depth_convention.hpp

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#pragma once
 
#include <glm/ext/matrix_clip_space.hpp>
#include <glm/glm.hpp>
#include <vulkan/vulkan.hpp>
 
namespace renderer::depth {

inline constexpr bool k_reversed_z = true;
 
inline constexpr float k_near = k_reversed_z ? 1.0f : 0.0f;
inline constexpr float k_far = k_reversed_z ? 0.0f : 1.0f;
 
inline constexpr float k_clear = k_far;
 
inline constexpr vk::CompareOp k_closer = k_reversed_z ? vk::CompareOp::eGreater : vk::CompareOp::eLess;
inline constexpr vk::CompareOp k_closer_or_equal = k_reversed_z ? vk::CompareOp::eGreaterOrEqual : vk::CompareOp::eLessOrEqual;

[[nodiscard]]
inline auto perspective(float fovy, float aspect, float near_plane, float far_plane) -> glm::mat4 {
  // Swapping the planes maps near to 1 and far to 0
  return k_reversed_z ? glm::perspectiveRH_ZO(fovy, aspect, far_plane, near_plane)
                      : glm::perspectiveRH_ZO(fovy, aspect, near_plane, far_plane);
}
 
}