rework the lut system

include/renderer_mtl/mtl_lut_texture.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <Metal/Metal.hpp>
+
+namespace Metal {
+
+class LutTexture {
+public:
+    LutTexture(MTL::Device* device, MTL::TextureType type, MTL::PixelFormat pixelFormat, u32 width, u32 height, const char* name);
+    ~LutTexture();
+
+    u32 getNextIndex();
+
+    // Getters
+    MTL::Texture* getTexture() { return texture; }
+
+    u32 getCurrentIndex() { return currentIndex; }
+
+private:
+    MTL::Texture* texture;
+
+    u32 currentIndex = 0;
+};
+
+} // namespace Metal