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- /*
- * PicoDrive
- * (C) notaz, 2007
- *
- * This work is licensed under the terms of MAME license.
- * See COPYING file in the top-level directory.
- */
- #include "../pico_int.h"
- #include "cell_map.c"
- #ifndef UTYPES_DEFINED
- typedef unsigned short u16;
- #endif
- // check: Heart of the alien, jaguar xj 220
- PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
- {
- unsigned char *base;
- unsigned int asrc, a2;
- u16 *r;
- base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
- switch (Pico.video.type)
- {
- case 1: // vram
- r = PicoMem.vram;
- for(; len; len--)
- {
- asrc = cell_map(source >> 2) << 2;
- asrc |= source & 2;
- // if(a&1) d=(d<<8)|(d>>8); // ??
- r[a>>1] = *(u16 *)(base + asrc);
- source += 2;
- // AutoIncrement
- a=(u16)(a+inc);
- }
- Pico.est.rendstatus |= PDRAW_SPRITES_MOVED;
- break;
- case 3: // cram
- Pico.m.dirtyPal = 1;
- r = PicoMem.cram;
- for(a2=a&0x7f; len; len--)
- {
- asrc = cell_map(source >> 2) << 2;
- asrc |= source & 2;
- r[a2>>1] = *(u16 *)(base + asrc);
- source += 2;
- // AutoIncrement
- a2+=inc;
- // good dest?
- if(a2 >= 0x80) break;
- }
- a=(a&0xff00)|a2;
- break;
- case 5: // vsram[a&0x003f]=d;
- r = PicoMem.vsram;
- for(a2=a&0x7f; len; len--)
- {
- asrc = cell_map(source >> 2) << 2;
- asrc |= source & 2;
- r[a2>>1] = *(u16 *)(base + asrc);
- source += 2;
- // AutoIncrement
- a2+=inc;
- // good dest?
- if(a2 >= 0x80) break;
- }
- a=(a&0xff00)|a2;
- break;
- }
- // remember addr
- Pico.video.addr=(u16)a;
- }
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