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->fbvar_new.nonstd = 0; // can set YUV here on omapfb
96 fbdev->buffer_count = buffer_cnt;
97 fbdev->buffer_write = 1;
99 // seems to help a bit to avoid glitches
100 vout_fbdev_wait_vsync(fbdev);
102 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
104 // retry with no multibuffering
105 fbdev->fbvar_new.yres_virtual = h_total;
106 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
108 perror("FBIOPUT_VSCREENINFO ioctl");
111 fbdev->buffer_count = 1;
112 fbdev->buffer_write = 0;
113 fprintf(stderr, "Warning: failed to increase virtual resolution, "
114 "multibuffering disabled\n");
119 fbdev->fb_size = w_total * h_total * bpp / 8;
120 fbdev->top_border = top_border;
121 fbdev->bottom_border = bottom_border;
123 mem_size = fbdev->fb_size * fbdev->buffer_count;
124 if (fbdev->mem_size >= mem_size)
127 if (fbdev->mem != NULL)
128 munmap(fbdev->mem, fbdev->mem_size);
130 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
131 if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
132 fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
133 fbdev->buffer_count = 1;
134 fbdev->buffer_write = 0;
135 mem_size = fbdev->fb_size;
136 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
138 if (fbdev->mem == MAP_FAILED) {
141 perror("mmap framebuffer");
145 fbdev->mem_size = mem_size;
148 return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
151 void vout_fbdev_clear(struct vout_fbdev *fbdev)
153 memset(fbdev->mem, 0, fbdev->mem_size);
156 void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
158 int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
161 if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
162 count = fbdev->top_border + fbdev->fbvar_new.yres - y;
164 if (y >= 0 && count > 0)
165 for (i = 0; i < fbdev->buffer_count; i++)
166 memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
169 int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
174 struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
176 struct vout_fbdev *fbdev;
181 fbdev = calloc(1, sizeof(*fbdev));
185 fbdev->fd = open(fbdev_name, O_RDWR);
186 if (fbdev->fd == -1) {
187 fprintf(stderr, "%s: ", fbdev_name);
192 ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
194 perror("FBIOGET_VSCREENINFO ioctl");
198 fbdev->fbvar_new = fbdev->fbvar_old;
200 req_w = fbdev->fbvar_new.xres;
203 req_h = fbdev->fbvar_new.yres;
207 pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
211 printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
212 fbdev->fbvar_new.bits_per_pixel);
213 *w = fbdev->fbvar_new.xres;
214 *h = fbdev->fbvar_new.yres;
216 memset(fbdev->mem, 0, fbdev->mem_size);
220 ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
222 fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
224 if (fbdev->buffer_count > 1) {
225 fbdev->buffer_write = 0;
226 fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
227 ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
229 fbdev->buffer_count = 1;
230 fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
234 printf("fbdev initialized.\n");
244 void vout_fbdev_finish(struct vout_fbdev *fbdev)
246 ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
247 if (fbdev->mem != MAP_FAILED)
248 munmap(fbdev->mem, fbdev->mem_size);