206 lines
8.3 KiB
C++
Executable File
206 lines
8.3 KiB
C++
Executable File
// ----------------------------------------------------------------------------
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// ___ ___ ___ ___ ___ ____ ___ _ _
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// /__/ /__/ / / /__ /__/ /__ / /_ / |/ /
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// / / \ /__/ ___/ ___/ ___/ / /__ / / emulator
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//
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// ----------------------------------------------------------------------------
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// Copyright 2005 Greg Stanton
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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// ----------------------------------------------------------------------------
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// TiaSound is Copyright(c) 1997 by Ron Fries
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of version 2 of the GNU Library General Public License
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// as published by the Free Software Foundation.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library
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// General Public License for more details.
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// To obtain a copy of the GNU Library General Public License, write to the
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// Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// Any permitted reproduction of these routines, in whole or in part, must
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// bear this legend.
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// ----------------------------------------------------------------------------
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// Tia.cpp
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// ----------------------------------------------------------------------------
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#include "Tia.h"
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#define TIA_POLY4_SIZE 15
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#define TIA_POLY5_SIZE 31
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#define TIA_POLY9_SIZE 511
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byte tia_buffer[TIA_BUFFER_SIZE] = {0};
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uint tia_size = 524;
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static const byte TIA_POLY4[ ] = {1,1,0,1,1,1,0,0,0,0,1,0,1,0,0};
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static const byte TIA_POLY5[ ] = {0,0,1,0,1,1,0,0,1,1,1,1,1,0,0,0,1,1,0,1,1,1,0,1,0,1,0,0,0,0,1};
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static const byte TIA_POLY9[ ] = {0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,1,1,1,0,0,1,0,1,0,0,1,1,1,1,1,0,0,1,1,0,1,1,0,1,0,1,1,1,0,1,1,0,0,1,0,0,1,1,1,1,0,1,0,0,0,0,1,1,0,1,1,0,0,0,1,0,0,0,1,1,1,1,0,1,0,1,1,0,1,0,1,0,0,0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0,1,1,0,1,1,0,0,1,1,1,1,1,0,0,1,1,0,0,0,1,1,0,1,0,0,0,1,1,0,0,1,1,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,0,1,0,1,1,0,1,1,0,1,0,0,1,0,0,1,1,1,1,1,1,0,1,1,1,1,0,1,1,0,0,0,0,1,1,1,1,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,1,0,1,1,0,0,0,0,1,0,1,1,1,1,0,1,0,0,0,1,1,0,0,0,1,1,1,0,1,1,1,0,1,0,0,0,0,0,0,0,0,1,0,1,0,0,1,0,0,0,0,1,1,1,0,0,0,1,1,1,0,0,1,1,0,0,1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,1,1,1,1,0,0,0,1,1,1,0,0,0,1,0,0,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,1,1,0,1,1,0,1,0,1,1,1,1,0,0,1,0,1,0,1,1,1,0,0,0,0,0,1,1,0,1,1,0,0,0,1,0,1,0,1,0,0,0,0,1,0,1,1,1,0,0,0,0,1,0,0,1,0,1,0,0,0,1,0,1,1,1,0,0,1,1,1,1,1,1,1,0,0,0,0,0,1,0,0,1,1,0,1,0,0,1,0,0,0,1,0,0,1,0,1,0,0,0,1,1,0,1,0,0,0,0,0,1,1,1,1,0,0,1,0,0,1,0,1,1,1,1,1,1,1,0,1,0,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,0,1,0,0,1,0,1,0,1,0,1,1,1,0,0,1,0,1,1,0,0,1,1,1,1,1,0,0,0,1,1,0};
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static const byte TIA_DIV31[ ] = {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0};
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static byte tia_volume[2] = {0};
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static byte tia_counterMax[2] = {0};
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static byte tia_counter[2] = {0};
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static byte tia_audc[2] = {0};
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static byte tia_audf[2] = {0};
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static byte tia_audv[2] = {0};
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static uint tia_poly4Cntr[2] = {0};
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static uint tia_poly5Cntr[2] = {0};
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static uint tia_poly9Cntr[2] = {0};
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static uint tia_soundCntr = 0;
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// ----------------------------------------------------------------------------
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// ProcessChannel
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// ----------------------------------------------------------------------------
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static void tia_ProcessChannel(byte channel) {
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tia_poly5Cntr[channel]++;
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if(tia_poly5Cntr[channel] == TIA_POLY5_SIZE) {
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tia_poly5Cntr[channel] = 0;
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}
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if(((tia_audc[channel] & 2) == 0) || (((tia_audc[channel] & 1) == 0) && TIA_DIV31[tia_poly5Cntr[channel]]) || (((tia_audc[channel] & 1) == 1) && TIA_POLY5[tia_poly5Cntr[channel]])) {
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if(tia_audc[channel] & 4) {
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tia_volume[channel] = (!tia_volume[channel])? tia_audv[channel]: 0;
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}
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else if(tia_audc[channel] & 8) {
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if(tia_audc[channel] == 8) {
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tia_poly9Cntr[channel]++;
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if(tia_poly9Cntr[channel] == TIA_POLY9_SIZE) {
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tia_poly9Cntr[channel] = 0;
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}
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tia_volume[channel] = (TIA_POLY9[tia_poly9Cntr[channel]])? tia_audv[channel]: 0;
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}
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else {
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tia_volume[channel] = (TIA_POLY5[tia_poly5Cntr[channel]])? tia_audv[channel]: 0;
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}
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}
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else {
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tia_poly4Cntr[channel]++;
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if(tia_poly4Cntr[channel] == TIA_POLY4_SIZE) {
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tia_poly4Cntr[channel] = 0;
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}
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tia_volume[channel] = (TIA_POLY4[tia_poly4Cntr[channel]])? tia_audv[channel]: 0;
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}
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}
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}
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// ----------------------------------------------------------------------------
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// Reset
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// ----------------------------------------------------------------------------
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void tia_Reset( ) {
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tia_soundCntr = 0;
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for(int index = 0; index < 2; index++) {
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tia_volume[index] = 0;
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tia_counterMax[index] = 0;
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tia_counter[index] = 0;
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tia_audc[index] = 0;
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tia_audf[index] = 0;
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tia_audv[index] = 0;
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tia_poly4Cntr[index] = 0;
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tia_poly5Cntr[index] = 0;
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tia_poly9Cntr[index] = 0;
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}
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tia_Clear( );
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}
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// ----------------------------------------------------------------------------
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// Clear
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// ----------------------------------------------------------------------------
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void tia_Clear( ) {
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for(int index = 0; index < TIA_BUFFER_SIZE; index++) {
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tia_buffer[index] = 0;
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}
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}
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// ----------------------------------------------------------------------------
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// SetRegister
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// ----------------------------------------------------------------------------
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void tia_SetRegister(word address, byte data) {
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byte channel;
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byte frequency;
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switch(address) {
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case AUDC0:
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tia_audc[0] = data & 15;
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channel = 0;
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break;
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case AUDC1:
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tia_audc[1] = data & 15;
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channel = 1;
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break;
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case AUDF0:
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tia_audf[0] = data & 31;
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channel = 0;
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break;
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case AUDF1:
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tia_audf[1] = data & 31;
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channel = 1;
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break;
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case AUDV0:
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tia_audv[0] = (data & 15) << 2;
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channel = 0;
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break;
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case AUDV1:
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tia_audv[1] = (data & 15) << 2;
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channel = 1;
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break;
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default:
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return;
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}
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if(tia_audc[channel] == 0) {
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frequency = 0;
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tia_volume[channel] = tia_audv[channel];
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}
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else {
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frequency = tia_audf[channel] + 1;
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if(tia_audc[channel] > 11) {
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frequency *= 3;
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}
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}
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if(frequency != tia_counterMax[channel]) {
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tia_counterMax[channel] = frequency;
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if(tia_counter[channel] == 0 || frequency == 0) {
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tia_counter[channel] = frequency;
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}
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}
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}
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// --------------------------------------------------------------------------------------
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// Process
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// --------------------------------------------------------------------------------------
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void tia_Process(uint length) {
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for(uint index = 0; index < length; index++) {
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if(tia_counter[0] > 1) {
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tia_counter[0]--;
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}
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else if(tia_counter[0] == 1) {
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tia_counter[0] = tia_counterMax[0];
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tia_ProcessChannel(0);
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}
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if(tia_counter[1] > 1) {
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tia_counter[1]--;
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}
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else if(tia_counter[1] == 1) {
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tia_counter[1] = tia_counterMax[1];
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tia_ProcessChannel(1);
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}
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tia_buffer[tia_soundCntr++] = tia_volume[0] + tia_volume[1];
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if(tia_soundCntr >= tia_size) {
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tia_soundCntr = 0;
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}
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}
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} |