ClipSpace.h

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#pragma once
 
#include <glm/gtc/matrix_transform.hpp>
 
#include <algorithm>
 
namespace eve {
namespace graphics {
 
inline glm::mat4 perspectiveVulkanRH_ZO(float fovyRad, float aspect, float zNear, float zFar) {
    glm::mat4 p = glm::perspectiveRH_ZO(fovyRad, aspect, zNear, zFar);
    p[1][1] *= -1.f;
    return p;
}
 
inline glm::mat4 orthoVulkanRH_ZO(float left, float right, float bottom, float top, float zNear,
                                  float zFar) {
    glm::mat4 p = glm::orthoRH_ZO(left, right, bottom, top, zNear, zFar);
    p[1][1] *= -1.f;
    return p;
}
 
inline glm::mat4 cameraProjectionVulkanRH_ZO(bool orthographic, float fovyRad,
                                              float orthoHeight, float aspect,
                                              float zNear, float zFar) {
    if (!orthographic) return perspectiveVulkanRH_ZO(fovyRad, aspect, zNear, zFar);
    const float halfH = std::max(0.001f, orthoHeight * 0.5f);
    const float halfW = halfH * std::max(0.001f, aspect);
    return orthoVulkanRH_ZO(-halfW, halfW, -halfH, halfH, zNear, zFar);
}
 
}  // namespace graphics
}  // namespace eve