| // 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 |