src/gba/renderers/video-software.c (view raw)
1/* Copyright (c) 2013-2015 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include "software-private.h"
7
8#include "gba/gba.h"
9#include "gba/io.h"
10
11#include "util/arm-algo.h"
12
13static void GBAVideoSoftwareRendererInit(struct GBAVideoRenderer* renderer);
14static void GBAVideoSoftwareRendererDeinit(struct GBAVideoRenderer* renderer);
15static void GBAVideoSoftwareRendererReset(struct GBAVideoRenderer* renderer);
16static void GBAVideoSoftwareRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address);
17static void GBAVideoSoftwareRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam);
18static void GBAVideoSoftwareRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
19static uint16_t GBAVideoSoftwareRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
20static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* renderer, int y);
21static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer);
22static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels);
23static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer, unsigned stride, void* pixels);
24
25static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRenderer* renderer);
26static void GBAVideoSoftwareRendererWriteBGCNT(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* bg, uint16_t value);
27static void GBAVideoSoftwareRendererWriteBGPA(struct GBAVideoSoftwareBackground* bg, uint16_t value);
28static void GBAVideoSoftwareRendererWriteBGPB(struct GBAVideoSoftwareBackground* bg, uint16_t value);
29static void GBAVideoSoftwareRendererWriteBGPC(struct GBAVideoSoftwareBackground* bg, uint16_t value);
30static void GBAVideoSoftwareRendererWriteBGPD(struct GBAVideoSoftwareBackground* bg, uint16_t value);
31static void GBAVideoSoftwareRendererWriteBGX_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value);
32static void GBAVideoSoftwareRendererWriteBGX_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value);
33static void GBAVideoSoftwareRendererWriteBGY_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value);
34static void GBAVideoSoftwareRendererWriteBGY_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value);
35static void GBAVideoSoftwareRendererWriteBLDCNT(struct GBAVideoSoftwareRenderer* renderer, uint16_t value);
36
37static void _cleanOAM(struct GBAVideoSoftwareRenderer* renderer);
38static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y);
39
40static void _updatePalettes(struct GBAVideoSoftwareRenderer* renderer);
41
42static void _breakWindow(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win, int y);
43static void _breakWindowInner(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win);
44
45void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer) {
46 renderer->d.init = GBAVideoSoftwareRendererInit;
47 renderer->d.reset = GBAVideoSoftwareRendererReset;
48 renderer->d.deinit = GBAVideoSoftwareRendererDeinit;
49 renderer->d.writeVideoRegister = GBAVideoSoftwareRendererWriteVideoRegister;
50 renderer->d.writeVRAM = GBAVideoSoftwareRendererWriteVRAM;
51 renderer->d.writeOAM = GBAVideoSoftwareRendererWriteOAM;
52 renderer->d.writePalette = GBAVideoSoftwareRendererWritePalette;
53 renderer->d.drawScanline = GBAVideoSoftwareRendererDrawScanline;
54 renderer->d.finishFrame = GBAVideoSoftwareRendererFinishFrame;
55 renderer->d.getPixels = GBAVideoSoftwareRendererGetPixels;
56 renderer->d.putPixels = GBAVideoSoftwareRendererPutPixels;
57
58 renderer->d.disableBG[0] = false;
59 renderer->d.disableBG[1] = false;
60 renderer->d.disableBG[2] = false;
61 renderer->d.disableBG[3] = false;
62 renderer->d.disableOBJ = false;
63}
64
65static void GBAVideoSoftwareRendererInit(struct GBAVideoRenderer* renderer) {
66 GBAVideoSoftwareRendererReset(renderer);
67
68 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
69
70 int y;
71 for (y = 0; y < VIDEO_VERTICAL_PIXELS; ++y) {
72 color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
73 int x;
74 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
75 row[x] = GBA_COLOR_WHITE;
76 }
77 }
78}
79
80static void GBAVideoSoftwareRendererReset(struct GBAVideoRenderer* renderer) {
81 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
82 int i;
83
84 softwareRenderer->dispcnt = 0x0080;
85
86 softwareRenderer->target1Obj = 0;
87 softwareRenderer->target1Bd = 0;
88 softwareRenderer->target2Obj = 0;
89 softwareRenderer->target2Bd = 0;
90 softwareRenderer->blendEffect = BLEND_NONE;
91 memset(softwareRenderer->normalPalette, 0, sizeof(softwareRenderer->normalPalette));
92 memset(softwareRenderer->variantPalette, 0, sizeof(softwareRenderer->variantPalette));
93
94 softwareRenderer->blda = 0;
95 softwareRenderer->bldb = 0;
96 softwareRenderer->bldy = 0;
97
98 softwareRenderer->winN[0] = (struct WindowN) { .control = { .priority = 0 } };
99 softwareRenderer->winN[1] = (struct WindowN) { .control = { .priority = 1 } };
100 softwareRenderer->objwin = (struct WindowControl) { .priority = 2 };
101 softwareRenderer->winout = (struct WindowControl) { .priority = 3 };
102 softwareRenderer->oamMax = 0;
103
104 softwareRenderer->mosaic = 0;
105
106 for (i = 0; i < 4; ++i) {
107 struct GBAVideoSoftwareBackground* bg = &softwareRenderer->bg[i];
108 bg->index = i;
109 bg->enabled = 0;
110 bg->priority = 0;
111 bg->charBase = 0;
112 bg->mosaic = 0;
113 bg->multipalette = 0;
114 bg->screenBase = 0;
115 bg->overflow = 0;
116 bg->size = 0;
117 bg->target1 = 0;
118 bg->target2 = 0;
119 bg->x = 0;
120 bg->y = 0;
121 bg->refx = 0;
122 bg->refy = 0;
123 bg->dx = 256;
124 bg->dmx = 0;
125 bg->dy = 0;
126 bg->dmy = 256;
127 bg->sx = 0;
128 bg->sy = 0;
129 }
130}
131
132static void GBAVideoSoftwareRendererDeinit(struct GBAVideoRenderer* renderer) {
133 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
134 UNUSED(softwareRenderer);
135}
136
137static uint16_t GBAVideoSoftwareRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
138 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
139 switch (address) {
140 case REG_DISPCNT:
141 softwareRenderer->dispcnt = value;
142 GBAVideoSoftwareRendererUpdateDISPCNT(softwareRenderer);
143 break;
144 case REG_BG0CNT:
145 value &= 0xFFCF;
146 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[0], value);
147 break;
148 case REG_BG1CNT:
149 value &= 0xFFCF;
150 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[1], value);
151 break;
152 case REG_BG2CNT:
153 value &= 0xFFCF;
154 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[2], value);
155 break;
156 case REG_BG3CNT:
157 value &= 0xFFCF;
158 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[3], value);
159 break;
160 case REG_BG0HOFS:
161 value &= 0x01FF;
162 softwareRenderer->bg[0].x = value;
163 break;
164 case REG_BG0VOFS:
165 value &= 0x01FF;
166 softwareRenderer->bg[0].y = value;
167 break;
168 case REG_BG1HOFS:
169 value &= 0x01FF;
170 softwareRenderer->bg[1].x = value;
171 break;
172 case REG_BG1VOFS:
173 value &= 0x01FF;
174 softwareRenderer->bg[1].y = value;
175 break;
176 case REG_BG2HOFS:
177 value &= 0x01FF;
178 softwareRenderer->bg[2].x = value;
179 break;
180 case REG_BG2VOFS:
181 value &= 0x01FF;
182 softwareRenderer->bg[2].y = value;
183 break;
184 case REG_BG3HOFS:
185 value &= 0x01FF;
186 softwareRenderer->bg[3].x = value;
187 break;
188 case REG_BG3VOFS:
189 value &= 0x01FF;
190 softwareRenderer->bg[3].y = value;
191 break;
192 case REG_BG2PA:
193 GBAVideoSoftwareRendererWriteBGPA(&softwareRenderer->bg[2], value);
194 break;
195 case REG_BG2PB:
196 GBAVideoSoftwareRendererWriteBGPB(&softwareRenderer->bg[2], value);
197 break;
198 case REG_BG2PC:
199 GBAVideoSoftwareRendererWriteBGPC(&softwareRenderer->bg[2], value);
200 break;
201 case REG_BG2PD:
202 GBAVideoSoftwareRendererWriteBGPD(&softwareRenderer->bg[2], value);
203 break;
204 case REG_BG2X_LO:
205 GBAVideoSoftwareRendererWriteBGX_LO(&softwareRenderer->bg[2], value);
206 break;
207 case REG_BG2X_HI:
208 GBAVideoSoftwareRendererWriteBGX_HI(&softwareRenderer->bg[2], value);
209 break;
210 case REG_BG2Y_LO:
211 GBAVideoSoftwareRendererWriteBGY_LO(&softwareRenderer->bg[2], value);
212 break;
213 case REG_BG2Y_HI:
214 GBAVideoSoftwareRendererWriteBGY_HI(&softwareRenderer->bg[2], value);
215 break;
216 case REG_BG3PA:
217 GBAVideoSoftwareRendererWriteBGPA(&softwareRenderer->bg[3], value);
218 break;
219 case REG_BG3PB:
220 GBAVideoSoftwareRendererWriteBGPB(&softwareRenderer->bg[3], value);
221 break;
222 case REG_BG3PC:
223 GBAVideoSoftwareRendererWriteBGPC(&softwareRenderer->bg[3], value);
224 break;
225 case REG_BG3PD:
226 GBAVideoSoftwareRendererWriteBGPD(&softwareRenderer->bg[3], value);
227 break;
228 case REG_BG3X_LO:
229 GBAVideoSoftwareRendererWriteBGX_LO(&softwareRenderer->bg[3], value);
230 break;
231 case REG_BG3X_HI:
232 GBAVideoSoftwareRendererWriteBGX_HI(&softwareRenderer->bg[3], value);
233 break;
234 case REG_BG3Y_LO:
235 GBAVideoSoftwareRendererWriteBGY_LO(&softwareRenderer->bg[3], value);
236 break;
237 case REG_BG3Y_HI:
238 GBAVideoSoftwareRendererWriteBGY_HI(&softwareRenderer->bg[3], value);
239 break;
240 case REG_BLDCNT:
241 GBAVideoSoftwareRendererWriteBLDCNT(softwareRenderer, value);
242 break;
243 case REG_BLDALPHA:
244 softwareRenderer->blda = value & 0x1F;
245 if (softwareRenderer->blda > 0x10) {
246 softwareRenderer->blda = 0x10;
247 }
248 softwareRenderer->bldb = (value >> 8) & 0x1F;
249 if (softwareRenderer->bldb > 0x10) {
250 softwareRenderer->bldb = 0x10;
251 }
252 break;
253 case REG_BLDY:
254 softwareRenderer->bldy = value & 0x1F;
255 if (softwareRenderer->bldy > 0x10) {
256 softwareRenderer->bldy = 0x10;
257 }
258 _updatePalettes(softwareRenderer);
259 break;
260 case REG_WIN0H:
261 softwareRenderer->winN[0].h.end = value;
262 softwareRenderer->winN[0].h.start = value >> 8;
263 if (softwareRenderer->winN[0].h.start > VIDEO_HORIZONTAL_PIXELS && softwareRenderer->winN[0].h.start > softwareRenderer->winN[0].h.end) {
264 softwareRenderer->winN[0].h.start = 0;
265 }
266 if (softwareRenderer->winN[0].h.end > VIDEO_HORIZONTAL_PIXELS) {
267 softwareRenderer->winN[0].h.end = VIDEO_HORIZONTAL_PIXELS;
268 if (softwareRenderer->winN[0].h.start > VIDEO_HORIZONTAL_PIXELS) {
269 softwareRenderer->winN[0].h.start = VIDEO_HORIZONTAL_PIXELS;
270 }
271 }
272 break;
273 case REG_WIN1H:
274 softwareRenderer->winN[1].h.end = value;
275 softwareRenderer->winN[1].h.start = value >> 8;
276 if (softwareRenderer->winN[1].h.start > VIDEO_HORIZONTAL_PIXELS && softwareRenderer->winN[1].h.start > softwareRenderer->winN[1].h.end) {
277 softwareRenderer->winN[1].h.start = 0;
278 }
279 if (softwareRenderer->winN[1].h.end > VIDEO_HORIZONTAL_PIXELS) {
280 softwareRenderer->winN[1].h.end = VIDEO_HORIZONTAL_PIXELS;
281 if (softwareRenderer->winN[1].h.start > VIDEO_HORIZONTAL_PIXELS) {
282 softwareRenderer->winN[1].h.start = VIDEO_HORIZONTAL_PIXELS;
283 }
284 }
285 break;
286 case REG_WIN0V:
287 softwareRenderer->winN[0].v.end = value;
288 softwareRenderer->winN[0].v.start = value >> 8;
289 if (softwareRenderer->winN[0].v.start > VIDEO_VERTICAL_PIXELS && softwareRenderer->winN[0].v.start > softwareRenderer->winN[0].v.end) {
290 softwareRenderer->winN[0].v.start = 0;
291 }
292 if (softwareRenderer->winN[0].v.end > VIDEO_VERTICAL_PIXELS) {
293 softwareRenderer->winN[0].v.end = VIDEO_VERTICAL_PIXELS;
294 if (softwareRenderer->winN[0].v.start > VIDEO_VERTICAL_PIXELS) {
295 softwareRenderer->winN[0].v.start = VIDEO_VERTICAL_PIXELS;
296 }
297 }
298 break;
299 case REG_WIN1V:
300 softwareRenderer->winN[1].v.end = value;
301 softwareRenderer->winN[1].v.start = value >> 8;
302 if (softwareRenderer->winN[1].v.start > VIDEO_VERTICAL_PIXELS && softwareRenderer->winN[1].v.start > softwareRenderer->winN[1].v.end) {
303 softwareRenderer->winN[1].v.start = 0;
304 }
305 if (softwareRenderer->winN[1].v.end > VIDEO_VERTICAL_PIXELS) {
306 softwareRenderer->winN[1].v.end = VIDEO_VERTICAL_PIXELS;
307 if (softwareRenderer->winN[1].v.start > VIDEO_VERTICAL_PIXELS) {
308 softwareRenderer->winN[1].v.start = VIDEO_VERTICAL_PIXELS;
309 }
310 }
311 break;
312 case REG_WININ:
313 softwareRenderer->winN[0].control.packed = value;
314 softwareRenderer->winN[1].control.packed = value >> 8;
315 break;
316 case REG_WINOUT:
317 softwareRenderer->winout.packed = value;
318 softwareRenderer->objwin.packed = value >> 8;
319 break;
320 case REG_MOSAIC:
321 softwareRenderer->mosaic = value;
322 break;
323 case REG_GREENSWP:
324 GBALog(0, GBA_LOG_STUB, "Stub video register write: 0x%03X", address);
325 break;
326 default:
327 GBALog(0, GBA_LOG_GAME_ERROR, "Invalid video register: 0x%03X", address);
328 }
329 return value;
330}
331
332static void GBAVideoSoftwareRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address) {
333 UNUSED(renderer);
334 UNUSED(address);
335}
336
337static void GBAVideoSoftwareRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam) {
338 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
339 softwareRenderer->oamDirty = 1;
340 UNUSED(oam);
341}
342
343static void GBAVideoSoftwareRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
344 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
345#ifdef COLOR_16_BIT
346#ifdef COLOR_5_6_5
347 unsigned color = 0;
348 color |= (value & 0x001F) << 11;
349 color |= (value & 0x03E0) << 1;
350 color |= (value & 0x7C00) >> 10;
351#else
352 unsigned color = value;
353#endif
354#else
355 unsigned color = 0;
356 color |= (value << 3) & 0xF8;
357 color |= (value << 6) & 0xF800;
358 color |= (value << 9) & 0xF80000;
359#endif
360 softwareRenderer->normalPalette[address >> 1] = color;
361 if (softwareRenderer->blendEffect == BLEND_BRIGHTEN) {
362 softwareRenderer->variantPalette[address >> 1] = _brighten(color, softwareRenderer->bldy);
363 } else if (softwareRenderer->blendEffect == BLEND_DARKEN) {
364 softwareRenderer->variantPalette[address >> 1] = _darken(color, softwareRenderer->bldy);
365 }
366}
367
368static void _breakWindow(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win, int y) {
369 if (win->v.end >= win->v.start) {
370 if (y >= win->v.end) {
371 return;
372 }
373 if (y < win->v.start) {
374 return;
375 }
376 } else if (y >= win->v.end && y < win->v.start) {
377 return;
378 }
379 if (win->h.end > VIDEO_HORIZONTAL_PIXELS || win->h.end < win->h.start) {
380 struct WindowN splits[2] = { *win, *win };
381 splits[0].h.start = 0;
382 splits[1].h.end = VIDEO_HORIZONTAL_PIXELS;
383 _breakWindowInner(softwareRenderer, &splits[0]);
384 _breakWindowInner(softwareRenderer, &splits[1]);
385 } else {
386 _breakWindowInner(softwareRenderer, win);
387 }
388}
389
390static void _breakWindowInner(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win) {
391 int activeWindow;
392 int startX = 0;
393 if (win->h.end > 0) {
394 for (activeWindow = 0; activeWindow < softwareRenderer->nWindows; ++activeWindow) {
395 if (win->h.start < softwareRenderer->windows[activeWindow].endX) {
396 // Insert a window before the end of the active window
397 struct Window oldWindow = softwareRenderer->windows[activeWindow];
398 if (win->h.start > startX) {
399 // And after the start of the active window
400 int nextWindow = softwareRenderer->nWindows;
401 ++softwareRenderer->nWindows;
402 for (; nextWindow > activeWindow; --nextWindow) {
403 softwareRenderer->windows[nextWindow] = softwareRenderer->windows[nextWindow - 1];
404 }
405 softwareRenderer->windows[activeWindow].endX = win->h.start;
406 ++activeWindow;
407 }
408 softwareRenderer->windows[activeWindow].control = win->control;
409 softwareRenderer->windows[activeWindow].endX = win->h.end;
410 if (win->h.end >= oldWindow.endX) {
411 // Trim off extra windows we've overwritten
412 for (++activeWindow; softwareRenderer->nWindows > activeWindow + 1 && win->h.end >= softwareRenderer->windows[activeWindow].endX; ++activeWindow) {
413 if (VIDEO_CHECKS && activeWindow >= MAX_WINDOW) {
414 GBALog(0, GBA_LOG_FATAL, "Out of bounds window write will occur");
415 return;
416 }
417 softwareRenderer->windows[activeWindow] = softwareRenderer->windows[activeWindow + 1];
418 --softwareRenderer->nWindows;
419 }
420 } else {
421 ++activeWindow;
422 int nextWindow = softwareRenderer->nWindows;
423 ++softwareRenderer->nWindows;
424 for (; nextWindow > activeWindow; --nextWindow) {
425 softwareRenderer->windows[nextWindow] = softwareRenderer->windows[nextWindow - 1];
426 }
427 softwareRenderer->windows[activeWindow] = oldWindow;
428 }
429 break;
430 }
431 startX = softwareRenderer->windows[activeWindow].endX;
432 }
433 }
434#ifdef DEBUG
435 if (softwareRenderer->nWindows > MAX_WINDOW) {
436 GBALog(0, GBA_LOG_FATAL, "Out of bounds window write occurred!");
437 }
438#endif
439}
440
441static void _cleanOAM(struct GBAVideoSoftwareRenderer* renderer) {
442 int i;
443 int oamMax = 0;
444 for (i = 0; i < 128; ++i) {
445 struct GBAObj obj;
446 LOAD_16(obj.a, 0, &renderer->d.oam->obj[i].a);
447 LOAD_16(obj.b, 0, &renderer->d.oam->obj[i].b);
448 LOAD_16(obj.c, 0, &renderer->d.oam->obj[i].c);
449 if (GBAObjAttributesAIsTransformed(obj.a) || !GBAObjAttributesAIsDisable(obj.a)) {
450 int height = GBAVideoObjSizes[GBAObjAttributesAGetShape(obj.a) * 4 + GBAObjAttributesBGetSize(obj.b)][1];
451 if (GBAObjAttributesAIsTransformed(obj.a)) {
452 height <<= GBAObjAttributesAGetDoubleSize(obj.a);
453 }
454 if (GBAObjAttributesAGetY(obj.a) < VIDEO_VERTICAL_PIXELS || GBAObjAttributesAGetY(obj.a) + height >= VIDEO_VERTICAL_TOTAL_PIXELS) {
455 renderer->sprites[oamMax].y = GBAObjAttributesAGetY(obj.a);
456 renderer->sprites[oamMax].endY = GBAObjAttributesAGetY(obj.a) + height;
457 renderer->sprites[oamMax].obj = obj;
458 ++oamMax;
459 }
460 }
461 }
462 renderer->oamMax = oamMax;
463 renderer->oamDirty = 0;
464}
465
466static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* renderer, int y) {
467 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
468
469 color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
470 if (GBARegisterDISPCNTIsForcedBlank(softwareRenderer->dispcnt)) {
471 int x;
472 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
473 row[x] = GBA_COLOR_WHITE;
474 }
475 return;
476 }
477
478 int x;
479 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; x += 4) {
480 softwareRenderer->spriteLayer[x] = FLAG_UNWRITTEN;
481 softwareRenderer->spriteLayer[x + 1] = FLAG_UNWRITTEN;
482 softwareRenderer->spriteLayer[x + 2] = FLAG_UNWRITTEN;
483 softwareRenderer->spriteLayer[x + 3] = FLAG_UNWRITTEN;
484 }
485
486 softwareRenderer->windows[0].endX = VIDEO_HORIZONTAL_PIXELS;
487 softwareRenderer->nWindows = 1;
488 if (GBARegisterDISPCNTIsWin0Enable(softwareRenderer->dispcnt) || GBARegisterDISPCNTIsWin1Enable(softwareRenderer->dispcnt) || GBARegisterDISPCNTIsObjwinEnable(softwareRenderer->dispcnt)) {
489 softwareRenderer->windows[0].control = softwareRenderer->winout;
490 if (GBARegisterDISPCNTIsWin1Enable(softwareRenderer->dispcnt)) {
491 _breakWindow(softwareRenderer, &softwareRenderer->winN[1], y);
492 }
493 if (GBARegisterDISPCNTIsWin0Enable(softwareRenderer->dispcnt)) {
494 _breakWindow(softwareRenderer, &softwareRenderer->winN[0], y);
495 }
496 } else {
497 softwareRenderer->windows[0].control.packed = 0xFF;
498 }
499
500 GBAVideoSoftwareRendererUpdateDISPCNT(softwareRenderer);
501
502 int w;
503 x = 0;
504 for (w = 0; w < softwareRenderer->nWindows; ++w) {
505 // TOOD: handle objwin on backdrop
506 uint32_t backdrop = FLAG_UNWRITTEN | FLAG_PRIORITY | FLAG_IS_BACKGROUND;
507 if (!softwareRenderer->target1Bd || softwareRenderer->blendEffect == BLEND_NONE || softwareRenderer->blendEffect == BLEND_ALPHA || !GBAWindowControlIsBlendEnable(softwareRenderer->windows[w].control.packed)) {
508 backdrop |= softwareRenderer->normalPalette[0];
509 } else {
510 backdrop |= softwareRenderer->variantPalette[0];
511 }
512 int end = softwareRenderer->windows[w].endX;
513 for (; x < end; ++x) {
514 softwareRenderer->row[x] = backdrop;
515 }
516 }
517
518 _drawScanline(softwareRenderer, y);
519
520 if (softwareRenderer->target2Bd) {
521 x = 0;
522 for (w = 0; w < softwareRenderer->nWindows; ++w) {
523 uint32_t backdrop = FLAG_UNWRITTEN;
524 if (!softwareRenderer->target1Bd || softwareRenderer->blendEffect == BLEND_NONE || softwareRenderer->blendEffect == BLEND_ALPHA || !GBAWindowControlIsBlendEnable(softwareRenderer->windows[w].control.packed)) {
525 backdrop |= softwareRenderer->normalPalette[0];
526 } else {
527 backdrop |= softwareRenderer->variantPalette[0];
528 }
529 int end = softwareRenderer->windows[w].endX;
530 for (; x < end; ++x) {
531 uint32_t color = softwareRenderer->row[x];
532 if (color & FLAG_TARGET_1 && color & FLAG_UNWRITTEN) {
533 softwareRenderer->row[x] = _mix(softwareRenderer->bldb, backdrop, softwareRenderer->blda, color);
534 }
535 }
536 }
537 }
538 if (softwareRenderer->target1Obj && (softwareRenderer->blendEffect == BLEND_DARKEN || softwareRenderer->blendEffect == BLEND_BRIGHTEN)) {
539 x = 0;
540 for (w = 0; w < softwareRenderer->nWindows; ++w) {
541 if (!GBAWindowControlIsBlendEnable(softwareRenderer->windows[w].control.packed)) {
542 continue;
543 }
544 int end = softwareRenderer->windows[w].endX;
545 if (softwareRenderer->blendEffect == BLEND_DARKEN) {
546 for (; x < end; ++x) {
547 uint32_t color = softwareRenderer->row[x];
548 if (color & FLAG_TARGET_1 && !(color & FLAG_UNWRITTEN)) {
549 softwareRenderer->row[x] = _darken(color, softwareRenderer->bldy);
550 }
551 }
552 } else if (softwareRenderer->blendEffect == BLEND_BRIGHTEN) {
553 for (; x < end; ++x) {
554 uint32_t color = softwareRenderer->row[x];
555 if (color & FLAG_TARGET_1 && !(color & FLAG_UNWRITTEN)) {
556 softwareRenderer->row[x] = _brighten(color, softwareRenderer->bldy);
557 }
558 }
559 }
560 }
561 }
562
563#ifdef COLOR_16_BIT
564#if defined(__ARM_NEON) && !defined(__APPLE__)
565 _to16Bit(row, softwareRenderer->row, VIDEO_HORIZONTAL_PIXELS);
566#else
567 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
568 row[x] = softwareRenderer->row[x];
569 }
570#endif
571#else
572 memcpy(row, softwareRenderer->row, VIDEO_HORIZONTAL_PIXELS * sizeof(*row));
573#endif
574}
575
576static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer) {
577 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
578
579 softwareRenderer->bg[2].sx = softwareRenderer->bg[2].refx;
580 softwareRenderer->bg[2].sy = softwareRenderer->bg[2].refy;
581 softwareRenderer->bg[3].sx = softwareRenderer->bg[3].refx;
582 softwareRenderer->bg[3].sy = softwareRenderer->bg[3].refy;
583}
584
585static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, void** pixels) {
586 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
587
588 *stride = softwareRenderer->outputBufferStride;
589 *pixels = softwareRenderer->outputBuffer;
590}
591
592static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer, unsigned stride, void* pixels) {
593 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
594
595 uint32_t* colorPixels = pixels;
596 unsigned i;
597 for (i = 0; i < VIDEO_VERTICAL_PIXELS; ++i) {
598 memmove(&softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * i], &colorPixels[stride * i], VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL);
599 }
600}
601
602static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRenderer* renderer) {
603 renderer->bg[0].enabled = GBARegisterDISPCNTGetBg0Enable(renderer->dispcnt) && !renderer->d.disableBG[0];
604 renderer->bg[1].enabled = GBARegisterDISPCNTGetBg1Enable(renderer->dispcnt) && !renderer->d.disableBG[1];
605 renderer->bg[2].enabled = GBARegisterDISPCNTGetBg2Enable(renderer->dispcnt) && !renderer->d.disableBG[2];
606 renderer->bg[3].enabled = GBARegisterDISPCNTGetBg3Enable(renderer->dispcnt) && !renderer->d.disableBG[3];
607}
608
609static void GBAVideoSoftwareRendererWriteBGCNT(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* bg, uint16_t value) {
610 UNUSED(renderer);
611 bg->priority = GBARegisterBGCNTGetPriority(value);
612 bg->charBase = GBARegisterBGCNTGetCharBase(value) << 14;
613 bg->mosaic = GBARegisterBGCNTGetMosaic(value);
614 bg->multipalette = GBARegisterBGCNTGet256Color(value);
615 bg->screenBase = GBARegisterBGCNTGetScreenBase(value) << 11;
616 bg->overflow = GBARegisterBGCNTGetOverflow(value);
617 bg->size = GBARegisterBGCNTGetSize(value);
618}
619
620static void GBAVideoSoftwareRendererWriteBGPA(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
621 bg->dx = value;
622}
623
624static void GBAVideoSoftwareRendererWriteBGPB(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
625 bg->dmx = value;
626}
627
628static void GBAVideoSoftwareRendererWriteBGPC(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
629 bg->dy = value;
630}
631
632static void GBAVideoSoftwareRendererWriteBGPD(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
633 bg->dmy = value;
634}
635
636static void GBAVideoSoftwareRendererWriteBGX_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
637 bg->refx = (bg->refx & 0xFFFF0000) | value;
638 bg->sx = bg->refx;
639}
640
641static void GBAVideoSoftwareRendererWriteBGX_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
642 bg->refx = (bg->refx & 0x0000FFFF) | (value << 16);
643 bg->refx <<= 4;
644 bg->refx >>= 4;
645 bg->sx = bg->refx;
646}
647
648static void GBAVideoSoftwareRendererWriteBGY_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
649 bg->refy = (bg->refy & 0xFFFF0000) | value;
650 bg->sy = bg->refy;
651}
652
653static void GBAVideoSoftwareRendererWriteBGY_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
654 bg->refy = (bg->refy & 0x0000FFFF) | (value << 16);
655 bg->refy <<= 4;
656 bg->refy >>= 4;
657 bg->sy = bg->refy;
658}
659
660static void GBAVideoSoftwareRendererWriteBLDCNT(struct GBAVideoSoftwareRenderer* renderer, uint16_t value) {
661 enum BlendEffect oldEffect = renderer->blendEffect;
662
663 renderer->bg[0].target1 = GBARegisterBLDCNTGetTarget1Bg0(value);
664 renderer->bg[1].target1 = GBARegisterBLDCNTGetTarget1Bg1(value);
665 renderer->bg[2].target1 = GBARegisterBLDCNTGetTarget1Bg2(value);
666 renderer->bg[3].target1 = GBARegisterBLDCNTGetTarget1Bg3(value);
667 renderer->bg[0].target2 = GBARegisterBLDCNTGetTarget2Bg0(value);
668 renderer->bg[1].target2 = GBARegisterBLDCNTGetTarget2Bg1(value);
669 renderer->bg[2].target2 = GBARegisterBLDCNTGetTarget2Bg2(value);
670 renderer->bg[3].target2 = GBARegisterBLDCNTGetTarget2Bg3(value);
671
672 renderer->blendEffect = GBARegisterBLDCNTGetEffect(value);
673 renderer->target1Obj = GBARegisterBLDCNTGetTarget1Obj(value);
674 renderer->target1Bd = GBARegisterBLDCNTGetTarget1Bd(value);
675 renderer->target2Obj = GBARegisterBLDCNTGetTarget2Obj(value);
676 renderer->target2Bd = GBARegisterBLDCNTGetTarget2Bd(value);
677
678 renderer->anyTarget2 = value & 0x3F00;
679
680 if (oldEffect != renderer->blendEffect) {
681 _updatePalettes(renderer);
682 }
683}
684
685#define TEST_LAYER_ENABLED(X) \
686 (renderer->bg[X].enabled && \
687 (GBAWindowControlIsBg ## X ## Enable(renderer->currentWindow.packed) || \
688 (GBARegisterDISPCNTIsObjwinEnable(renderer->dispcnt) && GBAWindowControlIsBg ## X ## Enable (renderer->objwin.packed))) && \
689 renderer->bg[X].priority == priority)
690
691static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y) {
692 int w;
693 renderer->end = 0;
694 int spriteLayers = 0;
695 if (GBARegisterDISPCNTIsObjEnable(renderer->dispcnt) && !renderer->d.disableOBJ) {
696 if (renderer->oamDirty) {
697 _cleanOAM(renderer);
698 }
699 int mosaicV = GBAMosaicControlGetObjV(renderer->mosaic) + 1;
700 int mosaicY = y - (y % mosaicV);
701 for (w = 0; w < renderer->nWindows; ++w) {
702 renderer->start = renderer->end;
703 renderer->end = renderer->windows[w].endX;
704 renderer->currentWindow = renderer->windows[w].control;
705 if (!GBAWindowControlIsObjEnable(renderer->currentWindow.packed) && !GBARegisterDISPCNTIsObjwinEnable(renderer->dispcnt)) {
706 continue;
707 }
708 int i;
709 int drawn;
710 for (i = 0; i < renderer->oamMax; ++i) {
711 int localY = y;
712 struct GBAVideoSoftwareSprite* sprite = &renderer->sprites[i];
713 if (GBAObjAttributesAIsMosaic(sprite->obj.a)) {
714 localY = mosaicY;
715 }
716 if ((localY < sprite->y && (sprite->endY - 256 < 0 || localY >= sprite->endY - 256)) || localY >= sprite->endY) {
717 continue;
718 }
719 drawn = GBAVideoSoftwareRendererPreprocessSprite(renderer, &sprite->obj, localY);
720 spriteLayers |= drawn << GBAObjAttributesCGetPriority(sprite->obj.c);
721 }
722 }
723 }
724
725 int priority;
726 for (priority = 0; priority < 4; ++priority) {
727 renderer->end = 0;
728 for (w = 0; w < renderer->nWindows; ++w) {
729 renderer->start = renderer->end;
730 renderer->end = renderer->windows[w].endX;
731 renderer->currentWindow = renderer->windows[w].control;
732 if (spriteLayers & (1 << priority)) {
733 GBAVideoSoftwareRendererPostprocessSprite(renderer, priority);
734 }
735 if (TEST_LAYER_ENABLED(0) && GBARegisterDISPCNTGetMode(renderer->dispcnt) < 2) {
736 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[0], y);
737 }
738 if (TEST_LAYER_ENABLED(1) && GBARegisterDISPCNTGetMode(renderer->dispcnt) < 2) {
739 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[1], y);
740 }
741 if (TEST_LAYER_ENABLED(2)) {
742 switch (GBARegisterDISPCNTGetMode(renderer->dispcnt)) {
743 case 0:
744 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[2], y);
745 break;
746 case 1:
747 case 2:
748 GBAVideoSoftwareRendererDrawBackgroundMode2(renderer, &renderer->bg[2], y);
749 break;
750 case 3:
751 GBAVideoSoftwareRendererDrawBackgroundMode3(renderer, &renderer->bg[2], y);
752 break;
753 case 4:
754 GBAVideoSoftwareRendererDrawBackgroundMode4(renderer, &renderer->bg[2], y);
755 break;
756 case 5:
757 GBAVideoSoftwareRendererDrawBackgroundMode5(renderer, &renderer->bg[2], y);
758 break;
759 }
760 }
761 if (TEST_LAYER_ENABLED(3)) {
762 switch (GBARegisterDISPCNTGetMode(renderer->dispcnt)) {
763 case 0:
764 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[3], y);
765 break;
766 case 2:
767 GBAVideoSoftwareRendererDrawBackgroundMode2(renderer, &renderer->bg[3], y);
768 break;
769 }
770 }
771 }
772 }
773 renderer->bg[2].sx += renderer->bg[2].dmx;
774 renderer->bg[2].sy += renderer->bg[2].dmy;
775 renderer->bg[3].sx += renderer->bg[3].dmx;
776 renderer->bg[3].sy += renderer->bg[3].dmy;
777}
778
779static void _updatePalettes(struct GBAVideoSoftwareRenderer* renderer) {
780 int i;
781 if (renderer->blendEffect == BLEND_BRIGHTEN) {
782 for (i = 0; i < 512; ++i) {
783 renderer->variantPalette[i] = _brighten(renderer->normalPalette[i], renderer->bldy);
784 }
785 } else if (renderer->blendEffect == BLEND_DARKEN) {
786 for (i = 0; i < 512; ++i) {
787 renderer->variantPalette[i] = _darken(renderer->normalPalette[i], renderer->bldy);
788 }
789 } else {
790 for (i = 0; i < 512; ++i) {
791 renderer->variantPalette[i] = renderer->normalPalette[i];
792 }
793 }
794}