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172 lines
5.0 KiB
Plaintext
172 lines
5.0 KiB
Plaintext
//
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// OPLTests.m
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// Clock SignalTests
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//
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// Created by Thomas Harte on 14/04/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#import <XCTest/XCTest.h>
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#include "Tables.hpp"
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#include <cmath>
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@interface OPLTests: XCTestCase
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@end
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@implementation OPLTests
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// MARK: - Table tests
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- (void)testSineLookup {
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for(int c = 0; c < 1024; ++c) {
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const auto logSin = Yamaha::OPL::negative_log_sin(c);
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const auto level = Yamaha::OPL::power_two(logSin);
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double fl_angle = double(c) * M_PI / 512.0;
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double fl_level = sin(fl_angle);
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XCTAssertLessThanOrEqual(fabs(fl_level - double(level) / 4096.0), 0.01, "Sine varies by more than 0.01 at angle %d", c);
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}
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}
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// MARK: - Two-operator FM tests
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/*- (void)compareFMTo:(NSArray *)knownGood atAttenuation:(int)attenuation {
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Yamaha::OPL::Operator modulator, carrier;
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Yamaha::OPL::Channel channel;
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Yamaha::OPL::LowFrequencyOscillator oscillator;
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// Set: AM = 0, PM = 0, EG = 1, KR = 0, MUL = 0
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modulator.set_am_vibrato_hold_sustain_ksr_multiple(0x20);
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carrier.set_am_vibrato_hold_sustain_ksr_multiple(0x20);
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// Set: KL = 0, TL = 0
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modulator.set_scaling_output(attenuation);
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carrier.set_scaling_output(0);
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// Set: waveform = 0.
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modulator.set_waveform(0);
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carrier.set_waveform(0);
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// Set FB = 0, use FM synthesis.
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channel.set_feedback_mode(1);
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// Set: AR = 15, DR = 0.
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modulator.set_attack_decay(0xf0);
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carrier.set_attack_decay(0xf0);
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// Set: SL = 0, RR = 15.
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modulator.set_sustain_release(0x0f);
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carrier.set_sustain_release(0x0f);
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// Set 16384 samples for 1 period, and key-on.
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channel.set_frequency_low(0x40);
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channel.set_9bit_frequency_octave_key_on(0x10);
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// Check one complete cycle of samples.
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NSEnumerator *goodValues = [knownGood objectEnumerator];
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for(int c = 0; c < 16384; ++c) {
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channel.update(true, oscillator, modulator);
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channel.update(false, oscillator, carrier);
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const int generated = channel.melodic_output(modulator, carrier);
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const int known = [[goodValues nextObject] intValue] >> 2;
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XCTAssertLessThanOrEqual(abs(generated - known), 30, "FM synthesis varies by more than 10 at sample %d of attenuation %d", c, attenuation);
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}
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}
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- (void)testFM {
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// The following have been verified by sight against
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// the images at https://www.smspower.org/Development/RE10
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// as "close enough". Sadly the raw data isn't given, so
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// that's the best as I can do. Fingers crossed!
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NSURL *const url = [[NSBundle bundleForClass:[self class]] URLForResource:@"fm" withExtension:@"json"];
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NSArray *const parent = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfURL:url] options:0 error:nil];
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for(int c = 0; c < 64; ++c) {
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[self compareFMTo:parent[c] atAttenuation:c];
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}
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}
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// MARK: - Level tests
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- (int)maxLevelForOPLLAttenuation:(int)attenuation {
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Yamaha::OPL::Operator modulator, carrier;
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Yamaha::OPL::Channel channel;
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Yamaha::OPL::OperatorOverrides overrides;
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Yamaha::OPL::LowFrequencyOscillator oscillator;
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// Reach maximum volume immediately, and hold it during sustain.
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carrier.set_sustain_release(0x0f);
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carrier.set_attack_decay(0xf0);
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// Use FM synthesis.
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channel.set_feedback_mode(1);
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// Set hold sustain level.
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carrier.set_am_vibrato_hold_sustain_ksr_multiple(0x20);
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// Disable the modulator.
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modulator.set_scaling_output(0x3f);
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// Set a non-zero frequency, set key on.
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channel.set_frequency_low(0x40);
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channel.set_9bit_frequency_octave_key_on(0x10);
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// Get the maximum output for this volume level.
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overrides.attenuation = attenuation;
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overrides.use_sustain_level = true;
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int max = 0;
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for(int c = 0; c < 16384; ++c) {
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channel.update(true, oscillator, modulator);
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channel.update(false, oscillator, carrier, false, &overrides);
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const int level = channel.melodic_output(modulator, carrier);
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if(level > max) max = level;
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}
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return max;
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}
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- (void)testOPLLVolumeLevels {
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// Get maximum output levels for all channels.
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int maxLevels[16];
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for(int c = 0; c < 16; ++c) {
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maxLevels[c] = [self maxLevelForOPLLAttenuation:c];
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}
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// Figure out a divider to turn that into the sampled range.
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const double multiplier = 255.0 / double(maxLevels[0]);
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const double expectedLevels[16] = {255.0, 181.0, 127.0, 90.0, 63.0, 45.0, 31.0, 22.0, 15.0, 11.0, 7.0, 5.0, 3.0, 2.0, 1.0, 1.0};
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for(int c = 0; c < 16; ++c) {
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const double empiricalLevel = double(maxLevels[c]) * multiplier;
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XCTAssertLessThanOrEqual(fabs(round(empiricalLevel) - expectedLevels[c]), 2.0, "Fixed attenuation %d was %0.0f; should have been %0.0f", c, empiricalLevel, expectedLevels[c]);
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}
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}
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// MARK: - ADSR tests
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- (void)testADSR {
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// Yamaha::OPL::Operator test_operator;
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// Yamaha::OPL::OperatorState test_state;
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//
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// test_operator.set_attack_decay(0x88);
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// test_operator.set_sustain_release(0x88);
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//
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// // While key is off, output level should remain at 0.
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// for(int c = 0; c < 1024; ++c) {
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// test_operator.update(test_state, false, 0, 0, 0);
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// XCTAssertGreaterThanOrEqual(test_state.level(), 0);
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// }
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//
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// // Set key on...
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// for(int c = 0; c < 4096; ++c) {
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// test_operator.update(test_state, true, 0, 0, 0);
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// NSLog(@"%d", test_state.level());
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// }
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}*/
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@end
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