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87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
/* ResidualVM - A 3D game interpreter
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*
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* ResidualVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the AUTHORS
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/*
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* This file is based on, or a modified version of code from TinyGL (C) 1997-1998 Fabrice Bellard,
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* which is licensed under the zlib-license (see LICENSE).
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* It also has modifications by the ResidualVM-team, which are covered under the GPLv2 (or later).
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*/
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#include "graphics/tinygl/zgl.h"
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namespace TinyGL {
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static void calc_buf(GLSpecBuf *buf, const float shininess) {
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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 (int 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 *specbuf_get_buffer(GLContext *c, const int shininess_i, const float shininess) {
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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) {
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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 || c->specbuf_num_buffers < MAX_SPECULAR_BUFFERS) {
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// create new buffer
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GLSpecBuf *buf = (GLSpecBuf *)gl_malloc(sizeof(GLSpecBuf));
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if (!buf)
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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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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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void specbuf_cleanup(GLContext *c) {
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GLSpecBuf *buf, *next;
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buf = c->specbuf_first;
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for (int i = 0; i < c->specbuf_num_buffers; ++i) {
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next = buf->next;
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gl_free(buf);
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buf = next;
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}
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}
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} // end of namespace TinyGL
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