CloudShadow.h

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#pragma once
 
#include "procgen/texture/CloudField.h"
 
namespace eve::procgen {
 
class CloudShadow {
public:
    struct Params {
        CloudField field;               // the cloud field being shadowed
        float sunDirX = 0.f;            // normalized, toward the light (up)
        float sunDirY = 1.f;
        float sunDirZ = 0.f;
        float cloudAltitude = 60.f;     // cloud plane height above ground
        float strength     = 0.8f;      // 0..1 shadow darkness
    };
 
    CloudShadow() = default;
    explicit CloudShadow(const Params &params) { setParams(params); }
 
    const Params &params() const { return params_; }
    void          setParams(const Params &params);
 
    void setSunDirection(float x, float y, float z);
    void setCloudAltitude(float altitude);
    void setStrength(float strength);
 
    float coverageAt(float x, float z, float time) const;
 
    float shadowFactorAt(float x, float z, float time) const;
 
    void cloudOffset(float &ox, float &oz) const;
 
    void sampleCoverage(float *out, int width, int height, float time, float x0, float z0,
                        float extent) const;
 
    void sampleFactor(float *out, int width, int height, float time, float x0, float z0,
                      float extent) const;
 
private:
    Params params_;
};
 
}  // namespace eve::procgen