src/tint/lang/glsl/writer/writer_bench.cc

// Copyright 2022 The Dawn & Tint Authors
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#include <string>

#include "src/tint/cmd/bench/bench.h"
#include "src/tint/lang/glsl/writer/helpers/generate_bindings.h"
#include "src/tint/lang/glsl/writer/writer.h"
#include "src/tint/lang/wgsl/ast/identifier.h"
#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/lang/wgsl/ast/transform/manager.h"
#include "src/tint/lang/wgsl/ast/transform/single_entry_point.h"
#include "src/tint/lang/wgsl/inspector/inspector.h"
#include "src/tint/lang/wgsl/reader/reader.h"

namespace tint::glsl::writer {
namespace {

void GenerateGLSL(benchmark::State& state, std::string input_name) {
    auto res = bench::GetWgslProgram(input_name);
    if (res != Success) {
        state.SkipWithError(res.Failure().reason.Str());
        return;
    }

    // Generate the input program and generator options for each entry point.
    std::vector<Program> programs;
    std::vector<Options> options;
    std::vector<std::string> names;
    tint::inspector::Inspector inspector(res->program);
    for (auto ep : inspector.GetEntryPoints()) {
        tint::glsl::writer::Options gen_options = {};
        gen_options.bindings = tint::glsl::writer::GenerateBindings(res->program);
        gen_options.bindings.texture_builtins_from_uniform.ubo_binding = {4u, 0u};

        auto textureBuiltinsFromUniformData = inspector.GetTextureQueries(ep.name);
        if (!textureBuiltinsFromUniformData.empty()) {
            for (size_t i = 0; i < textureBuiltinsFromUniformData.size(); ++i) {
                const auto& info = textureBuiltinsFromUniformData[i];

                // This is the unmodified binding point from the WGSL shader.
                tint::BindingPoint srcBindingPoint{info.group, info.binding};
                gen_options.bindings.texture_builtins_from_uniform.ubo_bindingpoint_ordering
                    .emplace_back(srcBindingPoint);
            }
        }

        // Run single entry point to strip the program down to a single entry point.
        tint::ast::transform::Manager manager;
        tint::ast::transform::DataMap inputs;
        tint::ast::transform::DataMap outputs;
        inputs.Add<tint::ast::transform::SingleEntryPoint::Config>(ep.name);
        manager.Add<tint::ast::transform::SingleEntryPoint>();
        auto program = manager.Run(res->program, inputs, outputs);

        programs.push_back(std::move(program));
        options.push_back(gen_options);
        names.push_back(ep.name);
    }

    for (auto _ : state) {
        for (uint32_t i = 0; i < programs.size(); i++) {
            // Convert the AST program to an IR module.
            auto ir = tint::wgsl::reader::ProgramToLoweredIR(programs[i]);
            if (ir != Success) {
                state.SkipWithError(ir.Failure().reason.Str());
                return;
            }

            // Generate GLSL.
            auto gen_res = Generate(ir.Get(), options[i], names[i]);
            if (gen_res != Success) {
                state.SkipWithError(gen_res.Failure().reason.Str());
            }
        }
    }
}

TINT_BENCHMARK_PROGRAMS(GenerateGLSL);

}  // namespace
}  // namespace tint::glsl::writer