cross_platform_game_engine/Camera.cpp at main · Hiqqup/cross_platform_game_engine · GitHub

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//
// Created by ju on 10/31/25.
//

#include "Camera.hpp"

#include "platform/GlfwWindow.hpp"

glm::vec2 Camera::getMousePosition(GLFWwindow* window) {
    double xPos, yPos;
    glfwGetCursorPos(window, &xPos, &yPos);
    return {xPos, yPos};
}

 glm::vec2 Camera::getDeltaMousePosition(GLFWwindow *window) {
    if (firstMousePos) {
        firstMousePos = false;
        mousePosition = getMousePosition(window);
        return {0,0};
    }
    auto newMousePosition = getMousePosition(window);
    glm::vec2 deltaMousePosition = mousePosition - newMousePosition;
    mousePosition = newMousePosition;
    return deltaMousePosition;
}
bool cursor_enabled = true;
void Camera::processInput( GlfwWindow& glfw_window) {
  	GLFWwindow* window = glfw_window.window;
   float cameraSpeed = 0.2f;
    if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
        cameraSpeed = 0.5f;
    if (glfwGetKey(window, GLFW_KEY_J) == GLFW_PRESS)
    	cursor_enabled = !cursor_enabled;
    	glfw_window.set_cursor_disabled(cursor_enabled);
    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
        position += glm::normalize(glm::vec3(front.x, 0, front.z) ) * cameraSpeed;
    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
        position -= glm::normalize(glm::vec3(front.x, 0, front.z) ) * cameraSpeed;
    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
        position -= glm::normalize(glm::cross(front, up)) * cameraSpeed;
    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
        position += glm::normalize(glm::cross(front, up)) * cameraSpeed;
    if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
        position.y  += cameraSpeed;
    if (glfwGetKey(window, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS)
        position.y  -= cameraSpeed;

    glm::vec2 mouseDelta = getDeltaMousePosition(window);
    float sensitivity = 0.02f;
    mouseDelta*= sensitivity;

    yaw   -= mouseDelta.x;
    pitch += mouseDelta.y;

    if(pitch > 89.0f)
        pitch = 89.0f;
    if(pitch < -89.0f)
        pitch = -89.0f;

    glm::vec3 direction;
    direction.x = static_cast<float>(cos(glm::radians(yaw)) * cos(glm::radians(pitch)));
    direction.y = static_cast<float>(sin(glm::radians(pitch)));
    direction.z = static_cast<float>(sin(glm::radians(yaw)) * cos(glm::radians(pitch)));
    front = glm::normalize(direction);

}