--- /dev/null
+\r
+#include "PicoInt.h"\r
+\r
+#ifdef MSOUND\r
+extern "C"\r
+{\r
+int YM2612UpdateReq(int) { return 0; }\r
+void *errorlog=NULL;\r
+}\r
+#endif\r
+\r
+int PsndRate=0,PsndLen=0;\r
+short *PsndOut=NULL;\r
+\r
+// An operator is a single sine wave generator\r
+struct Operator\r
+{\r
+ unsigned short angle; // 0-0xffff\r
+ unsigned short freq; // Converted frequency\r
+ unsigned char key;\r
+ unsigned char state; // 1=attack, 2=decay, 3=sustain, 4=release\r
+ int vol;\r
+ int delta; // Change in volume per sample\r
+ int limit; // Next volume limit\r
+};\r
+\r
+struct Channel\r
+{\r
+ struct Operator op[4]; // 4 operators for the channel\r
+ unsigned short note; // Written to 0xa4 and 0xa0\r
+};\r
+\r
+static struct Channel Chan[8];\r
+\r
+unsigned char PicoSreg[0x200];\r
+\r
+static int WriteReg(int side,int a,int d)\r
+{\r
+ struct Channel *pc=NULL;\r
+\r
+ PicoSreg[(side<<8)|a]=(unsigned char)d;\r
+\r
+ if (a==0x28)\r
+ {\r
+ pc=Chan+(d&7);\r
+ // Key On/Key Off\r
+ if (d&0xf0) pc->op[0].state=1; // Attack\r
+ else pc->op[0].state=4; // Release\r
+\r
+ return 0;\r
+ }\r
+\r
+ // Find channel:\r
+ pc=Chan+(a&3); if (side) pc+=4;\r
+\r
+ if ((a&0xf0)==0xa0)\r
+ {\r
+ int n=0,f=0,mult=2455;\r
+\r
+ if (PsndRate>0) mult=44100*2455/PsndRate;\r
+\r
+ if (a&4) pc->note =(unsigned short)(d<<8);\r
+ else pc->note|=d;\r
+\r
+ // Convert to an actual frequency:\r
+ n=pc->note; f=(n&0x7ff)<<((n>>11)&7);\r
+\r
+ pc->op[0].freq=(unsigned short)((f*mult)>>16);\r
+ return 0;\r
+ }\r
+\r
+ return 0;\r
+}\r
+\r
+int PsndReset()\r
+{\r
+ int i=0;\r
+ memset(&Chan,0,sizeof(Chan));\r
+ memset(PicoSreg,0,sizeof(PicoSreg));\r
+\r
+// Change Sine wave into a square wave\r
+ for (i=0x00; i<0x080; i++) Sine[i]= 0x2000;\r
+ for (i=0x80; i<0x100; i++) Sine[i]=-0x2000;\r
+\r
+ return 0;\r
+}\r
+\r
+int PsndFm(int a,int d)\r
+{\r
+ int side=0;\r
+\r
+#ifdef MSOUND\r
+ YM2612Write(0,a&3,(unsigned char)d);\r
+#endif\r
+\r
+ a&=3; side=a>>1; // Which side: channels 0-2 or 3-5\r
+\r
+ if (a&1) WriteReg(side,Pico.s.fmsel[side],d); // Write register\r
+ else Pico.s.fmsel[side]=(unsigned char)d; // Select register\r
+\r
+ return 0;\r
+}\r
+\r
+static void BlankSound(short *dest,int len)\r
+{\r
+ short *end=NULL;\r
+\r
+ end=dest+(len<<1);\r
+\r
+ // Init sound to silence:\r
+ do { *dest=0; dest++; } while (dest<end);\r
+}\r
+\r
+// Add to output and clip:\r
+static inline void AddClip(short *targ,int d)\r
+{\r
+ int total=*targ+d;\r
+ if ((total+0x8000)&0xffff0000)\r
+ {\r
+ if (total>0) total=0x7fff; else total=-0x8000;\r
+ }\r
+ *targ=(short)total;\r
+}\r
+\r
+static void OpNewState(int c)\r
+{\r
+ struct Operator *op=Chan[c].op;\r
+ int off=0;\r
+\r
+ off=((c&4)<<6)|(c&3);\r
+\r
+ switch (op->state)\r
+ {\r
+ case 1:\r
+ {\r
+ // Attack:\r
+ int ar=PicoSreg[0x50|off];\r
+ ar&=0x1f; if (ar) ar+=0x10;\r
+ op->delta=ar<<7; op->limit=0x1000000; break;\r
+ }\r
+ case 2:\r
+ {\r
+ // Decay:\r
+ int d1r=PicoSreg[0x60|off];\r
+ d1r&=0x1f; if (d1r) d1r+=0x10;\r
+ op->delta=-(d1r<<5); op->limit=0;\r
+ }\r
+ break;\r
+ case 3:\r
+ {\r
+ // Sustain:\r
+ int d2r=0,rr=0;\r
+ \r
+ d2r=PicoSreg[0x70|off];\r
+ d2r&=0x1f; if (d2r) d2r+=0x10;\r
+ rr =PicoSreg[0x80|off];\r
+ rr>>=4;\r
+\r
+ op->delta=-(d2r<<5); op->limit=rr<<20;\r
+ }\r
+ break;\r
+ case 4:\r
+ // Release:\r
+ int rr=PicoSreg[0x80|off];\r
+ rr&=0x0f; rr<<=1; rr+=0x10;\r
+ op->delta=-(rr<<5); op->limit=0;\r
+ break;\r
+ }\r
+}\r
+\r
+// Merely adding this code in seems to bugger up the N-Gage???\r
+static void UpdateOp(int c)\r
+{\r
+ struct Operator *op=Chan[c].op;\r
+\r
+ op->angle=(unsigned short)(op->angle+op->freq);\r
+ op->vol+=op->delta;\r
+\r
+ switch (op->state)\r
+ {\r
+ case 1:\r
+ if (op->vol>=op->limit) { op->vol=op->limit; op->state++; OpNewState(c); }\r
+ break;\r
+ case 2: case 3: // Decay/Sustain\r
+ if (op->vol< op->limit) { op->vol=op->limit; op->state++; OpNewState(c); }\r
+ break;\r
+ case 4:\r
+ if (op->vol< op->limit) { op->vol=op->limit; }\r
+ break;\r
+ }\r
+}\r
+\r
+static void AddChannel(int c,short *dest,int len)\r
+{\r
+ struct Channel *pc=Chan+c;\r
+ struct Operator *op=pc->op;\r
+ short *end=NULL;\r
+\r
+ // Work out volume delta for this operator:\r
+ OpNewState(c);\r
+\r
+ end=dest+len;\r
+ do\r
+ {\r
+ int d=0;\r
+ d=Sine[(op->angle>>8)&0xff]>>2;\r
+\r
+ d*=(op->vol>>8); d>>=16;\r
+\r
+ // Add to output:\r
+ AddClip(dest,d);\r
+ UpdateOp(c);\r
+\r
+ dest++;\r
+ }\r
+ while (dest<end);\r
+}\r
+\r
+int PsndRender()\r
+{\r
+ int i=0;\r
+\r
+ if (PsndOut==NULL) return 1; // Not rendering sound\r
+\r
+#ifdef MSOUND\r
+ if (PicoOpt&1)\r
+ {\r
+ short *wave[2]={NULL,NULL};\r
+ wave[0]=PsndOut;\r
+ wave[1]=PsndOut+PsndLen;\r
+ YM2612UpdateOne(0,wave,PsndLen);\r
+ }\r
+#endif\r
+\r
+ if ((PicoOpt&1)==0)\r
+ {\r
+ BlankSound(PsndOut,PsndLen);\r
+ for (i=0;i<7;i++)\r
+ {\r
+ if (i!=3) AddChannel(i,PsndOut,PsndLen);\r
+ }\r
+ }\r
+\r
+ return 0;\r
+}\r
notaz.gp2x.de / cyclone68000.git / blobdiff