nine_slice_panel.hpp

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#ifndef ZOAPPNINESLICE_H
#define ZOAPPNINESLICE_H
 
#include <SDL2/SDL.h>
#include <nlohmann/json.hpp>
#include <glm/glm.hpp>
 
#include "toymaker/engine/shader_program.hpp"
#include "toymaker/engine/core/resource_database.hpp"
#include "toymaker/engine/texture.hpp"
 
namespace ToyMaker{

    class NineSlicePanel: public ToyMaker::Resource<NineSlicePanel> {
    public:
        enum ScaleMode: uint8_t {
            STRETCH, //< UV coordinates remain within 0 and 1, even as the panel expands or contracts.
            TILE, //< UV coordinates for the resized panel are computed as multiples of the original pixel size of the panel's base texture.
        };

        NineSlicePanel(
            std::shared_ptr<ToyMaker::Texture> baseTexture,
            SDL_FRect contentRegionUV
        );

        ~NineSlicePanel();

        inline static std::string getResourceTypeName() { return "NineSlicePanel"; }

        std::shared_ptr<ToyMaker::Texture> generateTexture(glm::uvec2 contentDimensions) const;

        uint32_t getOffsetPixelLeft() const;

        uint32_t getOffsetPixelRight() const;

        uint32_t getOffsetPixelBottom() const;

        uint32_t getOffsetPixelTop() const;
 
    private:
        std::shared_ptr<ToyMaker::Texture> mTexture {};

        SDL_FRect mContentRegion { .x{0.f}, .y{0.f}, .w{1.f}, .h{1.f} };

        std::shared_ptr<ToyMaker::ShaderProgram> mShaderHandle { nullptr };

        GLuint mVertexArrayObject {};
    };

    class NineSlicePanelFromDescription: public ToyMaker::ResourceConstructor<NineSlicePanel, NineSlicePanelFromDescription> {
    public:
        NineSlicePanelFromDescription(): ToyMaker::ResourceConstructor<NineSlicePanel, NineSlicePanelFromDescription> {0} {}

        inline static std::string getResourceConstructorName() { return "fromDescription"; }
    private:
        std::shared_ptr<ToyMaker::IResource> createResource(const nlohmann::json& methodParameters) override;
    };

    NLOHMANN_JSON_SERIALIZE_ENUM(NineSlicePanel::ScaleMode, {
        {NineSlicePanel::ScaleMode::STRETCH, "stretch"},
        {NineSlicePanel::ScaleMode::TILE, "tile"},
    });
 
}
 
#endif