我正在使用C ++和SDL制作游戏,该游戏是“太空侵略者”类型的游戏。一切都进行得很顺利,直到我在while循环中添加了背景图片,这是背景的渲染和初始化代码:
SZ_Background.cpp:
void SZ_Background::Init(SDL_Renderer* pRenderer)
{
int w, h;
SDL_GetRendererOutputSize(pRenderer, &w, &h);
bg_img.x = 0;
bg_img.y = 0;
bg_img.h = h;
bg_img.w = w;
SDL_Surface* background_img = IMG_Load("content/bg_img.bmp");
SDL_Texture* background_img_tex = SDL_CreateTextureFromSurface(pRenderer, background_img);
SDL_RenderCopy(pRenderer, background_img_tex, NULL, &bg_img);
}
void SZ_Background::Render(SDL_Renderer* pRenderer)
{
int w, h;
SDL_GetRendererOutputSize(pRenderer, &w, &h);
bg_img.x = 0;
bg_img.y = 0;
bg_img.h = h;
bg_img.w = w;
SDL_Surface* background_img = IMG_Load("content/bg_img.bmp");
SDL_Texture* background_img_tex = SDL_CreateTextureFromSurface(pRenderer, background_img);
SDL_RenderCopy(pRenderer, background_img_tex, NULL, &bg_img);
}
main.cpp-循环:
if (GameState == 3)
{
printf("INFO: Game State: %d - Game Screen Loaded\n", GameState);
mainEnemies.gameover = false;
mainBG.Init(game_renderer);
gOver.Init(game_renderer);
while (!done)
{
aTimer.resetTicksTimer();
SDL_SetRenderDrawColor(game_renderer, 0, 0, 20, SDL_ALPHA_OPAQUE);
SDL_RenderClear(game_renderer);
mainBG.Render(game_renderer);
gOver.Update(game_renderer);
gOver.Input();
gOver.Render(game_renderer);
SDL_RenderPresent(game_renderer);
if (gOver.rMenu == true)
{
SDL_RenderClear(game_renderer);
SDL_RenderPresent(game_renderer);
GameState = 0;
break;
}
if (aTimer.getTicks() < DELTA_TIME)
{
SDL_Delay(DELTA_TIME - aTimer.getTicks());
}
}
}
mainBG是背景。
答案 0 :(得分:1)
问题在于,每次调用background_img
时,您都要初始化background_img_tex
和SZ_Background::Render
:
SDL_Surface* background_img = IMG_Load("content/bg_img.bmp");
SDL_Texture* background_img_tex = SDL_CreateTextureFromSurface(pRenderer,background_img);
这不是必需的,您已经在SZ_Background::Init
中对其进行了初始化,这就是您需要做的。现在的方式不仅会通过每帧从磁盘加载背景来减慢程序速度,而且每次还会泄漏内存(主要是SDL_Surface
的RAM,以及SDL_Texture的GPU内存)。删除IMG_Load
中的SDL_CreateTextureFromSurface
和Render
调用,这样会更好。