ray_march.hpp

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#pragma once
#include "gpu_layout.hpp"
 
#include <cstdint>
#include <glm/glm.hpp>
#include <toast/export.hpp>
 
namespace voxel {
 
inline constexpr uint32_t k_max_march_steps = 1024;

inline constexpr float k_march_tie_epsilon = 1e-6f;
 
struct RayHit {
  bool hit = false;

  float t = 0.0f;
 
  glm::ivec3 voxel {0};

  int32_t axis = -1;
 
  uint8_t material = k_empty_palette_index;
 
  uint32_t steps = 0;

  uint32_t coarse_steps = 0;
  uint32_t brick_steps = 0;
  uint32_t sub_steps = 0;
};

[[nodiscard]]
TOAST_API auto marchRay(
    const gpu::PackedPool& pool, const gpu::PackedScene& scene, uint32_t volume, glm::vec3 origin, glm::vec3 direction,
    float t_min, float t_max, uint32_t max_steps = k_max_march_steps
) -> RayHit;
 
}