int pl_fbdev_open(void)
{
struct timeval now;
pl_fbdev_buf = vout_fbdev_flip(layer_fb);
omap_enable_layer(1);
// try to align redraws to vsync
vout_fbdev_wait_vsync(layer_fb);
gettimeofday(&now, 0);
vsync_usec_time = now.tv_usec;
while (vsync_usec_time >= pl_frame_interval)
vsync_usec_time -= pl_frame_interval;
return 0;
}
/* it is recommended to call vout_fbdev_clear() before this */
void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
{
int w_total = left_border + w + right_border;
int h_total = top_border + h + bottom_border;
size_t mem_size;
int ret;
// unblank to be sure the mode is really accepted
ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
if (fbdev->fbvar_new.bits_per_pixel != bpp ||
fbdev->fbvar_new.xres != w ||
fbdev->fbvar_new.yres != h ||
fbdev->fbvar_new.xres_virtual != w_total||
fbdev->fbvar_new.yres_virtual < h_total ||
fbdev->fbvar_new.xoffset != left_border ||
fbdev->buffer_count != buffer_cnt)
{
if (fbdev->fbvar_new.bits_per_pixel != bpp ||
w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
printf(PFX "switching to %dx%d@%d\n", w, h, bpp);
fbdev->fbvar_new.xres = w;
fbdev->fbvar_new.yres = h;
fbdev->fbvar_new.xres_virtual = w_total;
fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
fbdev->fbvar_new.xoffset = left_border;
fbdev->fbvar_new.yoffset = top_border;
fbdev->fbvar_new.bits_per_pixel = bpp;
fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
fbdev->buffer_count = buffer_cnt;
fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;
// seems to help a bit to avoid glitches
vout_fbdev_wait_vsync(fbdev);
ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
if (ret == -1) {
// retry with no multibuffering
fbdev->fbvar_new.yres_virtual = h_total;
ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
if (ret == -1) {
perror(PFX "FBIOPUT_VSCREENINFO ioctl");
return NULL;
}
fbdev->buffer_count = 1;
fbdev->buffer_write = 0;
fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
"multibuffering disabled\n");
}
}
fbdev->fb_size = w_total * h_total * bpp / 8;
fbdev->top_border = top_border;
fbdev->bottom_border = bottom_border;
mem_size = fbdev->fb_size * fbdev->buffer_count;
if (fbdev->mem_size >= mem_size)
goto out;
if (fbdev->mem != NULL)
munmap(fbdev->mem, fbdev->mem_size);
fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
fbdev->buffer_count = 1;
fbdev->buffer_write = 0;
mem_size = fbdev->fb_size;
fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
}
if (fbdev->mem == MAP_FAILED) {
fbdev->mem = NULL;
fbdev->mem_size = 0;
perror(PFX "mmap framebuffer");
return NULL;
}
fbdev->mem_size = mem_size;
out:
return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}
