简单的SDL程序，速度却非常慢

green21st

我也遇到同样的问题,高手帮帮忙

linux_________

是不是SDL_Flip(screen)太频繁了,SDL_MOUSEMOTION事件来的多

xiaoshao_0_0

你可以用SDL的函数得到你的硬件信息。
#include "SDL.h"

SDL_VideoInfo *SDL_GetVideoInfo (void);

Structure Definition

typedef struct{
  Uint32 hw_available:1;
  Uint32 wm_available:1;
  Uint32 blit_hw:1;
  Uint32 blit_hw_CC:1;
  Uint32 blit_hw_A:1;
  Uint32 blit_sw:1;
  Uint32 blit_sw_CC:1;
  Uint32 blit_sw_A:1;
  Uint32 blit_fill;
  Uint32 video_mem;
  SDL_PixelFormat *vfmt;
} SDL_VideoInfo;

Structure Data
hw_available         Is it possible to create hardware surfaces?
wm_available         Is there a window manager available
blit_hw         Are hardware to hardware blits accelerated?
blit_hw_CC         Are hardware to hardware colorkey blits accelerated?
blit_hw_A         Are hardware to hardware alpha blits accelerated?
blit_sw         Are software to hardware blits accelerated?
blit_sw_CC         Are software to hardware colorkey blits accelerated?
blit_sw_A         Are software to hardware alpha blits accelerated?
blit_fill         Are color fills accelerated?
video_mem         Total amount of video memory in Kilobytes
vfmt         Pixel format of the video device

另外，即使用了官方的驱动，一样做不到HWSUFACE。
这个我也很奇怪。
另外，UpdateRect一定会好一些。你的程序可以在稍微减小FPS，也就是延长interval 例如
30FPS＝1000/33ms,interval=33会好很多吧

xiaoshao_0_0

#include "SDL/SDL.h"
int main()
{
        SDL_Surface *screen;
        SDL_VideoInfo* ptr;
                if(SDL_Init(SDL_INIT_VIDEO) < 0){
                printf("Could not initializing SDL: %s.\n",SDL_GetError());
                exit(-1);
        }
        atexit(SDL_Quit);
        screen = SDL_SetVideoMode(800, 600, 32, SDL_HWSURFACE|SDL_DOUBLEBUF);
        if(screen == NULL){
        fprintf(stderr, "Couldn't set 800x600x32 video mode: %s\n", SDL_GetError());
        exit(1);
        }
        ptr=SDL_GetVideoInfo();
        if(ptr) printf("%d=hw avaible\n",ptr->hw_available);
        else printf("error");
        return 0;
}

gcc new.c -lSDL
./a.out
0=hardware avaible

sunmoon1997

没有加速。所以慢是正常的。

ideawu

9个月后回来结贴:
是显卡驱动的问题.