Game Gear Micro >> C/C++

Framebuffer

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main.c

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

#define FB_SIZE (240 * 240 * 2 * 4)

static int fb_dev = -1;
static uint16_t *fb_mem = NULL;
static struct fb_var_screeninfo vinfo = {0};

static int fb_init(void)
{
    fb_dev = open("/dev/fb0", O_RDWR);
    if(fb_dev < 0) {
        printf("failed to open /dev/fb0\n");
        return -1;
    }

    if(ioctl(fb_dev, FBIOGET_VSCREENINFO, &vinfo) < 0) {
        close(fb_dev);
        printf("failed to ioctl /dev/fb0\n");
        return -1;
    }

    fb_mem = (uint16_t *)mmap(NULL, FB_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fb_dev, 0);
    if(fb_mem == (void *) -1) {
        close(fb_dev);
        printf("failed to mmap /dev/fb0\n");
        return -1;
    }
    memset(fb_mem, 0, FB_SIZE);
    return 0;
}

static int fb_uninit(void)
{
    munmap(fb_mem, FB_SIZE);
    fb_mem = NULL;

    close(fb_dev);
    fb_dev = -1;
    return 0;
}

int main(int argc, char **argv)
{
    uint32_t cc = 0;
    int x = 0, y = 0, ret = 0;
    uint16_t *p = NULL, col[] = {0xf800, 0x7e0, 0x1f};

    fb_init();
    vinfo.yres_virtual = 240 * 4;
    ioctl(fb_dev, FBIOPUT_VSCREENINFO, &vinfo);
    while(1) {
        p = fb_mem + (240 * 240 * (cc % 4));
        for(y = 0; y < 240; y++) {
            for(x = 0; x < 240; x++) {
                *p++ = col[cc % 3];
            }
        }
        vinfo.yoffset = 240 * (cc % 4);
        ioctl(fb_dev, FBIOPAN_DISPLAY, &vinfo);
        ioctl(fb_dev, FBIO_WAITFORVSYNC, &ret);
        cc += 1;
    }
    fb_uninit();
    return 0;
}

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