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Added some useful command line arguments for testing
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@slouken
slouken committed Jan 29, 2006
1 parent 4918a32 commit c69f4c0
Showing 1 changed file with 71 additions and 52 deletions.
123 changes: 71 additions & 52 deletions test/testalpha.c
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Expand Up @@ -19,6 +19,45 @@ static void quit(int rc)
exit(rc);
}

/* Fill the screen with a gradient */
static void FillBackground(SDL_Surface *screen)
{
Uint8 *buffer;
Uint16 *buffer16;
Uint16 color;
Uint8 gradient;
int i, k;

/* Set the surface pixels and refresh! */
if ( SDL_LockSurface(screen) < 0 ) {
fprintf(stderr, "Couldn't lock the display surface: %s\n",
SDL_GetError());
quit(2);
}
buffer=(Uint8 *)screen->pixels;
if (screen->format->BytesPerPixel!=2) {
for ( i=0; i<screen->h; ++i ) {
memset(buffer,(i*255)/screen->h, screen->w*screen->format->BytesPerPixel);
buffer += screen->pitch;
}
}
else
{
for ( i=0; i<screen->h; ++i ) {
gradient=((i*255)/screen->h);
color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
buffer16=(Uint16*)buffer;
for (k=0; k<screen->w; k++)
{
*(buffer16+k)=color;
}
buffer += screen->pitch;
}
}

SDL_UnlockSurface(screen);
SDL_UpdateRect(screen, 0, 0, 0, 0);
}

/* Create a "light" -- a yellowish surface with variable alpha */
SDL_Surface *CreateLight(SDL_Surface *screen, int radius)
Expand Down Expand Up @@ -284,17 +323,14 @@ int main(int argc, char *argv[])
{
const SDL_VideoInfo *info;
SDL_Surface *screen;
int w, h;
Uint8 video_bpp;
Uint32 videoflags;
Uint8 *buffer;
int i, k, done;
int i, done;
SDL_Event event;
SDL_Surface *light;
int mouse_pressed;
Uint32 ticks, lastticks;
Uint16 *buffer16;
Uint16 color;
Uint8 gradient;


/* Initialize SDL */
Expand All @@ -304,6 +340,8 @@ int main(int argc, char *argv[])
}

/* Alpha blending doesn't work well at 8-bit color */
w = 640;
h = 480;
info = SDL_GetVideoInfo();
if ( info->vfmt->BitsPerPixel > 8 ) {
video_bpp = info->vfmt->BitsPerPixel;
Expand All @@ -312,35 +350,45 @@ int main(int argc, char *argv[])
fprintf(stderr, "forced 16 bpp mode\n");
}
videoflags = SDL_SWSURFACE;
while ( argc > 1 ) {
--argc;
if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
video_bpp = atoi(argv[argc]);
for ( i = 1; argv[i]; ++i ) {
if ( strcmp(argv[i], "-bpp") == 0 ) {
video_bpp = atoi(argv[++i]);
if (video_bpp<=8) {
video_bpp=16;
fprintf(stderr, "forced 16 bpp mode\n");
}
--argc;
} else
if ( strcmp(argv[argc], "-hw") == 0 ) {
if ( strcmp(argv[i], "-hw") == 0 ) {
videoflags |= SDL_HWSURFACE;
} else
if ( strcmp(argv[argc], "-warp") == 0 ) {
if ( strcmp(argv[i], "-warp") == 0 ) {
videoflags |= SDL_HWPALETTE;
} else
if ( strcmp(argv[argc], "-fullscreen") == 0 ) {
if ( strcmp(argv[i], "-width") == 0 && argv[i+1] ) {
w = atoi(argv[++i]);
} else
if ( strcmp(argv[i], "-height") == 0 && argv[i+1] ) {
h = atoi(argv[++i]);
} else
if ( strcmp(argv[i], "-resize") == 0 ) {
videoflags |= SDL_RESIZABLE;
} else
if ( strcmp(argv[i], "-noframe") == 0 ) {
videoflags |= SDL_NOFRAME;
} else
if ( strcmp(argv[i], "-fullscreen") == 0 ) {
videoflags |= SDL_FULLSCREEN;
} else {
fprintf(stderr,
"Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
"Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n",
argv[0]);
quit(1);
}
}

/* Set 640x480 video mode */
#ifndef _WIN32_WCE
if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) {
if ( (screen=SDL_SetVideoMode(w,h,video_bpp,videoflags)) == NULL ) {
fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
video_bpp, SDL_GetError());
quit(2);
Expand All @@ -353,35 +401,7 @@ int main(int argc, char *argv[])
quit(2);
}
#endif
/* Set the surface pixels and refresh! */
if ( SDL_LockSurface(screen) < 0 ) {
fprintf(stderr, "Couldn't lock the display surface: %s\n",
SDL_GetError());
quit(2);
}
buffer=(Uint8 *)screen->pixels;
if (screen->format->BytesPerPixel!=2) {
for ( i=0; i<screen->h; ++i ) {
memset(buffer,(i*255)/screen->h, screen->pitch);
buffer += screen->pitch;
}
}
else
{
for ( i=0; i<screen->h; ++i ) {
gradient=((i*255)/screen->h);
color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
buffer16=(Uint16*)buffer;
for (k=0; k<screen->w; k++)
{
*(buffer16+k)=color;
}
buffer += screen->pitch;
}
}

SDL_UnlockSurface(screen);
SDL_UpdateRect(screen, 0, 0, 0, 0);
FillBackground(screen);

/* Create the light */
light = CreateLight(screen, 82);
Expand Down Expand Up @@ -412,14 +432,7 @@ int main(int argc, char *argv[])
}

/* Run a sample blit to trigger blit acceleration */
{ SDL_Rect dst;
dst.x = 0;
dst.y = 0;
dst.w = sprite->w;
dst.h = sprite->h;
SDL_BlitSurface(sprite, NULL, screen, &dst);
SDL_FillRect(screen, &dst, 0);
}
MoveSprite(screen, NULL);
if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
printf("Sprite blit uses hardware alpha acceleration\n");
} else {
Expand Down Expand Up @@ -464,6 +477,12 @@ fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks));
/* Check for events */
while ( SDL_PollEvent(&event) ) {
switch (event.type) {
case SDL_VIDEORESIZE:
screen = SDL_SetVideoMode(event.resize.w, event.resize.h, video_bpp, videoflags);
if ( screen ) {
FillBackground(screen);
}
break;
/* Attract sprite while mouse is held down */
case SDL_MOUSEMOTION:
if (event.motion.state != 0) {
Expand Down

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