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1 | /* |
2 | * (C) GraÅžvydas "notaz" Ignotas, 2009-2010 |
3 | * |
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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 | |
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25 | struct vout_fbdev { |
26 | int fd; |
27 | void *mem; |
28 | size_t mem_size; |
29 | struct fb_var_screeninfo fbvar_old; |
30 | struct fb_var_screeninfo fbvar_new; |
31 | int buffer_write; |
32 | int fb_size; |
33 | int buffer_count; |
34 | int top_border, bottom_border; |
35 | }; |
36 | |
37 | void *vout_fbdev_flip(struct vout_fbdev *fbdev) |
38 | { |
39 | int draw_buf; |
40 | |
41 | if (fbdev->buffer_count < 2) |
42 | return fbdev->mem; |
43 | |
44 | draw_buf = fbdev->buffer_write; |
45 | fbdev->buffer_write++; |
46 | if (fbdev->buffer_write >= fbdev->buffer_count) |
47 | fbdev->buffer_write = 0; |
48 | |
49 | fbdev->fbvar_new.yoffset = |
50 | (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf + |
51 | fbdev->top_border; |
52 | |
53 | ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
54 | |
55 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
56 | } |
57 | |
58 | void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev) |
59 | { |
60 | int arg = 0; |
61 | ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg); |
62 | } |
63 | |
d352cde2 |
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, |
1972732a |
66 | int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt) |
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67 | { |
68 | int w_total = left_border + w + right_border; |
69 | int h_total = top_border + h + bottom_border; |
70 | size_t mem_size; |
71 | int ret; |
72 | |
73 | // unblank to be sure the mode is really accepted |
74 | ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK); |
75 | |
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76 | if (fbdev->fbvar_new.bits_per_pixel != bpp || |
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77 | w != fbdev->fbvar_new.xres || |
78 | h != fbdev->fbvar_new.yres || |
79 | w_total != fbdev->fbvar_new.xres_virtual || |
80 | h_total > fbdev->fbvar_new.yres_virtual || |
81 | left_border != fbdev->fbvar_new.xoffset) { |
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; |
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87 | fbdev->fbvar_new.yoffset = top_border; |
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88 | fbdev->fbvar_new.bits_per_pixel = bpp; |
89 | printf(" switching to %dx%d@%d\n", w, h, bpp); |
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90 | |
91 | // seems to help a bit to avoid glitches |
92 | vout_fbdev_wait_vsync(fbdev); |
93 | |
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94 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
95 | if (ret == -1) { |
96 | perror("FBIOPUT_VSCREENINFO ioctl"); |
d352cde2 |
97 | return NULL; |
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98 | } |
d352cde2 |
99 | |
100 | fbdev->buffer_write = 1; |
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101 | } |
102 | |
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103 | fbdev->buffer_count = buffer_cnt; |
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104 | |
105 | if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) { |
106 | fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count; |
107 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
108 | if (ret == -1) { |
109 | fbdev->buffer_count = 1; |
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110 | fbdev->buffer_write = 0; |
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111 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
112 | "doublebuffering disabled\n"); |
113 | } |
114 | } |
115 | |
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116 | fbdev->fb_size = w_total * h_total * bpp / 8; |
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117 | fbdev->top_border = top_border; |
118 | fbdev->bottom_border = bottom_border; |
119 | |
120 | mem_size = fbdev->fb_size * fbdev->buffer_count; |
121 | if (fbdev->mem_size >= mem_size) |
d352cde2 |
122 | goto out; |
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123 | |
124 | if (fbdev->mem != NULL) |
125 | munmap(fbdev->mem, fbdev->mem_size); |
126 | |
127 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
128 | if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) { |
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129 | fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size); |
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130 | fbdev->buffer_count = 1; |
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131 | fbdev->buffer_write = 0; |
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132 | mem_size = fbdev->fb_size; |
133 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
134 | } |
135 | if (fbdev->mem == MAP_FAILED) { |
136 | fbdev->mem = NULL; |
137 | fbdev->mem_size = 0; |
138 | perror("mmap framebuffer"); |
d352cde2 |
139 | return NULL; |
b60f2812 |
140 | } |
141 | |
142 | fbdev->mem_size = mem_size; |
d352cde2 |
143 | |
144 | out: |
145 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
b60f2812 |
146 | } |
147 | |
148 | void vout_fbdev_clear(struct vout_fbdev *fbdev) |
149 | { |
150 | memset(fbdev->mem, 0, fbdev->mem_size); |
151 | } |
152 | |
153 | void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count) |
154 | { |
155 | int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8; |
156 | int i; |
157 | |
158 | if (y + count > fbdev->top_border + fbdev->fbvar_new.yres) |
159 | count = fbdev->top_border + fbdev->fbvar_new.yres - y; |
160 | |
161 | if (y >= 0 && count > 0) |
162 | for (i = 0; i < fbdev->buffer_count; i++) |
163 | memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count); |
164 | } |
165 | |
166 | int vout_fbdev_get_fd(struct vout_fbdev *fbdev) |
167 | { |
168 | return fbdev->fd; |
169 | } |
170 | |
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171 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt) |
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172 | { |
173 | struct vout_fbdev *fbdev; |
174 | int req_w, req_h; |
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175 | void *pret; |
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176 | int ret; |
177 | |
178 | fbdev = calloc(1, sizeof(*fbdev)); |
179 | if (fbdev == NULL) |
180 | return NULL; |
181 | |
182 | fbdev->fd = open(fbdev_name, O_RDWR); |
183 | if (fbdev->fd == -1) { |
184 | fprintf(stderr, "%s: ", fbdev_name); |
185 | perror("open"); |
186 | goto fail_open; |
187 | } |
188 | |
189 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
190 | if (ret == -1) { |
191 | perror("FBIOGET_VSCREENINFO ioctl"); |
192 | goto fail; |
193 | } |
194 | |
195 | fbdev->fbvar_new = fbdev->fbvar_old; |
196 | |
197 | req_w = fbdev->fbvar_new.xres; |
198 | if (*w != 0) |
199 | req_w = *w; |
200 | req_h = fbdev->fbvar_new.yres; |
201 | if (*h != 0) |
202 | req_h = *h; |
203 | |
d352cde2 |
204 | pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt); |
205 | if (pret == NULL) |
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206 | goto fail; |
207 | |
208 | printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres, |
209 | fbdev->fbvar_new.bits_per_pixel); |
210 | *w = fbdev->fbvar_new.xres; |
211 | *h = fbdev->fbvar_new.yres; |
212 | |
213 | memset(fbdev->mem, 0, fbdev->mem_size); |
214 | |
215 | // some checks |
216 | ret = 0; |
217 | ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret); |
218 | if (ret != 0) |
219 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
220 | |
221 | if (fbdev->buffer_count > 1) { |
222 | fbdev->buffer_write = 0; |
223 | fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1); |
224 | ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
225 | if (ret != 0) { |
226 | fbdev->buffer_count = 1; |
227 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
228 | } |
229 | } |
230 | |
231 | printf("fbdev initialized.\n"); |
232 | return fbdev; |
233 | |
234 | fail: |
235 | close(fbdev->fd); |
236 | fail_open: |
237 | free(fbdev); |
238 | return NULL; |
239 | } |
240 | |
241 | void vout_fbdev_finish(struct vout_fbdev *fbdev) |
242 | { |
243 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
244 | if (fbdev->mem != MAP_FAILED) |
245 | munmap(fbdev->mem, fbdev->mem_size); |
246 | if (fbdev->fd >= 0) |
247 | close(fbdev->fd); |
248 | fbdev->mem = NULL; |
249 | fbdev->fd = -1; |
250 | free(fbdev); |
251 | } |
252 | |