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Added code to testsprite to detect tearing when flipping

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This commit is contained in:
Sam Lantinga 2003-02-01 19:56:45 +00:00
parent 713abbb21a
commit 3f9d5f4381
1 changed files with 20 additions and 0 deletions
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20
test/testsprite.c
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@ -8,6 +8,8 @@
#include "SDL.h"
#define DEBUG_FLIP 1
#define NUM_SPRITES 100
#define MAX_SPEED 1
@ -52,6 +54,10 @@ int LoadSprite(SDL_Surface *screen, char *file)
void MoveSprites(SDL_Surface *screen, Uint32 background)
{
#if DEBUG_FLIP
static int t = 0;
#endif
int i, nupdates;
SDL_Rect area, *position, *velocity;
@ -82,6 +88,20 @@ void MoveSprites(SDL_Surface *screen, Uint32 background)
sprite_rects[nupdates++] = area;
}
#if DEBUG_FLIP
{
Uint32 color = SDL_MapRGB (screen->format, 255, 0, 0);
SDL_Rect r;
r.x = (sin((float)t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w-20);
r.y = 0;
r.w = 20;
r.h = screen->h;
SDL_FillRect (screen, &r, color);
t+=2;
}
#endif
/* Update the screen! */
if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
SDL_Flip(screen);