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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 | |
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11 | #include <stdio.h> |
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12 | #include <stdlib.h> |
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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 | |
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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; |
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32 | int fb_size; |
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33 | int buffer_count; |
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34 | int top_border, bottom_border; |
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35 | }; |
36 | |
37 | void *vout_fbdev_flip(struct vout_fbdev *fbdev) |
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38 | { |
39 | int draw_buf; |
40 | |
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41 | if (fbdev->buffer_count < 2) |
42 | return fbdev->mem; |
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43 | |
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44 | draw_buf = fbdev->buffer_write; |
45 | fbdev->buffer_write++; |
46 | if (fbdev->buffer_write >= fbdev->buffer_count) |
47 | fbdev->buffer_write = 0; |
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48 | |
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49 | fbdev->fbvar_new.yoffset = |
50 | (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf + |
51 | fbdev->top_border; |
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52 | |
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53 | ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
54 | |
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55 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
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56 | } |
57 | |
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58 | void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev) |
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59 | { |
60 | int arg = 0; |
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61 | ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg); |
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62 | } |
63 | |
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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, |
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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 | 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) |
83 | { |
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); |
87 | |
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88 | fbdev->fbvar_new.xres = w; |
89 | fbdev->fbvar_new.yres = h; |
90 | fbdev->fbvar_new.xres_virtual = w_total; |
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91 | fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt; |
207e58ef |
92 | fbdev->fbvar_new.xoffset = left_border; |
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93 | fbdev->fbvar_new.yoffset = top_border; |
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94 | fbdev->fbvar_new.bits_per_pixel = bpp; |
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95 | fbdev->buffer_count = buffer_cnt; |
96 | fbdev->buffer_write = 1; |
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97 | |
98 | // seems to help a bit to avoid glitches |
99 | vout_fbdev_wait_vsync(fbdev); |
100 | |
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101 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
102 | if (ret == -1) { |
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103 | // retry with no multibuffering |
104 | fbdev->fbvar_new.yres_virtual = h_total; |
105 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
106 | if (ret == -1) { |
107 | perror("FBIOPUT_VSCREENINFO ioctl"); |
108 | return NULL; |
109 | } |
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110 | fbdev->buffer_count = 1; |
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111 | fbdev->buffer_write = 0; |
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112 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
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113 | "multibuffering disabled\n"); |
207e58ef |
114 | } |
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115 | |
207e58ef |
116 | } |
117 | |
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118 | fbdev->fb_size = w_total * h_total * bpp / 8; |
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119 | fbdev->top_border = top_border; |
120 | fbdev->bottom_border = bottom_border; |
121 | |
122 | mem_size = fbdev->fb_size * fbdev->buffer_count; |
123 | if (fbdev->mem_size >= mem_size) |
0238dca9 |
124 | goto out; |
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125 | |
126 | if (fbdev->mem != NULL) |
127 | munmap(fbdev->mem, fbdev->mem_size); |
128 | |
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) { |
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131 | fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size); |
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132 | fbdev->buffer_count = 1; |
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133 | fbdev->buffer_write = 0; |
207e58ef |
134 | mem_size = fbdev->fb_size; |
135 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
136 | } |
137 | if (fbdev->mem == MAP_FAILED) { |
138 | fbdev->mem = NULL; |
139 | fbdev->mem_size = 0; |
140 | perror("mmap framebuffer"); |
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141 | return NULL; |
207e58ef |
142 | } |
143 | |
144 | fbdev->mem_size = mem_size; |
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145 | |
146 | out: |
147 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
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148 | } |
149 | |
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150 | void vout_fbdev_clear(struct vout_fbdev *fbdev) |
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151 | { |
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152 | memset(fbdev->mem, 0, fbdev->mem_size); |
153 | } |
154 | |
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155 | void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count) |
156 | { |
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157 | int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8; |
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158 | int i; |
159 | |
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160 | if (y + count > fbdev->top_border + fbdev->fbvar_new.yres) |
161 | count = fbdev->top_border + fbdev->fbvar_new.yres - y; |
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162 | |
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); |
166 | } |
167 | |
168 | int vout_fbdev_get_fd(struct vout_fbdev *fbdev) |
169 | { |
170 | return fbdev->fd; |
171 | } |
172 | |
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173 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt) |
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174 | { |
175 | struct vout_fbdev *fbdev; |
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176 | int req_w, req_h; |
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177 | void *pret; |
207e58ef |
178 | int ret; |
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179 | |
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180 | fbdev = calloc(1, sizeof(*fbdev)); |
181 | if (fbdev == NULL) |
182 | return NULL; |
183 | |
184 | fbdev->fd = open(fbdev_name, O_RDWR); |
185 | if (fbdev->fd == -1) { |
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186 | fprintf(stderr, "%s: ", fbdev_name); |
187 | perror("open"); |
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188 | goto fail_open; |
d08e7326 |
189 | } |
190 | |
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191 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
d08e7326 |
192 | if (ret == -1) { |
193 | perror("FBIOGET_VSCREENINFO ioctl"); |
194 | goto fail; |
195 | } |
196 | |
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197 | fbdev->fbvar_new = fbdev->fbvar_old; |
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198 | |
207e58ef |
199 | req_w = fbdev->fbvar_new.xres; |
200 | if (*w != 0) |
201 | req_w = *w; |
202 | req_h = fbdev->fbvar_new.yres; |
203 | if (*h != 0) |
204 | req_h = *h; |
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205 | |
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206 | pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt); |
207 | if (pret == NULL) |
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208 | goto fail; |
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209 | |
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; |
214 | |
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215 | memset(fbdev->mem, 0, fbdev->mem_size); |
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216 | |
217 | // some checks |
218 | ret = 0; |
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219 | ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret); |
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220 | if (ret != 0) |
221 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
222 | |
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223 | if (fbdev->buffer_count > 1) { |
224 | fbdev->buffer_write = 0; |
207e58ef |
225 | fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1); |
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226 | ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
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227 | if (ret != 0) { |
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228 | fbdev->buffer_count = 1; |
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229 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
230 | } |
231 | } |
232 | |
233 | printf("fbdev initialized.\n"); |
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234 | return fbdev; |
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235 | |
236 | fail: |
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237 | close(fbdev->fd); |
238 | fail_open: |
239 | free(fbdev); |
240 | return NULL; |
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241 | } |
242 | |
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243 | void vout_fbdev_finish(struct vout_fbdev *fbdev) |
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244 | { |
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245 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
246 | if (fbdev->mem != MAP_FAILED) |
247 | munmap(fbdev->mem, fbdev->mem_size); |
248 | if (fbdev->fd >= 0) |
249 | close(fbdev->fd); |
250 | fbdev->mem = NULL; |
251 | fbdev->fd = -1; |
252 | free(fbdev); |
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253 | } |
254 | |