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#include "zgl.h"
#include "msghandling.h"
#include <math.h>
#include <stdlib.h>
static void calc_buf(GLSpecBuf *buf, const float shininess)
{
int i;
float val, inc;
val = 0.0f;
inc = 1.0f/SPECULAR_BUFFER_SIZE;
for (i = 0; i <= SPECULAR_BUFFER_SIZE; i++) {
buf->buf[i] = pow(val, shininess);
val += inc;
}
}
GLSpecBuf *
specbuf_get_buffer(GLContext *c, const int shininess_i,
const float shininess)
{
GLSpecBuf *found, *oldest;
found = oldest = c->specbuf_first;
while (found && found->shininess_i != shininess_i) {
if (found->last_used < oldest->last_used) {
oldest = found;
}
found = found->next;
}
if (found) { /* hey, found one! */
found->last_used = c->specbuf_used_counter++;
return found;
}
if (oldest == NULL || c->specbuf_num_buffers < MAX_SPECULAR_BUFFERS) {
/* create new buffer */
GLSpecBuf *buf = gl_malloc(sizeof(GLSpecBuf));
if (!buf) gl_fatal_error("could not allocate specular buffer");
c->specbuf_num_buffers++;
buf->next = c->specbuf_first;
c->specbuf_first = buf;
buf->last_used = c->specbuf_used_counter++;
buf->shininess_i = shininess_i;
calc_buf(buf, shininess);
return buf;
}
/* overwrite the lru buffer */
/*tgl_trace("overwriting spec buffer :(\n");*/
oldest->shininess_i = shininess_i;
oldest->last_used = c->specbuf_used_counter++;
calc_buf(oldest, shininess);
return oldest;
}
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