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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_400
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413_01
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sbf3
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sbfm.c
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C/C++ Source or Header
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1993-09-19
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4KB
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150 lines
#include <stdio.h>
#include <dos.h>
#include "sb.h"
static void WriteFM(int chip, int addr, unsigned char data)
{
register int ChipAddr = SbIOaddr + ((chip) ? RIGHT_FM_ADDRESS :
LEFT_FM_ADDRESS);
outportb(ChipAddr,addr);
inportb(ChipAddr);
outportb(ChipAddr+1,data);
inportb(ChipAddr);
inportb(ChipAddr);
inportb(ChipAddr);
inportb(ChipAddr);
}
void Sb_FM_Reset(void)
{
WriteFM(0,1,0);
WriteFM(1,1,0);
}
void Sb_FM_Key_Off(int voice)
{
unsigned char reg_num;
int chip = voice / 11;
/* turn voice off */
reg_num = 0xB0 + voice % 11;
WriteFM(chip,reg_num,0);
}
void Sb_FM_Key_On(int voice, int freq, int octave)
{
register unsigned char reg_num;
unsigned char tmp;
int chip = voice / 11;
reg_num = 0xa0 + voice % 11;
WriteFM(chip,reg_num,freq & 0xff);
reg_num = 0xb0 + voice % 11;
tmp = (freq >> 8) | (octave << 2) | 0x20;
WriteFM(chip,reg_num,tmp);
}
void Sb_FM_Voice_Volume(int voice, int vol)
{
unsigned char reg_num;
int chip = voice / 11;
reg_num = 0x40 + voice % 11;
WriteFM(chip,reg_num,vol);
}
void Sb_FM_Set_Voice(int voice_num, FM_Instrument *ins)
{
register unsigned char op_cell_num;
int cell_offset;
int chip = voice_num / 11;
voice_num %= 11;
/* check on voice_num range */
cell_offset = voice_num % 3 + ((voice_num / 3) << 3);
/* set sound characteristic */
op_cell_num = 0x20 + (char)cell_offset;
WriteFM(chip,op_cell_num,ins->SoundCharacteristic[0]);
op_cell_num += 3;
WriteFM(chip,op_cell_num,ins->SoundCharacteristic[1]);
/* set level/output */
op_cell_num = 0x40 + (char)cell_offset;
WriteFM(chip,op_cell_num,ins->Level[0]);
op_cell_num += 3;
WriteFM(chip,op_cell_num,ins->Level[1]);
/* set Attack/Decay */
op_cell_num = 0x60 + (char)cell_offset;
WriteFM(chip,op_cell_num,ins->AttackDecay[0]);
op_cell_num += 3;
WriteFM(chip,op_cell_num,ins->AttackDecay[1]);
/* set Sustain/Release */
op_cell_num = 0x80 + (char)cell_offset;
WriteFM(chip,op_cell_num,ins->SustainRelease[0]);
op_cell_num += 3;
WriteFM(chip,op_cell_num, ins->SustainRelease[1]);
/* set Wave Select */
op_cell_num = 0xE0 + (char)cell_offset;
WriteFM(chip,op_cell_num,ins->WaveSelect[0]);
op_cell_num += 3;
WriteFM(chip,op_cell_num,ins->WaveSelect[1]);
/* set Feedback/Selectivity */
op_cell_num = (unsigned char)0xC0 + (unsigned char)voice_num;
WriteFM(chip,op_cell_num,ins->Feedback);
}
#ifdef TEST
void main()
{
static FM_Instrument instrument = {
0x11, 0x01, 0x8a, 0x40,
0xf1, 0xf1, 0x11, 0xb3,
0x00, 0x00, 0x06, 0x00,
0x00, 0x00, 0x00, 0x00
};
int notes[12] = {0x16B,0x181,0x198,0x1B0,0x1CA,0x1E5,
0x202,0x220,0x241,0x263,0x287,0x2AE};
if(GetSBParams(&SbIOaddr,&SbIRQ,&SbDMAchan))
{
puts("BLASTER environment variable not set.");
exit(1);
}
Sb_FM_Reset();
Sb_FM_Set_Voice(0,&instrument);
Sb_FM_Set_Voice(1,&instrument);
Sb_FM_Set_Voice(11,&instrument);
Sb_FM_Set_Voice(12,&instrument);
Sb_FM_Key_On(0,notes[11],2);
Sb_FM_Key_On(1,notes[3],3);
Sb_FM_Key_On(11,notes[6],3);
Sb_FM_Key_On(12,notes[11],3);
getch();
Sb_FM_Key_Off(0);
Sb_FM_Key_Off(1);
Sb_FM_Key_Off(11);
Sb_FM_Key_Off(12);
Sb_FM_Reset();
}
#endif