bytecodeLoader.GetResultingShaderBytecode(out ReadOnlySpan <byte> precompiledBytecode);
byte *bytecodePtr;
int bytecodeSize;
if (!precompiledBytecode.IsEmpty)
{
bytecodePtr = (byte *)Unsafe.AsPointer(ref MemoryMarshal.GetReference(precompiledBytecode));
bytecodeSize = precompiledBytecode.Length;
}
else
{
bytecodePtr = (byte *)dynamicBytecode.Get()->GetBufferPointer();
bytecodeSize = (int)dynamicBytecode.Get()->GetBufferSize();
}
using ComPtr <ID3D11ShaderReflection> d3D11ShaderReflection = default;
DirectX.D3DReflect(
pSrcData: bytecodePtr,
SrcDataSize: (nuint)bytecodeSize,
pInterface: Windows.__uuidof <ID3D11ShaderReflection>(),
ppReflector: d3D11ShaderReflection.GetVoidAddressOf()).Assert();
D3D11_SHADER_DESC d3D11ShaderDescription;
d3D11ShaderReflection.Get()->GetDesc(&d3D11ShaderDescription).Assert();
return(new(
CompilerVersion : new string(d3D11ShaderDescription.Creator),
HlslSource : hlslSource,
ConstantBufferCount : d3D11ShaderDescription.ConstantBuffers,
BoundResourceCount : d3D11ShaderDescription.BoundResources,
InstructionCount : d3D11ShaderDescription.InstructionCount,
TemporaryRegisterCount : d3D11ShaderDescription.TempRegisterCount,
TemporaryArrayCount : d3D11ShaderDescription.TempArrayCount,
ConstantDefineCount : d3D11ShaderDescription.DefCount,
DeclarationCount : d3D11ShaderDescription.DclCount,
TextureNormalInstructions : d3D11ShaderDescription.TextureNormalInstructions,
TextureLoadInstructionCount : d3D11ShaderDescription.TextureLoadInstructions,
TextureStoreInstructionCount : d3D11ShaderDescription.cTextureStoreInstructions,
FloatInstructionCount : d3D11ShaderDescription.FloatInstructionCount,
IntInstructionCount : d3D11ShaderDescription.IntInstructionCount,
UIntInstructionCount : d3D11ShaderDescription.UintInstructionCount,
StaticFlowControlInstructionCount : d3D11ShaderDescription.StaticFlowControlCount,
DynamicFlowControlInstructionCount : d3D11ShaderDescription.DynamicFlowControlCount,
EmitInstructionCount : d3D11ShaderDescription.EmitInstructionCount,
BarrierInstructionCount : d3D11ShaderDescription.cBarrierInstructions,
InterlockedInstructionCount : d3D11ShaderDescription.cInterlockedInstructions,
BitwiseInstructionCount : d3D11ShaderReflection.Get()->GetBitwiseInstructionCount(),
MovcInstructionCount : d3D11ShaderReflection.Get()->GetMovcInstructionCount(),
MovInstructionCount : d3D11ShaderReflection.Get()->GetMovInstructionCount(),
InterfaceSlotCount : d3D11ShaderReflection.Get()->GetNumInterfaceSlots(),
RequiresDoublePrecisionSupport : (d3D11ShaderReflection.Get()->GetRequiresFlags() & (D3D.D3D_SHADER_REQUIRES_DOUBLES | D3D.D3D_SHADER_REQUIRES_11_1_DOUBLE_EXTENSIONS)) != 0));
}
