Jorijn van der Graaf
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Canonical LGPL-3.0-only text, GPL-3.0 companion, SPDX headers on all first-party sources, MIT for examples/. Vendored lib/ untouched. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
104 lines
4.4 KiB
C++
104 lines
4.4 KiB
C++
//SPDX-License-Identifier: LGPL-3.0-only
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//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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module Crafter.Build:Asset_impl;
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import :Asset;
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import std;
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#ifdef CRAFTER_BUILD_HAS_ASSET
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import Crafter.Asset;
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import Crafter.Math;
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#endif
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namespace fs = std::filesystem;
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namespace Crafter {
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std::string CompressAsset(const fs::path& input, const fs::path& output) {
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std::string ext = input.extension().string();
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// Case-insensitive extension match — Sponza's textures dir mixes
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// case (.tga and .TGA both appear in the wild).
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for (char& c : ext) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
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#ifdef CRAFTER_BUILD_HAS_ASSET
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try {
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// stb_image (the loader behind LoadPNG) handles all of these,
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// so a single branch covers every raster format we ship. The
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// function is misnamed for historical reasons.
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if (ext == ".png" || ext == ".tga" || ext == ".jpg" || ext == ".jpeg" || ext == ".bmp") {
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auto tex = TextureAsset<Vector<std::uint8_t, 4, 4>>::LoadPNG<std::uint8_t>(input);
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tex.SaveCompressed(output);
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} else if (ext == ".obj") {
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auto mesh = MeshAsset<VertexNormalTangentUVPacked>::LoadOBJ(input);
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mesh.SaveCompressed(output);
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} else {
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return std::format("{}: unsupported asset extension '{}'", input.string(), ext);
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}
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} catch (const std::exception& e) {
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return std::format("{}: {}", input.string(), e.what());
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}
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return {};
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#else
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return std::format(
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"{}: crafter-build was bootstrapped without Crafter.Asset linkage; "
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"rebuild via `./bin/crafter-build` so the self-host pass picks up the "
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"Crafter.Asset dep declared in project.cpp",
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input.string());
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#endif
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}
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std::string BuildOBJBundle(
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const fs::path& objPath,
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const fs::path& mtlPath,
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const fs::path& outDir,
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std::uint16_t albedoSize)
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{
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#ifdef CRAFTER_BUILD_HAS_ASSET
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const fs::path manifest = outDir / "scene.txt";
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if (fs::exists(manifest)) return {};
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try {
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fs::create_directories(outDir);
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auto materials = LoadMTL(mtlPath);
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auto meshes = MeshAsset<VertexNormalTangentUVPacked>::LoadOBJSplit(objPath);
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std::vector<std::string> uniqueAlbedos;
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std::unordered_map<std::string, std::uint32_t> albedoIndex;
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for (auto& [matName, _] : meshes) {
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auto matIt = materials.find(matName);
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if (matIt == materials.end() || matIt->second.mapKd.empty()) continue;
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const std::string& kd = matIt->second.mapKd;
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if (!albedoIndex.contains(kd)) {
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albedoIndex.emplace(kd, static_cast<std::uint32_t>(uniqueAlbedos.size()));
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uniqueAlbedos.push_back(kd);
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}
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}
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std::vector<std::int32_t> meshAlbedoIdx;
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std::uint32_t emitted = 0;
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for (auto& [matName, mesh] : meshes) {
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if (mesh.vertexes.empty() || mesh.indexes.empty()) continue;
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mesh.SaveCompressed(outDir / std::format("mesh_{}.cmesh", emitted));
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std::int32_t a = -1;
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if (auto it = materials.find(matName);
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it != materials.end() && !it->second.mapKd.empty())
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a = static_cast<std::int32_t>(albedoIndex.at(it->second.mapKd));
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meshAlbedoIdx.push_back(a);
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++emitted;
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}
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for (std::uint32_t i = 0; i < uniqueAlbedos.size(); ++i) {
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const fs::path texPath = mtlPath.parent_path() / uniqueAlbedos[i];
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auto tex = TextureAsset<Vector<std::uint8_t, 4, 4>>::LoadPNG<std::uint8_t>(texPath);
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tex.Resize(albedoSize, albedoSize);
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tex.SaveCompressed(outDir / std::format("tex_{}.ctex", i));
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}
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std::ofstream m(manifest);
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m << uniqueAlbedos.size() << "\n" << emitted << "\n";
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for (std::int32_t a : meshAlbedoIdx) m << a << "\n";
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} catch (const std::exception& e) {
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return std::format("BuildOBJBundle: {}", e.what());
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}
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return {};
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#else
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return "BuildOBJBundle: crafter-build was bootstrapped without Crafter.Asset linkage; "
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"rebuild via crafter-build itself to pick up the Crafter.Asset dep";
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#endif
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}
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}
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