ppu.c 32 KB

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  1. /*
  2. * PPU emulation - The TI-NESulator Project
  3. * ppu.c
  4. *
  5. * Define and emulate the PPU (Picture Processing Unit) of the real NES
  6. *
  7. * Created by Manoel TRAPIER.
  8. * Copyright (c) 2003-2007 986Corp. All rights reserved.
  9. *
  10. * $LastChangedDate: 2007-05-31 18:02:16 +0200 (jeu, 31 mai 2007) $
  11. * $Author: mtrapier $
  12. * $HeadURL: file:///media/HD6G/SVNROOT/trunk/TI-NESulator/src/ppu.c $
  13. * $Revision: 58 $
  14. *
  15. */
  16. #include <allegro.h>
  17. #include <stdio.h>
  18. #include <stdlib.h>
  19. #define __TINES_PPU_INTERNAL__
  20. #include <ppu/ppu.h>
  21. #include <ppu/ppu.memory.h>
  22. #include <ppu/ppu.debug.h>
  23. #include <memory/manager.h>
  24. #define __TINES_PLUGINS__
  25. #include <plugins/manager.h>
  26. #if ISPAL && !ISNTSC
  27. //#define VBLANK_TIME 70
  28. extern int VBLANK_TIME;
  29. #elif !ISPAL && ISNTSC
  30. //#define VBLANK_TIME 20
  31. extern int VBLANK_TIME;
  32. #else
  33. #error Cannot use ISPAL with ISNTSC together !
  34. #endif
  35. #ifdef NO_N_KEY
  36. #define IF_N_KEY if (!key[KEY_N])
  37. #else
  38. #define IF_N_KEY if (key[KEY_N])
  39. #endif
  40. extern BITMAP *Buffer;
  41. volatile extern int frame;
  42. volatile extern unsigned long IPS, FPS;
  43. extern unsigned long ColorPalette[ 9 * 63 ];
  44. extern short IRQScanHit;
  45. BITMAP *VideoBuffer; /* The ppu will only write pixel to this, and then bliting
  46. this on the screen "surface" */
  47. /* PPU sprite sorted by scanline */
  48. /* Work as follow:
  49. 3322 2222 2222 1111 1111 1100 0000 0000
  50. 1098 7654 3210 9876 5432 1098 7654 3210
  51. ---------------------------------------
  52. AAAA AAAA TTTT TTTT xxxx XXXX YYYY YYYY
  53. ---------------------------------------
  54. 8421 8421 8421 8421 8421 8421 8421 8421
  55. A = Sprite Attributes
  56. x = reserved
  57. T = Tile ID
  58. X = X relative position
  59. Y = Y absolute position
  60. x = for future use
  61. */
  62. unsigned long PPU_SpriteByScanLine[241][9]; /* There is 240 scanline and 8 sprite per scanline */
  63. unsigned long PPU_NbSpriteByScanLine[241]; /* There is 240 scanline and 8 sprite per scanline */
  64. unsigned long PPU_NbSpriteByScanLineOverFlow[241]; /* There is 240 scanline and 8 sprite per scanline */
  65. #define PPU_SCANLINESPRITE_GET_ATTRS(sprt) (((sprt)&0xFF000000) >> 24)
  66. #define PPU_SCANLINESPRITE_GET_TILIDX(sprt) (((sprt)&0x00FF0000) >> 16)
  67. #define PPU_SCANLINESPRITE_GET_RELY(sprt) (((sprt)&0x00000F00) >> 8)
  68. #define PPU_SCANLINESPRITE_GET_X(sprt) ((sprt)&0x000000FF)
  69. #define PPU_SCANLINESPRITE_SET_ATTRS(sprt, v) sprt = (((sprt)&0x00FFFFFF) | (( (v) & 0xFF) << 24))
  70. #define PPU_SCANLINESPRITE_SET_TILIDX(sprt, v) sprt = (((sprt)&0xFF00FFFF) | (( (v) & 0xFF) << 16))
  71. #define PPU_SCANLINESPRITE_SET_RELY(sprt, v) sprt = (((sprt)&0xFFFFF0FF) | (( (v) & 0x0F) << 8))
  72. #define PPU_SCANLINESPRITE_SET_X(sprt, v) sprt = (((sprt)&0xFFFFFF00) | ( (v) & 0xFF ))
  73. /* PPU registers */
  74. /* NT: Name Table */
  75. byte PPU_Reg_NT;
  76. /* AT: Attribute/Color Table */
  77. byte PPU_Reg_AT;
  78. /* FV: Fine Vertical Scroll latch/counter */
  79. byte PPU_Reg_FV;
  80. /* HV: Fine Horizontal Scroll latch/counter */
  81. byte PPU_Reg_FH;
  82. /* VT: Vertical Tile indev latch/counter */
  83. byte PPU_Reg_VT;
  84. /* HT: Horizontal Tile indev latch/counter */
  85. byte PPU_Reg_HT;
  86. /* V: Vertical Name Table Selection latch/counter */
  87. byte PPU_Reg_V;
  88. /* H: Horizontal Name Table Selection latch/counter */
  89. byte PPU_Reg_H;
  90. /* S: Playfield pattern table selection latch */
  91. unsigned short PPU_Reg_S;
  92. /* PAR: Picture Address Register */
  93. byte PPU_Reg_PAR;
  94. /* AR: Tile Attribute (palette select) value latch */
  95. byte PPU_Reg_AR;
  96. unsigned short PPU_Reg_Counter;
  97. /* PPU Memory Areas */
  98. byte *ppu_mem_nameTables;
  99. byte *ppu_mem_patternTables;
  100. byte *ppu_mem_paletteValues;
  101. byte ppu_mem_spritesTable[0x100];
  102. byte ppu_mem_sptrTablePtr;
  103. /* Some other PPU "registers" */
  104. byte ppu_VramAccessFlipFlop;
  105. byte ppu_inVBlankTime;
  106. byte ppu_spriteZeroHit;
  107. byte ppu_scanlineSpriteOverflow;
  108. byte ppu_bgColor;
  109. /* CR #1 variables */
  110. unsigned short ppu_spritePatternTable;
  111. byte ppu_spriteSize;
  112. byte ppu_addrIncrement;
  113. byte ppu_execNMIonVBlank;
  114. /* CR #2 variables */
  115. byte ppu_spriteVisibility;
  116. byte ppu_backgroundVisibility;
  117. byte ppu_spriteClipping;
  118. byte ppu_backgroundClipping;
  119. byte ppu_displayType;
  120. byte ppu_mirrorMode;
  121. byte ppu_singleScreenMode;
  122. byte ppu_screenMode;
  123. #define PPU_MEM_PATTERNTABLES_SIZE 0x2000
  124. #define PPU_MEM_NAMETABLE_SIZE 0x1000
  125. #define PPU_MEM_PALETTEVALUES_SIZE 0x100 /* in fact its 20 but we must allocate a least one page */
  126. #define PPU_SPRITE_FLAGS_VFLIP ( 1 << 7 )
  127. #define PPU_SPRITE_FLAGS_HFLIP ( 1 << 6 )
  128. #define PPU_SPRITE_FLAGS_BGPRIO ( 1 << 5 )
  129. #define PPU_SPRITE_FLAGS_UPPERCOLOR ( 0x03 )
  130. #define PPU_FLAG_SR_VBLANK ( 1 << 7 )
  131. #define PPU_FLAG_SR_SPRT0 ( 1 << 6 )
  132. #define PPU_FLAG_SR_8SPRT ( 1 << 5 )
  133. #define PPU_FLAG_SR_RDWRALLOW ( 1 << 4 )
  134. #define PPU_CR1_SPRTSIZE ( 1 << 5 )
  135. #define PPU_CR1_EXECNMI ( 1 << 7 )
  136. #define PPU_CR2_BGVISIBILITY ( 1 << 3 )
  137. #define PPU_CR2_SPRTVISIBILITY ( 1 << 4 )
  138. int ppu_init()
  139. {
  140. int i;
  141. if (ppu_initMemory())
  142. return -1;
  143. /* Set ppu memory parameters */
  144. /* First: Allocate each memory zone */
  145. ppu_mem_patternTables = (byte*) malloc(PPU_MEM_PATTERNTABLES_SIZE);
  146. if (!ppu_mem_patternTables)
  147. return -1;
  148. ppu_mem_nameTables = (byte*) malloc(PPU_MEM_NAMETABLE_SIZE);
  149. if (!ppu_mem_nameTables)
  150. return -1;
  151. ppu_mem_paletteValues = (byte*) malloc(PPU_MEM_PALETTEVALUES_SIZE);
  152. if (!ppu_mem_paletteValues)
  153. return -1;
  154. printf("ppu_mem_nameTables :%p\n"
  155. "ppu_mem_patternTables:%p\n"
  156. "ppu_mem_paletteValues:%p\n",
  157. ppu_mem_nameTables,
  158. ppu_mem_patternTables,
  159. ppu_mem_paletteValues);
  160. /* Second: make the ppu memory manager point on the memory zones */
  161. ppu_setPagePtr8k(0x00, ppu_mem_patternTables);
  162. ppu_setPagePtr4k(0x20, ppu_mem_nameTables);
  163. ppu_setPagePtr (0x3F, ppu_mem_paletteValues);
  164. for ( i = 0x00; i < 0x0F; i++ )
  165. ppu_setPageGhost(0x30 + i, true, 0x20 + i);
  166. /* Third: set registers to defaults */
  167. /* Now test the memory ! */
  168. /* Fille PPU memory with garbage */
  169. for (i = 0x0000; i < 0x2000 ; i++)
  170. ppu_mem_patternTables[i] = rand()%0xFF;
  171. for (i = 0x0000; i < 0x1000 ; i++)
  172. ppu_mem_nameTables[i] = rand()%0xFF;
  173. for (i = 0x0000; i < 0x001F ; i++)
  174. ppu_mem_paletteValues[i] = rand()%0xFF;
  175. /* Dump PPU memory state */
  176. //ppu_memoryDumpState(stdout);
  177. /* Set some other variables */
  178. ppu_VramAccessFlipFlop = 0;
  179. ppu_addrIncrement = 1;
  180. ppu_spritePatternTable = 0;
  181. ppu_spriteSize = 8;
  182. ppu_execNMIonVBlank = 0;
  183. ppu_spriteVisibility = 0;
  184. ppu_backgroundVisibility = 0;
  185. ppu_spriteClipping = 0;
  186. ppu_backgroundClipping = 0;
  187. ppu_displayType = 0;
  188. ppu_inVBlankTime = 0;
  189. ppu_bgColor = 0;
  190. /* Set PPU registers on CPU side */
  191. set_page_rd_hook(0x20, ppu_readReg);
  192. set_page_wr_hook(0x20, ppu_writeReg);
  193. set_page_readable(0x20, true);
  194. set_page_writeable(0x20, true);
  195. /* Set PPU Ghost Registers */
  196. for(i = 0x21; i < 0x40; i++)
  197. set_page_ghost(i, true, 0x20);
  198. // plugin_install_keypressHandler('i', ppu_debugSprites);
  199. // plugin_install_keypressHandler('I', ppu_debugSprites);
  200. // plugin_install_keypressHandler('u', ppu_debugColor);
  201. // plugin_install_keypressHandler('U', ppu_debugColor);
  202. /* allocate the PPU Video memory */
  203. VideoBuffer = create_bitmap(256, 240);
  204. if (VideoBuffer == NULL)
  205. return -1;
  206. return 0;
  207. }
  208. void ppu_updateSpriteScanlineTable()
  209. {
  210. int i, line, j, k;
  211. volatile int sprite_x, sprite_y, sprite_idx, sprite_attr;
  212. int curline;
  213. for (line = 0; line < 241; line ++)
  214. {
  215. PPU_NbSpriteByScanLine[line] = 0;
  216. PPU_NbSpriteByScanLineOverFlow[line] = 0;
  217. for (i = 0; i < 9; i++)
  218. PPU_SpriteByScanLine[line][i] = 0xFFFFFFFF;
  219. }
  220. for ( i = 0; i < 64; i ++)
  221. {
  222. /* Fill sprite_zzz variables */
  223. sprite_y = ppu_mem_spritesTable[(i*4) + 0];
  224. sprite_idx = ppu_mem_spritesTable[(i*4) + 1];
  225. sprite_attr = ppu_mem_spritesTable[(i*4) + 2] | ((i==0)?0x04:0); /* Add a flag for the sprite #0 */
  226. sprite_x = ppu_mem_spritesTable[(i*4) + 3];
  227. /* For each line covered by the sprite */
  228. for (line = 0; line < ppu_spriteSize; line ++)
  229. {
  230. curline = line + sprite_y;
  231. if ((curline < 0) || (curline > 240))
  232. continue; /* Don't go beyond, this sprite go beyond the borders */
  233. if (PPU_NbSpriteByScanLine[curline] < 7)
  234. PPU_NbSpriteByScanLine[curline] ++;
  235. else
  236. {
  237. PPU_NbSpriteByScanLineOverFlow[curline] = 1;
  238. //printf("sprite of: %d - %d\n", curline, PPU_NbSpriteByScanLine[curline]);
  239. continue; /* We have 8 sprite in this line, don't continue */
  240. }
  241. if (((sprite_x+8) < 0) && ((sprite_x-8) > 256))
  242. continue; /* this sprite isn't either displayable */
  243. /* Now test if this sprite can be put in the sprite list */
  244. for (j = 0; j <= PPU_NbSpriteByScanLine[curline]; j++)
  245. {
  246. /* sprite are ordered by their y value, so, the first time that
  247. we have lower y value is where we need to put the sprite */
  248. if (sprite_x < PPU_SCANLINESPRITE_GET_X(PPU_SpriteByScanLine[curline][j]))
  249. {
  250. /* move the j eme item and next to the right in the list, trashing
  251. if needed the rightest item. */
  252. for (k = 7; k >= j; k--)
  253. PPU_SpriteByScanLine[curline][k] = PPU_SpriteByScanLine[curline][k-1];
  254. PPU_SpriteByScanLine[curline][j] = 0;
  255. PPU_SCANLINESPRITE_SET_ATTRS (PPU_SpriteByScanLine[curline][j], sprite_attr);
  256. //printf("new sprite [%02X:%02X:%02X:%02X] at sl:%d : 0x%08X ",
  257. //sprite_attr, sprite_idx, curline - sprite_x, sprite_y,
  258. //curline, PPU_SpriteByScanLine[curline][j]);
  259. PPU_SCANLINESPRITE_SET_TILIDX(PPU_SpriteByScanLine[curline][j], sprite_idx);
  260. //printf("- 0x%08X ", PPU_SpriteByScanLine[curline][j]);
  261. PPU_SCANLINESPRITE_SET_RELY (PPU_SpriteByScanLine[curline][j], curline - sprite_y);
  262. //printf("- 0x%08X ", PPU_SpriteByScanLine[curline][j]);
  263. PPU_SCANLINESPRITE_SET_X (PPU_SpriteByScanLine[curline][j], sprite_x);
  264. //printf("- 0x%08X\n", PPU_SpriteByScanLine[curline][j]);
  265. break; /* Stop the for, we don't need to go further in the line list */
  266. }
  267. }
  268. }
  269. }
  270. }
  271. void ppu_setMirroring(byte direction)
  272. {
  273. if (ppu_screenMode != PPU_SCMODE_NORMAL)
  274. return;
  275. if (ppu_mirrorMode == direction)
  276. return; /* Same value, no need to change! */
  277. switch(direction)
  278. {
  279. default:
  280. direction = PPU_MIRROR_HORIZTAL;
  281. ppu_mirrorMode = direction;
  282. case PPU_MIRROR_HORIZTAL: /* Horizontal */
  283. //printf("Set mirror to Hor\n");
  284. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0x000);
  285. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0x000);
  286. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0x400);
  287. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0x400);
  288. break;
  289. case PPU_MIRROR_VERTICAL: /* Vertical */
  290. //printf("Set mirror to Ver\n");
  291. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0x000);
  292. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0x400);
  293. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0x000);
  294. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0x400);
  295. break;
  296. }
  297. ppu_mirrorMode = direction;
  298. }
  299. void ppu_setSingleScreen(byte screen)
  300. {
  301. if (ppu_screenMode != PPU_SCMODE_SINGLE)
  302. return;
  303. if (ppu_singleScreenMode == screen)
  304. return; /* Same value, no need to change! */
  305. switch(screen)
  306. {
  307. default:
  308. screen = PPU_SCREEN_000;
  309. ppu_singleScreenMode = screen;
  310. case PPU_SCREEN_000: /* 0x2000 */
  311. //printf("Set screen to 0x000\n");
  312. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0x000);
  313. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0x000);
  314. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0x000);
  315. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0x000);
  316. break;
  317. case PPU_SCREEN_400: /* 0x2400 */
  318. //printf("Set screen to 0x400\n");
  319. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0x400);
  320. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0x400);
  321. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0x400);
  322. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0x400);
  323. break;
  324. case PPU_SCREEN_800: /* 0x2800 */
  325. //printf("Set screen to 0x800\n");
  326. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0x800);
  327. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0x800);
  328. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0x800);
  329. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0x800);
  330. break;
  331. case PPU_SCREEN_C00: /* 0x2C00 */
  332. //printf("Set screen to 0xC00\n");
  333. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0xC00);
  334. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0xC00);
  335. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0xC00);
  336. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0xC00);
  337. break;
  338. }
  339. ppu_singleScreenMode = screen;
  340. }
  341. /* Let set display to
  342. Single screen (1 NT with mirroring)
  343. Normal screen (2 NT with mirroring)
  344. Four screen (4 NT without mirroring) */
  345. void ppu_setScreenMode(byte mode)
  346. {
  347. if (ppu_screenMode == mode)
  348. return; /* Same value, no need to change! */
  349. ppu_screenMode = mode;
  350. switch(mode)
  351. {
  352. case PPU_SCMODE_SINGLE: /* Single screen (1 NT with mirroring) */
  353. //printf("Set Single Screen\n");
  354. ppu_setSingleScreen(~ppu_singleScreenMode);
  355. break;
  356. default:
  357. mode = PPU_SCMODE_NORMAL;
  358. ppu_screenMode = mode;
  359. case PPU_SCMODE_NORMAL: /* Normal screen (2 NT with mirroring) */
  360. //printf("Set Normal Screen\n");
  361. ppu_setMirroring(~ppu_mirrorMode);
  362. break;
  363. case PPU_SCMODE_FOURSC: /* Four screen (4 NT withou mirroring) */
  364. //printf("Set Four Screen\n");
  365. ppu_setPagePtr1k(0x20, ppu_mem_nameTables + 0x000);
  366. ppu_setPagePtr1k(0x24, ppu_mem_nameTables + 0x400);
  367. ppu_setPagePtr1k(0x28, ppu_mem_nameTables + 0x800);
  368. ppu_setPagePtr1k(0x2C, ppu_mem_nameTables + 0xC00);
  369. break;
  370. }
  371. }
  372. void ppu_setSprite(unsigned short i, PPU_Sprite *sprt)
  373. {
  374. }
  375. /* update whole counters */
  376. void ppu_updateCounters()
  377. {
  378. /*
  379. +---------------+-----------------------------------------------+
  380. | |+===++=++=++=====++=====++===++=++========++==+|
  381. |PPU registers || FV||V||H|| VT|| HT|| FH||S|| PAR||AR||
  382. |PPU counters |+---++-++-++-----++-----++===++=++========++==+|
  383. | |+===++=++=++=====++=====+ |
  384. +---------------+-----------------------------------------------+
  385. |2007 access | DC B A 98765 43210 |
  386. +===============+===============================================+
  387. 8421 8421 8421 8421
  388. -------------------
  389. 1111 1100 0000 0000
  390. 5432 1098 7654 3210
  391. _AAA BCDD DDDE EEEE
  392. */
  393. PPU_Reg_Counter = (PPU_Reg_FV & 0x07) << 12;
  394. PPU_Reg_Counter |= PPU_Reg_V << 11;
  395. PPU_Reg_Counter |= PPU_Reg_H << 10;
  396. PPU_Reg_Counter |= PPU_Reg_VT << 5;
  397. PPU_Reg_Counter |= PPU_Reg_HT;
  398. IF_N_KEY printf("Counter update to %04X\n",PPU_Reg_Counter);
  399. }
  400. int ppu_hblank(int scanline)
  401. {
  402. int i, j;
  403. byte pixelColor = 0x42;
  404. byte Color = 0x42;
  405. unsigned short addr;
  406. byte value;
  407. unsigned short tmp_HHT = 0;
  408. unsigned short tmp_VVTFV = 0;
  409. /* If no plan activated, we have nothing to do ! */
  410. if (scanline == 0)
  411. {
  412. ppu_bgColor = ppu_readMemory(0x3F,00);
  413. clear_to_color(VideoBuffer, ppu_bgColor);
  414. if ((ppu_spriteVisibility != 0) || (ppu_backgroundVisibility != 0))
  415. ppu_updateCounters();
  416. }
  417. if (scanline < 240)
  418. {
  419. /* For each PPU pixel of this scanline */
  420. for (i = 0; i < 256; i ++)
  421. {
  422. /* determine which from sprite bg, bg and sprite fg is in the front */
  423. pixelColor = ppu_readMemory(0x3F,00);
  424. /* is there sprite(s) on this line ? */
  425. /* */
  426. /* Didn't display sprite for now, juste the BG */
  427. /* Read NameTable */
  428. if (ppu_backgroundVisibility == 1)
  429. {
  430. /*
  431. xxxx AABB BxxC CCxx
  432. xxxx AA11 11BB BCCC
  433. */
  434. /*
  435. s:32 i:235 cnt:089D addr:0BCF cba:0 addr:0000
  436. 0000 BBBB CCCC FFFF
  437. 0000 1100 1101 1111
  438. AABB B C CC
  439. BA98 7654 3210
  440. xxxx 1111 1100 1111
  441. FFFF CCCC FFFF
  442. */
  443. addr = (PPU_Reg_Counter & 0x0C00);
  444. addr = addr | 0x03C0;
  445. addr |= (PPU_Reg_Counter >> 4 ) & 0x0038;
  446. addr |= (PPU_Reg_Counter >> 2 ) & 0x0007;
  447. PPU_Reg_AR = ppu_readMemory(0x20 | ((addr>>8) & 0x0F), addr& 0xFF);
  448. PPU_Reg_AR = PPU_Reg_AR >> (((PPU_Reg_Counter >> 4 ) & 0x04)|((PPU_Reg_Counter ) & 0x02));
  449. PPU_Reg_AR = (PPU_Reg_AR<<2) & 0x0C;
  450. PPU_Reg_PAR = ppu_readMemory(0x20 | ((PPU_Reg_Counter>>8) & 0x0F), PPU_Reg_Counter& 0xFF);
  451. /* C BA98 7654 3210 */
  452. /* 1 8421 8421 8421 */
  453. addr = PPU_Reg_S;
  454. addr |= ((PPU_Reg_PAR & 0xFF) << 4);
  455. addr |= ((PPU_Reg_Counter >> 12) & 0x07);
  456. value = ppu_readMemory((addr >> 8) , addr );
  457. Color = (value & (1 << (7-(i + PPU_Reg_FH) % 8)))?0x01:0;
  458. value = ppu_readMemory((addr >> 8) , addr | 0x08 );
  459. Color |= (value & (1 << (7-(i + PPU_Reg_FH) % 8)))?0x02:0;
  460. if (Color > 0x00)
  461. {
  462. Color |= PPU_Reg_AR;
  463. Color &= 0x0F;
  464. pixelColor = ppu_readMemory(0x3F, Color);
  465. }
  466. if (((i + PPU_Reg_FH)%8) == 7)
  467. {
  468. tmp_HHT = ((PPU_Reg_Counter >> 5) & 0x0020) |
  469. (PPU_Reg_Counter & 0x001F);
  470. tmp_HHT = (tmp_HHT + 1) & 0x003F;
  471. /* Reassemble with HT & H */
  472. PPU_Reg_Counter = (PPU_Reg_Counter & 0xFBE0) |
  473. ((tmp_HHT & 0x0020) << 5) |
  474. (tmp_HHT & 0x001F);
  475. }
  476. }
  477. /* draw the pixel */
  478. _putpixel(VideoBuffer, i, scanline, pixelColor);
  479. }
  480. /* Increment only V & VT & FV*/
  481. /*
  482. 8421 8421 8421 8421
  483. -------------------
  484. 1111 1100 0000 0000
  485. 5432 1098 7654 3210
  486. _AAA BCDD DDDE EEEE
  487. xxx x xx xxx : vvtfv = 7BE0
  488. x x xxxx : hht
  489. B DDDD DAAA : vvtfv
  490. CE EEEE : hht
  491. A = FV
  492. B = V
  493. C = H
  494. D = VT
  495. E = HT
  496. */
  497. if (ppu_backgroundVisibility == 1)
  498. {
  499. tmp_VVTFV = ((PPU_Reg_Counter >> 3 ) & 0x0100) | /* V */
  500. ((PPU_Reg_Counter >> 2 ) & 0x00F8) | /* VT */
  501. ((PPU_Reg_Counter >> 12) & 0x0007); /* FV */
  502. //printf("counter:%04X vvtfv:%04X ", PPU_Reg_Counter, tmp_VVTFV);
  503. tmp_VVTFV++;
  504. //printf("__ vvtfv:0x%04X == 0x%04X ? ", tmp_VVTFV, 30<<3);
  505. if ((tmp_VVTFV&0x0F8) == 0xF0)
  506. {
  507. tmp_VVTFV &= ~0x0F8;
  508. tmp_VVTFV ^= 0x100;
  509. //printf("YES _");
  510. }
  511. //printf("vvtfv:%04X ", tmp_VVTFV);
  512. PPU_Reg_Counter = ( PPU_Reg_Counter & 0x041F) |
  513. ((tmp_VVTFV & 0x0100 ) << 3 ) | /* V */
  514. ((tmp_VVTFV & 0x00F8 ) << 2 ) | /* VT */
  515. ((tmp_VVTFV & 0x0007 ) << 12); /* FV */
  516. //printf("counter:%04X ", PPU_Reg_Counter);
  517. /* Update H & HT */
  518. PPU_Reg_Counter = (PPU_Reg_Counter & ~0x041F) |
  519. (PPU_Reg_H << 10) |
  520. PPU_Reg_HT;
  521. }
  522. if (PPU_NbSpriteByScanLine[scanline] != 0)
  523. {
  524. for (j = 0; j < PPU_NbSpriteByScanLine[scanline]; j++)
  525. {
  526. static byte i = 0;
  527. pixelColor = (i = (i+1)%4) | ((PPU_SCANLINESPRITE_GET_ATTRS(PPU_SpriteByScanLine[scanline][j]) << 2) & 0x0C);
  528. pixelColor = ppu_readMemory(0x3F, 0x10 + pixelColor);
  529. line(VideoBuffer,
  530. PPU_SCANLINESPRITE_GET_X(PPU_SpriteByScanLine[scanline][j]),
  531. scanline,
  532. PPU_SCANLINESPRITE_GET_X(PPU_SpriteByScanLine[scanline][j]) + 8,
  533. scanline, pixelColor
  534. );
  535. if (PPU_SCANLINESPRITE_GET_ATTRS(PPU_SpriteByScanLine[scanline][j]) & 0x04)
  536. {
  537. //printf("Hit!\n");
  538. ppu_spriteZeroHit = 1;
  539. }
  540. }
  541. }
  542. ppu_scanlineSpriteOverflow = 0;
  543. if (PPU_NbSpriteByScanLineOverFlow[scanline] == 1)
  544. ppu_scanlineSpriteOverflow = 1;
  545. }
  546. /* if (scanline == 100)
  547. ppu_spriteZeroHit = 1;*/
  548. if (scanline == 243)
  549. {
  550. ppu_inVBlankTime = 1;
  551. IF_N_KEY printf("============= enter vblank =================\n");
  552. return ppu_execNMIonVBlank;
  553. }
  554. if (key[KEY_B])
  555. {
  556. blit(VideoBuffer, Buffer, 0, 0, 0, 0, 256, 240);
  557. blit(Buffer, screen, 0, 0, 0, 0, 512 + 256, 480);
  558. }
  559. //if (scanline >= (241 + VBLANK_TIME))
  560. if (scanline >= 262)
  561. {
  562. //textprintf(Buffer, font, 5, 340, 4, "(SL:%d) FPS : %d IPS : %d", scanline, FPS, IPS);
  563. textprintf(screen, font, 260, 3, 4, "FPS : %d (CPU@~%2.2fMhz : %d%%)", FPS, (float) (((float) IPS) / 1000000.0), (int) ((((float) IPS) / 1770000.0) * 100.0));
  564. //printf("(SL:%d) FPS : %d IPS : %d\n", scanline, FPS, IPS);
  565. //ppu_dumpPalette(0, 241);
  566. //ppu_dumpPattern(280, 150);
  567. //ppu_dumpNameTable(256,0);
  568. //ppu_dumpAttributeTable(257, 0);
  569. //blit(VideoBuffer, Buffer, 0, 0, 0, 0, 256, 240);
  570. blit(VideoBuffer, screen, 0, 0, 0, 0, 256, 240);
  571. //blit(Buffer, screen, 0, 0, 0, 0, 512 + 256, 480);
  572. IF_N_KEY printf("_____________ leave vblank _________________\n");
  573. ppu_inVBlankTime = 0;
  574. ppu_spriteZeroHit = 0;
  575. //ppu_updateCounters();
  576. }
  577. return 0;
  578. }
  579. byte PPU_RegValues[8];
  580. byte ppu_readReg(byte id)
  581. {
  582. id &= 0x07;
  583. static byte garbage;
  584. static byte lastValue;
  585. switch(id)
  586. {
  587. default:
  588. garbage = PPU_RegValues[id];
  589. printf("%s: try to read 0x20%02X\n", __func__, id);
  590. break;
  591. case 0x02: /* PPU Status Register */
  592. /* Reset VRam 2005/2006 flipflop */
  593. ppu_VramAccessFlipFlop = 0;
  594. garbage = 0;
  595. garbage |= (ppu_inVBlankTime!=0) ?PPU_FLAG_SR_VBLANK:0;
  596. garbage |= (ppu_spriteZeroHit!=0) ?PPU_FLAG_SR_SPRT0:0;
  597. garbage |= (ppu_scanlineSpriteOverflow!=0)?PPU_FLAG_SR_8SPRT:0;
  598. /*garbage ^= PPU_FLAG_SR_RDWRALLOW;*/
  599. IF_N_KEY printf("%s() = %02X\n", __func__, garbage);
  600. ppu_inVBlankTime = 0;
  601. break;
  602. case 0x04: /* SPR-RAM I/O */
  603. garbage = ppu_mem_spritesTable[ppu_mem_sptrTablePtr];
  604. break;
  605. case 0x07: /* VRAM I/O */
  606. if (PPU_Reg_Counter < 0x3F00)
  607. {
  608. garbage = lastValue;
  609. lastValue = ppu_readMemory((PPU_Reg_Counter>>8) & 0x3F,
  610. PPU_Reg_Counter & 0xFF);
  611. }
  612. else
  613. {
  614. lastValue = ppu_readMemory( 0x2F,
  615. PPU_Reg_Counter & 0xFF);
  616. garbage = ppu_readMemory( 0x3F,
  617. PPU_Reg_Counter & 0xFF);
  618. }
  619. PPU_Reg_Counter += ppu_addrIncrement;
  620. break;
  621. }
  622. //printf("ppuread %02X return: %02X\n", id, garbage);
  623. return garbage;
  624. }
  625. void ppu_writeReg(byte id, byte val)
  626. {
  627. id &= 0x07;
  628. //printf("ppuwrte %02X val: %02X\n", id, val);
  629. PPU_RegValues[id] = val;
  630. switch(id)
  631. {
  632. default:
  633. printf("%s: try to write 0x%02X @ 0x20%02X\n", __func__, val, id);
  634. break;
  635. case 0x00: /* PPU Control Register #1 */
  636. /*
  637. +===============+===============================================+
  638. |2000 | 1 0 4 |
  639. +---------------+-----------------------------------------------+
  640. | |+===++=++=++=====++=====++===++=++========++==+|
  641. |PPU registers || FV||V||H|| VT|| HT|| FH||S|| PAR||AR||
  642. |PPU counters |+---++-++-++-----++-----++===++=++========++==+|
  643. | |+===++=++=++=====++=====+ |
  644. +---------------+-----------------------------------------------+
  645. */
  646. IF_N_KEY
  647. printf("%s(%02X, %02X); /* 2000: "
  648. "NMI:%c SPRTSIZE:%02d BGTA:%04X[0x%04X] SPTA:%04X INC:%02d NTA:%04X */\n"
  649. , __func__, id, val,
  650. (val & 0x80)?'E':'D',
  651. (val & 0x20)?16:8,
  652. (val & 0x10)?0x1000:0x0000, PPU_Reg_S,
  653. (val & 0x08)?0x1000:0x0000,
  654. (val & 0x04)?32:1,
  655. (val & 0x03)<<10|0x2000
  656. );
  657. /* Set PPU internal registers */
  658. PPU_Reg_V = (val & 0x02)?1:0;
  659. PPU_Reg_H = (val & 0x01)?1:0;
  660. PPU_Reg_S = (val & 0x10)?0x1000:0x0000;
  661. /* Set Other parameters */
  662. ppu_addrIncrement = (val & 0x04)?0x20:0x01;
  663. ppu_spritePatternTable = (val & 0x08)?0x1000:0;
  664. ppu_spriteSize = (val & 0x20)?16:8;
  665. ppu_execNMIonVBlank = (val & 0x80)?1:0;
  666. break;
  667. case 0x01: /* PPU Control Register #2 */
  668. ppu_spriteVisibility = (val & 0x10)?1:0;
  669. ppu_backgroundVisibility = (val & 0x08)?1:0;
  670. ppu_spriteClipping = (val & 0x04)?1:0;
  671. ppu_backgroundClipping = (val & 0x02)?1:0;
  672. ppu_displayType = (val & 0x01)?1:0;
  673. IF_N_KEY
  674. printf("%s(%02X, %02X); /* 2001 : "
  675. "SprtV:%c BckgV:%c SprtC:%c BckgC:%c DispT:%c"
  676. " */\n", __func__, id, val,
  677. ppu_spriteVisibility?'y':'n',
  678. ppu_backgroundVisibility?'y':'n',
  679. ppu_spriteClipping?'y':'n',
  680. ppu_backgroundClipping?'y':'n',
  681. ppu_displayType?'m':'c'
  682. );
  683. break;
  684. case 0x03: /* SPR-RAM Address Register */
  685. ppu_mem_sptrTablePtr = val;
  686. break;
  687. case 0x04: /* SPR-RAM I/O */
  688. ppu_mem_spritesTable[ppu_mem_sptrTablePtr++] = val;
  689. ppu_updateSpriteScanlineTable();
  690. break;
  691. case 0x05: /* 2005 VRAM Register */
  692. /*
  693. +===============+===============================================+
  694. |2005/1 | 76543 210 |
  695. |2005/2 | 210 76543 |
  696. +---------------+-----------------------------------------------+
  697. | |+===++=++=++=====++=====++===++=++========++==+|
  698. |PPU registers || FV||V||H|| VT|| HT|| FH||S|| PAR||AR||
  699. |PPU counters |+---++-++-++-----++-----++===++=++========++==+|
  700. | |+===++=++=++=====++=====+ |
  701. +---------------+-----------------------------------------------+
  702. */
  703. if (ppu_VramAccessFlipFlop == 0)
  704. {
  705. ppu_VramAccessFlipFlop = ~0;
  706. PPU_Reg_FH = val & 0x07;
  707. PPU_Reg_HT = (val & 0xF8) >> 3;
  708. IF_N_KEY
  709. printf("2005/1[%04X]: fv:%01X v:%01X h:%01X vt:%01X ht:%01X fh:%01X\n",val,PPU_Reg_FV,PPU_Reg_V,PPU_Reg_H,PPU_Reg_VT,PPU_Reg_HT,PPU_Reg_FH);
  710. }
  711. else
  712. {
  713. ppu_VramAccessFlipFlop = 0;
  714. PPU_Reg_FV = val & 0x07;
  715. PPU_Reg_VT = (val & 0xF8) >> 3;
  716. IF_N_KEY
  717. printf("2005/2[%04X]: fv:%01X v:%01X h:%01X vt:%01X ht:%01X fh:%01X\n",val,PPU_Reg_FV,PPU_Reg_V,PPU_Reg_H,PPU_Reg_VT,PPU_Reg_HT,PPU_Reg_FH);
  718. }
  719. break;
  720. case 0x06: /* 2006 VRAM Register */
  721. /*
  722. +===============+===============================================+
  723. |2006/1 | -54 3 2 10 |
  724. |2006/2 | 765 43210 |
  725. +---------------+-----------------------------------------------+
  726. | |+===++=++=++=====++=====++===++=++========++==+|
  727. |PPU registers || FV||V||H|| VT|| HT|| FH||S|| PAR||AR||
  728. |PPU counters |+---++-++-++-----++-----++===++=++========++==+|
  729. | |+===++=++=++=====++=====+ |
  730. +---------------+-----------------------------------------------+
  731. */
  732. if (ppu_VramAccessFlipFlop == 0)
  733. {
  734. ppu_VramAccessFlipFlop = ~0;
  735. PPU_Reg_FV = (val >> 4) & 0x03;
  736. PPU_Reg_V = (val >> 3) & 0x01;
  737. PPU_Reg_H = (val >> 2) & 0x01;
  738. PPU_Reg_VT = (PPU_Reg_VT & 0x07) | ((val & 0x03) << 3);
  739. IF_N_KEY
  740. printf("2006/1[%04X]: fv:%01X v:%01X h:%01X vt:%01X ht:%01X fh:%01X\n",val,PPU_Reg_FV,PPU_Reg_V,PPU_Reg_H,PPU_Reg_VT,PPU_Reg_HT,PPU_Reg_FH);
  741. }
  742. else
  743. {
  744. ppu_VramAccessFlipFlop = 0;
  745. PPU_Reg_VT = (PPU_Reg_VT & 0x18) | ((val >> 5) & 0x07);
  746. PPU_Reg_HT = val & 0x1F;
  747. IF_N_KEY
  748. printf("2006/2[%04X]: fv:%01X v:%01X h:%01X vt:%01X ht:%01X fh:%01X\n",val,PPU_Reg_FV,PPU_Reg_V,PPU_Reg_H,PPU_Reg_VT,PPU_Reg_HT,PPU_Reg_FH);
  749. ppu_updateCounters();
  750. }
  751. break;
  752. case 0x07: /* VRAM I/O */
  753. /*
  754. +---------------+-----------------------------------------------+
  755. | |+===++=++=++=====++=====++===++=++========++==+|
  756. |PPU registers || FV||V||H|| VT|| HT|| FH||S|| PAR||AR||
  757. |PPU counters |+---++-++-++-----++-----++===++=++========++==+|
  758. | |+===++=++=++=====++=====+ |
  759. +---------------+-----------------------------------------------+
  760. |2007 access | DC B A 98765 43210 |
  761. +===============+===============================================+
  762. */
  763. //if ( (PPU_Reg_Counter&0xFF00) == 0x3F00)
  764. //{
  765. // printf("fv:%01X v:%01X h:%01X vt:%01X ht:%01X fh:%01X\n",PPU_Reg_FV,PPU_Reg_V,PPU_Reg_H,PPU_Reg_VT,PPU_Reg_HT,PPU_Reg_FH);
  766. // printf("will write ppu: counter:%04X pa:%02X%02X v:%02X\n",
  767. // PPU_Reg_Counter, (PPU_Reg_Counter>>8) & 0x3F, PPU_Reg_Counter & 0xFF, val);
  768. // }
  769. ppu_writeMemory((PPU_Reg_Counter>>8) & 0x3F, PPU_Reg_Counter & 0xFF, val);
  770. IF_N_KEY
  771. {
  772. ppu_dumpPalette(0, 241);
  773. ppu_dumpPattern(280, 150);
  774. ppu_dumpNameTable(256,0);
  775. blit(Buffer, screen, 0, 0, 0, 0, 512 + 256, 480);
  776. }
  777. PPU_Reg_Counter += ppu_addrIncrement;
  778. break;
  779. }
  780. }
  781. void ppu_fillSprRamDMA(byte value)
  782. {
  783. short i;
  784. byte *ptr = get_page_ptr(value);
  785. for (i = 0; i < 0x100; i++)
  786. {
  787. ppu_mem_spritesTable[(ppu_mem_sptrTablePtr + i)&0xFF] = *(ptr+i);
  788. }
  789. //memcpy(ppu_mem_spritesTable, ptr, 0xFF);
  790. ppu_updateSpriteScanlineTable();
  791. }