Polygon.hpp

// 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 sw_Polygon_hpp
#define sw_Polygon_hpp

#include "Vertex.hpp"

namespace sw
{
	struct Polygon
	{
		Polygon(const float4 *P0, const float4 *P1, const float4 *P2)
		{
			P[0][0] = P0;
			P[0][1] = P1;
			P[0][2] = P2;

			n = 3;
			i = 0;
			b = 0;
		}

		Polygon(const float4 *P, int n)
		{
			for(int i = 0; i < n; i++)
			{
				this->P[0][i] = &P[i];
			}

			this->n = n;
			this->i = 0;
			this->b = 0;
		}

		float4 B[16];              // Buffer for clipped vertices
		const float4 *P[16][16];   // Pointers to clipped polygon's vertices

		int n;   // Number of vertices
		int i;   // Level of P to use
		int b;   // Next available new vertex
	};
}

#endif   // sw_Polygon_hpp