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1 | #include <stdio.h> |
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2 | #include <stdlib.h> |
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3 | #include <string.h> |
4 | #include <sys/types.h> |
5 | #include <sys/stat.h> |
6 | #include <fcntl.h> |
7 | #include <sys/ioctl.h> |
8 | #include <sys/mman.h> |
9 | #include <unistd.h> |
10 | #include <linux/fb.h> |
11 | #include <linux/matroxfb.h> |
12 | |
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13 | #include "fbdev.h" |
14 | |
15 | #define FBDEV_MAX_BUFFERS 3 |
16 | |
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17 | struct vout_fbdev { |
18 | int fd; |
19 | void *mem; |
20 | size_t mem_size; |
21 | struct fb_var_screeninfo fbvar_old; |
22 | struct fb_var_screeninfo fbvar_new; |
23 | int buffer_write; |
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24 | int fb_size; |
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25 | int buffer_count; |
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26 | int top_border, bottom_border; |
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27 | }; |
28 | |
29 | void *vout_fbdev_flip(struct vout_fbdev *fbdev) |
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30 | { |
31 | int draw_buf; |
32 | |
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33 | if (fbdev->buffer_count < 2) |
34 | return fbdev->mem; |
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35 | |
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36 | draw_buf = fbdev->buffer_write; |
37 | fbdev->buffer_write++; |
38 | if (fbdev->buffer_write >= fbdev->buffer_count) |
39 | fbdev->buffer_write = 0; |
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40 | |
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41 | fbdev->fbvar_new.yoffset = |
42 | (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf + |
43 | fbdev->top_border; |
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44 | |
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45 | ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
46 | |
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47 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
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48 | } |
49 | |
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50 | void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev) |
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51 | { |
52 | int arg = 0; |
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53 | ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg); |
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54 | } |
55 | |
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56 | int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, |
57 | int left_border, int right_border, int top_border, int bottom_border, int no_dblbuf) |
58 | { |
59 | int w_total = left_border + w + right_border; |
60 | int h_total = top_border + h + bottom_border; |
61 | size_t mem_size; |
62 | int ret; |
63 | |
64 | // unblank to be sure the mode is really accepted |
65 | ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK); |
66 | |
67 | if (fbdev->fbvar_new.bits_per_pixel != 16 || |
68 | w != fbdev->fbvar_new.xres || |
69 | h != fbdev->fbvar_new.yres || |
70 | w_total != fbdev->fbvar_new.xres_virtual || |
71 | h_total > fbdev->fbvar_new.yres_virtual || |
72 | left_border != fbdev->fbvar_new.xoffset) { |
73 | fbdev->fbvar_new.xres = w; |
74 | fbdev->fbvar_new.yres = h; |
75 | fbdev->fbvar_new.xres_virtual = w_total; |
76 | fbdev->fbvar_new.yres_virtual = h_total; |
77 | fbdev->fbvar_new.xoffset = left_border; |
78 | fbdev->fbvar_new.bits_per_pixel = 16; |
79 | printf(" switching to %dx%d@16\n", w, h); |
80 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
81 | if (ret == -1) { |
82 | perror("FBIOPUT_VSCREENINFO ioctl"); |
83 | return -1; |
84 | } |
85 | } |
86 | |
87 | fbdev->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic |
88 | if (no_dblbuf) |
89 | fbdev->buffer_count = 1; |
90 | |
91 | if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) { |
92 | fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count; |
93 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
94 | if (ret == -1) { |
95 | fbdev->buffer_count = 1; |
96 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
97 | "doublebuffering disabled\n"); |
98 | } |
99 | } |
100 | |
101 | fbdev->fb_size = w_total * h_total * 2; |
102 | fbdev->top_border = top_border; |
103 | fbdev->bottom_border = bottom_border; |
104 | |
105 | mem_size = fbdev->fb_size * fbdev->buffer_count; |
106 | if (fbdev->mem_size >= mem_size) |
107 | return 0; |
108 | |
109 | if (fbdev->mem != NULL) |
110 | munmap(fbdev->mem, fbdev->mem_size); |
111 | |
112 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
113 | if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) { |
114 | fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size); |
115 | fbdev->buffer_count = 1; |
116 | mem_size = fbdev->fb_size; |
117 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
118 | } |
119 | if (fbdev->mem == MAP_FAILED) { |
120 | fbdev->mem = NULL; |
121 | fbdev->mem_size = 0; |
122 | perror("mmap framebuffer"); |
123 | return -1; |
124 | } |
125 | |
126 | fbdev->mem_size = mem_size; |
127 | return 0; |
128 | } |
129 | |
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130 | void vout_fbdev_clear(struct vout_fbdev *fbdev) |
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131 | { |
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132 | memset(fbdev->mem, 0, fbdev->mem_size); |
133 | } |
134 | |
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135 | void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count) |
136 | { |
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137 | int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8; |
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138 | int i; |
139 | |
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140 | if (y + count > fbdev->top_border + fbdev->fbvar_new.yres) |
141 | count = fbdev->top_border + fbdev->fbvar_new.yres - y; |
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142 | |
143 | if (y >= 0 && count > 0) |
144 | for (i = 0; i < fbdev->buffer_count; i++) |
145 | memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count); |
146 | } |
147 | |
148 | int vout_fbdev_get_fd(struct vout_fbdev *fbdev) |
149 | { |
150 | return fbdev->fd; |
151 | } |
152 | |
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153 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf) |
154 | { |
155 | struct vout_fbdev *fbdev; |
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156 | int req_w, req_h; |
157 | int ret; |
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158 | |
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159 | fbdev = calloc(1, sizeof(*fbdev)); |
160 | if (fbdev == NULL) |
161 | return NULL; |
162 | |
163 | fbdev->fd = open(fbdev_name, O_RDWR); |
164 | if (fbdev->fd == -1) { |
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165 | fprintf(stderr, "%s: ", fbdev_name); |
166 | perror("open"); |
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167 | goto fail_open; |
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168 | } |
169 | |
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170 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
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171 | if (ret == -1) { |
172 | perror("FBIOGET_VSCREENINFO ioctl"); |
173 | goto fail; |
174 | } |
175 | |
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176 | fbdev->fbvar_new = fbdev->fbvar_old; |
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177 | |
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178 | req_w = fbdev->fbvar_new.xres; |
179 | if (*w != 0) |
180 | req_w = *w; |
181 | req_h = fbdev->fbvar_new.yres; |
182 | if (*h != 0) |
183 | req_h = *h; |
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184 | |
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185 | ret = vout_fbdev_resize(fbdev, req_w, req_h, 0, 0, 0, 0, no_dblbuf); |
186 | if (ret != 0) |
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187 | goto fail; |
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188 | |
189 | printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres, |
190 | fbdev->fbvar_new.bits_per_pixel); |
191 | *w = fbdev->fbvar_new.xres; |
192 | *h = fbdev->fbvar_new.yres; |
193 | |
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194 | memset(fbdev->mem, 0, fbdev->mem_size); |
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195 | |
196 | // some checks |
197 | ret = 0; |
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198 | ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret); |
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199 | if (ret != 0) |
200 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
201 | |
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202 | if (fbdev->buffer_count > 1) { |
203 | fbdev->buffer_write = 0; |
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204 | fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1); |
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205 | ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
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206 | if (ret != 0) { |
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207 | fbdev->buffer_count = 1; |
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208 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
209 | } |
210 | } |
211 | |
212 | printf("fbdev initialized.\n"); |
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213 | return fbdev; |
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214 | |
215 | fail: |
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216 | close(fbdev->fd); |
217 | fail_open: |
218 | free(fbdev); |
219 | return NULL; |
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220 | } |
221 | |
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222 | void vout_fbdev_finish(struct vout_fbdev *fbdev) |
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223 | { |
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224 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
225 | if (fbdev->mem != MAP_FAILED) |
226 | munmap(fbdev->mem, fbdev->mem_size); |
227 | if (fbdev->fd >= 0) |
228 | close(fbdev->fd); |
229 | fbdev->mem = NULL; |
230 | fbdev->fd = -1; |
231 | free(fbdev); |
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232 | } |
233 | |