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|
/*
* Copyright 2018 Ales Mlakar. All rights reserved.
* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
*/
/*
* Reference(s):
* - Sparse Virtual Textures by Sean Barrett
* http://web.archive.org/web/20190103162611/http://silverspaceship.com/src/svt/
* - Based on Virtual Texture Demo by Brad Blanchard
* http://web.archive.org/web/20190103162638/http://linedef.com/virtual-texture-demo.html
* - Mars texture
* http://web.archive.org/web/20190103162730/http://www.celestiamotherlode.net/catalog/mars.php
*/
#include <bx/file.h>
#include <bx/sort.h>
#include "vt.h"
namespace vt
{
// Constants
static const int s_channelCount = 4;
static const int s_tileFileDataOffset = sizeof(VirtualTextureInfo);
// Page
Page::operator size_t() const
{
return size_t((uint32_t(m_mip) << 16) | uint32_t((uint16_t(m_x) << 8) | uint16_t(m_y)));
}
// PageCount
PageCount::PageCount(Page _page, int _count)
: m_page(_page)
, m_count(_count)
{
}
int PageCount::compareTo(const PageCount& other) const
{
if (other.m_page.m_mip != m_page.m_mip)
{
return bx::clamp<int>(other.m_page.m_mip - m_page.m_mip, -1, 1);
}
return bx::clamp<int>(other.m_count - m_count, -1, 1);
}
// VirtualTextureInfo
VirtualTextureInfo::VirtualTextureInfo()
: m_virtualTextureSize(0)
, m_tileSize(0)
, m_borderSize(0)
{
}
int VirtualTextureInfo::GetPageSize() const
{
return m_tileSize + 2 * m_borderSize;
}
int VirtualTextureInfo::GetPageTableSize() const
{
return m_virtualTextureSize / m_tileSize;
}
StagingPool::StagingPool(int _width, int _height, int _count, bool _readBack)
: m_stagingTextureIndex(0)
, m_width(_width)
, m_height(_height)
, m_flags(0)
{
m_flags = BGFX_TEXTURE_BLIT_DST | BGFX_SAMPLER_UVW_CLAMP;
if (_readBack)
{
m_flags |= BGFX_TEXTURE_READ_BACK;
}
grow(_count);
}
StagingPool::~StagingPool()
{
for (int i = 0; i < (int)m_stagingTextures.size(); ++i)
{
bgfx::destroy(m_stagingTextures[i]);
}
}
void StagingPool::grow(int count)
{
while ((int)m_stagingTextures.size() < count)
{
auto stagingTexture = bgfx::createTexture2D((uint16_t)m_width, (uint16_t)m_height, false, 1, bgfx::TextureFormat::BGRA8, m_flags);
m_stagingTextures.push_back(stagingTexture);
}
}
bgfx::TextureHandle StagingPool::getTexture()
{
return m_stagingTextures[m_stagingTextureIndex];
}
void StagingPool::next()
{
m_stagingTextureIndex = (m_stagingTextureIndex + 1) % (int)m_stagingTextures.size();
}
PageIndexer::PageIndexer(VirtualTextureInfo* _info)
: m_info(_info)
{
m_mipcount = int(bx::log2((float)m_info->GetPageTableSize()) + 1);
m_sizes.resize(m_mipcount);
for (int i = 0; i < m_mipcount; ++i)
{
m_sizes[i] = (m_info->m_virtualTextureSize / m_info->m_tileSize) >> i;
}
m_offsets.resize(m_mipcount);
m_count = 0;
for (int i = 0; i < m_mipcount; ++i)
{
m_offsets[i] = m_count;
m_count += m_sizes[i] * m_sizes[i];
}
// Calculate reverse mapping
m_reverse.resize(m_count);
for (int i = 0; i < m_mipcount; ++i)
{
int size = m_sizes[i];
for (int y = 0; y < size; ++y)
{
for (int x = 0; x < size; ++x)
{
Page page = { x, y, i };
m_reverse[getIndexFromPage(page)] = page;
}
}
}
}
int PageIndexer::getIndexFromPage(Page page)
{
int offset = m_offsets[page.m_mip];
int stride = m_sizes[page.m_mip];
return offset + page.m_y * stride + page.m_x;
}
Page PageIndexer::getPageFromIndex(int index)
{
return m_reverse[index];
}
bool PageIndexer::isValid(Page page)
{
if (page.m_mip < 0)
{
return false;
}
if (page.m_mip >= m_mipcount)
{
return false;
}
if (page.m_x < 0)
{
return false;
}
if (page.m_x >= m_sizes[page.m_mip])
{
return false;
}
if (page.m_y < 0)
{
return false;
}
if (page.m_y >= m_sizes[page.m_mip])
{
return false;
}
return true;
}
int PageIndexer::getCount() const
{
return m_count;
}
int PageIndexer::getMipCount() const
{
return m_mipcount;
}
SimpleImage::SimpleImage(int _width, int _height, int _channelCount, uint8_t _clearValue)
: m_width(_width)
, m_height(_height)
, m_channelCount(_channelCount)
{
m_data.resize(m_width * m_height * m_channelCount);
clear(_clearValue);
}
SimpleImage::SimpleImage(int _width, int _height, int _channelCount, tinystl::vector<uint8_t>& _data)
: m_width(_width)
, m_height(_height)
, m_channelCount(_channelCount)
{
m_data = _data;
}
void SimpleImage::copy(Point dest_offset, SimpleImage& src, Rect src_rect)
{
int width = bx::min(m_width - dest_offset.m_x, src_rect.m_width);
int height = bx::min(m_height - dest_offset.m_y, src_rect.m_height);
int channels = bx::min(m_channelCount, src.m_channelCount);
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
int i1 = ((j + dest_offset.m_y) * m_width + (i + dest_offset.m_x)) * m_channelCount;
int i2 = ((j + src_rect.m_y) * src.m_width + (i + src_rect.m_x)) * src.m_channelCount;
for (int c = 0; c < channels; ++c)
{
m_data[i1 + c] = src.m_data[i2 + c];
}
}
}
}
void SimpleImage::clear(uint8_t clearValue)
{
bx::memSet(&m_data[0], clearValue, m_width * m_height * m_channelCount);
}
void SimpleImage::fill(Rect rect, uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
for (int y = rect.minY(); y < rect.maxY(); ++y)
{
for (int x = rect.minX(); x < rect.maxX(); ++x)
{
m_data[m_channelCount * (y * m_width + x) + 0] = b;
m_data[m_channelCount * (y * m_width + x) + 1] = g;
m_data[m_channelCount * (y * m_width + x) + 2] = r;
m_data[m_channelCount * (y * m_width + x) + 3] = a;
}
}
}
void SimpleImage::mipmap(uint8_t* source, int size, int channels, uint8_t* dest)
{
int mipsize = size / 2;
for (int y = 0; y < mipsize; ++y)
{
for (int x = 0; x < mipsize; ++x)
{
for (int c = 0; c < channels; ++c)
{
int index = channels * ((y * 2) * size + (x * 2)) + c;
int sum_value = 4 >> 1;
sum_value += source[index + channels * (0 * size + 0)];
sum_value += source[index + channels * (0 * size + 1)];
sum_value += source[index + channels * (1 * size + 0)];
sum_value += source[index + channels * (1 * size + 1)];
dest[channels * (y * mipsize + x) + c] = (uint8_t)(sum_value / 4);
}
}
}
}
Quadtree::Quadtree(Rect _rect, int _level)
: m_rectangle(_rect)
, m_level(_level)
{
for (int i = 0; i < 4; ++i)
{
m_children[i] = nullptr;
}
}
Quadtree::~Quadtree()
{
for (int i = 0; i < 4; ++i)
{
if (m_children[i] != nullptr)
{
bx::deleteObject(VirtualTexture::getAllocator(), m_children[i]);
}
}
}
void Quadtree::add(Page request, Point mapping)
{
int scale = 1 << request.m_mip; // Same as pow( 2, mip )
int x = request.m_x * scale;
int y = request.m_y * scale;
Quadtree* node = this;
while (request.m_mip < node->m_level)
{
for (int i = 0; i < 4; ++i)
{
auto rect = node->getRectangle(i);
if (rect.contains({ x, y }))
{
// Create a new one if needed
if (node->m_children[i] == nullptr)
{
node->m_children[i] = BX_NEW(VirtualTexture::getAllocator(), Quadtree)(rect, node->m_level - 1);
node = node->m_children[i];
break;
}
// Otherwise traverse the tree
else
{
node = node->m_children[i];
break;
}
}
}
}
// We have created the correct node, now set the mapping
node->m_mapping = mapping;
}
void Quadtree::remove(Page request)
{
int index;
auto node = findPage(this, request, &index);
if (node != nullptr)
{
bx::deleteObject(VirtualTexture::getAllocator(), node->m_children[index]);
node->m_children[index] = nullptr;
}
}
void Quadtree::write(SimpleImage& image, int miplevel)
{
write(this, image, miplevel);
}
Rect Quadtree::getRectangle(int index)
{
int x = m_rectangle.m_x;
int y = m_rectangle.m_y;
int w = m_rectangle.m_width / 2;
int h = m_rectangle.m_width / 2;
switch (index)
{
case 0: return { x , y , w, h };
case 1: return { x + w, y , w, h };
case 2: return { x + w, y + h, w, h };
case 3: return { x , y + h, w, h };
default: break;
}
return { 0, 0, 0, 0 };
}
void Quadtree::write(Quadtree* node, SimpleImage& image, int miplevel)
{
if (node->m_level >= miplevel)
{
int rx = node->m_rectangle.m_x >> miplevel;
int ry = node->m_rectangle.m_y >> miplevel;
int rw = node->m_rectangle.m_width >> miplevel;
int rh = node->m_rectangle.m_width >> miplevel;
image.fill({ rx, ry, rw, rh }, (uint8_t)node->m_mapping.m_x, (uint8_t)node->m_mapping.m_y, (uint8_t)node->m_level, 255);
for (int i = 0; i < 4; ++i)
{
auto child = node->m_children[i];
if (child != nullptr)
{
Quadtree::write(child, image, miplevel);
}
}
}
}
Quadtree* Quadtree::findPage(Quadtree* node, Page request, int* index)
{
int scale = 1 << request.m_mip; // Same as pow( 2, mip )
int x = request.m_x * scale;
int y = request.m_y * scale;
// Find the parent of the child we want to remove
bool exitloop = false;
while (!exitloop)
{
exitloop = true;
for (int i = 0; i < 4; ++i)
{
if (node->m_children[i] != nullptr && node->m_children[i]->m_rectangle.contains({ x, y }))
{
// We found it
if (request.m_mip == node->m_level - 1)
{
*index = i;
return node;
}
// Check the children
else
{
node = node->m_children[i];
exitloop = false;
}
}
}
}
// We couldn't find it so it must not exist anymore
*index = -1;
return nullptr;
}
// PageTable
PageTable::PageTable(PageCache* _cache, VirtualTextureInfo* _info, PageIndexer* _indexer)
: m_info(_info)
, m_indexer(_indexer)
, m_quadtree(nullptr)
, m_quadtreeDirty(true) // Force quadtree dirty on startup
{
auto size = m_info->GetPageTableSize();
m_quadtree = BX_NEW(VirtualTexture::getAllocator(), Quadtree)({ 0, 0, size, size }, (int)bx::log2((float)size));
m_texture = bgfx::createTexture2D((uint16_t)size, (uint16_t)size, true, 1, bgfx::TextureFormat::BGRA8, BGFX_SAMPLER_UVW_CLAMP | BGFX_SAMPLER_POINT | BGFX_TEXTURE_BLIT_DST);
_cache->added = [=](Page page, Point pt) { m_quadtreeDirty = true; m_quadtree->add(page, pt); };
_cache->removed = [=](Page page, Point pt) { m_quadtreeDirty = true; m_quadtree->remove(page); BX_UNUSED(pt); };
auto PageTableSizeLog2 = m_indexer->getMipCount();
for (int i = 0; i < PageTableSizeLog2; ++i)
{
int mipSize = m_info->GetPageTableSize() >> i;
auto simpleImage = BX_NEW(VirtualTexture::getAllocator(), SimpleImage)(mipSize, mipSize, s_channelCount);
auto stagingTexture = bgfx::createTexture2D((uint16_t)mipSize, (uint16_t)mipSize, false, 1, bgfx::TextureFormat::BGRA8, BGFX_SAMPLER_UVW_CLAMP | BGFX_SAMPLER_POINT);
m_images.push_back(simpleImage);
m_stagingTextures.push_back(stagingTexture);
}
}
PageTable::~PageTable()
{
bx::deleteObject(VirtualTexture::getAllocator(), m_quadtree);
bgfx::destroy(m_texture);
for (int i = 0; i < (int)m_images.size(); ++i)
{
bx::deleteObject(VirtualTexture::getAllocator(), m_images[i]);
}
for (int i = 0; i < (int)m_stagingTextures.size(); ++i)
{
bgfx::destroy(m_stagingTextures[i]);
}
}
void PageTable::update(bgfx::ViewId blitViewId)
{
if (!m_quadtreeDirty)
{
return;
}
m_quadtreeDirty = false;
auto PageTableSizeLog2 = m_indexer->getMipCount();
for (int i = 0; i < PageTableSizeLog2; ++i)
{
m_quadtree->write(*m_images[i], i);
auto stagingTexture = m_stagingTextures[i];
auto size = uint16_t(m_info->GetPageTableSize() >> i);
bgfx::updateTexture2D(stagingTexture, 0, 0, 0, 0, size, size, bgfx::copy(&m_images[i]->m_data[0], size * size * s_channelCount));
bgfx::blit(blitViewId, m_texture, uint8_t(i), 0, 0, 0, stagingTexture, 0, 0, 0, 0, size, size);
}
}
bgfx::TextureHandle PageTable::getTexture()
{
return m_texture;
}
// PageLoader
PageLoader::PageLoader(TileDataFile* _tileDataFile, PageIndexer* _indexer, VirtualTextureInfo* _info)
: m_colorMipLevels(false)
, m_showBorders(false)
, m_tileDataFile(_tileDataFile)
, m_indexer(_indexer)
, m_info(_info)
{
}
void PageLoader::submit(Page request)
{
ReadState state;
state.m_page = request;
loadPage(state);
onPageLoadComplete(state);
}
void PageLoader::loadPage(ReadState& state)
{
int size = m_info->GetPageSize() * m_info->GetPageSize() * s_channelCount;
state.m_data.resize(size);
if (m_colorMipLevels)
{
copyColor(&state.m_data[0], state.m_page);
}
else if (m_tileDataFile != nullptr)
{
m_tileDataFile->readPage(m_indexer->getIndexFromPage(state.m_page), &state.m_data[0]);
}
if (m_showBorders)
{
copyBorder(&state.m_data[0]);
}
}
void PageLoader::onPageLoadComplete(ReadState& state)
{
loadComplete(state.m_page, &state.m_data[0]);
}
void PageLoader::copyBorder(uint8_t* image)
{
int pagesize = m_info->GetPageSize();
int bordersize = m_info->m_borderSize;
for (int i = 0; i < pagesize; ++i)
{
int xindex = bordersize * pagesize + i;
image[xindex * s_channelCount + 0] = 0;
image[xindex * s_channelCount + 1] = 255;
image[xindex * s_channelCount + 2] = 0;
image[xindex * s_channelCount + 3] = 255;
int yindex = i * pagesize + bordersize;
image[yindex * s_channelCount + 0] = 0;
image[yindex * s_channelCount + 1] = 255;
image[yindex * s_channelCount + 2] = 0;
image[yindex * s_channelCount + 3] = 255;
}
}
void PageLoader::copyColor(uint8_t* image, Page request)
{
static const Color colors[] =
{
{ 0, 0, 255, 255 },
{ 0, 255, 255, 255 },
{ 255, 0, 0, 255 },
{ 255, 0, 255, 255 },
{ 255, 255, 0, 255 },
{ 64, 64, 192, 255 },
{ 64, 192, 64, 255 },
{ 64, 192, 192, 255 },
{ 192, 64, 64, 255 },
{ 192, 64, 192, 255 },
{ 192, 192, 64, 255 },
{ 0, 255, 0, 255 },
};
int pagesize = m_info->GetPageSize();
for (int y = 0; y < pagesize; ++y)
{
for (int x = 0; x < pagesize; ++x)
{
image[(y * pagesize + x) * s_channelCount + 0] = colors[request.m_mip].m_b;
image[(y * pagesize + x) * s_channelCount + 1] = colors[request.m_mip].m_g;
image[(y * pagesize + x) * s_channelCount + 2] = colors[request.m_mip].m_r;
image[(y * pagesize + x) * s_channelCount + 3] = colors[request.m_mip].m_a;
}
}
}
PageCache::PageCache(TextureAtlas* _atlas, PageLoader* _loader, int _count)
: m_atlas(_atlas)
, m_loader(_loader)
, m_count(_count)
{
clear();
m_loader->loadComplete = [&](Page page, uint8_t* data) { loadComplete(page, data); };
}
// Update the pages's position in the lru
bool PageCache::touch(Page page)
{
if (m_loading.find(page) == m_loading.end())
{
if (m_lru_used.find(page) != m_lru_used.end())
{
// Find the page (slow!!) and add it to the back of the list
for (auto it = m_lru.begin(); it != m_lru.end(); ++it)
{
if (it->m_page == page)
{
auto lruPage = *it;
m_lru.erase(it);
m_lru.push_back(lruPage);
return true;
}
}
return false;
}
}
return false;
}
// Schedule a load if not already loaded or loading
bool PageCache::request(Page request, bgfx::ViewId blitViewId)
{
m_blitViewId = blitViewId;
if (m_loading.find(request) == m_loading.end())
{
if (m_lru_used.find(request) == m_lru_used.end())
{
m_loading.insert(request);
m_loader->submit(request);
return true;
}
}
return false;
}
void PageCache::clear()
{
for (auto& lru_page : m_lru)
{
if (m_lru_used.find(lru_page.m_page) != m_lru_used.end())
{
removed(lru_page.m_page, lru_page.m_point);
}
}
m_lru_used.clear();
m_lru.clear();
m_lru.reserve(m_count * m_count);
m_current = 0;
}
void PageCache::loadComplete(Page page, uint8_t* data)
{
m_loading.erase(page);
// Find a place in the atlas for the data
Point pt;
if (m_current == m_count * m_count)
{
// Remove the oldest lru page and remember it's location so we can use it
auto lru_page = m_lru[0];
m_lru.erase(m_lru.begin());
m_lru_used.erase(lru_page.m_page);
pt = lru_page.m_point;
// Notify that we removed a page
removed(lru_page.m_page, lru_page.m_point);
}
else
{
pt = { m_current % m_count, m_current / m_count };
++m_current;
if (m_current == m_count * m_count)
{
bx::debugPrintf("Atlas is full!");
}
}
// Notify atlas that he can upload the page and add the page to lru
m_atlas->uploadPage(pt, data, m_blitViewId);
m_lru.push_back({ page, pt });
m_lru_used.insert(page);
// Signal that we added a page
added(page, pt);
}
// TextureAtlas
TextureAtlas::TextureAtlas(VirtualTextureInfo* _info, int _count, int _uploadsperframe)
: m_info(_info)
, m_stagingPool(_info->GetPageSize(), _info->GetPageSize(), _uploadsperframe, false)
{
// Create atlas texture
int pagesize = m_info->GetPageSize();
int size = _count * pagesize;
m_texture = bgfx::createTexture2D(
(uint16_t)size
, (uint16_t)size
, false
, 1
, bgfx::TextureFormat::BGRA8
, BGFX_SAMPLER_UVW_CLAMP | BGFX_TEXTURE_BLIT_DST
);
}
TextureAtlas::~TextureAtlas()
{
bgfx::destroy(m_texture);
}
void TextureAtlas::setUploadsPerFrame(int count)
{
m_stagingPool.grow(count);
}
void TextureAtlas::uploadPage(Point pt, uint8_t* data, bgfx::ViewId blitViewId)
{
// Get next staging texture to write to
auto writer = m_stagingPool.getTexture();
m_stagingPool.next();
// Update texture with new atlas data
auto pagesize = uint16_t(m_info->GetPageSize());
bgfx::updateTexture2D(
writer
, 0
, 0
, 0
, 0
, pagesize
, pagesize
, bgfx::copy(data, pagesize * pagesize * s_channelCount)
);
// Copy the texture part to the actual atlas texture
auto xpos = uint16_t(pt.m_x * pagesize);
auto ypos = uint16_t(pt.m_y * pagesize);
bgfx::blit(blitViewId, m_texture, 0, xpos, ypos, 0, writer, 0, 0, 0, 0, pagesize, pagesize);
}
bgfx::TextureHandle TextureAtlas::getTexture()
{
return m_texture;
}
// FeedbackBuffer
FeedbackBuffer::FeedbackBuffer(VirtualTextureInfo* _info, int _width, int _height)
: m_info(_info)
, m_width(_width)
, m_height(_height)
, m_stagingPool(_width, _height, 1, true)
{
// Setup classes
m_indexer = BX_NEW(VirtualTexture::getAllocator(), PageIndexer)(m_info);
m_requests.resize(m_indexer->getCount());
// Initialize and clear buffers
m_downloadBuffer.resize(m_width * m_height * s_channelCount);
bx::memSet(&m_downloadBuffer[0], 0, m_width * m_height * s_channelCount);
clear();
// Initialize feedback frame buffer
bgfx::TextureHandle feedbackFrameBufferTextures[] =
{
bgfx::createTexture2D(uint16_t(m_width), uint16_t(m_height), false, 1, bgfx::TextureFormat::BGRA8, BGFX_TEXTURE_RT),
bgfx::createTexture2D(uint16_t(m_width), uint16_t(m_height), false, 1, bgfx::TextureFormat::D32F, BGFX_TEXTURE_RT),
};
m_feedbackFrameBuffer = bgfx::createFrameBuffer(BX_COUNTOF(feedbackFrameBufferTextures), feedbackFrameBufferTextures, true);
m_lastStagingTexture = { bgfx::kInvalidHandle };
}
FeedbackBuffer::~FeedbackBuffer()
{
bx::deleteObject(VirtualTexture::getAllocator(), m_indexer);
bgfx::destroy(m_feedbackFrameBuffer);
}
void FeedbackBuffer::clear()
{
// Clear Table
bx::memSet(&m_requests[0], 0, sizeof(int) * m_indexer->getCount());
}
void FeedbackBuffer::copy(bgfx::ViewId viewId)
{
m_lastStagingTexture = m_stagingPool.getTexture();
// Copy feedback buffer render target to staging texture
bgfx::blit(viewId, m_lastStagingTexture, 0, 0, bgfx::getTexture(m_feedbackFrameBuffer));
m_stagingPool.next();
}
void FeedbackBuffer::download()
{
// Check if there's an already rendered feedback buffer available
if (m_lastStagingTexture.idx == bgfx::kInvalidHandle)
{
return;
}
// Read the texture
bgfx::readTexture(m_lastStagingTexture, &m_downloadBuffer[0]);
// Loop through pixels and check if anything was written
auto data = &m_downloadBuffer[0];
auto colors = (Color*)data;
auto dataSize = m_width * m_height;
for (int i = 0; i < dataSize; ++i)
{
auto& color = colors[i];
if (color.m_a >= 0xff)
{
// Page found! Add it to the request queue
Page request = { color.m_b, color.m_g, color.m_r };
addRequestAndParents(request);
// Clear the pixel, so that we don't have to do it in another pass
color = { 0,0,0,0 };
}
}
}
// This function validates the pages and adds the page's parents
// We do this so that we can fall back to them if we run out of memory
void FeedbackBuffer::addRequestAndParents(Page request)
{
auto PageTableSizeLog2 = m_indexer->getMipCount();
auto count = PageTableSizeLog2 - request.m_mip;
for (int i = 0; i < count; ++i)
{
int xpos = request.m_x >> i;
int ypos = request.m_y >> i;
Page page = { xpos, ypos, request.m_mip + i };
// If it's not a valid page (position or mip out of range) just skip it
if (!m_indexer->isValid(page))
{
return;
}
++m_requests[m_indexer->getIndexFromPage(page)];
}
}
const tinystl::vector<int>& FeedbackBuffer::getRequests() const
{
return m_requests;
}
bgfx::FrameBufferHandle FeedbackBuffer::getFrameBuffer()
{
return m_feedbackFrameBuffer;
}
int FeedbackBuffer::getWidth() const
{
return m_width;
}
int FeedbackBuffer::getHeight() const
{
return m_height;
}
// VirtualTexture
VirtualTexture::VirtualTexture(TileDataFile* _tileDataFile, VirtualTextureInfo* _info, int _atlassize, int _uploadsperframe, int _mipBias)
: m_tileDataFile(_tileDataFile)
, m_info(_info)
, m_uploadsPerFrame(_uploadsperframe)
, m_mipBias(_mipBias)
{
m_atlasCount = _atlassize / m_info->GetPageSize();
// Setup indexer
m_indexer = BX_NEW(VirtualTexture::getAllocator(), PageIndexer)(m_info);
m_pagesToLoad.reserve(m_indexer->getCount());
// Setup classes
m_atlas = BX_NEW(VirtualTexture::getAllocator(), TextureAtlas)(m_info, m_atlasCount, m_uploadsPerFrame);
m_loader = BX_NEW(VirtualTexture::getAllocator(), PageLoader)(m_tileDataFile, m_indexer, m_info);
m_cache = BX_NEW(VirtualTexture::getAllocator(), PageCache)(m_atlas, m_loader, m_atlasCount);
m_pageTable = BX_NEW(VirtualTexture::getAllocator(), PageTable)(m_cache, m_info, m_indexer);
// Create uniforms
u_vt_settings_1 = bgfx::createUniform("u_vt_settings_1", bgfx::UniformType::Vec4);
u_vt_settings_2 = bgfx::createUniform("u_vt_settings_2", bgfx::UniformType::Vec4);
s_vt_page_table = bgfx::createUniform("s_vt_page_table", bgfx::UniformType::Sampler);
s_vt_texture_atlas = bgfx::createUniform("s_vt_texture_atlas", bgfx::UniformType::Sampler);
}
VirtualTexture::~VirtualTexture()
{
// Destroy
bx::deleteObject(VirtualTexture::getAllocator(), m_indexer);
bx::deleteObject(VirtualTexture::getAllocator(), m_atlas);
bx::deleteObject(VirtualTexture::getAllocator(), m_loader);
bx::deleteObject(VirtualTexture::getAllocator(), m_cache);
bx::deleteObject(VirtualTexture::getAllocator(), m_pageTable);
// Destroy all uniforms and textures
bgfx::destroy(u_vt_settings_1);
bgfx::destroy(u_vt_settings_2);
bgfx::destroy(s_vt_page_table);
bgfx::destroy(s_vt_texture_atlas);
}
int VirtualTexture::getMipBias() const
{
return m_mipBias;
}
void VirtualTexture::setMipBias(int value)
{
m_mipBias = bx::max(0, value);
}
void VirtualTexture::setUniforms()
{
struct
{
struct
{
float VirtualTextureSize;
float ooAtlasScale;
float BorderScale;
float BorderOffset;
} m_settings_1;
struct
{
float MipBias;
float PageTableSize;
float unused1;
float unused2;
} m_settings_2;
} uniforms;
int pagesize = m_info->GetPageSize();
uniforms.m_settings_1.VirtualTextureSize = (float)m_info->m_virtualTextureSize;
uniforms.m_settings_1.ooAtlasScale = 1.0f / (float)m_atlasCount;
uniforms.m_settings_1.BorderScale = (float)((pagesize - 2.0f * m_info->m_borderSize) / pagesize);
uniforms.m_settings_1.BorderOffset = (float)m_info->m_borderSize / (float)pagesize;
uniforms.m_settings_2.MipBias = (float)m_mipBias;
uniforms.m_settings_2.PageTableSize = (float)m_info->GetPageTableSize();
uniforms.m_settings_2.unused1 = uniforms.m_settings_2.unused2 = 0.0f;
bgfx::setUniform(u_vt_settings_1, &uniforms.m_settings_1);
bgfx::setUniform(u_vt_settings_2, &uniforms.m_settings_2);
bgfx::setTexture(0, s_vt_page_table, m_pageTable->getTexture());
bgfx::setTexture(1, s_vt_texture_atlas, m_atlas->getTexture());
}
void VirtualTexture::setUploadsPerFrame(int count)
{
m_uploadsPerFrame = count;
m_atlas->setUploadsPerFrame(count);
}
int VirtualTexture::getUploadsPerFrame() const
{
return m_uploadsPerFrame;
}
void VirtualTexture::enableShowBoarders(bool enable)
{
if (m_loader->m_showBorders == enable)
{
return;
}
m_loader->m_showBorders = enable;
clear();
}
bool VirtualTexture::isShowBoardersEnabled() const
{
return m_loader->m_showBorders;
}
void VirtualTexture::enableColorMipLevels(bool enable)
{
if (m_loader->m_colorMipLevels == enable)
{
return;
}
m_loader->m_colorMipLevels = enable;
clear();
}
bool VirtualTexture::isColorMipLevelsEnabled() const
{
return m_loader->m_colorMipLevels;
}
bgfx::TextureHandle VirtualTexture::getAtlastTexture()
{
return m_atlas->getTexture();
}
bgfx::TextureHandle VirtualTexture::getPageTableTexture()
{
return m_pageTable->getTexture();
}
void VirtualTexture::clear()
{
m_cache->clear();
}
void VirtualTexture::update(const tinystl::vector<int>& requests, bgfx::ViewId blitViewId)
{
m_pagesToLoad.clear();
// Find out what is already in memory
// If it is, update it's position in the LRU collection
// Otherwise add it to the list of pages to load
int touched = 0;
for (int i = 0; i < (int)requests.size(); ++i)
{
if (requests[i] > 0)
{
PageCount pc(m_indexer->getPageFromIndex(i), requests[i]);
if (!m_cache->touch(pc.m_page))
{
m_pagesToLoad.push_back(pc);
}
else
{
++touched;
}
}
}
// Check to make sure we don't thrash
if (touched < m_atlasCount * m_atlasCount)
{
// sort by low res to high res and number of requests
bx::quickSort(
m_pagesToLoad.begin()
, uint32_t(m_pagesToLoad.size())
, sizeof(vt::PageCount)
, [](const void* _a, const void* _b) -> int32_t {
const vt::PageCount& lhs = *(const vt::PageCount*)(_a);
const vt::PageCount& rhs = *(const vt::PageCount*)(_b);
return lhs.compareTo(rhs);
});
// if more pages than will fit in memory or more than update per frame drop high res pages with lowest use count
int loadcount = bx::min(bx::min((int)m_pagesToLoad.size(), m_uploadsPerFrame), m_atlasCount * m_atlasCount);
for (int i = 0; i < loadcount; ++i)
m_cache->request(m_pagesToLoad[i].m_page, blitViewId);
}
else
{
// The problem here is that all pages in cache are requested and the new or high res ones don't get uploaded
// We can adjust the mip bias to make it all fit. This solves the problem of page cache thrashing
--m_mipBias;
}
// Update the page table
m_pageTable->update(blitViewId);
}
bx::AllocatorI* VirtualTexture::s_allocator = nullptr;
void VirtualTexture::setAllocator(bx::AllocatorI* allocator)
{
s_allocator = allocator;
}
bx::AllocatorI* VirtualTexture::getAllocator()
{
return s_allocator;
}
TileDataFile::TileDataFile(const bx::FilePath& filename, VirtualTextureInfo* _info, bool _readWrite) : m_info(_info)
{
const char* access = _readWrite ? "w+b" : "rb";
m_file = fopen(filename.getCPtr(), access);
m_size = m_info->GetPageSize() * m_info->GetPageSize() * s_channelCount;
}
TileDataFile::~TileDataFile()
{
fclose(m_file);
}
void TileDataFile::readInfo()
{
fseek(m_file, 0, SEEK_SET);
auto ret = fread(m_info, sizeof(*m_info), 1, m_file);
BX_UNUSED(ret);
m_size = m_info->GetPageSize() * m_info->GetPageSize() * s_channelCount;
}
void TileDataFile::writeInfo()
{
fseek(m_file, 0, SEEK_SET);
auto ret = fwrite(m_info, sizeof(*m_info), 1, m_file);
BX_UNUSED(ret);
}
void TileDataFile::readPage(int index, uint8_t* data)
{
fseek(m_file, m_size * index + s_tileFileDataOffset, SEEK_SET);
auto ret = fread(data, m_size, 1, m_file);
BX_UNUSED(ret);
}
void TileDataFile::writePage(int index, uint8_t* data)
{
fseek(m_file, m_size * index + s_tileFileDataOffset, SEEK_SET);
auto ret = fwrite(data, m_size, 1, m_file);
BX_UNUSED(ret);
}
// TileGenerator
TileGenerator::TileGenerator(VirtualTextureInfo* _info)
: m_info(_info)
, m_indexer(nullptr)
, m_tileDataFile(nullptr)
, m_sourceImage(nullptr)
, m_page1Image(nullptr)
, m_page2Image(nullptr)
, m_2xtileImage(nullptr)
, m_4xtileImage(nullptr)
, m_tileImage(nullptr)
{
m_tilesize = m_info->m_tileSize;
m_pagesize = m_info->GetPageSize();
}
TileGenerator::~TileGenerator()
{
if (m_sourceImage != nullptr)
{
bimg::imageFree(m_sourceImage);
}
bx::deleteObject(VirtualTexture::getAllocator(), m_indexer);
bx::deleteObject(VirtualTexture::getAllocator(), m_page1Image);
bx::deleteObject(VirtualTexture::getAllocator(), m_page2Image);
bx::deleteObject(VirtualTexture::getAllocator(), m_2xtileImage);
bx::deleteObject(VirtualTexture::getAllocator(), m_4xtileImage);
bx::deleteObject(VirtualTexture::getAllocator(), m_tileImage);
}
bool TileGenerator::generate(const bx::FilePath& _filePath)
{
const bx::StringView baseName = _filePath.getBaseName();
// Generate cache filename
char tmp[256];
bx::snprintf(tmp, sizeof(tmp), "%.*s.vt", baseName.getLength(), baseName.getPtr() );
bx::FilePath cacheFilePath("temp");
cacheFilePath.join(tmp);
// Check if tile file already exist
{
bx::Error err;
bx::FileReader fileReader;
if (bx::open(&fileReader, cacheFilePath, &err) )
{
bx::close(&fileReader);
bx::debugPrintf("Tile data file '%s' already exists. Skipping generation.\n", cacheFilePath.getCPtr() );
return true;
}
}
// Read image
{
bx::debugPrintf("Reading image '%s'.\n", _filePath.getCPtr() );
bx::Error err;
bx::FileReader fileReader;
if (!bx::open(&fileReader, _filePath, &err) )
{
bx::debugPrintf("Image open failed'%s'.\n", _filePath.getCPtr() );
return false;
}
int64_t size = bx::getSize(&fileReader);
if (0 == size)
{
bx::debugPrintf("Image '%s' size is 0.\n", _filePath.getCPtr() );
return false;
}
uint8_t* rawImage = (uint8_t*)bx::alloc(VirtualTexture::getAllocator(), size_t(size) );
bx::read(&fileReader, rawImage, int32_t(size), &err);
bx::close(&fileReader);
if (!err.isOk() )
{
bx::debugPrintf("Image read failed'%s'.\n", _filePath.getCPtr() );
bx::free(VirtualTexture::getAllocator(), rawImage);
return false;
}
m_sourceImage = bimg::imageParse(VirtualTexture::getAllocator(), rawImage, uint32_t(size), bimg::TextureFormat::BGRA8, &err);
bx::free(VirtualTexture::getAllocator(), rawImage);
if (!err.isOk() )
{
bx::debugPrintf("Image parse failed'%s'.\n", _filePath.getCPtr() );
return false;
}
}
// Setup
m_info->m_virtualTextureSize = int(m_sourceImage->m_width);
m_indexer = BX_NEW(VirtualTexture::getAllocator(), PageIndexer)(m_info);
// Open tile data file
m_tileDataFile = BX_NEW(VirtualTexture::getAllocator(), TileDataFile)(cacheFilePath, m_info, true);
m_page1Image = BX_NEW(VirtualTexture::getAllocator(), SimpleImage)(m_pagesize, m_pagesize, s_channelCount, 0xff);
m_page2Image = BX_NEW(VirtualTexture::getAllocator(), SimpleImage)(m_pagesize, m_pagesize, s_channelCount, 0xff);
m_tileImage = BX_NEW(VirtualTexture::getAllocator(), SimpleImage)(m_tilesize, m_tilesize, s_channelCount, 0xff);
m_2xtileImage = BX_NEW(VirtualTexture::getAllocator(), SimpleImage)(m_tilesize * 2, m_tilesize * 2, s_channelCount, 0xff);
m_4xtileImage = BX_NEW(VirtualTexture::getAllocator(), SimpleImage)(m_tilesize * 4, m_tilesize * 4, s_channelCount, 0xff);
// Generate tiles
bx::debugPrintf("Generating tiles\n");
auto mipcount = m_indexer->getMipCount();
for (int i = 0; i < mipcount; ++i)
{
int count = (m_info->m_virtualTextureSize / m_tilesize) >> i;
bx::debugPrintf("Generating Mip:%d Count:%dx%d\n", i, count, count);
for (int y = 0; y < count; ++y)
{
for (int x = 0; x < count; ++x)
{
Page page = { x, y, i };
int index = m_indexer->getIndexFromPage(page);
CopyTile(*m_page1Image, page);
m_tileDataFile->writePage(index, &m_page1Image->m_data[0]);
}
}
}
bx::debugPrintf("Finising\n");
// Write header
m_tileDataFile->writeInfo();
// Close tile file
bx::deleteObject(VirtualTexture::getAllocator(), m_tileDataFile);
m_tileDataFile = nullptr;
bx::debugPrintf("Done!\n");
return true;
}
void TileGenerator::CopyTile(SimpleImage& image, Page request)
{
if (request.m_mip == 0)
{
int x = request.m_x * m_tilesize - m_info->m_borderSize;
int y = request.m_y * m_tilesize - m_info->m_borderSize;
// Copy sub-image with border
auto srcPitch = m_sourceImage->m_width * s_channelCount;
auto src = (uint8_t*)m_sourceImage->m_data;
auto dstPitch = image.m_width * image.m_channelCount;
auto dst = &image.m_data[0];
for (int iy = 0; iy < m_pagesize; ++iy)
{
int ry = bx::clamp(y + iy, 0, (int)m_sourceImage->m_height - 1);
for (int ix = 0; ix < m_pagesize; ++ix)
{
int rx = bx::clamp(x + ix, 0, (int)m_sourceImage->m_width - 1);
bx::memCopy(&dst[iy * dstPitch + ix * image.m_channelCount], &src[ry * srcPitch + rx * s_channelCount], image.m_channelCount);
}
}
}
else
{
int xpos = request.m_x << 1;
int ypos = request.m_y << 1;
int mip = request.m_mip - 1;
int size = m_info->GetPageTableSize() >> mip;
m_4xtileImage->clear((uint8_t)request.m_mip);
for (int y = 0; y < 4; ++y)
{
for (int x = 0; x < 4; ++x)
{
Page page = { xpos + x - 1, ypos + y - 1, mip };
// Wrap so we get the border sections of other pages
page.m_x = (int)bx::mod((float)page.m_x, (float)size);
page.m_y = (int)bx::mod((float)page.m_y, (float)size);
m_tileDataFile->readPage(m_indexer->getIndexFromPage(page), &m_page2Image->m_data[0]);
Rect src_rect = { m_info->m_borderSize, m_info->m_borderSize, m_tilesize, m_tilesize };
Point dst_offset = { x * m_tilesize, y * m_tilesize };
m_4xtileImage->copy(dst_offset, *m_page2Image, src_rect);
}
}
SimpleImage::mipmap(&m_4xtileImage->m_data[0], m_4xtileImage->m_width, s_channelCount, &m_2xtileImage->m_data[0]);
Rect srect = { m_tilesize / 2 - m_info->m_borderSize, m_tilesize / 2 - m_info->m_borderSize, m_pagesize, m_pagesize };
image.copy({ 0,0 }, *m_2xtileImage, srect);
}
}
} // namespace vt
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