1 // Copyright 2009 Dolphin Emulator Project
2 // Licensed under GPLv2+
3 // Refer to the license.txt file included.
4 
5 #pragma once
6 
7 #include <array>
8 #include <cstddef>
9 
10 #include "Common/CommonTypes.h"
11 #include "VideoBackends/Software/Vec3.h"
12 
13 struct Vec4
14 {
15   float x;
16   float y;
17   float z;
18   float w;
19 };
20 
21 struct InputVertexData
22 {
23   u8 posMtx;
24   std::array<u8, 8> texMtx;
25 
26   Vec3 position;
27   std::array<Vec3, 3> normal;
28   std::array<std::array<u8, 4>, 2> color;
29   std::array<std::array<float, 2>, 8> texCoords;
30 };
31 
32 struct OutputVertexData
33 {
34   // components in color channels
35   enum
36   {
37     RED_C,
38     GRN_C,
39     BLU_C,
40     ALP_C
41   };
42 
43   Vec3 mvPosition = {};
44   Vec4 projectedPosition = {};
45   Vec3 screenPosition = {};
46   std::array<Vec3, 3> normal{};
47   std::array<std::array<u8, 4>, 2> color{};
48   std::array<Vec3, 8> texCoords{};
49 
LerpOutputVertexData50   void Lerp(float t, const OutputVertexData* a, const OutputVertexData* b)
51   {
52 #define LINTERP(T, OUT, IN) (OUT) + ((IN - OUT) * T)
53 
54 #define LINTERP_INT(T, OUT, IN) (OUT) + (((IN - OUT) * T) >> 8)
55 
56     mvPosition = LINTERP(t, a->mvPosition, b->mvPosition);
57 
58     projectedPosition.x = LINTERP(t, a->projectedPosition.x, b->projectedPosition.x);
59     projectedPosition.y = LINTERP(t, a->projectedPosition.y, b->projectedPosition.y);
60     projectedPosition.z = LINTERP(t, a->projectedPosition.z, b->projectedPosition.z);
61     projectedPosition.w = LINTERP(t, a->projectedPosition.w, b->projectedPosition.w);
62 
63     for (std::size_t i = 0; i < normal.size(); ++i)
64     {
65       normal[i] = LINTERP(t, a->normal[i], b->normal[i]);
66     }
67 
68     const u16 t_int = static_cast<u16>(t * 256);
69     for (std::size_t i = 0; i < color[0].size(); ++i)
70     {
71       color[0][i] = LINTERP_INT(t_int, a->color[0][i], b->color[0][i]);
72       color[1][i] = LINTERP_INT(t_int, a->color[1][i], b->color[1][i]);
73     }
74 
75     for (std::size_t i = 0; i < texCoords.size(); ++i)
76     {
77       texCoords[i] = LINTERP(t, a->texCoords[i], b->texCoords[i]);
78     }
79 
80 #undef LINTERP
81 #undef LINTERP_INT
82   }
83 };
84