//-------------------------------------------------------------------
//	trysis.cpp
//
//	This program tests the 'mysis.c' character device-driver.
//
//	programmer: ALLAN CRUSE
//	written on: 22 APR 2003
//-------------------------------------------------------------------

#include <stdio.h>	// for printf(), perror() 
#include <fcntl.h>	// for open() 
#include <stdlib.h>	// for exit() 
#include <unistd.h>	// for read(), write(), close() 
#include <sys/mman.h>	// for mmap(), munmap()

#define PEL_SIZE 4
#define HRES 1280
#define VRES 960
#define N_PELS (HRES*VRES)
#define FB_BYTES (N_PELS*PEL_SIZE)
#define FILENAME "/dev/vram"

void draw_border( long *vram, int indent, long color )
{
	int	r = indent;
	int	k = indent;
	do { vram[ r*HRES + k ] = color; k += 1; } while( k < HRES-1-indent );
	do { vram[ r*HRES + k ] = color; r += 1; } while( r < VRES-1-indent );
	do { vram[ r*HRES + k ] = color; k -= 1; } while( k >        indent );
	do { vram[ r*HRES + k ] = color; r -= 1; } while( r >        indent );
}	
	
int main( int argc, char **argv )
{
	int	fd = open( FILENAME, O_RDWR );
	if ( fd < 0 ) { perror( FILENAME ); exit(1); }

	int	filesize = lseek( fd, 0, SEEK_END );
	lseek( fd, 0, SEEK_SET );
	
	int	prot = PROT_READ | PROT_WRITE;
	int	flags = MAP_SHARED;	
	int	offset = 0;
	long	*vram = (long*)mmap( 0, filesize, prot, flags, fd, offset );
	if ( vram < 0 ) { perror( "mmap" ); exit(1); }
	
	// try doing some direct drawing
	for (int i = 0; i < VRES/2; i++) draw_border( vram, i, (i*10)<<8 );
	
	pause();
	munmap( vram, filesize );
}