+/*
+ * (C) GraÅžvydas "notaz" Ignotas, 2009-2010
+ *
+ * This work is licensed under the terms of any of these licenses
+ * (at your option):
+ * - GNU GPL, version 2 or later.
+ * - GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fbdev.h"
-#define FBDEV_MAX_BUFFERS 3
-
struct vout_fbdev {
int fd;
void *mem;
ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
}
-int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h,
- int left_border, int right_border, int top_border, int bottom_border, int no_dblbuf)
+/* 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;
// unblank to be sure the mode is really accepted
ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
- if (fbdev->fbvar_new.bits_per_pixel != 16 ||
- w != fbdev->fbvar_new.xres ||
- h != fbdev->fbvar_new.yres ||
- w_total != fbdev->fbvar_new.xres_virtual ||
- h_total > fbdev->fbvar_new.yres_virtual ||
- left_border != fbdev->fbvar_new.xoffset) {
+ 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(" 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;
+ fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
fbdev->fbvar_new.xoffset = left_border;
- fbdev->fbvar_new.bits_per_pixel = 16;
- printf(" switching to %dx%d@16\n", w, h);
- ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
- if (ret == -1) {
- perror("FBIOPUT_VSCREENINFO ioctl");
- return -1;
- }
- }
+ 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 = 1;
- fbdev->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
- if (no_dblbuf)
- fbdev->buffer_count = 1;
+ // seems to help a bit to avoid glitches
+ vout_fbdev_wait_vsync(fbdev);
- if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
- fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
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("FBIOPUT_VSCREENINFO ioctl");
+ return NULL;
+ }
fbdev->buffer_count = 1;
+ fbdev->buffer_write = 0;
fprintf(stderr, "Warning: failed to increase virtual resolution, "
- "doublebuffering disabled\n");
+ "multibuffering disabled\n");
}
+
}
- fbdev->fb_size = w_total * h_total * 2;
+ 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)
- return 0;
+ 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, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size);
+ fprintf(stderr, "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);
}
fbdev->mem = NULL;
fbdev->mem_size = 0;
perror("mmap framebuffer");
- return -1;
+ return NULL;
}
fbdev->mem_size = mem_size;
- return 0;
+
+out:
+ return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}
void vout_fbdev_clear(struct vout_fbdev *fbdev)
void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
{
- int stride = fbdev->fbvar_new.xres * fbdev->fbvar_new.bits_per_pixel / 8;
+ int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
int i;
- if (y + count > fbdev->fbvar_new.yres)
- count = fbdev->fbvar_new.yres - y;
+ if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
+ count = fbdev->top_border + fbdev->fbvar_new.yres - y;
if (y >= 0 && count > 0)
for (i = 0; i < fbdev->buffer_count; i++)
return fbdev->fd;
}
-struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf)
+struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
{
struct vout_fbdev *fbdev;
int req_w, req_h;
+ void *pret;
int ret;
fbdev = calloc(1, sizeof(*fbdev));
if (*h != 0)
req_h = *h;
- ret = vout_fbdev_resize(fbdev, req_w, req_h, 0, 0, 0, 0, no_dblbuf);
- if (ret != 0)
+ pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
+ if (pret == NULL)
goto fail;
printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,