| [11] | 1 | // Copyright (C) 2012-2013 ChaosForge / Kornel Kisielewicz
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| 2 | // http://chaosforge.org/
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| 3 | //
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| 4 | // This file is part of NV Libraries.
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| 5 | // For conditions of distribution and use, see copyright notice in nv.hh
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| 6 |
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| [89] | 7 | #include "nv/gfx/texture_atlas.hh"
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| [11] | 8 |
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| [13] | 9 | #include "nv/logging.hh"
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| [28] | 10 | #include <iostream>
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| [13] | 11 |
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| [11] | 12 | using namespace nv;
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| 13 |
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| [142] | 14 | texture_atlas::texture_atlas( glm::ivec2 size, size_t depth, size_t border /*= 1*/ )
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| [145] | 15 | : image( size, depth ), m_used( 0 ), m_border( border )
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| [11] | 16 | {
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| [145] | 17 | m_nodes.push_back( glm::ivec3( m_border, m_border, m_size.x - 2 * m_border ) );
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| [11] | 18 | fill( 0 );
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| 19 | }
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| 20 |
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| [13] | 21 | region texture_atlas::get_region( glm::ivec2 size )
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| [11] | 22 | {
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| [13] | 23 | region r ( glm::ivec2(0,0), size );
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| [11] | 24 |
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| [27] | 25 | int best_height = INT_MAX;
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| 26 | int best_index = -1;
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| 27 | int best_width = INT_MAX;
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| [29] | 28 |
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| [11] | 29 | for( size_t i=0; i < m_nodes.size(); ++i )
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| 30 | {
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| [27] | 31 | int y = fit( i, size );
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| [145] | 32 | if ( y >= 0 )
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| [11] | 33 | {
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| [27] | 34 | glm::ivec3 node = m_nodes[ i ];
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| [11] | 35 | if ( ( (y + size.y) < best_height ) ||
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| [27] | 36 | ( ((y + size.y) == best_height) && (node.z < best_width)) )
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| [11] | 37 | {
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| 38 | best_height = y + size.y;
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| [121] | 39 | best_index = static_cast<int>( i );
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| [11] | 40 | best_width = node.z;
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| [13] | 41 | r.pos.x = node.x;
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| 42 | r.pos.y = y;
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| [11] | 43 | }
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| [27] | 44 | }
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| 45 | }
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| [11] | 46 |
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| [27] | 47 | if ( best_index == -1 )
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| 48 | {
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| 49 | return region( glm::ivec2( -1, -1 ), glm::ivec2( 0, 0 ) );
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| 50 | }
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| [11] | 51 |
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| [27] | 52 | m_nodes.insert( m_nodes.begin() + best_index, glm::ivec3( r.pos.x, r.pos.y + size.y, size.x ) );
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| [11] | 53 |
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| [121] | 54 | for( size_t i = static_cast<size_t>( best_index )+1; i < m_nodes.size(); ++i )
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| [27] | 55 | {
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| 56 | glm::ivec3 node = m_nodes[ i ];
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| 57 | glm::ivec3 prev = m_nodes[ i-1 ];
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| [11] | 58 |
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| [145] | 59 | if ( node.x < prev.x + prev.z )
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| [27] | 60 | {
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| 61 | int shrink = prev.x + prev.z - node.x;
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| [11] | 62 | m_nodes[ i ].x += shrink;
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| 63 | m_nodes[ i ].z -= shrink;
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| 64 |
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| [145] | 65 | if ( m_nodes[ i ].z <= 0 )
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| [27] | 66 | {
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| [121] | 67 | m_nodes.erase( m_nodes.begin() + static_cast<int>(i) );
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| [27] | 68 | --i;
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| 69 | }
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| 70 | else
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| 71 | {
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| 72 | break;
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| 73 | }
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| 74 | }
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| 75 | else
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| 76 | {
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| 77 | break;
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| 78 | }
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| 79 | }
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| 80 | merge();
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| [142] | 81 | m_used += static_cast<uint32>(size.x * size.y);
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| [27] | 82 | return r;
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| [11] | 83 | }
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| 84 |
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| 85 | int texture_atlas::fit( size_t index, glm::ivec2 size )
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| 86 | {
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| 87 | glm::ivec3 node = m_nodes[ index ];
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| 88 |
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| [145] | 89 | if ( node.x + size.x > m_size.x - m_border )
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| [11] | 90 | {
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| 91 | return -1;
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| 92 | }
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| 93 |
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| 94 | int y = node.y;
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| 95 | int wleft = size.x;
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| 96 |
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| [145] | 97 | while ( wleft > 0 )
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| [11] | 98 | {
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| [27] | 99 | node = m_nodes[ index ];
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| [145] | 100 | if ( node.y > y )
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| [27] | 101 | {
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| 102 | y = node.y;
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| 103 | }
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| [145] | 104 | if ( y + size.y > m_size.y - m_border )
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| [27] | 105 | {
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| [11] | 106 | return -1;
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| [27] | 107 | }
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| [11] | 108 | wleft -= node.z;
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| [27] | 109 | ++index;
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| [11] | 110 | }
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| 111 | return y;
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| 112 | }
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| 113 |
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| 114 | void texture_atlas::merge()
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| 115 | {
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| [145] | 116 | for ( size_t i=0; i < m_nodes.size()-1; ++i )
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| [11] | 117 | {
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| [145] | 118 | if ( m_nodes[ i ].y == m_nodes[ i+1 ].y )
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| [11] | 119 | {
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| 120 | m_nodes[ i ].z += m_nodes[ i+1 ].z;
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| [121] | 121 | m_nodes.erase( m_nodes.begin()+static_cast<int>(i+1) );
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| [11] | 122 | --i;
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| 123 | }
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| 124 | }
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| 125 | }
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| 126 |
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| 127 | void texture_atlas::clear()
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| 128 | {
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| 129 | m_nodes.clear();
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| 130 | m_used = 0;
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| 131 | m_nodes.push_back( glm::ivec3( 1, 1, m_size.x - 2 ) );
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| 132 | fill( 0 );
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| 133 | }
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