// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef Vertex_hpp
#define Vertex_hpp

#include "Color.hpp"
#include "Common/Types.hpp"
#include "Main/Config.hpp"

namespace sw
{
	enum Out
	{
		// Default vertex output semantics
		Pos = 0,
		C0 = 1,   // Diffuse
		C1 = 2,   // Specular
		T0 = 3,
		T1 = 4,
		T2 = 5,
		T3 = 6,
		T4 = 7,
		T5 = 8,
		T6 = 9,
		T7 = 10,
		Fog = 11,    // x component
		Pts = Fog,   // y component

		// Variable semantics
		V0 = 0,
		Vn_1 = MAX_VERTEX_OUTPUTS - 1,

		Unused,
		VERTEX_OUTPUT_LAST = Unused,
	};

	struct UVWQ
	{
		float u;
		float v;
		float w;
		float q;

		float &operator[](int i)
		{
			return (&u)[i];
		}
	};

	ALIGN(16, struct Vertex
	{
		union
		{
			struct   // Fixed semantics
			{
				// Position
				float x;
				float y;
				float z;
				float w;

				float4 C[2];   // Diffuse and specular color

				UVWQ T[8];           // Texture coordinates

				float f;             // Fog
				float pSize;         // Point size
			};

			float4 v[MAX_VERTEX_OUTPUTS];   // Generic components using semantic declaration
		};

		// Projected coordinates
		int X;
		int Y;
		float Z;
		float W;

		int clipFlags;
		int padding[3];
	});

	static_assert((sizeof(Vertex) & 0x0000000F) == 0, "Vertex size not a multiple of 16 bytes (alignment requirement)");
}

#endif   // Vertex_hpp