1/* Copyright (c) 2013-2016 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 <mgba/internal/gb/renderers/software.h>
   7
   8#include <mgba/core/cache-set.h>
   9#include <mgba/internal/gb/io.h>
  10#include <mgba/internal/gb/renderers/cache-set.h>
  11#include <mgba-util/math.h>
  12#include <mgba-util/memory.h>
  13
  14#define PAL_BG 0
  15#define PAL_OBJ 0x20
  16#define PAL_HIGHLIGHT 0x80
  17#define PAL_HIGHLIGHT_BG (PAL_HIGHLIGHT | PAL_BG)
  18#define PAL_HIGHLIGHT_OBJ (PAL_HIGHLIGHT | PAL_OBJ)
  19#define PAL_SGB_BORDER 0x40
  20#define OBJ_PRIORITY 0x100
  21#define OBJ_PRIO_MASK 0x0FF
  22
  23static void GBVideoSoftwareRendererInit(struct GBVideoRenderer* renderer, enum GBModel model, bool borders);
  24static void GBVideoSoftwareRendererDeinit(struct GBVideoRenderer* renderer);
  25static uint8_t GBVideoSoftwareRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value);
  26static void GBVideoSoftwareRendererWriteSGBPacket(struct GBVideoRenderer* renderer, uint8_t* data);
  27static void GBVideoSoftwareRendererWritePalette(struct GBVideoRenderer* renderer, int index, uint16_t value);
  28static void GBVideoSoftwareRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address);
  29static void GBVideoSoftwareRendererWriteOAM(struct GBVideoRenderer* renderer, uint16_t oam);
  30static void GBVideoSoftwareRendererDrawRange(struct GBVideoRenderer* renderer, int startX, int endX, int y);
  31static void GBVideoSoftwareRendererFinishScanline(struct GBVideoRenderer* renderer, int y);
  32static void GBVideoSoftwareRendererFinishFrame(struct GBVideoRenderer* renderer);
  33static void GBVideoSoftwareRendererEnableSGBBorder(struct GBVideoRenderer* renderer, bool enable);
  34static void GBVideoSoftwareRendererGetPixels(struct GBVideoRenderer* renderer, size_t* stride, const void** pixels);
  35static void GBVideoSoftwareRendererPutPixels(struct GBVideoRenderer* renderer, size_t stride, const void* pixels);
  36
  37static void GBVideoSoftwareRendererDrawBackground(struct GBVideoSoftwareRenderer* renderer, uint8_t* maps, int startX, int endX, int sx, int sy, bool highlight);
  38static void GBVideoSoftwareRendererDrawObj(struct GBVideoSoftwareRenderer* renderer, struct GBVideoRendererSprite* obj, int startX, int endX, int y);
  39
  40static void _clearScreen(struct GBVideoSoftwareRenderer* renderer) {
  41	size_t sgbOffset = 0;
  42	if (renderer->model & GB_MODEL_SGB) {
  43		return;
  44	}
  45	int y;
  46	for (y = 0; y < GB_VIDEO_VERTICAL_PIXELS; ++y) {
  47		color_t* row = &renderer->outputBuffer[renderer->outputBufferStride * y + sgbOffset];
  48		int x;
  49		for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; x += 4) {
  50			row[x + 0] = renderer->palette[0];
  51			row[x + 1] = renderer->palette[0];
  52			row[x + 2] = renderer->palette[0];
  53			row[x + 3] = renderer->palette[0];
  54		}
  55	}
  56}
  57
  58static void _regenerateSGBBorder(struct GBVideoSoftwareRenderer* renderer) {
  59	int i;
  60	for (i = 0; i < 0x40; ++i) {
  61		uint16_t color;
  62		LOAD_16LE(color, 0x800 + i * 2, renderer->d.sgbMapRam);
  63		renderer->d.writePalette(&renderer->d, i + PAL_SGB_BORDER, color);
  64	}
  65	int x, y;
  66	for (y = 0; y < 224; ++y) {
  67		for (x = 0; x < 256; x += 8) {
  68			if (x >= 48 && x < 208 && y >= 40 && y < 184) {
  69				continue;
  70			}
  71			uint16_t mapData;
  72			LOAD_16LE(mapData, (x >> 2) + (y & ~7) * 8, renderer->d.sgbMapRam);
  73			if (UNLIKELY(SGBBgAttributesGetTile(mapData) >= 0x100)) {
  74				continue;
  75			}
  76
  77			int localY = y & 0x7;
  78			if (SGBBgAttributesIsYFlip(mapData)) {
  79				localY = 7 - localY;
  80			}
  81			uint8_t tileData[4];
  82			tileData[0] = renderer->d.sgbCharRam[(SGBBgAttributesGetTile(mapData) * 16 + localY) * 2 + 0x00];
  83			tileData[1] = renderer->d.sgbCharRam[(SGBBgAttributesGetTile(mapData) * 16 + localY) * 2 + 0x01];
  84			tileData[2] = renderer->d.sgbCharRam[(SGBBgAttributesGetTile(mapData) * 16 + localY) * 2 + 0x10];
  85			tileData[3] = renderer->d.sgbCharRam[(SGBBgAttributesGetTile(mapData) * 16 + localY) * 2 + 0x11];
  86
  87			size_t base = y * renderer->outputBufferStride + x;
  88			int paletteBase = SGBBgAttributesGetPalette(mapData) * 0x10;
  89			int colorSelector;
  90
  91			int flip = 0;
  92			if (SGBBgAttributesIsXFlip(mapData)) {
  93				flip = 7;
  94			}
  95			for (i = 7; i >= 0; --i) {
  96				colorSelector = (tileData[0] >> i & 0x1) << 0 | (tileData[1] >> i & 0x1) << 1 | (tileData[2] >> i & 0x1) << 2 | (tileData[3] >> i & 0x1) << 3;
  97				renderer->outputBuffer[(base + 7 - i) ^ flip] = renderer->palette[paletteBase | colorSelector];
  98			}
  99		}
 100	}
 101}
 102
 103static inline void _setAttribute(uint8_t* sgbAttributes, unsigned x, unsigned y, int palette) {
 104	int p = sgbAttributes[(x >> 2) + 5 * y];
 105	p &= ~(3 << (2 * (3 - (x & 3))));
 106	p |= palette << (2 * (3 - (x & 3)));
 107	sgbAttributes[(x >> 2) + 5 * y] = p;
 108}
 109
 110static void _parseAttrBlock(struct GBVideoSoftwareRenderer* renderer, int start) {
 111	uint8_t block[6];
 112	memcpy(block, &renderer->sgbPacket[start], 6);
 113	unsigned x0 = block[2];
 114	unsigned x1 = block[4];
 115	unsigned y0 = block[3];
 116	unsigned y1 = block[5];
 117	unsigned x, y;
 118	int pIn = block[1] & 3;
 119	int pPerim = (block[1] >> 2) & 3;
 120	int pOut = (block[1] >> 4) & 3;
 121
 122	for (y = 0; y < GB_VIDEO_VERTICAL_PIXELS / 8; ++y) {
 123		for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++x) {
 124			if (y > y0 && y < y1 && x > x0 && x < x1) {
 125				if (block[0] & 1) {
 126					_setAttribute(renderer->d.sgbAttributes, x, y, pIn);
 127				}
 128			} else if (y < y0 || y > y1 || x < x0 || x > x1) {
 129				if (block[0] & 4) {
 130					_setAttribute(renderer->d.sgbAttributes, x, y, pOut);
 131				}
 132			} else {
 133				if (block[0] & 2) {
 134					_setAttribute(renderer->d.sgbAttributes, x, y, pPerim);
 135				} else if (block[0] & 1) {
 136					_setAttribute(renderer->d.sgbAttributes, x, y, pIn);
 137				} else if (block[0] & 4) {
 138					_setAttribute(renderer->d.sgbAttributes, x, y, pOut);
 139				}
 140			}
 141		}
 142	}
 143}
 144
 145static void _parseAttrLine(struct GBVideoSoftwareRenderer* renderer, int start) {
 146	uint8_t byte = renderer->sgbPacket[start];
 147	unsigned line = byte & 0x1F;
 148	int pal = (byte >> 5) & 3;
 149
 150	if (byte & 0x80) {
 151		if (line > GB_VIDEO_VERTICAL_PIXELS / 8) {
 152			return;
 153		}
 154		int x;
 155		for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++x) {
 156			_setAttribute(renderer->d.sgbAttributes, x, line, pal);
 157		}
 158	} else {
 159		if (line > GB_VIDEO_HORIZONTAL_PIXELS / 8) {
 160			return;
 161		}
 162		int y;
 163		for (y = 0; y < GB_VIDEO_VERTICAL_PIXELS / 8; ++y) {
 164			_setAttribute(renderer->d.sgbAttributes, line, y, pal);
 165		}
 166	}
 167}
 168
 169static bool _inWindow(struct GBVideoSoftwareRenderer* renderer) {
 170	return GBRegisterLCDCIsWindow(renderer->lcdc) && GB_VIDEO_HORIZONTAL_PIXELS + 7 > renderer->wx;
 171}
 172
 173void GBVideoSoftwareRendererCreate(struct GBVideoSoftwareRenderer* renderer) {
 174	renderer->d.init = GBVideoSoftwareRendererInit;
 175	renderer->d.deinit = GBVideoSoftwareRendererDeinit;
 176	renderer->d.writeVideoRegister = GBVideoSoftwareRendererWriteVideoRegister;
 177	renderer->d.writeSGBPacket = GBVideoSoftwareRendererWriteSGBPacket;
 178	renderer->d.writePalette = GBVideoSoftwareRendererWritePalette;
 179	renderer->d.writeVRAM = GBVideoSoftwareRendererWriteVRAM;
 180	renderer->d.writeOAM = GBVideoSoftwareRendererWriteOAM;
 181	renderer->d.drawRange = GBVideoSoftwareRendererDrawRange;
 182	renderer->d.finishScanline = GBVideoSoftwareRendererFinishScanline;
 183	renderer->d.finishFrame = GBVideoSoftwareRendererFinishFrame;
 184	renderer->d.enableSGBBorder = GBVideoSoftwareRendererEnableSGBBorder;
 185	renderer->d.getPixels = GBVideoSoftwareRendererGetPixels;
 186	renderer->d.putPixels = GBVideoSoftwareRendererPutPixels;
 187
 188	renderer->d.disableBG = false;
 189	renderer->d.disableOBJ = false;
 190	renderer->d.disableWIN = false;
 191
 192	renderer->d.highlightBG = false;
 193	renderer->d.highlightWIN = false;
 194	int i;
 195	for (i = 0; i < GB_VIDEO_MAX_OBJ; ++i) {
 196		renderer->d.highlightOBJ[i] = false;
 197	}
 198	renderer->d.highlightColor = M_COLOR_WHITE;
 199	renderer->d.highlightAmount = 0;
 200
 201	renderer->temporaryBuffer = 0;
 202}
 203
 204static void GBVideoSoftwareRendererInit(struct GBVideoRenderer* renderer, enum GBModel model, bool sgbBorders) {
 205	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 206	softwareRenderer->lcdc = 0;
 207	softwareRenderer->scy = 0;
 208	softwareRenderer->scx = 0;
 209	softwareRenderer->wy = 0;
 210	softwareRenderer->currentWy = 0;
 211	softwareRenderer->currentWx = 0;
 212	softwareRenderer->lastY = GB_VIDEO_VERTICAL_PIXELS;
 213	softwareRenderer->lastX = 0;
 214	softwareRenderer->hasWindow = false;
 215	softwareRenderer->wx = 0;
 216	softwareRenderer->model = model;
 217	softwareRenderer->sgbTransfer = 0;
 218	softwareRenderer->sgbCommandHeader = 0;
 219	softwareRenderer->sgbBorders = sgbBorders;
 220	softwareRenderer->objOffsetX = 0;
 221	softwareRenderer->objOffsetY = 0;
 222	softwareRenderer->offsetScx = 0;
 223	softwareRenderer->offsetScy = 0;
 224	softwareRenderer->offsetWx = 0;
 225	softwareRenderer->offsetWy = 0;
 226
 227	size_t i;
 228	for (i = 0; i < (sizeof(softwareRenderer->lookup) / sizeof(*softwareRenderer->lookup)); ++i) {
 229		softwareRenderer->lookup[i] = i;
 230		softwareRenderer->lookup[i] = i;
 231		softwareRenderer->lookup[i] = i;
 232		softwareRenderer->lookup[i] = i;
 233	}
 234
 235	memset(softwareRenderer->palette, 0, sizeof(softwareRenderer->palette));
 236
 237	softwareRenderer->lastHighlightAmount = 0;
 238}
 239
 240static void GBVideoSoftwareRendererDeinit(struct GBVideoRenderer* renderer) {
 241	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 242	UNUSED(softwareRenderer);
 243}
 244
 245static void GBVideoSoftwareRendererUpdateWindow(struct GBVideoSoftwareRenderer* renderer, bool before, bool after, uint8_t oldWy) {
 246	if (renderer->lastY >= GB_VIDEO_VERTICAL_PIXELS || !(after || before)) {
 247		return;
 248	}
 249	if (!renderer->hasWindow && renderer->lastX == GB_VIDEO_HORIZONTAL_PIXELS) {
 250		return;
 251	}
 252	if (renderer->lastY >= oldWy) {
 253		if (!after) {
 254			renderer->currentWy -= renderer->lastY;
 255			renderer->hasWindow = true;
 256		} else if (!before) {
 257			if (!renderer->hasWindow) {
 258				renderer->currentWy = renderer->lastY - renderer->wy;
 259				if (renderer->lastY >= renderer->wy && renderer->lastX > renderer->wx) {
 260					++renderer->currentWy;
 261				}
 262			} else {
 263				renderer->currentWy += renderer->lastY;
 264			}
 265		} else if (renderer->wy != oldWy) {
 266			renderer->currentWy += oldWy - renderer->wy;
 267			renderer->hasWindow = true;
 268		}
 269	}
 270}
 271
 272static uint8_t GBVideoSoftwareRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value) {
 273	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 274	if (renderer->cache) {
 275		GBVideoCacheWriteVideoRegister(renderer->cache, address, value);
 276	}
 277	bool wasWindow = _inWindow(softwareRenderer);
 278	uint8_t wy = softwareRenderer->wy;
 279	switch (address) {
 280	case GB_REG_LCDC:
 281		softwareRenderer->lcdc = value;
 282		GBVideoSoftwareRendererUpdateWindow(softwareRenderer, wasWindow, _inWindow(softwareRenderer), wy);
 283		break;
 284	case GB_REG_SCY:
 285		softwareRenderer->scy = value;
 286		break;
 287	case GB_REG_SCX:
 288		softwareRenderer->scx = value;
 289		break;
 290	case GB_REG_WY:
 291		softwareRenderer->wy = value;
 292		GBVideoSoftwareRendererUpdateWindow(softwareRenderer, wasWindow, _inWindow(softwareRenderer), wy);
 293		break;
 294	case GB_REG_WX:
 295		softwareRenderer->wx = value;
 296		GBVideoSoftwareRendererUpdateWindow(softwareRenderer, wasWindow, _inWindow(softwareRenderer), wy);
 297		break;
 298	case GB_REG_BGP:
 299		softwareRenderer->lookup[0] = value & 3;
 300		softwareRenderer->lookup[1] = (value >> 2) & 3;
 301		softwareRenderer->lookup[2] = (value >> 4) & 3;
 302		softwareRenderer->lookup[3] = (value >> 6) & 3;
 303		softwareRenderer->lookup[PAL_HIGHLIGHT_BG + 0] = PAL_HIGHLIGHT + (value & 3);
 304		softwareRenderer->lookup[PAL_HIGHLIGHT_BG + 1] = PAL_HIGHLIGHT + ((value >> 2) & 3);
 305		softwareRenderer->lookup[PAL_HIGHLIGHT_BG + 2] = PAL_HIGHLIGHT + ((value >> 4) & 3);
 306		softwareRenderer->lookup[PAL_HIGHLIGHT_BG + 3] = PAL_HIGHLIGHT + ((value >> 6) & 3);
 307		break;
 308	case GB_REG_OBP0:
 309		softwareRenderer->lookup[PAL_OBJ + 0] = value & 3;
 310		softwareRenderer->lookup[PAL_OBJ + 1] = (value >> 2) & 3;
 311		softwareRenderer->lookup[PAL_OBJ + 2] = (value >> 4) & 3;
 312		softwareRenderer->lookup[PAL_OBJ + 3] = (value >> 6) & 3;
 313		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 0] = PAL_HIGHLIGHT + (value & 3);
 314		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 1] = PAL_HIGHLIGHT + ((value >> 2) & 3);
 315		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 2] = PAL_HIGHLIGHT + ((value >> 4) & 3);
 316		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 3] = PAL_HIGHLIGHT + ((value >> 6) & 3);
 317		break;
 318	case GB_REG_OBP1:
 319		softwareRenderer->lookup[PAL_OBJ + 4] = value & 3;
 320		softwareRenderer->lookup[PAL_OBJ + 5] = (value >> 2) & 3;
 321		softwareRenderer->lookup[PAL_OBJ + 6] = (value >> 4) & 3;
 322		softwareRenderer->lookup[PAL_OBJ + 7] = (value >> 6) & 3;
 323		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 4] = PAL_HIGHLIGHT + (value & 3);
 324		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 5] = PAL_HIGHLIGHT + ((value >> 2) & 3);
 325		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 6] = PAL_HIGHLIGHT + ((value >> 4) & 3);
 326		softwareRenderer->lookup[PAL_HIGHLIGHT_OBJ + 7] = PAL_HIGHLIGHT + ((value >> 6) & 3);
 327		break;
 328	}
 329	return value;
 330}
 331
 332static void GBVideoSoftwareRendererWriteSGBPacket(struct GBVideoRenderer* renderer, uint8_t* data) {
 333	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 334	memcpy(softwareRenderer->sgbPacket, data, sizeof(softwareRenderer->sgbPacket));
 335	int i;
 336	softwareRenderer->sgbCommandHeader = data[0];
 337	softwareRenderer->sgbTransfer = 0;
 338	int set;
 339	int sets;
 340	int attrX;
 341	int attrY;
 342	int attrDirection;
 343	int pBefore;
 344	int pAfter;
 345	int pDiv;
 346	switch (softwareRenderer->sgbCommandHeader >> 3) {
 347	case SGB_PAL_SET:
 348		softwareRenderer->sgbPacket[1] = data[9];
 349		if (!(data[9] & 0x80)) {
 350			break;
 351		}
 352		// Fall through
 353	case SGB_ATTR_SET:
 354		set = softwareRenderer->sgbPacket[1] & 0x3F;
 355		if (set <= 0x2C) {
 356			memcpy(renderer->sgbAttributes, &renderer->sgbAttributeFiles[set * 90], 90);
 357		}
 358		break;
 359	case SGB_ATTR_BLK:
 360		sets = softwareRenderer->sgbPacket[1];
 361		i = 2;
 362		for (; i < (softwareRenderer->sgbCommandHeader & 7) << 4 && sets; i += 6, --sets) {
 363			_parseAttrBlock(softwareRenderer, i);
 364		}
 365		break;
 366	case SGB_ATTR_LIN:
 367		sets = softwareRenderer->sgbPacket[1];
 368		i = 2;
 369		for (; i < (softwareRenderer->sgbCommandHeader & 7) << 4 && sets; ++i, --sets) {
 370			_parseAttrLine(softwareRenderer, i);
 371		}
 372		break;
 373	case SGB_ATTR_DIV:
 374		pAfter = softwareRenderer->sgbPacket[1] & 3;
 375		pBefore = (softwareRenderer->sgbPacket[1] >> 2) & 3;
 376		pDiv = (softwareRenderer->sgbPacket[1] >> 4) & 3;
 377		attrX = softwareRenderer->sgbPacket[2];
 378		if (softwareRenderer->sgbPacket[1] & 0x40) {
 379			if (attrX > GB_VIDEO_VERTICAL_PIXELS / 8) {
 380				attrX = GB_VIDEO_VERTICAL_PIXELS / 8;
 381			}
 382			int j;
 383			for (j = 0; j < attrX; ++j) {
 384				for (i = 0; i < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++i) {
 385					_setAttribute(renderer->sgbAttributes, i, j, pBefore);
 386				}
 387			}
 388			if (attrX < GB_VIDEO_VERTICAL_PIXELS / 8) {
 389				for (i = 0; i < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++i) {
 390					_setAttribute(renderer->sgbAttributes, i, attrX, pDiv);
 391				}
 392
 393			}
 394			for (; j < GB_VIDEO_VERTICAL_PIXELS / 8; ++j) {
 395				for (i = 0; i < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++i) {
 396					_setAttribute(renderer->sgbAttributes, i, j, pAfter);
 397				}
 398			}
 399		} else {
 400			if (attrX > GB_VIDEO_HORIZONTAL_PIXELS / 8) {
 401				attrX = GB_VIDEO_HORIZONTAL_PIXELS / 8;
 402			}
 403			int j;
 404			for (j = 0; j < attrX; ++j) {
 405				for (i = 0; i < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++i) {
 406					_setAttribute(renderer->sgbAttributes, j, i, pBefore);
 407				}
 408			}
 409			if (attrX < GB_VIDEO_HORIZONTAL_PIXELS / 8) {
 410				for (i = 0; i < GB_VIDEO_VERTICAL_PIXELS / 8; ++i) {
 411					_setAttribute(renderer->sgbAttributes, attrX, i, pDiv);
 412				}
 413
 414			}
 415			for (; j < GB_VIDEO_HORIZONTAL_PIXELS / 8; ++j) {
 416				for (i = 0; i < GB_VIDEO_VERTICAL_PIXELS / 8; ++i) {
 417					_setAttribute(renderer->sgbAttributes, j, i, pAfter);
 418				}
 419			}
 420		}
 421		break;
 422	case SGB_ATTR_CHR:
 423		attrX = softwareRenderer->sgbPacket[1];
 424		attrY = softwareRenderer->sgbPacket[2];
 425		if (attrX >= GB_VIDEO_HORIZONTAL_PIXELS / 8) {
 426			attrX = 0;
 427		}
 428		if (attrY >= GB_VIDEO_VERTICAL_PIXELS / 8) {
 429			attrY = 0;
 430		}
 431		sets = softwareRenderer->sgbPacket[3];
 432		sets |= softwareRenderer->sgbPacket[4] << 8;
 433		attrDirection = softwareRenderer->sgbPacket[5];
 434		i = 6;
 435		for (; i < (softwareRenderer->sgbCommandHeader & 7) << 4 && sets; ++i) {
 436			int j;
 437			for (j = 0; j < 4 && sets; ++j, --sets) {
 438				uint8_t p = softwareRenderer->sgbPacket[i] >> (6 - j * 2);
 439				_setAttribute(renderer->sgbAttributes, attrX, attrY, p & 3);
 440				if (attrDirection) {
 441					++attrY;
 442					if (attrY >= GB_VIDEO_VERTICAL_PIXELS / 8) {
 443						attrY = 0;
 444						++attrX;
 445					}
 446					if (attrX >= GB_VIDEO_HORIZONTAL_PIXELS / 8) {
 447						attrX = 0;
 448					}
 449				} else {
 450					++attrX;
 451					if (attrX >= GB_VIDEO_HORIZONTAL_PIXELS / 8) {
 452						attrX = 0;
 453						++attrY;
 454					}
 455					if (attrY >= GB_VIDEO_VERTICAL_PIXELS / 8) {
 456						attrY = 0;
 457					}
 458				}
 459			}
 460		}
 461
 462		break;
 463	case SGB_ATRC_EN:
 464	case SGB_MASK_EN:
 465		if (softwareRenderer->sgbBorders && !renderer->sgbRenderMode) {
 466			_regenerateSGBBorder(softwareRenderer);
 467		}
 468	}
 469}
 470
 471static void GBVideoSoftwareRendererWritePalette(struct GBVideoRenderer* renderer, int index, uint16_t value) {
 472	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 473	color_t color = mColorFrom555(value);
 474	if (softwareRenderer->model & GB_MODEL_SGB) {
 475		if (index < 0x10 && index && !(index & 3)) {
 476			color = softwareRenderer->palette[0];
 477		} else if (index >= PAL_SGB_BORDER && !(index & 0xF)) {
 478			color = softwareRenderer->palette[0];
 479		} else if (index > PAL_HIGHLIGHT && index < PAL_HIGHLIGHT_OBJ && !(index & 3)) {
 480			color = softwareRenderer->palette[PAL_HIGHLIGHT_BG];			
 481		}
 482	}
 483	if (renderer->cache) {
 484		mCacheSetWritePalette(renderer->cache, index, color);
 485	}
 486	if (softwareRenderer->model == GB_MODEL_AGB) {
 487		unsigned r = M_R5(value);
 488		unsigned g = M_G5(value);
 489		unsigned b = M_B5(value);
 490		r = r * r;
 491		g = g * g;
 492		b = b * b;
 493#ifdef COLOR_16_BIT
 494		r /= 31;
 495		g /= 31;
 496		b /= 31;
 497		color = mColorFrom555(r | (g << 5) | (b << 10));
 498#else
 499		r >>= 2;
 500		r += r >> 4;
 501		g >>= 2;
 502		g += g >> 4;
 503		b >>= 2;
 504		b += b >> 4;
 505		color = r | (g << 8) | (b << 16);
 506#endif
 507	}
 508	softwareRenderer->palette[index] = color;
 509	if (index < PAL_SGB_BORDER && (index < PAL_OBJ || (index & 3))) {
 510		softwareRenderer->palette[index + PAL_HIGHLIGHT] = mColorMix5Bit(0x10 - softwareRenderer->lastHighlightAmount, color, softwareRenderer->lastHighlightAmount, renderer->highlightColor);
 511	}
 512
 513	if (softwareRenderer->model & GB_MODEL_SGB && !index && GBRegisterLCDCIsEnable(softwareRenderer->lcdc)) {
 514		renderer->writePalette(renderer, 0x04, value);
 515		renderer->writePalette(renderer, 0x08, value);
 516		renderer->writePalette(renderer, 0x0C, value);
 517		renderer->writePalette(renderer, 0x40, value);
 518		renderer->writePalette(renderer, 0x50, value);
 519		renderer->writePalette(renderer, 0x60, value);
 520		renderer->writePalette(renderer, 0x70, value);
 521		if (softwareRenderer->sgbBorders && !renderer->sgbRenderMode) {
 522			_regenerateSGBBorder(softwareRenderer);
 523		}
 524	}
 525}
 526
 527static void GBVideoSoftwareRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address) {
 528	if (renderer->cache) {
 529		mCacheSetWriteVRAM(renderer->cache, address);
 530	}
 531}
 532
 533static void GBVideoSoftwareRendererWriteOAM(struct GBVideoRenderer* renderer, uint16_t oam) {
 534	UNUSED(renderer);
 535	UNUSED(oam);
 536	// Nothing to do
 537}
 538
 539static void _cleanOAM(struct GBVideoSoftwareRenderer* renderer, int y) {
 540	// TODO: GBC differences
 541	// TODO: Optimize
 542	int spriteHeight = 8;
 543	if (GBRegisterLCDCIsObjSize(renderer->lcdc)) {
 544		spriteHeight = 16;
 545	}
 546	int o = 0;
 547	int i;
 548	for (i = 0; i < GB_VIDEO_MAX_OBJ && o < GB_VIDEO_MAX_LINE_OBJ; ++i) {
 549		uint8_t oy = renderer->d.oam->obj[i].y;
 550		if (y < oy - 16 || y >= oy - 16 + spriteHeight) {
 551			continue;
 552		}
 553		// TODO: Sort
 554		renderer->obj[o].obj = renderer->d.oam->obj[i];
 555		renderer->obj[o].index = i;
 556		++o;
 557		if (o == 10) {
 558			break;
 559		}
 560	}
 561	renderer->objMax = o;
 562}
 563
 564static void GBVideoSoftwareRendererDrawRange(struct GBVideoRenderer* renderer, int startX, int endX, int y) {
 565	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 566	softwareRenderer->lastY = y;
 567	softwareRenderer->lastX = endX;
 568	uint8_t* maps = &softwareRenderer->d.vram[GB_BASE_MAP];
 569	if (GBRegisterLCDCIsTileMap(softwareRenderer->lcdc)) {
 570		maps += GB_SIZE_MAP;
 571	}
 572	if (softwareRenderer->d.disableBG) {
 573		memset(&softwareRenderer->row[startX], 0, (endX - startX) * sizeof(softwareRenderer->row[0]));
 574	}
 575	if (GBRegisterLCDCIsBgEnable(softwareRenderer->lcdc) || softwareRenderer->model >= GB_MODEL_CGB) {
 576		int wy = softwareRenderer->wy + softwareRenderer->currentWy;
 577		int wx = softwareRenderer->wx + softwareRenderer->currentWx - 7;
 578		if (GBRegisterLCDCIsWindow(softwareRenderer->lcdc) && wy == y && wx <= endX) {
 579			softwareRenderer->hasWindow = true;
 580		}
 581		if (GBRegisterLCDCIsWindow(softwareRenderer->lcdc) && softwareRenderer->hasWindow && wx <= endX && !softwareRenderer->d.disableWIN) {
 582			if (wx > 0 && !softwareRenderer->d.disableBG) {
 583				GBVideoSoftwareRendererDrawBackground(softwareRenderer, maps, startX, wx, softwareRenderer->scx - softwareRenderer->offsetScx, softwareRenderer->scy + y - softwareRenderer->offsetScy, renderer->highlightBG);
 584			}
 585
 586			maps = &softwareRenderer->d.vram[GB_BASE_MAP];
 587			if (GBRegisterLCDCIsWindowTileMap(softwareRenderer->lcdc)) {
 588				maps += GB_SIZE_MAP;
 589			}
 590			GBVideoSoftwareRendererDrawBackground(softwareRenderer, maps, wx, endX, -wx - softwareRenderer->offsetWx, y - wy - softwareRenderer->offsetWy, renderer->highlightWIN);
 591		} else if (!softwareRenderer->d.disableBG) {
 592			GBVideoSoftwareRendererDrawBackground(softwareRenderer, maps, startX, endX, softwareRenderer->scx - softwareRenderer->offsetScx, softwareRenderer->scy + y - softwareRenderer->offsetScy, renderer->highlightBG);
 593		}
 594	} else if (!softwareRenderer->d.disableBG) {
 595		memset(&softwareRenderer->row[startX], 0, (endX - startX) * sizeof(softwareRenderer->row[0]));
 596	}
 597
 598	if (GBRegisterLCDCIsObjEnable(softwareRenderer->lcdc) && !softwareRenderer->d.disableOBJ) {
 599		if (startX == 0) {
 600			_cleanOAM(softwareRenderer, y);
 601		}
 602		int i;
 603		for (i = 0; i < softwareRenderer->objMax; ++i) {
 604			GBVideoSoftwareRendererDrawObj(softwareRenderer, &softwareRenderer->obj[i], startX, endX, y);
 605		}
 606	}
 607
 608	unsigned highlightAmount = (renderer->highlightAmount + 6) >> 4;
 609	if (softwareRenderer->lastHighlightAmount != highlightAmount) {
 610		softwareRenderer->lastHighlightAmount = highlightAmount;
 611		int i;
 612		for (i = 0; i < PAL_SGB_BORDER; ++i) {
 613			if (i >= PAL_OBJ && (i & 3) == 0) {
 614				continue;
 615			}
 616			softwareRenderer->palette[i + PAL_HIGHLIGHT] = mColorMix5Bit(0x10 - highlightAmount, softwareRenderer->palette[i], highlightAmount, renderer->highlightColor);
 617		}
 618	}
 619
 620	size_t sgbOffset = 0;
 621	if (softwareRenderer->model & GB_MODEL_SGB && softwareRenderer->sgbBorders) {
 622		sgbOffset = softwareRenderer->outputBufferStride * 40 + 48;
 623	}
 624	color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y + sgbOffset];
 625	int x = startX;
 626	int p = 0;
 627	switch (softwareRenderer->d.sgbRenderMode) {
 628	case 0:
 629		if (softwareRenderer->model & GB_MODEL_SGB) {
 630			p = softwareRenderer->d.sgbAttributes[(startX >> 5) + 5 * (y >> 3)];
 631			p >>= 6 - ((x / 4) & 0x6);
 632			p &= 3;
 633			p <<= 2;
 634		}
 635		for (; x < ((startX + 7) & ~7) && x < endX; ++x) {
 636			row[x] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x] & OBJ_PRIO_MASK]];
 637		}
 638		for (; x + 7 < (endX & ~7); x += 8) {
 639			if (softwareRenderer->model & GB_MODEL_SGB) {
 640				p = softwareRenderer->d.sgbAttributes[(x >> 5) + 5 * (y >> 3)];
 641				p >>= 6 - ((x / 4) & 0x6);
 642				p &= 3;
 643				p <<= 2;
 644			}
 645			row[x + 0] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x] & OBJ_PRIO_MASK]];
 646			row[x + 1] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 1] & OBJ_PRIO_MASK]];
 647			row[x + 2] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 2] & OBJ_PRIO_MASK]];
 648			row[x + 3] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 3] & OBJ_PRIO_MASK]];
 649			row[x + 4] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 4] & OBJ_PRIO_MASK]];
 650			row[x + 5] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 5] & OBJ_PRIO_MASK]];
 651			row[x + 6] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 6] & OBJ_PRIO_MASK]];
 652			row[x + 7] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x + 7] & OBJ_PRIO_MASK]];
 653		}
 654		if (softwareRenderer->model & GB_MODEL_SGB) {
 655			p = softwareRenderer->d.sgbAttributes[(x >> 5) + 5 * (y >> 3)];
 656			p >>= 6 - ((x / 4) & 0x6);
 657			p &= 3;
 658			p <<= 2;
 659		}
 660		for (; x < endX; ++x) {
 661			row[x] = softwareRenderer->palette[p | softwareRenderer->lookup[softwareRenderer->row[x] & OBJ_PRIO_MASK]];
 662		}
 663		break;
 664	case 1:
 665		break;
 666	case 2:
 667		for (; x < ((startX + 7) & ~7) && x < endX; ++x) {
 668			row[x] = 0;
 669		}
 670		for (; x + 7 < (endX & ~7); x += 8) {
 671			row[x] = 0;
 672			row[x + 1] = 0;
 673			row[x + 2] = 0;
 674			row[x + 3] = 0;
 675			row[x + 4] = 0;
 676			row[x + 5] = 0;
 677			row[x + 6] = 0;
 678			row[x + 7] = 0;
 679		}
 680		for (; x < endX; ++x) {
 681			row[x] = 0;
 682		}
 683		break;
 684	case 3:
 685		for (; x < ((startX + 7) & ~7) && x < endX; ++x) {
 686			row[x] = softwareRenderer->palette[0];
 687		}
 688		for (; x + 7 < (endX & ~7); x += 8) {
 689			row[x] = softwareRenderer->palette[0];
 690			row[x + 1] = softwareRenderer->palette[0];
 691			row[x + 2] = softwareRenderer->palette[0];
 692			row[x + 3] = softwareRenderer->palette[0];
 693			row[x + 4] = softwareRenderer->palette[0];
 694			row[x + 5] = softwareRenderer->palette[0];
 695			row[x + 6] = softwareRenderer->palette[0];
 696			row[x + 7] = softwareRenderer->palette[0];
 697		}
 698		for (; x < endX; ++x) {
 699			row[x] = softwareRenderer->palette[0];
 700		}
 701		break;
 702	}
 703}
 704
 705static void GBVideoSoftwareRendererFinishScanline(struct GBVideoRenderer* renderer, int y) {
 706	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 707
 708	softwareRenderer->lastX = 0;
 709	softwareRenderer->currentWx = 0;
 710
 711	if (softwareRenderer->sgbTransfer == 1) {
 712		size_t offset = 2 * ((y & 7) + (y >> 3) * GB_VIDEO_HORIZONTAL_PIXELS);
 713		if (offset >= 0x1000) {
 714			return;
 715		}
 716		uint8_t* buffer = NULL;
 717		switch (softwareRenderer->sgbCommandHeader >> 3) {
 718		case SGB_PAL_TRN:
 719			buffer = renderer->sgbPalRam;
 720			break;
 721		case SGB_CHR_TRN:
 722			buffer = &renderer->sgbCharRam[SGB_SIZE_CHAR_RAM / 2 * (softwareRenderer->sgbPacket[1] & 1)];
 723			break;
 724		case SGB_PCT_TRN:
 725			buffer = renderer->sgbMapRam;
 726			break;
 727		case SGB_ATTR_TRN:
 728			buffer = renderer->sgbAttributeFiles;
 729			break;
 730		default:
 731			break;
 732		}
 733		if (buffer) {
 734			int i;
 735			for (i = 0; i < GB_VIDEO_HORIZONTAL_PIXELS; i += 8) {
 736				if (UNLIKELY(offset + (i << 1) + 1 >= 0x1000)) {
 737					break;
 738				}
 739				uint8_t hi = 0;
 740				uint8_t lo = 0;
 741				hi |= (softwareRenderer->row[i + 0] & 0x2) << 6;
 742				lo |= (softwareRenderer->row[i + 0] & 0x1) << 7;
 743				hi |= (softwareRenderer->row[i + 1] & 0x2) << 5;
 744				lo |= (softwareRenderer->row[i + 1] & 0x1) << 6;
 745				hi |= (softwareRenderer->row[i + 2] & 0x2) << 4;
 746				lo |= (softwareRenderer->row[i + 2] & 0x1) << 5;
 747				hi |= (softwareRenderer->row[i + 3] & 0x2) << 3;
 748				lo |= (softwareRenderer->row[i + 3] & 0x1) << 4;
 749				hi |= (softwareRenderer->row[i + 4] & 0x2) << 2;
 750				lo |= (softwareRenderer->row[i + 4] & 0x1) << 3;
 751				hi |= (softwareRenderer->row[i + 5] & 0x2) << 1;
 752				lo |= (softwareRenderer->row[i + 5] & 0x1) << 2;
 753				hi |= (softwareRenderer->row[i + 6] & 0x2) << 0;
 754				lo |= (softwareRenderer->row[i + 6] & 0x1) << 1;
 755				hi |= (softwareRenderer->row[i + 7] & 0x2) >> 1;
 756				lo |= (softwareRenderer->row[i + 7] & 0x1) >> 0;
 757				buffer[offset + (i << 1) + 0] = lo;
 758				buffer[offset + (i << 1) + 1] = hi;
 759			}
 760		}
 761	}
 762}
 763
 764static void GBVideoSoftwareRendererFinishFrame(struct GBVideoRenderer* renderer) {
 765	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 766
 767	if (softwareRenderer->temporaryBuffer) {
 768		mappedMemoryFree(softwareRenderer->temporaryBuffer, GB_VIDEO_HORIZONTAL_PIXELS * GB_VIDEO_VERTICAL_PIXELS * 4);
 769		softwareRenderer->temporaryBuffer = 0;
 770	}
 771	if (!GBRegisterLCDCIsEnable(softwareRenderer->lcdc)) {
 772		_clearScreen(softwareRenderer);
 773	}
 774	if (softwareRenderer->model & GB_MODEL_SGB) {
 775		switch (softwareRenderer->sgbCommandHeader >> 3) {
 776		case SGB_PAL_SET:
 777		case SGB_ATTR_SET:
 778			if (softwareRenderer->sgbPacket[1] & 0x40) {
 779				renderer->sgbRenderMode = 0;
 780			}
 781			break;
 782		case SGB_PAL_TRN:
 783		case SGB_CHR_TRN:
 784		case SGB_PCT_TRN:
 785		case SGB_ATRC_EN:
 786		case SGB_MASK_EN:
 787			if (softwareRenderer->sgbBorders && !renderer->sgbRenderMode) {
 788				// Make sure every buffer sees this if we're multibuffering
 789				_regenerateSGBBorder(softwareRenderer);
 790			}
 791			// Fall through
 792		case SGB_ATTR_TRN:
 793			++softwareRenderer->sgbTransfer;
 794			if (softwareRenderer->sgbTransfer == 5) {
 795				softwareRenderer->sgbCommandHeader = 0;
 796			}
 797			break;
 798		default:
 799			break;
 800		}
 801	}
 802	softwareRenderer->lastY = GB_VIDEO_VERTICAL_PIXELS;
 803	softwareRenderer->lastX = 0;
 804	softwareRenderer->currentWy = 0;
 805	softwareRenderer->currentWx = 0;
 806	softwareRenderer->hasWindow = false;
 807}
 808
 809static void GBVideoSoftwareRendererEnableSGBBorder(struct GBVideoRenderer* renderer, bool enable) {
 810	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 811	if (softwareRenderer->model & GB_MODEL_SGB) {
 812		if (enable == softwareRenderer->sgbBorders) {
 813			return;
 814		}
 815		softwareRenderer->sgbBorders = enable;
 816		if (softwareRenderer->sgbBorders && !renderer->sgbRenderMode) {
 817			_regenerateSGBBorder(softwareRenderer);
 818		}
 819	}
 820}
 821
 822static void GBVideoSoftwareRendererDrawBackground(struct GBVideoSoftwareRenderer* renderer, uint8_t* maps, int startX, int endX, int sx, int sy, bool highlight) {
 823	uint8_t* data = renderer->d.vram;
 824	uint8_t* attr = &maps[GB_SIZE_VRAM_BANK0];
 825	if (!GBRegisterLCDCIsTileData(renderer->lcdc)) {
 826		data += 0x1000;
 827	}
 828	int topY = ((sy >> 3) & 0x1F) * 0x20;
 829	int bottomY = sy & 7;
 830	if (startX < 0) {
 831		startX = 0;
 832	}
 833	int x;
 834	if ((startX + sx) & 7) {
 835		int startX2 = startX + 8 - ((startX + sx) & 7);
 836		for (x = startX; x < startX2; ++x) {
 837			uint8_t* localData = data;
 838			int localY = bottomY;
 839			int topX = ((x + sx) >> 3) & 0x1F;
 840			int bottomX = 7 - ((x + sx) & 7);
 841			int bgTile;
 842			if (GBRegisterLCDCIsTileData(renderer->lcdc)) {
 843				bgTile = maps[topX + topY];
 844			} else {
 845				bgTile = ((int8_t*) maps)[topX + topY];
 846			}
 847			int p = highlight ? PAL_HIGHLIGHT_BG : PAL_BG;
 848			if (renderer->model >= GB_MODEL_CGB) {
 849				GBObjAttributes attrs = attr[topX + topY];
 850				p |= GBObjAttributesGetCGBPalette(attrs) * 4;
 851				if (GBObjAttributesIsPriority(attrs) && GBRegisterLCDCIsBgEnable(renderer->lcdc)) {
 852					p |= OBJ_PRIORITY;
 853				}
 854				if (GBObjAttributesIsBank(attrs)) {
 855					localData += GB_SIZE_VRAM_BANK0;
 856				}
 857				if (GBObjAttributesIsYFlip(attrs)) {
 858					localY = 7 - bottomY;
 859				}
 860				if (GBObjAttributesIsXFlip(attrs)) {
 861					bottomX = 7 - bottomX;
 862				}
 863			}
 864			uint8_t tileDataLower = localData[(bgTile * 8 + localY) * 2];
 865			uint8_t tileDataUpper = localData[(bgTile * 8 + localY) * 2 + 1];
 866			tileDataUpper >>= bottomX;
 867			tileDataLower >>= bottomX;
 868			renderer->row[x] = p | ((tileDataUpper & 1) << 1) | (tileDataLower & 1);
 869		}
 870		startX = startX2;
 871	}
 872	for (x = startX; x < endX; x += 8) {
 873		uint8_t* localData = data;
 874		int localY = bottomY;
 875		int topX = ((x + sx) >> 3) & 0x1F;
 876		int bgTile;
 877		if (GBRegisterLCDCIsTileData(renderer->lcdc)) {
 878			bgTile = maps[topX + topY];
 879		} else {
 880			bgTile = ((int8_t*) maps)[topX + topY];
 881		}
 882		int p = highlight ? PAL_HIGHLIGHT_BG : PAL_BG;
 883		if (renderer->model >= GB_MODEL_CGB) {
 884			GBObjAttributes attrs = attr[topX + topY];
 885			p |= GBObjAttributesGetCGBPalette(attrs) * 4;
 886			if (GBObjAttributesIsPriority(attrs) && GBRegisterLCDCIsBgEnable(renderer->lcdc)) {
 887				p |= OBJ_PRIORITY;
 888			}
 889			if (GBObjAttributesIsBank(attrs)) {
 890				localData += GB_SIZE_VRAM_BANK0;
 891			}
 892			if (GBObjAttributesIsYFlip(attrs)) {
 893				localY = 7 - bottomY;
 894			}
 895			if (GBObjAttributesIsXFlip(attrs)) {
 896				uint8_t tileDataLower = localData[(bgTile * 8 + localY) * 2];
 897				uint8_t tileDataUpper = localData[(bgTile * 8 + localY) * 2 + 1];
 898				renderer->row[x + 0] = p | ((tileDataUpper & 1) << 1) | (tileDataLower & 1);
 899				renderer->row[x + 1] = p | (tileDataUpper & 2) | ((tileDataLower & 2) >> 1);
 900				renderer->row[x + 2] = p | ((tileDataUpper & 4) >> 1) | ((tileDataLower & 4) >> 2);
 901				renderer->row[x + 3] = p | ((tileDataUpper & 8) >> 2) | ((tileDataLower & 8) >> 3);
 902				renderer->row[x + 4] = p | ((tileDataUpper & 16) >> 3) | ((tileDataLower & 16) >> 4);
 903				renderer->row[x + 5] = p | ((tileDataUpper & 32) >> 4) | ((tileDataLower & 32) >> 5);
 904				renderer->row[x + 6] = p | ((tileDataUpper & 64) >> 5) | ((tileDataLower & 64) >> 6);
 905				renderer->row[x + 7] = p | ((tileDataUpper & 128) >> 6) | ((tileDataLower & 128) >> 7);
 906				continue;
 907			}
 908		}
 909		uint8_t tileDataLower = localData[(bgTile * 8 + localY) * 2];
 910		uint8_t tileDataUpper = localData[(bgTile * 8 + localY) * 2 + 1];
 911		renderer->row[x + 7] = p | ((tileDataUpper & 1) << 1) | (tileDataLower & 1);
 912		renderer->row[x + 6] = p | (tileDataUpper & 2) | ((tileDataLower & 2) >> 1);
 913		renderer->row[x + 5] = p | ((tileDataUpper & 4) >> 1) | ((tileDataLower & 4) >> 2);
 914		renderer->row[x + 4] = p | ((tileDataUpper & 8) >> 2) | ((tileDataLower & 8) >> 3);
 915		renderer->row[x + 3] = p | ((tileDataUpper & 16) >> 3) | ((tileDataLower & 16) >> 4);
 916		renderer->row[x + 2] = p | ((tileDataUpper & 32) >> 4) | ((tileDataLower & 32) >> 5);
 917		renderer->row[x + 1] = p | ((tileDataUpper & 64) >> 5) | ((tileDataLower & 64) >> 6);
 918		renderer->row[x + 0] = p | ((tileDataUpper & 128) >> 6) | ((tileDataLower & 128) >> 7);
 919	}
 920}
 921
 922static void GBVideoSoftwareRendererDrawObj(struct GBVideoSoftwareRenderer* renderer, struct GBVideoRendererSprite* obj, int startX, int endX, int y) {
 923	int objX = obj->obj.x + renderer->objOffsetX;
 924	int ix = objX - 8;
 925	if (endX < ix || startX >= ix + 8) {
 926		return;
 927	}
 928	if (objX < endX) {
 929		endX = objX;
 930	}
 931	if (objX - 8 > startX) {
 932		startX = objX - 8;
 933	}
 934	if (startX < 0) {
 935		startX = 0;
 936	}
 937	uint8_t* data = renderer->d.vram;
 938	int tileOffset = 0;
 939	int bottomY;
 940	int objY = obj->obj.y + renderer->objOffsetY;
 941	if (GBObjAttributesIsYFlip(obj->obj.attr)) {
 942		bottomY = 7 - ((y - objY - 16) & 7);
 943		if (GBRegisterLCDCIsObjSize(renderer->lcdc) && y - objY < -8) {
 944			++tileOffset;
 945		}
 946	} else {
 947		bottomY = (y - objY - 16) & 7;
 948		if (GBRegisterLCDCIsObjSize(renderer->lcdc) && y - objY >= -8) {
 949			++tileOffset;
 950		}
 951	}
 952	if (GBRegisterLCDCIsObjSize(renderer->lcdc) && obj->obj.tile & 1) {
 953		--tileOffset;
 954	}
 955	unsigned mask = GBObjAttributesIsPriority(obj->obj.attr) ? 0x63 : 0x60;
 956	unsigned mask2 = GBObjAttributesIsPriority(obj->obj.attr) ? 0 : (OBJ_PRIORITY | 3);
 957	int p = renderer->d.highlightOBJ[obj->index] ? PAL_HIGHLIGHT_OBJ : PAL_OBJ;
 958	if (renderer->model >= GB_MODEL_CGB) {
 959		p |= GBObjAttributesGetCGBPalette(obj->obj.attr) * 4;
 960		if (GBObjAttributesIsBank(obj->obj.attr)) {
 961			data += GB_SIZE_VRAM_BANK0;
 962		}
 963		if (!GBRegisterLCDCIsBgEnable(renderer->lcdc)) {
 964			mask = 0x60;
 965			mask2 = OBJ_PRIORITY | 3;
 966		}
 967	} else {
 968		p |= (GBObjAttributesGetPalette(obj->obj.attr) + 8) * 4;
 969	}
 970	int bottomX;
 971	int x = startX;
 972	int objTile = obj->obj.tile + tileOffset;
 973	if ((x - objX) & 7) {
 974		for (; x < endX; ++x) {
 975			if (GBObjAttributesIsXFlip(obj->obj.attr)) {
 976				bottomX = (x - objX) & 7;
 977			} else {
 978				bottomX = 7 - ((x - objX) & 7);
 979			}
 980			uint8_t tileDataLower = data[(objTile * 8 + bottomY) * 2];
 981			uint8_t tileDataUpper = data[(objTile * 8 + bottomY) * 2 + 1];
 982			tileDataUpper >>= bottomX;
 983			tileDataLower >>= bottomX;
 984			unsigned current = renderer->row[x];
 985			if (((tileDataUpper | tileDataLower) & 1) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
 986				renderer->row[x] = p | ((tileDataUpper & 1) << 1) | (tileDataLower & 1);
 987			}
 988		}
 989	} else if (GBObjAttributesIsXFlip(obj->obj.attr)) {
 990		uint8_t tileDataLower = data[(objTile * 8 + bottomY) * 2];
 991		uint8_t tileDataUpper = data[(objTile * 8 + bottomY) * 2 + 1];
 992		unsigned current;
 993		current = renderer->row[x];
 994		if (((tileDataUpper | tileDataLower) & 1) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
 995			renderer->row[x] = p | ((tileDataUpper & 1) << 1) | (tileDataLower & 1);
 996		}
 997		current = renderer->row[x + 1];
 998		if (((tileDataUpper | tileDataLower) & 2) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
 999			renderer->row[x + 1] = p | (tileDataUpper & 2) | ((tileDataLower & 2) >> 1);
1000		}
1001		current = renderer->row[x + 2];
1002		if (((tileDataUpper | tileDataLower) & 4) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1003			renderer->row[x + 2] = p | ((tileDataUpper & 4) >> 1) | ((tileDataLower & 4) >> 2);
1004		}
1005		current = renderer->row[x + 3];
1006		if (((tileDataUpper | tileDataLower) & 8) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1007			renderer->row[x + 3] = p | ((tileDataUpper & 8) >> 2) | ((tileDataLower & 8) >> 3);
1008		}
1009		current = renderer->row[x + 4];
1010		if (((tileDataUpper | tileDataLower) & 16) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1011			renderer->row[x + 4] = p | ((tileDataUpper & 16) >> 3) | ((tileDataLower & 16) >> 4);
1012		}
1013		current = renderer->row[x + 5];
1014		if (((tileDataUpper | tileDataLower) & 32) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1015			renderer->row[x + 5] = p | ((tileDataUpper & 32) >> 4) | ((tileDataLower & 32) >> 5);
1016		}
1017		current = renderer->row[x + 6];
1018		if (((tileDataUpper | tileDataLower) & 64) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1019			renderer->row[x + 6] = p | ((tileDataUpper & 64) >> 5) | ((tileDataLower & 64) >> 6);
1020		}
1021		current = renderer->row[x + 7];
1022		if (((tileDataUpper | tileDataLower) & 128) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1023			renderer->row[x + 7] = p | ((tileDataUpper & 128) >> 6) | ((tileDataLower & 128) >> 7);
1024		}
1025	} else {
1026		uint8_t tileDataLower = data[(objTile * 8 + bottomY) * 2];
1027		uint8_t tileDataUpper = data[(objTile * 8 + bottomY) * 2 + 1];
1028		unsigned current;
1029		current = renderer->row[x + 7];
1030		if (((tileDataUpper | tileDataLower) & 1) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1031			renderer->row[x + 7] = p | ((tileDataUpper & 1) << 1) | (tileDataLower & 1);
1032		}
1033		current = renderer->row[x + 6];
1034		if (((tileDataUpper | tileDataLower) & 2) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1035			renderer->row[x + 6] = p | (tileDataUpper & 2) | ((tileDataLower & 2) >> 1);
1036		}
1037		current = renderer->row[x + 5];
1038		if (((tileDataUpper | tileDataLower) & 4) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1039			renderer->row[x + 5] = p | ((tileDataUpper & 4) >> 1) | ((tileDataLower & 4) >> 2);
1040		}
1041		current = renderer->row[x + 4];
1042		if (((tileDataUpper | tileDataLower) & 8) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1043			renderer->row[x + 4] = p | ((tileDataUpper & 8) >> 2) | ((tileDataLower & 8) >> 3);
1044		}
1045		current = renderer->row[x + 3];
1046		if (((tileDataUpper | tileDataLower) & 16) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1047			renderer->row[x + 3] = p | ((tileDataUpper & 16) >> 3) | ((tileDataLower & 16) >> 4);
1048		}
1049		current = renderer->row[x + 2];
1050		if (((tileDataUpper | tileDataLower) & 32) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1051			renderer->row[x + 2] = p | ((tileDataUpper & 32) >> 4) | ((tileDataLower & 32) >> 5);
1052		}
1053		current = renderer->row[x + 1];
1054		if (((tileDataUpper | tileDataLower) & 64) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1055			renderer->row[x + 1] = p | ((tileDataUpper & 64) >> 5) | ((tileDataLower & 64) >> 6);
1056		}
1057		current = renderer->row[x];
1058		if (((tileDataUpper | tileDataLower) & 128) && !(current & mask) && (current & mask2) <= OBJ_PRIORITY) {
1059			renderer->row[x] = p | ((tileDataUpper & 128) >> 6) | ((tileDataLower & 128) >> 7);
1060		}
1061	}
1062}
1063
1064static void GBVideoSoftwareRendererGetPixels(struct GBVideoRenderer* renderer, size_t* stride, const void** pixels) {
1065	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
1066	*stride = softwareRenderer->outputBufferStride;
1067	*pixels = softwareRenderer->outputBuffer;
1068}
1069
1070static void GBVideoSoftwareRendererPutPixels(struct GBVideoRenderer* renderer, size_t stride, const void* pixels) {
1071	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
1072	// TODO: Share with GBAVideoSoftwareRendererGetPixels
1073
1074	const color_t* colorPixels = pixels;
1075	unsigned i;
1076	for (i = 0; i < GB_VIDEO_VERTICAL_PIXELS; ++i) {
1077		memmove(&softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * i], &colorPixels[stride * i], GB_VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL);
1078	}
1079}