1 | /* |
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2 | * cacaplas plasma effect for libcaca |
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3 | * Copyright (c) 2004 Sam Hocevar <sam@zoy.org> |
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4 | * 1998 Michele Bini <mibin@tin.it> |
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5 | * All Rights Reserved |
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6 | * |
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7 | * $Id: cacaplas.c 339 2004-01-12 14:25:46Z sam $ |
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8 | * |
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9 | * This program is free software; you can redistribute it and/or |
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10 | * modify it under the terms of the GNU Lesser General Public |
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11 | * License as published by the Free Software Foundation; either |
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12 | * version 2 of the License, or (at your option) any later version. |
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13 | * |
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14 | * This program is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * Lesser General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU Lesser General Public |
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20 | * License along with this program; if not, write to the Free Software |
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21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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22 | * 02111-1307 USA |
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23 | */ |
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24 | |
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25 | #include "config.h" |
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26 | |
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27 | #include <math.h> |
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28 | |
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29 | #ifndef M_PI |
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30 | # define M_PI 3.14159265358979323846 |
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31 | #endif |
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32 | |
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33 | #include "caca.h" |
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34 | |
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35 | /* Virtual buffer size */ |
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36 | #define XSIZ 256 |
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37 | #define YSIZ 256 |
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38 | |
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39 | #define TABLEX (XSIZ * 2) |
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40 | #define TABLEY (YSIZ * 2) |
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41 | |
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42 | static unsigned char screen[XSIZ * YSIZ]; |
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43 | static unsigned char table[TABLEX * TABLEY]; |
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44 | |
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45 | static void do_plasma(unsigned char *, |
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46 | double, double, double, double, double, double); |
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47 | |
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48 | int main (int argc, char **argv) |
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49 | { |
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50 | int red[256], green[256], blue[256], alpha[256]; |
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51 | double r[3], R[6]; |
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52 | struct caca_bitmap *bitmap; |
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53 | int i, x, y, frame; |
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54 | |
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55 | if(caca_init() < 0) |
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56 | return 1; |
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57 | |
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58 | caca_set_delay(20000); |
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59 | |
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60 | /* Fill various tables */ |
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61 | for(i = 0 ; i < 256; i++) |
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62 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
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63 | |
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64 | for(i = 0; i < 3; i++) |
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65 | r[i] = (double)(caca_rand(1, 1000)) / 30000 * M_PI; |
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66 | |
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67 | for(i = 0; i < 6; i++) |
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68 | R[i] = (double)(caca_rand(1, 1000)) / 5000; |
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69 | |
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70 | for(y = 0 ; y < TABLEY ; y++) |
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71 | for(x = 0 ; x < TABLEX ; x++) |
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72 | { |
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73 | double tmp = (((double)((x - (TABLEX / 2)) * (x - (TABLEX / 2)) |
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74 | + (y - (TABLEX / 2)) * (y - (TABLEX / 2)))) |
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75 | * (M_PI / (TABLEX * TABLEX + TABLEY * TABLEY))); |
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76 | |
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77 | table[x + y * TABLEX] = (1.0 + sin(12.0 * sqrt(tmp))) * 256 / 6; |
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78 | } |
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79 | |
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80 | /* Create a libcaca bitmap */ |
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81 | bitmap = caca_create_bitmap(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
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82 | |
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83 | /* Main loop */ |
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84 | for(frame = 0; !caca_get_event(CACA_EVENT_KEY_PRESS); frame++) |
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85 | { |
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86 | for(i = 0 ; i < 256; i++) |
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87 | { |
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88 | double z = ((double)i) / 256 * 6 * M_PI; |
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89 | |
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90 | red[i] = (1.0 + cos(z + r[0] * frame)) / 2 * 0xfff; |
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91 | green[i] = (1.0 + sin(z + r[1] * frame)) / 2 * 0xfff; |
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92 | blue[i] = (1.0 + cos(z + r[2] * frame)) / 2 * 0xfff; |
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93 | } |
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94 | |
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95 | /* Set the palette */ |
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96 | caca_set_bitmap_palette(bitmap, red, green, blue, alpha); |
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97 | |
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98 | do_plasma(screen, |
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99 | (1.0 + sin(((double)frame) * R[0])) / 2, |
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100 | (1.0 + sin(((double)frame) * R[1])) / 2, |
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101 | (1.0 + sin(((double)frame) * R[2])) / 2, |
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102 | (1.0 + sin(((double)frame) * R[3])) / 2, |
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103 | (1.0 + sin(((double)frame) * R[4])) / 2, |
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104 | (1.0 + sin(((double)frame) * R[5])) / 2); |
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105 | |
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106 | caca_draw_bitmap(0, 0, caca_get_width() - 1, caca_get_height() - 1, |
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107 | bitmap, screen); |
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108 | caca_refresh(); |
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109 | } |
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110 | |
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111 | caca_free_bitmap(bitmap); |
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112 | caca_end(); |
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113 | |
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114 | return 0; |
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115 | } |
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116 | |
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117 | static void do_plasma(unsigned char *pixels, double x_1, double y_1, |
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118 | double x_2, double y_2, double x_3, double y_3) |
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119 | { |
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120 | unsigned int X1 = x_1 * (TABLEX / 2), |
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121 | Y1 = y_1 * (TABLEY / 2), |
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122 | X2 = x_2 * (TABLEX / 2), |
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123 | Y2 = y_2 * (TABLEY / 2), |
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124 | X3 = x_3 * (TABLEX / 2), |
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125 | Y3 = y_3 * (TABLEY / 2); |
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126 | unsigned int y; |
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127 | unsigned char * t1 = table + X1 + Y1 * TABLEX, |
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128 | * t2 = table + X2 + Y2 * TABLEX, |
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129 | * t3 = table + X3 + Y3 * TABLEX; |
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130 | |
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131 | for(y = 0; y < YSIZ; y++) |
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132 | { |
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133 | unsigned int x; |
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134 | unsigned char * tmp = pixels + y * YSIZ; |
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135 | unsigned int ty = y * TABLEX, tmax = ty + XSIZ; |
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136 | for(x = 0; ty < tmax; ty++, tmp++) |
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137 | tmp[0] = t1[ty] + t2[ty] + t3[ty]; |
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138 | } |
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139 | } |
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140 | |
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