1 /* copy-paste from PD */
11 #include <linux/matroxfb.h>
13 #define FBDEV_MAX_BUFFERS 3
15 static int fbdev = -1;
16 static void *fbdev_mem = MAP_FAILED;
17 static int fbdev_mem_size;
18 static struct fb_var_screeninfo fbvar_old;
19 static struct fb_var_screeninfo fbvar_new;
20 static int fbdev_buffer_write;
22 static void *fbdev_buffers[FBDEV_MAX_BUFFERS];
23 static int fbdev_buffer_count;
24 static void *g_screen_ptr;
26 void plat_video_flip(void)
30 if (fbdev_buffer_count < 2)
33 draw_buf = fbdev_buffer_write;
35 if (fbdev_buffer_write >= fbdev_buffer_count)
36 fbdev_buffer_write = 0;
38 fbvar_new.yoffset = fbvar_old.yres * draw_buf;
39 g_screen_ptr = fbdev_buffers[fbdev_buffer_write];
41 ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new);
44 void plat_video_wait_vsync(void)
47 ioctl(fbdev, FBIO_WAITFORVSYNC, &arg);
50 int vout_fbdev_init(int *w, int *h)
52 static const char *fbdev_name = "/dev/fb0";
55 fbdev = open(fbdev_name, O_RDWR);
57 fprintf(stderr, "%s: ", fbdev_name);
62 ret = ioctl(fbdev, FBIOGET_VSCREENINFO, &fbvar_old);
64 perror("FBIOGET_VSCREENINFO ioctl");
68 fbvar_new = fbvar_old;
69 printf("%s: %ix%i@%d\n", fbdev_name, fbvar_old.xres, fbvar_old.yres, fbvar_old.bits_per_pixel);
72 fbdev_buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
74 if (fbvar_new.bits_per_pixel != 16) {
75 printf(" switching to 16bpp\n");
76 fbvar_new.bits_per_pixel = 16;
77 ret = ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_new);
79 perror("FBIOPUT_VSCREENINFO ioctl");
84 if (fbvar_new.yres_virtual < fbvar_old.yres * fbdev_buffer_count) {
85 fbvar_new.yres_virtual = fbvar_old.yres * fbdev_buffer_count;
86 ret = ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_new);
88 fbdev_buffer_count = 1;
89 fprintf(stderr, "Warning: failed to increase virtual resolution, "
90 "doublebuffering disabled\n");
94 fbdev_mem_size = *w * *h * 2 * fbdev_buffer_count;
95 fbdev_mem = mmap(0, fbdev_mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev, 0);
96 if (fbdev_mem == MAP_FAILED && fbdev_buffer_count > 1) {
97 fbdev_mem_size = *w * *h * 2;
98 fbdev_buffer_count = 1;
99 fprintf(stderr, "Warning: can't map %d bytes, doublebuffering disabled\n", fbdev_mem_size);
100 fbdev_mem = mmap(0, fbdev_mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev, 0);
102 if (fbdev_mem == MAP_FAILED) {
103 perror("mmap framebuffer");
106 memset(fbdev_mem, 0, fbdev_mem_size);
107 for (i = 0; i < fbdev_buffer_count; i++)
108 fbdev_buffers[i] = (char *)fbdev_mem + i * *w * *h * 2;
109 g_screen_ptr = fbdev_buffers[0];
113 ret = ioctl(fbdev, FBIO_WAITFORVSYNC, &ret);
115 fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
117 if (fbdev_buffer_count > 1) {
118 fbdev_buffer_write = 0;
119 fbvar_new.yoffset = fbvar_old.yres * (fbdev_buffer_count - 1);
120 ret = ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new);
122 fbdev_buffer_count = 1;
123 fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
127 printf("fbdev initialized.\n");
135 void vout_fbdev_finish(void)
137 ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_old);
138 if (fbdev_mem != MAP_FAILED)
139 munmap(fbdev_mem, fbdev_mem_size);
148 void *host_video_init(int *stride)
152 ret = vout_fbdev_init(&w, &h);
160 void *host_video_flip(void)