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 "gba/renderers/software-private.h"
7
8#include <mgba/core/cache-set.h>
9#include <mgba/internal/arm/macros.h>
10#include <mgba/internal/gba/io.h>
11#include <mgba/internal/gba/renderers/cache-set.h>
12
13#include <mgba-util/arm-algo.h>
14#include <mgba-util/memory.h>
15
16#define DIRTY_SCANLINE(R, Y) R->scanlineDirty[Y >> 5] |= (1 << (Y & 0x1F))
17#define CLEAN_SCANLINE(R, Y) R->scanlineDirty[Y >> 5] &= ~(1 << (Y & 0x1F))
18
19static void GBAVideoSoftwareRendererInit(struct GBAVideoRenderer* renderer);
20static void GBAVideoSoftwareRendererDeinit(struct GBAVideoRenderer* renderer);
21static void GBAVideoSoftwareRendererReset(struct GBAVideoRenderer* renderer);
22static void GBAVideoSoftwareRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address);
23static void GBAVideoSoftwareRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam);
24static void GBAVideoSoftwareRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
25static uint16_t GBAVideoSoftwareRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
26static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* renderer, int y);
27static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer);
28static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels);
29static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels);
30
31static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRenderer* renderer);
32static void GBAVideoSoftwareRendererWriteBGCNT(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* bg, uint16_t value);
33static void GBAVideoSoftwareRendererWriteBGX_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value);
34static void GBAVideoSoftwareRendererWriteBGX_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value);
35static void GBAVideoSoftwareRendererWriteBGY_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value);
36static void GBAVideoSoftwareRendererWriteBGY_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value);
37static void GBAVideoSoftwareRendererWriteBLDCNT(struct GBAVideoSoftwareRenderer* renderer, uint16_t value);
38
39static void _cleanOAM(struct GBAVideoSoftwareRenderer* renderer);
40static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y);
41
42static void _updatePalettes(struct GBAVideoSoftwareRenderer* renderer);
43
44static void _breakWindow(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win, int y);
45static void _breakWindowInner(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win);
46
47void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer) {
48 renderer->d.init = GBAVideoSoftwareRendererInit;
49 renderer->d.reset = GBAVideoSoftwareRendererReset;
50 renderer->d.deinit = GBAVideoSoftwareRendererDeinit;
51 renderer->d.writeVideoRegister = GBAVideoSoftwareRendererWriteVideoRegister;
52 renderer->d.writeVRAM = GBAVideoSoftwareRendererWriteVRAM;
53 renderer->d.writeOAM = GBAVideoSoftwareRendererWriteOAM;
54 renderer->d.writePalette = GBAVideoSoftwareRendererWritePalette;
55 renderer->d.drawScanline = GBAVideoSoftwareRendererDrawScanline;
56 renderer->d.finishFrame = GBAVideoSoftwareRendererFinishFrame;
57 renderer->d.getPixels = GBAVideoSoftwareRendererGetPixels;
58 renderer->d.putPixels = GBAVideoSoftwareRendererPutPixels;
59
60 renderer->d.disableBG[0] = false;
61 renderer->d.disableBG[1] = false;
62 renderer->d.disableBG[2] = false;
63 renderer->d.disableBG[3] = false;
64 renderer->d.disableOBJ = false;
65
66 renderer->temporaryBuffer = 0;
67}
68
69static void GBAVideoSoftwareRendererInit(struct GBAVideoRenderer* renderer) {
70 GBAVideoSoftwareRendererReset(renderer);
71
72 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
73
74 int y;
75 for (y = 0; y < VIDEO_VERTICAL_PIXELS; ++y) {
76 color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
77 int x;
78 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
79 row[x] = GBA_COLOR_WHITE;
80 }
81 }
82}
83
84static void GBAVideoSoftwareRendererReset(struct GBAVideoRenderer* renderer) {
85 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
86 int i;
87
88 softwareRenderer->dispcnt = 0x0080;
89
90 softwareRenderer->target1Obj = 0;
91 softwareRenderer->target1Bd = 0;
92 softwareRenderer->target2Obj = 0;
93 softwareRenderer->target2Bd = 0;
94 softwareRenderer->blendEffect = BLEND_NONE;
95 for (i = 0; i < 1024; i += 2) {
96 uint16_t entry;
97 LOAD_16(entry, i, softwareRenderer->d.palette);
98 GBAVideoSoftwareRendererWritePalette(renderer, i, entry);
99 }
100 softwareRenderer->blendDirty = false;
101 _updatePalettes(softwareRenderer);
102
103 softwareRenderer->blda = 0;
104 softwareRenderer->bldb = 0;
105 softwareRenderer->bldy = 0;
106
107 softwareRenderer->winN[0] = (struct WindowN) { .control = { .priority = 0 } };
108 softwareRenderer->winN[1] = (struct WindowN) { .control = { .priority = 1 } };
109 softwareRenderer->objwin = (struct WindowControl) { .priority = 2 };
110 softwareRenderer->winout = (struct WindowControl) { .priority = 3 };
111 softwareRenderer->oamMax = 0;
112
113 softwareRenderer->mosaic = 0;
114 softwareRenderer->nextY = 0;
115
116 memset(softwareRenderer->scanlineDirty, 0xFFFFFFFF, sizeof(softwareRenderer->scanlineDirty));
117 memset(softwareRenderer->cache, 0, sizeof(softwareRenderer->cache));
118 memset(softwareRenderer->nextIo, 0, sizeof(softwareRenderer->nextIo));
119
120 for (i = 0; i < 4; ++i) {
121 struct GBAVideoSoftwareBackground* bg = &softwareRenderer->bg[i];
122 bg->index = i;
123 bg->enabled = 0;
124 bg->priority = 0;
125 bg->charBase = 0;
126 bg->mosaic = 0;
127 bg->multipalette = 0;
128 bg->screenBase = 0;
129 bg->overflow = 0;
130 bg->size = 0;
131 bg->target1 = 0;
132 bg->target2 = 0;
133 bg->x = 0;
134 bg->y = 0;
135 bg->refx = 0;
136 bg->refy = 0;
137 bg->dx = 256;
138 bg->dmx = 0;
139 bg->dy = 0;
140 bg->dmy = 256;
141 bg->sx = 0;
142 bg->sy = 0;
143 }
144}
145
146static void GBAVideoSoftwareRendererDeinit(struct GBAVideoRenderer* renderer) {
147 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
148 UNUSED(softwareRenderer);
149}
150
151static uint16_t GBAVideoSoftwareRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
152 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
153 if (renderer->cache) {
154 GBAVideoCacheWriteVideoRegister(renderer->cache, address, value);
155 }
156
157 switch (address) {
158 case REG_DISPCNT:
159 softwareRenderer->dispcnt = value;
160 GBAVideoSoftwareRendererUpdateDISPCNT(softwareRenderer);
161 break;
162 case REG_BG0CNT:
163 value &= 0xDFFF;
164 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[0], value);
165 break;
166 case REG_BG1CNT:
167 value &= 0xDFFF;
168 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[1], value);
169 break;
170 case REG_BG2CNT:
171 value &= 0xFFFF;
172 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[2], value);
173 break;
174 case REG_BG3CNT:
175 value &= 0xFFFF;
176 GBAVideoSoftwareRendererWriteBGCNT(softwareRenderer, &softwareRenderer->bg[3], value);
177 break;
178 case REG_BG0HOFS:
179 value &= 0x01FF;
180 softwareRenderer->bg[0].x = value;
181 break;
182 case REG_BG0VOFS:
183 value &= 0x01FF;
184 softwareRenderer->bg[0].y = value;
185 break;
186 case REG_BG1HOFS:
187 value &= 0x01FF;
188 softwareRenderer->bg[1].x = value;
189 break;
190 case REG_BG1VOFS:
191 value &= 0x01FF;
192 softwareRenderer->bg[1].y = value;
193 break;
194 case REG_BG2HOFS:
195 value &= 0x01FF;
196 softwareRenderer->bg[2].x = value;
197 break;
198 case REG_BG2VOFS:
199 value &= 0x01FF;
200 softwareRenderer->bg[2].y = value;
201 break;
202 case REG_BG3HOFS:
203 value &= 0x01FF;
204 softwareRenderer->bg[3].x = value;
205 break;
206 case REG_BG3VOFS:
207 value &= 0x01FF;
208 softwareRenderer->bg[3].y = value;
209 break;
210 case REG_BG2PA:
211 softwareRenderer->bg[2].dx = value;
212 break;
213 case REG_BG2PB:
214 softwareRenderer->bg[2].dmx = value;
215 break;
216 case REG_BG2PC:
217 softwareRenderer->bg[2].dy = value;
218 break;
219 case REG_BG2PD:
220 softwareRenderer->bg[2].dmy = value;
221 break;
222 case REG_BG2X_LO:
223 GBAVideoSoftwareRendererWriteBGX_LO(&softwareRenderer->bg[2], value);
224 if (softwareRenderer->bg[2].sx != softwareRenderer->cache[softwareRenderer->nextY].scale[0][0]) {
225 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
226 }
227 break;
228 case REG_BG2X_HI:
229 GBAVideoSoftwareRendererWriteBGX_HI(&softwareRenderer->bg[2], value);
230 if (softwareRenderer->bg[2].sx != softwareRenderer->cache[softwareRenderer->nextY].scale[0][0]) {
231 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
232 }
233 break;
234 case REG_BG2Y_LO:
235 GBAVideoSoftwareRendererWriteBGY_LO(&softwareRenderer->bg[2], value);
236 if (softwareRenderer->bg[2].sy != softwareRenderer->cache[softwareRenderer->nextY].scale[0][1]) {
237 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
238 }
239 break;
240 case REG_BG2Y_HI:
241 GBAVideoSoftwareRendererWriteBGY_HI(&softwareRenderer->bg[2], value);
242 if (softwareRenderer->bg[2].sy != softwareRenderer->cache[softwareRenderer->nextY].scale[0][1]) {
243 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
244 }
245 break;
246 case REG_BG3PA:
247 softwareRenderer->bg[3].dx = value;
248 break;
249 case REG_BG3PB:
250 softwareRenderer->bg[3].dmx = value;
251 break;
252 case REG_BG3PC:
253 softwareRenderer->bg[3].dy = value;
254 break;
255 case REG_BG3PD:
256 softwareRenderer->bg[3].dmy = value;
257 break;
258 case REG_BG3X_LO:
259 GBAVideoSoftwareRendererWriteBGX_LO(&softwareRenderer->bg[3], value);
260 if (softwareRenderer->bg[3].sx != softwareRenderer->cache[softwareRenderer->nextY].scale[1][0]) {
261 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
262 }
263 break;
264 case REG_BG3X_HI:
265 GBAVideoSoftwareRendererWriteBGX_HI(&softwareRenderer->bg[3], value);
266 if (softwareRenderer->bg[3].sx != softwareRenderer->cache[softwareRenderer->nextY].scale[1][0]) {
267 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
268 }
269 break;
270 case REG_BG3Y_LO:
271 GBAVideoSoftwareRendererWriteBGY_LO(&softwareRenderer->bg[3], value);
272 if (softwareRenderer->bg[3].sy != softwareRenderer->cache[softwareRenderer->nextY].scale[1][1]) {
273 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
274 }
275 break;
276 case REG_BG3Y_HI:
277 GBAVideoSoftwareRendererWriteBGY_HI(&softwareRenderer->bg[3], value);
278 if (softwareRenderer->bg[3].sy != softwareRenderer->cache[softwareRenderer->nextY].scale[1][1]) {
279 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
280 }
281 break;
282 case REG_BLDCNT:
283 GBAVideoSoftwareRendererWriteBLDCNT(softwareRenderer, value);
284 value &= 0x3FFF;
285 break;
286 case REG_BLDALPHA:
287 softwareRenderer->blda = value & 0x1F;
288 if (softwareRenderer->blda > 0x10) {
289 softwareRenderer->blda = 0x10;
290 }
291 softwareRenderer->bldb = (value >> 8) & 0x1F;
292 if (softwareRenderer->bldb > 0x10) {
293 softwareRenderer->bldb = 0x10;
294 }
295 value &= 0x1F1F;
296 break;
297 case REG_BLDY:
298 if (value > 0x10) {
299 value = 0x10;
300 }
301 if (softwareRenderer->bldy != value) {
302 softwareRenderer->bldy = value;
303 softwareRenderer->blendDirty = true;
304 }
305 break;
306 case REG_WIN0H:
307 softwareRenderer->winN[0].h.end = value;
308 softwareRenderer->winN[0].h.start = value >> 8;
309 if (softwareRenderer->winN[0].h.start > VIDEO_HORIZONTAL_PIXELS && softwareRenderer->winN[0].h.start > softwareRenderer->winN[0].h.end) {
310 softwareRenderer->winN[0].h.start = 0;
311 }
312 if (softwareRenderer->winN[0].h.end > VIDEO_HORIZONTAL_PIXELS) {
313 softwareRenderer->winN[0].h.end = VIDEO_HORIZONTAL_PIXELS;
314 if (softwareRenderer->winN[0].h.start > VIDEO_HORIZONTAL_PIXELS) {
315 softwareRenderer->winN[0].h.start = VIDEO_HORIZONTAL_PIXELS;
316 }
317 }
318 break;
319 case REG_WIN1H:
320 softwareRenderer->winN[1].h.end = value;
321 softwareRenderer->winN[1].h.start = value >> 8;
322 if (softwareRenderer->winN[1].h.start > VIDEO_HORIZONTAL_PIXELS && softwareRenderer->winN[1].h.start > softwareRenderer->winN[1].h.end) {
323 softwareRenderer->winN[1].h.start = 0;
324 }
325 if (softwareRenderer->winN[1].h.end > VIDEO_HORIZONTAL_PIXELS) {
326 softwareRenderer->winN[1].h.end = VIDEO_HORIZONTAL_PIXELS;
327 if (softwareRenderer->winN[1].h.start > VIDEO_HORIZONTAL_PIXELS) {
328 softwareRenderer->winN[1].h.start = VIDEO_HORIZONTAL_PIXELS;
329 }
330 }
331 break;
332 case REG_WIN0V:
333 softwareRenderer->winN[0].v.end = value;
334 softwareRenderer->winN[0].v.start = value >> 8;
335 if (softwareRenderer->winN[0].v.start > VIDEO_VERTICAL_PIXELS && softwareRenderer->winN[0].v.start > softwareRenderer->winN[0].v.end) {
336 softwareRenderer->winN[0].v.start = 0;
337 }
338 if (softwareRenderer->winN[0].v.end > VIDEO_VERTICAL_PIXELS) {
339 softwareRenderer->winN[0].v.end = VIDEO_VERTICAL_PIXELS;
340 if (softwareRenderer->winN[0].v.start > VIDEO_VERTICAL_PIXELS) {
341 softwareRenderer->winN[0].v.start = VIDEO_VERTICAL_PIXELS;
342 }
343 }
344 break;
345 case REG_WIN1V:
346 softwareRenderer->winN[1].v.end = value;
347 softwareRenderer->winN[1].v.start = value >> 8;
348 if (softwareRenderer->winN[1].v.start > VIDEO_VERTICAL_PIXELS && softwareRenderer->winN[1].v.start > softwareRenderer->winN[1].v.end) {
349 softwareRenderer->winN[1].v.start = 0;
350 }
351 if (softwareRenderer->winN[1].v.end > VIDEO_VERTICAL_PIXELS) {
352 softwareRenderer->winN[1].v.end = VIDEO_VERTICAL_PIXELS;
353 if (softwareRenderer->winN[1].v.start > VIDEO_VERTICAL_PIXELS) {
354 softwareRenderer->winN[1].v.start = VIDEO_VERTICAL_PIXELS;
355 }
356 }
357 break;
358 case REG_WININ:
359 value &= 0x3F3F;
360 softwareRenderer->winN[0].control.packed = value;
361 softwareRenderer->winN[1].control.packed = value >> 8;
362 break;
363 case REG_WINOUT:
364 value &= 0x3F3F;
365 softwareRenderer->winout.packed = value;
366 softwareRenderer->objwin.packed = value >> 8;
367 break;
368 case REG_MOSAIC:
369 softwareRenderer->mosaic = value;
370 break;
371 case REG_GREENSWP:
372 mLOG(GBA_VIDEO, STUB, "Stub video register write: 0x%03X", address);
373 break;
374 default:
375 mLOG(GBA_VIDEO, GAME_ERROR, "Invalid video register: 0x%03X", address);
376 }
377 softwareRenderer->nextIo[address >> 1] = value;
378 if (softwareRenderer->cache[softwareRenderer->nextY].io[address >> 1] != value) {
379 softwareRenderer->cache[softwareRenderer->nextY].io[address >> 1] = value;
380 DIRTY_SCANLINE(softwareRenderer, softwareRenderer->nextY);
381 }
382 return value;
383}
384
385static void GBAVideoSoftwareRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address) {
386 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
387 if (renderer->cache) {
388 mCacheSetWriteVRAM(renderer->cache, address);
389 }
390 memset(softwareRenderer->scanlineDirty, 0xFFFFFFFF, sizeof(softwareRenderer->scanlineDirty));
391}
392
393static void GBAVideoSoftwareRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam) {
394 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
395 UNUSED(oam);
396 softwareRenderer->oamDirty = 1;
397 memset(softwareRenderer->scanlineDirty, 0xFFFFFFFF, sizeof(softwareRenderer->scanlineDirty));
398}
399
400static void GBAVideoSoftwareRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
401 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
402 color_t color = mColorFrom555(value);
403 softwareRenderer->normalPalette[address >> 1] = color;
404 if (softwareRenderer->blendEffect == BLEND_BRIGHTEN) {
405 softwareRenderer->variantPalette[address >> 1] = _brighten(color, softwareRenderer->bldy);
406 } else if (softwareRenderer->blendEffect == BLEND_DARKEN) {
407 softwareRenderer->variantPalette[address >> 1] = _darken(color, softwareRenderer->bldy);
408 }
409 if (renderer->cache) {
410 mCacheSetWritePalette(renderer->cache, address >> 1, color);
411 }
412 memset(softwareRenderer->scanlineDirty, 0xFFFFFFFF, sizeof(softwareRenderer->scanlineDirty));
413}
414
415static void _breakWindow(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win, int y) {
416 if (win->v.end >= win->v.start) {
417 if (y >= win->v.end) {
418 return;
419 }
420 if (y < win->v.start) {
421 return;
422 }
423 } else if (y >= win->v.end && y < win->v.start) {
424 return;
425 }
426 if (win->h.end > VIDEO_HORIZONTAL_PIXELS || win->h.end < win->h.start) {
427 struct WindowN splits[2] = { *win, *win };
428 splits[0].h.start = 0;
429 splits[1].h.end = VIDEO_HORIZONTAL_PIXELS;
430 _breakWindowInner(softwareRenderer, &splits[0]);
431 _breakWindowInner(softwareRenderer, &splits[1]);
432 } else {
433 _breakWindowInner(softwareRenderer, win);
434 }
435}
436
437static void _breakWindowInner(struct GBAVideoSoftwareRenderer* softwareRenderer, struct WindowN* win) {
438 int activeWindow;
439 int startX = 0;
440 if (win->h.end > 0) {
441 for (activeWindow = 0; activeWindow < softwareRenderer->nWindows; ++activeWindow) {
442 if (win->h.start < softwareRenderer->windows[activeWindow].endX) {
443 // Insert a window before the end of the active window
444 struct Window oldWindow = softwareRenderer->windows[activeWindow];
445 if (win->h.start > startX) {
446 // And after the start of the active window
447 int nextWindow = softwareRenderer->nWindows;
448 ++softwareRenderer->nWindows;
449 for (; nextWindow > activeWindow; --nextWindow) {
450 softwareRenderer->windows[nextWindow] = softwareRenderer->windows[nextWindow - 1];
451 }
452 softwareRenderer->windows[activeWindow].endX = win->h.start;
453 ++activeWindow;
454 }
455 softwareRenderer->windows[activeWindow].control = win->control;
456 softwareRenderer->windows[activeWindow].endX = win->h.end;
457 if (win->h.end >= oldWindow.endX) {
458 // Trim off extra windows we've overwritten
459 for (++activeWindow; softwareRenderer->nWindows > activeWindow + 1 && win->h.end >= softwareRenderer->windows[activeWindow].endX; ++activeWindow) {
460 if (VIDEO_CHECKS && activeWindow >= MAX_WINDOW) {
461 mLOG(GBA_VIDEO, FATAL, "Out of bounds window write will occur");
462 return;
463 }
464 softwareRenderer->windows[activeWindow] = softwareRenderer->windows[activeWindow + 1];
465 --softwareRenderer->nWindows;
466 }
467 } else {
468 ++activeWindow;
469 int nextWindow = softwareRenderer->nWindows;
470 ++softwareRenderer->nWindows;
471 for (; nextWindow > activeWindow; --nextWindow) {
472 softwareRenderer->windows[nextWindow] = softwareRenderer->windows[nextWindow - 1];
473 }
474 softwareRenderer->windows[activeWindow] = oldWindow;
475 }
476 break;
477 }
478 startX = softwareRenderer->windows[activeWindow].endX;
479 }
480 }
481#ifdef DEBUG
482 if (softwareRenderer->nWindows > MAX_WINDOW) {
483 mLOG(GBA_VIDEO, FATAL, "Out of bounds window write occurred!");
484 }
485#endif
486}
487
488static void _cleanOAM(struct GBAVideoSoftwareRenderer* renderer) {
489 int i;
490 int oamMax = 0;
491 for (i = 0; i < 128; ++i) {
492 struct GBAObj obj;
493 LOAD_16(obj.a, 0, &renderer->d.oam->obj[i].a);
494 LOAD_16(obj.b, 0, &renderer->d.oam->obj[i].b);
495 LOAD_16(obj.c, 0, &renderer->d.oam->obj[i].c);
496 if (GBAObjAttributesAIsTransformed(obj.a) || !GBAObjAttributesAIsDisable(obj.a)) {
497 int height = GBAVideoObjSizes[GBAObjAttributesAGetShape(obj.a) * 4 + GBAObjAttributesBGetSize(obj.b)][1];
498 if (GBAObjAttributesAIsTransformed(obj.a)) {
499 height <<= GBAObjAttributesAGetDoubleSize(obj.a);
500 }
501 if (GBAObjAttributesAGetY(obj.a) < VIDEO_VERTICAL_PIXELS || GBAObjAttributesAGetY(obj.a) + height >= VIDEO_VERTICAL_TOTAL_PIXELS) {
502 renderer->sprites[oamMax].y = GBAObjAttributesAGetY(obj.a);
503 renderer->sprites[oamMax].endY = GBAObjAttributesAGetY(obj.a) + height;
504 renderer->sprites[oamMax].obj = obj;
505 ++oamMax;
506 }
507 }
508 }
509 renderer->oamMax = oamMax;
510 renderer->oamDirty = 0;
511}
512
513static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* renderer, int y) {
514 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
515
516 if (y == VIDEO_VERTICAL_PIXELS - 1) {
517 softwareRenderer->nextY = 0;
518 } else {
519 softwareRenderer->nextY = y + 1;
520 }
521
522 bool dirty = softwareRenderer->scanlineDirty[y >> 5] & (1 << (y & 0x1F));
523 if (memcmp(softwareRenderer->nextIo, softwareRenderer->cache[y].io, sizeof(softwareRenderer->nextIo))) {
524 memcpy(softwareRenderer->cache[y].io, softwareRenderer->nextIo, sizeof(softwareRenderer->nextIo));
525 dirty = true;
526 }
527
528 softwareRenderer->cache[y].scale[0][0] = softwareRenderer->bg[2].sx;
529 softwareRenderer->cache[y].scale[0][1] = softwareRenderer->bg[2].sy;
530 softwareRenderer->cache[y].scale[1][0] = softwareRenderer->bg[3].sx;
531 softwareRenderer->cache[y].scale[1][1] = softwareRenderer->bg[3].sy;
532
533 if (!dirty) {
534 if (GBARegisterDISPCNTGetMode(softwareRenderer->dispcnt) != 0) {
535 softwareRenderer->bg[2].sx += softwareRenderer->bg[2].dmx;
536 softwareRenderer->bg[2].sy += softwareRenderer->bg[2].dmy;
537 softwareRenderer->bg[3].sx += softwareRenderer->bg[3].dmx;
538 softwareRenderer->bg[3].sy += softwareRenderer->bg[3].dmy;
539 }
540 return;
541 }
542
543 color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
544 if (GBARegisterDISPCNTIsForcedBlank(softwareRenderer->dispcnt)) {
545 int x;
546 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
547 row[x] = GBA_COLOR_WHITE;
548 }
549 return;
550 }
551
552 int x;
553 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; x += 4) {
554 softwareRenderer->spriteLayer[x] = FLAG_UNWRITTEN;
555 softwareRenderer->spriteLayer[x + 1] = FLAG_UNWRITTEN;
556 softwareRenderer->spriteLayer[x + 2] = FLAG_UNWRITTEN;
557 softwareRenderer->spriteLayer[x + 3] = FLAG_UNWRITTEN;
558 }
559
560 softwareRenderer->windows[0].endX = VIDEO_HORIZONTAL_PIXELS;
561 softwareRenderer->nWindows = 1;
562 if (GBARegisterDISPCNTIsWin0Enable(softwareRenderer->dispcnt) || GBARegisterDISPCNTIsWin1Enable(softwareRenderer->dispcnt) || GBARegisterDISPCNTIsObjwinEnable(softwareRenderer->dispcnt)) {
563 softwareRenderer->windows[0].control = softwareRenderer->winout;
564 if (GBARegisterDISPCNTIsWin1Enable(softwareRenderer->dispcnt)) {
565 _breakWindow(softwareRenderer, &softwareRenderer->winN[1], y);
566 }
567 if (GBARegisterDISPCNTIsWin0Enable(softwareRenderer->dispcnt)) {
568 _breakWindow(softwareRenderer, &softwareRenderer->winN[0], y);
569 }
570 } else {
571 softwareRenderer->windows[0].control.packed = 0xFF;
572 }
573
574 GBAVideoSoftwareRendererUpdateDISPCNT(softwareRenderer);
575 if (softwareRenderer->blendDirty) {
576 _updatePalettes(softwareRenderer);
577 softwareRenderer->blendDirty = false;
578 }
579
580 int w;
581 x = 0;
582 for (w = 0; w < softwareRenderer->nWindows; ++w) {
583 // TOOD: handle objwin on backdrop
584 uint32_t backdrop = FLAG_UNWRITTEN | FLAG_PRIORITY | FLAG_IS_BACKGROUND;
585 if (!softwareRenderer->target1Bd || softwareRenderer->blendEffect == BLEND_NONE || softwareRenderer->blendEffect == BLEND_ALPHA || !GBAWindowControlIsBlendEnable(softwareRenderer->windows[w].control.packed)) {
586 backdrop |= softwareRenderer->normalPalette[0];
587 } else {
588 backdrop |= softwareRenderer->variantPalette[0];
589 }
590 int end = softwareRenderer->windows[w].endX;
591 for (; x < end - 3; x += 4) {
592 softwareRenderer->row[x] = backdrop;
593 softwareRenderer->row[x + 1] = backdrop;
594 softwareRenderer->row[x + 2] = backdrop;
595 softwareRenderer->row[x + 3] = backdrop;
596 }
597 for (; x < end; ++x) {
598 softwareRenderer->row[x] = backdrop;
599 }
600 }
601
602 _drawScanline(softwareRenderer, y);
603
604 if (softwareRenderer->target2Bd) {
605 x = 0;
606 for (w = 0; w < softwareRenderer->nWindows; ++w) {
607 uint32_t backdrop = 0;
608 if (!softwareRenderer->target1Bd || softwareRenderer->blendEffect == BLEND_NONE || softwareRenderer->blendEffect == BLEND_ALPHA || !GBAWindowControlIsBlendEnable(softwareRenderer->windows[w].control.packed)) {
609 backdrop |= softwareRenderer->normalPalette[0];
610 } else {
611 backdrop |= softwareRenderer->variantPalette[0];
612 }
613 int end = softwareRenderer->windows[w].endX;
614 for (; x < end; ++x) {
615 uint32_t color = softwareRenderer->row[x];
616 if (color & FLAG_TARGET_1) {
617 softwareRenderer->row[x] = _mix(softwareRenderer->bldb, backdrop, softwareRenderer->blda, color);
618 }
619 }
620 }
621 }
622 if (softwareRenderer->target1Obj && (softwareRenderer->blendEffect == BLEND_DARKEN || softwareRenderer->blendEffect == BLEND_BRIGHTEN)) {
623 x = 0;
624 uint32_t mask = 0xFF000000 & ~FLAG_OBJWIN;
625 uint32_t match = FLAG_REBLEND;
626 if (GBARegisterDISPCNTIsObjwinEnable(softwareRenderer->dispcnt)) {
627 mask |= FLAG_OBJWIN;
628 if (GBAWindowControlIsBlendEnable(softwareRenderer->objwin.packed)) {
629 match |= FLAG_OBJWIN;
630 }
631 }
632 for (w = 0; w < softwareRenderer->nWindows; ++w) {
633 if (!GBAWindowControlIsBlendEnable(softwareRenderer->windows[w].control.packed)) {
634 continue;
635 }
636 int end = softwareRenderer->windows[w].endX;
637 if (softwareRenderer->blendEffect == BLEND_DARKEN) {
638 for (; x < end; ++x) {
639 uint32_t color = softwareRenderer->row[x];
640 if ((color & mask) == match) {
641 softwareRenderer->row[x] = _darken(color, softwareRenderer->bldy);
642 }
643 }
644 } else if (softwareRenderer->blendEffect == BLEND_BRIGHTEN) {
645 for (; x < end; ++x) {
646 uint32_t color = softwareRenderer->row[x];
647 if ((color & mask) == match) {
648 softwareRenderer->row[x] = _brighten(color, softwareRenderer->bldy);
649 }
650 }
651 }
652 }
653 }
654
655#ifdef COLOR_16_BIT
656 for (x = 0; x < VIDEO_HORIZONTAL_PIXELS; x += 4) {
657 row[x] = softwareRenderer->row[x];
658 row[x + 1] = softwareRenderer->row[x + 1];
659 row[x + 2] = softwareRenderer->row[x + 2];
660 row[x + 3] = softwareRenderer->row[x + 3];
661 }
662#else
663 memcpy(row, softwareRenderer->row, VIDEO_HORIZONTAL_PIXELS * sizeof(*row));
664#endif
665 CLEAN_SCANLINE(softwareRenderer, y);
666}
667
668static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer) {
669 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
670
671 softwareRenderer->nextY = 0;
672 if (softwareRenderer->temporaryBuffer) {
673 mappedMemoryFree(softwareRenderer->temporaryBuffer, VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * 4);
674 softwareRenderer->temporaryBuffer = 0;
675 }
676 softwareRenderer->bg[2].sx = softwareRenderer->bg[2].refx;
677 softwareRenderer->bg[2].sy = softwareRenderer->bg[2].refy;
678 softwareRenderer->bg[3].sx = softwareRenderer->bg[3].refx;
679 softwareRenderer->bg[3].sy = softwareRenderer->bg[3].refy;
680}
681
682static void GBAVideoSoftwareRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels) {
683 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
684 *stride = softwareRenderer->outputBufferStride;
685 *pixels = softwareRenderer->outputBuffer;
686}
687
688static void GBAVideoSoftwareRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels) {
689 struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
690
691 const color_t* colorPixels = pixels;
692 unsigned i;
693 for (i = 0; i < VIDEO_VERTICAL_PIXELS; ++i) {
694 memmove(&softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * i], &colorPixels[stride * i], VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL);
695 }
696}
697
698static void GBAVideoSoftwareRendererUpdateDISPCNT(struct GBAVideoSoftwareRenderer* renderer) {
699 renderer->bg[0].enabled = GBARegisterDISPCNTGetBg0Enable(renderer->dispcnt) && !renderer->d.disableBG[0];
700 renderer->bg[1].enabled = GBARegisterDISPCNTGetBg1Enable(renderer->dispcnt) && !renderer->d.disableBG[1];
701 renderer->bg[2].enabled = GBARegisterDISPCNTGetBg2Enable(renderer->dispcnt) && !renderer->d.disableBG[2];
702 renderer->bg[3].enabled = GBARegisterDISPCNTGetBg3Enable(renderer->dispcnt) && !renderer->d.disableBG[3];
703}
704
705static void GBAVideoSoftwareRendererWriteBGCNT(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* bg, uint16_t value) {
706 UNUSED(renderer);
707 bg->priority = GBARegisterBGCNTGetPriority(value);
708 bg->charBase = GBARegisterBGCNTGetCharBase(value) << 14;
709 bg->mosaic = GBARegisterBGCNTGetMosaic(value);
710 bg->multipalette = GBARegisterBGCNTGet256Color(value);
711 bg->screenBase = GBARegisterBGCNTGetScreenBase(value) << 11;
712 bg->overflow = GBARegisterBGCNTGetOverflow(value);
713 bg->size = GBARegisterBGCNTGetSize(value);
714}
715
716static void GBAVideoSoftwareRendererWriteBGX_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
717 bg->refx = (bg->refx & 0xFFFF0000) | value;
718 bg->sx = bg->refx;
719}
720
721static void GBAVideoSoftwareRendererWriteBGX_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
722 bg->refx = (bg->refx & 0x0000FFFF) | (value << 16);
723 bg->refx <<= 4;
724 bg->refx >>= 4;
725 bg->sx = bg->refx;
726}
727
728static void GBAVideoSoftwareRendererWriteBGY_LO(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
729 bg->refy = (bg->refy & 0xFFFF0000) | value;
730 bg->sy = bg->refy;
731}
732
733static void GBAVideoSoftwareRendererWriteBGY_HI(struct GBAVideoSoftwareBackground* bg, uint16_t value) {
734 bg->refy = (bg->refy & 0x0000FFFF) | (value << 16);
735 bg->refy <<= 4;
736 bg->refy >>= 4;
737 bg->sy = bg->refy;
738}
739
740static void GBAVideoSoftwareRendererWriteBLDCNT(struct GBAVideoSoftwareRenderer* renderer, uint16_t value) {
741 enum BlendEffect oldEffect = renderer->blendEffect;
742
743 renderer->bg[0].target1 = GBARegisterBLDCNTGetTarget1Bg0(value);
744 renderer->bg[1].target1 = GBARegisterBLDCNTGetTarget1Bg1(value);
745 renderer->bg[2].target1 = GBARegisterBLDCNTGetTarget1Bg2(value);
746 renderer->bg[3].target1 = GBARegisterBLDCNTGetTarget1Bg3(value);
747 renderer->bg[0].target2 = GBARegisterBLDCNTGetTarget2Bg0(value);
748 renderer->bg[1].target2 = GBARegisterBLDCNTGetTarget2Bg1(value);
749 renderer->bg[2].target2 = GBARegisterBLDCNTGetTarget2Bg2(value);
750 renderer->bg[3].target2 = GBARegisterBLDCNTGetTarget2Bg3(value);
751
752 renderer->blendEffect = GBARegisterBLDCNTGetEffect(value);
753 renderer->target1Obj = GBARegisterBLDCNTGetTarget1Obj(value);
754 renderer->target1Bd = GBARegisterBLDCNTGetTarget1Bd(value);
755 renderer->target2Obj = GBARegisterBLDCNTGetTarget2Obj(value);
756 renderer->target2Bd = GBARegisterBLDCNTGetTarget2Bd(value);
757
758 if (oldEffect != renderer->blendEffect) {
759 renderer->blendDirty = true;
760 }
761}
762
763#define TEST_LAYER_ENABLED(X) \
764 (renderer->bg[X].enabled && \
765 (GBAWindowControlIsBg ## X ## Enable(renderer->currentWindow.packed) || \
766 (GBARegisterDISPCNTIsObjwinEnable(renderer->dispcnt) && GBAWindowControlIsBg ## X ## Enable (renderer->objwin.packed))) && \
767 renderer->bg[X].priority == priority)
768
769static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y) {
770 int w;
771 renderer->end = 0;
772 int spriteLayers = 0;
773 if (GBARegisterDISPCNTIsObjEnable(renderer->dispcnt) && !renderer->d.disableOBJ) {
774 if (renderer->oamDirty) {
775 _cleanOAM(renderer);
776 }
777 renderer->spriteCyclesRemaining = GBARegisterDISPCNTIsHblankIntervalFree(renderer->dispcnt) ? OBJ_HBLANK_FREE_LENGTH : OBJ_LENGTH;
778 int mosaicV = GBAMosaicControlGetObjV(renderer->mosaic) + 1;
779 int mosaicY = y - (y % mosaicV);
780 for (w = 0; w < renderer->nWindows; ++w) {
781 renderer->start = renderer->end;
782 renderer->end = renderer->windows[w].endX;
783 renderer->currentWindow = renderer->windows[w].control;
784 if (!GBAWindowControlIsObjEnable(renderer->currentWindow.packed) && !GBARegisterDISPCNTIsObjwinEnable(renderer->dispcnt)) {
785 continue;
786 }
787 int i;
788 int drawn;
789
790 for (i = 0; i < renderer->oamMax; ++i) {
791 int localY = y;
792 if (renderer->spriteCyclesRemaining <= 0) {
793 break;
794 }
795 struct GBAVideoSoftwareSprite* sprite = &renderer->sprites[i];
796 if (GBAObjAttributesAIsMosaic(sprite->obj.a)) {
797 localY = mosaicY;
798 }
799 if ((localY < sprite->y && (sprite->endY - 256 < 0 || localY >= sprite->endY - 256)) || localY >= sprite->endY) {
800 continue;
801 }
802 drawn = GBAVideoSoftwareRendererPreprocessSprite(renderer, &sprite->obj, localY);
803 spriteLayers |= drawn << GBAObjAttributesCGetPriority(sprite->obj.c);
804 }
805 }
806 }
807
808 unsigned priority;
809 for (priority = 0; priority < 4; ++priority) {
810 renderer->end = 0;
811 for (w = 0; w < renderer->nWindows; ++w) {
812 renderer->start = renderer->end;
813 renderer->end = renderer->windows[w].endX;
814 renderer->currentWindow = renderer->windows[w].control;
815 if (spriteLayers & (1 << priority)) {
816 GBAVideoSoftwareRendererPostprocessSprite(renderer, priority);
817 }
818 if (TEST_LAYER_ENABLED(0) && GBARegisterDISPCNTGetMode(renderer->dispcnt) < 2) {
819 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[0], y);
820 }
821 if (TEST_LAYER_ENABLED(1) && GBARegisterDISPCNTGetMode(renderer->dispcnt) < 2) {
822 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[1], y);
823 }
824 if (TEST_LAYER_ENABLED(2)) {
825 switch (GBARegisterDISPCNTGetMode(renderer->dispcnt)) {
826 case 0:
827 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[2], y);
828 break;
829 case 1:
830 case 2:
831 GBAVideoSoftwareRendererDrawBackgroundMode2(renderer, &renderer->bg[2], y);
832 break;
833 case 3:
834 GBAVideoSoftwareRendererDrawBackgroundMode3(renderer, &renderer->bg[2], y);
835 break;
836 case 4:
837 GBAVideoSoftwareRendererDrawBackgroundMode4(renderer, &renderer->bg[2], y);
838 break;
839 case 5:
840 GBAVideoSoftwareRendererDrawBackgroundMode5(renderer, &renderer->bg[2], y);
841 break;
842 }
843 }
844 if (TEST_LAYER_ENABLED(3)) {
845 switch (GBARegisterDISPCNTGetMode(renderer->dispcnt)) {
846 case 0:
847 GBAVideoSoftwareRendererDrawBackgroundMode0(renderer, &renderer->bg[3], y);
848 break;
849 case 2:
850 GBAVideoSoftwareRendererDrawBackgroundMode2(renderer, &renderer->bg[3], y);
851 break;
852 }
853 }
854 }
855 }
856 if (GBARegisterDISPCNTGetMode(renderer->dispcnt) != 0) {
857 renderer->bg[2].sx += renderer->bg[2].dmx;
858 renderer->bg[2].sy += renderer->bg[2].dmy;
859 renderer->bg[3].sx += renderer->bg[3].dmx;
860 renderer->bg[3].sy += renderer->bg[3].dmy;
861 }
862}
863
864static void _updatePalettes(struct GBAVideoSoftwareRenderer* renderer) {
865 int i;
866 if (renderer->blendEffect == BLEND_BRIGHTEN) {
867 for (i = 0; i < 512; ++i) {
868 renderer->variantPalette[i] = _brighten(renderer->normalPalette[i], renderer->bldy);
869 }
870 } else if (renderer->blendEffect == BLEND_DARKEN) {
871 for (i = 0; i < 512; ++i) {
872 renderer->variantPalette[i] = _darken(renderer->normalPalette[i], renderer->bldy);
873 }
874 } else {
875 for (i = 0; i < 512; ++i) {
876 renderer->variantPalette[i] = renderer->normalPalette[i];
877 }
878 }
879}