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