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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 | int vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp, |
65 | int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt) |
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66 | { |
67 | int w_total = left_border + w + right_border; |
68 | int h_total = top_border + h + bottom_border; |
69 | size_t mem_size; |
70 | int ret; |
71 | |
72 | // unblank to be sure the mode is really accepted |
73 | ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK); |
74 | |
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75 | if (fbdev->fbvar_new.bits_per_pixel != bpp || |
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76 | w != fbdev->fbvar_new.xres || |
77 | h != fbdev->fbvar_new.yres || |
78 | w_total != fbdev->fbvar_new.xres_virtual || |
79 | h_total > fbdev->fbvar_new.yres_virtual || |
80 | left_border != fbdev->fbvar_new.xoffset) { |
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; |
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86 | fbdev->fbvar_new.bits_per_pixel = bpp; |
87 | printf(" switching to %dx%d@%d\n", w, h, bpp); |
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88 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
89 | if (ret == -1) { |
90 | perror("FBIOPUT_VSCREENINFO ioctl"); |
91 | return -1; |
92 | } |
93 | } |
94 | |
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95 | fbdev->buffer_count = buffer_cnt; |
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96 | |
97 | if (fbdev->fbvar_new.yres_virtual < h_total * fbdev->buffer_count) { |
98 | fbdev->fbvar_new.yres_virtual = h_total * fbdev->buffer_count; |
99 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
100 | if (ret == -1) { |
101 | fbdev->buffer_count = 1; |
102 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
103 | "doublebuffering disabled\n"); |
104 | } |
105 | } |
106 | |
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107 | fbdev->fb_size = w_total * h_total * bpp / 8; |
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108 | fbdev->top_border = top_border; |
109 | fbdev->bottom_border = bottom_border; |
110 | |
111 | mem_size = fbdev->fb_size * fbdev->buffer_count; |
112 | if (fbdev->mem_size >= mem_size) |
113 | return 0; |
114 | |
115 | if (fbdev->mem != NULL) |
116 | munmap(fbdev->mem, fbdev->mem_size); |
117 | |
118 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
119 | if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) { |
120 | fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size); |
121 | fbdev->buffer_count = 1; |
122 | mem_size = fbdev->fb_size; |
123 | fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
124 | } |
125 | if (fbdev->mem == MAP_FAILED) { |
126 | fbdev->mem = NULL; |
127 | fbdev->mem_size = 0; |
128 | perror("mmap framebuffer"); |
129 | return -1; |
130 | } |
131 | |
132 | fbdev->mem_size = mem_size; |
133 | return 0; |
134 | } |
135 | |
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136 | void vout_fbdev_clear(struct vout_fbdev *fbdev) |
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137 | { |
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138 | memset(fbdev->mem, 0, fbdev->mem_size); |
139 | } |
140 | |
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141 | void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count) |
142 | { |
a505b5f1 |
143 | int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8; |
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144 | int i; |
145 | |
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146 | if (y + count > fbdev->top_border + fbdev->fbvar_new.yres) |
147 | count = fbdev->top_border + fbdev->fbvar_new.yres - y; |
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148 | |
149 | if (y >= 0 && count > 0) |
150 | for (i = 0; i < fbdev->buffer_count; i++) |
151 | memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count); |
152 | } |
153 | |
154 | int vout_fbdev_get_fd(struct vout_fbdev *fbdev) |
155 | { |
156 | return fbdev->fd; |
157 | } |
158 | |
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159 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt) |
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160 | { |
161 | struct vout_fbdev *fbdev; |
207e58ef |
162 | int req_w, req_h; |
163 | int ret; |
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164 | |
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165 | fbdev = calloc(1, sizeof(*fbdev)); |
166 | if (fbdev == NULL) |
167 | return NULL; |
168 | |
169 | fbdev->fd = open(fbdev_name, O_RDWR); |
170 | if (fbdev->fd == -1) { |
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171 | fprintf(stderr, "%s: ", fbdev_name); |
172 | perror("open"); |
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173 | goto fail_open; |
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174 | } |
175 | |
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176 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
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177 | if (ret == -1) { |
178 | perror("FBIOGET_VSCREENINFO ioctl"); |
179 | goto fail; |
180 | } |
181 | |
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182 | fbdev->fbvar_new = fbdev->fbvar_old; |
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183 | |
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184 | req_w = fbdev->fbvar_new.xres; |
185 | if (*w != 0) |
186 | req_w = *w; |
187 | req_h = fbdev->fbvar_new.yres; |
188 | if (*h != 0) |
189 | req_h = *h; |
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190 | |
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191 | ret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt); |
207e58ef |
192 | if (ret != 0) |
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193 | goto fail; |
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194 | |
195 | printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres, |
196 | fbdev->fbvar_new.bits_per_pixel); |
197 | *w = fbdev->fbvar_new.xres; |
198 | *h = fbdev->fbvar_new.yres; |
199 | |
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200 | memset(fbdev->mem, 0, fbdev->mem_size); |
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201 | |
202 | // some checks |
203 | ret = 0; |
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204 | ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret); |
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205 | if (ret != 0) |
206 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
207 | |
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208 | if (fbdev->buffer_count > 1) { |
209 | fbdev->buffer_write = 0; |
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210 | fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1); |
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211 | ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
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212 | if (ret != 0) { |
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213 | fbdev->buffer_count = 1; |
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214 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
215 | } |
216 | } |
217 | |
218 | printf("fbdev initialized.\n"); |
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219 | return fbdev; |
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220 | |
221 | fail: |
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222 | close(fbdev->fd); |
223 | fail_open: |
224 | free(fbdev); |
225 | return NULL; |
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226 | } |
227 | |
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228 | void vout_fbdev_finish(struct vout_fbdev *fbdev) |
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229 | { |
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230 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
231 | if (fbdev->mem != MAP_FAILED) |
232 | munmap(fbdev->mem, fbdev->mem_size); |
233 | if (fbdev->fd >= 0) |
234 | close(fbdev->fd); |
235 | fbdev->mem = NULL; |
236 | fbdev->fd = -1; |
237 | free(fbdev); |
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238 | } |
239 | |