PathNodeGL.hpp

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/*
   Copyright 2022 Rishi Challa
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
       http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
 
#pragma once
 
#ifdef KALE_OPENGL
 
#include <Kale/Core/Scene/Scene.hpp>
#include <Kale/Engine/Node/Node.hpp>
#include <Kale/Engine/StateAnimatable/StateAnimatable.hpp>
#include <Kale/Engine/SkeletalAnimatable/SkeletalAnimatable.hpp>
#include <Kale/Engine/Collidable/Collidable.hpp>
#include <Kale/Engine/Transformable/Transformable.hpp>
#include <Kale/Math/Path/Path.hpp>
#include <Kale/OpenGL/VertexArray/VertexArray.hpp>
#include <Kale/OpenGL/Shader/Shader.hpp>
 
#include <memory>
#include <optional>
#include <vector>
#include <array>
#include <utility>
 
#include <nlohmann/json.hpp>
 
namespace Kale {
 
    using JSON = nlohmann::json;
 
    class PathNode : public Node, public Transformable, public Collidable {
    public:
 
        enum class StrokeStyle {
            Neither = 0, Both = 1, Inside = 2, Outside = 3
        };
 
        struct BezierWeights {
            
            std::array<std::pair<int, float>, 4> startWeight;
            
            std::array<std::pair<int, float>, 4> controlPoint1Weight;
            
            std::array<std::pair<int, float>, 4> controlPoint2Weight;
            
            std::array<std::pair<int, float>, 4> endWeight;
        };
 
    private:
 
        std::unique_ptr<OpenGL::VertexArray<Vector2f, 2>> vertexArray;
 
        Path path;
 
        static inline std::unique_ptr<const OpenGL::Shader> shader = nullptr;
 
        inline static unsigned int cameraUniform, localUniform, vertexColorUniform, zPositionUniform,
            beziersUniform, numBeziersUniform, strokeUniform, fillUniform, strokeRadiusUniform, strokeColorUniform;
        
        inline static unsigned int posAttribute;
        
        static void setup();
 
        static void cleanup();
 
        void updateBoundingBox();
 
        friend class Application;
 
    protected:
 
        virtual void begin(const Scene& scene) override;
 
        virtual void preUpdate(size_t threadNum, const Scene& scene, float deltaTime) override;
 
        virtual void render(const Camera& camera, float deltaTime) const override;
 
        virtual void end(const Scene& scene) override;
 
    public:
 
        std::optional<StateAnimatable<Path>> pathFSM;
 
        std::shared_ptr<SkeletalAnimatable> skeletalAnimatable;
 
        std::optional<std::vector<BezierWeights>> skeletalWeights;
 
        std::optional<Path> basePath;
 
        float zPosition = 1.0f;
 
        bool fill = true;
 
        StrokeStyle stroke = StrokeStyle::Neither;
 
        float strokeRadius = 20.0f;
 
        Color color = Color(0x333333);
 
        Color strokeColor = Color(0x555555);
 
        PathNode();
 
        PathNode(const JSON& json);
 
        PathNode(const Path& path, bool fill = true, StrokeStyle stroke = StrokeStyle::Neither);
 
    };
}
 
#endif