Fixed blit key encoding.

src/bgfx_p.h

@@ -1232,27 +1232,33 @@ namespace bgfx
 	};
 #undef SORT_KEY_RENDER_DRAW
 
+	constexpr uint8_t  kBlitKeyViewShift = 32-kSortKeyViewNumBits;
+	constexpr uint32_t kBlitKeyViewMask  = uint32_t(BGFX_CONFIG_MAX_VIEWS-1)<<kBlitKeyViewShift;
+	constexpr uint8_t  kBlitKeyItemShift = 0;
+	constexpr uint32_t kBlitKeyItemMask  = UINT16_MAX;
+
 	struct BlitKey
 	{
 		uint32_t encode()
 		{
-			return 0
-				| (uint32_t(m_view) << 24)
-				|  uint32_t(m_item)
-				;
+			const uint32_t view = (uint32_t(m_view) << kBlitKeyViewShift) & kBlitKeyViewMask;
+			const uint32_t item = (uint32_t(m_item) << kBlitKeyItemShift) & kBlitKeyItemMask;
+			const uint64_t key  = view|item;
+
+			return key;
 		}
 
 		void decode(uint32_t _key)
 		{
-			m_item = uint16_t(_key & UINT16_MAX);
-			m_view =   ViewId(_key >> 24);
+			m_item = uint16_t( (_key & kBlitKeyItemMask) >> kBlitKeyItemShift);
+			m_view =   ViewId( (_key & kBlitKeyViewMask) >> kBlitKeyViewShift);
 		}
 
 		static uint32_t remapView(uint32_t _key, ViewId _viewRemap[BGFX_CONFIG_MAX_VIEWS])
 		{
-			const ViewId   oldView = ViewId(_key >> 24);
-			const uint32_t view    = uint32_t(_viewRemap[oldView]) << 24;
-			const uint32_t key     = (_key & ~UINT32_C(0xff000000) ) | view;
+			const ViewId   oldView = ViewId( (_key & kBlitKeyViewMask) >> kBlitKeyViewShift);
+			const uint32_t view    = uint32_t( (_viewRemap[oldView] << kBlitKeyViewShift) & kBlitKeyViewMask);
+			const uint32_t key     = (_key & ~kBlitKeyViewMask) | view;
 			return key;
 		}