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1.1 root 1: /*
2: * UAE - The Un*x Amiga Emulator
1.1.1.3 root 3: *
1.1 root 4: * Custom chip emulation
1.1.1.3 root 5: *
1.1 root 6: * (c) 1995 Bernd Schmidt, Alessandro Bissacco
7: */
8:
9: #include "sysconfig.h"
10: #include "sysdeps.h"
11:
12: #include "options.h"
13: #include "events.h"
1.1.1.3 root 14: #include "uae.h"
1.1 root 15: #include "memory.h"
16: #include "custom.h"
17: #include "newcpu.h"
18: #include "blitter.h"
19: #include "blit.h"
20:
1.1.1.10 root 21: uae_u16 oldvblts;
1.1.1.16! root 22: uae_u16 bltcon0, bltcon1;
! 23: uae_u32 bltapt, bltbpt, bltcpt, bltdpt;
1.1 root 24:
25: int blinea_shift;
1.1.1.16! root 26: static uae_u16 blinea, blineb;
! 27: static int blitline, blitfc, blitfill, blitife, blitsing, blitdesc;
! 28: static int blitonedot, blitsign;
1.1 root 29: static long int bltwait;
30:
31: struct bltinfo blt_info;
32:
1.1.1.3 root 33: static uae_u8 blit_filltable[256][4][2];
34: uae_u32 blit_masktable[BLITTER_MAX_WORDS];
1.1 root 35: enum blitter_states bltstate;
36:
1.1.1.14 root 37: static uae_u8 blit_cycle_diagram_start[][10] =
38: {
39: { 0, 1, 0 }, /* 0 */
40: { 0, 2, 4,0 }, /* 1 */
41: { 0, 2, 3,0 }, /* 2 */
42: { 2, 3, 3,0, 0,3,4 }, /* 3 */
43: { 0, 3, 2,0,0 }, /* 4 */
44: { 2, 3, 2,0, 0,2,4 }, /* 5 */
45: { 0, 3, 2,3,0 }, /* 6 */
46: { 3, 4, 2,3,0, 0,2,3,4 }, /* 7 */
47: { 0, 2, 1,0 }, /* 8 */
48: { 2, 2, 1,0, 1,4 }, /* 9 */
49: { 0, 2, 1,3 }, /* A */
50: { 3, 3, 1,3,0, 1,3,4 }, /* B */
51: { 2, 3, 1,2, 0,1,2 }, /* C */
52: { 3, 3, 1,2,0, 1,2,4 }, /* D */
53: { 0, 3, 1,2,3 }, /* E */
54: { 4, 4, 1,2,3,0, 1,2,3,4 } /* F */
55: };
56:
1.1.1.16! root 57: void build_blitfilltable (void)
1.1 root 58: {
59: unsigned int d, fillmask;
60: int i;
1.1.1.3 root 61:
1.1.1.2 root 62: for (i = 0; i < BLITTER_MAX_WORDS; i++)
63: blit_masktable[i] = 0xFFFF;
1.1.1.3 root 64:
1.1 root 65: for (d = 0; d < 256; d++) {
66: for (i = 0; i < 4; i++) {
67: int fc = i & 1;
1.1.1.3 root 68: uae_u8 data = d;
1.1 root 69: for (fillmask = 1; fillmask != 0x100; fillmask <<= 1) {
1.1.1.3 root 70: uae_u16 tmp = data;
1.1 root 71: if (fc) {
72: if (i & 2)
73: data |= fillmask;
74: else
75: data ^= fillmask;
76: }
77: if (tmp & fillmask) fc = !fc;
78: }
79: blit_filltable[d][i][0] = data;
80: blit_filltable[d][i][1] = fc;
81: }
82: }
83: }
84:
1.1.1.16! root 85: static void blitter_dofast (void)
1.1 root 86: {
87: int i,j;
1.1.1.7 root 88: uaecptr bltadatptr = 0, bltbdatptr = 0, bltcdatptr = 0, bltddatptr = 0;
1.1.1.3 root 89: uae_u8 mt = bltcon0 & 0xFF;
90:
1.1.1.2 root 91: blit_masktable[0] = blt_info.bltafwm;
92: blit_masktable[blt_info.hblitsize - 1] &= blt_info.bltalwm;
1.1.1.3 root 93:
1.1 root 94: if (bltcon0 & 0x800) {
1.1.1.7 root 95: bltadatptr = bltapt;
96: bltapt += (blt_info.hblitsize*2 + blt_info.bltamod)*blt_info.vblitsize;
1.1 root 97: }
98: if (bltcon0 & 0x400) {
1.1.1.7 root 99: bltbdatptr = bltbpt;
100: bltbpt += (blt_info.hblitsize*2 + blt_info.bltbmod)*blt_info.vblitsize;
1.1 root 101: }
102: if (bltcon0 & 0x200) {
1.1.1.7 root 103: bltcdatptr = bltcpt;
104: bltcpt += (blt_info.hblitsize*2 + blt_info.bltcmod)*blt_info.vblitsize;
1.1 root 105: }
106: if (bltcon0 & 0x100) {
1.1.1.7 root 107: bltddatptr = bltdpt;
108: bltdpt += (blt_info.hblitsize*2 + blt_info.bltdmod)*blt_info.vblitsize;
1.1 root 109: }
1.1.1.3 root 110:
111: if (blitfunc_dofast[mt] && !blitfill)
1.1.1.7 root 112: (*blitfunc_dofast[mt])(bltadatptr, bltbdatptr, bltcdatptr, bltddatptr, &blt_info);
1.1 root 113: else {
1.1.1.3 root 114: uae_u32 blitbhold = blt_info.bltbhold;
115: uae_u32 preva = 0, prevb = 0;
1.1.1.7 root 116: uaecptr dstp = 0;
1.1.1.16! root 117: int dodst = 0;
1.1.1.2 root 118:
1.1.1.11 root 119: /*if (!blitfill) write_log ("minterm %x not present\n",mt); */
1.1.1.3 root 120: for (j = 0; j < blt_info.vblitsize; j++) {
1.1 root 121: blitfc = !!(bltcon1 & 0x4);
122: for (i = 0; i < blt_info.hblitsize; i++) {
1.1.1.3 root 123: uae_u32 bltadat, blitahold;
1.1.1.7 root 124: if (bltadatptr) {
1.1.1.16! root 125: blt_info.bltadat = bltadat = chipmem_agnus_wget (bltadatptr);
1.1.1.7 root 126: bltadatptr += 2;
1.1.1.2 root 127: } else
128: bltadat = blt_info.bltadat;
129: bltadat &= blit_masktable[i];
1.1.1.3 root 130: blitahold = (((uae_u32)preva << 16) | bltadat) >> blt_info.blitashift;
1.1.1.2 root 131: preva = bltadat;
132:
1.1.1.7 root 133: if (bltbdatptr) {
1.1.1.16! root 134: uae_u16 bltbdat;
! 135: blt_info.bltbdat = bltbdat = chipmem_agnus_wget (bltbdatptr);
1.1.1.7 root 136: bltbdatptr += 2;
1.1.1.3 root 137: blitbhold = (((uae_u32)prevb << 16) | bltbdat) >> blt_info.blitbshift;
1.1.1.2 root 138: prevb = bltbdat;
139: }
1.1.1.7 root 140: if (bltcdatptr) {
1.1.1.16! root 141: blt_info.bltcdat = chipmem_agnus_wget (bltcdatptr);
1.1.1.7 root 142: bltcdatptr += 2;
1.1.1.2 root 143: }
1.1.1.16! root 144: if (dodst)
! 145: chipmem_agnus_wput (dstp, blt_info.bltddat);
1.1.1.7 root 146: blt_info.bltddat = blit_func (blitahold, blitbhold, blt_info.bltcdat, mt) & 0xFFFF;
1.1.1.3 root 147: if (blitfill) {
148: uae_u16 d = blt_info.bltddat;
1.1 root 149: int ifemode = blitife ? 2 : 0;
150: int fc1 = blit_filltable[d & 255][ifemode + blitfc][1];
1.1.1.3 root 151: blt_info.bltddat = (blit_filltable[d & 255][ifemode + blitfc][0]
1.1 root 152: + (blit_filltable[d >> 8][ifemode + fc1][0] << 8));
153: blitfc = blit_filltable[d >> 8][ifemode + fc1][1];
154: }
1.1.1.7 root 155: if (blt_info.bltddat)
156: blt_info.blitzero = 0;
157: if (bltddatptr) {
1.1.1.16! root 158: dodst = 1;
1.1.1.7 root 159: dstp = bltddatptr;
160: bltddatptr += 2;
1.1.1.2 root 161: }
1.1 root 162: }
1.1.1.7 root 163: if (bltadatptr) bltadatptr += blt_info.bltamod;
164: if (bltbdatptr) bltbdatptr += blt_info.bltbmod;
165: if (bltcdatptr) bltcdatptr += blt_info.bltcmod;
166: if (bltddatptr) bltddatptr += blt_info.bltdmod;
1.1.1.3 root 167: }
1.1.1.16! root 168: if (dodst)
! 169: chipmem_agnus_wput (dstp, blt_info.bltddat);
1.1.1.2 root 170: blt_info.bltbhold = blitbhold;
1.1 root 171: }
1.1.1.2 root 172: blit_masktable[0] = 0xFFFF;
173: blit_masktable[blt_info.hblitsize - 1] = 0xFFFF;
1.1.1.3 root 174:
1.1 root 175: bltstate = BLT_done;
176: }
177:
1.1.1.16! root 178: static void blitter_dofast_desc (void)
1.1 root 179: {
180: int i,j;
1.1.1.7 root 181: uaecptr bltadatptr = 0, bltbdatptr = 0, bltcdatptr = 0, bltddatptr = 0;
1.1.1.3 root 182: uae_u8 mt = bltcon0 & 0xFF;
183:
1.1.1.2 root 184: blit_masktable[0] = blt_info.bltafwm;
185: blit_masktable[blt_info.hblitsize - 1] &= blt_info.bltalwm;
1.1.1.3 root 186:
1.1 root 187: if (bltcon0 & 0x800) {
1.1.1.7 root 188: bltadatptr = bltapt;
189: bltapt -= (blt_info.hblitsize*2 + blt_info.bltamod)*blt_info.vblitsize;
1.1 root 190: }
191: if (bltcon0 & 0x400) {
1.1.1.7 root 192: bltbdatptr = bltbpt;
193: bltbpt -= (blt_info.hblitsize*2 + blt_info.bltbmod)*blt_info.vblitsize;
1.1 root 194: }
195: if (bltcon0 & 0x200) {
1.1.1.7 root 196: bltcdatptr = bltcpt;
197: bltcpt -= (blt_info.hblitsize*2 + blt_info.bltcmod)*blt_info.vblitsize;
1.1 root 198: }
199: if (bltcon0 & 0x100) {
1.1.1.7 root 200: bltddatptr = bltdpt;
201: bltdpt -= (blt_info.hblitsize*2 + blt_info.bltdmod)*blt_info.vblitsize;
1.1 root 202: }
1.1.1.3 root 203: if (blitfunc_dofast_desc[mt] && !blitfill)
1.1.1.7 root 204: (*blitfunc_dofast_desc[mt])(bltadatptr, bltbdatptr, bltcdatptr, bltddatptr, &blt_info);
1.1 root 205: else {
1.1.1.3 root 206: uae_u32 blitbhold = blt_info.bltbhold;
207: uae_u32 preva = 0, prevb = 0;
1.1.1.7 root 208: uaecptr dstp = 0;
1.1.1.16! root 209: int dodst = 0;
1.1.1.2 root 210:
1.1.1.11 root 211: /* if (!blitfill) write_log ("minterm %x not present\n",mt);*/
1.1.1.3 root 212: for (j = 0; j < blt_info.vblitsize; j++) {
1.1 root 213: blitfc = !!(bltcon1 & 0x4);
214: for (i = 0; i < blt_info.hblitsize; i++) {
1.1.1.3 root 215: uae_u32 bltadat, blitahold;
1.1.1.7 root 216: if (bltadatptr) {
1.1.1.16! root 217: blt_info.bltadat = bltadat = chipmem_agnus_wget (bltadatptr);
1.1.1.7 root 218: bltadatptr -= 2;
1.1.1.2 root 219: } else
220: bltadat = blt_info.bltadat;
221: bltadat &= blit_masktable[i];
1.1.1.3 root 222: blitahold = (((uae_u32)bltadat << 16) | preva) >> blt_info.blitdownashift;
1.1.1.2 root 223: preva = bltadat;
1.1.1.7 root 224: if (bltbdatptr) {
1.1.1.16! root 225: uae_u16 bltbdat;
! 226: blt_info.bltbdat = bltbdat = chipmem_agnus_wget (bltbdatptr);
1.1.1.7 root 227: bltbdatptr -= 2;
1.1.1.3 root 228: blitbhold = (((uae_u32)bltbdat << 16) | prevb) >> blt_info.blitdownbshift;
1.1.1.2 root 229: prevb = bltbdat;
230: }
1.1.1.7 root 231: if (bltcdatptr) {
1.1.1.16! root 232: blt_info.bltcdat = chipmem_agnus_wget (bltcdatptr);
1.1.1.7 root 233: bltcdatptr -= 2;
1.1.1.2 root 234: }
1.1.1.16! root 235: if (dodst)
! 236: chipmem_agnus_wput (dstp, blt_info.bltddat);
1.1.1.7 root 237: blt_info.bltddat = blit_func (blitahold, blitbhold, blt_info.bltcdat, mt) & 0xFFFF;
1.1.1.3 root 238: if (blitfill) {
239: uae_u16 d = blt_info.bltddat;
1.1 root 240: int ifemode = blitife ? 2 : 0;
241: int fc1 = blit_filltable[d & 255][ifemode + blitfc][1];
242: blt_info.bltddat = (blit_filltable[d & 255][ifemode + blitfc][0]
243: + (blit_filltable[d >> 8][ifemode + fc1][0] << 8));
244: blitfc = blit_filltable[d >> 8][ifemode + fc1][1];
245: }
1.1.1.7 root 246: if (blt_info.bltddat)
247: blt_info.blitzero = 0;
248: if (bltddatptr) {
1.1.1.16! root 249: dodst = 1;
1.1.1.7 root 250: dstp = bltddatptr;
251: bltddatptr -= 2;
1.1.1.2 root 252: }
1.1 root 253: }
1.1.1.7 root 254: if (bltadatptr) bltadatptr -= blt_info.bltamod;
255: if (bltbdatptr) bltbdatptr -= blt_info.bltbmod;
256: if (bltcdatptr) bltcdatptr -= blt_info.bltcmod;
257: if (bltddatptr) bltddatptr -= blt_info.bltdmod;
1.1.1.3 root 258: }
1.1.1.16! root 259: if (dodst)
! 260: chipmem_agnus_wput (dstp, blt_info.bltddat);
1.1.1.2 root 261: blt_info.bltbhold = blitbhold;
1.1 root 262: }
1.1.1.2 root 263: blit_masktable[0] = 0xFFFF;
264: blit_masktable[blt_info.hblitsize - 1] = 0xFFFF;
265:
1.1 root 266: bltstate = BLT_done;
267: }
268:
1.1.1.16! root 269: STATIC_INLINE void blitter_read (void)
1.1 root 270: {
1.1.1.16! root 271: if (bltcon0 & 0x200) {
! 272: if (!dmaen (DMA_BLITTER))
! 273: return;
! 274: blt_info.bltcdat = chipmem_bank.wget (bltcpt);
1.1 root 275: }
276: bltstate = BLT_work;
277: }
278:
1.1.1.16! root 279: STATIC_INLINE void blitter_write (void)
1.1 root 280: {
1.1.1.16! root 281: if (blt_info.bltddat)
! 282: blt_info.blitzero = 0;
! 283: /* D-channel state has no effect on linedraw, but C must be enabled or nothing is drawn! */
! 284: if (bltcon0 & 0x200) {
! 285: if (!dmaen (DMA_BLITTER))
! 286: return;
! 287: chipmem_agnus_wput (bltdpt, blt_info.bltddat);
1.1 root 288: }
289: bltstate = BLT_next;
290: }
291:
1.1.1.16! root 292: STATIC_INLINE void blitter_line_incx (void)
1.1 root 293: {
294: if (++blinea_shift == 16) {
295: blinea_shift = 0;
1.1.1.16! root 296: bltcpt += 2;
1.1 root 297: }
298: }
299:
1.1.1.16! root 300: STATIC_INLINE void blitter_line_decx (void)
1.1 root 301: {
302: if (blinea_shift-- == 0) {
303: blinea_shift = 15;
1.1.1.16! root 304: bltcpt -= 2;
1.1 root 305: }
306: }
307:
1.1.1.16! root 308: STATIC_INLINE void blitter_line_decy (void)
1.1 root 309: {
1.1.1.16! root 310: bltcpt -= blt_info.bltcmod;
1.1 root 311: blitonedot = 0;
312: }
313:
1.1.1.16! root 314: STATIC_INLINE void blitter_line_incy (void)
1.1 root 315: {
1.1.1.16! root 316: bltcpt += blt_info.bltcmod;
1.1 root 317: blitonedot = 0;
318: }
319:
1.1.1.16! root 320: static void blitter_line (void)
1.1 root 321: {
1.1.1.16! root 322: uae_u16 blitahold = (blinea & blt_info.bltafwm) >> blinea_shift;
1.1.1.14 root 323: uae_u16 blitbhold = blineb & 1 ? 0xFFFF : 0;
324: uae_u16 blitchold = blt_info.bltcdat;
1.1.1.3 root 325:
1.1.1.15 root 326: if (blitsing && blitonedot)
327: blitahold = 0;
1.1 root 328: blitonedot = 1;
1.1.1.16! root 329: blt_info.bltddat = blit_func (blitahold, blitbhold, blitchold, bltcon0 & 0xFF);
! 330: if (!blitsign) {
! 331: if (bltcon0 & 0x800)
! 332: bltapt += (uae_s16)blt_info.bltamod;
! 333: if (bltcon1 & 0x10) {
1.1 root 334: if (bltcon1 & 0x8)
1.1.1.16! root 335: blitter_line_decy ();
1.1 root 336: else
1.1.1.16! root 337: blitter_line_incy ();
1.1 root 338: } else {
339: if (bltcon1 & 0x8)
1.1.1.16! root 340: blitter_line_decx ();
1.1.1.3 root 341: else
1.1.1.16! root 342: blitter_line_incx ();
1.1 root 343: }
344: } else {
1.1.1.16! root 345: if (bltcon0 & 0x800)
! 346: bltapt += (uae_s16)blt_info.bltbmod;
1.1 root 347: }
1.1.1.16! root 348: if (bltcon1 & 0x10) {
1.1 root 349: if (bltcon1 & 0x4)
1.1.1.16! root 350: blitter_line_decx ();
1.1 root 351: else
1.1.1.16! root 352: blitter_line_incx ();
1.1 root 353: } else {
354: if (bltcon1 & 0x4)
1.1.1.16! root 355: blitter_line_decy ();
1.1 root 356: else
1.1.1.16! root 357: blitter_line_incy ();
1.1 root 358: }
1.1.1.3 root 359: blitsign = 0 > (uae_s16)bltapt;
1.1 root 360: bltstate = BLT_write;
361: }
362:
1.1.1.16! root 363: STATIC_INLINE void blitter_nxline (void)
1.1 root 364: {
365: blineb = (blineb << 1) | (blineb >> 15);
1.1.1.16! root 366: blt_info.vblitsize--;
! 367: bltstate = BLT_read;
1.1 root 368: }
369:
1.1.1.16! root 370: static void blit_init (void)
1.1 root 371: {
1.1.1.3 root 372: blt_info.blitzero = 1;
1.1 root 373: blitline = bltcon1 & 1;
1.1.1.3 root 374: blt_info.blitashift = bltcon0 >> 12;
1.1.1.2 root 375: blt_info.blitdownashift = 16 - blt_info.blitashift;
376: blt_info.blitbshift = bltcon1 >> 12;
377: blt_info.blitdownbshift = 16 - blt_info.blitbshift;
1.1.1.3 root 378:
1.1 root 379: if (blitline) {
1.1.1.4 root 380: if (blt_info.hblitsize != 2)
381: write_log ("weird hblitsize in linemode: %d\n", blt_info.hblitsize);
382:
1.1 root 383: blitsing = bltcon1 & 0x2;
384: blinea = blt_info.bltadat;
385: blineb = (blt_info.bltbdat >> blt_info.blitbshift) | (blt_info.bltbdat << (16-blt_info.blitbshift));
386: #if 0
387: if (blineb != 0xFFFF && blineb != 0)
1.1.1.11 root 388: write_log ("%x %x %d %x\n", blineb, blt_info.bltbdat, blt_info.blitbshift, bltcon1);
1.1 root 389: #endif
1.1.1.3 root 390: blitsign = bltcon1 & 0x40;
1.1 root 391: blitonedot = 0;
392: } else {
393: blitfc = !!(bltcon1 & 0x4);
394: blitife = bltcon1 & 0x8;
395: blitfill = bltcon1 & 0x18;
396: if ((bltcon1 & 0x18) == 0x18) {
397: /* Digital "Trash" demo does this; others too. Apparently, no
398: * negative effects. */
399: static int warn = 1;
400: if (warn)
1.1.1.3 root 401: write_log ("warning: weird fill mode (further messages suppressed)\n");
1.1 root 402: warn = 0;
403: }
404: blitdesc = bltcon1 & 0x2;
1.1.1.7 root 405: if (blitfill && !blitdesc) {
406: static int warn = 1;
407: if (warn)
1.1.1.13 root 408: write_log ("warning: blitter fill without desc (further messages suppressed)\n");
1.1.1.7 root 409: warn = 0;
410: }
1.1 root 411: }
412: }
413:
1.1.1.16! root 414: static void actually_do_blit (void)
1.1 root 415: {
416: if (blitline) {
417: do {
1.1.1.16! root 418: blitter_read ();
! 419: blitter_line ();
! 420: blitter_write ();
! 421: bltdpt = bltcpt;
! 422: blitter_nxline ();
! 423: if (blt_info.vblitsize == 0)
! 424: bltstate = BLT_done;
! 425:
1.1 root 426: } while (bltstate != BLT_done);
427: } else {
1.1.1.15 root 428: if (blitdesc)
1.1.1.16! root 429: blitter_dofast_desc ();
1.1.1.15 root 430: else
1.1.1.16! root 431: blitter_dofast ();
1.1 root 432: }
1.1.1.2 root 433: blitter_done_notify ();
1.1 root 434: }
435:
1.1.1.16! root 436: void blitter_handler (void)
1.1 root 437: {
438: if (!dmaen(DMA_BLITTER)) {
439: eventtab[ev_blitter].active = 1;
1.1.1.9 root 440: eventtab[ev_blitter].oldcycles = get_cycles ();
441: eventtab[ev_blitter].evtime = 10 * CYCLE_UNIT + get_cycles (); /* wait a little */
1.1 root 442: return; /* gotta come back later. */
443: }
1.1.1.16! root 444: actually_do_blit ();
1.1.1.3 root 445:
1.1 root 446: INTREQ(0x8040);
447: eventtab[ev_blitter].active = 0;
1.1.1.8 root 448: unset_special (SPCFLAG_BLTNASTY);
1.1 root 449: }
450:
1.1.1.12 root 451: static long int blit_cycles;
452: static long blit_firstline_cycles;
453: static long blit_first_cycle;
454: static int blit_last_cycle;
455: static uae_u8 *blit_diag;
1.1.1.3 root 456:
1.1.1.16! root 457: void do_blitter (void)
1.1.1.12 root 458: {
459: int ch = (bltcon0 & 0x0f00) >> 8;
460: blit_diag = blit_cycle_diagram_start[ch];
1.1 root 461:
1.1.1.12 root 462: blit_firstline_cycles = blit_first_cycle = get_cycles ();
463: blit_last_cycle = 0;
464: if (!currprefs.immediate_blits) {
1.1 root 465: if (!blitline) {
1.1.1.12 root 466: blit_cycles = blit_diag[1];
467: blit_firstline_cycles += blit_cycles * blt_info.hblitsize * CYCLE_UNIT;
1.1 root 468: blit_cycles *= blt_info.vblitsize * blt_info.hblitsize;
1.1.1.12 root 469: } else
1.1.1.13 root 470: blit_cycles = 20; /* Desert Dream demo freezes if line draw is too fast */
1.1.1.3 root 471: } else
1.1.1.2 root 472: blit_cycles = 1;
473:
474: blit_init();
1.1.1.3 root 475:
1.1.1.2 root 476: eventtab[ev_blitter].active = 1;
1.1.1.9 root 477: eventtab[ev_blitter].oldcycles = get_cycles ();
478: eventtab[ev_blitter].evtime = blit_cycles * CYCLE_UNIT + get_cycles ();
1.1.1.2 root 479: events_schedule();
1.1 root 480:
1.1.1.8 root 481: unset_special (SPCFLAG_BLTNASTY);
1.1.1.2 root 482: if (dmaen(DMA_BLITPRI))
1.1.1.8 root 483: set_special (SPCFLAG_BLTNASTY);
1.1.1.12 root 484:
1.1 root 485: }
486:
1.1.1.12 root 487: void maybe_blit (int modulo)
1.1 root 488: {
489: static int warned = 0;
490: if (bltstate == BLT_done)
491: return;
1.1.1.3 root 492:
1.1 root 493: if (!warned) {
494: warned = 1;
1.1.1.3 root 495: write_log ("warning: Program does not wait for blitter\n");
1.1 root 496: }
497: if (!eventtab[ev_blitter].active)
1.1.1.12 root 498: write_log ("FOO!!?\n");
499:
500: if (modulo && get_cycles() < blit_firstline_cycles)
501: return;
1.1.1.8 root 502: blitter_handler ();
1.1 root 503: }
1.1.1.12 root 504:
505: int blitnasty (void)
506: {
507: int cycles, ccnt;
508: if (!(regs.spcflags & SPCFLAG_BLTNASTY))
509: return 0;
510: if (bltstate == BLT_done)
511: return 0;
512: if (!dmaen(DMA_BLITTER))
513: return 0;
514: cycles = (get_cycles () - blit_first_cycle) / CYCLE_UNIT;
515: ccnt = 0;
516: while (blit_last_cycle < cycles) {
517: int c;
518: if (blit_last_cycle < blit_diag[0])
519: c = blit_diag[blit_last_cycle + 2];
520: else
1.1.1.13 root 521: c = blit_diag[((blit_last_cycle - blit_diag[0]) % blit_diag[1]) + 2 + blit_diag[0]];
1.1.1.12 root 522: blit_last_cycle ++;
523: if (!c)
524: return 0;
525: ccnt++;
526: }
527: return ccnt;
528: }
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