src/Renderer/Polygon.hpp

   1 // Copyright 2016 The SwiftShader Authors. All Rights Reserved.
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //    http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 #ifndef sw_Polygon_hpp
  16 #define sw_Polygon_hpp
  17
  18 #include "Vertex.hpp"
  19
  20 namespace sw
  21 {
  22         struct Polygon
  23         {
  24                 Polygon(const float4 *P0, const float4 *P1, const float4 *P2)
  25                 {
  26                         P[0][0] = P0;
  27                         P[0][1] = P1;
  28                         P[0][2] = P2;
  29
  30                         n = 3;
  31                         i = 0;
  32                         b = 0;
  33                 }
  34
  35                 Polygon(const float4 *P, int n)
  36                 {
  37                         for(int i = 0; i < n; i++)
  38                         {
  39                                 this->P[0][i] = &P[i];
  40                         }
  41
  42                         this->n = n;
  43                         this->i = 0;
  44                         this->b = 0;
  45                 }
  46
  47                 float4 B[16];              // Buffer for clipped vertices
  48                 const float4 *P[16][16];   // Pointers to clipped polygon's vertices
  49
  50                 int n;   // Number of vertices
  51                 int i;   // Level of P to use
  52                 int b;   // Next available new vertex
  53         };
  54 }
  55
  56 #endif   // sw_Polygon_hpp