EDIT: folder structure refactoring (src/core)

src/core/assets/ktx_loader.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <core/types.h>
+#include <vector>
+
+// Simple KTX2 helpers focused on IBL assets.
+// Uses libktx to open and (if needed) transcode to GPU-ready BC formats.
+namespace ktxutil
+{
+    struct KtxCubemap
+    {
+        VkFormat fmt{VK_FORMAT_UNDEFINED};
+        uint32_t baseW{0};
+        uint32_t baseH{0};
+        uint32_t mipLevels{0};
+        uint32_t layers{0}; // total array layers in the Vulkan image (faces × layers)
+        std::vector<uint8_t> bytes; // full file data block returned by libktx
+        std::vector<VkBufferImageCopy> copies; // one per (mip × layer)
+        VkImageCreateFlags imgFlags{0}; // e.g., VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT
+    };
+
+    // Loads a .ktx2 cubemap (or cubemap array) and prepares copy regions for upload.
+    // - Prefers BC6H UFLOAT for HDR content; leaves existing GPU BC formats intact.
+    // - Returns true on success and fills 'out'.
+    bool load_ktx2_cubemap(const char* path, KtxCubemap& out);
+
+    // Optional: minimal 2D loader for BRDF LUTs (RG/BC5 etc.). Returns VkFormat and copies per mip.
+    struct Ktx2D
+    {
+        VkFormat fmt{VK_FORMAT_UNDEFINED};
+        uint32_t baseW{0};
+        uint32_t baseH{0};
+        uint32_t mipLevels{0};
+        std::vector<uint8_t> bytes;
+        std::vector<VkBufferImageCopy> copies;
+    };
+    bool load_ktx2_2d(const char* path, Ktx2D& out);
+}
+