mirror of
https://github.com/RaySollium99/picodrive.git
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74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/*
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* PicoDrive
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* (C) notaz, 2007
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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*/
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#include "../pico_int.h"
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#include "cell_map.c"
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// check: Heart of the alien, jaguar xj 220
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PICO_INTERNAL void DmaSlowCell(u32 source, u32 a, int len, unsigned char inc)
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{
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unsigned char *base;
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u32 asrc, a2;
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u16 *r;
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base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
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switch (Pico.video.type)
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{
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case 1: // vram
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r = PicoMem.vram;
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for(; len; len--)
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{
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asrc = cell_map(source >> 2) << 2;
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asrc |= source & 2;
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// if(a&1) d=(d<<8)|(d>>8); // ??
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VideoWriteVRAM(a, *(u16 *)(base + asrc));
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source += 2;
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// AutoIncrement
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a=(u16)(a+inc);
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}
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break;
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case 3: // cram
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Pico.m.dirtyPal = 1;
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r = PicoMem.cram;
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for(a2=a&0x7f; len; len--)
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{
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asrc = cell_map(source >> 2) << 2;
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asrc |= source & 2;
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r[a2>>1] = *(u16 *)(base + asrc);
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source += 2;
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// AutoIncrement
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a2+=inc;
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// good dest?
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if(a2 >= 0x80) break;
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}
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a=(a&0xff00)|a2;
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break;
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case 5: // vsram[a&0x003f]=d;
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r = PicoMem.vsram;
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for(a2=a&0x7f; len; len--)
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{
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asrc = cell_map(source >> 2) << 2;
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asrc |= source & 2;
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r[a2>>1] = *(u16 *)(base + asrc);
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source += 2;
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// AutoIncrement
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a2+=inc;
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// good dest?
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if(a2 >= 0x80) break;
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}
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a=(a&0xff00)|a2;
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break;
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}
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// remember addr
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Pico.video.addr=(u16)a;
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}
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