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1 | /* |
2 | * (C) GraÅžvydas "notaz" Ignotas, 2009-2010 |
3 | * |
698517be |
4 | * This work is licensed under the terms of any of these licenses |
5 | * (at your option): |
6 | * - GNU GPL, version 2 or later. |
7 | * - GNU LGPL, version 2.1 or later. |
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8 | * See the COPYING file in the top-level directory. |
9 | */ |
10 | |
11 | #include <stdio.h> |
12 | #include <stdlib.h> |
13 | #include <string.h> |
14 | #include <sys/types.h> |
15 | #include <sys/stat.h> |
16 | #include <fcntl.h> |
17 | #include <sys/ioctl.h> |
18 | #include <sys/mman.h> |
19 | #include <unistd.h> |
20 | #include <linux/fb.h> |
21 | #include <linux/matroxfb.h> |
22 | |
23 | #include "fbdev.h" |
24 | |
3a321131 |
25 | #define PFX "fbdev: " |
26 | |
b60f2812 |
27 | struct vout_fbdev { |
28 | int fd; |
29 | void *mem; |
30 | size_t mem_size; |
31 | struct fb_var_screeninfo fbvar_old; |
32 | struct fb_var_screeninfo fbvar_new; |
33 | int buffer_write; |
34 | int fb_size; |
35 | int buffer_count; |
36 | int top_border, bottom_border; |
3a321131 |
37 | void *mem_saved; |
38 | size_t mem_saved_size; |
b60f2812 |
39 | }; |
40 | |
41 | void *vout_fbdev_flip(struct vout_fbdev *fbdev) |
42 | { |
43 | int draw_buf; |
44 | |
45 | if (fbdev->buffer_count < 2) |
46 | return fbdev->mem; |
47 | |
48 | draw_buf = fbdev->buffer_write; |
49 | fbdev->buffer_write++; |
50 | if (fbdev->buffer_write >= fbdev->buffer_count) |
51 | fbdev->buffer_write = 0; |
52 | |
53 | fbdev->fbvar_new.yoffset = |
54 | (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf + |
55 | fbdev->top_border; |
56 | |
57 | ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
58 | |
59 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
60 | } |
61 | |
62 | void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev) |
63 | { |
64 | int arg = 0; |
65 | ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg); |
66 | } |
67 | |
d352cde2 |
68 | /* it is recommended to call vout_fbdev_clear() before this */ |
69 | void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp, |
1972732a |
70 | int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt) |
b60f2812 |
71 | { |
72 | int w_total = left_border + w + right_border; |
73 | int h_total = top_border + h + bottom_border; |
74 | size_t mem_size; |
75 | int ret; |
76 | |
77 | // unblank to be sure the mode is really accepted |
78 | ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK); |
79 | |
1972732a |
80 | if (fbdev->fbvar_new.bits_per_pixel != bpp || |
e0ff987c |
81 | fbdev->fbvar_new.xres != w || |
82 | fbdev->fbvar_new.yres != h || |
83 | fbdev->fbvar_new.xres_virtual != w_total|| |
84 | fbdev->fbvar_new.yres_virtual < h_total || |
85 | fbdev->fbvar_new.xoffset != left_border || |
86 | fbdev->buffer_count != buffer_cnt) |
87 | { |
88 | if (fbdev->fbvar_new.bits_per_pixel != bpp || |
89 | w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres) |
3a321131 |
90 | printf(PFX "switching to %dx%d@%d\n", w, h, bpp); |
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91 | |
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92 | fbdev->fbvar_new.xres = w; |
93 | fbdev->fbvar_new.yres = h; |
94 | fbdev->fbvar_new.xres_virtual = w_total; |
e0ff987c |
95 | fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt; |
b60f2812 |
96 | fbdev->fbvar_new.xoffset = left_border; |
d352cde2 |
97 | fbdev->fbvar_new.yoffset = top_border; |
1972732a |
98 | fbdev->fbvar_new.bits_per_pixel = bpp; |
a33a15fd |
99 | fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb |
e0ff987c |
100 | fbdev->buffer_count = buffer_cnt; |
ffbe7a39 |
101 | fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0; |
d352cde2 |
102 | |
103 | // seems to help a bit to avoid glitches |
104 | vout_fbdev_wait_vsync(fbdev); |
105 | |
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106 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
107 | if (ret == -1) { |
e0ff987c |
108 | // retry with no multibuffering |
109 | fbdev->fbvar_new.yres_virtual = h_total; |
110 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
111 | if (ret == -1) { |
3a321131 |
112 | perror(PFX "FBIOPUT_VSCREENINFO ioctl"); |
e0ff987c |
113 | return NULL; |
114 | } |
b60f2812 |
115 | fbdev->buffer_count = 1; |
d352cde2 |
116 | fbdev->buffer_write = 0; |
3a321131 |
117 | fprintf(stderr, PFX "Warning: failed to increase virtual resolution, " |
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118 | "multibuffering disabled\n"); |
b60f2812 |
119 | } |
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120 | |
b60f2812 |
121 | } |
122 | |
1972732a |
123 | fbdev->fb_size = w_total * h_total * bpp / 8; |
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124 | fbdev->top_border = top_border; |
125 | fbdev->bottom_border = bottom_border; |
126 | |
127 | mem_size = fbdev->fb_size * fbdev->buffer_count; |
128 | if (fbdev->mem_size >= mem_size) |
d352cde2 |
129 | goto out; |
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130 | |
131 | if (fbdev->mem != NULL) |
132 | munmap(fbdev->mem, fbdev->mem_size); |
133 | |
134 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
135 | if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) { |
3a321131 |
136 | fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size); |
b60f2812 |
137 | fbdev->buffer_count = 1; |
2cb46552 |
138 | fbdev->buffer_write = 0; |
b60f2812 |
139 | mem_size = fbdev->fb_size; |
140 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
141 | } |
142 | if (fbdev->mem == MAP_FAILED) { |
143 | fbdev->mem = NULL; |
144 | fbdev->mem_size = 0; |
3a321131 |
145 | perror(PFX "mmap framebuffer"); |
d352cde2 |
146 | return NULL; |
b60f2812 |
147 | } |
148 | |
149 | fbdev->mem_size = mem_size; |
d352cde2 |
150 | |
151 | out: |
152 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
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153 | } |
154 | |
155 | void vout_fbdev_clear(struct vout_fbdev *fbdev) |
156 | { |
157 | memset(fbdev->mem, 0, fbdev->mem_size); |
158 | } |
159 | |
160 | void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count) |
161 | { |
162 | int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8; |
163 | int i; |
164 | |
165 | if (y + count > fbdev->top_border + fbdev->fbvar_new.yres) |
166 | count = fbdev->top_border + fbdev->fbvar_new.yres - y; |
167 | |
168 | if (y >= 0 && count > 0) |
169 | for (i = 0; i < fbdev->buffer_count; i++) |
170 | memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count); |
171 | } |
172 | |
173 | int vout_fbdev_get_fd(struct vout_fbdev *fbdev) |
174 | { |
175 | return fbdev->fd; |
176 | } |
177 | |
1972732a |
178 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt) |
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179 | { |
180 | struct vout_fbdev *fbdev; |
181 | int req_w, req_h; |
d352cde2 |
182 | void *pret; |
b60f2812 |
183 | int ret; |
184 | |
185 | fbdev = calloc(1, sizeof(*fbdev)); |
186 | if (fbdev == NULL) |
187 | return NULL; |
188 | |
189 | fbdev->fd = open(fbdev_name, O_RDWR); |
190 | if (fbdev->fd == -1) { |
3a321131 |
191 | fprintf(stderr, PFX "%s: ", fbdev_name); |
b60f2812 |
192 | perror("open"); |
193 | goto fail_open; |
194 | } |
195 | |
196 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
197 | if (ret == -1) { |
3a321131 |
198 | perror(PFX "FBIOGET_VSCREENINFO ioctl"); |
b60f2812 |
199 | goto fail; |
200 | } |
201 | |
202 | fbdev->fbvar_new = fbdev->fbvar_old; |
203 | |
204 | req_w = fbdev->fbvar_new.xres; |
205 | if (*w != 0) |
206 | req_w = *w; |
207 | req_h = fbdev->fbvar_new.yres; |
208 | if (*h != 0) |
209 | req_h = *h; |
210 | |
d352cde2 |
211 | pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt); |
212 | if (pret == NULL) |
b60f2812 |
213 | goto fail; |
214 | |
3a321131 |
215 | printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, |
216 | fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel); |
b60f2812 |
217 | *w = fbdev->fbvar_new.xres; |
218 | *h = fbdev->fbvar_new.yres; |
219 | |
220 | memset(fbdev->mem, 0, fbdev->mem_size); |
221 | |
222 | // some checks |
223 | ret = 0; |
224 | ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret); |
225 | if (ret != 0) |
3a321131 |
226 | fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n"); |
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227 | |
228 | if (fbdev->buffer_count > 1) { |
229 | fbdev->buffer_write = 0; |
230 | fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1); |
231 | ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
232 | if (ret != 0) { |
233 | fbdev->buffer_count = 1; |
3a321131 |
234 | fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n"); |
b60f2812 |
235 | } |
236 | } |
237 | |
238 | printf("fbdev initialized.\n"); |
239 | return fbdev; |
240 | |
241 | fail: |
242 | close(fbdev->fd); |
243 | fail_open: |
244 | free(fbdev); |
245 | return NULL; |
246 | } |
247 | |
3a321131 |
248 | static void vout_fbdev_release(struct vout_fbdev *fbdev) |
b60f2812 |
249 | { |
250 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
251 | if (fbdev->mem != MAP_FAILED) |
252 | munmap(fbdev->mem, fbdev->mem_size); |
3a321131 |
253 | fbdev->mem = NULL; |
254 | } |
255 | |
256 | int vout_fbdev_save(struct vout_fbdev *fbdev) |
257 | { |
258 | void *tmp; |
259 | |
260 | if (fbdev == NULL || fbdev->mem == NULL || fbdev->mem == MAP_FAILED) { |
261 | fprintf(stderr, PFX "bad args for save\n"); |
262 | return -1; |
263 | } |
264 | |
265 | if (fbdev->mem_saved_size < fbdev->mem_size) { |
266 | tmp = realloc(fbdev->mem_saved, fbdev->mem_size); |
267 | if (tmp == NULL) |
268 | return -1; |
269 | fbdev->mem_saved = tmp; |
270 | } |
271 | memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size); |
272 | fbdev->mem_saved_size = fbdev->mem_size; |
273 | |
274 | vout_fbdev_release(fbdev); |
275 | return 0; |
276 | } |
277 | |
278 | int vout_fbdev_restore(struct vout_fbdev *fbdev) |
279 | { |
280 | int ret; |
281 | |
282 | if (fbdev == NULL || fbdev->mem != NULL) { |
283 | fprintf(stderr, PFX "bad args/state for restore\n"); |
284 | return -1; |
285 | } |
286 | |
287 | fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
288 | if (fbdev->mem == MAP_FAILED) { |
289 | perror(PFX "restore: memory restore failed"); |
290 | return -1; |
291 | } |
292 | memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size); |
293 | |
294 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
295 | if (ret == -1) { |
296 | perror(PFX "restore: FBIOPUT_VSCREENINFO"); |
297 | return -1; |
298 | } |
299 | |
300 | return 0; |
301 | } |
302 | |
303 | void vout_fbdev_finish(struct vout_fbdev *fbdev) |
304 | { |
305 | vout_fbdev_release(fbdev); |
b60f2812 |
306 | if (fbdev->fd >= 0) |
307 | close(fbdev->fd); |
b60f2812 |
308 | fbdev->fd = -1; |
309 | free(fbdev); |
310 | } |
311 | |