source: trunk/sys/TinyGL/src/specbuf.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

First import

File size: 1.4 KB
Line 
1#include "zgl.h"
2#include "msghandling.h"
3#include <math.h>
4#include <stdlib.h>
5
6static void calc_buf(GLSpecBuf *buf, const float shininess)
7{
8  int i;
9  float val, inc;
10  val = 0.0f;
11  inc = 1.0f/SPECULAR_BUFFER_SIZE;
12  for (i = 0; i <= SPECULAR_BUFFER_SIZE; i++) {
13    buf->buf[i] = pow(val, shininess);
14    val += inc;
15  }
16}
17
18GLSpecBuf *
19specbuf_get_buffer(GLContext *c, const int shininess_i, 
20                   const float shininess)
21{
22  GLSpecBuf *found, *oldest;
23  found = oldest = c->specbuf_first;
24  while (found && found->shininess_i != shininess_i) {
25    if (found->last_used < oldest->last_used) {
26      oldest = found;
27    }
28    found = found->next; 
29  }
30  if (found) { /* hey, found one! */
31    found->last_used = c->specbuf_used_counter++;
32    return found;
33  }
34  if (oldest == NULL || c->specbuf_num_buffers < MAX_SPECULAR_BUFFERS) {
35    /* create new buffer */
36    GLSpecBuf *buf = gl_malloc(sizeof(GLSpecBuf));
37    if (!buf) gl_fatal_error("could not allocate specular buffer");
38    c->specbuf_num_buffers++;
39    buf->next = c->specbuf_first;
40    c->specbuf_first = buf;
41    buf->last_used = c->specbuf_used_counter++;
42    buf->shininess_i = shininess_i;
43    calc_buf(buf, shininess);
44    return buf;     
45  }
46  /* overwrite the lru buffer */
47  /*tgl_trace("overwriting spec buffer :(\n");*/
48  oldest->shininess_i = shininess_i;
49  oldest->last_used = c->specbuf_used_counter++;
50  calc_buf(oldest, shininess);
51  return oldest;
52}
Note: See TracBrowser for help on using the repository browser.