1 | // Copyright (C) 2012-2017 ChaosForge Ltd
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2 | // http://chaosforge.org/
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3 | //
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4 | // This file is part of Nova libraries.
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5 | // For conditions of distribution and use, see copying.txt file in root folder.
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6 |
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7 | #include "nv/gfx/texture_atlas.hh"
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8 |
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9 | #include "nv/core/logging.hh"
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10 |
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11 | using namespace nv;
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12 |
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13 | texture_atlas::texture_atlas( ivec2 size, uint32 depth, uint32 border /*= 1*/ )
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14 | : image( size, depth ), m_used( 0 ), m_border( border )
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15 | {
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16 | m_nodes.push_back( ivec3( m_border, m_border, m_size.x - 2 * static_cast<int>( m_border ) ) );
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17 | fill( 0 );
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18 | }
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19 |
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20 | region texture_atlas::get_region( ivec2 size )
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21 | {
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22 | region r ( ivec2(0,0), size );
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23 |
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24 | int best_height = nv::limits::si_max;
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25 | int best_index = -1;
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26 | int best_width = nv::limits::si_max;
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27 |
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28 | for( uint32 i=0; i < m_nodes.size(); ++i )
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29 | {
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30 | int y = fit( i, size );
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31 | if ( y >= 0 )
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32 | {
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33 | ivec3 node = m_nodes[ i ];
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34 | if ( ( (y + size.y) < best_height ) ||
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35 | ( ((y + size.y) == best_height) && (node.z < best_width)) )
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36 | {
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37 | best_height = y + size.y;
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38 | best_index = static_cast<int>( i );
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39 | best_width = node.z;
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40 | r.pos.x = node.x;
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41 | r.pos.y = y;
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42 | }
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43 | }
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44 | }
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45 |
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46 | if ( best_index == -1 )
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47 | {
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48 | return region( ivec2( -1, -1 ), ivec2( 0, 0 ) );
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49 | }
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50 |
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51 | m_nodes.insert( m_nodes.begin() + best_index, ivec3( r.pos.x, r.pos.y + size.y, size.x ) );
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52 |
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53 | for( uint32 i = static_cast<uint32>( best_index )+1; i < m_nodes.size(); ++i )
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54 | {
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55 | ivec3 node = m_nodes[ i ];
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56 | ivec3 prev = m_nodes[ i-1 ];
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57 |
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58 | if ( node.x < prev.x + prev.z )
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59 | {
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60 | int shrink = prev.x + prev.z - node.x;
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61 | m_nodes[ i ].x += shrink;
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62 | m_nodes[ i ].z -= shrink;
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63 |
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64 | if ( m_nodes[ i ].z <= 0 )
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65 | {
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66 | m_nodes.erase( m_nodes.begin() + static_cast<int>(i) );
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67 | --i;
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68 | }
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69 | else
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70 | {
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71 | break;
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72 | }
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73 | }
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74 | else
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75 | {
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76 | break;
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77 | }
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78 | }
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79 | merge();
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80 | m_used += static_cast<uint32>(size.x * size.y);
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81 | return r;
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82 | }
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83 |
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84 | int texture_atlas::fit( uint32 index, ivec2 size )
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85 | {
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86 | ivec3 node = m_nodes[ index ];
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87 |
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88 | if ( node.x + size.x > m_size.x - static_cast<int>( m_border ) )
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89 | {
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90 | return -1;
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91 | }
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92 |
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93 | int y = node.y;
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94 | int wleft = size.x;
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95 |
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96 | while ( wleft > 0 )
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97 | {
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98 | node = m_nodes[ index ];
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99 | if ( node.y > y )
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100 | {
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101 | y = node.y;
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102 | }
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103 | if ( y + size.y > m_size.y - static_cast<int>( m_border ) )
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104 | {
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105 | return -1;
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106 | }
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107 | wleft -= node.z;
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108 | ++index;
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109 | }
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110 | return y;
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111 | }
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112 |
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113 | void texture_atlas::merge()
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114 | {
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115 | for ( uint32 i=0; i < m_nodes.size()-1; ++i )
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116 | {
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117 | if ( m_nodes[ i ].y == m_nodes[ i+1 ].y )
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118 | {
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119 | m_nodes[ i ].z += m_nodes[ i+1 ].z;
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120 | m_nodes.erase( m_nodes.begin()+static_cast<int>(i+1) );
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121 | --i;
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122 | }
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123 | }
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124 | }
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125 |
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126 | void texture_atlas::clear()
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127 | {
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128 | m_nodes.clear();
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129 | m_used = 0;
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130 | m_nodes.push_back( ivec3( 1, 1, m_size.x - 2 ) );
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131 | fill( 0 );
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132 | }
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