PerspectiveCamera.h

#pragma once
#include <SDL2/SDL.h>
#include "ICamera.h"
 
 
class PerspectiveCamera : public ICamera{
public:
    glm::vec3 panningAimPos{ 0,0,0 };
 
    float fov = 45.0f;
    float aspect = 0.0f;
    float nearPlane = 0.1f;
 
    PerspectiveCamera() : 
        _scale(1.0f)
    {
        eyePos = glm::vec3(0.f, 0.f, -770.0f);
        aimPos = glm::vec3(0.f, 0.f, 0.f);
    }
 
    ~PerspectiveCamera()
    {
 
    }
 
    void init() override {
        aspect = (float)_screenWidth / (float)_screenHeight;
        _projectionMatrix = glm::perspective(glm::radians(fov), aspect, nearPlane, zFar); //left, right, top, bottom
        updateCameraOrientation();
 
        _cameraMatrix = glm::mat4(1.0f);
 
        _cameraMatrix = _projectionMatrix * _viewMatrix;
 
    }
 
    void update() override {
        if (_cameraChange) {
            updateCameraOrientation();
 
            _cameraMatrix = glm::mat4(1.0f);
 
            _cameraMatrix = _projectionMatrix * _viewMatrix;
 
        }
        
    }
 
    glm::vec2 convertScreenToWorld(glm::vec2 screenCoords) const override {
        SDL_FRect cameraRect = getCameraRect();
 
        glm::vec2 worldCoords;
 
        worldCoords = screenCoords;
        worldCoords /= _scale;
 
        worldCoords.x = worldCoords.x + cameraRect.x;
        worldCoords.y = worldCoords.y + cameraRect.y;
 
 
        return worldCoords;
    }
 
    //setters
    void setPosition(const glm::vec3 newPosition) override {
        eyePos = newPosition;
        _cameraChange = true;
    }
 
    void setPosition_X(const float newPosition) override {
        eyePos.x = newPosition;
        _cameraChange = true;
    }
 
    void setPosition_Y(const float newPosition) override {
        eyePos.y = newPosition;
        _cameraChange = true;
    }
 
    void setPosition_Z(const float newPosition) override {
        eyePos.z = newPosition;
        _cameraChange = true;
    }
 
    void movePosition_Hor(const float step) {
        glm::vec3 direction = glm::normalize(aimPos - eyePos);  // Get movement direction
 
        // Calculate the right vector (perpendicular to direction and up)
        glm::vec3 right = glm::normalize(glm::cross(direction, upDir));
 
        // Move the camera horizontally along the right vector
        eyePos += right * step;
        aimPos += right * step;
        _cameraChange = true;
    }
    void movePosition_Vert(const float step) {
        glm::vec3 direction = glm::normalize(aimPos - eyePos);  // Get movement direction
 
        // Move the camera horizontally along the right vector
        eyePos += upDir * step;
        aimPos += upDir * step;
        _cameraChange = true;
    }
 
    void movePosition_Forward(const float step) {
        glm::vec3 direction = glm::normalize(aimPos - eyePos);
        eyePos += direction * step;
        aimPos += direction * step;
        _cameraChange = true;
    }
 
    void setAimPos(const glm::vec3 newAimPos) {
        aimPos = newAimPos;
        _cameraChange = true;
    }
 
    void moveAimPos(glm::vec3 startingAimPos, const glm::vec2 distance) {
        aimPos = startingAimPos;
        const float sensitivity = 0.005f;
 
        float yaw = distance.x * sensitivity;  
        float pitch = distance.y * sensitivity;
 
        glm::vec3 direction = glm::normalize(aimPos - eyePos);
 
        direction = glm::rotate(direction, yaw, upDir);
 
        glm::vec3 right = glm::normalize(glm::cross(direction, upDir));
 
        direction = glm::rotate(direction, pitch, right);
 
        // Update the aimPos based on the new direction
        aimPos = eyePos + direction;
        _cameraChange = true;
    }
 
    glm::vec3 getEulerAnglesFromDirection(glm::vec3 direction) {
        float yaw = glm::atan(direction.x, direction.z);
        float pitch = glm::asin(-direction.y);
        float roll = 0.0f;
 
        return glm::vec3(glm::degrees(pitch), glm::degrees(yaw), glm::degrees(roll));
    }
 
 
    float getZFar() {
        return zFar;
    }
 
    glm::vec3 getAimPos() override {
        return aimPos;
    }
 
    void setPanningAimPos(const glm::vec3 newAimPos) {
        panningAimPos = newAimPos;
    }
 
    glm::vec3 getPanningAimPos() {
        return panningAimPos;
    }
 
    void setScale(float newScale) override {
        _scale = newScale;
        _cameraChange = true;
    }
 
    //getters
    glm::vec3 getPosition() const override {
        return eyePos;
    }
 
    float getScale() const override {
        return _scale;
    }
 
    glm::mat4 getCameraMatrix() const override {
        return _cameraMatrix;
    }
 
    glm::ivec2 getCameraDimensions() const override {
        glm::vec2 cameraDimensions = { _screenWidth, _screenHeight };
        return cameraDimensions;
    }
 
    SDL_FRect getCameraRect() const override {
        float cameraWidth = getCameraDimensions().x / getScale();
        float cameraHeight = getCameraDimensions().y / getScale();
 
        float cameraX = eyePos.x - cameraWidth / 2.0f ;
        float cameraY = eyePos.y - cameraHeight / 2.0f ;
 
        SDL_FRect cameraRect = { cameraX , cameraY , cameraWidth, cameraHeight };
        return cameraRect;
    }
 
    void setCameraMatrix(glm::mat4 newMatrix) {
        _cameraChange = true;
    }
    void resetCameraPosition() {
 
        _scale = 1.0f;
 
        eyePos = glm::vec3(0.f, 0.f, -770.0f);
        aimPos = glm::vec3( 0,0,0 );
        
        currentViewMode = ViewMode::Y_UP;
        upDir = glm::vec3( 0,-1,0 );
 
        init();
 
        _cameraChange = true;
    }
    float getMinScale() {
        return _minScale;
    }
 
    float getMaxScale() {
        return _maxScale;
    }
 
 
    bool hasChanged() override {
        return _cameraChange;
    }
 
    void makeCameraDirty() override {
        _cameraChange = true;
    }
 
    void refreshCamera() override {
        _cameraChange = false;
    }
 
 
 
    float _minScale = 0.1f, _maxScale = 5.0f;
    float _scale; // decreases when zoom-out
 
};