| 1 | /* |
| 2 | * (C) GraÅžvydas "notaz" Ignotas, 2009-2010 |
| 3 | * |
| 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. |
| 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 | |
| 25 | #define PFX "fbdev: " |
| 26 | |
| 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; |
| 37 | void *mem_saved; |
| 38 | size_t mem_saved_size; |
| 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 | |
| 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, |
| 70 | int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt) |
| 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 | |
| 80 | if (fbdev->fbvar_new.bits_per_pixel != bpp || |
| 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) |
| 90 | printf(PFX "switching to %dx%d@%d\n", w, h, bpp); |
| 91 | |
| 92 | fbdev->fbvar_new.xres = w; |
| 93 | fbdev->fbvar_new.yres = h; |
| 94 | fbdev->fbvar_new.xres_virtual = w_total; |
| 95 | fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt; |
| 96 | fbdev->fbvar_new.xoffset = left_border; |
| 97 | fbdev->fbvar_new.yoffset = top_border; |
| 98 | fbdev->fbvar_new.bits_per_pixel = bpp; |
| 99 | fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb |
| 100 | fbdev->buffer_count = buffer_cnt; |
| 101 | fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0; |
| 102 | |
| 103 | // seems to help a bit to avoid glitches |
| 104 | vout_fbdev_wait_vsync(fbdev); |
| 105 | |
| 106 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
| 107 | if (ret == -1) { |
| 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) { |
| 112 | perror(PFX "FBIOPUT_VSCREENINFO ioctl"); |
| 113 | return NULL; |
| 114 | } |
| 115 | fbdev->buffer_count = 1; |
| 116 | fbdev->buffer_write = 0; |
| 117 | fprintf(stderr, PFX "Warning: failed to increase virtual resolution, " |
| 118 | "multibuffering disabled\n"); |
| 119 | } |
| 120 | |
| 121 | } |
| 122 | |
| 123 | fbdev->fb_size = w_total * h_total * bpp / 8; |
| 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) |
| 129 | goto out; |
| 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) { |
| 136 | fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size); |
| 137 | fbdev->buffer_count = 1; |
| 138 | fbdev->buffer_write = 0; |
| 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; |
| 145 | perror(PFX "mmap framebuffer"); |
| 146 | return NULL; |
| 147 | } |
| 148 | |
| 149 | fbdev->mem_size = mem_size; |
| 150 | |
| 151 | out: |
| 152 | return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write; |
| 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 | |
| 178 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt) |
| 179 | { |
| 180 | struct vout_fbdev *fbdev; |
| 181 | int req_w, req_h; |
| 182 | void *pret; |
| 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) { |
| 191 | fprintf(stderr, PFX "%s: ", fbdev_name); |
| 192 | perror("open"); |
| 193 | goto fail_open; |
| 194 | } |
| 195 | |
| 196 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
| 197 | if (ret == -1) { |
| 198 | perror(PFX "FBIOGET_VSCREENINFO ioctl"); |
| 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 | |
| 211 | pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt); |
| 212 | if (pret == NULL) |
| 213 | goto fail; |
| 214 | |
| 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); |
| 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) |
| 226 | fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n"); |
| 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; |
| 234 | fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n"); |
| 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 | |
| 248 | static void vout_fbdev_release(struct vout_fbdev *fbdev) |
| 249 | { |
| 250 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
| 251 | if (fbdev->mem != MAP_FAILED) |
| 252 | munmap(fbdev->mem, fbdev->mem_size); |
| 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); |
| 306 | if (fbdev->fd >= 0) |
| 307 | close(fbdev->fd); |
| 308 | fbdev->fd = -1; |
| 309 | free(fbdev); |
| 310 | } |
| 311 | |