VolumeDensityGraph.h

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#pragma once
#include "common/Export.h"
 
 
#include <cstdint>
#include <vector>
 
#include <glm/vec3.hpp>
#include <glm/vec4.hpp>
 
namespace eve::graphics {
 
class EVENGINE_API_BACKENDS VolumeDensityGraph {
public:
    enum class Op { constant, height, sphere, box, noise, add, multiply, subtract, clamp };
 
    struct Node {
        Op op = Op::constant;
        int inputA = -1;
        int inputB = -1;
        glm::vec4 params{0.f};
    };
 
    void clear();
    int addNode(Op op, int inputA = -1, int inputB = -1,
                const glm::vec4 &params = glm::vec4(0.f));
    void setOutput(int nodeIndex);
    int getOutput() const { return output_; }
    int getNodeCount() const { return int(nodes_.size()); }
 
    float evaluate(const glm::vec3 &worldPosition, float time = 0.f) const;
 
private:
    static float valueNoise(const glm::vec3 &p, std::uint32_t seed);
 
    std::vector<Node> nodes_;
    int output_ = -1;
};
 
}  // namespace eve::graphics