Crafter.Graphics/examples/CustomShader/project.cpp

//SPDX-License-Identifier: MIT
//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®

import std;
import Crafter.Build;
namespace fs = std::filesystem;
using namespace Crafter;

extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
    bool isWasm = false;
    for (std::string_view a : args) {
        if (a.starts_with("--target=") && a.find("wasm") != std::string_view::npos) {
            isWasm = true;
            break;
        }
    }

    Configuration* graphics = LocalProject({
        .projectFile = "../../project.cpp",
        .args = std::vector<std::string>(args.begin(), args.end()),
    });

    Configuration cfg;
    cfg.path = "./";
    cfg.name = "CustomShader";
    cfg.outputName = "CustomShader";
    cfg.type = ConfigurationType::Executable;
    if (isWasm) {
        cfg.target = "wasm32-wasip1";
        cfg.defines.push_back({"CRAFTER_GRAPHICS_WINDOW_DOM", ""});
        // Match the -msimd128 that Crafter.Math/Crafter.Graphics's wasm
        // PCMs were compiled with.
        cfg.compileFlags.push_back("-msimd128");
    }
    ApplyStandardArgs(cfg, args);
    cfg.dependencies = { graphics };

    std::array<fs::path, 0> ifaces = {};
    std::array<fs::path, 1> impls = { "main" };
    cfg.GetInterfacesAndImplementations(ifaces, impls);

    if (isWasm) {
        // WGSL source is shipped as a static file and loaded via the
        // WASI VFS at runtime through WebGPUComputeShader::Load(path).
        cfg.files.emplace_back(fs::path("inverse-circle.comp.wgsl"));
        EnableWasiBrowserRuntime(cfg);
    } else {
        cfg.shaders.emplace_back(fs::path("inverse-circle.comp.glsl"),
                                 std::string("main"), ShaderType::Compute);
        // Second build of the same source for drivers without
        // VK_EXT_descriptor_heap: inverse-circle.comp.sets.spv. ComputeShader::Load
        // picks it at runtime, so a custom shader needs both to run everywhere.
        Shader& sets = cfg.shaders.emplace_back(fs::path("inverse-circle.comp.glsl"),
                                                std::string("main"), ShaderType::Compute);
        sets.defines = {"CRAFTER_GRAPHICS_DESCRIPTOR_SETS"};
        sets.variant = "sets";
    }
    return cfg;
}