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 "Device/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 	float pointCoordX;
46 	float pointCoordY;
47 	float pointSizeInv;
48 
49 	PlaneEquation z;
50 	float4 zBias;
51 	PlaneEquation w;
52 	PlaneEquation V[MAX_INTERFACE_COMPONENTS];
53 
54 	PlaneEquation clipDistance[MAX_CLIP_DISTANCES];
55 	PlaneEquation cullDistance[MAX_CULL_DISTANCES];
56 
57 	// Masks for two-sided stencil
58 	int64_t clockwiseMask;
59 	int64_t invClockwiseMask;
60 
61 	struct Span
62 	{
63 		unsigned short left;
64 		unsigned short right;
65 	};
66 
67 	// The rasterizer adds a zero length span to the top and bottom of the polygon to allow
68 	// for 2x2 pixel processing. We need an even number of spans to keep accesses aligned.
69 	Span outlineUnderflow[2];
70 	Span outline[OUTLINE_RESOLUTION];
71 	Span outlineOverflow[2];
72 };
73 
74 }  // namespace sw
75 
76 #endif  // sw_Primitive_hpp
77