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