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#include "camera.h"
#include <glm/gtc/quaternion.hpp>
#include <GLFW/glfw3.h>
namespace Donut
{
Camera::Camera(float fov, float aspect_ratio, float near_plane, float far_plane)
: m_fov(fov), m_aspect_ratio(aspect_ratio), m_near_plane(near_plane), m_far_plane(far_plane)
{
recalculate_projection_matrix();
recalculate_view_matrix();
}
auto Camera::set_projection(float fov, float aspect_ratio, float near_plane, float far_plane) -> void
{
m_fov = fov;
m_aspect_ratio = aspect_ratio;
m_near_plane = near_plane;
m_far_plane = far_plane;
recalculate_projection_matrix();
}
auto Camera::recalculate_projection_matrix() -> void
{
m_projection_matrix = glm::perspective(glm::radians(m_fov), m_aspect_ratio, m_near_plane, m_far_plane);
m_view_projection_matrix = m_projection_matrix * m_view_matrix;
}
auto Camera::recalculate_view_matrix() -> void
{
if (m_camera_mode == CameraMode::FPS)
{
float pitch = glm::radians(m_rotation.x);
float yaw = glm::radians(m_rotation.y);
glm::vec3 direction;
direction.x = cos(yaw) * cos(pitch);
direction.y = sin(pitch);
direction.z = sin(yaw) * cos(pitch);
glm::vec3 world_up(0.0f, 1.0f, 0.0f);
glm::vec3 front = glm::normalize(direction);
glm::vec3 right = glm::normalize(glm::cross(front, world_up));
glm::vec3 up = glm::normalize(glm::cross(right, front));
m_view_matrix = glm::lookAt(m_position, m_position + front, up);
m_view_projection_matrix = m_projection_matrix * m_view_matrix;
}
else if (m_camera_mode == CameraMode::Orbital)
{
glm::vec3 position = get_orbital_position();
glm::vec3 target = m_orbital_target;
glm::vec3 up(0.0f, 1.0f, 0.0f);
m_view_matrix = glm::lookAt(position, target, up);
m_view_projection_matrix = m_projection_matrix * m_view_matrix;
}
}
auto Camera::get_forward_direction() const -> glm::vec3
{
float pitch = glm::radians(m_rotation.x);
float yaw = glm::radians(m_rotation.y);
glm::vec3 direction;
direction.x = cos(yaw) * cos(pitch);
direction.y = sin(pitch);
direction.z = sin(yaw) * cos(pitch);
return glm::normalize(direction);
}
auto Camera::get_right_direction() const -> glm::vec3
{
glm::vec3 world_up(0.0f, 1.0f, 0.0f);
return glm::normalize(glm::cross(get_forward_direction(), world_up));
}
auto Camera::get_up_direction() const -> glm::vec3
{
return glm::normalize(glm::cross(get_right_direction(), get_forward_direction()));
}
auto Camera::on_mouse_move(float x_offset, float y_offset, bool constrain_pitch) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
x_offset *= m_mouse_sensitivity;
y_offset *= m_mouse_sensitivity;
m_rotation.y += x_offset;
m_rotation.x += y_offset;
if (constrain_pitch)
{
if (m_rotation.x > 89.0f)
m_rotation.x = 89.0f;
if (m_rotation.x < -89.0f)
m_rotation.x = -89.0f;
}
recalculate_view_matrix();
}
}
auto Camera::move_forward(float delta_time) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
m_position += get_forward_direction() * m_movement_speed * delta_time;
recalculate_view_matrix();
}
}
auto Camera::move_backward(float delta_time) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
m_position -= get_forward_direction() * m_movement_speed * delta_time;
recalculate_view_matrix();
}
}
auto Camera::move_right(float delta_time) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
m_position += get_right_direction() * m_movement_speed * delta_time;
recalculate_view_matrix();
}
}
auto Camera::move_left(float delta_time) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
m_position -= get_right_direction() * m_movement_speed * delta_time;
recalculate_view_matrix();
}
}
auto Camera::move_up(float delta_time) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
glm::vec3 world_up(0.0f, 1.0f, 0.0f);
m_position += world_up * m_movement_speed * delta_time;
recalculate_view_matrix();
}
}
auto Camera::move_down(float delta_time) -> void
{
if (m_camera_mode == CameraMode::FPS)
{
glm::vec3 world_up(0.0f, 1.0f, 0.0f);
m_position -= world_up * m_movement_speed * delta_time;
recalculate_view_matrix();
}
}
auto Camera::get_orbital_position() const -> glm::vec3
{
float clamped_elevation = glm::clamp(m_elevation, 0.01f, float(std::numbers::pi) - 0.01f);
return glm::vec3
(
m_orbital_radius * sin(clamped_elevation) * cos(m_azimuth),
m_orbital_radius * cos(clamped_elevation),
m_orbital_radius * sin(clamped_elevation) * sin(m_azimuth)
);
}
auto Camera::update_orbital() -> void
{
m_orbital_target = glm::vec3(0.0f, 0.0f, 0.0f);
if (m_dragging || m_panning)
m_moving = true;
else
m_moving = false;
recalculate_view_matrix();
}
auto Camera::process_orbital_mouse_move(double x, double y) -> void
{
if (m_dragging && !m_panning)
{
float dx = float(x - m_last_x_orbital);
float dy = float(y - m_last_y_orbital);
m_azimuth += dx * m_orbital_speed;
m_elevation -= dy * m_orbital_speed;
m_elevation = glm::clamp(m_elevation, 0.01f, float(std::numbers::pi) - 0.01f);
}
m_last_x_orbital = x;
m_last_y_orbital = y;
update_orbital();
}
auto Camera::process_orbital_mouse_button(int button, int action, int /*mods*/) -> void
{
if (button == GLFW_MOUSE_BUTTON_LEFT)
{
if (action == GLFW_PRESS)
{
m_dragging = true;
m_panning = false;
}
else if (action == GLFW_RELEASE)
{
m_dragging = false;
m_panning = false;
}
}
}
auto Camera::process_orbital_scroll(double /*x_offset*/, double y_offset) -> void
{
m_orbital_radius -= y_offset * m_zoom_speed;
m_orbital_radius = glm::clamp(m_orbital_radius, m_orbital_min_radius, m_orbital_max_radius);
update_orbital();
}
}
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