engine::graphics::Camera class
#include <include/engine/graphics/camera.h>

Simple 2D Camera that manages the Orthographic projection.

It manages three matrices internally:

  1. Projection Matrix: Maps world coordinates (e.g., 0 to 1920) to GPU space (-1 to 1). This defines your "Resolution" or "Aspect Ratio".
  2. View Matrix: Represents the Camera's position and rotation in the world. Moving the camera Right (+X) actually moves the View Matrix Left (-X).
  3. ViewProjection Matrix: The combination (Proj * View). This is what we send to the Shader to transform every vertex in one go.

Constructors, destructors, conversion operators

Camera(float left, float right, float bottom, float top)
Create a camera by defining the view boundaries.

Public functions

void set_projection(float left, float right, float bottom, float top)
Updates the boundaries (useful for window resizing).
void set_position(const glm::vec3& position)
Moves the camera in world space.
auto position() const -> const glm::vec3&
Gets the current position of the camera.
auto view_projection_matrix() const -> const glm::mat4&
Gets the cached view-projection matrix.

Function documentation

engine::graphics::Camera::Camera(float left, float right, float bottom, float top)

Create a camera by defining the view boundaries.

Parameters
left Left boundary.
right Right boundary.
bottom Bottom boundary.
top Top boundary.

Note: Flipping 'bottom' and 'top' determines if (0,0) is Top-Left or Bottom-Left.

void engine::graphics::Camera::set_projection(float left, float right, float bottom, float top)

Updates the boundaries (useful for window resizing).

Parameters
left Left boundary.
right Right boundary.
bottom Bottom boundary.
top Top boundary.

void engine::graphics::Camera::set_position(const glm::vec3& position)

Moves the camera in world space.

Parameters
position The new position.

const glm::vec3& engine::graphics::Camera::position() const

Gets the current position of the camera.

Returns The position.

const glm::mat4& engine::graphics::Camera::view_projection_matrix() const

Gets the cached view-projection matrix.

Returns The matrix.