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Added code to testsprite to detect tearing when flipping

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slouken committed Feb 1, 2003
1 parent 480fd67 commit ad9df418905869f4cd7a809a7a3723ab90c2a064
Showing with 20 additions and 0 deletions.
  1. +20 −0 test/testsprite.c
@@ -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);

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