moved tinygl

graphics/tinygl/specbuf.cpp

@@ -0,0 +1,46 @@
+
+#include "engine/tinygl/zgl.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) {
+		found->last_used = c->specbuf_used_counter++;
+		return found;
+	}
+	if (!oldest || c->specbuf_num_buffers < MAX_SPECULAR_BUFFERS) {
+		// create new buffer
+		GLSpecBuf *buf = (GLSpecBuf *)gl_malloc(sizeof(GLSpecBuf));
+		if (!buf)
+			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
+	oldest->shininess_i = shininess_i;
+	oldest->last_used = c->specbuf_used_counter++;
+	calc_buf(oldest, shininess);
+	return oldest;
+}