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
27 #include <linux/fb.h>
28 #include <linux/kd.h>
29
30 #include <pixelflinger/pixelflinger.h>
31
32 #include "font_10x18.h"
33 #include "minui.h"
34
35 typedef struct {
36 GGLSurface texture;
37 unsigned cwidth;
38 unsigned cheight;
39 unsigned ascent;
40 } GRFont;
41
42 static GRFont *gr_font = 0;
43 static GGLContext *gr_context = 0;
44 static GGLSurface gr_font_texture;
45 static GGLSurface gr_framebuffer[2];
46 static GGLSurface gr_mem_surface;
47 static unsigned gr_active_fb = 0;
48
49 static int gr_fb_fd = -1;
50 static int gr_vt_fd = -1;
51
52 static struct fb_var_screeninfo vi;
53
get_framebuffer(GGLSurface * fb)54 static int get_framebuffer(GGLSurface *fb)
55 {
56 int fd;
57 struct fb_fix_screeninfo fi;
58 void *bits;
59
60 fd = open("/dev/graphics/fb0", O_RDWR);
61 if (fd < 0) {
62 perror("cannot open fb0");
63 return -1;
64 }
65
66 if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
67 perror("failed to get fb0 info");
68 close(fd);
69 return -1;
70 }
71
72 if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
73 perror("failed to get fb0 info");
74 close(fd);
75 return -1;
76 }
77
78 bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
79 if (bits == MAP_FAILED) {
80 perror("failed to mmap framebuffer");
81 close(fd);
82 return -1;
83 }
84
85 fb->version = sizeof(*fb);
86 fb->width = vi.xres;
87 fb->height = vi.yres;
88 fb->stride = vi.xres;
89 fb->data = bits;
90 fb->format = GGL_PIXEL_FORMAT_RGB_565;
91
92 fb++;
93
94 fb->version = sizeof(*fb);
95 fb->width = vi.xres;
96 fb->height = vi.yres;
97 fb->stride = vi.xres;
98 fb->data = (void*) (((unsigned) bits) + vi.yres * vi.xres * 2);
99 fb->format = GGL_PIXEL_FORMAT_RGB_565;
100
101 return fd;
102 }
103
get_memory_surface(GGLSurface * ms)104 static void get_memory_surface(GGLSurface* ms) {
105 ms->version = sizeof(*ms);
106 ms->width = vi.xres;
107 ms->height = vi.yres;
108 ms->stride = vi.xres;
109 ms->data = malloc(vi.xres * vi.yres * 2);
110 ms->format = GGL_PIXEL_FORMAT_RGB_565;
111 }
112
set_active_framebuffer(unsigned n)113 static void set_active_framebuffer(unsigned n)
114 {
115 if (n > 1) return;
116 vi.yres_virtual = vi.yres * 2;
117 vi.yoffset = n * vi.yres;
118 vi.bits_per_pixel = 16;
119 if (ioctl(gr_fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
120 perror("active fb swap failed");
121 }
122 }
123
gr_flip(void)124 void gr_flip(void)
125 {
126 GGLContext *gl = gr_context;
127
128 /* swap front and back buffers */
129 gr_active_fb = (gr_active_fb + 1) & 1;
130
131 /* copy data from the in-memory surface to the buffer we're about
132 * to make active. */
133 memcpy(gr_framebuffer[gr_active_fb].data, gr_mem_surface.data,
134 vi.xres * vi.yres * 2);
135
136 /* inform the display driver */
137 set_active_framebuffer(gr_active_fb);
138 }
139
gr_color(unsigned char r,unsigned char g,unsigned char b,unsigned char a)140 void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
141 {
142 GGLContext *gl = gr_context;
143 GGLint color[4];
144 color[0] = ((r << 8) | r) + 1;
145 color[1] = ((g << 8) | g) + 1;
146 color[2] = ((b << 8) | b) + 1;
147 color[3] = ((a << 8) | a) + 1;
148 gl->color4xv(gl, color);
149 }
150
gr_measure(const char * s)151 int gr_measure(const char *s)
152 {
153 return gr_font->cwidth * strlen(s);
154 }
155
gr_text(int x,int y,const char * s)156 int gr_text(int x, int y, const char *s)
157 {
158 GGLContext *gl = gr_context;
159 GRFont *font = gr_font;
160 unsigned off;
161
162 y -= font->ascent;
163
164 gl->bindTexture(gl, &font->texture);
165 gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
166 gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
167 gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
168 gl->enable(gl, GGL_TEXTURE_2D);
169
170 while((off = *s++)) {
171 off -= 32;
172 if (off < 96) {
173 gl->texCoord2i(gl, (off * font->cwidth) - x, 0 - y);
174 gl->recti(gl, x, y, x + font->cwidth, y + font->cheight);
175 }
176 x += font->cwidth;
177 }
178
179 return x;
180 }
181
gr_fill(int x,int y,int w,int h)182 void gr_fill(int x, int y, int w, int h)
183 {
184 GGLContext *gl = gr_context;
185 gl->disable(gl, GGL_TEXTURE_2D);
186 gl->recti(gl, x, y, w, h);
187 }
188
gr_blit(gr_surface source,int sx,int sy,int w,int h,int dx,int dy)189 void gr_blit(gr_surface source, int sx, int sy, int w, int h, int dx, int dy) {
190 if (gr_context == NULL) {
191 return;
192 }
193 GGLContext *gl = gr_context;
194
195 gl->bindTexture(gl, (GGLSurface*) source);
196 gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
197 gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
198 gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
199 gl->enable(gl, GGL_TEXTURE_2D);
200 gl->texCoord2i(gl, sx - dx, sy - dy);
201 gl->recti(gl, dx, dy, dx + w, dy + h);
202 }
203
gr_get_width(gr_surface surface)204 unsigned int gr_get_width(gr_surface surface) {
205 if (surface == NULL) {
206 return 0;
207 }
208 return ((GGLSurface*) surface)->width;
209 }
210
gr_get_height(gr_surface surface)211 unsigned int gr_get_height(gr_surface surface) {
212 if (surface == NULL) {
213 return 0;
214 }
215 return ((GGLSurface*) surface)->height;
216 }
217
gr_init_font(void)218 static void gr_init_font(void)
219 {
220 GGLSurface *ftex;
221 unsigned char *bits, *rle;
222 unsigned char *in, data;
223
224 gr_font = calloc(sizeof(*gr_font), 1);
225 ftex = &gr_font->texture;
226
227 bits = malloc(font.width * font.height);
228
229 ftex->version = sizeof(*ftex);
230 ftex->width = font.width;
231 ftex->height = font.height;
232 ftex->stride = font.width;
233 ftex->data = (void*) bits;
234 ftex->format = GGL_PIXEL_FORMAT_A_8;
235
236 in = font.rundata;
237 while((data = *in++)) {
238 memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
239 bits += (data & 0x7f);
240 }
241
242 gr_font->cwidth = font.cwidth;
243 gr_font->cheight = font.cheight;
244 gr_font->ascent = font.cheight - 2;
245 }
246
gr_init(void)247 int gr_init(void)
248 {
249 gglInit(&gr_context);
250 GGLContext *gl = gr_context;
251
252 gr_init_font();
253 gr_vt_fd = open("/dev/tty0", O_RDWR | O_SYNC);
254 if (gr_vt_fd < 0) {
255 // This is non-fatal; post-Cupcake kernels don't have tty0.
256 perror("can't open /dev/tty0");
257 } else if (ioctl(gr_vt_fd, KDSETMODE, (void*) KD_GRAPHICS)) {
258 // However, if we do open tty0, we expect the ioctl to work.
259 perror("failed KDSETMODE to KD_GRAPHICS on tty0");
260 gr_exit();
261 return -1;
262 }
263
264 gr_fb_fd = get_framebuffer(gr_framebuffer);
265 if (gr_fb_fd < 0) {
266 gr_exit();
267 return -1;
268 }
269
270 get_memory_surface(&gr_mem_surface);
271
272 fprintf(stderr, "framebuffer: fd %d (%d x %d)\n",
273 gr_fb_fd, gr_framebuffer[0].width, gr_framebuffer[0].height);
274
275 /* start with 0 as front (displayed) and 1 as back (drawing) */
276 gr_active_fb = 0;
277 set_active_framebuffer(0);
278 gl->colorBuffer(gl, &gr_mem_surface);
279
280
281 gl->activeTexture(gl, 0);
282 gl->enable(gl, GGL_BLEND);
283 gl->blendFunc(gl, GGL_SRC_ALPHA, GGL_ONE_MINUS_SRC_ALPHA);
284
285 return 0;
286 }
287
gr_exit(void)288 void gr_exit(void)
289 {
290 close(gr_fb_fd);
291 gr_fb_fd = -1;
292
293 free(gr_mem_surface.data);
294
295 ioctl(gr_vt_fd, KDSETMODE, (void*) KD_TEXT);
296 close(gr_vt_fd);
297 gr_vt_fd = -1;
298 }
299
gr_fb_width(void)300 int gr_fb_width(void)
301 {
302 return gr_framebuffer[0].width;
303 }
304
gr_fb_height(void)305 int gr_fb_height(void)
306 {
307 return gr_framebuffer[0].height;
308 }
309
gr_fb_data(void)310 gr_pixel *gr_fb_data(void)
311 {
312 return (unsigned short *) gr_mem_surface.data;
313 }
314