asset compression

implementations/Crafter.Build-Asset.cpp

@@ -0,0 +1,55 @@
+/*
+Crafter® Build
+Copyright (C) 2026 Catcrafts®
+Catcrafts.net
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License version 3.0 as published by the Free Software Foundation;
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+*/
+
+module Crafter.Build:Asset_impl;
+import :Asset;
+import std;
+#ifdef CRAFTER_BUILD_HAS_ASSET
+import Crafter.Asset;
+import Crafter.Math;
+#endif
+namespace fs = std::filesystem;
+
+namespace Crafter {
+    std::string CompressAsset(const fs::path& input, const fs::path& output) {
+        std::string ext = input.extension().string();
+#ifdef CRAFTER_BUILD_HAS_ASSET
+        try {
+            if (ext == ".png") {
+                auto tex = TextureAsset<Vector<std::uint8_t, 4, 4>>::LoadPNG<std::uint8_t>(input);
+                tex.SaveCompressed(output);
+            } else if (ext == ".obj") {
+                auto mesh = MeshAsset<VertexNormalTangentUVPacked>::LoadOBJ(input);
+                mesh.SaveCompressed(output);
+            } else {
+                return std::format("{}: unsupported asset extension '{}'", input.string(), ext);
+            }
+        } catch (const std::exception& e) {
+            return std::format("{}: {}", input.string(), e.what());
+        }
+        return {};
+#else
+        return std::format(
+            "{}: crafter-build was bootstrapped without Crafter.Asset linkage; "
+            "rebuild via `./bin/crafter-build` so the self-host pass picks up the "
+            "Crafter.Asset dep declared in project.cpp",
+            input.string());
+#endif
+    }
+}