Gradient.h

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#pragma once

#include <Eigen/Core>
#include <map>
#include <vector>

#include "open3d/visualization/rendering/RendererHandle.h"

namespace open3d {
namespace visualization {
namespace rendering {

class Renderer;

class Gradient {
public:
    struct Point {
        float value;
        Eigen::Vector4f color;
    };

    Gradient();
    Gradient(const std::vector<Gradient::Point>& points);
    virtual ~Gradient();

    const std::vector<Gradient::Point>& GetPoints() const;
    void SetPoints(const std::vector<Gradient::Point>& points);

    enum class Mode {
        kGradient,  
        kLUT        
    };

    Mode GetMode() const;
    void SetMode(Mode mode);

    TextureHandle GetTextureHandle(Renderer& renderer);

private:
    std::vector<Gradient::Point> points_;
    Mode mode_ = Mode::kGradient;
    std::map<Renderer*, TextureHandle> textures_;
};

}  // namespace rendering
}  // namespace visualization
}  // namespace open3d