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