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/*
* (C) Gražvydas "notaz" Ignotas, 2009-2010
*
* This work is licensed under the terms of the 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/matroxfb.h>
#include "fbdev.h"
#define FBDEV_MAX_BUFFERS 3
struct vout_fbdev {
int fd;
void *mem;
size_t mem_size;
struct fb_var_screeninfo fbvar_old;
struct fb_var_screeninfo fbvar_new;
int buffer_write;
int fb_size;
int buffer_count;
int top_border, bottom_border;
};
void *vout_fbdev_flip(struct vout_fbdev *fbdev)
{
int draw_buf;
if (fbdev->buffer_count < 2)
return fbdev->mem;
draw_buf = fbdev->buffer_write;
fbdev->buffer_write++;
if (fbdev->buffer_write >= fbdev->buffer_count)
fbdev->buffer_write = 0;
fbdev->fbvar_new.yoffset =
(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
fbdev->top_border;
ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}
void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
{
int arg = 0;
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)
{
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 != 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) {
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->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->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
if (no_dblbuf)
fbdev->buffer_count = 1;
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) {
fbdev->buffer_count = 1;
fprintf(stderr, "Warning: failed to increase virtual resolution, "
"doublebuffering disabled\n");
}
}
fbdev->fb_size = w_total * h_total * 2;
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;
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);
fbdev->buffer_count = 1;
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("mmap framebuffer");
return -1;
}
fbdev->mem_size = mem_size;
return 0;
}
void vout_fbdev_clear(struct vout_fbdev *fbdev)
{
memset(fbdev->mem, 0, fbdev->mem_size);
}
void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
{
int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
int i;
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++)
memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
}
int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
{
return fbdev->fd;
}
struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf)
{
struct vout_fbdev *fbdev;
int req_w, req_h;
int ret;
fbdev = calloc(1, sizeof(*fbdev));
if (fbdev == NULL)
return NULL;
fbdev->fd = open(fbdev_name, O_RDWR);
if (fbdev->fd == -1) {
fprintf(stderr, "%s: ", fbdev_name);
perror("open");
goto fail_open;
}
ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
if (ret == -1) {
perror("FBIOGET_VSCREENINFO ioctl");
goto fail;
}
fbdev->fbvar_new = fbdev->fbvar_old;
req_w = fbdev->fbvar_new.xres;
if (*w != 0)
req_w = *w;
req_h = fbdev->fbvar_new.yres;
if (*h != 0)
req_h = *h;
ret = vout_fbdev_resize(fbdev, req_w, req_h, 0, 0, 0, 0, no_dblbuf);
if (ret != 0)
goto fail;
printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
fbdev->fbvar_new.bits_per_pixel);
*w = fbdev->fbvar_new.xres;
*h = fbdev->fbvar_new.yres;
memset(fbdev->mem, 0, fbdev->mem_size);
// some checks
ret = 0;
ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
if (ret != 0)
fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
if (fbdev->buffer_count > 1) {
fbdev->buffer_write = 0;
fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
if (ret != 0) {
fbdev->buffer_count = 1;
fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
}
}
printf("fbdev initialized.\n");
return fbdev;
fail:
close(fbdev->fd);
fail_open:
free(fbdev);
return NULL;
}
void vout_fbdev_finish(struct vout_fbdev *fbdev)
{
ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
if (fbdev->mem != MAP_FAILED)
munmap(fbdev->mem, fbdev->mem_size);
if (fbdev->fd >= 0)
close(fbdev->fd);
fbdev->mem = NULL;
fbdev->fd = -1;
free(fbdev);
}
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