1 files changed, 81 insertions, 0 deletions
diff --git a/src/core/resource/image.cc b/src/core/resource/image.cc
new file mode 100644
index 0000000..8ab98db
--- /dev/null
+++ b/src/core/resource/image.cc
@@ -0,0 +1,81 @@
+#include "core/pch.hh"
+
+#include "core/resource/image.hh"
+
+#include "core/resource/resource.hh"
+
+#include "core/io/physfs.hh"
+
+static int stbi_physfs_read(void* context, char* data, int size)
+{
+    return static_cast<int>(PHYSFS_readBytes(reinterpret_cast<PHYSFS_File*>(context), data, size));
+}
+
+static void stbi_physfs_skip(void* context, int count)
+{
+    auto file = reinterpret_cast<PHYSFS_File*>(context);
+    PHYSFS_seek(file, PHYSFS_tell(file) + count);
+}
+
+static int stbi_physfs_eof(void* context)
+{
+    return PHYSFS_eof(reinterpret_cast<PHYSFS_File*>(context));
+}
+
+static const void* image_load_func(const char* name, std::uint32_t flags)
+{
+    assert(name);
+
+    stbi_io_callbacks callbacks;
+    callbacks.read = &stbi_physfs_read;
+    callbacks.skip = &stbi_physfs_skip;
+    callbacks.eof = &stbi_physfs_eof;
+
+    stbi_set_flip_vertically_on_load(bool(flags & IMAGE_LOAD_FLIP));
+
+    auto file = PHYSFS_openRead(name);
+
+    if(file == nullptr) {
+        spdlog::error("image: {}: {}", name, io::physfs_error());
+        return nullptr;
+    }
+
+    int desired_channels;
+
+    if(flags & IMAGE_LOAD_GRAY) {
+        desired_channels = STBI_grey;
+    }
+    else {
+        desired_channels = STBI_rgb_alpha;
+    }
+
+    int width, height, channels;
+    auto pixels = stbi_load_from_callbacks(&callbacks, file, &width, &height, &channels, desired_channels);
+
+    PHYSFS_close(file);
+
+    if(pixels == nullptr) {
+        spdlog::error("image: {}: {}", name, stbi_failure_reason());
+        return nullptr;
+    }
+
+    auto image = new Image;
+    image->pixels = pixels;
+    image->size = glm::ivec2(width, height);
+    return image;
+}
+
+static void image_free_func(const void* resource)
+{
+    assert(resource);
+
+    auto image = reinterpret_cast<const Image*>(resource);
+    stbi_image_free(image->pixels);
+
+    delete image;
+}
+
+void Image::register_resource(void)
+{
+    resource::register_loader<Image>(&image_load_func, &image_free_func);
+}