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camera.cpp
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camera.cpp
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#include "camera.hpp"
#include <GLFW/glfw3.h>
#include <imgui.h>
namespace ice {
Camera::Camera(CameraDimensions dim, glm::vec3 position)
: camera_matrix{},
position(position),
DEFAULT_POSITION(position),
width(dim.width),
height(dim.height) {}
CameraMatrices Camera::get_camera_matrix() const { return camera_matrix; }
CameraVectors Camera::get_camera_vector() const { return camera_vector; }
void Camera::update_matrices(float FOV_deg, float near_plane, float far_plane) {
camera_matrix.view = glm::lookAt(position, position + orientation, up);
camera_matrix.projection =
glm::perspective(glm::radians(FOV_deg),
static_cast<float>(width) / static_cast<float>(height),
near_plane, far_plane);
// correct to Vulkan coordinate system
camera_matrix.projection[1][1] *= -1;
camera_matrix.view_projection = camera_matrix.projection * camera_matrix.view;
}
void Camera::inputs(IceWindow *ice_window) {
GLFWwindow *window = ice_window->get_window();
// Check if ImGui wants to capture the mouse
if (ImGui::GetIO().WantCaptureMouse) {
camera_active = false;
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
return;
}
// Handles key inputs
if (glfwGetKey(window, GLFW_KEY_O) == GLFW_PRESS) {
// Resets to origin
position = DEFAULT_POSITION;
orientation = glm::vec3(2.0f, 1.0f, 0.0f);
up = {0.0f, 0.0f, 1.0f};
speed = default_speed = 0.005f;
sensitivity = 5.0f;
}
if (glfwGetKey(window, GLFW_KEY_X) == GLFW_PRESS) {
// increase speed and sensitivity
default_speed += 0.01f;
sensitivity += 0.50f;
}
if (glfwGetKey(window, GLFW_KEY_Z) == GLFW_PRESS) {
// decrease speed and sensitivity
default_speed = std::max(default_speed - 0.01f, 0.0f);
sensitivity = std::max(sensitivity - 0.50f, 0.0f);
}
if (glfwGetKey(window, GLFW_KEY_R) == GLFW_PRESS) {
// reset speed and sensitivity
speed = default_speed = 0.005f;
sensitivity = 5.0f;
}
#ifndef NDEBUG
if (glfwGetKey(window, GLFW_KEY_F12) == GLFW_PRESS) {
glfwWaitEvents();
if (glfwGetKey(window, GLFW_KEY_F12) == GLFW_RELEASE) {
// Dump values to console
std::cout << std::format(
"\n\nCamera Data:\n"
"Position:\n{}\n"
"Orientation:\n{}\n"
"Speed:\n{}\n"
"Sensitivity:\n{}\n"
"++++++++++++++\n"
"Camera Matrix:\n"
"++++++++++++++\n"
"view:\n{}\n"
"projection:\n{}\n"
"view-projection:\n{}\n",
glm::to_string(position), glm::to_string(orientation),
speed, sensitivity, glm::to_string(camera_matrix.view),
glm::to_string(camera_matrix.projection),
glm::to_string(camera_matrix.projection))
<< std::endl;
}
}
#endif
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS ||
glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS) {
position += speed * orientation;
}
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS ||
glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS) {
position += speed * -glm::normalize(glm::cross(orientation, up));
}
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS ||
glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS) {
position += speed * -orientation;
}
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS ||
glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS) {
position += speed * glm::normalize(glm::cross(orientation, up));
}
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS) {
position += speed * up;
}
if (glfwGetKey(window, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS) {
position += speed * -up;
}
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS) {
speed = 0.02f;
} else if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_RELEASE) {
speed = default_speed;
}
// Handles mouse inputs
if (glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS) {
if (!camera_active) {
camera_active = true;
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
}
// Prevents camera from jumping on the first click
if (first_click) {
glfwSetCursorPos(window, static_cast<float>(width) / 2.0f,
static_cast<float>(height) / 2.0f); // middle of screen
first_click = false;
}
double mouse_x{0.0}, mouse_y{0.0};
glfwGetCursorPos(window, &mouse_x, &mouse_y);
// Normalizes and shifts the coordinates of the cursor such that they begin
// in the middle of the screen and then "transforms" them into degrees
const float rot_x =
sensitivity *
static_cast<float>(mouse_y - (static_cast<float>(height) / 2)) /
static_cast<float>(height);
const float rot_y =
sensitivity *
static_cast<float>(mouse_x - (static_cast<float>(width) / 2)) /
static_cast<float>(width);
// Calculates upcoming vertical change in the orientation
orientation = glm::rotate(orientation, glm::radians(-rot_x),
glm::normalize(glm::cross(orientation, up)));
// Rotates the orientation left and right
orientation = glm::rotate(orientation, glm::radians(-rot_y), up);
glfwSetCursorPos(window, static_cast<float>(width) / 2.0f,
static_cast<float>(height) / 2.0f);
} else if (glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) ==
GLFW_RELEASE) {
if (camera_active) {
camera_active = false;
glfwSetInputMode(window, GLFW_CURSOR,
GLFW_CURSOR_NORMAL); // not looking anymore
}
// Makes sure the next time the camera looks around it doesn't jump
first_click = true;
}
}
} // namespace ice