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