support C++20

inc/hgl/graph/Bitmap2DLoader.h

@@ -7,7 +7,7 @@ namespace hgl
     namespace graph
     {
         /**
-        * 2Dλͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+        * 2D位图加载类
         */
         class Bitmap2DLoader:public Texture2DLoader
         {
@@ -20,7 +20,7 @@ namespace hgl
             Bitmap2DLoader():Texture2DLoader(){}
             ~Bitmap2DLoader();
 
-            void *OnBegin(uint32 total_bytes) override;
+            void *OnBegin(uint32 total_bytes,const VkFormat &) override;
             bool OnEnd() override {return(false);}
 
             BitmapData *GetBitmap();

inc/hgl/graph/TextureLoader.h

@@ -85,10 +85,16 @@ namespace hgl
 
         protected:
 
-            virtual void *OnBegin(uint32)=0;
+            virtual void *OnBegin(uint32,const VkFormat &)=0;
             virtual bool  OnEnd()=0;
             virtual void  OnError(){}
 
+        public:
+
+            const TextureFileHeader &   GetFileHeader   ()const{return file_header;}
+            const VkFormat &            GetTextureFormat()const{return format;}
+            const uint32                GetZeroMipmapBytes()const{return mipmap_zero_total_bytes;}
+
         public:
 
             TextureLoader()