Sdl frame buffer display problem

SDL Development
1

Hi

I am tring to run sdl frame buffer applicaton
on ibm settopbox Power PC . It also contains a
TVIA CyberPro 5202 multimedia processor with graphics acceleration.
with framebuffer enabled kernal.

I configured sdl-1.2.9 by enabling fbcon.
and then i try to run testspritebut when i run the application
its displaying a black screen.testsprite is running but no display.

cat /proc/fb is showing 0 CyberPro5202

regards
sachin–
Open WebMail Project (http://openwebmail.org)

2

you may want to try dumping the buffer to a bitmap:

int SDL_SaveBMP(SDL_Surface *surface, const char *file); may be your
solution…if there is a picture, then the problem is in the display, if
there is no picture, then there is something wrong either with your buffer
or your code

hope that helps

Alex~

3

I am trying ro run testsprite.c which comes along with sdl.
code is not modified.Its displaying Black-screen.

I am trying framebuffer for the first time.

I tried to save bmp “int SDL_SaveBMP(SDL_Surface *surface, const char
*file);” its working properly.I got the image.

testvidinfo give this output

./testvidinfo
Video driver: fbcon
Current display: 16 bits-per-pixel
Red Mask = 0x0000f800
Green Mask = 0x000007e0
Blue Mask = 0x0000001f
Fullscreen video modes:
1024x768x16
800x600x16
640x480x16
Hardware surfaces are available (8192K video memory)

code below is working.Its displaying .
that meance frame buffer is working

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>

int main()
{
int fbfd = 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long int screensize = 0;
char *fbp = 0;
int x = 0, y = 0;
long int location = 0;

    /* Open the file for reading and writing */
    fbfd = open("/dev/fb0", O_RDWR);
    if (!fbfd) {
            printf("Error: cannot open framebuffer device.\n");
            exit(1);
    }

system("sm 800 600 75 24");

    /* Get fixed screen information */
    if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
            printf("Error reading fixed information.\n");
            exit(2);
    }

    /* Get variable screen information */
    if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {
            printf("Error reading variable information.\n");

            exit(3);
    }
    
    

    /* Figure out the size of the screen in bytes */
    screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
    
    /* Map the device to memory */
    fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,
            fbfd, 0);       
    if ((int)fbp == -1) { 
    	printf("Error: failed to map framebuffer device to memory.\n");
    	exit(5);
    }
    printf("The framebuffer device was mapped to memory successfully.\n");
printf("Draw color pixels random. (range: x= 400-500, y= 400-500)\n");

system("clear");
usleep(1000);
printf("*********************************************************\n");
printf("******     Change mode to 800x600 75Hz 24 bpp     *******\n");
printf("*********************************************************\n");

for(x=0 ;x<0x100; x++){
for(y=0; y<0x100; y++){
/* Where we are going to put the pixel */

    /* Figure out where in memory to put the pixel */
location = (x+200) * (vinfo.bits_per_pixel/8) + (y+200)* finfo.line_length;

    *(fbp + location)     = x;   		/* blue  */
    *(fbp + location + 1) = 0xaa;		/* green */
    *(fbp + location + 2) = 0xff -y;	/* red   */
}

}

    munmap(fbp, screensize);
    close(fbfd);
    return 0;

}

This is the system info i have

cat /proc/fb

0 CyberPro5202

cat /proc/cpuinfo

cpu : STB04xxx
clock : 252MHz
revision : 9.82 (pvr 4181 0952)
bogomips : 251.49
machine : IBM Redwood5
plb bus clock : 63MHz

sachin> Message: 9

Date: Wed, 22 Mar 2006 16:35:12 -0500
From: “Alex Barry” <alex.barry at gmail.com>
Subject: Re: [SDL] sdl frame buffer display problem
To: “A list for developers using the SDL library. (includes
SDL-announce)”
Message-ID:
<2563633b0603221335y2d3ccff2j503e83383fe87441 at mail.gmail.com>
Content-Type: text/plain; charset=“iso-8859-1”

you may want to try dumping the buffer to a bitmap:

int SDL_SaveBMP(SDL_Surface *surface, const char *file); may be
your solution…if there is a picture, then the problem is in the
display, if there is no picture, then there is something wrong
either with your buffer or your code

hope that helps

Alex~