// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef sw_Primitive_hpp
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#define sw_Primitive_hpp
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#include "Vertex.hpp"
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#include "Main/Config.hpp"
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namespace sw
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{
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struct Triangle
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{
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Vertex v0;
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Vertex v1;
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Vertex v2;
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};
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struct PlaneEquation // z = A * x + B * y + C
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{
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float4 A;
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float4 B;
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float4 C;
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};
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struct Primitive
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{
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int yMin;
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int yMax;
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float4 xQuad;
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float4 yQuad;
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PlaneEquation z;
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PlaneEquation w;
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union
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{
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struct
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{
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PlaneEquation C[2][4];
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PlaneEquation T[8][4];
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PlaneEquation f;
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};
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PlaneEquation V[MAX_FRAGMENT_INPUTS][4];
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};
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float area;
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// Masks for two-sided stencil
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int64_t clockwiseMask;
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int64_t invClockwiseMask;
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struct Span
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{
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unsigned short left;
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unsigned short right;
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};
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// The rasterizer adds a zero length span to the top and bottom of the polygon to allow
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// for 2x2 pixel processing. We need an even number of spans to keep accesses aligned.
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Span outlineUnderflow[2];
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Span outline[OUTLINE_RESOLUTION];
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Span outlineOverflow[2];
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};
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}
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#endif // sw_Primitive_hpp
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