[Feat] (MG_State/GLState): Implement BufferObject.

MobileGL/MG_State/GLState/BufferState/BufferObject.h

@@ -0,0 +1,88 @@
+#pragma once
+
+namespace MobileGL {
+	enum class BufferTarget {
+		Vertex,
+		Index,
+		Uniform,
+		Array,
+		ElementArray,
+		CopyRead,
+		CopyWrite,
+		PixelPack,
+		PixelUnpack,
+		Query,
+		Texture,
+		TransformFeedback,
+		AtomicCounter,
+		DispatchIndirect,
+		DrawIndirect,
+		ShaderStorage
+	};
+
+	enum class BufferUsage {
+		StreamDraw,
+		StreamRead,
+		StreamCopy,
+		StaticDraw,
+		StaticRead,
+		StaticCopy,
+		DynamicDraw,
+		DynamicRead,
+		DynamicCopy
+	};
+
+	enum class BufferMappingAccessBit : Uint {
+		Read = 0x01,
+		Write = 0x02,
+		InvalidateRange = 0x04,
+		InvalidateBuffer = 0x08,
+		FlushExplicit = 0x10,
+		Unsynchronized = 0x20
+	};
+
+	inline BufferMappingAccessBit operator|(BufferMappingAccessBit a, BufferMappingAccessBit b) {
+		using T = std::underlying_type_t<BufferMappingAccessBit>;
+		return static_cast<BufferMappingAccessBit>(static_cast<T>(a) | static_cast<T>(b));
+	}
+
+	inline BufferMappingAccessBit& operator|=(BufferMappingAccessBit& a, BufferMappingAccessBit b) {
+		a = a | b;
+		return a;
+	}
+
+	inline BufferMappingAccessBit operator&(BufferMappingAccessBit a, BufferMappingAccessBit b) {
+		using T = std::underlying_type_t<BufferMappingAccessBit>;
+		return static_cast<BufferMappingAccessBit>(static_cast<T>(a) & static_cast<T>(b));
+	}
+
+	inline bool any(BufferMappingAccessBit a) {
+		using T = std::underlying_type_t<BufferMappingAccessBit>;
+		return static_cast<T>(a) != 0;
+	}
+
+	namespace MG_State {
+		namespace GLState {
+			class BufferObject {
+			public:
+				void UploadData(DataPtr data);
+				void SetUsage(BufferUsage usage);
+				SizeT GetSize() const;
+				BufferUsage GetUsage() const;
+				Range1D GetDirtyRange() const;
+				SharedPtr<Data> AquireMemory(Bool markMapped);
+				SharedPtr<Data> AquireMemoryRange(Range1D range, BufferMappingAccessBit access);
+				Bool IsMapped() const;
+
+			private:
+				Int m_id = 0;
+				SizeT m_size = 0;
+				BufferUsage m_usage = BufferUsage::StaticDraw;
+				Data m_data;
+				Bool m_isMapped;
+				BufferMappingAccessBit m_mappingAccess;
+				UniquePtr<Range1D> m_dirtyRange;
+			};
+		}
+	}
+}