05 Preparing an orthographic projection matrix.cpp

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// Vulkan Cookbook
// ISBN: 9781786468154
// © Packt Publishing Limited
//
// Author:   Pawel Lapinski
// LinkedIn: https://www.linkedin.com/in/pawel-lapinski-84522329
//
// Chapter: 10 Helper Recipes
// Recipe:  05 Preparing an orthographic projection matrix

#include "10 Helper Recipes/05 Preparing an orthographic projection matrix.h"

namespace VulkanCookbook {

  Matrix4x4 PrepareOrthographicProjectionMatrix( float left_plane,
                                                 float right_plane,
                                                 float bottom_plane,
                                                 float top_plane,
                                                 float near_plane,
                                                 float far_plane ) {
    Matrix4x4 orthographic_projection_matrix = {
      2.0f / (right_plane - left_plane),
      0.0f,
      0.0f,
      0.0f,

      0.0f,
      2.0f / (bottom_plane - top_plane),
      0.0f,
      0.0f,

      0.0f,
      0.0f,
      1.0f / (near_plane - far_plane),
      0.0f,

      -(right_plane + left_plane) / (right_plane - left_plane),
      -(bottom_plane + top_plane) / (bottom_plane - top_plane),
      near_plane / (near_plane - far_plane),
      1.0f
    };
    return orthographic_projection_matrix;
  }

} // namespace VulkanCookbook