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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;
1.1.1.3 root 22: uae_u16 bltcon0,bltcon1;
23: uae_u32 bltapt,bltbpt,bltcpt,bltdpt;
1.1 root 24:
25: int blinea_shift;
1.1.1.3 root 26: static uae_u16 blitlpos, blinea, blineb;
27: static uaecptr bltcnxlpt,bltdnxlpt;
1.1 root 28: static int blitline,blitfc,blitfill,blitife,blitdesc,blitsing;
29: static int blitonedot,blitsign;
30: static long int bltwait;
31:
32: struct bltinfo blt_info;
33:
1.1.1.3 root 34: static uae_u8 blit_filltable[256][4][2];
35: uae_u32 blit_masktable[BLITTER_MAX_WORDS];
36: static uae_u16 blit_trashtable[BLITTER_MAX_WORDS];
1.1 root 37: enum blitter_states bltstate;
38:
1.1.1.14 root 39: static uae_u8 blit_cycle_diagram_start[][10] =
40: {
41: { 0, 1, 0 }, /* 0 */
42: { 0, 2, 4,0 }, /* 1 */
43: { 0, 2, 3,0 }, /* 2 */
44: { 2, 3, 3,0, 0,3,4 }, /* 3 */
45: { 0, 3, 2,0,0 }, /* 4 */
46: { 2, 3, 2,0, 0,2,4 }, /* 5 */
47: { 0, 3, 2,3,0 }, /* 6 */
48: { 3, 4, 2,3,0, 0,2,3,4 }, /* 7 */
49: { 0, 2, 1,0 }, /* 8 */
50: { 2, 2, 1,0, 1,4 }, /* 9 */
51: { 0, 2, 1,3 }, /* A */
52: { 3, 3, 1,3,0, 1,3,4 }, /* B */
53: { 2, 3, 1,2, 0,1,2 }, /* C */
54: { 3, 3, 1,2,0, 1,2,4 }, /* D */
55: { 0, 3, 1,2,3 }, /* E */
56: { 4, 4, 1,2,3,0, 1,2,3,4 } /* F */
57: };
58:
1.1 root 59: void build_blitfilltable(void)
60: {
61: unsigned int d, fillmask;
62: int i;
1.1.1.3 root 63:
1.1.1.2 root 64: for (i = 0; i < BLITTER_MAX_WORDS; i++)
65: blit_masktable[i] = 0xFFFF;
1.1.1.3 root 66:
1.1 root 67: for (d = 0; d < 256; d++) {
68: for (i = 0; i < 4; i++) {
69: int fc = i & 1;
1.1.1.3 root 70: uae_u8 data = d;
1.1 root 71: for (fillmask = 1; fillmask != 0x100; fillmask <<= 1) {
1.1.1.3 root 72: uae_u16 tmp = data;
1.1 root 73: if (fc) {
74: if (i & 2)
75: data |= fillmask;
76: else
77: data ^= fillmask;
78: }
79: if (tmp & fillmask) fc = !fc;
80: }
81: blit_filltable[d][i][0] = data;
82: blit_filltable[d][i][1] = fc;
83: }
84: }
85: }
86:
1.1.1.5 root 87: STATIC_INLINE uae_u8 *blit_xlateptr(uaecptr bltpt, int bytecount)
1.1 root 88: {
89: if (!chipmem_bank.check(bltpt,bytecount)) return NULL;
90: return chipmem_bank.xlateaddr(bltpt);
91: }
92:
1.1.1.5 root 93: STATIC_INLINE uae_u8 *blit_xlateptr_desc(uaecptr bltpt, int bytecount)
1.1 root 94: {
95: if (!chipmem_bank.check(bltpt-bytecount, bytecount)) return NULL;
96: return chipmem_bank.xlateaddr(bltpt);
97: }
98:
1.1.1.3 root 99: static void blitter_dofast(void)
1.1 root 100: {
101: int i,j;
1.1.1.7 root 102: uaecptr bltadatptr = 0, bltbdatptr = 0, bltcdatptr = 0, bltddatptr = 0;
1.1.1.3 root 103: uae_u8 mt = bltcon0 & 0xFF;
104:
1.1.1.2 root 105: blit_masktable[0] = blt_info.bltafwm;
106: blit_masktable[blt_info.hblitsize - 1] &= blt_info.bltalwm;
1.1.1.3 root 107:
1.1 root 108: if (bltcon0 & 0x800) {
1.1.1.7 root 109: bltadatptr = bltapt;
110: bltapt += (blt_info.hblitsize*2 + blt_info.bltamod)*blt_info.vblitsize;
1.1 root 111: }
112: if (bltcon0 & 0x400) {
1.1.1.7 root 113: bltbdatptr = bltbpt;
114: bltbpt += (blt_info.hblitsize*2 + blt_info.bltbmod)*blt_info.vblitsize;
1.1 root 115: }
116: if (bltcon0 & 0x200) {
1.1.1.7 root 117: bltcdatptr = bltcpt;
118: bltcpt += (blt_info.hblitsize*2 + blt_info.bltcmod)*blt_info.vblitsize;
1.1 root 119: }
120: if (bltcon0 & 0x100) {
1.1.1.7 root 121: bltddatptr = bltdpt;
122: bltdpt += (blt_info.hblitsize*2 + blt_info.bltdmod)*blt_info.vblitsize;
1.1 root 123: }
1.1.1.3 root 124:
125: if (blitfunc_dofast[mt] && !blitfill)
1.1.1.7 root 126: (*blitfunc_dofast[mt])(bltadatptr, bltbdatptr, bltcdatptr, bltddatptr, &blt_info);
1.1 root 127: else {
1.1.1.3 root 128: uae_u32 blitbhold = blt_info.bltbhold;
129: uae_u32 preva = 0, prevb = 0;
1.1.1.7 root 130: uaecptr dstp = 0;
1.1.1.2 root 131:
1.1.1.11 root 132: /*if (!blitfill) write_log ("minterm %x not present\n",mt); */
1.1.1.3 root 133: for (j = 0; j < blt_info.vblitsize; j++) {
1.1 root 134: blitfc = !!(bltcon1 & 0x4);
135: for (i = 0; i < blt_info.hblitsize; i++) {
1.1.1.3 root 136: uae_u32 bltadat, blitahold;
1.1.1.7 root 137: if (bltadatptr) {
138: bltadat = chipmem_wget (bltadatptr);
139: bltadatptr += 2;
1.1.1.2 root 140: } else
141: bltadat = blt_info.bltadat;
142: bltadat &= blit_masktable[i];
1.1.1.3 root 143: blitahold = (((uae_u32)preva << 16) | bltadat) >> blt_info.blitashift;
1.1.1.2 root 144: preva = bltadat;
145:
1.1.1.7 root 146: if (bltbdatptr) {
147: uae_u16 bltbdat = chipmem_wget (bltbdatptr);
148: bltbdatptr += 2;
1.1.1.3 root 149: blitbhold = (((uae_u32)prevb << 16) | bltbdat) >> blt_info.blitbshift;
1.1.1.2 root 150: prevb = bltbdat;
151: }
1.1.1.7 root 152: if (bltcdatptr) {
153: blt_info.bltcdat = chipmem_wget (bltcdatptr);
154: bltcdatptr += 2;
1.1.1.2 root 155: }
1.1.1.7 root 156: if (dstp) chipmem_wput (dstp, blt_info.bltddat);
157: blt_info.bltddat = blit_func (blitahold, blitbhold, blt_info.bltcdat, mt) & 0xFFFF;
1.1.1.3 root 158: if (blitfill) {
159: uae_u16 d = blt_info.bltddat;
1.1 root 160: int ifemode = blitife ? 2 : 0;
161: int fc1 = blit_filltable[d & 255][ifemode + blitfc][1];
1.1.1.3 root 162: blt_info.bltddat = (blit_filltable[d & 255][ifemode + blitfc][0]
1.1 root 163: + (blit_filltable[d >> 8][ifemode + fc1][0] << 8));
164: blitfc = blit_filltable[d >> 8][ifemode + fc1][1];
165: }
1.1.1.7 root 166: if (blt_info.bltddat)
167: blt_info.blitzero = 0;
168: if (bltddatptr) {
169: dstp = bltddatptr;
170: bltddatptr += 2;
1.1.1.2 root 171: }
1.1 root 172: }
1.1.1.7 root 173: if (bltadatptr) bltadatptr += blt_info.bltamod;
174: if (bltbdatptr) bltbdatptr += blt_info.bltbmod;
175: if (bltcdatptr) bltcdatptr += blt_info.bltcmod;
176: if (bltddatptr) bltddatptr += blt_info.bltdmod;
1.1.1.3 root 177: }
1.1.1.7 root 178: if (dstp) chipmem_wput (dstp, blt_info.bltddat);
1.1.1.2 root 179: blt_info.bltbhold = blitbhold;
1.1 root 180: }
1.1.1.2 root 181: blit_masktable[0] = 0xFFFF;
182: blit_masktable[blt_info.hblitsize - 1] = 0xFFFF;
1.1.1.3 root 183:
1.1 root 184: bltstate = BLT_done;
185: }
186:
1.1.1.3 root 187: static void blitter_dofast_desc(void)
1.1 root 188: {
189: int i,j;
1.1.1.7 root 190: uaecptr bltadatptr = 0, bltbdatptr = 0, bltcdatptr = 0, bltddatptr = 0;
1.1.1.3 root 191: uae_u8 mt = bltcon0 & 0xFF;
192:
1.1.1.2 root 193: blit_masktable[0] = blt_info.bltafwm;
194: blit_masktable[blt_info.hblitsize - 1] &= blt_info.bltalwm;
1.1.1.3 root 195:
1.1 root 196: if (bltcon0 & 0x800) {
1.1.1.7 root 197: bltadatptr = bltapt;
198: bltapt -= (blt_info.hblitsize*2 + blt_info.bltamod)*blt_info.vblitsize;
1.1 root 199: }
200: if (bltcon0 & 0x400) {
1.1.1.7 root 201: bltbdatptr = bltbpt;
202: bltbpt -= (blt_info.hblitsize*2 + blt_info.bltbmod)*blt_info.vblitsize;
1.1 root 203: }
204: if (bltcon0 & 0x200) {
1.1.1.7 root 205: bltcdatptr = bltcpt;
206: bltcpt -= (blt_info.hblitsize*2 + blt_info.bltcmod)*blt_info.vblitsize;
1.1 root 207: }
208: if (bltcon0 & 0x100) {
1.1.1.7 root 209: bltddatptr = bltdpt;
210: bltdpt -= (blt_info.hblitsize*2 + blt_info.bltdmod)*blt_info.vblitsize;
1.1 root 211: }
1.1.1.3 root 212: if (blitfunc_dofast_desc[mt] && !blitfill)
1.1.1.7 root 213: (*blitfunc_dofast_desc[mt])(bltadatptr, bltbdatptr, bltcdatptr, bltddatptr, &blt_info);
1.1 root 214: else {
1.1.1.3 root 215: uae_u32 blitbhold = blt_info.bltbhold;
216: uae_u32 preva = 0, prevb = 0;
1.1.1.7 root 217: uaecptr dstp = 0;
1.1.1.2 root 218:
1.1.1.11 root 219: /* if (!blitfill) write_log ("minterm %x not present\n",mt);*/
1.1.1.3 root 220: for (j = 0; j < blt_info.vblitsize; j++) {
1.1 root 221: blitfc = !!(bltcon1 & 0x4);
222: for (i = 0; i < blt_info.hblitsize; i++) {
1.1.1.3 root 223: uae_u32 bltadat, blitahold;
1.1.1.7 root 224: if (bltadatptr) {
225: bltadat = chipmem_wget (bltadatptr);
226: bltadatptr -= 2;
1.1.1.2 root 227: } else
228: bltadat = blt_info.bltadat;
229: bltadat &= blit_masktable[i];
1.1.1.3 root 230: blitahold = (((uae_u32)bltadat << 16) | preva) >> blt_info.blitdownashift;
1.1.1.2 root 231: preva = bltadat;
1.1.1.7 root 232: if (bltbdatptr) {
233: uae_u16 bltbdat = chipmem_wget (bltbdatptr);
234: bltbdatptr -= 2;
1.1.1.3 root 235: blitbhold = (((uae_u32)bltbdat << 16) | prevb) >> blt_info.blitdownbshift;
1.1.1.2 root 236: prevb = bltbdat;
237: }
1.1.1.7 root 238: if (bltcdatptr) {
239: blt_info.bltcdat = chipmem_wget (bltcdatptr);
240: bltcdatptr -= 2;
1.1.1.2 root 241: }
1.1.1.7 root 242: if (dstp) chipmem_wput (dstp, blt_info.bltddat);
243: blt_info.bltddat = blit_func (blitahold, blitbhold, blt_info.bltcdat, mt) & 0xFFFF;
1.1.1.3 root 244: if (blitfill) {
245: uae_u16 d = blt_info.bltddat;
1.1 root 246: int ifemode = blitife ? 2 : 0;
247: int fc1 = blit_filltable[d & 255][ifemode + blitfc][1];
248: blt_info.bltddat = (blit_filltable[d & 255][ifemode + blitfc][0]
249: + (blit_filltable[d >> 8][ifemode + fc1][0] << 8));
250: blitfc = blit_filltable[d >> 8][ifemode + fc1][1];
251: }
1.1.1.7 root 252: if (blt_info.bltddat)
253: blt_info.blitzero = 0;
254: if (bltddatptr) {
255: dstp = bltddatptr;
256: bltddatptr -= 2;
1.1.1.2 root 257: }
1.1 root 258: }
1.1.1.7 root 259: if (bltadatptr) bltadatptr -= blt_info.bltamod;
260: if (bltbdatptr) bltbdatptr -= blt_info.bltbmod;
261: if (bltcdatptr) bltcdatptr -= blt_info.bltcmod;
262: if (bltddatptr) bltddatptr -= blt_info.bltdmod;
1.1.1.3 root 263: }
1.1.1.7 root 264: if (dstp) chipmem_wput (dstp, blt_info.bltddat);
1.1.1.2 root 265: blt_info.bltbhold = blitbhold;
1.1 root 266: }
1.1.1.2 root 267: blit_masktable[0] = 0xFFFF;
268: blit_masktable[blt_info.hblitsize - 1] = 0xFFFF;
269:
1.1 root 270: bltstate = BLT_done;
271: }
272:
1.1.1.5 root 273: STATIC_INLINE int blitter_read(void)
1.1 root 274: {
275: if (bltcon0 & 0xe00){
1.1.1.7 root 276: if (!dmaen(DMA_BLITTER))
277: return 1;
1.1 root 278: if (bltcon0 & 0x200) blt_info.bltcdat = chipmem_bank.wget(bltcpt);
279: }
280: bltstate = BLT_work;
281: return (bltcon0 & 0xE00) != 0;
282: }
283:
1.1.1.5 root 284: STATIC_INLINE int blitter_write(void)
1.1 root 285: {
286: if (blt_info.bltddat) blt_info.blitzero = 0;
287: if ((bltcon0 & 0x100) || blitline){
288: if (!dmaen(DMA_BLITTER)) return 1;
289: chipmem_bank.wput(bltdpt, blt_info.bltddat);
290: }
291: bltstate = BLT_next;
292: return (bltcon0 & 0x100) != 0;
293: }
294:
1.1.1.5 root 295: STATIC_INLINE void blitter_line_incx(void)
1.1 root 296: {
297: if (++blinea_shift == 16) {
298: blinea_shift = 0;
299: bltcnxlpt += 2;
300: bltdnxlpt += 2;
301: }
302: }
303:
1.1.1.5 root 304: STATIC_INLINE void blitter_line_decx(void)
1.1 root 305: {
306: if (blinea_shift-- == 0) {
307: blinea_shift = 15;
308: bltcnxlpt -= 2;
309: bltdnxlpt -= 2;
310: }
311: }
312:
1.1.1.5 root 313: STATIC_INLINE void blitter_line_decy(void)
1.1 root 314: {
315: bltcnxlpt -= blt_info.bltcmod;
316: bltdnxlpt -= blt_info.bltcmod; /* ??? am I wrong or doesn't KS1.3 set bltdmod? */
317: blitonedot = 0;
318: }
319:
1.1.1.5 root 320: STATIC_INLINE void blitter_line_incy(void)
1.1 root 321: {
322: bltcnxlpt += blt_info.bltcmod;
323: bltdnxlpt += blt_info.bltcmod; /* ??? */
324: blitonedot = 0;
325: }
326:
327: static void blitter_line(void)
328: {
1.1.1.14 root 329: uae_u16 blitahold = blinea >> blinea_shift;
330: uae_u16 blitbhold = blineb & 1 ? 0xFFFF : 0;
331: uae_u16 blitchold = blt_info.bltcdat;
1.1 root 332: blt_info.bltddat = 0;
1.1.1.3 root 333:
1.1.1.15! root 334: if (blitsing && blitonedot)
! 335: blitahold = 0;
1.1 root 336: blitonedot = 1;
337: blt_info.bltddat = blit_func(blitahold, blitbhold, blitchold, bltcon0 & 0xFF);
338: if (!blitsign){
1.1.1.3 root 339: bltapt += (uae_s16)blt_info.bltamod;
1.1 root 340: if (bltcon1 & 0x10){
341: if (bltcon1 & 0x8)
1.1.1.3 root 342: blitter_line_decy();
1.1 root 343: else
1.1.1.3 root 344: blitter_line_incy();
1.1 root 345: } else {
346: if (bltcon1 & 0x8)
1.1.1.3 root 347: blitter_line_decx();
348: else
349: blitter_line_incx();
1.1 root 350: }
351: } else {
1.1.1.3 root 352: bltapt += (uae_s16)blt_info.bltbmod;
1.1 root 353: }
354: if (bltcon1 & 0x10){
355: if (bltcon1 & 0x4)
356: blitter_line_decx();
357: else
358: blitter_line_incx();
359: } else {
360: if (bltcon1 & 0x4)
361: blitter_line_decy();
362: else
363: blitter_line_incy();
364: }
1.1.1.3 root 365: blitsign = 0 > (uae_s16)bltapt;
1.1 root 366: bltstate = BLT_write;
367: }
368:
1.1.1.5 root 369: STATIC_INLINE void blitter_nxline(void)
1.1 root 370: {
371: bltcpt = bltcnxlpt;
372: bltdpt = bltdnxlpt;
373: blineb = (blineb << 1) | (blineb >> 15);
374: if (--blt_info.vblitsize == 0) {
375: bltstate = BLT_done;
376: } else {
377: bltstate = BLT_read;
378: }
379: }
380:
381: static void blit_init(void)
382: {
383: blitlpos = 0;
1.1.1.3 root 384: blt_info.blitzero = 1;
1.1 root 385: blitline = bltcon1 & 1;
1.1.1.3 root 386: blt_info.blitashift = bltcon0 >> 12;
1.1.1.2 root 387: blt_info.blitdownashift = 16 - blt_info.blitashift;
388: blt_info.blitbshift = bltcon1 >> 12;
389: blt_info.blitdownbshift = 16 - blt_info.blitbshift;
1.1.1.3 root 390:
1.1 root 391: if (blitline) {
1.1.1.4 root 392: if (blt_info.hblitsize != 2)
393: write_log ("weird hblitsize in linemode: %d\n", blt_info.hblitsize);
394:
1.1 root 395: bltcnxlpt = bltcpt;
396: bltdnxlpt = bltdpt;
397: blitsing = bltcon1 & 0x2;
398: blinea = blt_info.bltadat;
399: blineb = (blt_info.bltbdat >> blt_info.blitbshift) | (blt_info.bltbdat << (16-blt_info.blitbshift));
400: #if 0
401: if (blineb != 0xFFFF && blineb != 0)
1.1.1.11 root 402: write_log ("%x %x %d %x\n", blineb, blt_info.bltbdat, blt_info.blitbshift, bltcon1);
1.1 root 403: #endif
1.1.1.3 root 404: blitsign = bltcon1 & 0x40;
1.1 root 405: blitonedot = 0;
406: } else {
407: blitfc = !!(bltcon1 & 0x4);
408: blitife = bltcon1 & 0x8;
409: blitfill = bltcon1 & 0x18;
410: if ((bltcon1 & 0x18) == 0x18) {
411: /* Digital "Trash" demo does this; others too. Apparently, no
412: * negative effects. */
413: static int warn = 1;
414: if (warn)
1.1.1.3 root 415: write_log ("warning: weird fill mode (further messages suppressed)\n");
1.1 root 416: warn = 0;
417: }
418: blitdesc = bltcon1 & 0x2;
1.1.1.7 root 419: if (blitfill && !blitdesc) {
420: static int warn = 1;
421: if (warn)
1.1.1.13 root 422: write_log ("warning: blitter fill without desc (further messages suppressed)\n");
1.1.1.7 root 423: warn = 0;
424: }
1.1 root 425: }
426: }
427:
428: static void actually_do_blit(void)
429: {
430: if (blitline) {
431: do {
432: blitter_read();
433: blitter_line();
434: blitter_write();
435: blitter_nxline();
436: } while (bltstate != BLT_done);
437: } else {
1.1.1.15! root 438: if (blitdesc)
! 439: blitter_dofast_desc();
! 440: else
! 441: blitter_dofast();
1.1 root 442: }
1.1.1.2 root 443: blitter_done_notify ();
1.1 root 444: }
445:
446: void blitter_handler(void)
447: {
448: if (!dmaen(DMA_BLITTER)) {
449: eventtab[ev_blitter].active = 1;
1.1.1.9 root 450: eventtab[ev_blitter].oldcycles = get_cycles ();
451: eventtab[ev_blitter].evtime = 10 * CYCLE_UNIT + get_cycles (); /* wait a little */
1.1 root 452: return; /* gotta come back later. */
453: }
454: actually_do_blit();
1.1.1.3 root 455:
1.1 root 456: INTREQ(0x8040);
457: eventtab[ev_blitter].active = 0;
1.1.1.8 root 458: unset_special (SPCFLAG_BLTNASTY);
1.1 root 459: }
460:
1.1.1.12 root 461: static long int blit_cycles;
462: static long blit_firstline_cycles;
463: static long blit_first_cycle;
464: static int blit_last_cycle;
465: static uae_u8 *blit_diag;
1.1.1.3 root 466:
1.1.1.12 root 467: void do_blitter(void)
468: {
469: int ch = (bltcon0 & 0x0f00) >> 8;
470: blit_diag = blit_cycle_diagram_start[ch];
1.1 root 471:
1.1.1.12 root 472: blit_firstline_cycles = blit_first_cycle = get_cycles ();
473: blit_last_cycle = 0;
474: if (!currprefs.immediate_blits) {
1.1 root 475: if (!blitline) {
1.1.1.12 root 476: blit_cycles = blit_diag[1];
477: blit_firstline_cycles += blit_cycles * blt_info.hblitsize * CYCLE_UNIT;
1.1 root 478: blit_cycles *= blt_info.vblitsize * blt_info.hblitsize;
1.1.1.12 root 479: } else
1.1.1.13 root 480: blit_cycles = 20; /* Desert Dream demo freezes if line draw is too fast */
1.1.1.3 root 481: } else
1.1.1.2 root 482: blit_cycles = 1;
483:
484: blit_init();
1.1.1.3 root 485:
1.1.1.2 root 486: eventtab[ev_blitter].active = 1;
1.1.1.9 root 487: eventtab[ev_blitter].oldcycles = get_cycles ();
488: eventtab[ev_blitter].evtime = blit_cycles * CYCLE_UNIT + get_cycles ();
1.1.1.2 root 489: events_schedule();
1.1 root 490:
1.1.1.8 root 491: unset_special (SPCFLAG_BLTNASTY);
1.1.1.2 root 492: if (dmaen(DMA_BLITPRI))
1.1.1.8 root 493: set_special (SPCFLAG_BLTNASTY);
1.1.1.12 root 494:
1.1 root 495: }
496:
1.1.1.12 root 497: void maybe_blit (int modulo)
1.1 root 498: {
499: static int warned = 0;
500: if (bltstate == BLT_done)
501: return;
1.1.1.3 root 502:
1.1 root 503: if (!warned) {
504: warned = 1;
1.1.1.3 root 505: write_log ("warning: Program does not wait for blitter\n");
1.1 root 506: }
507: if (!eventtab[ev_blitter].active)
1.1.1.12 root 508: write_log ("FOO!!?\n");
509:
510: if (modulo && get_cycles() < blit_firstline_cycles)
511: return;
1.1.1.8 root 512: blitter_handler ();
1.1 root 513: }
1.1.1.12 root 514:
515: int blitnasty (void)
516: {
517: int cycles, ccnt;
518: if (!(regs.spcflags & SPCFLAG_BLTNASTY))
519: return 0;
520: if (bltstate == BLT_done)
521: return 0;
522: if (!dmaen(DMA_BLITTER))
523: return 0;
524: cycles = (get_cycles () - blit_first_cycle) / CYCLE_UNIT;
525: ccnt = 0;
526: while (blit_last_cycle < cycles) {
527: int c;
528: if (blit_last_cycle < blit_diag[0])
529: c = blit_diag[blit_last_cycle + 2];
530: else
1.1.1.13 root 531: c = blit_diag[((blit_last_cycle - blit_diag[0]) % blit_diag[1]) + 2 + blit_diag[0]];
1.1.1.12 root 532: blit_last_cycle ++;
533: if (!c)
534: return 0;
535: ccnt++;
536: }
537: return ccnt;
538: }
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