Refactor asset loading

src/asset/assettype.h

@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "type/assetpaletteimage.h"
+#include "type/assetalphaimage.h"
+
+typedef enum {
+  ASSET_TYPE_NULL,
+  ASSET_TYPE_PALETTE_IMAGE,
+  ASSET_TYPE_ALPHA_IMAGE,
+  ASSET_TYPE_COUNT,
+} assettype_t;
+
+typedef struct {
+  const char_t *header;
+  const size_t dataSize;
+  errorret_t (*load)(void *data, void *output);
+} assettypedef_t;
+
+static const assettypedef_t ASSET_TYPE_DEFINITIONS[ASSET_TYPE_COUNT] = {
+  [ASSET_TYPE_NULL] = {
+    0
+  },
+
+  [ASSET_TYPE_PALETTE_IMAGE] = {
+    .header = "DPI",
+    .dataSize = sizeof(assetpaletteimage_t),
+    .load = assetPaletteImageLoad
+  },
+
+  [ASSET_TYPE_ALPHA_IMAGE] = {
+    .header = "DAI",
+    .dataSize = sizeof(assetalphaimage_t),
+    .load = assetAlphaImageLoad
+  },
+};