SDL无法在游戏窗口上渲染屏幕

Question

我正在努力用SDL在游戏窗口上渲染一个正方形。我有两个文件，SZ_Player.h和SZ.Player.cpp，然后是主文件。我还通过执行“ SZ_Player examplePlayer”来初始化SZ_Player，以及通过“包括” SZ_Player.h”来包括它。

我不确定为什么它没有显示出来，我在代码下面有图片：

SZ_Player.h

#ifndef playerFile
#define playerFile

#include <iostream>
#include "SDL.h"

class SZ_Player
{
public:
    SZ_Player();
    ~SZ_Player();

    void Init();
    void Update();
    void Input();
    void Render(SDL_Renderer* pRenderer);
    SDL_Rect player;
    int x, y, height, width, R, G, B;
};

#endif

SZ_Player.cpp

#include "SZ_Player.h"

SZ_Player::SZ_Player()
{

}
SZ_Player::~SZ_Player()
{

}

void SZ_Player::Init()
{
    player.x = 70;
    player.y = 70;
    player.w = 100;
    player.h = 100;

    R = 255;
    G = 255;
    B = 255;
}

void SZ_Player::Update()
{

}

void SZ_Player::Input()
{

}

void SZ_Player::Render(SDL_Renderer* pRenderer)
{
    SDL_SetRenderDrawColor(pRenderer, R, G, B, 255);
    SDL_RenderDrawRect(pRenderer, &player);
}

main.cpp

#include <iostream>

#include "SDL.h"
#include "SDL_image.h"
#include "SDL_mixer.h"

using namespace std;

#include "SZ_timer.h"
SZ_Timer aTimer;
const int DELTA_TIME = 10;
bool done = false;

#include "SZ_Player.h"
SZ_Player examplePlayer;

int main(int argc, char *argv[])
{
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0);

    // Creates the game window
    SDL_Window* game_window = SDL_CreateWindow("Rise", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);

    // Creates the game render to draw on the game window.
    SDL_Renderer* game_renderer = SDL_CreateRenderer(game_window, 0, 0);

    // Game Loop
    while (!done)
    {
        aTimer.resetTicksTimer();

        SDL_SetRenderDrawColor(game_renderer, 0, 0, 20, SDL_ALPHA_OPAQUE);
        SDL_RenderClear(game_renderer);
        examplePlayer.Render(game_renderer);
        SDL_RenderPresent(game_renderer);

        // If less time has passed than allocated block, wait difference
        if (aTimer.getTicks() < DELTA_TIME)
        {
            SDL_Delay(DELTA_TIME - aTimer.getTicks());
        }
    }
    SDL_Quit();

    // Exits program
    return 0;
}