SurfaceField.h

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#pragma once
#include "common/Export.h"
 
#include <glm/glm.hpp>
 
#include <vector>
 
namespace eve::gpuagents {
 
class EVENGINE_API_DOMAINS SurfaceField {
public:
    glm::vec3 origin{-16.f, 0.f, -16.f};
    float     worldSize = 32.f;
    int       resolution = 64;
 
    std::vector<float> height;
    std::vector<glm::vec3> normals;
    std::vector<glm::vec4> lifeField;
 
    void initFlat(const glm::vec3& originMin, float size, int res, float planeY = 0.f);
 
    glm::vec2 worldToUv(const glm::vec3& p) const;
 
    float sampleHeight(float x, float z) const;
 
    glm::vec3 sampleNormal(float x, float z) const;
 
    glm::vec4 sampleLife(float x, float z) const;
 
    glm::vec3 project(const glm::vec3& p) const;
 
    void stepLife(float dt, float decayRate, float halfLife, float diffusion,
                  const std::vector<glm::vec3>& deposits, float depositStrength);
 
private:
    int index(int x, int z) const;
    bool inBounds(int x, int z) const;
    glm::vec4 sampleLifeTexel(float u, float v) const;
};
 
}  // namespace eve::gpuagents