mirror of
https://github.com/ciphervance/supercell-wx.git
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290 lines
8.4 KiB
C++
290 lines
8.4 KiB
C++
#include <scwx/qt/util/texture_atlas.hpp>
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#include <scwx/qt/util/streams.hpp>
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#include <scwx/util/logger.hpp>
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#include <shared_mutex>
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#include <unordered_map>
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#pragma warning(push, 0)
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#pragma warning(disable : 4714)
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#include <boost/gil/extension/io/png.hpp>
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#include <boost/iostreams/stream.hpp>
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#include <stb_rect_pack.h>
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#include <QFile>
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#pragma warning(pop)
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namespace scwx
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{
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namespace qt
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{
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namespace util
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{
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static const std::string logPrefix_ = "scwx::qt::util::texture_atlas";
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static const auto logger_ = scwx::util::Logger::Create(logPrefix_);
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class TextureAtlas::Impl
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{
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public:
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explicit Impl() :
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texturePathMap_ {},
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texturePathMutex_ {},
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atlas_ {},
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atlasMap_ {},
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atlasMutex_ {}
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{
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}
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~Impl() {}
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static boost::gil::rgba8_image_t LoadImage(const std::string& imagePath);
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std::unordered_map<std::string, std::string> texturePathMap_;
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std::shared_mutex texturePathMutex_;
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boost::gil::rgba8_image_t atlas_;
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std::unordered_map<std::string, TextureAttributes> atlasMap_;
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std::shared_mutex atlasMutex_;
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};
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TextureAtlas::TextureAtlas() : p(std::make_unique<Impl>()) {}
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TextureAtlas::~TextureAtlas() = default;
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TextureAtlas::TextureAtlas(TextureAtlas&&) noexcept = default;
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TextureAtlas& TextureAtlas::operator=(TextureAtlas&&) noexcept = default;
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void TextureAtlas::RegisterTexture(const std::string& name,
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const std::string& path)
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{
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std::unique_lock lock(p->texturePathMutex_);
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p->texturePathMap_.insert_or_assign(name, path);
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}
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void TextureAtlas::BuildAtlas(size_t width, size_t height)
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{
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logger_->debug("Building {}x{} texture atlas", width, height);
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if (width > INT_MAX || height > INT_MAX)
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{
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logger_->error("Cannot build texture atlas of size {}x{}", width, height);
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return;
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}
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std::vector<std::pair<std::string, boost::gil::rgba8_image_t>> images;
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std::vector<stbrp_rect> stbrpRects;
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// Load images
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{
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// Take a read lock on the texture path map
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std::shared_lock lock(p->texturePathMutex_);
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// For each registered texture
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std::for_each(p->texturePathMap_.cbegin(),
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p->texturePathMap_.cend(),
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[&](const auto& pair)
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{
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// Load texture image
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boost::gil::rgba8_image_t image =
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Impl::LoadImage(pair.second);
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if (image.width() > 0u && image.height() > 0u)
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{
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// Store STB rectangle pack data in a vector
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stbrpRects.push_back(stbrp_rect {
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0,
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static_cast<stbrp_coord>(image.width()),
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static_cast<stbrp_coord>(image.height()),
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0,
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0,
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0});
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// Store image data in a vector
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images.emplace_back(pair.first, std::move(image));
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}
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});
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}
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// Pack images
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{
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logger_->trace("Packing {} images", images.size());
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// Optimal number of nodes = width
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stbrp_context stbrpContext;
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std::vector<stbrp_node> stbrpNodes(width);
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stbrp_init_target(&stbrpContext,
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static_cast<int>(width),
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static_cast<int>(height),
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stbrpNodes.data(),
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static_cast<int>(stbrpNodes.size()));
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// Pack loaded textures
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stbrp_pack_rects(
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&stbrpContext, stbrpRects.data(), static_cast<int>(stbrpRects.size()));
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}
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// Lock atlas
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std::unique_lock lock(p->atlasMutex_);
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// Clear index
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p->atlasMap_.clear();
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// Clear atlas
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p->atlas_.recreate(width, height);
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boost::gil::rgba8_view_t atlasView = boost::gil::view(p->atlas_);
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// Populate atlas
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logger_->trace("Populating atlas");
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const float xStep = 1.0f / width;
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const float yStep = 1.0f / height;
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const float xMin = xStep * 0.5f;
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const float yMin = yStep * 0.5f;
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for (size_t i = 0; i < images.size(); i++)
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{
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// If the image was packed successfully
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if (stbrpRects[i].was_packed != 0)
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{
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// Populate the atlas
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boost::gil::rgba8c_view_t imageView =
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boost::gil::const_view(images[i].second);
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boost::gil::rgba8_view_t atlasSubView =
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boost::gil::subimage_view(atlasView,
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stbrpRects[i].x,
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stbrpRects[i].y,
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imageView.width(),
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imageView.height());
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boost::gil::copy_pixels(imageView, atlasSubView);
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// Add texture image to the index
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const stbrp_coord x = stbrpRects[i].x;
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const stbrp_coord y = stbrpRects[i].y;
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const float sLeft = x * xStep + xMin;
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const float sRight =
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sLeft + static_cast<float>(imageView.width() - 1) / width;
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const float tTop = y * yStep + yMin;
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const float tBottom =
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tTop + static_cast<float>(imageView.height() - 1) / height;
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p->atlasMap_.emplace(
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std::piecewise_construct,
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std::forward_as_tuple(images[i].first),
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std::forward_as_tuple(
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boost::gil::point_t {x, y},
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boost::gil::point_t {imageView.width(), imageView.height()},
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sLeft,
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sRight,
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tTop,
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tBottom));
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}
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else
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{
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logger_->warn("Unable to pack texture: {}", images[i].first);
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}
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}
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}
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GLuint TextureAtlas::BufferAtlas(gl::OpenGLFunctions& gl)
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{
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GLuint texture = GL_INVALID_INDEX;
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std::shared_lock lock(p->atlasMutex_);
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if (p->atlas_.width() > 0u && p->atlas_.height() > 0u)
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{
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boost::gil::rgba8_view_t view = boost::gil::view(p->atlas_);
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std::vector<boost::gil::rgba8_pixel_t> pixelData(view.width() *
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view.height());
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boost::gil::copy_pixels(
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view,
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boost::gil::interleaved_view(view.width(),
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view.height(),
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pixelData.data(),
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view.width() *
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sizeof(boost::gil::rgba8_pixel_t)));
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lock.unlock();
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gl.glGenTextures(1, &texture);
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gl.glBindTexture(GL_TEXTURE_2D, texture);
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gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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gl.glTexImage2D(GL_TEXTURE_2D,
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0,
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GL_RGBA,
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view.width(),
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view.height(),
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0,
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GL_RGBA,
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GL_UNSIGNED_BYTE,
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pixelData.data());
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}
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return texture;
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}
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TextureAttributes TextureAtlas::GetTextureAttributes(const std::string& name)
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{
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TextureAttributes attr {};
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std::shared_lock lock(p->atlasMutex_);
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const auto& it = p->atlasMap_.find(name);
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if (it != p->atlasMap_.cend())
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{
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attr = it->second;
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}
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return attr;
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}
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boost::gil::rgba8_image_t
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TextureAtlas::Impl::LoadImage(const std::string& imagePath)
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{
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logger_->debug("Loading image: {}", imagePath);
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boost::gil::rgba8_image_t image;
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QFile imageFile(imagePath.c_str());
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imageFile.open(QIODevice::ReadOnly);
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if (!imageFile.isOpen())
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{
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logger_->error("Could not open image: {}", imagePath);
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return std::move(image);
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}
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boost::iostreams::stream<util::IoDeviceSource> dataStream(imageFile);
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boost::gil::image<boost::gil::rgba8_pixel_t, false> x;
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try
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{
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boost::gil::read_and_convert_image(
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dataStream, image, boost::gil::png_tag());
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}
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catch (const std::exception& ex)
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{
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logger_->error("Error reading image: {}", ex.what());
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return std::move(image);
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}
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return std::move(image);
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}
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TextureAtlas& TextureAtlas::Instance()
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{
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static TextureAtlas instance_ {};
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return instance_;
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}
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} // namespace util
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} // namespace qt
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} // namespace scwx
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