1 | /* |
---|
2 | * cacaball metaballs effect for libcaca |
---|
3 | * Copyright (c) 2003-2004 Jean-Yves Lamoureux <jylam@lnxscene.org> |
---|
4 | * All Rights Reserved |
---|
5 | * |
---|
6 | * $Id: cacaball.c 581 2006-03-10 09:48:33Z sam $ |
---|
7 | * |
---|
8 | * This program is free software; you can redistribute it and/or |
---|
9 | * modify it under the terms of the Do What The Fuck You Want To |
---|
10 | * Public License, Version 2, as published by Sam Hocevar. See |
---|
11 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
---|
12 | */ |
---|
13 | |
---|
14 | #include "config.h" |
---|
15 | |
---|
16 | #if !defined(__KERNEL__) |
---|
17 | # include <math.h> |
---|
18 | # ifndef M_PI |
---|
19 | # define M_PI 3.14159265358979323846 |
---|
20 | # endif |
---|
21 | #endif |
---|
22 | |
---|
23 | #include "cucul.h" |
---|
24 | #include "caca.h" |
---|
25 | |
---|
26 | /* Virtual buffer size */ |
---|
27 | #define XSIZ 256 |
---|
28 | #define YSIZ 256 |
---|
29 | |
---|
30 | #define METASIZE 100 |
---|
31 | #define METABALLS 16 |
---|
32 | |
---|
33 | /* Colour index where to crop balls */ |
---|
34 | #define CROPBALL 160 |
---|
35 | |
---|
36 | static void create_ball(void); |
---|
37 | static void draw_ball(unsigned int, unsigned int); |
---|
38 | |
---|
39 | static unsigned char pixels[XSIZ * YSIZ]; |
---|
40 | static unsigned char metaball[METASIZE * METASIZE]; |
---|
41 | |
---|
42 | int main(int argc, char **argv) |
---|
43 | { |
---|
44 | cucul_t *qq; caca_t *kk; |
---|
45 | unsigned int r[256], g[256], b[256], a[256]; |
---|
46 | float d[METABALLS], di[METABALLS], dj[METABALLS], dk[METABALLS]; |
---|
47 | unsigned int x[METABALLS], y[METABALLS]; |
---|
48 | struct cucul_bitmap *cucul_bitmap; |
---|
49 | float i = 10.0, j = 17.0, k = 11.0; |
---|
50 | int p, frame = 0, pause = 0; |
---|
51 | |
---|
52 | qq = cucul_init(); |
---|
53 | if(!qq) |
---|
54 | return 1; |
---|
55 | kk = caca_attach(qq); |
---|
56 | if(!kk) |
---|
57 | return 1; |
---|
58 | |
---|
59 | caca_set_delay(kk, 20000); |
---|
60 | |
---|
61 | /* Make the palette eatable by libcaca */ |
---|
62 | for(p = 0; p < 256; p++) |
---|
63 | r[p] = g[p] = b[p] = a[p] = 0x0; |
---|
64 | r[255] = g[255] = b[255] = 0xfff; |
---|
65 | |
---|
66 | /* Create a libcucul bitmap smaller than our pixel buffer, so that we |
---|
67 | * display only the interesting part of it */ |
---|
68 | cucul_bitmap = cucul_create_bitmap(qq, 8, XSIZ - METASIZE, YSIZ - METASIZE, |
---|
69 | XSIZ, 0, 0, 0, 0); |
---|
70 | |
---|
71 | /* Generate ball sprite */ |
---|
72 | create_ball(); |
---|
73 | |
---|
74 | for(p = 0; p < METABALLS; p++) |
---|
75 | { |
---|
76 | d[p] = cucul_rand(0, 100); |
---|
77 | di[p] = (float)cucul_rand(500, 4000) / 6000.0; |
---|
78 | dj[p] = (float)cucul_rand(500, 4000) / 6000.0; |
---|
79 | dk[p] = (float)cucul_rand(500, 4000) / 6000.0; |
---|
80 | } |
---|
81 | |
---|
82 | /* Go ! */ |
---|
83 | for(;;) |
---|
84 | { |
---|
85 | switch(caca_get_event(kk, CACA_EVENT_KEY_PRESS)) |
---|
86 | { |
---|
87 | case CACA_EVENT_KEY_PRESS | CACA_KEY_ESCAPE: goto end; |
---|
88 | case CACA_EVENT_KEY_PRESS | ' ': pause = !pause; |
---|
89 | } |
---|
90 | |
---|
91 | if(pause) |
---|
92 | goto paused; |
---|
93 | |
---|
94 | frame++; |
---|
95 | |
---|
96 | /* Crop the palette */ |
---|
97 | for(p = CROPBALL; p < 255; p++) |
---|
98 | { |
---|
99 | int t1, t2, t3; |
---|
100 | t1 = p < 0x40 ? 0 : p < 0xc0 ? (p - 0x40) * 0x20 : 0xfff; |
---|
101 | t2 = p < 0xe0 ? 0 : (p - 0xe0) * 0x80; |
---|
102 | t3 = p < 0x40 ? p * 0x40 : 0xfff; |
---|
103 | |
---|
104 | r[p] = (1.0 + sin((double)frame * M_PI / 60)) * t1 / 4 |
---|
105 | + (1.0 + sin((double)(frame + 40) * M_PI / 60)) * t2 / 4 |
---|
106 | + (1.0 + sin((double)(frame + 80) * M_PI / 60)) * t3 / 4; |
---|
107 | g[p] = (1.0 + sin((double)frame * M_PI / 60)) * t2 / 4 |
---|
108 | + (1.0 + sin((double)(frame + 40) * M_PI / 60)) * t3 / 4 |
---|
109 | + (1.0 + sin((double)(frame + 80) * M_PI / 60)) * t1 / 4; |
---|
110 | b[p] = (1.0 + sin((double)frame * M_PI / 60)) * t3 / 4 |
---|
111 | + (1.0 + sin((double)(frame + 40) * M_PI / 60)) * t1 / 4 |
---|
112 | + (1.0 + sin((double)(frame + 80) * M_PI / 60)) * t2 / 4; |
---|
113 | } |
---|
114 | |
---|
115 | /* Set the palette */ |
---|
116 | cucul_set_bitmap_palette(qq, cucul_bitmap, r, g, b, a); |
---|
117 | |
---|
118 | /* Silly paths for our balls */ |
---|
119 | for(p = 0; p < METABALLS; p++) |
---|
120 | { |
---|
121 | float u = di[p] * i + dj[p] * j + dk[p] * sin(di[p] * k); |
---|
122 | float v = d[p] + di[p] * j + dj[p] * k + dk[p] * sin(dk[p] * i); |
---|
123 | u = sin(i + u * 2.1) * (1.0 + sin(u)); |
---|
124 | v = sin(j + v * 1.9) * (1.0 + sin(v)); |
---|
125 | x[p] = (XSIZ - METASIZE) / 2 + u * (XSIZ - METASIZE) / 4; |
---|
126 | y[p] = (YSIZ - METASIZE) / 2 + v * (YSIZ - METASIZE) / 4; |
---|
127 | } |
---|
128 | |
---|
129 | i += 0.011; |
---|
130 | j += 0.017; |
---|
131 | k += 0.019; |
---|
132 | |
---|
133 | memset(pixels, 0, XSIZ * YSIZ); |
---|
134 | |
---|
135 | /* Here is all the trick. Maybe if you're that |
---|
136 | * clever you'll understand. */ |
---|
137 | for(p = 0; p < METABALLS; p++) |
---|
138 | draw_ball(x[p], y[p]); |
---|
139 | |
---|
140 | paused: |
---|
141 | /* Draw our virtual buffer to screen, letting libcucul resize it */ |
---|
142 | cucul_draw_bitmap(qq, 0, 0, |
---|
143 | cucul_get_width(qq) - 1, cucul_get_height(qq) - 1, |
---|
144 | cucul_bitmap, pixels + (METASIZE / 2) * (1 + XSIZ)); |
---|
145 | caca_display(kk); |
---|
146 | } |
---|
147 | |
---|
148 | /* End, bye folks */ |
---|
149 | end: |
---|
150 | cucul_free_bitmap(qq, cucul_bitmap); |
---|
151 | caca_detach(kk); |
---|
152 | cucul_end(qq); |
---|
153 | |
---|
154 | return 0; |
---|
155 | } |
---|
156 | |
---|
157 | /* Generate ball sprite |
---|
158 | * You should read the comments, I already wrote that before ... */ |
---|
159 | static void create_ball(void) |
---|
160 | { |
---|
161 | int x, y; |
---|
162 | float distance; |
---|
163 | |
---|
164 | for(y = 0; y < METASIZE; y++) |
---|
165 | for(x = 0; x < METASIZE; x++) |
---|
166 | { |
---|
167 | distance = ((METASIZE/2) - x) * ((METASIZE/2) - x) |
---|
168 | + ((METASIZE/2) - y) * ((METASIZE/2) - y); |
---|
169 | distance = sqrt(distance) * 64 / METASIZE; |
---|
170 | metaball[x + y * METASIZE] = distance > 15 ? 0 : (255 - distance) * 15; |
---|
171 | } |
---|
172 | } |
---|
173 | |
---|
174 | /* You missed the trick ? */ |
---|
175 | static void draw_ball(unsigned int bx, unsigned int by) |
---|
176 | { |
---|
177 | unsigned int color; |
---|
178 | unsigned int i, e = 0; |
---|
179 | unsigned int b = (by * XSIZ) + bx; |
---|
180 | |
---|
181 | for(i = 0; i < METASIZE * METASIZE; i++) |
---|
182 | { |
---|
183 | color = pixels[b] + metaball[i]; |
---|
184 | |
---|
185 | if(color > 255) |
---|
186 | color = 255; |
---|
187 | |
---|
188 | pixels[b] = color; |
---|
189 | if(e == METASIZE) |
---|
190 | { |
---|
191 | e = 0; |
---|
192 | b += XSIZ - METASIZE; |
---|
193 | } |
---|
194 | b++; |
---|
195 | e++; |
---|
196 | } |
---|
197 | } |
---|
198 | |
---|