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add notes about DebugPrint IR op

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Frodo Baggins 2024-10-05 12:39:59 -07:00
parent 9fd59e256a
commit fed556ad68
1 changed files with 10 additions and 0 deletions
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10
src/shader_recompiler/ir/ir_emitter.cpp
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@ -1558,6 +1558,16 @@ void IREmitter::ImageWrite(const Value& handle, const Value& coords, const Value
Inst(Opcode::ImageWrite, Flags{info}, handle, coords, color);
}
// Debug print maps to SPIRV's NonSemantic DebugPrintf instruction
// Renderdoc will hook in its own implementation of the SPIRV instruction
// Renderdoc accepts format specifiers, e.g. %u, listed here:
// https://github.com/KhronosGroup/Vulkan-ValidationLayers/blob/main/docs/debug_printf.md
//
// Example usage:
// ir.DebugPrint("invocation xyz: (%u, %u, %u)",
// {ir.GetVectorReg(IR::VectorReg::V0),
// ir.GetVectorReg(IR::VectorReg::V1),
// ir.GetVectorReg(IR::VectorReg::V2)});
void IREmitter::DebugPrint(std::string_view format,
boost::container::small_vector<Value, 5> format_args) {
constexpr size_t PRINT_MAX_ARGS = NumArgsOf(IR::Opcode::DebugPrint);