BrushKernel.h

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#pragma once
#include "common/Export.h"
 
 
#include "editor/EditorTarget.h"
 
#include <vector>
 
namespace eve::editor {
 
struct BrushSample {
    float centerX = 0.f;
    float centerY = 0.f;
    float radius = 0.5f;
    float rotation = 0.f;
};
 
struct BrushPoint {
    int x = 0;
    int y = 0;
    float weight = 0.f;
};
 
class IBrushSampleSink {
public:
    virtual ~IBrushSampleSink() = default;
    virtual void emit(int x, int y, float weight) = 0;
};
 
class IBrushFalloff {
public:
    virtual ~IBrushFalloff() = default;
    virtual float evaluate(float normalizedDistance) const = 0;
};
 
class EVENGINE_API_ORCHESTRATION ConstantBrushFalloff final : public IBrushFalloff {
public:
    float evaluate(float normalizedDistance) const override;
};
 
class EVENGINE_API_ORCHESTRATION LinearBrushFalloff final : public IBrushFalloff {
public:
    float evaluate(float normalizedDistance) const override;
};
 
class SmoothBrushFalloff final : public IBrushFalloff {
public:
    float evaluate(float normalizedDistance) const override;
};
 
class IBrushKernel {
public:
    virtual ~IBrushKernel() = default;
    virtual EditRegion bounds(const BrushSample &sample) const = 0;
    virtual void sample(const BrushSample &sample, IBrushSampleSink &sink) const = 0;
};
 
class EVENGINE_API_ORCHESTRATION CircleBrushKernel final : public IBrushKernel {
public:
    explicit CircleBrushKernel(const IBrushFalloff *falloff = nullptr);
    void setFalloff(const IBrushFalloff *falloff) { falloff_ = falloff; }
    EditRegion bounds(const BrushSample &sample) const override;
    void sample(const BrushSample &sample, IBrushSampleSink &sink) const override;
private:
    const IBrushFalloff *falloff_ = nullptr;
};
 
class EVENGINE_API_ORCHESTRATION BoxBrushKernel final : public IBrushKernel {
public:
    explicit BoxBrushKernel(const IBrushFalloff *falloff = nullptr);
    void setFalloff(const IBrushFalloff *falloff) { falloff_ = falloff; }
    EditRegion bounds(const BrushSample &sample) const override;
    void sample(const BrushSample &sample, IBrushSampleSink &sink) const override;
private:
    const IBrushFalloff *falloff_ = nullptr;
};
 
class EVENGINE_API_ORCHESTRATION BrushSampleBuffer final : public IBrushSampleSink {
public:
    void emit(int x, int y, float weight) override;
    void clear() { points_.clear(); }
    int size() const { return static_cast<int>(points_.size()); }
    const BrushPoint &point(int index) const;
private:
    std::vector<BrushPoint> points_;
};
 
}  // namespace eve::editor