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 | * 2003-2006 Jean-Yves Lamoureux <jylam@lnxscene.org> |
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5 | * 2004-2006 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 2299 2008-04-19 12:42:50Z sam $ |
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9 | * |
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10 | * This program is free software. It comes without any warranty, to |
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11 | * the extent permitted by applicable law. You can redistribute it |
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12 | * and/or modify it under the terms of the Do What The Fuck You Want |
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13 | * To Public License, Version 2, as published by Sam Hocevar. See |
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14 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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15 | */ |
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16 | |
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17 | #include "config.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 { PREPARE, INIT, UPDATE, RENDER, FREE }; |
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33 | |
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34 | void transition(cucul_canvas_t *, int, int); |
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35 | void plasma(enum action, cucul_canvas_t *); |
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36 | void metaballs(enum action, cucul_canvas_t *); |
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37 | void moire(enum action, cucul_canvas_t *); |
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38 | void langton(enum action, cucul_canvas_t *); |
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39 | void matrix(enum action, cucul_canvas_t *); |
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40 | void rotozoom(enum action, cucul_canvas_t *); |
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41 | |
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42 | void (*fn[])(enum action, cucul_canvas_t *) = |
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43 | { |
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44 | plasma, |
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45 | metaballs, |
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46 | moire, |
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47 | /*langton,*/ |
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48 | matrix, |
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49 | rotozoom, |
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50 | }; |
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51 | #define DEMOS (sizeof(fn)/sizeof(*fn)) |
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52 | |
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53 | #define DEMO_FRAMES cucul_rand(500, 1000) |
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54 | #define TRANSITION_FRAMES 40 |
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55 | |
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56 | #define TRANSITION_COUNT 5 |
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57 | #define TRANSITION_CIRCLE 0 |
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58 | #define TRANSITION_STAR 1 |
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59 | #define TRANSITION_SQUARE 2 |
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60 | #define TRANSITION_VLINES 3 |
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61 | #define TRANSITION_HLINES 4 |
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62 | |
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63 | /* Common macros for dither-based demos */ |
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64 | #define XSIZ 256 |
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65 | #define YSIZ 256 |
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66 | |
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67 | /* Global variables */ |
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68 | static int frame = 0; |
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69 | |
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70 | int main(int argc, char **argv) |
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71 | { |
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72 | static caca_display_t *dp; |
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73 | static cucul_canvas_t *frontcv, *backcv, *mask; |
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74 | |
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75 | int demo, next = -1, pause = 0, next_transition = DEMO_FRAMES; |
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76 | unsigned int i; |
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77 | int tmode = cucul_rand(0, TRANSITION_COUNT); |
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78 | |
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79 | /* Set up two canvases, a mask, and attach a display to the front one */ |
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80 | frontcv = cucul_create_canvas(0, 0); |
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81 | backcv = cucul_create_canvas(0, 0); |
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82 | mask = cucul_create_canvas(0, 0); |
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83 | |
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84 | dp = caca_create_display(frontcv); |
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85 | if(!dp) |
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86 | return 1; |
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87 | |
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88 | cucul_set_canvas_size(backcv, cucul_get_canvas_width(frontcv), |
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89 | cucul_get_canvas_height(frontcv)); |
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90 | cucul_set_canvas_size(mask, cucul_get_canvas_width(frontcv), |
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91 | cucul_get_canvas_height(frontcv)); |
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92 | |
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93 | caca_set_display_time(dp, 20000); |
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94 | |
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95 | /* Initialise all demos' lookup tables */ |
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96 | for(i = 0; i < DEMOS; i++) |
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97 | fn[i](PREPARE, frontcv); |
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98 | |
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99 | /* Choose a demo at random */ |
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100 | demo = cucul_rand(0, DEMOS); |
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101 | fn[demo](INIT, frontcv); |
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102 | |
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103 | for(;;) |
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104 | { |
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105 | /* Handle events */ |
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106 | caca_event_t ev; |
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107 | while(caca_get_event(dp, CACA_EVENT_KEY_PRESS |
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108 | | CACA_EVENT_QUIT, &ev, 0)) |
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109 | { |
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110 | if(caca_get_event_type(&ev) == CACA_EVENT_QUIT) |
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111 | goto end; |
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112 | |
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113 | switch(caca_get_event_key_ch(&ev)) |
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114 | { |
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115 | case CACA_KEY_ESCAPE: |
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116 | case CACA_KEY_CTRL_C: |
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117 | case CACA_KEY_CTRL_Z: |
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118 | goto end; |
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119 | case ' ': |
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120 | pause = !pause; |
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121 | break; |
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122 | case '\r': |
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123 | if(next == -1) |
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124 | next_transition = frame; |
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125 | break; |
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126 | } |
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127 | } |
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128 | |
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129 | /* Resize the spare canvas, just in case the main one changed */ |
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130 | cucul_set_canvas_size(backcv, cucul_get_canvas_width(frontcv), |
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131 | cucul_get_canvas_height(frontcv)); |
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132 | cucul_set_canvas_size(mask, cucul_get_canvas_width(frontcv), |
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133 | cucul_get_canvas_height(frontcv)); |
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134 | |
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135 | if(pause) |
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136 | goto paused; |
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137 | |
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138 | /* Update demo's data */ |
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139 | fn[demo](UPDATE, frontcv); |
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140 | |
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141 | /* Handle transitions */ |
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142 | if(frame == next_transition) |
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143 | { |
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144 | next = cucul_rand(0, DEMOS); |
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145 | if(next == demo) |
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146 | next = (next + 1) % DEMOS; |
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147 | fn[next](INIT, backcv); |
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148 | } |
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149 | else if(frame == next_transition + TRANSITION_FRAMES) |
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150 | { |
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151 | fn[demo](FREE, frontcv); |
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152 | demo = next; |
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153 | next = -1; |
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154 | next_transition = frame + DEMO_FRAMES; |
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155 | tmode = cucul_rand(0, TRANSITION_COUNT); |
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156 | } |
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157 | |
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158 | if(next != -1) |
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159 | fn[next](UPDATE, backcv); |
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160 | |
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161 | frame++; |
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162 | paused: |
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163 | /* Render main demo's canvas */ |
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164 | fn[demo](RENDER, frontcv); |
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165 | |
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166 | /* If a transition is on its way, render it */ |
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167 | if(next != -1) |
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168 | { |
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169 | fn[next](RENDER, backcv); |
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170 | cucul_set_color_ansi(mask, CUCUL_LIGHTGRAY, CUCUL_BLACK); |
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171 | cucul_clear_canvas(mask); |
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172 | cucul_set_color_ansi(mask, CUCUL_WHITE, CUCUL_WHITE); |
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173 | transition(mask, tmode, |
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174 | 100 * (frame - next_transition) / TRANSITION_FRAMES); |
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175 | cucul_blit(frontcv, 0, 0, backcv, mask); |
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176 | } |
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177 | |
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178 | cucul_set_color_ansi(frontcv, CUCUL_WHITE, CUCUL_BLUE); |
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179 | if(frame < 100) |
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180 | cucul_put_str(frontcv, cucul_get_canvas_width(frontcv) - 30, |
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181 | cucul_get_canvas_height(frontcv) - 2, |
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182 | " -=[ Powered by libcaca ]=- "); |
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183 | caca_refresh_display(dp); |
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184 | } |
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185 | end: |
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186 | if(next != -1) |
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187 | fn[next](FREE, frontcv); |
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188 | fn[demo](FREE, frontcv); |
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189 | |
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190 | caca_free_display(dp); |
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191 | cucul_free_canvas(mask); |
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192 | cucul_free_canvas(backcv); |
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193 | cucul_free_canvas(frontcv); |
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194 | |
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195 | return 0; |
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196 | } |
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197 | |
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198 | /* Transitions */ |
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199 | void transition(cucul_canvas_t *mask, int tmode, int completed) |
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200 | { |
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201 | static float const star[] = |
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202 | { |
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203 | 0.000000, -1.000000, |
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204 | 0.308000, -0.349000, |
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205 | 0.992000, -0.244000, |
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206 | 0.500000, 0.266000, |
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207 | 0.632000, 0.998000, |
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208 | 0.008000, 0.659000, |
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209 | -0.601000, 0.995000, |
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210 | -0.496000, 0.275000, |
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211 | -0.997000, -0.244000, |
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212 | -0.313000, -0.349000 |
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213 | }; |
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214 | static float star_rot[sizeof(star)/sizeof(*star)]; |
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215 | |
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216 | |
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217 | static float const square[] = |
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218 | { |
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219 | -1, -1, |
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220 | 1, -1, |
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221 | 1, 1, |
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222 | -1, 1 |
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223 | }; |
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224 | static float square_rot[sizeof(square)/sizeof(*square)]; |
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225 | |
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226 | float mulx = 0.0075f * completed * cucul_get_canvas_width(mask); |
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227 | float muly = 0.0075f * completed * cucul_get_canvas_height(mask); |
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228 | int w2 = cucul_get_canvas_width(mask) / 2; |
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229 | int h2 = cucul_get_canvas_height(mask) / 2; |
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230 | float angle = (0.0075f * completed * 360) * 3.14 / 180, x, y; |
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231 | unsigned int i; |
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232 | int w = cucul_get_canvas_width(mask); |
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233 | int h = cucul_get_canvas_height(mask); |
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234 | |
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235 | switch(tmode) |
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236 | { |
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237 | case TRANSITION_SQUARE: |
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238 | /* Compute rotated coordinates */ |
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239 | for(i = 0; i < (sizeof(square) / sizeof(*square)) / 2; i++) |
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240 | { |
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241 | x = square[i * 2]; |
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242 | y = square[i * 2 + 1]; |
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243 | |
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244 | square_rot[i * 2] = x * cos(angle) - y * sin(angle); |
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245 | square_rot[i * 2 + 1] = y * cos(angle) + x * sin(angle); |
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246 | } |
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247 | |
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248 | mulx *= 1.8; |
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249 | muly *= 1.8; |
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250 | cucul_fill_triangle(mask, |
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251 | square_rot[0*2] * mulx + w2, square_rot[0*2+1] * muly + h2, \ |
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252 | square_rot[1*2] * mulx + w2, square_rot[1*2+1] * muly + h2, \ |
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253 | square_rot[2*2] * mulx + w2, square_rot[2*2+1] * muly + h2, '#'); |
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254 | cucul_fill_triangle(mask, |
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255 | square_rot[0*2] * mulx + w2, square_rot[0*2+1] * muly + h2, \ |
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256 | square_rot[2*2] * mulx + w2, square_rot[2*2+1] * muly + h2, \ |
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257 | square_rot[3*2] * mulx + w2, square_rot[3*2+1] * muly + h2, '#'); |
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258 | break; |
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259 | |
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260 | |
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261 | case TRANSITION_STAR: |
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262 | /* Compute rotated coordinates */ |
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263 | for(i = 0; i < (sizeof(star) / sizeof(*star)) / 2; i++) |
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264 | { |
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265 | x = star[i * 2]; |
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266 | y = star[i * 2 + 1]; |
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267 | |
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268 | star_rot[i * 2] = x * cos(angle) - y * sin(angle); |
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269 | star_rot[i * 2 + 1] = y * cos(angle) + x * sin(angle); |
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270 | } |
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271 | |
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272 | mulx *= 1.8; |
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273 | muly *= 1.8; |
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274 | |
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275 | #define DO_TRI(a, b, c) \ |
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276 | cucul_fill_triangle(mask, \ |
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277 | star_rot[(a)*2] * mulx + w2, star_rot[(a)*2+1] * muly + h2, \ |
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278 | star_rot[(b)*2] * mulx + w2, star_rot[(b)*2+1] * muly + h2, \ |
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279 | star_rot[(c)*2] * mulx + w2, star_rot[(c)*2+1] * muly + h2, '#') |
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280 | DO_TRI(0, 1, 9); |
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281 | DO_TRI(1, 2, 3); |
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282 | DO_TRI(3, 4, 5); |
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283 | DO_TRI(5, 6, 7); |
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284 | DO_TRI(7, 8, 9); |
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285 | DO_TRI(9, 1, 5); |
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286 | DO_TRI(9, 5, 7); |
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287 | DO_TRI(1, 3, 5); |
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288 | break; |
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289 | |
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290 | case TRANSITION_CIRCLE: |
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291 | cucul_fill_ellipse(mask, w2, h2, mulx, muly, '#'); |
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292 | break; |
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293 | |
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294 | case TRANSITION_VLINES: |
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295 | for(i = 0; i < 8; i++) |
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296 | { |
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297 | int z = ((i & 1) ? w : (-w)/2) * (100 - completed) / 100; |
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298 | cucul_fill_box(mask, i * w / 8, z , (w / 8) + 1, z + h, '#'); |
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299 | } |
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300 | break; |
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301 | |
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302 | case TRANSITION_HLINES: |
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303 | |
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304 | for(i = 0; i < 6; i++) |
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305 | { |
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306 | int z = ((i & 1) ? w : (-w)/2) * (100 - completed) / 100; |
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307 | cucul_fill_box(mask, z, i * h / 6, z + w, (h / 6) + 1, '#'); |
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308 | } |
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309 | break; |
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310 | } |
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311 | } |
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312 | |
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313 | /* The plasma effect */ |
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314 | #define TABLEX (XSIZ * 2) |
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315 | #define TABLEY (YSIZ * 2) |
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316 | static uint8_t table[TABLEX * TABLEY]; |
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317 | |
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318 | static void do_plasma(uint8_t *, |
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319 | double, double, double, double, double, double); |
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320 | |
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321 | void plasma(enum action action, cucul_canvas_t *cv) |
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322 | { |
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323 | static cucul_dither_t *dither; |
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324 | static uint8_t *screen; |
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325 | static unsigned int red[256], green[256], blue[256], alpha[256]; |
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326 | static double r[3], R[6]; |
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327 | |
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328 | int i, x, y; |
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329 | |
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330 | switch(action) |
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331 | { |
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332 | case PREPARE: |
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333 | /* Fill various tables */ |
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334 | for(i = 0 ; i < 256; i++) |
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335 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
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336 | |
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337 | for(i = 0; i < 3; i++) |
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338 | r[i] = (double)(cucul_rand(1, 1000)) / 60000 * M_PI; |
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339 | |
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340 | for(i = 0; i < 6; i++) |
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341 | R[i] = (double)(cucul_rand(1, 1000)) / 10000; |
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342 | |
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343 | for(y = 0 ; y < TABLEY ; y++) |
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344 | for(x = 0 ; x < TABLEX ; x++) |
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345 | { |
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346 | double tmp = (((double)((x - (TABLEX / 2)) * (x - (TABLEX / 2)) |
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347 | + (y - (TABLEX / 2)) * (y - (TABLEX / 2)))) |
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348 | * (M_PI / (TABLEX * TABLEX + TABLEY * TABLEY))); |
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349 | |
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350 | table[x + y * TABLEX] = (1.0 + sin(12.0 * sqrt(tmp))) * 256 / 6; |
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351 | } |
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352 | break; |
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353 | |
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354 | case INIT: |
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355 | screen = malloc(XSIZ * YSIZ * sizeof(uint8_t)); |
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356 | dither = cucul_create_dither(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
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357 | break; |
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358 | |
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359 | case UPDATE: |
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360 | for(i = 0 ; i < 256; i++) |
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361 | { |
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362 | double z = ((double)i) / 256 * 6 * M_PI; |
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363 | |
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364 | red[i] = (1.0 + sin(z + r[1] * frame)) / 2 * 0xfff; |
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365 | blue[i] = (1.0 + cos(z + r[0] * (frame + 100))) / 2 * 0xfff; |
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366 | green[i] = (1.0 + cos(z + r[2] * (frame + 200))) / 2 * 0xfff; |
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367 | } |
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368 | |
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369 | /* Set the palette */ |
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370 | cucul_set_dither_palette(dither, red, green, blue, alpha); |
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371 | |
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372 | do_plasma(screen, |
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373 | (1.0 + sin(((double)frame) * R[0])) / 2, |
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374 | (1.0 + sin(((double)frame) * R[1])) / 2, |
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375 | (1.0 + sin(((double)frame) * R[2])) / 2, |
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376 | (1.0 + sin(((double)frame) * R[3])) / 2, |
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377 | (1.0 + sin(((double)frame) * R[4])) / 2, |
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378 | (1.0 + sin(((double)frame) * R[5])) / 2); |
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379 | break; |
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380 | |
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381 | case RENDER: |
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382 | cucul_dither_bitmap(cv, 0, 0, |
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383 | cucul_get_canvas_width(cv), |
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384 | cucul_get_canvas_height(cv), |
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385 | dither, screen); |
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386 | break; |
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387 | |
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388 | case FREE: |
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389 | free(screen); |
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390 | cucul_free_dither(dither); |
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391 | break; |
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392 | } |
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393 | } |
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394 | |
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395 | static void do_plasma(uint8_t *pixels, double x_1, double y_1, |
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396 | double x_2, double y_2, double x_3, double y_3) |
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397 | { |
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398 | unsigned int X1 = x_1 * (TABLEX / 2), |
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399 | Y1 = y_1 * (TABLEY / 2), |
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400 | X2 = x_2 * (TABLEX / 2), |
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401 | Y2 = y_2 * (TABLEY / 2), |
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402 | X3 = x_3 * (TABLEX / 2), |
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403 | Y3 = y_3 * (TABLEY / 2); |
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404 | unsigned int y; |
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405 | uint8_t * t1 = table + X1 + Y1 * TABLEX, |
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406 | * t2 = table + X2 + Y2 * TABLEX, |
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407 | * t3 = table + X3 + Y3 * TABLEX; |
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408 | |
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409 | for(y = 0; y < YSIZ; y++) |
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410 | { |
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411 | unsigned int x; |
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412 | uint8_t * tmp = pixels + y * YSIZ; |
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413 | unsigned int ty = y * TABLEX, tmax = ty + XSIZ; |
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414 | for(x = 0; ty < tmax; ty++, tmp++) |
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415 | tmp[0] = t1[ty] + t2[ty] + t3[ty]; |
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416 | } |
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417 | } |
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418 | |
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419 | /* The metaball effect */ |
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420 | #define METASIZE (XSIZ/2) |
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421 | #define METABALLS 12 |
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422 | #define CROPBALL 200 /* Colour index where to crop balls */ |
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423 | static uint8_t metaball[METASIZE * METASIZE]; |
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424 | |
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425 | static void create_ball(void); |
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426 | static void draw_ball(uint8_t *, unsigned int, unsigned int); |
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427 | |
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428 | void metaballs(enum action action, cucul_canvas_t *cv) |
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429 | { |
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430 | static cucul_dither_t *cucul_dither; |
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431 | static uint8_t *screen; |
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432 | static unsigned int r[256], g[256], b[256], a[256]; |
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433 | static float dd[METABALLS], di[METABALLS], dj[METABALLS], dk[METABALLS]; |
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434 | static unsigned int x[METABALLS], y[METABALLS]; |
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435 | static float i = 10.0, j = 17.0, k = 11.0; |
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436 | static double offset[360 + 80]; |
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437 | static unsigned int angleoff; |
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438 | |
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439 | int n, angle; |
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440 | |
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441 | switch(action) |
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442 | { |
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443 | case PREPARE: |
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444 | /* Make the palette eatable by libcaca */ |
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445 | for(n = 0; n < 256; n++) |
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446 | r[n] = g[n] = b[n] = a[n] = 0x0; |
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447 | r[255] = g[255] = b[255] = 0xfff; |
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448 | |
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449 | /* Generate ball sprite */ |
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450 | create_ball(); |
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451 | |
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452 | for(n = 0; n < METABALLS; n++) |
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453 | { |
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454 | dd[n] = cucul_rand(0, 100); |
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455 | di[n] = (float)cucul_rand(500, 4000) / 6000.0; |
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456 | dj[n] = (float)cucul_rand(500, 4000) / 6000.0; |
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457 | dk[n] = (float)cucul_rand(500, 4000) / 6000.0; |
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458 | } |
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459 | |
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460 | angleoff = cucul_rand(0, 360); |
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461 | |
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462 | for(n = 0; n < 360 + 80; n++) |
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463 | offset[n] = 1.0 + sin((double)(n * M_PI / 60)); |
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464 | break; |
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465 | |
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466 | case INIT: |
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467 | screen = malloc(XSIZ * YSIZ * sizeof(uint8_t)); |
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468 | /* Create a libcucul dither smaller than our pixel buffer, so that we |
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469 | * display only the interesting part of it */ |
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470 | cucul_dither = cucul_create_dither(8, XSIZ - METASIZE, YSIZ - METASIZE, |
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471 | XSIZ, 0, 0, 0, 0); |
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472 | break; |
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473 | |
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474 | case UPDATE: |
---|
475 | angle = (frame + angleoff) % 360; |
---|
476 | |
---|
477 | /* Crop the palette */ |
---|
478 | for(n = CROPBALL; n < 255; n++) |
---|
479 | { |
---|
480 | int t1, t2, t3; |
---|
481 | double c1 = offset[angle]; |
---|
482 | double c2 = offset[angle + 40]; |
---|
483 | double c3 = offset[angle + 80]; |
---|
484 | |
---|
485 | t1 = n < 0x40 ? 0 : n < 0xc0 ? (n - 0x40) * 0x20 : 0xfff; |
---|
486 | t2 = n < 0xe0 ? 0 : (n - 0xe0) * 0x80; |
---|
487 | t3 = n < 0x40 ? n * 0x40 : 0xfff; |
---|
488 | |
---|
489 | r[n] = (c1 * t1 + c2 * t2 + c3 * t3) / 4; |
---|
490 | g[n] = (c1 * t2 + c2 * t3 + c3 * t1) / 4; |
---|
491 | b[n] = (c1 * t3 + c2 * t1 + c3 * t2) / 4; |
---|
492 | } |
---|
493 | |
---|
494 | /* Set the palette */ |
---|
495 | cucul_set_dither_palette(cucul_dither, r, g, b, a); |
---|
496 | |
---|
497 | /* Silly paths for our balls */ |
---|
498 | for(n = 0; n < METABALLS; n++) |
---|
499 | { |
---|
500 | float u = di[n] * i + dj[n] * j + dk[n] * sin(di[n] * k); |
---|
501 | float v = dd[n] + di[n] * j + dj[n] * k + dk[n] * sin(dk[n] * i); |
---|
502 | u = sin(i + u * 2.1) * (1.0 + sin(u)); |
---|
503 | v = sin(j + v * 1.9) * (1.0 + sin(v)); |
---|
504 | x[n] = (XSIZ - METASIZE) / 2 + u * (XSIZ - METASIZE) / 4; |
---|
505 | y[n] = (YSIZ - METASIZE) / 2 + v * (YSIZ - METASIZE) / 4; |
---|
506 | } |
---|
507 | |
---|
508 | i += 0.011; |
---|
509 | j += 0.017; |
---|
510 | k += 0.019; |
---|
511 | |
---|
512 | memset(screen, 0, XSIZ * YSIZ); |
---|
513 | |
---|
514 | for(n = 0; n < METABALLS; n++) |
---|
515 | draw_ball(screen, x[n], y[n]); |
---|
516 | break; |
---|
517 | |
---|
518 | case RENDER: |
---|
519 | cucul_dither_bitmap(cv, 0, 0, |
---|
520 | cucul_get_canvas_width(cv), |
---|
521 | cucul_get_canvas_height(cv), |
---|
522 | cucul_dither, screen + (METASIZE / 2) * (1 + XSIZ)); |
---|
523 | break; |
---|
524 | |
---|
525 | case FREE: |
---|
526 | free(screen); |
---|
527 | cucul_free_dither(cucul_dither); |
---|
528 | break; |
---|
529 | } |
---|
530 | } |
---|
531 | |
---|
532 | static void create_ball(void) |
---|
533 | { |
---|
534 | int x, y; |
---|
535 | float distance; |
---|
536 | |
---|
537 | for(y = 0; y < METASIZE; y++) |
---|
538 | for(x = 0; x < METASIZE; x++) |
---|
539 | { |
---|
540 | distance = ((METASIZE/2) - x) * ((METASIZE/2) - x) |
---|
541 | + ((METASIZE/2) - y) * ((METASIZE/2) - y); |
---|
542 | distance = sqrt(distance) * 64 / METASIZE; |
---|
543 | metaball[x + y * METASIZE] = distance > 15 ? 0 : (255 - distance) * 15; |
---|
544 | } |
---|
545 | } |
---|
546 | |
---|
547 | static void draw_ball(uint8_t *screen, unsigned int bx, unsigned int by) |
---|
548 | { |
---|
549 | unsigned int color; |
---|
550 | unsigned int i, e = 0; |
---|
551 | unsigned int b = (by * XSIZ) + bx; |
---|
552 | |
---|
553 | for(i = 0; i < METASIZE * METASIZE; i++) |
---|
554 | { |
---|
555 | color = screen[b] + metaball[i]; |
---|
556 | |
---|
557 | if(color > 255) |
---|
558 | color = 255; |
---|
559 | |
---|
560 | screen[b] = color; |
---|
561 | if(e == METASIZE) |
---|
562 | { |
---|
563 | e = 0; |
---|
564 | b += XSIZ - METASIZE; |
---|
565 | } |
---|
566 | b++; |
---|
567 | e++; |
---|
568 | } |
---|
569 | } |
---|
570 | |
---|
571 | /* The moiré effect */ |
---|
572 | #define DISCSIZ (XSIZ*2) |
---|
573 | #define DISCTHICKNESS (XSIZ*15/40) |
---|
574 | static uint8_t disc[DISCSIZ * DISCSIZ]; |
---|
575 | |
---|
576 | static void put_disc(uint8_t *, int, int); |
---|
577 | static void draw_line(int, int, char); |
---|
578 | |
---|
579 | void moire(enum action action, cucul_canvas_t *cv) |
---|
580 | { |
---|
581 | static cucul_dither_t *dither; |
---|
582 | static uint8_t *screen; |
---|
583 | static float d[6]; |
---|
584 | static unsigned int red[256], green[256], blue[256], alpha[256]; |
---|
585 | |
---|
586 | int i, x, y; |
---|
587 | |
---|
588 | switch(action) |
---|
589 | { |
---|
590 | case PREPARE: |
---|
591 | /* Fill various tables */ |
---|
592 | for(i = 0 ; i < 256; i++) |
---|
593 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
---|
594 | |
---|
595 | for(i = 0; i < 6; i++) |
---|
596 | d[i] = ((float)cucul_rand(50, 70)) / 1000.0; |
---|
597 | |
---|
598 | red[0] = green[0] = blue[0] = 0x777; |
---|
599 | red[1] = green[1] = blue[1] = 0xfff; |
---|
600 | |
---|
601 | /* Fill the circle */ |
---|
602 | for(i = DISCSIZ * 2; i > 0; i -= DISCTHICKNESS) |
---|
603 | { |
---|
604 | int t, dx, dy; |
---|
605 | |
---|
606 | for(t = 0, dx = 0, dy = i; dx <= dy; dx++) |
---|
607 | { |
---|
608 | draw_line(dx / 3, dy / 3, (i / DISCTHICKNESS) % 2); |
---|
609 | draw_line(dy / 3, dx / 3, (i / DISCTHICKNESS) % 2); |
---|
610 | |
---|
611 | t += t > 0 ? dx - dy-- : dx; |
---|
612 | } |
---|
613 | } |
---|
614 | |
---|
615 | break; |
---|
616 | |
---|
617 | case INIT: |
---|
618 | screen = malloc(XSIZ * YSIZ * sizeof(uint8_t)); |
---|
619 | dither = cucul_create_dither(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
---|
620 | break; |
---|
621 | |
---|
622 | case UPDATE: |
---|
623 | memset(screen, 0, XSIZ * YSIZ); |
---|
624 | |
---|
625 | /* Set the palette */ |
---|
626 | red[0] = 0.5 * (1 + sin(d[0] * (frame + 1000))) * 0xfff; |
---|
627 | green[0] = 0.5 * (1 + cos(d[1] * frame)) * 0xfff; |
---|
628 | blue[0] = 0.5 * (1 + cos(d[2] * (frame + 3000))) * 0xfff; |
---|
629 | |
---|
630 | red[1] = 0.5 * (1 + sin(d[3] * (frame + 2000))) * 0xfff; |
---|
631 | green[1] = 0.5 * (1 + cos(d[4] * frame + 5.0)) * 0xfff; |
---|
632 | blue[1] = 0.5 * (1 + cos(d[5] * (frame + 4000))) * 0xfff; |
---|
633 | |
---|
634 | cucul_set_dither_palette(dither, red, green, blue, alpha); |
---|
635 | |
---|
636 | /* Draw circles */ |
---|
637 | x = cos(d[0] * (frame + 1000)) * 128.0 + (XSIZ / 2); |
---|
638 | y = sin(0.11 * frame) * 128.0 + (YSIZ / 2); |
---|
639 | put_disc(screen, x, y); |
---|
640 | |
---|
641 | x = cos(0.13 * frame + 2.0) * 64.0 + (XSIZ / 2); |
---|
642 | y = sin(d[1] * (frame + 2000)) * 64.0 + (YSIZ / 2); |
---|
643 | put_disc(screen, x, y); |
---|
644 | break; |
---|
645 | |
---|
646 | case RENDER: |
---|
647 | cucul_dither_bitmap(cv, 0, 0, |
---|
648 | cucul_get_canvas_width(cv), |
---|
649 | cucul_get_canvas_height(cv), |
---|
650 | dither, screen); |
---|
651 | break; |
---|
652 | |
---|
653 | case FREE: |
---|
654 | free(screen); |
---|
655 | cucul_free_dither(dither); |
---|
656 | break; |
---|
657 | } |
---|
658 | } |
---|
659 | |
---|
660 | static void put_disc(uint8_t *screen, int x, int y) |
---|
661 | { |
---|
662 | char *src = ((char*)disc) + (DISCSIZ / 2 - x) + (DISCSIZ / 2 - y) * DISCSIZ; |
---|
663 | int i, j; |
---|
664 | |
---|
665 | for(j = 0; j < YSIZ; j++) |
---|
666 | for(i = 0; i < XSIZ; i++) |
---|
667 | { |
---|
668 | screen[i + XSIZ * j] ^= src[i + DISCSIZ * j]; |
---|
669 | } |
---|
670 | } |
---|
671 | |
---|
672 | static void draw_line(int x, int y, char color) |
---|
673 | { |
---|
674 | if(x == 0 || y == 0 || y > DISCSIZ / 2) |
---|
675 | return; |
---|
676 | |
---|
677 | if(x > DISCSIZ / 2) |
---|
678 | x = DISCSIZ / 2; |
---|
679 | |
---|
680 | memset(disc + (DISCSIZ / 2) - x + DISCSIZ * ((DISCSIZ / 2) - y), |
---|
681 | color, 2 * x - 1); |
---|
682 | memset(disc + (DISCSIZ / 2) - x + DISCSIZ * ((DISCSIZ / 2) + y - 1), |
---|
683 | color, 2 * x - 1); |
---|
684 | } |
---|
685 | |
---|
686 | /* Langton ant effect */ |
---|
687 | #define ANTS 15 |
---|
688 | #define ITER 2 |
---|
689 | |
---|
690 | void langton(enum action action, cucul_canvas_t *cv) |
---|
691 | { |
---|
692 | static char gradient[] = |
---|
693 | { |
---|
694 | ' ', ' ', '.', '.', ':', ':', 'x', 'x', |
---|
695 | 'X', 'X', '&', '&', 'W', 'W', '@', '@', |
---|
696 | }; |
---|
697 | static int steps[][2] = { { 0, 1 }, { 1, 0 }, { 0, -1 }, { -1, 0 } }; |
---|
698 | static uint8_t *screen; |
---|
699 | static int width, height; |
---|
700 | static int ax[ANTS], ay[ANTS], dir[ANTS]; |
---|
701 | |
---|
702 | int i, a, x, y; |
---|
703 | |
---|
704 | switch(action) |
---|
705 | { |
---|
706 | case PREPARE: |
---|
707 | width = cucul_get_canvas_width(cv); |
---|
708 | height = cucul_get_canvas_height(cv); |
---|
709 | for(i = 0; i < ANTS; i++) |
---|
710 | { |
---|
711 | ax[i] = cucul_rand(0, width); |
---|
712 | ay[i] = cucul_rand(0, height); |
---|
713 | dir[i] = cucul_rand(0, 4); |
---|
714 | } |
---|
715 | break; |
---|
716 | |
---|
717 | case INIT: |
---|
718 | screen = malloc(width * height); |
---|
719 | memset(screen, 0, width * height); |
---|
720 | break; |
---|
721 | |
---|
722 | case UPDATE: |
---|
723 | for(i = 0; i < ITER; i++) |
---|
724 | { |
---|
725 | for(x = 0; x < width * height; x++) |
---|
726 | { |
---|
727 | uint8_t p = screen[x]; |
---|
728 | if((p & 0x0f) > 1) |
---|
729 | screen[x] = p - 1; |
---|
730 | } |
---|
731 | |
---|
732 | for(a = 0; a < ANTS; a++) |
---|
733 | { |
---|
734 | uint8_t p = screen[ax[a] + width * ay[a]]; |
---|
735 | |
---|
736 | if(p & 0x0f) |
---|
737 | { |
---|
738 | dir[a] = (dir[a] + 1) % 4; |
---|
739 | screen[ax[a] + width * ay[a]] = a << 4; |
---|
740 | } |
---|
741 | else |
---|
742 | { |
---|
743 | dir[a] = (dir[a] + 3) % 4; |
---|
744 | screen[ax[a] + width * ay[a]] = (a << 4) | 0x0f; |
---|
745 | } |
---|
746 | ax[a] = (width + ax[a] + steps[dir[a]][0]) % width; |
---|
747 | ay[a] = (height + ay[a] + steps[dir[a]][1]) % height; |
---|
748 | } |
---|
749 | } |
---|
750 | break; |
---|
751 | |
---|
752 | case RENDER: |
---|
753 | for(y = 0; y < height; y++) |
---|
754 | { |
---|
755 | for(x = 0; x < width; x++) |
---|
756 | { |
---|
757 | uint8_t p = screen[x + width * y]; |
---|
758 | |
---|
759 | if(p & 0x0f) |
---|
760 | cucul_set_color_ansi(cv, CUCUL_WHITE, p >> 4); |
---|
761 | else |
---|
762 | cucul_set_color_ansi(cv, CUCUL_BLACK, CUCUL_BLACK); |
---|
763 | cucul_put_char(cv, x, y, gradient[p & 0x0f]); |
---|
764 | } |
---|
765 | } |
---|
766 | break; |
---|
767 | |
---|
768 | case FREE: |
---|
769 | free(screen); |
---|
770 | break; |
---|
771 | } |
---|
772 | } |
---|
773 | |
---|
774 | /* Matrix effect */ |
---|
775 | #define MAXDROPS 500 |
---|
776 | #define MINLEN 15 |
---|
777 | #define MAXLEN 30 |
---|
778 | |
---|
779 | void matrix(enum action action, cucul_canvas_t *cv) |
---|
780 | { |
---|
781 | static struct drop |
---|
782 | { |
---|
783 | int x, y, speed, len; |
---|
784 | char str[MAXLEN]; |
---|
785 | } |
---|
786 | drop[MAXDROPS]; |
---|
787 | |
---|
788 | int w, h, i, j; |
---|
789 | |
---|
790 | switch(action) |
---|
791 | { |
---|
792 | case PREPARE: |
---|
793 | for(i = 0; i < MAXDROPS; i++) |
---|
794 | { |
---|
795 | drop[i].x = cucul_rand(0, 1000); |
---|
796 | drop[i].y = cucul_rand(0, 1000); |
---|
797 | drop[i].speed = 5 + cucul_rand(0, 30); |
---|
798 | drop[i].len = MINLEN + cucul_rand(0, (MAXLEN - MINLEN)); |
---|
799 | for(j = 0; j < MAXLEN; j++) |
---|
800 | drop[i].str[j] = cucul_rand('0', 'z'); |
---|
801 | } |
---|
802 | break; |
---|
803 | |
---|
804 | case INIT: |
---|
805 | break; |
---|
806 | |
---|
807 | case UPDATE: |
---|
808 | w = cucul_get_canvas_width(cv); |
---|
809 | h = cucul_get_canvas_height(cv); |
---|
810 | |
---|
811 | for(i = 0; i < MAXDROPS && i < (w * h / 32); i++) |
---|
812 | { |
---|
813 | drop[i].y += drop[i].speed; |
---|
814 | if(drop[i].y > 1000) |
---|
815 | { |
---|
816 | drop[i].y -= 1000; |
---|
817 | drop[i].x = cucul_rand(0, 1000); |
---|
818 | } |
---|
819 | } |
---|
820 | break; |
---|
821 | |
---|
822 | case RENDER: |
---|
823 | w = cucul_get_canvas_width(cv); |
---|
824 | h = cucul_get_canvas_height(cv); |
---|
825 | |
---|
826 | cucul_set_color_ansi(cv, CUCUL_BLACK, CUCUL_BLACK); |
---|
827 | cucul_clear_canvas(cv); |
---|
828 | |
---|
829 | for(i = 0; i < MAXDROPS && i < (w * h / 32); i++) |
---|
830 | { |
---|
831 | int x, y; |
---|
832 | |
---|
833 | x = drop[i].x * w / 1000 / 2 * 2; |
---|
834 | y = drop[i].y * (h + MAXLEN) / 1000; |
---|
835 | |
---|
836 | for(j = 0; j < drop[i].len; j++) |
---|
837 | { |
---|
838 | unsigned int fg; |
---|
839 | |
---|
840 | if(j < 2) |
---|
841 | fg = CUCUL_WHITE; |
---|
842 | else if(j < drop[i].len / 4) |
---|
843 | fg = CUCUL_LIGHTGREEN; |
---|
844 | else if(j < drop[i].len * 4 / 5) |
---|
845 | fg = CUCUL_GREEN; |
---|
846 | else |
---|
847 | fg = CUCUL_DARKGRAY; |
---|
848 | cucul_set_color_ansi(cv, fg, CUCUL_BLACK); |
---|
849 | |
---|
850 | cucul_put_char(cv, x, y - j, |
---|
851 | drop[i].str[(y - j) % drop[i].len]); |
---|
852 | } |
---|
853 | } |
---|
854 | break; |
---|
855 | |
---|
856 | case FREE: |
---|
857 | break; |
---|
858 | } |
---|
859 | } |
---|
860 | |
---|
861 | /* Rotozoom effect */ |
---|
862 | #define TEXTURE_SIZE 256 |
---|
863 | #define TABLE_SIZE 65536 |
---|
864 | |
---|
865 | /* 24:8 Fixed point stuff */ |
---|
866 | #define PRECISION 8 |
---|
867 | |
---|
868 | #define FMUL(a, b) (((a)*(b))>>PRECISION) |
---|
869 | #define TOFIX(d) ((int)( (d)*(double)(1<<PRECISION) )) |
---|
870 | #define TOINT(a) (a>>PRECISION); |
---|
871 | |
---|
872 | #include "texture.h" |
---|
873 | |
---|
874 | void rotozoom(enum action action, cucul_canvas_t *canvas) |
---|
875 | { |
---|
876 | static uint32_t screen[XSIZ * YSIZ]; |
---|
877 | static int cos_tab[TABLE_SIZE], sin_tab[TABLE_SIZE]; |
---|
878 | static int y_tab[TEXTURE_SIZE]; |
---|
879 | |
---|
880 | static cucul_dither_t *dither; |
---|
881 | static uint32_t *texture; |
---|
882 | uint32_t *p; |
---|
883 | static int alphaF, tF; |
---|
884 | int scaleF; |
---|
885 | |
---|
886 | /* register is quite a bad idea on CISC, but not on RISC */ |
---|
887 | register unsigned int x, y; |
---|
888 | register unsigned int xxF, yyF, uF, vF, uF_, vF_; |
---|
889 | register unsigned int vu, vv; |
---|
890 | |
---|
891 | switch(action) |
---|
892 | { |
---|
893 | case PREPARE: |
---|
894 | for(x = 0; x < TABLE_SIZE; x++) |
---|
895 | { |
---|
896 | cos_tab[x] = TOFIX(cos(x * (360.0f / (float)TABLE_SIZE))); |
---|
897 | sin_tab[x] = TOFIX(sin(x * (360.0f / (float)TABLE_SIZE))); |
---|
898 | } |
---|
899 | for(x = 0; x < TEXTURE_SIZE; x++) |
---|
900 | y_tab[x] = x * TEXTURE_SIZE; /* start of lines offsets */ |
---|
901 | /* FIXME: this may be an invalid cast */ |
---|
902 | texture = (uint32_t *)textureByte; |
---|
903 | break; |
---|
904 | |
---|
905 | case INIT: |
---|
906 | dither = cucul_create_dither(32, XSIZ, YSIZ, XSIZ * 4, |
---|
907 | 0x00FF0000, |
---|
908 | 0x0000FF00, |
---|
909 | 0x000000FF, |
---|
910 | 0x00000000); |
---|
911 | break; |
---|
912 | |
---|
913 | case UPDATE: |
---|
914 | alphaF += 4; |
---|
915 | tF += 3; |
---|
916 | scaleF = FMUL(sin_tab[tF & 0xFFFF], TOFIX(3)) + (TOFIX(4)); |
---|
917 | xxF = FMUL(cos_tab[(alphaF) & 0xFFFF], scaleF); |
---|
918 | yyF = FMUL(sin_tab[(alphaF) & 0xFFFF], scaleF); |
---|
919 | uF = vF = 0; |
---|
920 | uF_ = vF_ = 0; |
---|
921 | p = screen; |
---|
922 | |
---|
923 | for(y = YSIZ; y--;) |
---|
924 | { |
---|
925 | for(x = XSIZ; x--;) |
---|
926 | { |
---|
927 | uF += xxF; |
---|
928 | vF += yyF; |
---|
929 | |
---|
930 | vu = TOINT(uF); |
---|
931 | vv = TOINT(vF); |
---|
932 | vu &= 0xFF; /* ARM doesn't like */ |
---|
933 | vv &= 0xFF; /* chars as local vars */ |
---|
934 | |
---|
935 | *p++ = texture[vu + y_tab[vv]]; |
---|
936 | } |
---|
937 | |
---|
938 | uF = uF_ -= yyF; |
---|
939 | vF = vF_ += xxF; |
---|
940 | } |
---|
941 | break; |
---|
942 | |
---|
943 | case RENDER: |
---|
944 | cucul_dither_bitmap(canvas, 0, 0, |
---|
945 | cucul_get_canvas_width(canvas), |
---|
946 | cucul_get_canvas_height(canvas), |
---|
947 | dither, screen); |
---|
948 | break; |
---|
949 | |
---|
950 | case FREE: |
---|
951 | cucul_free_dither(dither); |
---|
952 | break; |
---|
953 | } |
---|
954 | } |
---|
955 | |
---|