| 1 | /* |
| 2 | * PicoDrive |
| 3 | * (C) notaz, 2007 |
| 4 | * |
| 5 | * This work is licensed under the terms of MAME license. |
| 6 | * See COPYING file in the top-level directory. |
| 7 | */ |
| 8 | |
| 9 | #include "../pico_int.h" |
| 10 | |
| 11 | #include "cell_map.c" |
| 12 | |
| 13 | #ifndef UTYPES_DEFINED |
| 14 | typedef unsigned short u16; |
| 15 | #endif |
| 16 | |
| 17 | // check: Heart of the alien, jaguar xj 220 |
| 18 | PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc) |
| 19 | { |
| 20 | unsigned char *base; |
| 21 | unsigned int asrc, a2; |
| 22 | u16 *r; |
| 23 | |
| 24 | base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1]; |
| 25 | |
| 26 | switch (Pico.video.type) |
| 27 | { |
| 28 | case 1: // vram |
| 29 | r = Pico.vram; |
| 30 | for(; len; len--) |
| 31 | { |
| 32 | asrc = cell_map(source >> 2) << 2; |
| 33 | asrc |= source & 2; |
| 34 | // if(a&1) d=(d<<8)|(d>>8); // ?? |
| 35 | r[a>>1] = *(u16 *)(base + asrc); |
| 36 | source += 2; |
| 37 | // AutoIncrement |
| 38 | a=(u16)(a+inc); |
| 39 | } |
| 40 | rendstatus |= PDRAW_SPRITES_MOVED; |
| 41 | break; |
| 42 | |
| 43 | case 3: // cram |
| 44 | Pico.m.dirtyPal = 1; |
| 45 | r = Pico.cram; |
| 46 | for(a2=a&0x7f; len; len--) |
| 47 | { |
| 48 | asrc = cell_map(source >> 2) << 2; |
| 49 | asrc |= source & 2; |
| 50 | r[a2>>1] = *(u16 *)(base + asrc); |
| 51 | source += 2; |
| 52 | // AutoIncrement |
| 53 | a2+=inc; |
| 54 | // good dest? |
| 55 | if(a2 >= 0x80) break; |
| 56 | } |
| 57 | a=(a&0xff00)|a2; |
| 58 | break; |
| 59 | |
| 60 | case 5: // vsram[a&0x003f]=d; |
| 61 | r = Pico.vsram; |
| 62 | for(a2=a&0x7f; len; len--) |
| 63 | { |
| 64 | asrc = cell_map(source >> 2) << 2; |
| 65 | asrc |= source & 2; |
| 66 | r[a2>>1] = *(u16 *)(base + asrc); |
| 67 | source += 2; |
| 68 | // AutoIncrement |
| 69 | a2+=inc; |
| 70 | // good dest? |
| 71 | if(a2 >= 0x80) break; |
| 72 | } |
| 73 | a=(a&0xff00)|a2; |
| 74 | break; |
| 75 | } |
| 76 | // remember addr |
| 77 | Pico.video.addr=(u16)a; |
| 78 | } |
| 79 | |