// 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_Clipper_hpp
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#define sw_Clipper_hpp
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#include "Plane.hpp"
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#include "Common/Types.hpp"
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namespace sw
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{
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struct Polygon;
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struct DrawCall;
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struct DrawData;
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class Clipper
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{
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public:
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enum ClipFlags
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{
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// Indicates the vertex is outside the respective frustum plane
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CLIP_RIGHT = 1 << 0,
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CLIP_TOP = 1 << 1,
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CLIP_FAR = 1 << 2,
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CLIP_LEFT = 1 << 3,
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CLIP_BOTTOM = 1 << 4,
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CLIP_NEAR = 1 << 5,
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CLIP_FRUSTUM = 0x003F,
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CLIP_FINITE = 1 << 7, // All position coordinates are finite
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// User-defined clipping planes
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CLIP_PLANE0 = 1 << 8,
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CLIP_PLANE1 = 1 << 9,
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CLIP_PLANE2 = 1 << 10,
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CLIP_PLANE3 = 1 << 11,
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CLIP_PLANE4 = 1 << 12,
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CLIP_PLANE5 = 1 << 13,
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CLIP_USER = 0x3F00
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};
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Clipper(bool symmetricNormalizedDepth);
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~Clipper();
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unsigned int computeClipFlags(const float4 &v);
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bool clip(Polygon &polygon, int clipFlagsOr, const DrawCall &draw);
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private:
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void clipNear(Polygon &polygon);
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void clipFar(Polygon &polygon);
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void clipLeft(Polygon &polygon);
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void clipRight(Polygon &polygon);
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void clipTop(Polygon &polygon);
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void clipBottom(Polygon &polygon);
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void clipPlane(Polygon &polygon, const Plane &plane);
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void clipEdge(float4 &Vo, const float4 &Vi, const float4 &Vj, float di, float dj) const;
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float n; // Near clip plane distance
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};
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}
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#endif // sw_Clipper_hpp
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