| 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 | } |