OrdinaryMagician/stuff
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I guess I can just put this up. Most of these have been sitting here forever.

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Marisa the Magician 2017-09-04 11:24:40 +02:00
commit d2777092d1
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vc2sdl.c Normal file
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#include <bcm_host.h>
#include <SDL2/SDL.h>
#include <time.h>
#define TMAX 64
int ti = 0;
float ts = 0.f, tl[TMAX] = {0.f};
float avg_fps( float nt )
{
ts = ts-tl[ti]+nt;
tl[ti] = nt;
if ( ++ti == TMAX ) ti = 0;
return ts/TMAX;
}
#define NANOS_SEC 1000000000L
long ticker( void )
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC_RAW,&ts);
return ts.tv_nsec+ts.tv_sec*NANOS_SEC;
}
int main( int argc, char **argv )
{
unsigned reduce = 1;
unsigned width = 720, height = 480;
if ( argc > 2 )
{
sscanf(argv[2],"%u",&reduce);
sscanf(argv[1],"%ux%u",&width,&height);
}
width /= reduce;
height /= reduce;
bcm_host_init();
DISPMANX_DISPLAY_HANDLE_T d = vc_dispmanx_display_open(0);
if ( !d ) return 1;
DISPMANX_MODEINFO_T m;
if ( vc_dispmanx_display_get_info(d,&m) )
{
vc_dispmanx_display_close(d);
return 2;
}
unsigned pt;
DISPMANX_RESOURCE_HANDLE_T r =
vc_dispmanx_resource_create(VC_IMAGE_RGB888,width,height,&pt);
if ( !r )
{
vc_dispmanx_display_close(d);
return 4;
}
VC_RECT_T rt;
vc_dispmanx_rect_set(&rt,0,0,width,height);
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *w = SDL_CreateWindow("VC4 Feed",SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,width,height,SDL_WINDOW_SHOWN);
SDL_Surface *ws = SDL_GetWindowSurface(w);
SDL_Surface *copy = SDL_CreateRGBSurface(0,width,height,24,0xFF,0xFF00,
0xFF0000,0);
int active = 1;
SDL_Event e;
long tick, tock;
float frame = 0.f, fps = NAN, fpsmin = INFINITY, fpsmax = -INFINITY,
fpsavg = 0.f;
while ( active )
{
tick = ticker();
while ( SDL_PollEvent(&e) )
if ( e.type == SDL_QUIT ) active = 0;
vc_dispmanx_snapshot(d,r,0);
vc_dispmanx_resource_read_data(r,&rt,copy->pixels,copy->pitch);
SDL_BlitSurface(copy,0,ws,0);
SDL_UpdateWindowSurface(w);
tock = ticker();
frame = (float)(tock-tick)/NANOS_SEC;
fps = 1.f/frame;
fpsavg = avg_fps(fps);
if ( fps > fpsmax ) fpsmax = fps;
if ( fps < fpsmin ) fpsmin = fps;
printf("FPS: %.2f (%.2f min, %.2f max, %.2f avg)\n",fps,
fpsmin,fpsmax,fpsavg);
}
vc_dispmanx_display_close(d);
SDL_FreeSurface(copy);
SDL_DestroyWindow(w);
SDL_Quit();
return 0;
}