Mercurial > vba-linux

     1 #include <cstring>

     2 

     3 #include "gbGlobals.h"

     4 #include "gbSGB.h"

     5 

     6 extern int32 layerSettings;

     7 

     8 u8 gbInvertTab[256] = {

     9 	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,

    10 	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,

    11 	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,

    12 	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,

    13 	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,

    14 	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,

    15 	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,

    16 	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,

    17 	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,

    18 	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,

    19 	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,

    20 	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,

    21 	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,

    22 	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,

    23 	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,

    24 	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,

    25 	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,

    26 	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,

    27 	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,

    28 	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,

    29 	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,

    30 	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,

    31 	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,

    32 	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,

    33 	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,

    34 	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,

    35 	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,

    36 	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,

    37 	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,

    38 	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,

    39 	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,

    40 	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff

    41 };

    42 

    43 u16 gbLineMix[160];

    44 

    45 void gbRenderLine()

    46 {

    47 	u8 *bank0;

    48 	u8 *bank1;

    49 	if (gbCgbMode)

    50 	{

    51 		bank0 = &gbVram[0x0000];

    52 		bank1 = &gbVram[0x2000];

    53 	}

    54 	else

    55 	{

    56 		bank0 = &gbMemory[0x8000];

    57 		bank1 = NULL;

    58 	}

    59 

    60 	int tile_map = 0x1800;

    61 	if ((register_LCDC & 8) != 0)

    62 		tile_map = 0x1c00;

    63 

    64 	int tile_pattern = 0x0800;

    65 

    66 	if ((register_LCDC & 16) != 0)

    67 		tile_pattern = 0x0000;

    68 

    69 	int x = 0;

    70 	int y = register_LY;

    71 

    72 	if (y >= 144)

    73 		return;

    74 

    75 	//  int yLine = (y + gbBorderRowSkip) * gbBorderLineSkip;

    76 

    77 	int sx = register_SCX;

    78 	int sy = register_SCY;

    79 

    80 	sy += y;

    81 

    82 	sy &= 255;

    83 

    84 	int tx = sx >> 3;

    85 	int ty = sy >> 3;

    86 

    87 	int bx = 1 << (7 - (sx & 7));

    88 	int by = sy & 7;

    89 

    90 	int tile_map_line_y = tile_map + ty * 32;

    91 

    92 	int tile_map_address = tile_map_line_y + tx;

    93 

    94 	u8 attrs = 0;

    95 	if (bank1 != NULL)

    96 		attrs = bank1[tile_map_address];

    97 

    98 	u8 tile = bank0[tile_map_address];

    99 

   100 	tile_map_address++;

   101 

   102 	if ((register_LCDC & 16) == 0)

   103 	{

   104 		if (tile < 128)

   105 			tile += 128;

   106 		else

   107 			tile -= 128;

   108 	}

   109 

   110 	int tile_pattern_address = tile_pattern + tile * 16 + by*2;

   111 

   112 	if (register_LCDC & 0x80)

   113 	{

   114 		if ((register_LCDC & 0x01 || gbCgbMode) && (layerSettings & 0x0100))

   115 		{

   116 			while (x < 160)

   117 			{

   118 				u8 tile_a = 0;

   119 				u8 tile_b = 0;

   120 

   121 				if (attrs & 0x40)

   122 				{

   123 					tile_pattern_address = tile_pattern + tile * 16 + (7-by)*2;

   124 				}

   125 

   126 				if (attrs & 0x08)

   127 				{

   128 					tile_a = bank1[tile_pattern_address++];

   129 					tile_b = bank1[tile_pattern_address];

   130 				}

   131 				else

   132 				{

   133 					tile_a = bank0[tile_pattern_address++];

   134 					tile_b = bank0[tile_pattern_address];

   135 				}

   136 

   137 				if (attrs & 0x20)

   138 				{

   139 					tile_a = gbInvertTab[tile_a];

   140 					tile_b = gbInvertTab[tile_b];

   141 				}

   142 

   143 				while (bx > 0)

   144 				{

   145 					u8 c = (tile_a & bx) ? 1 : 0;

   146 					c += ((tile_b & bx) ? 2 : 0);

   147 

   148 					gbLineBuffer[x] = c; // mark the gbLineBuffer color

   149 

   150 					if (attrs & 0x80)

   151 						gbLineBuffer[x] |= 0x300;

   152 

   153 					if (gbCgbMode)

   154 					{

   155 						c = c + (attrs & 7)*4;

   156 					}

   157 					else

   158 					{

   159 						c = gbBgp[c];

   160 						if (gbSgbMode && !gbCgbMode)

   161 						{

   162 							int dx = x >> 3;

   163 							int dy = y >> 3;

   164 

   165 							int palette = gbSgbATF[dy * 20 + dx];

   166 

   167 							if (c == 0)

   168 								palette = 0;

   169 

   170 							c = c + 4*palette;

   171 						}

   172 					}

   173 					gbLineMix[x] = gbColorOption ? gbColorFilter[gbPalette[c]] :

   174 					               gbPalette[c];

   175 					x++;

   176 					if (x >= 160)

   177 						break;

   178 					bx >>= 1;

   179 				}

   180 				tx++;

   181 				if (tx == 32)

   182 					tx = 0;

   183 				bx = 128;

   184 

   185 				if (bank1)

   186 					attrs = bank1[tile_map_line_y + tx];

   187 

   188 				tile = bank0[tile_map_line_y + tx];

   189 

   190 				if ((register_LCDC & 16) == 0)

   191 				{

   192 					if (tile < 128)

   193 						tile += 128;

   194 					else

   195 						tile -= 128;

   196 				}

   197 				tile_pattern_address = tile_pattern + tile * 16 + by * 2;

   198 			}

   199 		}

   200 		else

   201 		{

   202 			for (int i = 0; i < 160; i++)

   203 			{

   204 				gbLineMix[i]    = gbPalette[0];

   205 				gbLineBuffer[i] = 0;

   206 			}

   207 		}

   208 

   209 		// do the window display

   210 		if ((register_LCDC & 0x20) && (layerSettings & 0x2000))

   211 		{

   212 			int wy = register_WY;

   213 

   214 			if (y >= wy)

   215 			{

   216 				int wx = register_WX;

   217 				wx -= 7;

   218 

   219 				if (wx <= 159 && gbWindowLine <= 143)

   220 				{

   221 					tile_map = 0x1800;

   222 

   223 					if ((register_LCDC & 0x40) != 0)

   224 						tile_map = 0x1c00;

   225 

   226 					if (gbWindowLine == -1)

   227 					{

   228 						gbWindowLine = 0;

   229 					}

   230 

   231 					tx = 0;

   232 					ty = gbWindowLine >> 3;

   233 

   234 					bx = 128;

   235 					by = gbWindowLine & 7;

   236 

   237 					if (wx < 0)

   238 					{

   239 						bx >>= (-wx);

   240 						wx   = 0;

   241 					}

   242 

   243 					tile_map_line_y = tile_map + ty * 32;

   244 

   245 					tile_map_address = tile_map_line_y + tx;

   246 

   247 					x = wx;

   248 

   249 					tile = bank0[tile_map_address];

   250 					u8 attrs = 0;

   251 					if (bank1)

   252 						attrs = bank1[tile_map_address];

   253 					tile_map_address++;

   254 

   255 					if ((register_LCDC & 16) == 0)

   256 					{

   257 						if (tile < 128)

   258 							tile += 128;

   259 						else

   260 							tile -= 128;

   261 					}

   262 

   263 					tile_pattern_address = tile_pattern + tile * 16 + by*2;

   264 

   265 					while (x < 160)

   266 					{

   267 						u8 tile_a = 0;

   268 						u8 tile_b = 0;

   269 

   270 						if (attrs & 0x40)

   271 						{

   272 							tile_pattern_address = tile_pattern + tile * 16 + (7-by)*2;

   273 						}

   274 

   275 						if (attrs & 0x08)

   276 						{

   277 							tile_a = bank1[tile_pattern_address++];

   278 							tile_b = bank1[tile_pattern_address];

   279 						}

   280 						else

   281 						{

   282 							tile_a = bank0[tile_pattern_address++];

   283 							tile_b = bank0[tile_pattern_address];

   284 						}

   285 

   286 						if (attrs & 0x20)

   287 						{

   288 							tile_a = gbInvertTab[tile_a];

   289 							tile_b = gbInvertTab[tile_b];

   290 						}

   291 

   292 						while (bx > 0)

   293 						{

   294 							u8 c = (tile_a & bx) != 0 ? 1 : 0;

   295 							c += ((tile_b & bx) != 0 ? 2 : 0);

   296 

   297 							if (attrs & 0x80)

   298 								gbLineBuffer[x] = 0x300 + c;

   299 							else

   300 								gbLineBuffer[x] = 0x100 + c;

   301 

   302 							if (gbCgbMode)

   303 							{

   304 								c = c + (attrs & 7) * 4;

   305 							}

   306 							else

   307 							{

   308 								c = gbBgp[c];

   309 								if (gbSgbMode && !gbCgbMode)

   310 								{

   311 									int dx = x >> 3;

   312 									int dy = y >> 3;

   313 

   314 									int palette = gbSgbATF[dy * 20 + dx];

   315 

   316 									if (c == 0)

   317 										palette = 0;

   318 

   319 									c = c + 4*palette;

   320 								}

   321 							}

   322 							gbLineMix[x] = gbColorOption ? gbColorFilter[gbPalette[c]] :

   323 							               gbPalette[c];

   324 							x++;

   325 							if (x >= 160)

   326 								break;

   327 							bx >>= 1;

   328 						}

   329 						tx++;

   330 						if (tx == 32)

   331 							tx = 0;

   332 						bx   = 128;

   333 						tile = bank0[tile_map_line_y + tx];

   334 						if (bank1)

   335 							attrs = bank1[tile_map_line_y + tx];

   336 

   337 						if ((register_LCDC & 16) == 0)

   338 						{

   339 							if (tile < 128)

   340 								tile += 128;

   341 							else

   342 								tile -= 128;

   343 						}

   344 						tile_pattern_address = tile_pattern + tile * 16 + by * 2;

   345 					}

   346 					gbWindowLine++;

   347 				}

   348 			}

   349 		}

   350 	}

   351 	else

   352 	{

   353 		for (int i = 0; i < 160; i++)

   354 		{

   355 			gbLineMix[i]    = gbPalette[0];

   356 			gbLineBuffer[i] = 0;

   357 		}

   358 	}

   359 }

   360 

   361 void gbDrawSpriteTile(int tile, int x, int y, int t, int flags,

   362                       int size, int spriteNumber)

   363 {

   364 	u8 *bank0;

   365 	u8 *bank1;

   366 	if (gbCgbMode)

   367 	{

   368 		if (register_VBK & 1)

   369 		{

   370 			bank0 = &gbVram[0x0000];

   371 			bank1 = &gbVram[0x2000];

   372 		}

   373 		else

   374 		{

   375 			bank0 = &gbVram[0x0000];

   376 			bank1 = &gbVram[0x2000];

   377 		}

   378 	}

   379 	else

   380 	{

   381 		bank0 = &gbMemory[0x8000];

   382 		bank1 = NULL;

   383 	}

   384 

   385 	int init = 0x0000;

   386 

   387 	//  int yLine = (y+gbBorderRowSkip) * gbBorderLineSkip;

   388 

   389 	u8 *pal = gbObp0;

   390 

   391 	int flipx = (flags & 0x20);

   392 	int flipy = (flags & 0x40);

   393 

   394 	if ((flags & 0x10))

   395 		pal = gbObp1;

   396 

   397 	if (flipy)

   398 	{

   399 		t = (size ? 15 : 7) - t;

   400 	}

   401 

   402 	int prio =  flags & 0x80;

   403 

   404 	int address = init + tile * 16 + 2*t;

   405 	int a       = 0;

   406 	int b       = 0;

   407 

   408 	if (gbCgbMode && flags & 0x08)

   409 	{

   410 		a = bank1[address++];

   411 		b = bank1[address++];

   412 	}

   413 	else

   414 	{

   415 		a = bank0[address++];

   416 		b = bank0[address++];

   417 	}

   418 

   419 	for (int xx = 0; xx < 8; xx++)

   420 	{

   421 		u8 mask = 1 << (7-xx);

   422 		u8 c    = 0;

   423 		if ((a & mask))

   424 			c++;

   425 		if ((b & mask))

   426 			c += 2;

   427 

   428 		if (c == 0)

   429 			continue;

   430 

   431 		int xxx = xx+x;

   432 		if (flipx)

   433 			xxx = (7-xx+x);

   434 

   435 		if (xxx < 0 || xxx > 159)

   436 			continue;

   437 

   438 		u16 color = gbLineBuffer[xxx];

   439 

   440 		if (prio)

   441 		{

   442 			if (color < 0x200 && ((color & 0xFF) != 0))

   443 				continue;

   444 		}

   445 		if (color >= 0x300 && color != 0x300)

   446 			continue;

   447 		else if (color >= 0x200 && color < 0x300)

   448 		{

   449 			int sprite = color & 0xff;

   450 

   451 			int spriteX = gbMemory[0xfe00 + 4 * sprite + 1] - 8;

   452 

   453 			if (spriteX == x)

   454 			{

   455 				if (sprite < spriteNumber)

   456 					continue;

   457 			}

   458 			else

   459 			{

   460 				if (gbCgbMode)

   461 				{

   462 					if (sprite < spriteNumber)

   463 						continue;

   464 				}

   465 				else

   466 				{

   467 					if (spriteX < x+8)

   468 						continue;

   469 				}

   470 			}

   471 		}

   472 

   473 		gbLineBuffer[xxx] = 0x200 + spriteNumber;

   474 

   475 		// make sure that sprites will work even in CGB mode

   476 		if (gbCgbMode)

   477 		{

   478 			c = c + (flags & 0x07)*4 + 32;

   479 		}

   480 		else

   481 		{

   482 			c = pal[c];

   483 

   484 			if (gbSgbMode && !gbCgbMode)

   485 			{

   486 				int dx = xxx >> 3;

   487 				int dy = y >> 3;

   488 

   489 				int palette = gbSgbATF[dy * 20 + dx];

   490 

   491 				if (c == 0)

   492 					palette = 0;

   493 

   494 				c = c + 4*palette;

   495 			}

   496 			else

   497 			{

   498 				c += 4;

   499 			}

   500 		}

   501 

   502 		gbLineMix[xxx] = gbColorOption ? gbColorFilter[gbPalette[c]] :

   503 		                 gbPalette[c];

   504 	}

   505 }

   506 

   507 void gbDrawSprites()

   508 {

   509 	int x     = 0;

   510 	int y     = 0;

   511 	int count = 0;

   512 

   513 	int size = (register_LCDC & 4);

   514 

   515 	if (!(register_LCDC & 0x80))

   516 		return;

   517 

   518 	if ((register_LCDC & 2) && (layerSettings & 0x1000))

   519 	{

   520 		int yc = register_LY;

   521 

   522 		int address = 0xfe00;

   523 		for (int i = 0; i < 40; i++)

   524 		{

   525 			y = gbMemory[address++];

   526 			x = gbMemory[address++];

   527 			int tile = gbMemory[address++];

   528 			if (size)

   529 				tile &= 254;

   530 			int flags = gbMemory[address++];

   531 

   532 			if (x > 0 && y > 0 && x < 168 && y < 160)

   533 			{

   534 				// check if sprite intersects current line

   535 				int t = yc -y + 16;

   536 				if (size && t >= 0 && t < 16)

   537 				{

   538 					gbDrawSpriteTile(tile, x-8, yc, t, flags, size, i);

   539 					count++;

   540 				}

   541 				else if (!size && t >= 0 && t < 8)

   542 				{

   543 					gbDrawSpriteTile(tile, x-8, yc, t, flags, size, i);

   544 					count++;

   545 				}

   546 			}

   547 			// sprite limit reached!

   548 			if (count >= 10)

   549 				break;

   550 		}

   551 	}

   552 }
author	Robert McIntyre <rlm@mit.edu>
date	Sun, 04 Mar 2012 22:32:01 -0600
parents	f9f4f1b99eed
children