text_modeler.h

// © Joseph Cameron - MIT License
 
#ifndef GDK_GRAPHICS_EXT_TEXT_MODELER_H
#define GDK_GRAPHICS_EXT_TEXT_MODELER_H
 
#include <gdk/graphics/context.h>
#include <gdk/graphics/ext/font.h>
#include <gdk/graphics/ext/font_texture.h>
#include <gdk/graphics/material.h>
#include <gdk/graphics/model_data.h>
#include <gdk/graphics/types.h>
 
#include <cstddef>
#include <memory>
#include <string>
#include <string_view>
 
namespace gdk::graphics::ext {
    class text_modeler final {
    public:
        [[nodiscard]] const_model_ptr_type model() const;

        [[nodiscard]] const_material_ptr_type material() const;

        void set_text(std::string_view aUTF8);

        void upload();

        [[nodiscard]] std::size_t uploaded_atlas_generation() const;

        [[nodiscard]] std::size_t fallback_glyph_count() const;

        [[nodiscard]] vector2_type size() const;

        text_modeler(
            context_ptr_type aContext,
            std::shared_ptr<font> aFont,
            material_ptr_type aMaterial = {},
            float aScale = 0.f
        );

        text_modeler(
            context_ptr_type aContext,
            std::shared_ptr<font_texture> aFontTexture,
            material_ptr_type aMaterial = {},
            float aScale = 0.f
        );
 
    private:
        void lay_out();
 
        std::shared_ptr<font> m_pFont;
 
        std::shared_ptr<font_texture> m_pFontTexture;
 
        texture_ptr_type m_pBoundTexture;
 
        material_ptr_type m_pMaterial;
 
        model_ptr_type m_pModel;
 
        std::string m_Text;
 
        model_data m_Layout;
 
        std::size_t m_LaidOutAtlasGeneration = 0;
 
        bool m_LayoutSent = false;
 
        std::size_t m_FallbackGlyphCount = 0;
 
        float m_Scale = 0;
 
        vector2_type m_Size = {0, 0};
    };
}
 
#endif