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Barycentrics D3D12 Shader Extension Sample

This sample shows how to use the shader extensions for D3D12 to access the barycentric intrinsic instruction in an HLSL pixel shader.

License

MIT: see LICENSE.txt for details.

System requirements

• A graphics card with D3D12 support.¹
  • For instance, any GCN-based AMD GPU onwards.
• Windows 10 (64-bit recommended).
• Visual Studio 2019 with Visual C++ and the Windows 10 SDK installed. The free community edition is sufficient.
  • Note: neither Visual C++ nor the Windows 10 SDK are installed with Visual Studio 2015 by default.
  • For a fresh installation of Visual Studio 2019, choose 'Custom', not 'Typical', and select the required components.
  • For existing installations, you can re-run the installer or select Visual Studio from Programs and Features and click 'Change'.
  • When selecting components to be installed, the option to install the Windows 10 SDK is tucked away under Windows and Web Development -> Universal Windows App Development Tools.
• A graphics driver with GCN shader extension support.
  • For example, AMD Radeon Software Crimson Edition 16.9.1 (driver version 16.40) or later.

Sample overview

This sample renders a triangle zooming in and out. The triangle uses a checker board texture modulated by the barycentric coordinates as RGB colors.

Points of interest

• This sample uses a driver extension to enable the use of instrinsic instructions.
  • The driver extension is accessed through the AMD GPU Services (AGS) library.
  • For more information on AGS, including samples, visit the AGS SDK repository: https://github.com/GPUOpen-LibrariesAndSDKs/AGS_SDK
• The intrinsic instructions require a 5.1 shader model.
• The Root Signature will need to use an extra resource and sampler. These are not real resources/samplers, they are just used to encode the intrinsic instruction.
• The shader compiler should not use the D3DCOMPILE_SKIP_OPTIMIZATION option, otherwise it will not work.
• Other instrinsics are also available.
• The DEBUG configuration will automatically enable the debug layers to validate the API usage. Check the source code for details, as this requires the graphics tools to be installed.

Attribution

• AMD, the AMD Arrow logo, Radeon, and combinations thereof are either registered trademarks or trademarks of Advanced Micro Devices, Inc. in the United States and/or other countries.
• Microsoft, Direct3D, DirectX, Visual Studio, Visual C++, and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

Notes

<a name="barycentrics12-footnote1">1</a>: While the shader extension sample will run on non-AMD hardware, it will be of limited usefulness, since the purpose of the sample is to demonstrate AMD-specific shader extensions.