fb_test.c revision 365aff4dc3f21d14b03633f3629f69d71b39c74e 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdlib.h>
18#include <unistd.h>
19
20#include <fcntl.h>
21#include <stdio.h>
22
23#include <sys/ioctl.h>
24#include <sys/mman.h>
25#include <sys/types.h>
26#include <time.h>
27
28#include <linux/fb.h>
29#include <linux/kd.h>
30
31#include <pixelflinger/pixelflinger.h>
32
33#include "minui.h"
34
35typedef struct {
36    GGLSurface texture;
37    unsigned cwidth;
38    unsigned cheight;
39    unsigned ascent;
40} GRFont;
41
42static GGLContext *gr_context = 0;
43static GGLSurface gr_framebuffer[2];
44static unsigned gr_active_fb = 0;
45
46static int gr_fb_fd = -1;
47static int gr_vt_fd = -1;
48
49static struct fb_var_screeninfo vi;
50struct fb_fix_screeninfo fi;
51struct timespec tv, tv2;
52
53static void dumpinfo(struct fb_fix_screeninfo *fi,
54                     struct fb_var_screeninfo *vi);
55
56static int get_framebuffer(GGLSurface *fb)
57{
58    int fd;
59    void *bits;
60
61    fd = open("/dev/graphics/fb0", O_RDWR);
62    if (fd < 0) {
63        printf("cannot open /dev/graphics/fb0, retrying with /dev/fb0\n");
64        if ((fd = open("/dev/fb0", O_RDWR)) < 0) {
65            perror("cannot open /dev/fb0");
66            return -1;
67        }
68    }
69
70    if(ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
71        perror("failed to get fb0 info");
72        return -1;
73    }
74
75    if(ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
76        perror("failed to get fb0 info");
77        return -1;
78    }
79
80    dumpinfo(&fi, &vi);
81
82    bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
83    if(bits == MAP_FAILED) {
84        perror("failed to mmap framebuffer");
85        return -1;
86    }
87
88    fb->version = sizeof(*fb);
89    fb->width = vi.xres;
90    fb->height = vi.yres;
91    fb->stride = fi.line_length / (vi.bits_per_pixel >> 3);
92    fb->data = bits;
93    fb->format = GGL_PIXEL_FORMAT_RGB_565;
94
95    fb++;
96
97    fb->version = sizeof(*fb);
98    fb->width = vi.xres;
99    fb->height = vi.yres;
100    fb->stride = fi.line_length / (vi.bits_per_pixel >> 3);
101    fb->data = (void*) (((unsigned) bits) + vi.yres * vi.xres * 2);
102    fb->format = GGL_PIXEL_FORMAT_RGB_565;
103
104    return fd;
105}
106
107static void set_active_framebuffer(unsigned n)
108{
109    if(n > 1) return;
110    vi.yres_virtual = vi.yres * 2;
111    vi.yoffset = n * vi.yres;
112    if(ioctl(gr_fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
113        fprintf(stderr,"active fb swap failed!\n");
114    } else
115        printf("active buffer: %d\n", n);
116}
117
118static void dumpinfo(struct fb_fix_screeninfo *fi, struct fb_var_screeninfo *vi)
119{
120    fprintf(stderr,"vi.xres = %d\n", vi->xres);
121    fprintf(stderr,"vi.yres = %d\n", vi->yres);
122    fprintf(stderr,"vi.xresv = %d\n", vi->xres_virtual);
123    fprintf(stderr,"vi.yresv = %d\n", vi->yres_virtual);
124    fprintf(stderr,"vi.xoff = %d\n", vi->xoffset);
125    fprintf(stderr,"vi.yoff = %d\n", vi->yoffset);
126    fprintf(stderr, "vi.bits_per_pixel = %d\n", vi->bits_per_pixel);
127
128    fprintf(stderr, "fi.line_length = %d\n", fi->line_length);
129
130}
131
132int gr_init(void)
133{
134    int fd = -1;
135
136    if (!access("/dev/tty0", F_OK)) {
137        fd = open("/dev/tty0", O_RDWR | O_SYNC);
138        if(fd < 0)
139            return -1;
140
141        if(ioctl(fd, KDSETMODE, (void*) KD_GRAPHICS)) {
142            close(fd);
143            return -1;
144        }
145    }
146
147    gr_fb_fd = get_framebuffer(gr_framebuffer);
148
149    if(gr_fb_fd < 0) {
150        if (fd >= 0) {
151            ioctl(fd, KDSETMODE, (void*) KD_TEXT);
152            close(fd);
153        }
154        return -1;
155    }
156
157    gr_vt_fd = fd;
158
159        /* start with 0 as front (displayed) and 1 as back (drawing) */
160    gr_active_fb = 0;
161    set_active_framebuffer(0);
162
163    return 0;
164}
165
166void gr_exit(void)
167{
168    close(gr_fb_fd);
169    gr_fb_fd = -1;
170
171    if (gr_vt_fd >= 0) {
172        ioctl(gr_vt_fd, KDSETMODE, (void*) KD_TEXT);
173        close(gr_vt_fd);
174        gr_vt_fd = -1;
175    }
176}
177
178int gr_fb_width(void)
179{
180    return gr_framebuffer[0].width;
181}
182
183int gr_fb_height(void)
184{
185    return gr_framebuffer[0].height;
186}
187
188uint16_t red = 0xf800;
189uint16_t green = 0x07e0;
190uint16_t blue = 0x001f;
191
192void draw_grid(int w, int h, uint16_t* loc) {
193  int i, j;
194  int v;
195  int stride = fi.line_length / (vi.bits_per_pixel >> 3);
196
197  for (j = 0; j < h/2; j++) {
198    for (i = 0; i < w/2; i++)
199      loc[i + j*(stride)] = red;
200    for (; i < w; i++)
201      loc[i + j*(stride)] = green;
202  }
203  for (; j < h; j++) {
204    for (i = 0; i < w/2; i++)
205      loc[i + j*(stride)] = blue;
206    for (; i < w; i++)
207      loc[i + j*(stride)] = 0xffff;
208  }
209
210}
211
212void clear_screen(int w, int h, uint16_t* loc)
213{
214    int i,j;
215    int stride = fi.line_length / (vi.bits_per_pixel >> 3);
216
217  for (j = 0; j < h; j++)
218    for (i = 0; i < w; i++)
219      loc[i + j*(stride)] = 0x0000;
220}
221
222int main(int argc, char **argv) {
223  int w;
224  int h;
225  int id = 0;
226  gr_init();
227  w = vi.xres;
228  h = vi.yres;
229  clear_screen(w, h, (uint16_t *)gr_framebuffer[0].data);
230  clear_screen(w, h, (uint16_t *)gr_framebuffer[1].data);
231
232  if (argc > 2) {
233    w = atoi(argv[1]);
234    h = atoi(argv[2]);
235  }
236
237  if (argc > 3)
238      id = !!atoi(argv[3]);
239
240  draw_grid(w, h, (uint16_t *)gr_framebuffer[id].data);
241  set_active_framebuffer(!id);
242  set_active_framebuffer(id);
243
244  return 0;
245}
246