fps_camera.h

#include "camera.h"

class FPSCamera : public Camera {
public:
    FPSCamera(float fov, float width, float height) : Camera(fov, width, height) {
        up = glm::vec3(0.0f, 1.0f, 0.0f);
        yaw = -90.0f;
        pitch = 0.0f;
        onMouseMoved(0.0f, 0.0f);
        update();
    }

    void onMouseMoved(float xRel, float yRel) {
        yaw += xRel * mouseSensitivity;
        pitch -= yRel * mouseSensitivity;
        if(pitch > 89.0f)
            pitch = 89.0f;
        if(pitch < -89.0f)
            pitch = -89.0f;

        glm::vec3 front;
        front.x = cos(glm::radians(pitch)) * cos(glm::radians(yaw));
        front.y = sin(glm::radians(pitch));
        front.z = cos(glm::radians(pitch)) * sin(glm::radians(yaw));
        lookAt = glm::normalize(front);
        update();
    }

    void update() override {
        view = glm::lookAt(position, position+lookAt, up);
        viewProj = projection * view;
    }

    void moveFront(float amount) {
        translate(glm::normalize(glm::vec3(1.0f, 0.0f, 1.0f)*lookAt) * amount);
        update();
    }

    void moveSideways(float amount) {
        translate(glm::normalize(glm::cross(lookAt, up)) * amount);
        update();
    }

protected:
    float yaw;
    float pitch;
    glm::vec3 lookAt;
    const float mouseSensitivity = 0.3f;
    glm::vec3 up;
};