3d295a9f |
1 | /* copy-paste from PD */ |
2 | #include <stdio.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 | #define FBDEV_MAX_BUFFERS 3 |
14 | |
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; |
21 | |
22 | static void *fbdev_buffers[FBDEV_MAX_BUFFERS]; |
23 | static int fbdev_buffer_count; |
24 | static void *g_screen_ptr; |
25 | |
26 | void plat_video_flip(void) |
27 | { |
28 | int draw_buf; |
29 | |
30 | if (fbdev_buffer_count < 2) |
31 | return; |
32 | |
33 | draw_buf = fbdev_buffer_write; |
34 | fbdev_buffer_write++; |
35 | if (fbdev_buffer_write >= fbdev_buffer_count) |
36 | fbdev_buffer_write = 0; |
37 | |
38 | fbvar_new.yoffset = fbvar_old.yres * draw_buf; |
39 | g_screen_ptr = fbdev_buffers[fbdev_buffer_write]; |
40 | |
41 | ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new); |
42 | } |
43 | |
44 | void plat_video_wait_vsync(void) |
45 | { |
46 | int arg = 0; |
47 | ioctl(fbdev, FBIO_WAITFORVSYNC, &arg); |
48 | } |
49 | |
50 | int vout_fbdev_init(int *w, int *h) |
51 | { |
52 | static const char *fbdev_name = "/dev/fb0"; |
53 | int i, ret; |
54 | |
55 | fbdev = open(fbdev_name, O_RDWR); |
56 | if (fbdev == -1) { |
57 | fprintf(stderr, "%s: ", fbdev_name); |
58 | perror("open"); |
59 | return -1; |
60 | } |
61 | |
62 | ret = ioctl(fbdev, FBIOGET_VSCREENINFO, &fbvar_old); |
63 | if (ret == -1) { |
64 | perror("FBIOGET_VSCREENINFO ioctl"); |
65 | goto fail; |
66 | } |
67 | |
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); |
70 | *w = fbvar_old.xres; |
71 | *h = fbvar_old.yres; |
72 | fbdev_buffer_count = FBDEV_MAX_BUFFERS; // be optimistic |
73 | |
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); |
78 | if (ret == -1) { |
79 | perror("FBIOPUT_VSCREENINFO ioctl"); |
80 | goto fail; |
81 | } |
82 | } |
83 | |
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); |
87 | if (ret == -1) { |
88 | fbdev_buffer_count = 1; |
89 | fprintf(stderr, "Warning: failed to increase virtual resolution, " |
90 | "doublebuffering disabled\n"); |
91 | } |
92 | } |
93 | |
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); |
101 | } |
102 | if (fbdev_mem == MAP_FAILED) { |
103 | perror("mmap framebuffer"); |
104 | goto fail; |
105 | } |
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]; |
110 | |
111 | // some checks |
112 | ret = 0; |
113 | ret = ioctl(fbdev, FBIO_WAITFORVSYNC, &ret); |
114 | if (ret != 0) |
115 | fprintf(stderr, "Warning: vsync doesn't seem to be supported\n"); |
116 | |
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); |
121 | if (ret != 0) { |
122 | fbdev_buffer_count = 1; |
123 | fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n"); |
124 | } |
125 | } |
126 | |
127 | printf("fbdev initialized.\n"); |
128 | return 0; |
129 | |
130 | fail: |
131 | close(fbdev); |
132 | return -1; |
133 | } |
134 | |
135 | void vout_fbdev_finish(void) |
136 | { |
137 | ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_old); |
138 | if (fbdev_mem != MAP_FAILED) |
139 | munmap(fbdev_mem, fbdev_mem_size); |
140 | if (fbdev >= 0) |
141 | close(fbdev); |
142 | fbdev_mem = NULL; |
143 | fbdev = -1; |
144 | } |
145 | |
146 | #include "header.h" |
147 | |
148 | void *host_video_init(int *stride) |
149 | { |
150 | int ret, w, h; |
151 | |
152 | ret = vout_fbdev_init(&w, &h); |
153 | if (ret != 0) |
154 | return NULL; |
155 | |
156 | *stride = w * 2; |
157 | return g_screen_ptr; |
158 | } |
159 | |
160 | void *host_video_flip(void) |
161 | { |
162 | plat_video_flip(); |
163 | return g_screen_ptr; |
164 | } |