Vulkan Projection Matrix from OpenGL Projection Matrix (C++ with glm)

projection.cpp

// Public domain.
#include <glm/mat4x4.hpp>
#include <glm/gtc/matrix_transform.hpp>

  /*
	Adjustment matrix, that transforms coordinates from OpenGL NDC to Vulkan NDC.
	*/
	inline glm::mat4 gl2vk_matrix()
	{
		/*
		( 1  0  0  0 )
		( 0 -1  0  0 )
		( 0  0 .5 .5 )
		( 0  0  0  1 )
		To create a Vulkan projection matrix Q from an OpenGL projection matrix P
		compute Q = P * A
		where A is the matrix above!
		*/
		glm::mat4 identity(1);
		identity[1][1] = -1;
		identity[2][2] = 0.5;
		identity[3][2] = 0.5;
		return identity;
	}
	inline glm::mat4 infinitePerspectiveVK(float aspect)
	{
		return gl2vk_matrix() * glm::infinitePerspective(glm::radians(90.0f),aspect,.1f);
	}
	inline glm::mat4 perspectiveVK(float aspect)
	{
		return gl2vk_matrix() * glm::perspective(glm::radians(90.0f),aspect,.1f, 1000.f);
	}