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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]; |
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41 | |
42 | ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new); |
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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 | fbdev_mem_size = *w * *h * 2; |
99 | fbdev_buffer_count = 1; |
100 | fprintf(stderr, "Warning: can't map %d bytes, doublebuffering disabled\n", fbdev_mem_size); |
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 |