mirror of
https://github.com/scratchfoundation/bgfx.git
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537 lines
14 KiB
C++
537 lines
14 KiB
C++
/*
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* Copyright 2013 Jeremie Roy. All rights reserved.
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* License: http://www.opensource.org/licenses/BSD-2-Clause
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*/
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#include "common.h"
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#include <bgfx/bgfx.h>
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#include <limits.h> // INT_MAX
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#include <memory.h> // memset
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#include <vector>
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#include "cube_atlas.h"
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class RectanglePacker
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{
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public:
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RectanglePacker();
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RectanglePacker(uint32_t _width, uint32_t _height);
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/// non constructor initialization
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void init(uint32_t _width, uint32_t _height);
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/// find a suitable position for the given rectangle
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/// @return true if the rectangle can be added, false otherwise
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bool addRectangle(uint16_t _width, uint16_t _height, uint16_t& _outX, uint16_t& _outY);
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/// return the used surface in squared unit
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uint32_t getUsedSurface()
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{
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return m_usedSpace;
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}
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/// return the total available surface in squared unit
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uint32_t getTotalSurface()
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{
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return m_width * m_height;
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}
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/// return the usage ratio of the available surface [0:1]
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float getUsageRatio();
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/// reset to initial state
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void clear();
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private:
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int32_t fit(uint32_t _skylineNodeIndex, uint16_t _width, uint16_t _height);
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/// Merges all skyline nodes that are at the same level.
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void merge();
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struct Node
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{
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Node(int16_t _x, int16_t _y, int16_t _width) : x(_x), y(_y), width(_width)
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{
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}
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int16_t x; //< The starting x-coordinate (leftmost).
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int16_t y; //< The y-coordinate of the skyline level line.
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int32_t width; //< The line _width. The ending coordinate (inclusive) will be x+width-1.
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};
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uint32_t m_width; //< width (in pixels) of the underlying texture
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uint32_t m_height; //< height (in pixels) of the underlying texture
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uint32_t m_usedSpace; //< Surface used in squared pixel
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std::vector<Node> m_skyline; //< node of the skyline algorithm
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};
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RectanglePacker::RectanglePacker()
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: m_width(0)
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, m_height(0)
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, m_usedSpace(0)
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{
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}
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RectanglePacker::RectanglePacker(uint32_t _width, uint32_t _height)
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: m_width(_width)
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, m_height(_height)
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, m_usedSpace(0)
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{
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// We want a one pixel border around the whole atlas to avoid any artefact when
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// sampling texture
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m_skyline.push_back(Node(1, 1, _width - 2) );
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}
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void RectanglePacker::init(uint32_t _width, uint32_t _height)
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{
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BX_CHECK(_width > 2, "_width must be > 2");
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BX_CHECK(_height > 2, "_height must be > 2");
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m_width = _width;
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m_height = _height;
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m_usedSpace = 0;
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m_skyline.clear();
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// We want a one pixel border around the whole atlas to avoid any artifact when
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// sampling texture
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m_skyline.push_back(Node(1, 1, _width - 2) );
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}
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bool RectanglePacker::addRectangle(uint16_t _width, uint16_t _height, uint16_t& _outX, uint16_t& _outY)
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{
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int yy, best_height, best_index;
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int32_t best_width;
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Node* node;
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Node* prev;
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_outX = 0;
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_outY = 0;
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uint32_t ii;
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best_height = INT_MAX;
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best_index = -1;
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best_width = INT_MAX;
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for (ii = 0; ii < m_skyline.size(); ++ii)
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{
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yy = fit(ii, _width, _height);
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if (yy >= 0)
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{
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node = &m_skyline[ii];
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if ( ( (yy + _height) < best_height)
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|| ( ( (yy + _height) == best_height)
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&& (node->width < best_width) ) )
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{
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best_height = yy + _height;
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best_index = ii;
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best_width = node->width;
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_outX = node->x;
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_outY = yy;
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}
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}
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}
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if (best_index == -1)
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{
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return false;
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}
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Node newNode(_outX, _outY + _height, _width);
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m_skyline.insert(m_skyline.begin() + best_index, newNode);
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for (ii = best_index + 1; ii < m_skyline.size(); ++ii)
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{
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node = &m_skyline[ii];
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prev = &m_skyline[ii - 1];
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if (node->x < (prev->x + prev->width) )
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{
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int shrink = prev->x + prev->width - node->x;
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node->x += shrink;
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node->width -= shrink;
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if (node->width <= 0)
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{
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m_skyline.erase(m_skyline.begin() + ii);
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--ii;
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}
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else
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{
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break;
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}
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}
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else
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{
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break;
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}
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}
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merge();
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m_usedSpace += _width * _height;
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return true;
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}
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float RectanglePacker::getUsageRatio()
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{
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uint32_t total = m_width * m_height;
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if (total > 0)
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{
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return (float)m_usedSpace / (float)total;
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}
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return 0.0f;
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}
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void RectanglePacker::clear()
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{
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m_skyline.clear();
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m_usedSpace = 0;
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// We want a one pixel border around the whole atlas to avoid any artefact when
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// sampling texture
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m_skyline.push_back(Node(1, 1, m_width - 2) );
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}
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int32_t RectanglePacker::fit(uint32_t _skylineNodeIndex, uint16_t _width, uint16_t _height)
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{
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int32_t width = _width;
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int32_t height = _height;
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const Node& baseNode = m_skyline[_skylineNodeIndex];
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int32_t xx = baseNode.x, yy;
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int32_t widthLeft = width;
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int32_t ii = _skylineNodeIndex;
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if ( (xx + width) > (int32_t)(m_width - 1) )
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{
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return -1;
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}
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yy = baseNode.y;
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while (widthLeft > 0)
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{
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const Node& node = m_skyline[ii];
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if (node.y > yy)
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{
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yy = node.y;
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}
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if ( (yy + height) > (int32_t)(m_height - 1) )
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{
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return -1;
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}
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widthLeft -= node.width;
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++ii;
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}
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return yy;
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}
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void RectanglePacker::merge()
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{
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Node* node;
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Node* next;
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uint32_t ii;
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for (ii = 0; ii < m_skyline.size() - 1; ++ii)
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{
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node = (Node*) &m_skyline[ii];
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next = (Node*) &m_skyline[ii + 1];
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if (node->y == next->y)
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{
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node->width += next->width;
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m_skyline.erase(m_skyline.begin() + ii + 1);
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--ii;
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}
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}
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}
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struct Atlas::PackedLayer
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{
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RectanglePacker packer;
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AtlasRegion faceRegion;
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};
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Atlas::Atlas(uint16_t _textureSize, uint16_t _maxRegionsCount)
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: m_usedLayers(0)
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, m_usedFaces(0)
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, m_textureSize(_textureSize)
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, m_regionCount(0)
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, m_maxRegionCount(_maxRegionsCount)
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{
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BX_CHECK(_textureSize >= 64 && _textureSize <= 4096, "Invalid _textureSize %d.", _textureSize);
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BX_CHECK(_maxRegionsCount >= 64 && _maxRegionsCount <= 32000, "Invalid _maxRegionsCount %d.", _maxRegionsCount);
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init();
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m_layers = new PackedLayer[24];
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for (int ii = 0; ii < 24; ++ii)
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{
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m_layers[ii].packer.init(_textureSize, _textureSize);
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}
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m_regions = new AtlasRegion[_maxRegionsCount];
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m_textureBuffer = new uint8_t[ _textureSize * _textureSize * 6 * 4 ];
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memset(m_textureBuffer, 0, _textureSize * _textureSize * 6 * 4);
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m_textureHandle = bgfx::createTextureCube(_textureSize
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, 1
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, bgfx::TextureFormat::BGRA8
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);
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}
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Atlas::Atlas(uint16_t _textureSize, const uint8_t* _textureBuffer, uint16_t _regionCount, const uint8_t* _regionBuffer, uint16_t _maxRegionsCount)
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: m_usedLayers(24)
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, m_usedFaces(6)
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, m_textureSize(_textureSize)
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, m_regionCount(_regionCount)
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, m_maxRegionCount(_regionCount < _maxRegionsCount ? _regionCount : _maxRegionsCount)
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{
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BX_CHECK(_regionCount <= 64 && _maxRegionsCount <= 4096, "_regionCount %d, _maxRegionsCount %d", _regionCount, _maxRegionsCount);
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init();
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m_regions = new AtlasRegion[_regionCount];
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m_textureBuffer = new uint8_t[getTextureBufferSize()];
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memcpy(m_regions, _regionBuffer, _regionCount * sizeof(AtlasRegion) );
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memcpy(m_textureBuffer, _textureBuffer, getTextureBufferSize() );
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m_textureHandle = bgfx::createTextureCube(_textureSize
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, 1
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, bgfx::TextureFormat::BGRA8
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, BGFX_TEXTURE_NONE
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, bgfx::makeRef(m_textureBuffer, getTextureBufferSize() )
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);
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}
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Atlas::~Atlas()
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{
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bgfx::destroyTexture(m_textureHandle);
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delete [] m_layers;
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delete [] m_regions;
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delete [] m_textureBuffer;
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}
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void Atlas::init()
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{
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m_texelSize = float(UINT16_MAX) / float(m_textureSize);
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float texelHalf = m_texelSize/2.0f;
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switch (bgfx::getRendererType() )
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{
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case bgfx::RendererType::Direct3D9:
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m_texelOffset[0] = 0.0f;
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m_texelOffset[1] = 0.0f;
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break;
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case bgfx::RendererType::Direct3D11:
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case bgfx::RendererType::Direct3D12:
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m_texelOffset[0] = texelHalf;
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m_texelOffset[1] = texelHalf;
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break;
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default:
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m_texelOffset[0] = texelHalf;
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m_texelOffset[1] = -texelHalf;
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break;
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}
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}
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uint16_t Atlas::addRegion(uint16_t _width, uint16_t _height, const uint8_t* _bitmapBuffer, AtlasRegion::Type _type, uint16_t outline)
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{
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if (m_regionCount >= m_maxRegionCount)
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{
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return UINT16_MAX;
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}
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uint16_t xx = 0;
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uint16_t yy = 0;
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uint32_t idx = 0;
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while (idx < m_usedLayers)
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{
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if (m_layers[idx].faceRegion.getType() == _type
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&& m_layers[idx].packer.addRectangle(_width + 1, _height + 1, xx, yy) )
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{
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break;
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}
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idx++;
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}
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if (idx >= m_usedLayers)
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{
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if ( (idx + _type) > 24
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|| m_usedFaces >= 6)
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{
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return UINT16_MAX;
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}
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for (int ii = 0; ii < _type; ++ii)
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{
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AtlasRegion& region = m_layers[idx + ii].faceRegion;
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region.x = 0;
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region.y = 0;
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region.width = m_textureSize;
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region.height = m_textureSize;
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region.setMask(_type, m_usedFaces, ii);
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}
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m_usedLayers += _type;
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m_usedFaces++;
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if (!m_layers[idx].packer.addRectangle(_width + 1, _height + 1, xx, yy) )
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{
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return UINT16_MAX;
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}
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}
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AtlasRegion& region = m_regions[m_regionCount];
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region.x = xx;
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region.y = yy;
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region.width = _width;
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region.height = _height;
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region.mask = m_layers[idx].faceRegion.mask;
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updateRegion(region, _bitmapBuffer);
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region.x += outline;
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region.y += outline;
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region.width -= (outline * 2);
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region.height -= (outline * 2);
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return m_regionCount++;
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}
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void Atlas::updateRegion(const AtlasRegion& _region, const uint8_t* _bitmapBuffer)
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{
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uint32_t size = _region.width * _region.height * 4;
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if (0 < size)
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{
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const bgfx::Memory* mem = bgfx::alloc(size);
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memset(mem->data, 0, mem->size);
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if (_region.getType() == AtlasRegion::TYPE_BGRA8)
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{
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const uint8_t* inLineBuffer = _bitmapBuffer;
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uint8_t* outLineBuffer = m_textureBuffer + _region.getFaceIndex() * (m_textureSize * m_textureSize * 4) + ( ( (_region.y * m_textureSize) + _region.x) * 4);
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for (int yy = 0; yy < _region.height; ++yy)
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{
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memcpy(outLineBuffer, inLineBuffer, _region.width * 4);
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inLineBuffer += _region.width * 4;
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outLineBuffer += m_textureSize * 4;
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}
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memcpy(mem->data, _bitmapBuffer, mem->size);
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}
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else
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{
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uint32_t layer = _region.getComponentIndex();
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const uint8_t* inLineBuffer = _bitmapBuffer;
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uint8_t* outLineBuffer = (m_textureBuffer + _region.getFaceIndex() * (m_textureSize * m_textureSize * 4) + ( ( (_region.y * m_textureSize) + _region.x) * 4) );
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for (int yy = 0; yy < _region.height; ++yy)
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{
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for (int xx = 0; xx < _region.width; ++xx)
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{
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outLineBuffer[(xx * 4) + layer] = inLineBuffer[xx];
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}
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memcpy(mem->data + yy * _region.width * 4, outLineBuffer, _region.width * 4);
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inLineBuffer += _region.width;
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outLineBuffer += m_textureSize * 4;
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}
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}
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bgfx::updateTextureCube(m_textureHandle, (uint8_t)_region.getFaceIndex(), 0, _region.x, _region.y, _region.width, _region.height, mem);
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}
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}
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void Atlas::packFaceLayerUV(uint32_t _idx, uint8_t* _vertexBuffer, uint32_t _offset, uint32_t _stride) const
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{
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packUV(m_layers[_idx].faceRegion, _vertexBuffer, _offset, _stride);
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}
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void Atlas::packUV(uint16_t _regionHandle, uint8_t* _vertexBuffer, uint32_t _offset, uint32_t _stride) const
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{
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const AtlasRegion& region = m_regions[_regionHandle];
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packUV(region, _vertexBuffer, _offset, _stride);
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}
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static void writeUV(uint8_t* _vertexBuffer, int16_t _x, int16_t _y, int16_t _z, int16_t _w)
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{
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uint16_t* xyzw = (uint16_t*)_vertexBuffer;
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xyzw[0] = _x;
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xyzw[1] = _y;
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xyzw[2] = _z;
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xyzw[3] = _w;
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}
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void Atlas::packUV(const AtlasRegion& _region, uint8_t* _vertexBuffer, uint32_t _offset, uint32_t _stride) const
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{
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int16_t x0 = (int16_t)( ( (float)_region.x * m_texelSize + m_texelOffset[0]) - float(INT16_MAX) );
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int16_t y0 = (int16_t)( ( (float)_region.y * m_texelSize + m_texelOffset[1]) - float(INT16_MAX) );
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int16_t x1 = (int16_t)( ( ( (float)_region.x + _region.width) * m_texelSize + m_texelOffset[0]) - float(INT16_MAX) );
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int16_t y1 = (int16_t)( ( ( (float)_region.y + _region.height) * m_texelSize + m_texelOffset[1]) - float(INT16_MAX) );
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int16_t ww = (int16_t)( (float(INT16_MAX) / 4.0f) * (float)_region.getComponentIndex() );
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_vertexBuffer += _offset;
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switch (_region.getFaceIndex() )
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{
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case 0: // +X
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x0 = -x0;
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x1 = -x1;
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y0 = -y0;
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y1 = -y1;
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writeUV(_vertexBuffer, INT16_MAX, y0, x0, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, INT16_MAX, y1, x0, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, INT16_MAX, y1, x1, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, INT16_MAX, y0, x1, ww); _vertexBuffer += _stride;
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break;
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case 1: // -X
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y0 = -y0;
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y1 = -y1;
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writeUV(_vertexBuffer, INT16_MIN, y0, x0, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, INT16_MIN, y1, x0, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, INT16_MIN, y1, x1, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, INT16_MIN, y0, x1, ww); _vertexBuffer += _stride;
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break;
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case 2: // +Y
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writeUV(_vertexBuffer, x0, INT16_MAX, y0, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, x0, INT16_MAX, y1, ww); _vertexBuffer += _stride;
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writeUV(_vertexBuffer, x1, INT16_MAX, y1, ww); _vertexBuffer += _stride;
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|
writeUV(_vertexBuffer, x1, INT16_MAX, y0, ww); _vertexBuffer += _stride;
|
|
break;
|
|
|
|
case 3: // -Y
|
|
y0 = -y0;
|
|
y1 = -y1;
|
|
writeUV(_vertexBuffer, x0, INT16_MIN, y0, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x0, INT16_MIN, y1, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x1, INT16_MIN, y1, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x1, INT16_MIN, y0, ww); _vertexBuffer += _stride;
|
|
break;
|
|
|
|
case 4: // +Z
|
|
y0 = -y0;
|
|
y1 = -y1;
|
|
writeUV(_vertexBuffer, x0, y0, INT16_MAX, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x0, y1, INT16_MAX, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x1, y1, INT16_MAX, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x1, y0, INT16_MAX, ww); _vertexBuffer += _stride;
|
|
break;
|
|
|
|
case 5: // -Z
|
|
x0 = -x0;
|
|
x1 = -x1;
|
|
y0 = -y0;
|
|
y1 = -y1;
|
|
writeUV(_vertexBuffer, x0, y0, INT16_MIN, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x0, y1, INT16_MIN, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x1, y1, INT16_MIN, ww); _vertexBuffer += _stride;
|
|
writeUV(_vertexBuffer, x1, y0, INT16_MIN, ww); _vertexBuffer += _stride;
|
|
break;
|
|
}
|
|
}
|