source: buchla-emu/emu/lcd.c

0.1
Last change on this file was 5e2fc8b, checked in by alexheinrich <alex.heinrich@…>, 6 years ago

Fix ticket #16.
  • Property mode set to 100644
File size: 8.0 KB
Line 
1/*
2 * Copyright (C) 2017 The Contributors
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or (at
7 * your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * A copy of the GNU General Public License can be found in the file
15 * "gpl.txt" in the top directory of this repository.
16 */
17
18#include <all.h>
19
20#define ver(...) _ver(lcd_verbose, 0, __VA_ARGS__)
21#define ver2(...) _ver(lcd_verbose, 1, __VA_ARGS__)
22#define ver3(...) _ver(lcd_verbose, 2, __VA_ARGS__)
23
24int32_t lcd_verbose = 0;
25
26#define WIN_W (1615 / 2)
27#define WIN_H (304 / 2)
28
29#define GFX_BGR 0x00000000
30#define GFX_FGR 0xFFFFFFFF
31
32#define TXT_BGR 0x000000FF
33#define TXT_FGR ((SDL_Color){ .r = 255, .b = 255, .g = 255, .a = 255 })
34
35#define REG_ARG 0
36#define REG_COM 1
37
38#define COM_NONE 0x00
39#define COM_MWRITE 0x42
40#define COM_MREAD 0x43
41#define COM_CRSWR 0x46
42#define COM_CRSMRT 0x4C
43#define COM_CRSMUP 0x4E
44#define COM_CRSMDN 0x4F
45#define COM_DSPOFF 0x58
46#define COM_DSPON 0x59
47
48#define TXT_W 85
49#define TXT_H 8
50
51#define GFX_W 85
52#define GFX_H 64
53#define GFX_PIX 6
54
55#define BASE_TXT 0x0000
56#define BASE_GFX 0x2000
57
58#define DIR_UP -85
59#define DIR_DOWN 85
60#define DIR_RIGHT 1
61
62static uint8_t mem_txt[TXT_H * TXT_W];
63static uint8_t mem_gfx[GFX_H * GFX_W];
64
65static SDL_Window *win;
66uint32_t lcd_win;
67
68static SDL_Renderer *ren;
69static SDL_atomic_t frame;
70static SDL_atomic_t ena;
71
72static TTF_Font *fon;
73static int32_t fon_w, fon_h;
74
75static int32_t txt_w, txt_h;
76static SDL_Surface *txt;
77static SDL_Texture *gfx;
78
79static int32_t com;
80static int32_t n_arg;
81static int32_t cur = BASE_TXT;
82static int32_t dir = DIR_RIGHT;
83
84void lcd_sdl(void)
85{
86 ver3("lcd_sdl()");
87
88 static int32_t last = 0;
89 int32_t now = SDL_AtomicGet(&frame);
90
91 if (last == now) {
92 ver3("no update");
93 return;
94 }
95
96 last = now;
97
98 if (SDL_FillRect(txt, NULL, TXT_BGR) < 0) {
99 fail("SDL_FillRect() failed: %s", SDL_GetError());
100 }
101
102 if (SDL_AtomicGet(&ena) == 0) {
103 SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, txt);
104
105 if (tex == NULL) {
106 fail("SDL_CreateTextureFromSurface() failed: %s", SDL_GetError());
107 }
108
109 if (SDL_RenderCopy(ren, tex, NULL, NULL) < 0) {
110 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
111 }
112
113 SDL_DestroyTexture(tex);
114 SDL_RenderPresent(ren);
115 return;
116 }
117
118 for (int32_t y = 0; y < TXT_H; ++y) {
119 char line[TXT_W + 1];
120 line[TXT_W] = 0;
121
122 if (SDL_LockMutex(cpu_mutex) < 0) {
123 fail("SDL_LockMutex() failed: %s", SDL_GetError());
124 }
125
126 memcpy(line, mem_txt + y * TXT_W, TXT_W);
127
128 if (SDL_UnlockMutex(cpu_mutex) < 0) {
129 fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
130 }
131
132 for (int32_t x = 0; x < TXT_W; ++x) {
133 if (line[x] == 0x00) {
134 line[x] = ' ';
135 }
136 else if (line[x] == 0x7e) {
137 line[x] = (char) 0xbb;
138 }
139 else if (line[x] == 0x7f) {
140 line[x] = (char) 0xab;
141 }
142 }
143
144 SDL_Surface *lin = TTF_RenderText_Blended(fon, line, TXT_FGR);
145
146 if (lin == NULL) {
147 fail("TTF_RenderText_Blended() failed: %s", TTF_GetError());
148 }
149
150 if (SDL_BlitSurface(lin, NULL, txt, &(SDL_Rect){
151 .x = 0,
152 .y = y * fon_h,
153 .w = TXT_W * fon_w,
154 .h = fon_h
155 })) {
156 fail("SDL_BlitSurface() failed: %s", SDL_GetError());
157 }
158
159 SDL_FreeSurface(lin);
160 }
161
162 SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, txt);
163
164 if (tex == NULL) {
165 fail("SDL_CreateTextureFromSurface() failed: %s", SDL_GetError());
166 }
167
168 if (SDL_RenderCopy(ren, tex, NULL, NULL) < 0) {
169 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
170 }
171
172 SDL_DestroyTexture(tex);
173
174 void *buf;
175 int32_t pitch;
176
177 if (SDL_LockTexture(gfx, NULL, &buf, &pitch) < 0) {
178 fail("SDL_LockTexture() failed: %s", SDL_GetError());
179 }
180
181 uint32_t *pix = buf;
182
183 for (int32_t y = 0; y < GFX_H; ++y) {
184 for (int32_t x = 0; x < GFX_W; ++x) {
185 uint8_t b = mem_gfx[y * GFX_W + x];
186
187 for (int32_t p = 0; p < GFX_PIX; ++p) {
188 bool set = (b & (1 << (7 - p))) != 0;
189 *pix++ = set ? GFX_FGR : GFX_BGR;
190 }
191 }
192
193 pix += pitch / 4 - GFX_W * GFX_PIX;
194 }
195
196 SDL_UnlockTexture(gfx);
197
198 if (SDL_RenderCopy(ren, gfx, NULL, NULL) < 0) {
199 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
200 }
201
202 SDL_RenderPresent(ren);
203}
204
205void lcd_init(void)
206{
207 ver("lcd init");
208
209 win = SDL_CreateWindow("LCD", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
210 WIN_W, WIN_H, 0);
211
212 if (win == NULL) {
213 fail("SDL_CreateWindow() failed: %s", SDL_GetError());
214 }
215
216 lcd_win = SDL_GetWindowID(win);
217
218 if (lcd_win == 0) {
219 fail("SDL_GetWindowID() failed: %s", SDL_GetError());
220 }
221
222 ren = SDL_CreateRenderer(win, -1, 0);
223
224 if (ren == NULL) {
225 fail("SDL_CreateRenderer() failed: %s", SDL_GetError());
226 }
227
228 gfx = SDL_CreateTexture(ren, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING,
229 GFX_W * GFX_PIX, GFX_H);
230
231 if (gfx == NULL) {
232 fail("SDL_CreateTexture() failed: %s", SDL_GetError());
233 }
234
235 if (SDL_SetTextureBlendMode(gfx, SDL_BLENDMODE_BLEND) < 0) {
236 fail("SDL_SetTextureBlendMode() failed: %s", SDL_GetError());
237 }
238
239 SDL_RWops *ops = SDL_RWFromFile(font, "rb");
240
241 if (ops == NULL) {
242 fail("error while opening font file %s: %s", font, SDL_GetError());
243 }
244
245 fon = TTF_OpenFontRW(ops, 1, 32);
246
247 if (fon == NULL) {
248 fail("error while loading font file %s: %s", font, TTF_GetError());
249 }
250
251 fon_h = TTF_FontLineSkip(fon);
252
253 if (TTF_GlyphMetrics(fon, 'X', NULL, NULL, NULL, NULL, &fon_w) < 0) {
254 fail("error while measuring font width: %s", TTF_GetError());
255 }
256
257 txt_w = TXT_W * fon_w;
258 txt_h = TXT_H * fon_h;
259
260 txt = SDL_CreateRGBSurfaceWithFormat(0, txt_w, txt_h, 32, SDL_PIXELFORMAT_RGBA8888);
261
262 if (txt == NULL) {
263 fail("SDL_CreateRGBSurface() failed: %s", SDL_GetError());
264 }
265
266 for (int32_t i = 0; i < TXT_W * TXT_H; ++i) {
267 mem_txt[i] = ' ';
268 }
269}
270
271void lcd_quit(void)
272{
273 ver("lcd quit");
274
275 SDL_FreeSurface(txt);
276 TTF_CloseFont(fon);
277
278 SDL_DestroyTexture(gfx);
279
280 SDL_DestroyRenderer(ren);
281 SDL_DestroyWindow(win);
282}
283
284bool lcd_exec(void)
285{
286 ver3("lcd exec");
287 return false;
288}
289
290uint32_t lcd_read(uint32_t off, int32_t sz)
291{
292 ver2("lcd rd %u:%d", off, sz * 8);
293
294 if (sz != 1 || off != 1) {
295 fail("invalid lcd rd %u:%d", off, sz * 8);
296 }
297
298 switch (com) {
299 case COM_MREAD:
300 if (cur >= BASE_TXT && cur < BASE_TXT + TXT_W * TXT_H) {
301 return mem_txt[cur - BASE_TXT];
302 }
303
304 if (cur >= BASE_GFX && cur < BASE_GFX + GFX_W * GFX_H) {
305 return mem_gfx[cur - BASE_GFX];
306 }
307
308 return 0x00;
309
310 default:
311 return 0x00;
312 }
313}
314
315static void proc_arg(int32_t val)
316{
317 switch (com) {
318 case COM_MWRITE:
319 if (cur >= BASE_TXT && cur < BASE_TXT + TXT_W * TXT_H) {
320 mem_txt[cur - BASE_TXT] = (uint8_t)val;
321 }
322 else if (cur >= BASE_GFX && cur < BASE_GFX + GFX_W * GFX_H) {
323 mem_gfx[cur - BASE_GFX] = (uint8_t)val;
324 }
325
326 cur += dir;
327 SDL_AtomicAdd(&frame, 1);
328 break;
329
330 case COM_CRSWR:
331 if (n_arg == 0) {
332 cur = val;
333 }
334 else if (n_arg == 1) {
335 cur |= val << 8;
336
337 if (cur < BASE_TXT ||
338 (cur >= BASE_TXT + TXT_W * TXT_H && cur < BASE_GFX) ||
339 cur >= BASE_GFX + GFX_W * GFX_H) {
340 fail("invalid address 0x%04x", cur);
341 }
342 }
343
344 break;
345
346 default:
347 break;
348 }
349}
350
351static void proc_com(int32_t val)
352{
353 switch (val) {
354 case COM_CRSWR:
355 case COM_MREAD:
356 case COM_MWRITE:
357 com = val;
358 break;
359
360 case COM_CRSMRT:
361 dir = DIR_RIGHT;
362 com = COM_NONE;
363 break;
364
365 case COM_CRSMUP:
366 dir = DIR_UP;
367 com = COM_NONE;
368 break;
369
370 case COM_CRSMDN:
371 dir = DIR_DOWN;
372 com = COM_NONE;
373 break;
374
375 case COM_DSPOFF:
376 SDL_AtomicSet(&ena, 0);
377 com = COM_NONE;
378 break;
379
380 case COM_DSPON:
381 SDL_AtomicSet(&ena, 1);
382 com = COM_NONE;
383 break;
384
385 default:
386 com = COM_NONE;
387 break;
388 }
389}
390
391void lcd_write(uint32_t off, int32_t sz, uint32_t val)
392{
393 ver2("lcd wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
394
395 if (sz != 1 || off > 1) {
396 fail("invalid lcd wr %u:%d", off, sz * 8);
397 }
398
399 switch (off) {
400 case REG_ARG:
401 proc_arg((int32_t)val);
402 ++n_arg;
403 break;
404
405 case REG_COM:
406 proc_com((int32_t)val);
407 n_arg = 0;
408 break;
409
410 default:
411 break;
412 }
413}
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