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#pragma once
#include <array>
#include <filesystem>
#include <glm/glm.hpp>
#include <optional>
#include <span>
#include <utility>
#include <vector>
class Ray;
class GeoData {
public:
struct Node {
float height {-1.5F};
};
using Quad = std::array<glm::vec3, 4>;
using Limits = std::pair<glm::ivec2, glm::ivec2>;
explicit GeoData(Limits limit, float scale = 10.F);
void generateRandom();
void loadFromImages(const std::filesystem::path &, float scale);
[[nodiscard]] glm::vec3 positionAt(glm::vec2) const;
[[nodiscard]] std::optional<glm::vec3> intersectRay(const Ray &) const;
[[nodiscard]] unsigned int at(glm::ivec2) const;
[[nodiscard]] unsigned int at(int x, int y) const;
[[nodiscard]] Quad quad(glm::vec2) const;
[[nodiscard]] Limits getLimit() const;
[[nodiscard]] glm::uvec2 getSize() const;
[[nodiscard]] float getScale() const;
[[nodiscard]] std::span<const Node> getNodes() const;
class RayTracer {
public:
RayTracer(glm::vec2 p0, glm::vec2 p1);
glm::vec2 next();
private:
RayTracer(glm::vec2 p0, glm::vec2 p1, glm::vec2 d);
RayTracer(glm::vec2 p0, glm::vec2 d, std::pair<float, float>, std::pair<float, float>);
static std::pair<float, float> byAxis(glm::vec2 p0, glm::vec2 p1, glm::vec2 d, glm::length_t);
glm::vec2 p;
const glm::vec2 d;
float error;
glm::vec2 inc;
};
protected:
Limits limit {}; // Base grid limits first(x,y) -> second(x,y)
glm::uvec2 size {};
float scale {1};
std::vector<Node> nodes;
};
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