source: buchla-emu/emu/lcd.c@ 1b30217

Last change on this file since 1b30217 was 1b30217, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Clean up constants.
  • Property mode set to 100644
File size: 7.7 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 / 3)
27#define WIN_H (304 * 2 / 3)
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;
66static SDL_Renderer *ren;
67static SDL_atomic_t frame;
68static SDL_atomic_t ena;
69
70static TTF_Font *fon;
71static int32_t fon_w, fon_h;
72
73static int32_t txt_w, txt_h;
74static SDL_Surface *txt;
75static SDL_Texture *gfx;
76
77static int32_t com;
78static int32_t n_arg;
79static int32_t cur = BASE_TXT;
80static int32_t dir = DIR_RIGHT;
81
82void lcd_sdl(void)
83{
84 ver3("lcd_sdl()");
85
86 static int32_t last = 0;
87 int32_t now = SDL_AtomicGet(&frame);
88
89 if (last == now) {
90 ver3("no update");
91 return;
92 }
93
94 last = now;
95
96 if (SDL_FillRect(txt, NULL, TXT_BGR) < 0) {
97 fail("SDL_FillRect() failed: %s", SDL_GetError());
98 }
99
100 if (SDL_AtomicGet(&ena) == 0) {
101 SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, txt);
102
103 if (tex == NULL) {
104 fail("SDL_CreateTextureFromSurface() failed: %s", SDL_GetError());
105 }
106
107 if (SDL_RenderCopy(ren, tex, NULL, NULL) < 0) {
108 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
109 }
110
111 SDL_DestroyTexture(tex);
112 SDL_RenderPresent(ren);
113 return;
114 }
115
116 for (int32_t y = 0; y < TXT_H; ++y) {
117 char line[TXT_W + 1];
118
119 if (SDL_LockMutex(cpu_mutex) < 0) {
120 fail("SDL_LockMutex() failed: %s", SDL_GetError());
121 }
122
123 memcpy(line, mem_txt + y * TXT_W, TXT_W);
124
125 if (SDL_UnlockMutex(cpu_mutex) < 0) {
126 fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
127 }
128
129 for (int32_t x = 0; x < TXT_W; ++x) {
130 if (line[x] == 0x00) {
131 line[x] = ' ';
132 }
133 }
134
135 line[TXT_W] = 0;
136
137 SDL_Surface *lin = TTF_RenderText_Blended(fon, line, TXT_FGR);
138
139 if (lin == NULL) {
140 fail("TTF_RenderText_Blended() failed: %s", TTF_GetError());
141 }
142
143 if (SDL_BlitSurface(lin, NULL, txt, &(SDL_Rect){
144 .x = 0,
145 .y = y * fon_h,
146 .w = TXT_W * fon_w,
147 .h = fon_h
148 })) {
149 fail("SDL_BlitSurface() failed: %s", SDL_GetError());
150 }
151
152 SDL_FreeSurface(lin);
153 }
154
155 SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, txt);
156
157 if (tex == NULL) {
158 fail("SDL_CreateTextureFromSurface() failed: %s", SDL_GetError());
159 }
160
161 if (SDL_RenderCopy(ren, tex, NULL, NULL) < 0) {
162 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
163 }
164
165 SDL_DestroyTexture(tex);
166
167 void *buf;
168 int32_t pitch;
169
170 if (SDL_LockTexture(gfx, NULL, &buf, &pitch) < 0) {
171 fail("SDL_LockTexture() failed: %s", SDL_GetError());
172 }
173
174 uint32_t *pix = buf;
175
176 for (int32_t y = 0; y < GFX_H; ++y) {
177 for (int32_t x = 0; x < GFX_W; ++x) {
178 uint8_t b = mem_gfx[y * GFX_W + x];
179
180 for (int32_t p = 0; p < GFX_PIX; ++p) {
181 bool set = (b & (1 << (7 - p))) != 0;
182 *pix++ = set ? GFX_FGR : GFX_BGR;
183 }
184 }
185
186 pix += pitch / 4 - GFX_W * GFX_PIX;
187 }
188
189 SDL_UnlockTexture(gfx);
190
191 if (SDL_RenderCopy(ren, gfx, NULL, NULL) < 0) {
192 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
193 }
194
195 SDL_RenderPresent(ren);
196}
197
198void lcd_init(void)
199{
200 ver("lcd init");
201
202 win = SDL_CreateWindow("LCD", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
203 WIN_W, WIN_H, 0);
204
205 if (win == NULL) {
206 fail("SDL_CreateWindow() failed: %s", SDL_GetError());
207 }
208
209 ren = SDL_CreateRenderer(win, -1, 0);
210
211 if (ren == NULL) {
212 fail("SDL_CreateRenderer() failed: %s", SDL_GetError());
213 }
214
215 gfx = SDL_CreateTexture(ren, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING,
216 GFX_W * GFX_PIX, GFX_H);
217
218 if (gfx == NULL) {
219 fail("SDL_CreateTexture() failed: %s", SDL_GetError());
220 }
221
222 if (SDL_SetTextureBlendMode(gfx, SDL_BLENDMODE_BLEND) < 0) {
223 fail("SDL_SetTextureBlendMode() failed: %s", SDL_GetError());
224 }
225
226 SDL_RWops *ops = SDL_RWFromFile(font, "rb");
227
228 if (ops == NULL) {
229 fail("error while opening font file %s: %s", font, SDL_GetError());
230 }
231
232 fon = TTF_OpenFontRW(ops, 1, 32);
233
234 if (fon == NULL) {
235 fail("error while loading font file %s: %s", font, TTF_GetError());
236 }
237
238 fon_h = TTF_FontLineSkip(fon);
239
240 if (TTF_GlyphMetrics(fon, 'X', NULL, NULL, NULL, NULL, &fon_w) < 0) {
241 fail("error while measuring font width: %s", TTF_GetError());
242 }
243
244 txt_w = TXT_W * fon_w;
245 txt_h = TXT_H * fon_h;
246
247 txt = SDL_CreateRGBSurfaceWithFormat(0, txt_w, txt_h, 32, SDL_PIXELFORMAT_RGBA8888);
248
249 if (txt == NULL) {
250 fail("SDL_CreateRGBSurface() failed: %s", SDL_GetError());
251 }
252
253 for (int32_t i = 0; i < TXT_W * TXT_H; ++i) {
254 mem_txt[i] = ' ';
255 }
256}
257
258void lcd_quit(void)
259{
260 ver("lcd quit");
261
262 SDL_FreeSurface(txt);
263 TTF_CloseFont(fon);
264
265 SDL_DestroyTexture(gfx);
266
267 SDL_DestroyRenderer(ren);
268 SDL_DestroyWindow(win);
269}
270
271bool lcd_exec(void)
272{
273 ver3("lcd exec");
274 return false;
275}
276
277uint32_t lcd_read(uint32_t off, int32_t sz)
278{
279 ver2("lcd rd %u:%d", off, sz * 8);
280
281 if (sz != 1 || off != 1) {
282 fail("invalid lcd rd %u:%d", off, sz * 8);
283 }
284
285 switch (com) {
286 case COM_MREAD:
287 if (cur >= BASE_TXT && cur < BASE_TXT + TXT_W * TXT_H) {
288 return mem_txt[cur - BASE_TXT];
289 }
290
291 if (cur >= BASE_GFX && cur < BASE_GFX + GFX_W * GFX_H) {
292 return mem_gfx[cur - BASE_GFX];
293 }
294
295 return 0x00;
296
297 default:
298 return 0x00;
299 }
300}
301
302static void proc_arg(int32_t val)
303{
304 switch (com) {
305 case COM_MWRITE:
306 if (cur >= BASE_TXT && cur < BASE_TXT + TXT_W * TXT_H) {
307 mem_txt[cur - BASE_TXT] = (uint8_t)val;
308 }
309 else if (cur >= BASE_GFX && cur < BASE_GFX + GFX_W * GFX_H) {
310 mem_gfx[cur - BASE_GFX] = (uint8_t)val;
311 }
312
313 cur += dir;
314 SDL_AtomicAdd(&frame, 1);
315 break;
316
317 case COM_CRSWR:
318 if (n_arg == 0) {
319 cur = val;
320 }
321 else if (n_arg == 1) {
322 cur |= val << 8;
323
324 if (cur < BASE_TXT ||
325 (cur >= BASE_TXT + TXT_W * TXT_H && cur < BASE_GFX) ||
326 cur >= BASE_GFX + GFX_W * GFX_H) {
327 fail("invalid address 0x%04x", cur);
328 }
329 }
330
331 break;
332
333 default:
334 break;
335 }
336}
337
338static void proc_com(int32_t val)
339{
340 switch (val) {
341 case COM_CRSWR:
342 case COM_MREAD:
343 case COM_MWRITE:
344 com = val;
345 break;
346
347 case COM_CRSMRT:
348 dir = DIR_RIGHT;
349 com = COM_NONE;
350 break;
351
352 case COM_CRSMUP:
353 dir = DIR_UP;
354 com = COM_NONE;
355 break;
356
357 case COM_CRSMDN:
358 dir = DIR_DOWN;
359 com = COM_NONE;
360 break;
361
362 case COM_DSPOFF:
363 SDL_AtomicSet(&ena, 0);
364 com = COM_NONE;
365 break;
366
367 case COM_DSPON:
368 SDL_AtomicSet(&ena, 1);
369 com = COM_NONE;
370 break;
371
372 default:
373 com = COM_NONE;
374 break;
375 }
376}
377
378void lcd_write(uint32_t off, int32_t sz, uint32_t val)
379{
380 ver2("lcd wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
381
382 if (sz != 1 || off > 1) {
383 fail("invalid lcd wr %u:%d", off, sz * 8);
384 }
385
386 switch (off) {
387 case REG_ARG:
388 proc_arg((int32_t)val);
389 ++n_arg;
390 break;
391
392 case REG_COM:
393 proc_com((int32_t)val);
394 n_arg = 0;
395 break;
396
397 default:
398 break;
399 }
400}
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