120 lines
5.3 KiB
C++
120 lines
5.3 KiB
C++
/**************************************************************************/
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/* vertex_cache_optimizer.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef VERTEX_CACHE_OPTIMIZER_H
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#define VERTEX_CACHE_OPTIMIZER_H
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// This class is derived from
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// https://www.martin.st/thesis/
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// Based on Tom Forsyth's vertex cache optimizer
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/*
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Copyright (C) 2008 Martin Storsjo
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "core/local_vector.h"
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#include "core/math/math_defs.h"
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#include <stdint.h>
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class VertexCacheOptimizer {
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typedef uint32_t VERTEX_INDEX_TYPE;
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// The size of these data types affect the memory usage.
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typedef uint16_t SCORE_TYPE;
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typedef uint8_t ADJACENCY_TYPE;
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typedef int8_t CACHE_POS_TYPE;
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typedef int32_t TRIANGLE_INDEX_TYPE;
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typedef int32_t ARRAY_INDEX_TYPE;
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struct Constants {
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// The size of the precalculated tables.
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static const int CACHE_SCORE_TABLE_SIZE = 32;
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static const int VALENCE_SCORE_TABLE_SIZE = 32;
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static const int MAX_ADJACENCY = UINT8_MAX;
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static const int SCORE_SCALING = 7281;
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// Score function constants.
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static constexpr float CACHE_DECAY_POWER = 1.5;
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static constexpr float LAST_TRI_SCORE = 0.75;
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static constexpr float VALENCE_BOOST_SCALE = 2.0;
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static constexpr float VALENCE_BOOST_POWER = 0.5;
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// Set these to adjust the performance and result quality.
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static const int VERTEX_CACHE_SIZE = 24;
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static const int CACHE_FUNCTION_LENGTH = 32;
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static_assert(CACHE_SCORE_TABLE_SIZE >= VERTEX_CACHE_SIZE, "Vertex score table too small");
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};
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// Precalculated tables.
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SCORE_TYPE _cache_position_score[Constants::CACHE_SCORE_TABLE_SIZE];
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SCORE_TYPE _valence_score[Constants::VALENCE_SCORE_TABLE_SIZE];
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int is_added(const uint8_t *p_triangle_added, int p_x) const {
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return p_triangle_added[(p_x) >> 3] & (1 << (p_x & 7));
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}
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void set_added(uint8_t *p_triangle_added, int p_x) const {
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p_triangle_added[(p_x) >> 3] |= (1 << (p_x & 7));
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}
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// Precalculate the tables.
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void init();
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// Calculate the score for a vertex.
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SCORE_TYPE find_vertex_score(int p_num_active_tris, int p_cache_position);
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// The main reordering function.
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VERTEX_INDEX_TYPE *_reorder_indices(VERTEX_INDEX_TYPE *r_dest_indices, const VERTEX_INDEX_TYPE *p_source_indices, int p_num_triangles, int p_num_vertices);
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public:
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VertexCacheOptimizer() {
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init();
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}
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bool reorder_indices(LocalVector<int> &r_indices, uint32_t p_num_triangles, uint32_t p_num_verts);
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bool reorder_indices_pool(PoolVector<int> &r_indices, uint32_t p_num_triangles, uint32_t p_num_verts);
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};
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#endif // VERTEX_CACHE_OPTIMIZER_H
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