239 lines
9.0 KiB
C#
239 lines
9.0 KiB
C#
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using System;
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using System.IO;
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namespace MAME.Core
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{
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public struct QSOUND_CHANNEL
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{
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public int bank; /* bank (x16) */
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public int address; /* start address */
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public int pitch; /* pitch */
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public int reg3; /* unknown (always 0x8000) */
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public int loop; /* loop address */
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public int end; /* end address */
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public int vol; /* master volume */
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public int pan; /* Pan value */
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public int reg9; /* unknown */
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/* Work variables */
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public int key; /* Key on / key off */
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public int lvol; /* left volume */
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public int rvol; /* right volume */
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public int lastdt; /* last sample value */
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public int offset; /* current offset counter */
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};
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public struct qsound_info
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{
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/* Private variables */
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public QSOUND_CHANNEL[] channel;
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public int data; /* register latch data */
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public int sample_rom_length;
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public int[] pan_table; /* Pan volume table */
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public float frq_ratio; /* Frequency ratio */
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};
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public unsafe class QSound
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{
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public static sbyte[] qsoundrom;
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public static qsound_info QChip;
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public static void qsound_start()
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{
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int i;
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QChip.sample_rom_length = qsoundrom.Length;
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QChip.channel = new QSOUND_CHANNEL[16];
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//QChip.frq_ratio = 16.0;
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QChip.pan_table = new int[33];
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for (i = 0; i < 33; i++)
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{
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QChip.pan_table[i] = (int)((256 / Math.Sqrt(32)) * Math.Sqrt(i));
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}
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}
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public static void qsound_data_h_w(byte data)
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{
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QChip.data = (QChip.data & 0xff) | (data << 8);
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}
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public static void qsound_data_l_w(byte data)
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{
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QChip.data = (QChip.data & 0xff00) | data;
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}
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public static void qsound_cmd_w(byte data)
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{
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qsound_set_command(data, QChip.data);
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}
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public static byte qsound_status_r()
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{
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/* Port ready bit (0x80 if ready) */
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return 0x80;
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}
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private static void qsound_set_command(int data, int value)
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{
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int ch = 0, reg = 0;
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if (data < 0x80)
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{
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ch = data >> 3;
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reg = data & 0x07;
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}
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else
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{
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if (data < 0x90)
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{
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ch = data - 0x80;
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reg = 8;
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}
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else
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{
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if (data >= 0xba && data < 0xca)
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{
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ch = data - 0xba;
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reg = 9;
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}
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else
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{
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/* Unknown registers */
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ch = 99;
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reg = 99;
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}
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}
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}
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switch (reg)
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{
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case 0: /* Bank */
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ch = (ch + 1) & 0x0f; /* strange ... */
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QChip.channel[ch].bank = (value & 0x7f) << 16;
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break;
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case 1: /* start */
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QChip.channel[ch].address = value;
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break;
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case 2: /* pitch */
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QChip.channel[ch].pitch = value * 16;
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if (value == 0)
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{
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/* Key off */
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QChip.channel[ch].key = 0;
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}
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break;
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case 3: /* unknown */
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QChip.channel[ch].reg3 = value;
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break;
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case 4: /* loop offset */
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QChip.channel[ch].loop = value;
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break;
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case 5: /* end */
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QChip.channel[ch].end = value;
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break;
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case 6: /* master volume */
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if (value == 0)
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{
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/* Key off */
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QChip.channel[ch].key = 0;
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}
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else if (QChip.channel[ch].key == 0)
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{
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/* Key on */
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QChip.channel[ch].key = 1;
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QChip.channel[ch].offset = 0;
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QChip.channel[ch].lastdt = 0;
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}
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QChip.channel[ch].vol = value;
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break;
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case 7: /* unused */
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break;
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case 8:
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{
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int pandata = (value - 0x10) & 0x3f;
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if (pandata > 32)
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{
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pandata = 32;
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}
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QChip.channel[ch].rvol = QChip.pan_table[pandata];
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QChip.channel[ch].lvol = QChip.pan_table[32 - pandata];
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QChip.channel[ch].pan = value;
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}
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break;
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case 9:
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QChip.channel[ch].reg9 = value;
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break;
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}
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}
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public static void qsound_update(int offset, int length)
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{
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int i, j;
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int rvol, lvol, count;
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for (i = 0; i < length; i++)
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{
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Sound.qsoundstream.streamoutput_Ptrs[0][offset + i] = 0;
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Sound.qsoundstream.streamoutput_Ptrs[1][offset + i] = 0;
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}
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for (i = 0; i < 16; i++)
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{
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if (QChip.channel[i].key != 0)
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{
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rvol = (QChip.channel[i].rvol * QChip.channel[i].vol) >> 8;
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lvol = (QChip.channel[i].lvol * QChip.channel[i].vol) >> 8;
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for (j = 0; j < length; j++)
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{
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count = (QChip.channel[i].offset) >> 16;
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QChip.channel[i].offset &= 0xffff;
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if (count != 0)
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{
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QChip.channel[i].address += count;
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if (QChip.channel[i].address >= QChip.channel[i].end)
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{
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if (QChip.channel[i].loop == 0)
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{
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/* Reached the end of a non-looped sample */
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QChip.channel[i].key = 0;
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break;
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}
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/* Reached the end, restart the loop */
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QChip.channel[i].address = (QChip.channel[i].end - QChip.channel[i].loop) & 0xffff;
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}
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QChip.channel[i].lastdt = qsoundrom[(QChip.channel[i].bank + QChip.channel[i].address) % (QChip.sample_rom_length)];
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}
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Sound.qsoundstream.streamoutput_Ptrs[0][offset + j] += ((QChip.channel[i].lastdt * lvol) >> 6);
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Sound.qsoundstream.streamoutput_Ptrs[1][offset + j] += ((QChip.channel[i].lastdt * rvol) >> 6);
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QChip.channel[i].offset += QChip.channel[i].pitch;
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}
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}
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}
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}
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public static void SaveStateBinary(BinaryWriter writer)
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{
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int i;
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for (i = 0; i < 16; i++)
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{
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writer.Write(QChip.channel[i].bank);
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writer.Write(QChip.channel[i].address);
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writer.Write(QChip.channel[i].pitch);
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writer.Write(QChip.channel[i].loop);
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writer.Write(QChip.channel[i].end);
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writer.Write(QChip.channel[i].vol);
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writer.Write(QChip.channel[i].pan);
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writer.Write(QChip.channel[i].key);
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writer.Write(QChip.channel[i].lvol);
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writer.Write(QChip.channel[i].rvol);
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writer.Write(QChip.channel[i].lastdt);
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writer.Write(QChip.channel[i].offset);
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}
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writer.Write(QChip.data);
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}
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public static void LoadStateBinary(BinaryReader reader)
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{
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int i;
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for (i = 0; i < 16; i++)
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{
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QChip.channel[i].bank = reader.ReadInt32();
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QChip.channel[i].address = reader.ReadInt32();
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QChip.channel[i].pitch = reader.ReadInt32();
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QChip.channel[i].loop = reader.ReadInt32();
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QChip.channel[i].end = reader.ReadInt32();
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QChip.channel[i].vol = reader.ReadInt32();
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QChip.channel[i].pan = reader.ReadInt32();
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QChip.channel[i].key = reader.ReadInt32();
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QChip.channel[i].lvol = reader.ReadInt32();
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QChip.channel[i].rvol = reader.ReadInt32();
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QChip.channel[i].lastdt = reader.ReadInt32();
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QChip.channel[i].offset = reader.ReadInt32();
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}
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QChip.data = reader.ReadInt32();
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}
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}
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}
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