11 #include <linux/matroxfb.h>
15 #define FBDEV_MAX_BUFFERS 3
21 struct fb_var_screeninfo fbvar_old;
22 struct fb_var_screeninfo fbvar_new;
26 int top_border, bottom_border;
29 void *vout_fbdev_flip(struct vout_fbdev *fbdev)
33 if (fbdev->buffer_count < 2)
36 draw_buf = fbdev->buffer_write;
37 fbdev->buffer_write++;
38 if (fbdev->buffer_write >= fbdev->buffer_count)
39 fbdev->buffer_write = 0;
41 fbdev->fbvar_new.yoffset =
42 (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
45 ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
47 return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
50 void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
53 ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
56 int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h,
57 int left_border, int right_border, int top_border, int bottom_border, int no_dblbuf)
59 int w_total = left_border + w + right_border;
60 int h_total = top_border + h + bottom_border;
64 // unblank to be sure the mode is really accepted
65 ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
67 if (fbdev->fbvar_new.bits_per_pixel != 16 ||
68 w != fbdev->fbvar_new.xres ||
69 h != fbdev->fbvar_new.yres ||
70 w_total != fbdev->fbvar_new.xres_virtual ||
71 h_total > fbdev->fbvar_new.yres_virtual ||
72 left_border != fbdev->fbvar_new.xoffset) {
73 fbdev->fbvar_new.xres = w;
74 fbdev->fbvar_new.yres = h;
75 fbdev->fbvar_new.xres_virtual = w_total;
76 fbdev->fbvar_new.yres_virtual = h_total;
77 fbdev->fbvar_new.xoffset = left_border;
78 fbdev->fbvar_new.bits_per_pixel = 16;
79 printf(" switching to %dx%d@16\n", w, h);
80 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
82 perror("FBIOPUT_VSCREENINFO ioctl");
87 fbdev->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
89 fbdev->buffer_count = 1;
91 if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) {
92 fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count;
93 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
95 fbdev->buffer_count = 1;
96 fprintf(stderr, "Warning: failed to increase virtual resolution, "
97 "doublebuffering disabled\n");
101 fbdev->fb_size = w_total * h_total * 2;
102 fbdev->top_border = top_border;
103 fbdev->bottom_border = bottom_border;
105 mem_size = fbdev->fb_size * fbdev->buffer_count;
106 if (fbdev->mem_size >= mem_size)
109 if (fbdev->mem != NULL)
110 munmap(fbdev->mem, fbdev->mem_size);
112 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
113 if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
114 fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size);
115 fbdev->buffer_count = 1;
116 mem_size = fbdev->fb_size;
117 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
119 if (fbdev->mem == MAP_FAILED) {
122 perror("mmap framebuffer");
126 fbdev->mem_size = mem_size;
130 void vout_fbdev_clear(struct vout_fbdev *fbdev)
132 memset(fbdev->mem, 0, fbdev->mem_size);
135 void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
137 int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
140 if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
141 count = fbdev->top_border + fbdev->fbvar_new.yres - y;
143 if (y >= 0 && count > 0)
144 for (i = 0; i < fbdev->buffer_count; i++)
145 memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
148 int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
153 struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf)
155 struct vout_fbdev *fbdev;
159 fbdev = calloc(1, sizeof(*fbdev));
163 fbdev->fd = open(fbdev_name, O_RDWR);
164 if (fbdev->fd == -1) {
165 fprintf(stderr, "%s: ", fbdev_name);
170 ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
172 perror("FBIOGET_VSCREENINFO ioctl");
176 fbdev->fbvar_new = fbdev->fbvar_old;
178 req_w = fbdev->fbvar_new.xres;
181 req_h = fbdev->fbvar_new.yres;
185 ret = vout_fbdev_resize(fbdev, req_w, req_h, 0, 0, 0, 0, no_dblbuf);
189 printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
190 fbdev->fbvar_new.bits_per_pixel);
191 *w = fbdev->fbvar_new.xres;
192 *h = fbdev->fbvar_new.yres;
194 memset(fbdev->mem, 0, fbdev->mem_size);
198 ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
200 fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
202 if (fbdev->buffer_count > 1) {
203 fbdev->buffer_write = 0;
204 fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
205 ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
207 fbdev->buffer_count = 1;
208 fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
212 printf("fbdev initialized.\n");
222 void vout_fbdev_finish(struct vout_fbdev *fbdev)
224 ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
225 if (fbdev->mem != MAP_FAILED)
226 munmap(fbdev->mem, fbdev->mem_size);