| 1 | #include <stdio.h> |
| 2 | #include <string.h> |
| 3 | #include <sys/types.h> |
| 4 | #include <sys/stat.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <sys/ioctl.h> |
| 7 | #include <sys/mman.h> |
| 8 | #include <unistd.h> |
| 9 | #include <linux/fb.h> |
| 10 | #include <linux/matroxfb.h> |
| 11 | |
| 12 | #include "../common/emu.h" |
| 13 | #include "fbdev.h" |
| 14 | |
| 15 | #define FBDEV_MAX_BUFFERS 3 |
| 16 | |
| 17 | static int fbdev = -1; |
| 18 | static void *fbdev_mem = MAP_FAILED; |
| 19 | static int fbdev_mem_size; |
| 20 | static struct fb_var_screeninfo fbvar_old; |
| 21 | static struct fb_var_screeninfo fbvar_new; |
| 22 | static int fbdev_buffer_write; |
| 23 | |
| 24 | void *fbdev_buffers[FBDEV_MAX_BUFFERS]; |
| 25 | int fbdev_buffer_count; |
| 26 | |
| 27 | void plat_video_flip(void) |
| 28 | { |
| 29 | int draw_buf; |
| 30 | |
| 31 | if (fbdev_buffer_count < 2) |
| 32 | return; |
| 33 | |
| 34 | draw_buf = fbdev_buffer_write; |
| 35 | fbdev_buffer_write++; |
| 36 | if (fbdev_buffer_write >= fbdev_buffer_count) |
| 37 | fbdev_buffer_write = 0; |
| 38 | |
| 39 | fbvar_new.yoffset = fbvar_old.yres * draw_buf; |
| 40 | g_screen_ptr = fbdev_buffers[fbdev_buffer_write]; |
| 41 | |
| 42 | ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new); |
| 43 | } |
| 44 | |
| 45 | void plat_video_wait_vsync(void) |
| 46 | { |
| 47 | int arg = 0; |
| 48 | ioctl(fbdev, FBIO_WAITFORVSYNC, &arg); |
| 49 | } |
| 50 | |
| 51 | int vout_fbdev_init(int *w, int *h) |
| 52 | { |
| 53 | static const char *fbdev_name = "/dev/fb0"; |
| 54 | int i, ret; |
| 55 | |
| 56 | fbdev = open(fbdev_name, O_RDWR); |
| 57 | if (fbdev == -1) { |
| 58 | fprintf(stderr, "%s: ", fbdev_name); |
| 59 | perror("open"); |
| 60 | return -1; |
| 61 | } |
| 62 | |
| 63 | ret = ioctl(fbdev, FBIOGET_VSCREENINFO, &fbvar_old); |
| 64 | if (ret == -1) { |
| 65 | perror("FBIOGET_VSCREENINFO ioctl"); |
| 66 | goto fail; |
| 67 | } |
| 68 | |
| 69 | fbvar_new = fbvar_old; |
| 70 | printf("%s: %ix%i@%d\n", fbdev_name, fbvar_old.xres, fbvar_old.yres, fbvar_old.bits_per_pixel); |
| 71 | *w = fbvar_old.xres; |
| 72 | *h = fbvar_old.yres; |
| 73 | fbdev_buffer_count = FBDEV_MAX_BUFFERS; // be optimistic |
| 74 | |
| 75 | if (fbvar_new.bits_per_pixel != 16) { |
| 76 | printf(" switching to 16bpp\n"); |
| 77 | fbvar_new.bits_per_pixel = 16; |
| 78 | ret = ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_new); |
| 79 | if (ret == -1) { |
| 80 | perror("FBIOPUT_VSCREENINFO ioctl"); |
| 81 | goto fail; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | if (fbvar_new.yres_virtual < fbvar_old.yres * fbdev_buffer_count) { |
| 86 | fbvar_new.yres_virtual = fbvar_old.yres * fbdev_buffer_count; |
| 87 | ret = ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_new); |
| 88 | if (ret == -1) { |
| 89 | fbdev_buffer_count = 1; |
| 90 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
| 91 | "doublebuffering disabled\n"); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | fbdev_mem_size = *w * *h * 2 * fbdev_buffer_count; |
| 96 | fbdev_mem = mmap(0, fbdev_mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev, 0); |
| 97 | if (fbdev_mem == MAP_FAILED && fbdev_buffer_count > 1) { |
| 98 | fprintf(stderr, "Warning: can't map %d bytes, doublebuffering disabled\n", fbdev_mem_size); |
| 99 | fbdev_mem_size = *w * *h * 2; |
| 100 | fbdev_buffer_count = 1; |
| 101 | fbdev_mem = mmap(0, fbdev_mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev, 0); |
| 102 | } |
| 103 | if (fbdev_mem == MAP_FAILED) { |
| 104 | perror("mmap framebuffer"); |
| 105 | goto fail; |
| 106 | } |
| 107 | memset(fbdev_mem, 0, fbdev_mem_size); |
| 108 | for (i = 0; i < fbdev_buffer_count; i++) |
| 109 | fbdev_buffers[i] = (char *)fbdev_mem + i * *w * *h * 2; |
| 110 | g_screen_ptr = fbdev_buffers[0]; |
| 111 | |
| 112 | // some checks |
| 113 | ret = 0; |
| 114 | ret = ioctl(fbdev, FBIO_WAITFORVSYNC, &ret); |
| 115 | if (ret != 0) |
| 116 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
| 117 | |
| 118 | if (fbdev_buffer_count > 1) { |
| 119 | fbdev_buffer_write = 0; |
| 120 | fbvar_new.yoffset = fbvar_old.yres * (fbdev_buffer_count - 1); |
| 121 | ret = ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new); |
| 122 | if (ret != 0) { |
| 123 | fbdev_buffer_count = 1; |
| 124 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | printf("fbdev initialized.\n"); |
| 129 | return 0; |
| 130 | |
| 131 | fail: |
| 132 | close(fbdev); |
| 133 | return -1; |
| 134 | } |
| 135 | |
| 136 | void vout_fbdev_finish(void) |
| 137 | { |
| 138 | ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_old); |
| 139 | if (fbdev_mem != MAP_FAILED) |
| 140 | munmap(fbdev_mem, fbdev_mem_size); |
| 141 | if (fbdev >= 0) |
| 142 | close(fbdev); |
| 143 | fbdev_mem = NULL; |
| 144 | fbdev = -1; |
| 145 | } |
| 146 | |
| 147 | #if 0 |
| 148 | void *g_screen_ptr; |
| 149 | int main() |
| 150 | { |
| 151 | int w, h; |
| 152 | vout_fbdev_init(&w, &h); |
| 153 | //while (1) |
| 154 | { |
| 155 | memset(g_screen_ptr, 0xff, fbdev_mem_size / 2); |
| 156 | plat_video_wait_vsync(); |
| 157 | plat_video_flip(); |
| 158 | memset(g_screen_ptr, 0x00, fbdev_mem_size / 2); |
| 159 | usleep(8000); |
| 160 | // plat_video_wait_vsync(); |
| 161 | plat_video_flip(); |
| 162 | } |
| 163 | } |
| 164 | #endif |