2 * (C) GraÅžvydas "notaz" Ignotas, 2009-2010
4 * This work is licensed under the terms of any of these licenses
6 * - GNU GPL, version 2 or later.
7 * - GNU LGPL, version 2.1 or later.
8 * See the COPYING file in the top-level directory.
14 #include <sys/types.h>
17 #include <sys/ioctl.h>
21 #include <linux/matroxfb.h>
29 struct fb_var_screeninfo fbvar_old;
30 struct fb_var_screeninfo fbvar_new;
34 int top_border, bottom_border;
37 void *vout_fbdev_flip(struct vout_fbdev *fbdev)
41 if (fbdev->buffer_count < 2)
44 draw_buf = fbdev->buffer_write;
45 fbdev->buffer_write++;
46 if (fbdev->buffer_write >= fbdev->buffer_count)
47 fbdev->buffer_write = 0;
49 fbdev->fbvar_new.yoffset =
50 (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
53 ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
55 return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
58 void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
61 ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
64 /* it is recommended to call vout_fbdev_clear() before this */
65 void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
66 int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
68 int w_total = left_border + w + right_border;
69 int h_total = top_border + h + bottom_border;
73 // unblank to be sure the mode is really accepted
74 ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
76 if (fbdev->fbvar_new.bits_per_pixel != bpp ||
77 fbdev->fbvar_new.xres != w ||
78 fbdev->fbvar_new.yres != h ||
79 fbdev->fbvar_new.xres_virtual != w_total||
80 fbdev->fbvar_new.yres_virtual < h_total ||
81 fbdev->fbvar_new.xoffset != left_border ||
82 fbdev->buffer_count != buffer_cnt)
84 if (fbdev->fbvar_new.bits_per_pixel != bpp ||
85 w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
86 printf(" switching to %dx%d@%d\n", w, h, bpp);
88 fbdev->fbvar_new.xres = w;
89 fbdev->fbvar_new.yres = h;
90 fbdev->fbvar_new.xres_virtual = w_total;
91 fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
92 fbdev->fbvar_new.xoffset = left_border;
93 fbdev->fbvar_new.yoffset = top_border;
94 fbdev->fbvar_new.bits_per_pixel = bpp;
95 fbdev->buffer_count = buffer_cnt;
96 fbdev->buffer_write = 1;
98 // seems to help a bit to avoid glitches
99 vout_fbdev_wait_vsync(fbdev);
101 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
103 // retry with no multibuffering
104 fbdev->fbvar_new.yres_virtual = h_total;
105 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
107 perror("FBIOPUT_VSCREENINFO ioctl");
110 fbdev->buffer_count = 1;
111 fbdev->buffer_write = 0;
112 fprintf(stderr, "Warning: failed to increase virtual resolution, "
113 "multibuffering disabled\n");
118 fbdev->fb_size = w_total * h_total * bpp / 8;
119 fbdev->top_border = top_border;
120 fbdev->bottom_border = bottom_border;
122 mem_size = fbdev->fb_size * fbdev->buffer_count;
123 if (fbdev->mem_size >= mem_size)
126 if (fbdev->mem != NULL)
127 munmap(fbdev->mem, fbdev->mem_size);
129 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
130 if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
131 fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
132 fbdev->buffer_count = 1;
133 fbdev->buffer_write = 0;
134 mem_size = fbdev->fb_size;
135 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
137 if (fbdev->mem == MAP_FAILED) {
140 perror("mmap framebuffer");
144 fbdev->mem_size = mem_size;
147 return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
150 void vout_fbdev_clear(struct vout_fbdev *fbdev)
152 memset(fbdev->mem, 0, fbdev->mem_size);
155 void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
157 int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
160 if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
161 count = fbdev->top_border + fbdev->fbvar_new.yres - y;
163 if (y >= 0 && count > 0)
164 for (i = 0; i < fbdev->buffer_count; i++)
165 memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
168 int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
173 struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
175 struct vout_fbdev *fbdev;
180 fbdev = calloc(1, sizeof(*fbdev));
184 fbdev->fd = open(fbdev_name, O_RDWR);
185 if (fbdev->fd == -1) {
186 fprintf(stderr, "%s: ", fbdev_name);
191 ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
193 perror("FBIOGET_VSCREENINFO ioctl");
197 fbdev->fbvar_new = fbdev->fbvar_old;
199 req_w = fbdev->fbvar_new.xres;
202 req_h = fbdev->fbvar_new.yres;
206 pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
210 printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
211 fbdev->fbvar_new.bits_per_pixel);
212 *w = fbdev->fbvar_new.xres;
213 *h = fbdev->fbvar_new.yres;
215 memset(fbdev->mem, 0, fbdev->mem_size);
219 ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
221 fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
223 if (fbdev->buffer_count > 1) {
224 fbdev->buffer_write = 0;
225 fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
226 ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
228 fbdev->buffer_count = 1;
229 fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
233 printf("fbdev initialized.\n");
243 void vout_fbdev_finish(struct vout_fbdev *fbdev)
245 ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
246 if (fbdev->mem != MAP_FAILED)
247 munmap(fbdev->mem, fbdev->mem_size);