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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_Primitive_hpp
16 #define sw_Primitive_hpp
17 
18 #include "Vertex.hpp"
19 #include "Config.hpp"
20 
21 namespace sw
22 {
23 	struct Triangle
24 	{
25 		Vertex v0;
26 		Vertex v1;
27 		Vertex v2;
28 	};
29 
30 	struct PlaneEquation   // z = A * x + B * y + C
31 	{
32 		float4 A;
33 		float4 B;
34 		float4 C;
35 	};
36 
37 	struct Primitive
38 	{
39 		int yMin;
40 		int yMax;
41 
42 		float4 xQuad;
43 		float4 yQuad;
44 
45 		PlaneEquation z;
46 		PlaneEquation w;
47 
48 		union
49 		{
50 			struct
51 			{
52 				PlaneEquation C[2][4];
53 				PlaneEquation T[8][4];
54 				PlaneEquation f;
55 			};
56 
57 			PlaneEquation V[MAX_FRAGMENT_INPUTS][4];
58 		};
59 
60 		float area;
61 
62 		// Masks for two-sided stencil
63 		int64_t clockwiseMask;
64 		int64_t invClockwiseMask;
65 
66 		struct Span
67 		{
68 			unsigned short left;
69 			unsigned short right;
70 		};
71 
72 		// The rasterizer adds a zero length span to the top and bottom of the polygon to allow
73 		// for 2x2 pixel processing. We need an even number of spans to keep accesses aligned.
74 		Span outlineUnderflow[2];
75 		Span outline[OUTLINE_RESOLUTION];
76 		Span outlineOverflow[2];
77 	};
78 }
79 
80 #endif   // sw_Primitive_hpp
81