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113 lines
3.0 KiB
Plaintext
113 lines
3.0 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 "OPL2.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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}
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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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// 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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const int generated = channel.update(&modulator, &carrier);
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const int known = [[goodValues nextObject] intValue];
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XCTAssertLessThanOrEqual(abs(generated - known), 10, "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: - 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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test_operator.set_attack_decay(0x88);
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test_operator.set_sustain_release(0x88);
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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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// 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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