diff options
Diffstat (limited to 'frontend/linux')
| -rw-r--r-- | frontend/linux/fbdev.c | 240 | ||||
| -rw-r--r-- | frontend/linux/fbdev.h | 12 |
2 files changed, 252 insertions, 0 deletions
diff --git a/frontend/linux/fbdev.c b/frontend/linux/fbdev.c new file mode 100644 index 0000000..6ae0c77 --- /dev/null +++ b/frontend/linux/fbdev.c @@ -0,0 +1,240 @@ +/* + * (C) GraÅžvydas "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); +} + diff --git a/frontend/linux/fbdev.h b/frontend/linux/fbdev.h new file mode 100644 index 0000000..fa163aa --- /dev/null +++ b/frontend/linux/fbdev.h @@ -0,0 +1,12 @@ +struct vout_fbdev; + +struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf); +void *vout_fbdev_flip(struct vout_fbdev *fbdev); +void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev); +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); +void vout_fbdev_clear(struct vout_fbdev *fbdev); +void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count); +int vout_fbdev_get_fd(struct vout_fbdev *fbdev); +void vout_fbdev_finish(struct vout_fbdev *fbdev); |