9d532a532d02dd15392d90f873020aea894100de
[pcsx_rearmed.git] / frontend / linux / fbdev.c
1 /*
2  * (C) Gražvydas "notaz" Ignotas, 2009-2010
3  *
4  * This work is licensed under the terms of any of these licenses
5  * (at your option):
6  *  - GNU GPL, version 2 or later.
7  *  - GNU LGPL, version 2.1 or later.
8  * See the COPYING file in the top-level directory.
9  */
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <sys/types.h>
15 #include <sys/stat.h>
16 #include <fcntl.h>
17 #include <sys/ioctl.h>
18 #include <sys/mman.h>
19 #include <unistd.h>
20 #include <linux/fb.h>
21 #include <linux/matroxfb.h>
22
23 #include "fbdev.h"
24
25 struct vout_fbdev {
26         int     fd;
27         void    *mem;
28         size_t  mem_size;
29         struct  fb_var_screeninfo fbvar_old;
30         struct  fb_var_screeninfo fbvar_new;
31         int     buffer_write;
32         int     fb_size;
33         int     buffer_count;
34         int     top_border, bottom_border;
35 };
36
37 void *vout_fbdev_flip(struct vout_fbdev *fbdev)
38 {
39         int draw_buf;
40
41         if (fbdev->buffer_count < 2)
42                 return fbdev->mem;
43
44         draw_buf = fbdev->buffer_write;
45         fbdev->buffer_write++;
46         if (fbdev->buffer_write >= fbdev->buffer_count)
47                 fbdev->buffer_write = 0;
48
49         fbdev->fbvar_new.yoffset = 
50                 (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
51                 fbdev->top_border;
52
53         ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
54
55         return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
56 }
57
58 void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
59 {
60         int arg = 0;
61         ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
62 }
63
64 /* it is recommended to call vout_fbdev_clear() before this */
65 void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
66                       int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
67 {
68         int w_total = left_border + w + right_border;
69         int h_total = top_border + h + bottom_border;
70         size_t mem_size;
71         int ret;
72
73         // unblank to be sure the mode is really accepted
74         ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
75
76         if (fbdev->fbvar_new.bits_per_pixel != bpp ||
77                         fbdev->fbvar_new.xres != w ||
78                         fbdev->fbvar_new.yres != h ||
79                         fbdev->fbvar_new.xres_virtual != w_total||
80                         fbdev->fbvar_new.yres_virtual < h_total ||
81                         fbdev->fbvar_new.xoffset != left_border ||
82                         fbdev->buffer_count != buffer_cnt)
83         {
84                 if (fbdev->fbvar_new.bits_per_pixel != bpp ||
85                                 w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
86                         printf(" switching to %dx%d@%d\n", w, h, bpp);
87
88                 fbdev->fbvar_new.xres = w;
89                 fbdev->fbvar_new.yres = h;
90                 fbdev->fbvar_new.xres_virtual = w_total;
91                 fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
92                 fbdev->fbvar_new.xoffset = left_border;
93                 fbdev->fbvar_new.yoffset = top_border;
94                 fbdev->fbvar_new.bits_per_pixel = bpp;
95                 fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
96                 fbdev->buffer_count = buffer_cnt;
97                 fbdev->buffer_write = 1;
98
99                 // seems to help a bit to avoid glitches
100                 vout_fbdev_wait_vsync(fbdev);
101
102                 ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
103                 if (ret == -1) {
104                         // retry with no multibuffering
105                         fbdev->fbvar_new.yres_virtual = h_total;
106                         ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
107                         if (ret == -1) {
108                                 perror("FBIOPUT_VSCREENINFO ioctl");
109                                 return NULL;
110                         }
111                         fbdev->buffer_count = 1;
112                         fbdev->buffer_write = 0;
113                         fprintf(stderr, "Warning: failed to increase virtual resolution, "
114                                         "multibuffering disabled\n");
115                 }
116
117         }
118
119         fbdev->fb_size = w_total * h_total * bpp / 8;
120         fbdev->top_border = top_border;
121         fbdev->bottom_border = bottom_border;
122
123         mem_size = fbdev->fb_size * fbdev->buffer_count;
124         if (fbdev->mem_size >= mem_size)
125                 goto out;
126
127         if (fbdev->mem != NULL)
128                 munmap(fbdev->mem, fbdev->mem_size);
129
130         fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
131         if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
132                 fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
133                 fbdev->buffer_count = 1;
134                 fbdev->buffer_write = 0;
135                 mem_size = fbdev->fb_size;
136                 fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
137         }
138         if (fbdev->mem == MAP_FAILED) {
139                 fbdev->mem = NULL;
140                 fbdev->mem_size = 0;
141                 perror("mmap framebuffer");
142                 return NULL;
143         }
144
145         fbdev->mem_size = mem_size;
146
147 out:
148         return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
149 }
150
151 void vout_fbdev_clear(struct vout_fbdev *fbdev)
152 {
153         memset(fbdev->mem, 0, fbdev->mem_size);
154 }
155
156 void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
157 {
158         int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
159         int i;
160
161         if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
162                 count = fbdev->top_border + fbdev->fbvar_new.yres - y;
163
164         if (y >= 0 && count > 0)
165                 for (i = 0; i < fbdev->buffer_count; i++)
166                         memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
167 }
168
169 int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
170 {
171         return fbdev->fd;
172 }
173
174 struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
175 {
176         struct vout_fbdev *fbdev;
177         int req_w, req_h;
178         void *pret;
179         int ret;
180
181         fbdev = calloc(1, sizeof(*fbdev));
182         if (fbdev == NULL)
183                 return NULL;
184
185         fbdev->fd = open(fbdev_name, O_RDWR);
186         if (fbdev->fd == -1) {
187                 fprintf(stderr, "%s: ", fbdev_name);
188                 perror("open");
189                 goto fail_open;
190         }
191
192         ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
193         if (ret == -1) {
194                 perror("FBIOGET_VSCREENINFO ioctl");
195                 goto fail;
196         }
197
198         fbdev->fbvar_new = fbdev->fbvar_old;
199
200         req_w = fbdev->fbvar_new.xres;
201         if (*w != 0)
202                 req_w = *w;
203         req_h = fbdev->fbvar_new.yres;
204         if (*h != 0)
205                 req_h = *h;
206
207         pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
208         if (pret == NULL)
209                 goto fail;
210
211         printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
212                 fbdev->fbvar_new.bits_per_pixel);
213         *w = fbdev->fbvar_new.xres;
214         *h = fbdev->fbvar_new.yres;
215
216         memset(fbdev->mem, 0, fbdev->mem_size);
217
218         // some checks
219         ret = 0;
220         ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
221         if (ret != 0)
222                 fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
223
224         if (fbdev->buffer_count > 1) {
225                 fbdev->buffer_write = 0;
226                 fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
227                 ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
228                 if (ret != 0) {
229                         fbdev->buffer_count = 1;
230                         fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
231                 }
232         }
233
234         printf("fbdev initialized.\n");
235         return fbdev;
236
237 fail:
238         close(fbdev->fd);
239 fail_open:
240         free(fbdev);
241         return NULL;
242 }
243
244 void vout_fbdev_finish(struct vout_fbdev *fbdev)
245 {
246         ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
247         if (fbdev->mem != MAP_FAILED)
248                 munmap(fbdev->mem, fbdev->mem_size);
249         if (fbdev->fd >= 0)
250                 close(fbdev->fd);
251         fbdev->mem = NULL;
252         fbdev->fd = -1;
253         free(fbdev);
254 }
255