testvidinfo.c
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/* Simple program -- figure out what kind of video display we have */
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#include <stdlib.h>
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#include <stdio.h>
#include <stdlib.h>
#include "SDL.h"
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#define NUM_BLITS 10
#define NUM_UPDATES 500
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#define FLAG_MASK (SDL_HWSURFACE | SDL_FULLSCREEN | SDL_DOUBLEBUF)
void PrintFlags(Uint32 flags)
{
printf("0x%8.8x", (flags & FLAG_MASK));
if ( flags & SDL_HWSURFACE ) {
printf(" SDL_HWSURFACE");
} else {
printf(" SDL_SWSURFACE");
}
if ( flags & SDL_FULLSCREEN ) {
printf(" | SDL_FULLSCREEN");
}
if ( flags & SDL_DOUBLEBUF ) {
printf(" | SDL_DOUBLEBUF");
}
}
int RunBlitTests(SDL_Surface *screen, SDL_Surface *bmp, int blitcount)
{
int i, j;
int maxx;
int maxy;
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maxx = (int)screen->w - bmp->w + 1;
maxy = (int)screen->h - bmp->h + 1;
for ( i = 0; i < NUM_UPDATES; ++i ) {
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for ( j = 0; j < blitcount; ++j ) {
if ( maxx ) {
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dst.x = rand() % maxx;
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}
if ( maxy ) {
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dst.y = rand() % maxy;
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dst.w = bmp->w;
dst.h = bmp->h;
SDL_BlitSurface(bmp, NULL, screen, &dst);
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SDL_Flip(screen);
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}
return i;
}
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int RunModeTests(SDL_Surface *screen)
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{
Uint32 then, now;
Uint32 frames;
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float seconds;
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int i;
Uint8 r, g, b;
SDL_Surface *bmp, *tmp;
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SDL_Event event;
while ( SDL_PollEvent(&event) ) {
if ( event.type == SDL_KEYDOWN )
return 0;
}
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/* First test fills and screen update speed */
printf("Running color fill and fullscreen update test\n");
then = SDL_GetTicks();
frames = 0;
for ( i = 0; i < 256; ++i ) {
r = i;
g = 0;
b = 0;
SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, r, g, b));
SDL_Flip(screen);
++frames;
}
for ( i = 0; i < 256; ++i ) {
r = 0;
g = i;
b = 0;
SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, r, g, b));
SDL_Flip(screen);
++frames;
}
for ( i = 0; i < 256; ++i ) {
r = 0;
g = 0;
b = i;
SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, r, g, b));
SDL_Flip(screen);
++frames;
}
now = SDL_GetTicks();
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seconds = (float)(now - then) / 1000.0f;
if ( seconds > 0.0f ) {
printf("%d fills and flips in %2.2f seconds, %2.2f FPS\n", frames, seconds, (float)frames / seconds);
} else {
printf("%d fills and flips in zero seconds!n", frames);
}
while ( SDL_PollEvent(&event) ) {
if ( event.type == SDL_KEYDOWN )
return 0;
}
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bmp = SDL_LoadBMP("sample.bmp");
if ( ! bmp ) {
printf("Couldn't load sample.bmp: %s\n", SDL_GetError());
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return 0;
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}
printf("Running freshly loaded blit test: %dx%d at %d bpp, flags: ",
bmp->w, bmp->h, bmp->format->BitsPerPixel);
PrintFlags(bmp->flags);
printf("\n");
then = SDL_GetTicks();
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frames = RunBlitTests(screen, bmp, NUM_BLITS);
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now = SDL_GetTicks();
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seconds = (float)(now - then) / 1000.0f;
if ( seconds > 0.0f ) {
printf("%d blits / %d updates in %2.2f seconds, %2.2f FPS\n", NUM_BLITS*frames, frames, seconds, (float)frames / seconds);
} else {
printf("%d blits / %d updates in zero seconds!\n", NUM_BLITS*frames, frames);
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}
tmp = bmp;
bmp = SDL_DisplayFormat(bmp);
SDL_FreeSurface(tmp);
if ( ! bmp ) {
printf("Couldn't convert sample.bmp: %s\n", SDL_GetError());
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return 0;
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}
printf("Running display format blit test: %dx%d at %d bpp, flags: ",
bmp->w, bmp->h, bmp->format->BitsPerPixel);
PrintFlags(bmp->flags);
printf("\n");
then = SDL_GetTicks();
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frames = RunBlitTests(screen, bmp, NUM_BLITS);
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now = SDL_GetTicks();
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seconds = (float)(now - then) / 1000.0f;
if ( seconds > 0.0f ) {
printf("%d blits / %d updates in %2.2f seconds, %2.2f FPS\n", NUM_BLITS*frames, frames, seconds, (float)frames / seconds);
} else {
printf("%d blits / %d updates in zero seconds!\n", NUM_BLITS*frames, frames);
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}
SDL_FreeSurface(bmp);
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while ( SDL_PollEvent(&event) ) {
if ( event.type == SDL_KEYDOWN )
return 0;
}
return 1;
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}
void RunVideoTests()
{
static const struct {
int w, h, bpp;
} mode_list[] = {
{ 640, 480, 8 }, { 640, 480, 16 }, { 640, 480, 32 },
{ 800, 600, 8 }, { 800, 600, 16 }, { 800, 600, 32 },
{ 1024, 768, 8 }, { 1024, 768, 16 }, { 1024, 768, 32 }
};
static const Uint32 flags[] = {
(SDL_SWSURFACE),
(SDL_SWSURFACE | SDL_FULLSCREEN),
(SDL_HWSURFACE | SDL_FULLSCREEN),
(SDL_HWSURFACE | SDL_FULLSCREEN | SDL_DOUBLEBUF)
};
int i, j;
SDL_Surface *screen;
/* Test out several different video mode combinations */
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SDL_WM_SetCaption("SDL Video Benchmark", "vidtest");
SDL_ShowCursor(0);
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for ( i = 0; i < SDL_TABLESIZE(mode_list); ++i ) {
for ( j = 0; j < SDL_TABLESIZE(flags); ++j ) {
printf("===================================\n");
printf("Setting video mode: %dx%d at %d bpp, flags: ",
mode_list[i].w,
mode_list[i].h,
mode_list[i].bpp);
PrintFlags(flags[j]);
printf("\n");
screen = SDL_SetVideoMode(mode_list[i].w,
mode_list[i].h,
mode_list[i].bpp,
flags[j]);
if ( ! screen ) {
printf("Setting video mode failed: %s\n", SDL_GetError());
continue;
}
if ( (screen->flags & FLAG_MASK) != flags[j] ) {
printf("Flags didn't match: ");
PrintFlags(screen->flags);
printf("\n");
continue;
}
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if ( ! RunModeTests(screen) ) {
return;
}
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int main(int argc, char *argv[])
{
const SDL_VideoInfo *info;
int i;
SDL_Rect **modes;
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char driver[128];
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if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
fprintf(stderr,
"Couldn't initialize SDL: %s\n", SDL_GetError());
exit(1);
}
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if ( SDL_VideoDriverName(driver, sizeof(driver)) ) {
printf("Video driver: %s\n", driver);
}
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info = SDL_GetVideoInfo();
printf(
"Current display: %d bits-per-pixel\n",info->vfmt->BitsPerPixel);
if ( info->vfmt->palette == NULL ) {
printf(" Red Mask = 0x%.8x\n", info->vfmt->Rmask);
printf(" Green Mask = 0x%.8x\n", info->vfmt->Gmask);
printf(" Blue Mask = 0x%.8x\n", info->vfmt->Bmask);
}
/* Print available fullscreen video modes */
modes = SDL_ListModes(NULL, SDL_FULLSCREEN);
if ( modes == (SDL_Rect **)0 ) {
printf("No available fullscreen video modes\n");
} else
if ( modes == (SDL_Rect **)-1 ) {
printf("No special fullscreen video modes\n");
} else {
printf("Fullscreen video modes:\n");
for ( i=0; modes[i]; ++i ) {
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printf("\t%dx%dx%d\n", modes[i]->w, modes[i]->h, info->vfmt->BitsPerPixel);
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}
}
if ( info->wm_available ) {
printf("A window manager is available\n");
}
if ( info->hw_available ) {
printf("Hardware surfaces are available (%dK video memory)\n",
info->video_mem);
}
if ( info->blit_hw ) {
printf(
"Copy blits between hardware surfaces are accelerated\n");
}
if ( info->blit_hw_CC ) {
printf(
"Colorkey blits between hardware surfaces are accelerated\n");
}
if ( info->blit_hw_A ) {
printf(
"Alpha blits between hardware surfaces are accelerated\n");
}
if ( info->blit_sw ) {
printf(
"Copy blits from software surfaces to hardware surfaces are accelerated\n");
}
if ( info->blit_sw_CC ) {
printf(
"Colorkey blits from software surfaces to hardware surfaces are accelerated\n");
}
if ( info->blit_sw_A ) {
printf(
"Alpha blits from software surfaces to hardware surfaces are accelerated\n");
}
if ( info->blit_fill ) {
printf(
"Color fills on hardware surfaces are accelerated\n");
}
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if ( argv[1] && (strcmp(argv[1], "-benchmark") == 0) ) {
RunVideoTests();
}
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SDL_Quit();
return(0);
}