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.
9 * See the COPYING file in the top-level directory.
15 #include <sys/types.h>
18 #include <sys/ioctl.h>
22 #include <linux/matroxfb.h>
32 struct fb_var_screeninfo fbvar_old;
33 struct fb_var_screeninfo fbvar_new;
37 int top_border, bottom_border;
39 size_t mem_saved_size;
42 void *vout_fbdev_flip(struct vout_fbdev *fbdev)
46 if (fbdev->buffer_count < 2)
49 draw_buf = fbdev->buffer_write;
50 fbdev->buffer_write++;
51 if (fbdev->buffer_write >= fbdev->buffer_count)
52 fbdev->buffer_write = 0;
54 fbdev->fbvar_new.yoffset =
55 (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
58 ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
60 return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
63 void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
66 ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
69 /* it is recommended to call vout_fbdev_clear() before this */
70 void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
71 int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
73 int w_total = left_border + w + right_border;
74 int h_total = top_border + h + bottom_border;
78 // unblank to be sure the mode is really accepted
79 ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
81 if (fbdev->fbvar_new.bits_per_pixel != bpp ||
82 fbdev->fbvar_new.xres != w ||
83 fbdev->fbvar_new.yres != h ||
84 fbdev->fbvar_new.xres_virtual != w_total||
85 fbdev->fbvar_new.yres_virtual < h_total ||
86 fbdev->fbvar_new.xoffset != left_border ||
87 fbdev->buffer_count != buffer_cnt)
89 if (fbdev->fbvar_new.bits_per_pixel != bpp ||
90 w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
91 printf(PFX "switching to %dx%d@%d\n", w, h, bpp);
93 fbdev->fbvar_new.xres = w;
94 fbdev->fbvar_new.yres = h;
95 fbdev->fbvar_new.xres_virtual = w_total;
96 fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
97 fbdev->fbvar_new.xoffset = left_border;
98 fbdev->fbvar_new.yoffset = top_border;
99 fbdev->fbvar_new.bits_per_pixel = bpp;
100 fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
101 fbdev->buffer_count = buffer_cnt;
102 fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;
104 // seems to help a bit to avoid glitches
105 vout_fbdev_wait_vsync(fbdev);
107 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
109 // retry with no multibuffering
110 fbdev->fbvar_new.yres_virtual = h_total;
111 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
113 perror(PFX "FBIOPUT_VSCREENINFO ioctl");
116 fbdev->buffer_count = 1;
117 fbdev->buffer_write = 0;
118 fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
119 "multibuffering disabled\n");
124 fbdev->fb_size = w_total * h_total * bpp / 8;
125 fbdev->top_border = top_border;
126 fbdev->bottom_border = bottom_border;
128 mem_size = fbdev->fb_size * fbdev->buffer_count;
129 if (fbdev->mem_size >= mem_size)
132 if (fbdev->mem != NULL)
133 munmap(fbdev->mem, fbdev->mem_size);
135 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
136 if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
137 fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
138 fbdev->buffer_count = 1;
139 fbdev->buffer_write = 0;
140 mem_size = fbdev->fb_size;
141 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
143 if (fbdev->mem == MAP_FAILED) {
146 perror(PFX "mmap framebuffer");
150 fbdev->mem_size = mem_size;
153 return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
156 void vout_fbdev_clear(struct vout_fbdev *fbdev)
158 memset(fbdev->mem, 0, fbdev->mem_size);
161 void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
163 int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
166 if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
167 count = fbdev->top_border + fbdev->fbvar_new.yres - y;
169 if (y >= 0 && count > 0)
170 for (i = 0; i < fbdev->buffer_count; i++)
171 memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
174 int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
179 struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
181 struct vout_fbdev *fbdev;
186 fbdev = calloc(1, sizeof(*fbdev));
190 fbdev->fd = open(fbdev_name, O_RDWR);
191 if (fbdev->fd == -1) {
192 fprintf(stderr, PFX "%s: ", fbdev_name);
197 ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
199 perror(PFX "FBIOGET_VSCREENINFO ioctl");
203 fbdev->fbvar_new = fbdev->fbvar_old;
205 req_w = fbdev->fbvar_new.xres;
208 req_h = fbdev->fbvar_new.yres;
212 pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
216 printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
217 fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
218 *w = fbdev->fbvar_new.xres;
219 *h = fbdev->fbvar_new.yres;
221 memset(fbdev->mem, 0, fbdev->mem_size);
225 ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
227 fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");
229 if (fbdev->buffer_count > 1) {
230 fbdev->buffer_write = 0;
231 fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
232 ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
234 fbdev->buffer_count = 1;
235 fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
239 printf("fbdev initialized.\n");
249 static void vout_fbdev_release(struct vout_fbdev *fbdev)
251 ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
252 if (fbdev->mem != MAP_FAILED)
253 munmap(fbdev->mem, fbdev->mem_size);
257 int vout_fbdev_save(struct vout_fbdev *fbdev)
261 if (fbdev == NULL || fbdev->mem == NULL || fbdev->mem == MAP_FAILED) {
262 fprintf(stderr, PFX "bad args for save\n");
266 if (fbdev->mem_saved_size < fbdev->mem_size) {
267 tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
270 fbdev->mem_saved = tmp;
272 memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
273 fbdev->mem_saved_size = fbdev->mem_size;
275 vout_fbdev_release(fbdev);
279 int vout_fbdev_restore(struct vout_fbdev *fbdev)
283 if (fbdev == NULL || fbdev->mem != NULL) {
284 fprintf(stderr, PFX "bad args/state for restore\n");
288 fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
289 if (fbdev->mem == MAP_FAILED) {
290 perror(PFX "restore: memory restore failed");
293 memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);
295 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
297 perror(PFX "restore: FBIOPUT_VSCREENINFO");
304 void vout_fbdev_finish(struct vout_fbdev *fbdev)
306 vout_fbdev_release(fbdev);