| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 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 | |
| 13 | #include "fbdev.h" |
| 14 | |
| 15 | #define FBDEV_MAX_BUFFERS 3 |
| 16 | |
| 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; |
| 24 | void *buffers[FBDEV_MAX_BUFFERS]; |
| 25 | int buffer_count; |
| 26 | }; |
| 27 | |
| 28 | void *vout_fbdev_flip(struct vout_fbdev *fbdev) |
| 29 | { |
| 30 | int draw_buf; |
| 31 | |
| 32 | if (fbdev->buffer_count < 2) |
| 33 | return fbdev->mem; |
| 34 | |
| 35 | draw_buf = fbdev->buffer_write; |
| 36 | fbdev->buffer_write++; |
| 37 | if (fbdev->buffer_write >= fbdev->buffer_count) |
| 38 | fbdev->buffer_write = 0; |
| 39 | |
| 40 | fbdev->fbvar_new.yoffset = fbdev->fbvar_old.yres * draw_buf; |
| 41 | |
| 42 | ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
| 43 | |
| 44 | return fbdev->buffers[fbdev->buffer_write]; |
| 45 | } |
| 46 | |
| 47 | void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev) |
| 48 | { |
| 49 | int arg = 0; |
| 50 | ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg); |
| 51 | } |
| 52 | |
| 53 | void vout_fbdev_clear(struct vout_fbdev *fbdev) |
| 54 | { |
| 55 | memset(fbdev->mem, 0, fbdev->mem_size); |
| 56 | } |
| 57 | |
| 58 | struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int no_dblbuf) |
| 59 | { |
| 60 | struct vout_fbdev *fbdev; |
| 61 | int i, ret; |
| 62 | |
| 63 | fbdev = calloc(1, sizeof(*fbdev)); |
| 64 | if (fbdev == NULL) |
| 65 | return NULL; |
| 66 | |
| 67 | fbdev->fd = open(fbdev_name, O_RDWR); |
| 68 | if (fbdev->fd == -1) { |
| 69 | fprintf(stderr, "%s: ", fbdev_name); |
| 70 | perror("open"); |
| 71 | goto fail_open; |
| 72 | } |
| 73 | |
| 74 | ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old); |
| 75 | if (ret == -1) { |
| 76 | perror("FBIOGET_VSCREENINFO ioctl"); |
| 77 | goto fail; |
| 78 | } |
| 79 | |
| 80 | fbdev->fbvar_new = fbdev->fbvar_old; |
| 81 | printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_old.xres, fbdev->fbvar_old.yres, |
| 82 | fbdev->fbvar_old.bits_per_pixel); |
| 83 | *w = fbdev->fbvar_old.xres; |
| 84 | *h = fbdev->fbvar_old.yres; |
| 85 | fbdev->buffer_count = FBDEV_MAX_BUFFERS; // be optimistic |
| 86 | if (no_dblbuf) |
| 87 | fbdev->buffer_count = 1; |
| 88 | |
| 89 | if (fbdev->fbvar_new.bits_per_pixel != 16) { |
| 90 | printf(" switching to 16bpp\n"); |
| 91 | fbdev->fbvar_new.bits_per_pixel = 16; |
| 92 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
| 93 | if (ret == -1) { |
| 94 | perror("FBIOPUT_VSCREENINFO ioctl"); |
| 95 | goto fail; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | if (fbdev->fbvar_new.yres_virtual < fbdev->fbvar_old.yres * fbdev->buffer_count) { |
| 100 | fbdev->fbvar_new.yres_virtual = fbdev->fbvar_old.yres * fbdev->buffer_count; |
| 101 | ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new); |
| 102 | if (ret == -1) { |
| 103 | fbdev->buffer_count = 1; |
| 104 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
| 105 | "doublebuffering disabled\n"); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | fbdev->mem_size = *w * *h * 2 * fbdev->buffer_count; |
| 110 | fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
| 111 | if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) { |
| 112 | fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", fbdev->mem_size); |
| 113 | fbdev->mem_size = *w * *h * 2; |
| 114 | fbdev->buffer_count = 1; |
| 115 | fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0); |
| 116 | } |
| 117 | if (fbdev->mem == MAP_FAILED) { |
| 118 | perror("mmap framebuffer"); |
| 119 | goto fail; |
| 120 | } |
| 121 | memset(fbdev->mem, 0, fbdev->mem_size); |
| 122 | for (i = 0; i < fbdev->buffer_count; i++) |
| 123 | fbdev->buffers[i] = (char *)fbdev->mem + i * *w * *h * 2; |
| 124 | |
| 125 | // some checks |
| 126 | ret = 0; |
| 127 | ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret); |
| 128 | if (ret != 0) |
| 129 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
| 130 | |
| 131 | if (fbdev->buffer_count > 1) { |
| 132 | fbdev->buffer_write = 0; |
| 133 | fbdev->fbvar_new.yoffset = fbdev->fbvar_old.yres * (fbdev->buffer_count - 1); |
| 134 | ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new); |
| 135 | if (ret != 0) { |
| 136 | fbdev->buffer_count = 1; |
| 137 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | printf("fbdev initialized.\n"); |
| 142 | return fbdev; |
| 143 | |
| 144 | fail: |
| 145 | close(fbdev->fd); |
| 146 | fail_open: |
| 147 | free(fbdev); |
| 148 | return NULL; |
| 149 | } |
| 150 | |
| 151 | void vout_fbdev_finish(struct vout_fbdev *fbdev) |
| 152 | { |
| 153 | ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old); |
| 154 | if (fbdev->mem != MAP_FAILED) |
| 155 | munmap(fbdev->mem, fbdev->mem_size); |
| 156 | if (fbdev->fd >= 0) |
| 157 | close(fbdev->fd); |
| 158 | fbdev->mem = NULL; |
| 159 | fbdev->fd = -1; |
| 160 | free(fbdev); |
| 161 | } |
| 162 | |
| 163 | #if 0 |
| 164 | void *g_screen_ptr; |
| 165 | int main() |
| 166 | { |
| 167 | int w, h; |
| 168 | vout_fbdev_init(&w, &h); |
| 169 | //while (1) |
| 170 | { |
| 171 | memset(g_screen_ptr, 0xff, fbdev_mem_size / 2); |
| 172 | plat_video_wait_vsync(); |
| 173 | plat_video_flip(); |
| 174 | memset(g_screen_ptr, 0x00, fbdev_mem_size / 2); |
| 175 | usleep(8000); |
| 176 | // plat_video_wait_vsync(); |
| 177 | plat_video_flip(); |
| 178 | } |
| 179 | } |
| 180 | #endif |