mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
112 lines
2.4 KiB
C++
112 lines
2.4 KiB
C++
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#include "app.h"
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extern "C" {
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struct Pico
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{
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unsigned char ram[0x10000]; // 0x00000 scratch ram
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unsigned short vram[0x8000]; // 0x10000
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unsigned char zram[0x2000]; // 0x20000 Z80 ram
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unsigned char ioports[0x10];
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unsigned int pad[0x3c]; // unused
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unsigned short cram[0x40]; // 0x22100
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unsigned short vsram[0x40]; // 0x22180
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unsigned char *rom; // 0x22200
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unsigned int romsize; // 0x22204
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// struct PicoMisc m;
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// struct PicoVideo video;
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};
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extern struct Pico Pico;
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}
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unsigned short *EmuScreen=NULL;
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extern "C" unsigned short *framebuff=NULL;
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int EmuWidth=0,EmuHeight=0;
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static int frame=0;
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static int EmuScan(unsigned int num, void *sdata);
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int EmuInit()
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{
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int len=0;
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// PicoOpt=-1;
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// PsndRate=44100; PsndLen=DSoundSeg;
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PicoInit();
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// Allocate screen:
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EmuWidth=320; EmuHeight=224;
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len=EmuWidth*EmuHeight; len<<=1;
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EmuScreen=(unsigned short *)malloc(len); if (EmuScreen==NULL) return 1;
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framebuff=(unsigned short *)malloc((8+320)*(8+224+8)*2);
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memset(EmuScreen,0,len);
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PicoScan=EmuScan;
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return 0;
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}
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void EmuExit()
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{
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//RomFree();
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free(EmuScreen); EmuScreen=NULL; // Deallocate screen
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free(framebuff);
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EmuWidth=EmuHeight=0;
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PicoExit();
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}
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// Megadrive scanline callback:
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static int EmuScan(unsigned int num, void *sdata)
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{
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unsigned short *pd=NULL,*end=NULL;
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unsigned short *ps=NULL;
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if (num>=(unsigned int)EmuHeight) return 0;
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// Copy scanline to screen buffer:
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pd=EmuScreen+(num<<8)+(num<<6); end=pd+320;
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ps=(unsigned short *)sdata;
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do { *pd++=(unsigned short)PicoCram(*ps++); } while (pd<end);
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return 0;
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}
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int EmuFrame()
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{
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char map[12]={0,1,2,3,8,9,10,4,11,12,13,14}; // Joypads, format is UDLR BCAS ZYXM
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int a=0,input=0;
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// Set Megadrive buttons:
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for (a=0;a<12;a++)
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{
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int m=map[a];
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if (m>=0) if (Inp.button[m]>30) input|=1<<a;
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}
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PicoPad[0]=input;
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frame++;
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PsndOut=(short *)DSoundNext; PicoFrame(); PsndOut=NULL;
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// rendermode2
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if(PicoOpt&0x10) {
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unsigned short *pd=EmuScreen;
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unsigned char *ps=(unsigned char*)framebuff+328*8;
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unsigned short palHigh[0x40];
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for(int i = 0; i < 0x40; i++)
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palHigh[i]=(unsigned short)PicoCram(Pico.cram[i]);
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for(int y=0; y < 224; y++) {
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ps+=8;
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for(int x=0; x < 320; x++)
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*pd++=palHigh[*ps++];
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}
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}
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return 0;
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}
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