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			647 lines
		
	
	
	
		
			18 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			647 lines
		
	
	
	
		
			18 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| #include <scwx/qt/gl/draw/icons.hpp>
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| #include <scwx/qt/types/icon_types.hpp>
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| #include <scwx/qt/util/maplibre.hpp>
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| #include <scwx/qt/util/texture_atlas.hpp>
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| #include <scwx/qt/util/tooltip.hpp>
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| #include <scwx/util/logger.hpp>
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| 
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| #include <execution>
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| 
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| #include <boost/unordered/unordered_flat_map.hpp>
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| 
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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 gl
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| {
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| namespace draw
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| {
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| 
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| static const std::string logPrefix_ = "scwx::qt::gl::draw::icons";
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| static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
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| 
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| static constexpr std::size_t kNumRectangles        = 1;
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| static constexpr std::size_t kNumTriangles         = kNumRectangles * 2;
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| static constexpr std::size_t kVerticesPerTriangle  = 3;
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| static constexpr std::size_t kVerticesPerRectangle = kVerticesPerTriangle * 2;
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| static constexpr std::size_t kPointsPerVertex      = 9;
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| static constexpr std::size_t kPointsPerTexCoord    = 3;
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| static constexpr std::size_t kIconBufferLength =
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|    kNumTriangles * kVerticesPerTriangle * kPointsPerVertex;
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| static constexpr std::size_t kTextureBufferLength =
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|    kNumTriangles * kVerticesPerTriangle * kPointsPerTexCoord;
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| 
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| struct IconDrawItem : types::EventHandler
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| {
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|    boost::gil::rgba32f_pixel_t modulate_ {1.0f, 1.0f, 1.0f, 1.0f};
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|    double                      x_ {};
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|    double                      y_ {};
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|    units::degrees<double>      angle_ {};
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|    std::string                 iconSheet_ {};
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|    std::size_t                 iconIndex_ {};
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|    std::string                 hoverText_ {};
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| };
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| 
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| class Icons::Impl
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| {
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| public:
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|    struct IconHoverEntry
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|    {
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|       std::shared_ptr<IconDrawItem> di_;
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| 
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|       glm::vec2 otl_;
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|       glm::vec2 otr_;
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|       glm::vec2 obl_;
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|       glm::vec2 obr_;
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|    };
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| 
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|    explicit Impl(const std::shared_ptr<GlContext>& context) :
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|        context_ {context},
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|        shaderProgram_ {nullptr},
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|        uMVPMatrixLocation_(GL_INVALID_INDEX),
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|        vao_ {GL_INVALID_INDEX},
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|        vbo_ {GL_INVALID_INDEX},
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|        numVertices_ {0}
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|    {
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|    }
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| 
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|    ~Impl() {}
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| 
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|    void UpdateBuffers();
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|    void UpdateTextureBuffer();
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|    void Update(bool textureAtlasChanged);
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| 
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|    std::shared_ptr<GlContext> context_;
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| 
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|    bool visible_ {true};
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|    bool dirty_ {false};
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|    bool lastTextureAtlasChanged_ {false};
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| 
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|    std::mutex iconMutex_;
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| 
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|    boost::unordered_flat_map<std::string, types::IconInfo>
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|       currentIconSheets_ {};
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|    boost::unordered_flat_map<std::string, types::IconInfo> newIconSheets_ {};
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| 
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|    std::vector<std::shared_ptr<IconDrawItem>> currentIconList_ {};
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|    std::vector<std::shared_ptr<IconDrawItem>> newIconList_ {};
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|    std::vector<std::shared_ptr<IconDrawItem>> newValidIconList_ {};
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| 
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|    std::vector<float> currentIconBuffer_ {};
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|    std::vector<float> newIconBuffer_ {};
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| 
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|    std::vector<float> textureBuffer_ {};
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| 
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|    std::vector<IconHoverEntry> currentHoverIcons_ {};
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|    std::vector<IconHoverEntry> newHoverIcons_ {};
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| 
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|    std::shared_ptr<ShaderProgram> shaderProgram_;
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|    GLint                          uMVPMatrixLocation_;
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| 
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|    GLuint                vao_;
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|    std::array<GLuint, 2> vbo_;
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| 
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|    GLsizei numVertices_;
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| };
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| 
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| Icons::Icons(const std::shared_ptr<GlContext>& context) :
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|     DrawItem(context->gl()), p(std::make_unique<Impl>(context))
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| {
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| }
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| Icons::~Icons() = default;
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| 
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| Icons::Icons(Icons&&) noexcept            = default;
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| Icons& Icons::operator=(Icons&&) noexcept = default;
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| 
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| void Icons::Initialize()
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| {
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|    gl::OpenGLFunctions& gl = p->context_->gl();
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| 
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|    p->shaderProgram_ = p->context_->GetShaderProgram(
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|       {{GL_VERTEX_SHADER, ":/gl/texture2d_array.vert"},
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|        {GL_FRAGMENT_SHADER, ":/gl/texture2d_array.frag"}});
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| 
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|    p->uMVPMatrixLocation_ = p->shaderProgram_->GetUniformLocation("uMVPMatrix");
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| 
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|    gl.glGenVertexArrays(1, &p->vao_);
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|    gl.glGenBuffers(static_cast<GLsizei>(p->vbo_.size()), p->vbo_.data());
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| 
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|    gl.glBindVertexArray(p->vao_);
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|    gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_[0]);
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|    gl.glBufferData(GL_ARRAY_BUFFER, 0u, nullptr, GL_DYNAMIC_DRAW);
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| 
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|    // aVertex
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|    gl.glVertexAttribPointer(0,
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|                             2,
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|                             GL_FLOAT,
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|                             GL_FALSE,
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|                             kPointsPerVertex * sizeof(float),
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|                             reinterpret_cast<void*>(0));
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|    gl.glEnableVertexAttribArray(0);
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| 
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|    // aXYOffset
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|    gl.glVertexAttribPointer(1,
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|                             2,
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|                             GL_FLOAT,
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|                             GL_FALSE,
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|                             kPointsPerVertex * sizeof(float),
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|                             reinterpret_cast<void*>(2 * sizeof(float)));
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|    gl.glEnableVertexAttribArray(1);
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| 
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|    // aModulate
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|    gl.glVertexAttribPointer(3,
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|                             4,
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|                             GL_FLOAT,
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|                             GL_FALSE,
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|                             kPointsPerVertex * sizeof(float),
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|                             reinterpret_cast<void*>(4 * sizeof(float)));
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|    gl.glEnableVertexAttribArray(3);
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| 
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|    // aAngle
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|    gl.glVertexAttribPointer(4,
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|                             1,
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|                             GL_FLOAT,
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|                             GL_FALSE,
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|                             kPointsPerVertex * sizeof(float),
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|                             reinterpret_cast<void*>(8 * sizeof(float)));
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|    gl.glEnableVertexAttribArray(4);
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| 
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|    gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_[1]);
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|    gl.glBufferData(GL_ARRAY_BUFFER, 0u, nullptr, GL_DYNAMIC_DRAW);
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| 
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|    // aTexCoord
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|    gl.glVertexAttribPointer(2,
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|                             3,
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|                             GL_FLOAT,
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|                             GL_FALSE,
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|                             kPointsPerTexCoord * sizeof(float),
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|                             static_cast<void*>(0));
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|    gl.glEnableVertexAttribArray(2);
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| 
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|    p->dirty_ = true;
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| }
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| 
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| void Icons::Render(const QMapLibreGL::CustomLayerRenderParameters& params,
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|                    bool textureAtlasChanged)
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| {
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|    if (!p->visible_)
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|    {
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|       if (textureAtlasChanged)
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|       {
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|          p->lastTextureAtlasChanged_ = true;
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|       }
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| 
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|       return;
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|    }
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| 
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|    std::unique_lock lock {p->iconMutex_};
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| 
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|    if (!p->currentIconList_.empty())
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|    {
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|       gl::OpenGLFunctions& gl = p->context_->gl();
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| 
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|       gl.glBindVertexArray(p->vao_);
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| 
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|       p->Update(textureAtlasChanged);
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|       p->shaderProgram_->Use();
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|       UseDefaultProjection(params, p->uMVPMatrixLocation_);
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| 
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|       // Interpolate texture coordinates
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|       gl.glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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|       gl.glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 
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|       // Draw icons
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|       gl.glDrawArrays(GL_TRIANGLES, 0, p->numVertices_);
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|    }
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| }
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| 
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| void Icons::Deinitialize()
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| {
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|    gl::OpenGLFunctions& gl = p->context_->gl();
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| 
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|    gl.glDeleteVertexArrays(1, &p->vao_);
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|    gl.glDeleteBuffers(static_cast<GLsizei>(p->vbo_.size()), p->vbo_.data());
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| 
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|    std::unique_lock lock {p->iconMutex_};
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| 
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|    p->currentIconList_.clear();
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|    p->currentIconSheets_.clear();
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|    p->currentHoverIcons_.clear();
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|    p->currentIconBuffer_.clear();
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|    p->textureBuffer_.clear();
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| }
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| 
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| void Icons::SetVisible(bool visible)
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| {
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|    p->visible_ = visible;
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| }
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| 
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| void Icons::StartIconSheets()
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| {
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|    // Clear the new buffer
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|    p->newIconSheets_.clear();
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| }
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| 
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| void Icons::AddIconSheet(const std::string& name,
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|                          std::size_t        iconWidth,
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|                          std::size_t        iconHeight,
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|                          std::int32_t       hotX,
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|                          std::int32_t       hotY)
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| {
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|    // Populate icon sheet map
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|    p->newIconSheets_.emplace(std::piecewise_construct,
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|                              std::tuple {name},
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|                              std::forward_as_tuple(types::IconInfo {
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|                                 name, iconWidth, iconHeight, hotX, hotY}));
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| }
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| 
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| void Icons::FinishIconSheets()
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| {
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|    // Update icon sheets
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|    for (auto& iconSheet : p->newIconSheets_)
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|    {
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|       iconSheet.second.UpdateTextureInfo();
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|    }
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| 
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|    std::unique_lock lock {p->iconMutex_};
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| 
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|    // Swap buffers
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|    p->currentIconSheets_.swap(p->newIconSheets_);
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| 
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|    // Clear the new buffers
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|    p->newIconSheets_.clear();
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| 
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|    // Mark the draw item dirty
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|    p->dirty_ = true;
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| }
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| 
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| void Icons::StartIcons()
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| {
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|    // Clear the new buffer
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|    p->newIconList_.clear();
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|    p->newValidIconList_.clear();
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|    p->newIconBuffer_.clear();
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|    p->newHoverIcons_.clear();
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| }
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| 
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| std::shared_ptr<IconDrawItem> Icons::AddIcon()
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| {
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|    return p->newIconList_.emplace_back(std::make_shared<IconDrawItem>());
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| }
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| 
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| void Icons::SetIconTexture(const std::shared_ptr<IconDrawItem>& di,
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|                            const std::string&                   iconSheet,
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|                            std::size_t                          iconIndex)
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| {
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|    di->iconSheet_ = iconSheet;
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|    di->iconIndex_ = iconIndex;
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| }
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| 
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| void Icons::SetIconLocation(const std::shared_ptr<IconDrawItem>& di,
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|                             double                               x,
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|                             double                               y)
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| {
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|    di->x_ = x;
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|    di->y_ = y;
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| }
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| 
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| void Icons::SetIconAngle(const std::shared_ptr<IconDrawItem>& di,
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|                          units::angle::degrees<double>        angle)
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| {
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|    di->angle_ = angle;
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| }
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| 
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| void Icons::SetIconModulate(const std::shared_ptr<IconDrawItem>& di,
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|                             boost::gil::rgba8_pixel_t            modulate)
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| {
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|    di->modulate_ = {modulate[0] / 255.0f,
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|                     modulate[1] / 255.0f,
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|                     modulate[2] / 255.0f,
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|                     modulate[3] / 255.0f};
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| }
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| 
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| void Icons::SetIconModulate(const std::shared_ptr<IconDrawItem>& di,
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|                             boost::gil::rgba32f_pixel_t          modulate)
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| {
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|    di->modulate_ = modulate;
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| }
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| 
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| void Icons::SetIconHoverText(const std::shared_ptr<IconDrawItem>& di,
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|                              const std::string&                   text)
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| {
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|    di->hoverText_ = text;
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| }
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| 
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| void Icons::FinishIcons()
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| {
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|    // Update buffers
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|    p->UpdateBuffers();
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| 
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|    std::unique_lock lock {p->iconMutex_};
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| 
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|    // Swap buffers
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|    p->currentIconList_.swap(p->newValidIconList_);
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|    p->currentIconBuffer_.swap(p->newIconBuffer_);
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|    p->currentHoverIcons_.swap(p->newHoverIcons_);
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| 
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|    // Clear the new buffers, except the full icon list (used to update buffers
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|    // without re-adding icons)
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|    p->newValidIconList_.clear();
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|    p->newIconBuffer_.clear();
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|    p->newHoverIcons_.clear();
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| 
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|    // Mark the draw item dirty
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|    p->dirty_ = true;
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| }
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| 
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| void Icons::Impl::UpdateBuffers()
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| {
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|    newIconBuffer_.clear();
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|    newIconBuffer_.reserve(newIconList_.size() * kIconBufferLength);
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|    newValidIconList_.clear();
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|    newHoverIcons_.clear();
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| 
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|    for (auto& di : newIconList_)
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|    {
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|       auto it = currentIconSheets_.find(di->iconSheet_);
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|       if (it == currentIconSheets_.cend())
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|       {
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|          // No icon sheet found
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|          logger_->warn("Could not find icon sheet: {}", di->iconSheet_);
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|          continue;
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|       }
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| 
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|       auto& icon = it->second;
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| 
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|       // Validate icon
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|       if (di->iconIndex_ >= icon.numIcons_)
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|       {
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|          // No icon found
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|          logger_->warn("Invalid icon index: {}", di->iconIndex_);
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|          continue;
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|       }
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| 
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|       // Icon is valid, add to valid icon list
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|       newValidIconList_.push_back(di);
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| 
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|       // Base X/Y offsets in pixels
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|       const float x = static_cast<float>(di->x_);
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|       const float y = static_cast<float>(di->y_);
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| 
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|       // Icon size
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|       const float iw = static_cast<float>(icon.iconWidth_);
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|       const float ih = static_cast<float>(icon.iconHeight_);
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| 
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|       // Hot X/Y (zero-based icon center)
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|       const float hx = static_cast<float>(icon.hotX_);
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|       const float hy = static_cast<float>(icon.hotY_);
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| 
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|       // Final X/Y offsets in pixels
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|       const float lx = std::roundf(-hx);
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|       const float rx = std::roundf(lx + iw);
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|       const float ty = std::roundf(+hy);
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|       const float by = std::roundf(ty - ih);
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| 
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|       // Angle in degrees
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|       units::angle::degrees<float> angle = di->angle_;
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|       const float                  a     = angle.value();
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| 
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|       // Modulate color
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|       const float mc0 = di->modulate_[0];
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|       const float mc1 = di->modulate_[1];
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|       const float mc2 = di->modulate_[2];
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|       const float mc3 = di->modulate_[3];
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| 
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|       newIconBuffer_.insert(newIconBuffer_.end(),
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|                             {
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|                                // Icon
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|                                x, y, lx, by, mc0, mc1, mc2, mc3, a, // BL
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|                                x, y, lx, ty, mc0, mc1, mc2, mc3, a, // TL
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|                                x, y, rx, by, mc0, mc1, mc2, mc3, a, // BR
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|                                x, y, rx, by, mc0, mc1, mc2, mc3, a, // BR
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|                                x, y, rx, ty, mc0, mc1, mc2, mc3, a, // TR
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|                                x, y, lx, ty, mc0, mc1, mc2, mc3, a  // TL
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|                             });
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| 
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|       if (!di->hoverText_.empty() || di->event_ != nullptr)
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|       {
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|          const units::angle::radians<double> radians = angle;
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| 
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|          const float cosAngle = cosf(static_cast<float>(radians.value()));
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|          const float sinAngle = sinf(static_cast<float>(radians.value()));
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| 
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|          const glm::mat2 rotate {cosAngle, -sinAngle, sinAngle, cosAngle};
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| 
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|          const glm::vec2 otl = rotate * glm::vec2 {lx, ty};
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|          const glm::vec2 otr = rotate * glm::vec2 {rx, ty};
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|          const glm::vec2 obl = rotate * glm::vec2 {lx, by};
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|          const glm::vec2 obr = rotate * glm::vec2 {rx, by};
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| 
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|          newHoverIcons_.emplace_back(IconHoverEntry {di, otl, otr, obl, obr});
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|       }
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|    }
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| }
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| 
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| void Icons::Impl::UpdateTextureBuffer()
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| {
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|    textureBuffer_.clear();
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|    textureBuffer_.reserve(currentIconList_.size() * kTextureBufferLength);
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| 
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|    for (auto& di : currentIconList_)
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|    {
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|       auto it = currentIconSheets_.find(di->iconSheet_);
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|       if (it == currentIconSheets_.cend())
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|       {
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|          // No file found. Should not get here, but insert empty data to match
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|          // up with data already buffered
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|          logger_->error("Could not find icon sheet: {}", di->iconSheet_);
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| 
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|          // clang-format off
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|          textureBuffer_.insert(
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|             textureBuffer_.end(),
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|             {
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|                // Icon
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|                0.0f, 0.0f, 0.0f, // BL
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|                0.0f, 0.0f, 0.0f, // TL
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|                0.0f, 0.0f, 0.0f, // BR
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|                0.0f, 0.0f, 0.0f, // BR
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|                0.0f, 0.0f, 0.0f, // TR
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|                0.0f, 0.0f, 0.0f  // TL
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|             });
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|          // clang-format on
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| 
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|          continue;
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|       }
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| 
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|       auto& icon = it->second;
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| 
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|       // Validate icon
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|       if (di->iconIndex_ >= icon.numIcons_)
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|       {
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|          // No icon found
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|          logger_->error("Invalid icon index: {}", di->iconIndex_);
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| 
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|          // Will get here if a texture changes, and the texture shrunk such that
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|          // the icon is no longer found
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| 
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|          // clang-format off
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|          textureBuffer_.insert(
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|             textureBuffer_.end(),
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|             {
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|                // Icon
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|                0.0f, 0.0f, 0.0f, // BL
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|                0.0f, 0.0f, 0.0f, // TL
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|                0.0f, 0.0f, 0.0f, // BR
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|                0.0f, 0.0f, 0.0f, // BR
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|                0.0f, 0.0f, 0.0f, // TR
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|                0.0f, 0.0f, 0.0f  // TL
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|             });
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|          // clang-format on
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| 
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|          continue;
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|       }
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| 
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|       // Texture coordinates
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|       const std::size_t iconRow    = (di->iconIndex_) / icon.columns_;
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|       const std::size_t iconColumn = (di->iconIndex_) % icon.columns_;
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| 
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|       const float iconX = iconColumn * icon.scaledWidth_;
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|       const float iconY = iconRow * icon.scaledHeight_;
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| 
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|       const float ls = icon.texture_.sLeft_ + iconX;
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|       const float rs = ls + icon.scaledWidth_;
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|       const float tt = icon.texture_.tTop_ + iconY;
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|       const float bt = tt + icon.scaledHeight_;
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|       const float r  = static_cast<float>(icon.texture_.layerId_);
 | |
| 
 | |
|       // clang-format off
 | |
|       textureBuffer_.insert(
 | |
|          textureBuffer_.end(),
 | |
|          {
 | |
|             // Icon
 | |
|             ls, bt, r, // BL
 | |
|             ls, tt, r, // TL
 | |
|             rs, bt, r, // BR
 | |
|             rs, bt, r, // BR
 | |
|             rs, tt, r, // TR
 | |
|             ls, tt, r  // TL
 | |
|          });
 | |
|       // clang-format on
 | |
|    }
 | |
| }
 | |
| 
 | |
| void Icons::Impl::Update(bool textureAtlasChanged)
 | |
| {
 | |
|    gl::OpenGLFunctions& gl = context_->gl();
 | |
| 
 | |
|    // If the texture atlas has changed
 | |
|    if (dirty_ || textureAtlasChanged || lastTextureAtlasChanged_)
 | |
|    {
 | |
|       // Update texture coordinates
 | |
|       for (auto& iconSheet : currentIconSheets_)
 | |
|       {
 | |
|          iconSheet.second.UpdateTextureInfo();
 | |
|       }
 | |
| 
 | |
|       // Update OpenGL texture buffer data
 | |
|       UpdateTextureBuffer();
 | |
| 
 | |
|       // Buffer texture data
 | |
|       gl.glBindBuffer(GL_ARRAY_BUFFER, vbo_[1]);
 | |
|       gl.glBufferData(GL_ARRAY_BUFFER,
 | |
|                       sizeof(float) * textureBuffer_.size(),
 | |
|                       textureBuffer_.data(),
 | |
|                       GL_DYNAMIC_DRAW);
 | |
| 
 | |
|       lastTextureAtlasChanged_ = false;
 | |
|    }
 | |
| 
 | |
|    // If buffers need updating
 | |
|    if (dirty_)
 | |
|    {
 | |
|       // Buffer vertex data
 | |
|       gl.glBindBuffer(GL_ARRAY_BUFFER, vbo_[0]);
 | |
|       gl.glBufferData(GL_ARRAY_BUFFER,
 | |
|                       sizeof(float) * currentIconBuffer_.size(),
 | |
|                       currentIconBuffer_.data(),
 | |
|                       GL_DYNAMIC_DRAW);
 | |
| 
 | |
|       numVertices_ =
 | |
|          static_cast<GLsizei>(currentIconBuffer_.size() / kPointsPerVertex);
 | |
|    }
 | |
| 
 | |
|    dirty_ = false;
 | |
| }
 | |
| 
 | |
| bool Icons::RunMousePicking(
 | |
|    const QMapLibreGL::CustomLayerRenderParameters& params,
 | |
|    const QPointF&                                  mouseLocalPos,
 | |
|    const QPointF&                                  mouseGlobalPos,
 | |
|    const glm::vec2& /* mouseCoords */,
 | |
|    const common::Coordinate& /* mouseGeoCoords */,
 | |
|    std::shared_ptr<types::EventHandler>& eventHandler)
 | |
| {
 | |
|    std::unique_lock lock {p->iconMutex_};
 | |
| 
 | |
|    bool itemPicked = false;
 | |
| 
 | |
|    // Convert local coordinates to icon coordinates
 | |
|    glm::vec2 mouseLocalCoords {mouseLocalPos.x(),
 | |
|                                params.height - mouseLocalPos.y()};
 | |
| 
 | |
|    // For each pickable icon
 | |
|    auto it = std::find_if( //
 | |
|       std::execution::par_unseq,
 | |
|       p->currentHoverIcons_.crbegin(),
 | |
|       p->currentHoverIcons_.crend(),
 | |
|       [&mouseLocalCoords](const auto& icon)
 | |
|       {
 | |
|          // Initialize vertices
 | |
|          glm::vec2 bl = {static_cast<float>(icon.di_->x_),
 | |
|                          static_cast<float>(icon.di_->y_)};
 | |
|          glm::vec2 br = bl;
 | |
|          glm::vec2 tl = br;
 | |
|          glm::vec2 tr = tl;
 | |
| 
 | |
|          // Offset vertices
 | |
|          tl += icon.otl_;
 | |
|          bl += icon.obl_;
 | |
|          br += icon.obr_;
 | |
|          tr += icon.otr_;
 | |
| 
 | |
|          // Test point against polygon bounds
 | |
|          return util::maplibre::IsPointInPolygon({tl, bl, br, tr},
 | |
|                                                  mouseLocalCoords);
 | |
|       });
 | |
| 
 | |
|    if (it != p->currentHoverIcons_.crend())
 | |
|    {
 | |
|       itemPicked = true;
 | |
| 
 | |
|       if (!it->di_->hoverText_.empty())
 | |
|       {
 | |
|          // Show tooltip
 | |
|          util::tooltip::Show(it->di_->hoverText_, mouseGlobalPos);
 | |
|       }
 | |
|       if (it->di_->event_ != nullptr)
 | |
|       {
 | |
|          // Register event handler
 | |
|          eventHandler = it->di_;
 | |
|       }
 | |
|    }
 | |
| 
 | |
|    return itemPicked;
 | |
| }
 | |
| 
 | |
| void Icons::RegisterEventHandler(
 | |
|    const std::shared_ptr<IconDrawItem>& di,
 | |
|    const std::function<void(QEvent*)>&  eventHandler)
 | |
| {
 | |
|    di->event_ = eventHandler;
 | |
| }
 | |
| 
 | |
| } // namespace draw
 | |
| } // namespace gl
 | |
| } // namespace qt
 | |
| } // namespace scwx
 | 
