GPU Assisted Validation Shaders

This directory is for holding shaders that are used for shader instrumentation inside GPU Assisted Validation. These are turned in SPIR-V when generating code with generate_spirv.py　and turned into a header file in layers/vulkan/generated.

To regenerate the validation shader, run the following:

# generate all the shaders with glslangValidator at external/glslang/build/install/bin/glslangValidator
python3 ./scripts/generate_spirv.py

# Using own glslangValidator executable
python3 ./scripts/generate_spirv.py --glslang path/to/glslangValidator

# generate a single shader
python3 ./scripts/generate_spirv.py --shader layers/gpu/shaders/gpu_pre_draw.vert

Adding a new shader

1. Add the GLSL shader to this folder with the appropriate naming (consistent with the other files)
2. Include the generated header file
   • example: #include "gpu_pre_draw_vert.h" for gpu_pre_draw.vert
3. Add the new header file to CMake and BUILD.gn (or will fail CI build)

Special note, currently any shader file starting with “inst_” means the shader is “instrumented”. The script will call glslang with the --no-link flag and using spirv-link to append the function.