The FidelityFX SDK Shader Compiler tool is distributed as part of the FidelityFX SDK package and is the command line tool used by the SDK to pre-generate all shader permutation binaries that are loaded at runtime.
The current version of the Shader Compiler and its needed libraries/dlls are kept in the /sdk/tools/binary_store folder.
To use it, simply invoke it from your build process (see the existing backend CMakeList.txt files as an example of launching it as part of the build process).
The following arguments will allow you to control how compilation occurs:
FidelityFX_SC.exe [Options] <InputFile>
Options
| Option | Descriptions |
|---|---|
| <CompilerArgs> | A list of arguments accepted by the target compiler, separated by spaces. |
| -output=<Path> | Path to where the shader permutations should be output to. |
| -D<Name> | Define a macro that is defined in all shader permutations. |
| -D<Name>={<Value1>, <Value2>, <Value3> ...} | Declare a shader option that will generate permutations with the macro defined using the given values. Use a '-' to define a permutation where no macro is defined. |
| -num-threads=<Num> | Number of threads to use for generating shaders. Sets to the max number of threads available on the current CPU by default. |
| -name=<Name> | The name used for prefixing variables in the generated headers. Uses the file name by default. |
| -reflection | Generate header containing reflection data. |
| -embed-arguments | Write the compile arguments used for each permutation into their respective headers. |
| -print-arguments | Print the compile arguments used for each permuations. |
| -disable-logs | Prevent logging of compile warnings and errors. |
| -compiler=<Compiler> | Select the compiler to generate permutations from (dxc, fxc or glslang). |
| -dxcdll=<DXC DLL Path> | Path to the dxccompiler dll to use. |
| -d3ddll=<D3D DLL Path> | Path to the d3dcompiler dll to use. |
| -glslangexe=<glslangValidator.exe Path> | Path to the glslangValidator executable to use. |
| -deps=<Format> | Dump depfile which recorded the include file dependencies in format of (gcc or msvc). |
| -debugcompile | Compile shader with debug information. |
| -debugcmdline | Print all the input arguments. |
Should the need arise to build and/or modify the shader compiler tool, a solution can be generated by navigating to /sdk/tools/ffx_shader_compiler/ sub-folder and launching GenerateSolution.bat. This will in turn create a solution for the shader compiler in an /build subfolder.
When building a new shader compiler, the output will be sent to /sdk/tools/ffx_shader_compiler/bin/ sub-folder in a release or debug folder (based on configuration built). In order to use the newly compiled tool, it needs to have all binary files copied from the binary output location (bin directory) to the binary_store directory.