98e75f2d |
1 | /* |
2 | * Texture Filtering |
3 | * Version: 1.0 |
4 | * |
5 | * Copyright (C) 2007 Hiroshi Morii All Rights Reserved. |
6 | * Email koolsmoky(at)users.sourceforge.net |
7 | * Web http://www.3dfxzone.it/koolsmoky |
8 | * |
9 | * this is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2, or (at your option) |
12 | * any later version. |
13 | * |
14 | * this is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with GNU Make; see the file COPYING. If not, write to |
21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | */ |
23 | |
24 | /* Based on Derek Liauw Kie Fa and Rice1964 Super2xSaI code */ |
25 | |
26 | int row0, row1, row2, row3; |
27 | int col0, col1, col2, col3; |
28 | |
29 | uint16 x; |
30 | uint16 y; |
31 | |
32 | for (y = 0; y < height; y++) { |
33 | if ((y > 0) && (y < height - 1)) { |
34 | row0 = width; |
35 | row0 = -row0; |
36 | row1 = 0; |
37 | row2 = width; |
38 | row3 = (y == height - 2 ? width : width << 1); |
39 | } else { |
40 | row0 = 0; |
41 | row1 = 0; |
42 | row2 = 0; |
43 | row3 = 0; |
44 | } |
45 | |
46 | for (x = 0; x < width; x++) { |
47 | //--------------------------------------- B0 B1 B2 B3 |
48 | // 4 5 6 S2 |
49 | // 1 2 3 S1 |
50 | // A0 A1 A2 A3 |
51 | if ((x > 0) && (x < width - 1)) { |
52 | col0 = -1; |
53 | col1 = 0; |
54 | col2 = 1; |
55 | col3 = (x == width - 2 ? 1 : 2); |
56 | } else { |
57 | col0 = 0; |
58 | col1 = 0; |
59 | col2 = 0; |
60 | col3 = 0; |
61 | } |
62 | |
63 | colorB0 = *(srcPtr + col0 + row0); |
64 | colorB1 = *(srcPtr + col1 + row0); |
65 | colorB2 = *(srcPtr + col2 + row0); |
66 | colorB3 = *(srcPtr + col3 + row0); |
67 | |
68 | color4 = *(srcPtr + col0 + row1); |
69 | color5 = *(srcPtr + col1 + row1); |
70 | color6 = *(srcPtr + col2 + row1); |
71 | colorS2 = *(srcPtr + col3 + row1); |
72 | |
73 | color1 = *(srcPtr + col0 + row2); |
74 | color2 = *(srcPtr + col1 + row2); |
75 | color3 = *(srcPtr + col2 + row2); |
76 | colorS1 = *(srcPtr + col3 + row2); |
77 | |
78 | colorA0 = *(srcPtr + col0 + row3); |
79 | colorA1 = *(srcPtr + col1 + row3); |
80 | colorA2 = *(srcPtr + col2 + row3); |
81 | colorA3 = *(srcPtr + col3 + row3); |
82 | |
83 | //-------------------------------------- |
84 | if (color2 == color6 && color5 != color3) |
85 | product2b = product1b = color2; |
86 | else if (color5 == color3 && color2 != color6) |
87 | product2b = product1b = color5; |
88 | else if (color5 == color3 && color2 == color6) { |
89 | int r = 0; |
90 | |
91 | r += GET_RESULT(color6, color5, color1, colorA1); |
92 | r += GET_RESULT(color6, color5, color4, colorB1); |
93 | r += GET_RESULT(color6, color5, colorA2, colorS1); |
94 | r += GET_RESULT(color6, color5, colorB2, colorS2); |
95 | |
96 | if (r > 0) |
97 | product2b = product1b = color6; |
98 | else if (r < 0) |
99 | product2b = product1b = color5; |
100 | else |
101 | product2b = product1b = SAI_INTERPOLATE(color5, color6); |
102 | |
103 | } else { |
104 | |
105 | if (color6 == color3 && color3 == colorA1 && color2 != colorA2 && color3 != colorA0) |
106 | product2b = SAI_Q_INTERPOLATE(color3, color3, color3, color2); |
107 | else if (color5 == color2 && color2 == colorA2 && colorA1 != color3 && color2 != colorA3) |
108 | product2b = SAI_Q_INTERPOLATE(color2, color2, color2, color3); |
109 | else |
110 | product2b = SAI_INTERPOLATE(color2, color3); |
111 | |
112 | if (color6 == color3 && color6 == colorB1 && color5 != colorB2 && color6 != colorB0) |
113 | product1b = SAI_Q_INTERPOLATE(color6, color6, color6, color5); |
114 | else if (color5 == color2 && color5 == colorB2 && colorB1 != color6 && color5 != colorB3) |
115 | product1b = SAI_Q_INTERPOLATE(color6, color5, color5, color5); |
116 | else |
117 | product1b = SAI_INTERPOLATE(color5, color6); |
118 | } |
119 | |
120 | if (color5 == color3 && color2 != color6 && color4 == color5 && color5 != colorA2) |
121 | product2a = SAI_INTERPOLATE(color2, color5); |
122 | else if (color5 == color1 && color6 == color5 && color4 != color2 && color5 != colorA0) |
123 | product2a = SAI_INTERPOLATE(color2, color5); |
124 | else |
125 | product2a = color2; |
126 | |
127 | if (color2 == color6 && color5 != color3 && color1 == color2 && color2 != colorB2) |
128 | product1a = SAI_INTERPOLATE(color2, color5); |
129 | else if (color4 == color2 && color3 == color2 && color1 != color5 && color2 != colorB0) |
130 | product1a = SAI_INTERPOLATE(color2, color5); |
131 | else |
132 | product1a = color5; |
133 | |
134 | |
135 | destPtr[0] = product1a; |
136 | destPtr[1] = product1b; |
137 | destPtr[destWidth] = product2a; |
138 | destPtr[destWidth + 1] = product2b; |
139 | |
140 | srcPtr++; |
141 | destPtr += 2; |
142 | } |
143 | srcPtr += (pitch-width); |
144 | destPtr += (((pitch-width)<<1)+(pitch<<1)); |
145 | } |