feat: initial DX12 foundation framework

Engine/Common/XEnginType.h

@@ -0,0 +1,23 @@
+#pragma once
+#include <stdint.h>
+
+using u8  = uint8_t;
+using u16 = uint16_t;
+using u32 = uint32_t;
+using u64 = uint64_t;
+
+
+using s8  = int8_t;
+using s16 = int16_t;
+using s32 = int32_t;
+using s64 = int64_t;
+
+
+
+constexpr u64 u64_invalid_id{ 0xffffffffffffffff };
+constexpr u32 u32_invalid_id{ 0xffffffff };
+constexpr u16 u16_invalid_id{ 0xffff };
+constexpr u8  u8_invalid_id { 0xff };
+
+
+using f32 = float;