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All proper inputs are now provided to the audio generator.

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Hopefully. The next job is to generate audio. If that sounds correct, then the disk motor speed question can be tackled.
This commit is contained in:
Thomas Harte 2019-06-01 15:03:15 -04:00
parent 723137c0d4
commit 6d985866ee
5 changed files with 75 additions and 30 deletions
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34
Machines/Apple/Macintosh/DeferredAudio.hpp Normal file
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@ -0,0 +1,34 @@
//
// DeferredAudio.hpp
// Clock Signal
//
// Created by Thomas Harte on 01/06/2019.
// Copyright © 2019 Thomas Harte. All rights reserved.
//
#ifndef DeferredAudio_h
#define DeferredAudio_h
#include "Audio.hpp"
#include "../../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
namespace Apple {
namespace Macintosh {
struct DeferredAudio {
Concurrency::DeferringAsyncTaskQueue queue;
Audio audio;
Outputs::Speaker::LowpassSpeaker<Audio> speaker;
HalfCycles time_since_update;
DeferredAudio() : audio(queue), speaker(audio) {}
void flush() {
speaker.run_for(queue, time_since_update.flush_cycles());
}
};
}
}
#endif /* DeferredAudio_h */

33
Machines/Apple/Macintosh/Macintosh.cpp
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@ -10,7 +10,7 @@
#include <array>
#include "Audio.hpp"
#include "DeferredAudio.hpp"
#include "Keyboard.hpp"
#include "RealTimeClock.hpp"
#include "Video.hpp"
@ -21,7 +21,6 @@
#include "../../../Components/6522/6522.hpp"
#include "../../../Components/DiskII/IWM.hpp"
#include "../../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "../../../Processors/68000/68000.hpp"
#include "../../Utility/MemoryPacker.hpp"
@ -42,7 +41,7 @@ class ConcreteMachine:
public:
ConcreteMachine(const ROMMachine::ROMFetcher &rom_fetcher) :
mc68000_(*this),
video_(ram_.data()),
video_(ram_.data(), audio_),
via_(via_port_handler_),
via_port_handler_(*this, clock_, keyboard_, video_, audio_, iwm_),
iwm_(CLOCK_RATE) {
@ -57,6 +56,7 @@ class ConcreteMachine:
// The Mac runs at 7.8336mHz.
set_clock_rate(double(CLOCK_RATE));
audio_.speaker.set_input_rate(float(CLOCK_RATE));
}
void set_scan_target(Outputs::Display::ScanTarget *scan_target) override {
@ -243,8 +243,8 @@ class ConcreteMachine:
ROM_is_overlay_ = rom_is_overlay;
}
void set_use_alternate_screen_buffer(bool use_alternate_screen_buffer) {
video_.set_use_alternate_screen_buffer(use_alternate_screen_buffer);
void set_use_alternate_buffers(bool use_alternate_screen_buffer, bool use_alternate_audio_buffer) {
video_.set_use_alternate_buffers(use_alternate_screen_buffer, use_alternate_audio_buffer);
}
private:
@ -259,22 +259,9 @@ class ConcreteMachine:
}
};
struct Audio {
Concurrency::DeferringAsyncTaskQueue queue;
Apple::Macintosh::Audio audio;
Outputs::Speaker::LowpassSpeaker<Apple::Macintosh::Audio> speaker;
HalfCycles time_since_update;
Audio() : audio(queue), speaker(audio) {}
void flush() {
speaker.run_for(queue, time_since_update.flush_cycles());
}
};
class VIAPortHandler: public MOS::MOS6522::PortHandler {
public:
VIAPortHandler(ConcreteMachine &machine, RealTimeClock &clock, Keyboard &keyboard, Video &video, Audio &audio, IWM &iwm) :
VIAPortHandler(ConcreteMachine &machine, RealTimeClock &clock, Keyboard &keyboard, Video &video, DeferredAudio &audio, IWM &iwm) :
machine_(machine), clock_(clock), keyboard_(keyboard), video_(video), audio_(audio), iwm_(iwm) {}
using Port = MOS::MOS6522::Port;
@ -299,13 +286,11 @@ class ConcreteMachine:
iwm_.flush();
iwm_.iwm.set_select(!(value & 0x20));
machine_.set_use_alternate_screen_buffer(!(value & 0x40));
machine_.set_use_alternate_buffers(!(value & 0x40), !(value&0x08));
machine_.set_rom_is_overlay(!!(value & 0x10));
audio_.flush();
audio_.audio.set_volume(value & 7);
// TODO: alternate sound buffer.
break;
case Port::B:
@ -360,7 +345,7 @@ class ConcreteMachine:
RealTimeClock &clock_;
Keyboard &keyboard_;
Video &video_;
Audio &audio_;
DeferredAudio &audio_;
IWM &iwm_;
};
@ -369,8 +354,8 @@ class ConcreteMachine:
CPU::MC68000::Processor<ConcreteMachine, true> mc68000_;
DeferredAudio audio_;
Video video_;
Audio audio_;
RealTimeClock clock_;
Keyboard keyboard_;

21
Machines/Apple/Macintosh/Video.cpp
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@ -33,7 +33,8 @@ const int sync_end = 38;
// "The visible portion of a full-screen display consists of 342 horizontal scan lines...
// During the vertical blanking interval, the turned-off beam ... traces out an additional 28 scan lines,"
//
Video::Video(uint16_t *ram) :
Video::Video(uint16_t *ram, DeferredAudio &audio) :
audio_(audio),
crt_(704, 1, 370, Outputs::Display::ColourSpace::YIQ, 1, 1, 6, false, Outputs::Display::InputDataType::Luminance1),
ram_(ram) {
@ -131,6 +132,14 @@ void Video::run_for(HalfCycles duration) {
crt_.output_blank((44 - sync_end) * 16);
}
}
// Audio and disk fetches occur "just before video data".
if(final_word == 44) {
const uint16_t audio_word = ram_[audio_address_];
++audio_address_;
audio_.audio.post_sample(audio_word >> 8);
// TODO: post disk byte.
}
}
duration -= cycles_left_in_line;
@ -141,6 +150,12 @@ void Video::run_for(HalfCycles duration) {
Video: $1A700 and the alternate buffer starts at $12700; for a 512K Macintosh, add $60000 to these numbers.
*/
video_address_ = use_alternate_screen_buffer_ ? (0x12700 >> 1) : (0x1a700 >> 1);
/*
"The main sound buffer is at $1FD00 in a 128K Macintosh, and the alternate buffer is at $1A100;
for a 512K Macintosh, add $60000 to these values."
*/
audio_address_ = use_alternate_audio_buffer_ ? (0x1fd00 >> 1) : (0x1a100 >> 1);
}
}
}
@ -156,7 +171,7 @@ bool Video::is_outputting() {
return line < 342 && column < 32;
}
void Video::set_use_alternate_screen_buffer(bool use_alternate_screen_buffer) {
void Video::set_use_alternate_buffers(bool use_alternate_screen_buffer, bool use_alternate_audio_buffer) {
use_alternate_screen_buffer_ = use_alternate_screen_buffer;
use_alternate_audio_buffer_ = use_alternate_audio_buffer;
}

15
Machines/Apple/Macintosh/Video.hpp
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@ -11,29 +11,38 @@
#include "../../../Outputs/CRT/CRT.hpp"
#include "../../../ClockReceiver/ClockReceiver.hpp"
#include "DeferredAudio.hpp"
namespace Apple {
namespace Macintosh {
class Video {
public:
Video(uint16_t *ram);
Video(uint16_t *ram, DeferredAudio &audio);
void set_scan_target(Outputs::Display::ScanTarget *scan_target);
void run_for(HalfCycles duration);
void set_use_alternate_screen_buffer(bool use_alternate_screen_buffer);
void set_use_alternate_buffers(bool use_alternate_screen_buffer, bool use_alternate_audio_buffer);
// TODO: feedback on blanks and syncs.
bool vsync();
bool is_outputting();
private:
DeferredAudio &audio_;
uint16_t *ram_ = nullptr;
Outputs::CRT::CRT crt_;
HalfCycles frame_position_;
size_t video_address_ = 0;
uint16_t *ram_ = nullptr;
size_t audio_address_ = 0;
uint8_t *pixel_buffer_ = nullptr;
bool use_alternate_screen_buffer_ = false;
bool use_alternate_audio_buffer_ = false;
};
}

2
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -1328,6 +1328,7 @@
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4BB298ED1B587D8400A49093 /* tyan */ = {isa = PBXFileReference; lastKnownFileType = file; path = tyan; sourceTree = "<group>"; };
4BB2A9AE1E13367E001A5C23 /* CRCTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = CRCTests.mm; sourceTree = "<group>"; };
4BB4BFAA22A300710069048D /* DeferredAudio.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = DeferredAudio.hpp; sourceTree = "<group>"; };
4BB697C61D4B558F00248BDF /* Factors.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = Factors.hpp; path = ../../NumberTheory/Factors.hpp; sourceTree = "<group>"; };
4BB697C91D4B6D3E00248BDF /* TimedEventLoop.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = TimedEventLoop.cpp; sourceTree = "<group>"; };
4BB697CA1D4B6D3E00248BDF /* TimedEventLoop.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = TimedEventLoop.hpp; sourceTree = "<group>"; };
@ -3072,6 +3073,7 @@
4BCE0058227CFFCA000CA200 /* Macintosh.cpp */,
4BCE005E227D39AB000CA200 /* Video.cpp */,
4B9378E322A199C600973513 /* Audio.hpp */,
4BB4BFAA22A300710069048D /* DeferredAudio.hpp */,
4BDB3D8522833321002D3CEE /* Keyboard.hpp */,
4BCE0059227CFFCA000CA200 /* Macintosh.hpp */,
4BD0692B22828A2D00D2A54F /* RealTimeClock.hpp */,