1 files changed, 52 insertions, 0 deletions
diff --git a/3rdparty/tinygl-0.4-ugfx/src/specbuf.c b/3rdparty/tinygl-0.4-ugfx/src/specbuf.c
new file mode 100644
index 00000000..7cbfb057
--- /dev/null
+++ b/3rdparty/tinygl-0.4-ugfx/src/specbuf.c
@@ -0,0 +1,52 @@
+#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;
+}