mirror of
https://github.com/kiedtl/fire.git
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108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "args.h"
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#include "termbox.h"
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#include "draw.h"
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#include "colors.h"
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#include "output.h"
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#ifdef __OpenBSD__
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#include "sys/types.h"
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#else
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#include "stdint.h"
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#endif
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#define MAX(VAL1, VAL2) ((VAL1) > (VAL2) ? (VAL1) : (VAL2))
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#define MIN(VAL1, VAL2) ((VAL1) < (VAL2) ? (VAL1) : (VAL2))
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// arguments
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extern struct Options *opts;
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// initialize the framebuffer
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void
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init(struct buffer *buf)
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{
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// initialize width/height of terminal
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buf->width = tb_width();
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buf->height = tb_height();
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size_t len = buf->width * buf->height;
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buf->buf = (uint8_t*) calloc(len, sizeof(uint8_t));
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len -= buf->width;
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if (buf->buf == NULL) {
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EPRINT("fire: cannot ");
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perror("calloc()");
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exit(1);
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}
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// calloc sets the entire screen to black
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// ...except for the last row, which is white.
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// this is the 'base' of the fire.
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memset(buf->buf + len, opts->truecolor ? 34 : 12, buf->width);
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}
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// update the framebuffer
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void
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dofire(struct buffer *buf)
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{
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size_t src;
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size_t random = (rand() % 7) & 3;
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size_t dest;
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struct tb_cell *realbuf = tb_cell_buffer();
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for (size_t x = 0; x < buf->width; ++x) {
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for (size_t y = 1; y < buf->height; ++y) {
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if ((rand() % opts->random_factor) == 0) {
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random = (rand() % 7) & 3;
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}
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src = y * buf->width + x;
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if (opts->random_wind) {
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dest = src - random + opts->wind;
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} else {
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dest = src + opts->wind;
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}
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size_t max_value;
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struct tb_cell *colors;
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if (opts->truecolor == TRUE) {
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colors = (struct tb_cell*) &truecolors;
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max_value = 35;
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} else {
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colors = (struct tb_cell*) &normcolors;
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max_value = 12;
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}
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if (buf->width > dest) {
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dest = 0;
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} else {
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dest -= buf->width;
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}
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size_t loss = MIN(opts->max_heat_loss, 3);
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buf->buf[dest] = MAX(buf->buf[src] - (random & loss), 0);
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if (buf->buf[dest] > max_value) {
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buf->buf[dest] = 0;
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}
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realbuf[dest] = colors[buf->buf[dest]];
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realbuf[src] = colors[buf->buf[src]];
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}
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}
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}
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// free framebuffer and shutdown termbox
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void
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cleanup(struct buffer *buf)
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{
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free(buf->buf);
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tb_shutdown();
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}
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