1 | /* |
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2 | * cacademo various demo effects for libcaca |
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3 | * Copyright (c) 1998 Michele Bini <mibin@tin.it> |
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4 | * 2003-2004 Jean-Yves Lamoureux <jylam@lnxscene.org> |
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5 | * 2004 Sam Hocevar <sam@zoy.org> |
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6 | * All Rights Reserved |
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7 | * |
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8 | * $Id: cacademo.c 1027 2006-09-16 13:12:11Z sam $ |
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9 | * |
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10 | * This program is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the Do What The Fuck You Want To |
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12 | * Public License, Version 2, as published by Sam Hocevar. See |
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13 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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14 | */ |
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15 | |
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16 | #include "config.h" |
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17 | #include "common.h" |
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18 | |
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19 | #if !defined(__KERNEL__) |
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20 | # include <stdio.h> |
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21 | # include <stdlib.h> |
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22 | # include <string.h> |
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23 | # include <math.h> |
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24 | # ifndef M_PI |
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25 | # define M_PI 3.14159265358979323846 |
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26 | # endif |
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27 | #endif |
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28 | |
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29 | #include "cucul.h" |
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30 | #include "caca.h" |
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31 | |
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32 | enum action { INIT, UPDATE, DRAW, FREE }; |
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33 | |
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34 | void plasma(enum action, cucul_canvas_t *); |
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35 | void metaballs(enum action, cucul_canvas_t *); |
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36 | void moire(enum action, cucul_canvas_t *); |
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37 | |
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38 | void (*demo_list[])(enum action, cucul_canvas_t *) = |
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39 | { |
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40 | plasma, |
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41 | metaballs, |
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42 | moire, |
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43 | }; |
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44 | |
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45 | /* Common macros for dither-based demos */ |
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46 | #define XSIZ 256 |
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47 | #define YSIZ 256 |
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48 | |
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49 | /* Global variables */ |
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50 | static int frame = 0; |
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51 | |
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52 | int main(int argc, char **argv) |
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53 | { |
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54 | static caca_display_t *dp; |
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55 | static cucul_canvas_t *frontcv, *backcv, *mask; |
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56 | int demo = 0, pause = 0; |
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57 | |
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58 | /* Set up two canvases, a mask, and attach a display to the front one */ |
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59 | frontcv = cucul_create_canvas(0, 0); |
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60 | backcv = cucul_create_canvas(0, 0); |
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61 | mask = cucul_create_canvas(0, 0); |
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62 | |
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63 | dp = caca_create_display(frontcv); |
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64 | if(!dp) |
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65 | return 1; |
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66 | |
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67 | cucul_set_canvas_size(backcv, cucul_get_canvas_width(frontcv), |
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68 | cucul_get_canvas_height(frontcv)); |
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69 | cucul_set_canvas_size(mask, cucul_get_canvas_width(frontcv), |
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70 | cucul_get_canvas_height(frontcv)); |
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71 | |
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72 | caca_set_display_time(dp, 20000); |
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73 | |
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74 | demo = cucul_rand(0, 3); |
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75 | |
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76 | demo_list[demo](INIT, NULL); |
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77 | |
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78 | for(;;) |
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79 | { |
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80 | caca_event_t ev; |
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81 | if(caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0)) |
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82 | { |
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83 | switch(ev.data.key.ch) |
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84 | { |
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85 | case CACA_KEY_ESCAPE: goto end; |
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86 | case ' ': pause = !pause; |
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87 | } |
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88 | } |
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89 | |
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90 | if(pause) |
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91 | goto paused; |
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92 | |
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93 | demo_list[demo](UPDATE, NULL); |
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94 | frame++; |
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95 | paused: |
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96 | demo_list[demo](DRAW, frontcv); |
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97 | cucul_set_color(frontcv, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLUE); |
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98 | cucul_putstr(frontcv, cucul_get_canvas_width(frontcv) - 30, |
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99 | cucul_get_canvas_height(frontcv) - 2, |
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100 | " -=[ Powered by libcaca ]=- "); |
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101 | caca_refresh_display(dp); |
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102 | } |
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103 | end: |
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104 | demo_list[demo](FREE, NULL); |
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105 | |
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106 | caca_free_display(dp); |
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107 | cucul_free_canvas(mask); |
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108 | cucul_free_canvas(backcv); |
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109 | cucul_free_canvas(frontcv); |
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110 | |
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111 | return 0; |
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112 | } |
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113 | |
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114 | /* The plasma effect */ |
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115 | #define TABLEX (XSIZ * 2) |
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116 | #define TABLEY (YSIZ * 2) |
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117 | static uint8_t table[TABLEX * TABLEY]; |
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118 | |
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119 | static void do_plasma(uint8_t *, |
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120 | double, double, double, double, double, double); |
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121 | |
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122 | void plasma(enum action action, cucul_canvas_t *cv) |
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123 | { |
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124 | static cucul_dither_t *dither; |
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125 | static uint8_t *screen; |
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126 | static unsigned int red[256], green[256], blue[256], alpha[256]; |
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127 | static double r[3], R[6]; |
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128 | |
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129 | int i, x, y; |
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130 | |
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131 | switch(action) |
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132 | { |
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133 | case INIT: |
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134 | screen = malloc(XSIZ * YSIZ * sizeof(uint8_t)); |
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135 | |
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136 | /* Fill various tables */ |
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137 | for(i = 0 ; i < 256; i++) |
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138 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
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139 | |
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140 | for(i = 0; i < 3; i++) |
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141 | r[i] = (double)(cucul_rand(1, 1000)) / 60000 * M_PI; |
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142 | |
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143 | for(i = 0; i < 6; i++) |
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144 | R[i] = (double)(cucul_rand(1, 1000)) / 10000; |
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145 | |
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146 | for(y = 0 ; y < TABLEY ; y++) |
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147 | for(x = 0 ; x < TABLEX ; x++) |
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148 | { |
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149 | double tmp = (((double)((x - (TABLEX / 2)) * (x - (TABLEX / 2)) |
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150 | + (y - (TABLEX / 2)) * (y - (TABLEX / 2)))) |
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151 | * (M_PI / (TABLEX * TABLEX + TABLEY * TABLEY))); |
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152 | |
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153 | table[x + y * TABLEX] = (1.0 + sin(12.0 * sqrt(tmp))) * 256 / 6; |
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154 | } |
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155 | |
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156 | /* Create a libcucul dither */ |
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157 | dither = cucul_create_dither(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
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158 | break; |
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159 | |
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160 | case UPDATE: |
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161 | for(i = 0 ; i < 256; i++) |
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162 | { |
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163 | double z = ((double)i) / 256 * 6 * M_PI; |
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164 | |
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165 | red[i] = (1.0 + sin(z + r[1] * frame)) / 2 * 0xfff; |
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166 | blue[i] = (1.0 + cos(z + r[0] * frame)) / 2 * 0xfff; |
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167 | green[i] = (1.0 + cos(z + r[2] * frame)) / 2 * 0xfff; |
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168 | } |
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169 | |
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170 | /* Set the palette */ |
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171 | cucul_set_dither_palette(dither, red, green, blue, alpha); |
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172 | |
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173 | do_plasma(screen, |
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174 | (1.0 + sin(((double)frame) * R[0])) / 2, |
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175 | (1.0 + sin(((double)frame) * R[1])) / 2, |
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176 | (1.0 + sin(((double)frame) * R[2])) / 2, |
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177 | (1.0 + sin(((double)frame) * R[3])) / 2, |
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178 | (1.0 + sin(((double)frame) * R[4])) / 2, |
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179 | (1.0 + sin(((double)frame) * R[5])) / 2); |
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180 | break; |
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181 | case DRAW: |
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182 | cucul_dither_bitmap(cv, 0, 0, |
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183 | cucul_get_canvas_width(cv), |
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184 | cucul_get_canvas_height(cv), |
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185 | dither, screen); |
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186 | break; |
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187 | case FREE: |
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188 | free(screen); |
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189 | cucul_free_dither(dither); |
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190 | break; |
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191 | } |
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192 | } |
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193 | |
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194 | static void do_plasma(uint8_t *pixels, double x_1, double y_1, |
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195 | double x_2, double y_2, double x_3, double y_3) |
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196 | { |
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197 | unsigned int X1 = x_1 * (TABLEX / 2), |
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198 | Y1 = y_1 * (TABLEY / 2), |
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199 | X2 = x_2 * (TABLEX / 2), |
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200 | Y2 = y_2 * (TABLEY / 2), |
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201 | X3 = x_3 * (TABLEX / 2), |
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202 | Y3 = y_3 * (TABLEY / 2); |
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203 | unsigned int y; |
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204 | uint8_t * t1 = table + X1 + Y1 * TABLEX, |
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205 | * t2 = table + X2 + Y2 * TABLEX, |
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206 | * t3 = table + X3 + Y3 * TABLEX; |
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207 | |
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208 | for(y = 0; y < YSIZ; y++) |
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209 | { |
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210 | unsigned int x; |
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211 | uint8_t * tmp = pixels + y * YSIZ; |
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212 | unsigned int ty = y * TABLEX, tmax = ty + XSIZ; |
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213 | for(x = 0; ty < tmax; ty++, tmp++) |
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214 | tmp[0] = t1[ty] + t2[ty] + t3[ty]; |
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215 | } |
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216 | } |
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217 | |
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218 | /* The metaball effect */ |
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219 | #define METASIZE (XSIZ/2) |
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220 | #define METABALLS 12 |
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221 | #define CROPBALL 200 /* Colour index where to crop balls */ |
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222 | static uint8_t metaball[METASIZE * METASIZE]; |
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223 | |
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224 | static void create_ball(void); |
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225 | static void draw_ball(uint8_t *, unsigned int, unsigned int); |
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226 | |
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227 | void metaballs(enum action action, cucul_canvas_t *cv) |
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228 | { |
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229 | static cucul_dither_t *cucul_dither; |
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230 | static uint8_t *screen; |
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231 | static unsigned int r[256], g[256], b[256], a[256]; |
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232 | static float dd[METABALLS], di[METABALLS], dj[METABALLS], dk[METABALLS]; |
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233 | static unsigned int x[METABALLS], y[METABALLS]; |
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234 | static float i = 10.0, j = 17.0, k = 11.0; |
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235 | static double offset[360 + 80]; |
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236 | |
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237 | int p, angle; |
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238 | |
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239 | switch(action) |
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240 | { |
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241 | case INIT: |
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242 | screen = malloc(XSIZ * YSIZ * sizeof(uint8_t)); |
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243 | |
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244 | /* Make the palette eatable by libcaca */ |
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245 | for(p = 0; p < 256; p++) |
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246 | r[p] = g[p] = b[p] = a[p] = 0x0; |
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247 | r[255] = g[255] = b[255] = 0xfff; |
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248 | |
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249 | /* Create a libcucul dither smaller than our pixel buffer, so that we |
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250 | * display only the interesting part of it */ |
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251 | cucul_dither = cucul_create_dither(8, XSIZ - METASIZE, YSIZ - METASIZE, |
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252 | XSIZ, 0, 0, 0, 0); |
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253 | /* Generate ball sprite */ |
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254 | create_ball(); |
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255 | |
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256 | for(p = 0; p < METABALLS; p++) |
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257 | { |
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258 | dd[p] = cucul_rand(0, 100); |
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259 | di[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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260 | dj[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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261 | dk[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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262 | } |
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263 | |
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264 | for(p = 0; p < 360 + 80; p++) |
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265 | offset[p] = 1.0 + sin((double)(p * M_PI / 60)); |
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266 | break; |
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267 | |
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268 | case UPDATE: |
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269 | angle = frame % 360; |
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270 | |
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271 | /* Crop the palette */ |
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272 | for(p = CROPBALL; p < 255; p++) |
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273 | { |
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274 | int t1, t2, t3; |
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275 | double c1 = offset[angle]; |
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276 | double c2 = offset[angle + 40]; |
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277 | double c3 = offset[angle + 80]; |
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278 | |
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279 | t1 = p < 0x40 ? 0 : p < 0xc0 ? (p - 0x40) * 0x20 : 0xfff; |
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280 | t2 = p < 0xe0 ? 0 : (p - 0xe0) * 0x80; |
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281 | t3 = p < 0x40 ? p * 0x40 : 0xfff; |
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282 | |
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283 | r[p] = (c1 * t1 + c2 * t2 + c3 * t3) / 4; |
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284 | g[p] = (c1 * t2 + c2 * t3 + c3 * t1) / 4; |
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285 | b[p] = (c1 * t3 + c2 * t1 + c3 * t2) / 4; |
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286 | } |
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287 | |
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288 | /* Set the palette */ |
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289 | cucul_set_dither_palette(cucul_dither, r, g, b, a); |
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290 | |
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291 | /* Silly paths for our balls */ |
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292 | for(p = 0; p < METABALLS; p++) |
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293 | { |
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294 | float u = di[p] * i + dj[p] * j + dk[p] * sin(di[p] * k); |
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295 | float v = dd[p] + di[p] * j + dj[p] * k + dk[p] * sin(dk[p] * i); |
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296 | u = sin(i + u * 2.1) * (1.0 + sin(u)); |
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297 | v = sin(j + v * 1.9) * (1.0 + sin(v)); |
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298 | x[p] = (XSIZ - METASIZE) / 2 + u * (XSIZ - METASIZE) / 4; |
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299 | y[p] = (YSIZ - METASIZE) / 2 + v * (YSIZ - METASIZE) / 4; |
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300 | } |
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301 | |
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302 | i += 0.011; |
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303 | j += 0.017; |
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304 | k += 0.019; |
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305 | |
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306 | memset(screen, 0, XSIZ * YSIZ); |
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307 | |
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308 | /* Here is all the trick. Maybe if you're that |
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309 | * clever you'll understand. */ |
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310 | for(p = 0; p < METABALLS; p++) |
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311 | draw_ball(screen, x[p], y[p]); |
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312 | break; |
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313 | |
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314 | case DRAW: |
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315 | cucul_dither_bitmap(cv, 0, 0, |
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316 | cucul_get_canvas_width(cv), |
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317 | cucul_get_canvas_height(cv), |
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318 | cucul_dither, screen + (METASIZE / 2) * (1 + XSIZ)); |
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319 | break; |
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320 | |
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321 | case FREE: |
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322 | free(screen); |
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323 | cucul_free_dither(cucul_dither); |
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324 | break; |
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325 | } |
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326 | } |
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327 | |
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328 | /* Generate ball sprite |
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329 | * You should read the comments, I already wrote that before ... */ |
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330 | static void create_ball(void) |
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331 | { |
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332 | int x, y; |
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333 | float distance; |
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334 | |
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335 | for(y = 0; y < METASIZE; y++) |
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336 | for(x = 0; x < METASIZE; x++) |
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337 | { |
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338 | distance = ((METASIZE/2) - x) * ((METASIZE/2) - x) |
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339 | + ((METASIZE/2) - y) * ((METASIZE/2) - y); |
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340 | distance = sqrt(distance) * 64 / METASIZE; |
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341 | metaball[x + y * METASIZE] = distance > 15 ? 0 : (255 - distance) * 15; |
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342 | } |
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343 | } |
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344 | |
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345 | /* You missed the trick ? */ |
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346 | static void draw_ball(uint8_t *screen, unsigned int bx, unsigned int by) |
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347 | { |
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348 | unsigned int color; |
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349 | unsigned int i, e = 0; |
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350 | unsigned int b = (by * XSIZ) + bx; |
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351 | |
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352 | for(i = 0; i < METASIZE * METASIZE; i++) |
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353 | { |
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354 | color = screen[b] + metaball[i]; |
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355 | |
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356 | if(color > 255) |
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357 | color = 255; |
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358 | |
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359 | screen[b] = color; |
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360 | if(e == METASIZE) |
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361 | { |
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362 | e = 0; |
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363 | b += XSIZ - METASIZE; |
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364 | } |
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365 | b++; |
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366 | e++; |
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367 | } |
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368 | } |
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369 | |
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370 | /* The moiré effect */ |
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371 | #define DISCSIZ (XSIZ*2) |
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372 | #define DISCTHICKNESS (XSIZ*15/40) |
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373 | static uint8_t disc[DISCSIZ * DISCSIZ]; |
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374 | |
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375 | static void put_disc(uint8_t *, int, int); |
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376 | static void draw_disc(int, char); |
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377 | static void draw_line(int, int, char); |
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378 | |
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379 | void moire(enum action action, cucul_canvas_t *cv) |
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380 | { |
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381 | static cucul_dither_t *dither; |
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382 | static uint8_t *screen; |
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383 | static unsigned int red[256], green[256], blue[256], alpha[256]; |
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384 | |
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385 | int i, x, y; |
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386 | |
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387 | switch(action) |
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388 | { |
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389 | case INIT: |
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390 | screen = malloc(XSIZ * YSIZ * sizeof(uint8_t)); |
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391 | |
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392 | /* Fill various tables */ |
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393 | for(i = 0 ; i < 256; i++) |
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394 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
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395 | |
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396 | red[0] = green[0] = blue[0] = 0x777; |
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397 | red[1] = green[1] = blue[1] = 0xfff; |
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398 | |
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399 | /* Fill the circle */ |
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400 | for(i = DISCSIZ * 2; i > 0; i -= DISCTHICKNESS) |
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401 | draw_disc(i, (i / DISCTHICKNESS) % 2); |
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402 | |
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403 | /* Create a libcucul dither */ |
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404 | dither = cucul_create_dither(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
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405 | break; |
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406 | |
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407 | case UPDATE: |
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408 | memset(screen, 0, XSIZ * YSIZ); |
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409 | |
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410 | /* Set the palette */ |
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411 | red[0] = 0.5 * (1 + sin(0.05 * frame)) * 0xfff; |
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412 | green[0] = 0.5 * (1 + cos(0.07 * frame)) * 0xfff; |
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413 | blue[0] = 0.5 * (1 + cos(0.06 * frame)) * 0xfff; |
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414 | |
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415 | red[1] = 0.5 * (1 + sin(0.07 * frame + 5.0)) * 0xfff; |
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416 | green[1] = 0.5 * (1 + cos(0.06 * frame + 5.0)) * 0xfff; |
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417 | blue[1] = 0.5 * (1 + cos(0.05 * frame + 5.0)) * 0xfff; |
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418 | |
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419 | cucul_set_dither_palette(dither, red, green, blue, alpha); |
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420 | |
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421 | /* Draw circles */ |
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422 | x = cos(0.07 * frame + 5.0) * 128.0 + (XSIZ / 2); |
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423 | y = sin(0.11 * frame) * 128.0 + (YSIZ / 2); |
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424 | put_disc(screen, x, y); |
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425 | |
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426 | x = cos(0.13 * frame + 2.0) * 64.0 + (XSIZ / 2); |
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427 | y = sin(0.09 * frame + 1.0) * 64.0 + (YSIZ / 2); |
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428 | put_disc(screen, x, y); |
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429 | break; |
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430 | |
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431 | case DRAW: |
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432 | cucul_dither_bitmap(cv, 0, 0, |
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433 | cucul_get_canvas_width(cv), |
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434 | cucul_get_canvas_height(cv), |
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435 | dither, screen); |
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436 | break; |
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437 | |
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438 | case FREE: |
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439 | free(screen); |
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440 | cucul_free_dither(dither); |
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441 | break; |
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442 | } |
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443 | } |
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444 | |
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445 | static void put_disc(uint8_t *screen, int x, int y) |
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446 | { |
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447 | char *src = ((char*)disc) + (DISCSIZ / 2 - x) + (DISCSIZ / 2 - y) * DISCSIZ; |
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448 | int i, j; |
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449 | |
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450 | for(j = 0; j < YSIZ; j++) |
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451 | for(i = 0; i < XSIZ; i++) |
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452 | { |
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453 | screen[i + XSIZ * j] ^= src[i + DISCSIZ * j]; |
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454 | } |
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455 | } |
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456 | |
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457 | static void draw_disc(int r, char color) |
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458 | { |
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459 | int t, dx, dy; |
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460 | |
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461 | for(t = 0, dx = 0, dy = r; dx <= dy; dx++) |
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462 | { |
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463 | draw_line(dx / 3, dy / 3, color); |
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464 | draw_line(dy / 3, dx / 3, color); |
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465 | |
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466 | t += t > 0 ? dx - dy-- : dx; |
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467 | } |
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468 | } |
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469 | |
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470 | static void draw_line(int x, int y, char color) |
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471 | { |
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472 | if(x == 0 || y == 0 || y > DISCSIZ / 2) |
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473 | return; |
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474 | |
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475 | if(x > DISCSIZ / 2) |
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476 | x = DISCSIZ / 2; |
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477 | |
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478 | memset(disc + (DISCSIZ / 2) - x + DISCSIZ * ((DISCSIZ / 2) - y), |
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479 | color, 2 * x - 1); |
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480 | memset(disc + (DISCSIZ / 2) - x + DISCSIZ * ((DISCSIZ / 2) + y - 1), |
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481 | color, 2 * x - 1); |
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482 | } |
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483 | |
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