source: buchla-emu/emu/vid.c@ fffab34

Last change on this file since fffab34 was fffab34, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Support UND attribute.
  • Property mode set to 100644
File size: 8.9 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(vid_verbose, 0, __VA_ARGS__)
21#define ver2(...) _ver(vid_verbose, 1, __VA_ARGS__)
22#define ver3(...) _ver(vid_verbose, 2, __VA_ARGS__)
23
24int32_t vid_verbose = 0;
25
26#define SCR_W 512
27#define SCR_H 350
28#define VBL_H 50
29
30#define REG_VCR0 0
31#define REG_VCR1 1
32#define REG_RWBA 2
33#define REG_DSBA 5
34#define REG_ODTBA 7
35#define REG_ATBA 8
36#define REG_CGBA 10
37#define REG_ATBAC 11
38
39#define VCR0_UCF 0x0001
40#define VCR0_DEN 0x0008
41
42#define DSBA_BS1 0x0080
43#define DSBA_BS0 0x0100
44
45#define REG_OFF 0x200
46#define PAL_OFF 0x40000
47
48#define OD0_TDE 0x0004
49#define OD0_BLA 0x0010
50#define OD0_CB 0x0800
51
52#define AT_UND 0x0100
53#define AT_CG 0x8000
54
55#define WIN_SZ_W 0x10000
56#define MEM_SZ_W 0x20000
57
58#define N_BANKS 2
59
60#define SCALE(_x) (_x * 2)
61
62#define WIN_W SCALE(SCR_W)
63#define WIN_H SCALE(SCR_H)
64
65typedef struct {
66 int32_t x, y, w, h;
67 uint16_t *mem;
68 bool tran;
69 int32_t fon_h;
70} obj_t;
71
72static int32_t reg_off = REG_OFF;
73
74static uint16_t mem[MEM_SZ_W];
75static int32_t bank = 0;
76
77static uint32_t pal[16];
78
79static obj_t objs[16];
80static int32_t n_objs = 0;
81
82static SDL_Window *win;
83uint32_t vid_win;
84
85static SDL_Renderer *ren;
86static SDL_Texture *tex;
87static SDL_atomic_t frame;
88
89static void rend_bm(uint16_t *vid, int32_t w, int32_t h, uint32_t *pix, int32_t pitch)
90{
91 for (int32_t y = 0; y < h; ++y) {
92 for (int32_t x = 0; x < w / 4; ++x) {
93 uint16_t v4 = *vid++;
94
95 *pix++ = pal[(v4 & 0x000f) >> 0];
96 *pix++ = pal[(v4 & 0x00f0) >> 4];
97 *pix++ = pal[(v4 & 0x0f00) >> 8];
98 *pix++ = pal[(v4 & 0xf000) >> 12];
99 }
100
101 pix += pitch / 4 - w;
102 }
103}
104
105static void rend_tx(uint16_t *vid, int32_t w, int32_t h, int32_t fon_h,
106 uint32_t *pix, int32_t pitch)
107{
108 int32_t cgba = mem[REG_CGBA];
109
110 uint16_t *cg0 = mem + ((cgba & 0x00f0) << 8);
111 uint16_t *cg1 = mem + ((cgba & 0x000f) << 12);
112
113 int32_t line = fon_h - 1;
114
115 for (int32_t y = 0; y < h; ++y) {
116 uint16_t *walk = vid;
117
118 for (int32_t col2 = 0; col2 < w / 16; ++col2) {
119 uint16_t ch2 = *walk++;
120
121 for (int32_t i = 0; i < 2; ++i) {
122 int32_t ch = (uint8_t)ch2;
123 int32_t at = *walk++;
124
125 int32_t bg = at & 0x000f;
126 int32_t fg = (at & 0x00f0) >> 4;
127
128 int32_t bits;
129
130 if ((at & AT_UND) != 0 && line == 1) {
131 bits = 0xff;
132 }
133 else {
134 uint16_t *cg = (at & AT_CG) != 0 ? cg0 : cg1;
135 bits = cg[256 * line + ch];
136 }
137
138 int32_t mask = 0x01;
139
140 for (int32_t k = 0; k < 8; ++k) {
141 *pix++ = (bits & mask) != 0 ? pal[fg] : pal[bg];
142 mask <<= 1;
143 }
144
145 ch2 >>= 8;
146 }
147 }
148
149 if (--line < 0) {
150 line = fon_h - 1;
151 vid = walk;
152 }
153
154 pix += pitch / 4 - w;
155 }
156}
157
158void vid_sdl(void)
159{
160 ver3("vid_sdl()");
161
162 static int32_t last = 0;
163 int32_t now = SDL_AtomicGet(&frame);
164
165 if (last == now) {
166 ver3("no update");
167 return;
168 }
169
170 last = now;
171
172 if (SDL_RenderFillRect(ren, NULL) < 0) {
173 fail("SDL_RenderFillRect() failed: %s", SDL_GetError());
174 }
175
176 if (SDL_LockMutex(cpu_mutex) < 0) {
177 fail("SDL_LockMutex() failed: %s", SDL_GetError());
178 }
179
180 for (int32_t i = 0; i < n_objs; ++i) {
181 obj_t *obj = objs + i;
182
183 pal[0] = obj->tran ? pal[0] & 0xffffff00 : pal[0] | 0x000000ff;
184
185 SDL_Rect src = {
186 .x = 0, .y = 0, .w = obj->w, .h = obj->h
187 };
188
189 void *buf;
190 int32_t pitch;
191
192 if (SDL_LockTexture(tex, &src, &buf, &pitch) < 0) {
193 fail("SDL_LockTexture() failed: %s", SDL_GetError());
194 }
195
196 if (obj->fon_h < 0) {
197 rend_bm(obj->mem, obj->w, obj->h, buf, pitch);
198 }
199 else {
200 rend_tx(obj->mem, obj->w, obj->h, obj->fon_h, buf, pitch);
201 }
202
203 SDL_UnlockTexture(tex);
204
205 SDL_Rect dst = {
206 .x = SCALE(obj->x), .y = SCALE(obj->y),
207 .w = SCALE(obj->w), .h = SCALE(obj->h)
208 };
209
210 ver2("vid rend %d %dx%d -> (%d, %d) (%d, %d) %dx%d",
211 i,
212 obj->w, obj->h,
213 obj->x, obj->y,
214 SCALE(obj->x), SCALE(obj->y),
215 SCALE(obj->w), SCALE(obj->h));
216
217 if (SDL_RenderCopy(ren, tex, &src, &dst) < 0) {
218 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
219 }
220 }
221
222 if (SDL_UnlockMutex(cpu_mutex) < 0) {
223 fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
224 }
225
226 SDL_RenderPresent(ren);
227}
228
229void vid_init(void)
230{
231 ver("vid init");
232
233 win = SDL_CreateWindow("Display", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
234 WIN_W, WIN_H, 0);
235
236 if (win == NULL) {
237 fail("SDL_CreateWindow() failed: %s", SDL_GetError());
238 }
239
240 vid_win = SDL_GetWindowID(win);
241
242 if (vid_win == 0) {
243 fail("SDL_GetWindowID() failed: %s", SDL_GetError());
244 }
245
246 ren = SDL_CreateRenderer(win, -1, 0);
247
248 if (ren == NULL) {
249 fail("SDL_CreateRenderer() failed: %s", SDL_GetError());
250 }
251
252 if (SDL_SetRenderDrawColor(ren, 0x00, 0x00, 0x00, 0xff) < 0) {
253 fail("SDL_SetRenderDrawColor() failed: %s", SDL_GetError());
254 }
255
256 tex = SDL_CreateTexture(ren, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING,
257 SCR_W, SCR_H);
258
259 if (tex == NULL) {
260 fail("SDL_CreateTexture() failed: %s", SDL_GetError());
261 }
262
263 if (SDL_SetTextureBlendMode(tex, SDL_BLENDMODE_BLEND) < 0) {
264 fail("SDL_SetTextureBlendMode() failed: %s", SDL_GetError());
265 }
266
267 SDL_AtomicSet(&frame, 1);
268}
269
270void vid_quit(void)
271{
272 ver("vid quit");
273
274 SDL_DestroyTexture(tex);
275 SDL_DestroyRenderer(ren);
276 SDL_DestroyWindow(win);
277}
278
279bool vid_exec(void)
280{
281 ver3("vid exec");
282
283 static int32_t skip = 99999;
284 static int32_t line = 99999;
285
286 if (++skip < 10) {
287 ver3("vid skip %d", skip);
288 return false;
289 }
290
291 skip = 0;
292 int32_t vcr0 = mem[REG_VCR0];
293
294 if ((vcr0 & VCR0_DEN) == 0) {
295 ver3("vid dis");
296 return false;
297 }
298
299 if (++line < SCR_H + VBL_H) {
300 ver3("vid line %d", line);
301
302 if (line < SCR_H) {
303 ++mem[REG_ATBAC];
304 }
305
306 return line == SCR_H;
307 }
308
309 // We get here every 4,000 invocations -> 25 fps.
310
311 ver2("vid frame");
312 line = 0;
313
314 int32_t dsba = mem[REG_DSBA];
315 bank = ((dsba & DSBA_BS0) != 0 ? 1 : 0) + ((dsba & DSBA_BS1) != 0 ? 2 : 0);
316
317 int32_t rwba = mem[REG_RWBA];
318 reg_off = (rwba & 0xfff0) << 1;
319
320 int32_t atba = mem[REG_ATBA];
321 mem[REG_ATBAC] = (uint16_t)atba;
322
323 int32_t odtba = mem[REG_ODTBA] & 0xffc0;
324
325 n_objs = 0;
326
327 for (int32_t i = 0; i < 16; ++i) {
328 int32_t flips[SCR_H];
329 int32_t n_flips = 0;
330
331 uint16_t *od = mem + odtba + 4 * i;
332
333 if ((od[0] & OD0_BLA) != 0) {
334 ver3("vid obj %d blanked", i);
335 continue;
336 }
337
338 int32_t w64 = (od[1] & 0xfc00) >> 10;
339
340 if (w64 == 0) {
341 ver3("vid obj %d empty", i);
342 continue;
343 }
344
345 int32_t mask = 1 << i;
346
347 for (int32_t k = 0; k < SCR_H; ++k) {
348 if ((mem[atba + k] & mask) == 0) {
349 flips[n_flips] = k;
350 ++n_flips;
351 }
352 }
353
354 if (n_flips == 0) {
355 ver3("vid obj %d unused", i);
356 continue;
357 }
358
359 if (n_flips == 1) {
360 flips[n_flips] = SCR_H;
361 ++n_flips;
362 }
363
364 bool cb = (od[0] & OD0_CB) != 0;
365 bool tde = (od[0] & OD0_TDE) != 0;
366
367 int32_t x = (od[1] & 0x03ff) * 2;
368 int32_t off, fon_h, w;
369
370 if (cb) {
371 off = od[2];
372 int32_t vcr1 = mem[REG_VCR1];
373 fon_h = (vcr1 & 0xf000) >> 12;
374 w = w64 * 4 / 3 * 2 * 8;
375 }
376 else {
377 off = ((od[0] & 0x00c0) << 10) | od[2];
378 fon_h = -1;
379 w = w64 * 16;
380 }
381
382 obj_t *obj = objs + n_objs;
383
384 obj->x = x;
385 obj->y = flips[0];
386 obj->w = w;
387 obj->h = flips[1] - flips[0];
388 obj->mem = mem + off;
389 obj->tran = tde;
390 obj->fon_h = fon_h;
391
392 ver2("vid obj %d %c %c %d:%d %d+%d 0x%05x",
393 i, cb ? 'c' : 'b', tde ? 't' : '-', flips[0], flips[1], x, w, off);
394
395 ++n_objs;
396 }
397
398 SDL_AtomicAdd(&frame, 1);
399 return false;
400}
401
402uint32_t vid_read(uint32_t off, int32_t sz)
403{
404 ver2("vid rd %d 0x%05x:%d", bank, off, sz * 8);
405
406 int32_t off16 = (int32_t)(off / 2);
407
408 if (sz != 2 || bank >= N_BANKS || off % 2 != 0 || off16 >= WIN_SZ_W) {
409 fail("invalid vid rd %d %u:%d", bank, off, sz * 8);
410 }
411
412 if (off16 >= reg_off && off16 < reg_off + 16) {
413 return mem[off16 - reg_off];
414 }
415
416 return mem[bank * WIN_SZ_W + off16];
417}
418
419void vid_write(uint32_t off, int32_t sz, uint32_t val)
420{
421 ver2("vid wr %d 0x%05x:%d 0x%0*x", bank, off, sz * 8, sz * 2, val);
422
423 int32_t off16 = (int32_t)(off / 2);
424
425 if (sz != 2 || bank >= N_BANKS || off % 2 != 0 || (off16 >= WIN_SZ_W && off16 != PAL_OFF)) {
426 fail("invalid vid wr %d %u:%d", bank, off, sz * 8);
427 }
428
429 if (off16 == PAL_OFF) {
430 int32_t i_pal = ((int32_t)val & 0x03c0) >> 6;
431
432 uint32_t r = ((val & 0x0004) >> 1) | ((val & 0x0020) >> 5);
433 uint32_t g = ((val & 0x0002) >> 0) | ((val & 0x0010) >> 4);
434 uint32_t b = ((val & 0x0001) << 1) | ((val & 0x0008) >> 3);
435
436 r = (r ^ 3) * 85;
437 g = (g ^ 3) * 85;
438 b = (b ^ 3) * 85;
439
440 pal[i_pal] = (r << 24) | (g << 16) | (b << 8) | 0xff;
441 return;
442 }
443
444 if (off16 >= reg_off && off16 < reg_off + 16) {
445 mem[off16 - reg_off] = (uint16_t)val;
446 return;
447 }
448
449 mem[bank * WIN_SZ_W + off16] = (uint16_t)val;
450}
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