feat: add more image types to load from cooked files

tests/assets_tests.cpp

@@ -432,6 +432,32 @@ namespace {
               "cooked texture pixels must be uploaded as stored");
     }
 
+    void testLdrTextureFile()
+    {
+        const std::vector<std::uint8_t> rgba{255, 0, 0, 255, 0, 128, 255, 64};
+        const auto texture = TextureFile::FromRGBA8(2, 1, rgba);
+        const auto loaded = TextureFile::Read(TextureFile::Write(texture));
+        check(loaded.format == TextureFile::PixelFormat::RGBA8 && loaded.pixels == rgba,
+              "8 bit cooked textures must round-trip");
+
+        const auto dir = std::filesystem::temp_directory_path() / "destrum_ldr_texture_test";
+        std::filesystem::create_directories(dir);
+        const auto source = dir / "missing_source.png";
+        auto cooked = source;
+        cooked += TextureFile::Extension;
+        TextureFile::WriteToFile(texture, cooked);
+
+        const auto color = util::loadImage(source, TextureIntent::ColorSrgb);
+        const auto data = util::loadImage(source, TextureIntent::DataLinear);
+        std::filesystem::remove_all(dir);
+
+        check(color.vkFormat == VK_FORMAT_R8G8B8A8_SRGB && data.vkFormat == VK_FORMAT_R8G8B8A8_UNORM,
+              "8 bit cooked textures must pick their color space from the intent");
+        check(color.width == 2 && color.height == 1 && color.pixels != nullptr &&
+              std::memcmp(color.pixels, rgba.data(), rgba.size()) == 0,
+              "loading a source image must use its cooked sibling");
+    }
+
     void testAssetReferenceCacheKeys()
     {
         const AssetReference reference{
@@ -528,6 +554,7 @@ void RunAssetsTests()
     testAssetManagerLoadsCookedModels();
     testTextureFileRoundTrip();
     testImageLoaderReadsCookedTextures();
+    testLdrTextureFile();
     testAssetReferenceCacheKeys();
     testAssetGuids();
     testAssetDatabaseFollowsMovedAssets();