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914 lines
28 KiB
C++
914 lines
28 KiB
C++
//
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// Atari2600.cpp
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// CLK
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//
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// Created by Thomas Harte on 14/07/2015.
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// Copyright © 2015 Thomas Harte. All rights reserved.
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//
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#include "Atari2600.hpp"
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#include <algorithm>
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#include <stdio.h>
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using namespace Atari2600;
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namespace {
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static const unsigned int horizontalTimerPeriod = 228;
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static const double NTSC_clock_rate = 1194720;
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static const double PAL_clock_rate = 1182298;
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}
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Machine::Machine() :
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_horizontalTimer(0),
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_lastOutputStateDuration(0),
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_lastOutputState(OutputState::Sync),
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_rom(nullptr),
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_tiaInputValue{0xff, 0xff},
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_upcomingEventsPointer(0),
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_objectCounterPointer(0),
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_stateByTime(_stateByExtendTime[0]),
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_cycles_since_speaker_update(0),
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_is_pal_region(false)
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{
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memset(_collisions, 0xff, sizeof(_collisions));
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setup_reported_collisions();
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for(int vbextend = 0; vbextend < 2; vbextend++)
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{
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for(int c = 0; c < 57; c++)
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{
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OutputState state;
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// determine which output state will be active in four cycles from now
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switch(c)
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{
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case 0: case 1: case 2: case 3: state = OutputState::Blank; break;
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case 4: case 5: case 6: case 7: state = OutputState::Sync; break;
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case 8: case 9: case 10: case 11: state = OutputState::ColourBurst; break;
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case 12: case 13: case 14:
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case 15: case 16: state = OutputState::Blank; break;
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case 17: case 18: state = vbextend ? OutputState::Blank : OutputState::Pixel; break;
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default: state = OutputState::Pixel; break;
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}
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_stateByExtendTime[vbextend][c] = state;
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}
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}
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set_clock_rate(NTSC_clock_rate);
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}
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void Machine::setup_output(float aspect_ratio)
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{
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_speaker.reset(new Speaker);
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_crt.reset(new Outputs::CRT::CRT(228, 1, 263, Outputs::CRT::ColourSpace::YIQ, 228, 1, 1));
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_crt->set_output_device(Outputs::CRT::Television);
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// this is the NTSC phase offset function; see below for PAL
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_crt->set_composite_sampling_function(
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"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
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"{"
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"uint c = texture(texID, coordinate).r;"
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"uint y = c & 14u;"
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"uint iPhase = (c >> 4);"
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"float phaseOffset = 6.283185308 * float(iPhase - 1u) / 13.0;"
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"return mix(float(y) / 14.0, step(1, iPhase) * cos(phase + phaseOffset), amplitude);"
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"}");
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_speaker->set_input_rate((float)(get_clock_rate() / 38.0));
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}
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void Machine::switch_region()
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{
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// the PAL function
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_crt->set_composite_sampling_function(
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"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
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"{"
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"uint c = texture(texID, coordinate).r;"
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"uint y = c & 14u;"
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"uint iPhase = (c >> 4);"
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"uint direction = iPhase & 1u;"
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"float phaseOffset = float(7u - direction) + (float(direction) - 0.5) * 2.0 * float(iPhase >> 1);"
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"phaseOffset *= 6.283185308 / 12.0;"
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"return mix(float(y) / 14.0, step(4, (iPhase + 2u) & 15u) * cos(phase + phaseOffset), amplitude);"
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"}");
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_crt->set_new_timing(228, 312, Outputs::CRT::ColourSpace::YUV, 228, 1);
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_is_pal_region = true;
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_speaker->set_input_rate((float)(get_clock_rate() / 38.0));
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set_clock_rate(PAL_clock_rate);
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}
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void Machine::close_output()
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{
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_crt = nullptr;
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}
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Machine::~Machine()
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{
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delete[] _rom;
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close_output();
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}
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void Machine::update_timers(int mask)
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{
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unsigned int upcomingPointerPlus4 = (_upcomingEventsPointer + 4)%number_of_upcoming_events;
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_objectCounterPointer = (_objectCounterPointer + 1)%number_of_recorded_counters;
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ObjectCounter *oneClockAgo = _objectCounter[(_objectCounterPointer - 1 + number_of_recorded_counters)%number_of_recorded_counters];
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ObjectCounter *twoClocksAgo = _objectCounter[(_objectCounterPointer - 2 + number_of_recorded_counters)%number_of_recorded_counters];
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ObjectCounter *now = _objectCounter[_objectCounterPointer];
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// grab the background now, for application in four clocks
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if(mask & (1 << 5) && !(_horizontalTimer&3))
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{
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unsigned int offset = 4 + _horizontalTimer - (horizontalTimerPeriod - 160);
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_upcomingEvents[upcomingPointerPlus4].updates |= Event::Action::Playfield;
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_upcomingEvents[upcomingPointerPlus4].playfieldPixel = _playfield[(offset >> 2)%40];
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}
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if(mask & (1 << 4))
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{
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// the ball becomes visible whenever it hits zero, regardless of whether its status
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// is the result of a counter rollover or a programmatic reset, and there's a four
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// clock delay on that triggering the start signal
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now[4].count = (oneClockAgo[4].count + 1)%160;
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now[4].pixel = oneClockAgo[4].pixel + 1;
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if(!now[4].count) now[4].pixel = 0;
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}
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else
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{
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now[4] = oneClockAgo[4];
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}
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// check for player and missle triggers
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for(int c = 0; c < 4; c++)
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{
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if(mask & (1 << c))
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{
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// update the count
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now[c].count = (oneClockAgo[c].count + 1)%160;
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uint8_t repeatMask = _playerAndMissileSize[c&1] & 7;
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ObjectCounter *rollover;
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ObjectCounter *equality;
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if(c < 2)
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{
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// update the pixel
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now[c].broad_pixel = oneClockAgo[c].broad_pixel + 1;
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switch(repeatMask)
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{
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default: now[c].pixel = oneClockAgo[c].pixel + 1; break;
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case 5: now[c].pixel = oneClockAgo[c].pixel + (now[c].broad_pixel&1); break;
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case 7: now[c].pixel = oneClockAgo[c].pixel + (((now[c].broad_pixel | (now[c].broad_pixel >> 1))^1)&1); break;
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}
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// check for a rollover six clocks ago or equality five clocks ago
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rollover = twoClocksAgo;
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equality = oneClockAgo;
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}
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else
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{
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// update the pixel
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now[c].pixel = oneClockAgo[c].pixel + 1;
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// check for a rollover five clocks ago or equality four clocks ago
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rollover = oneClockAgo;
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equality = now;
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}
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if(
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(rollover[c].count == 159) ||
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(_hasSecondCopy[c&1] && equality[c].count == 16) ||
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(_hasThirdCopy[c&1] && equality[c].count == 32) ||
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(_hasFourthCopy[c&1] && equality[c].count == 64)
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)
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{
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now[c].pixel = 0;
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now[c].broad_pixel = 0;
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}
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}
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else
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{
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now[c] = oneClockAgo[c];
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}
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}
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}
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uint8_t Machine::get_output_pixel()
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{
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ObjectCounter *now = _objectCounter[_objectCounterPointer];
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// get the playfield pixel
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unsigned int offset = _horizontalTimer - (horizontalTimerPeriod - 160);
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uint8_t playfieldColour = ((_playfieldControl&6) == 2) ? _playerColour[offset / 80] : _playfieldColour;
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// ball pixel
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uint8_t ballPixel = 0;
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if(now[4].pixel < _ballSize) {
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ballPixel = _ballGraphicsEnable[_ballGraphicsSelector];
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}
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// determine the player and missile pixels
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uint8_t playerPixels[2] = { 0, 0 };
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uint8_t missilePixels[2] = { 0, 0 };
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for(int c = 0; c < 2; c++)
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{
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if(_playerGraphics[c] && now[c].pixel < 8) {
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playerPixels[c] = (_playerGraphics[_playerGraphicsSelector[c]][c] >> (now[c].pixel ^ _playerReflectionMask[c])) & 1;
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}
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if(!_missileGraphicsReset[c] && now[c+2].pixel < _missileSize[c]) {
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missilePixels[c] = _missileGraphicsEnable[c];
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}
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}
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// accumulate collisions
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int pixel_mask = playerPixels[0] | (playerPixels[1] << 1) | (missilePixels[0] << 2) | (missilePixels[1] << 3) | (ballPixel << 4) | (_playfieldOutput << 5);
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_collisions[0] |= _reportedCollisions[pixel_mask][0];
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_collisions[1] |= _reportedCollisions[pixel_mask][1];
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_collisions[2] |= _reportedCollisions[pixel_mask][2];
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_collisions[3] |= _reportedCollisions[pixel_mask][3];
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_collisions[4] |= _reportedCollisions[pixel_mask][4];
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_collisions[5] |= _reportedCollisions[pixel_mask][5];
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_collisions[6] |= _reportedCollisions[pixel_mask][6];
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_collisions[7] |= _reportedCollisions[pixel_mask][7];
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// apply appropriate priority to pick a colour
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uint8_t playfieldPixel = _playfieldOutput | ballPixel;
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uint8_t outputColour = playfieldPixel ? playfieldColour : _backgroundColour;
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if(!(_playfieldControl&0x04) || !playfieldPixel) {
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if(playerPixels[1] || missilePixels[1]) outputColour = _playerColour[1];
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if(playerPixels[0] || missilePixels[0]) outputColour = _playerColour[0];
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}
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// return colour
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return outputColour;
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}
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void Machine::setup_reported_collisions()
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{
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for(int c = 0; c < 64; c++)
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{
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memset(_reportedCollisions[c], 0, 8);
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int playerPixels[2] = { c&1, (c >> 1)&1 };
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int missilePixels[2] = { (c >> 2)&1, (c >> 3)&1 };
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int ballPixel = (c >> 4)&1;
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int playfieldPixel = (c >> 5)&1;
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if(playerPixels[0] | playerPixels[1]) {
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_reportedCollisions[c][0] |= ((missilePixels[0] & playerPixels[1]) << 7) | ((missilePixels[0] & playerPixels[0]) << 6);
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_reportedCollisions[c][1] |= ((missilePixels[1] & playerPixels[0]) << 7) | ((missilePixels[1] & playerPixels[1]) << 6);
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_reportedCollisions[c][2] |= ((playfieldPixel & playerPixels[0]) << 7) | ((ballPixel & playerPixels[0]) << 6);
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_reportedCollisions[c][3] |= ((playfieldPixel & playerPixels[1]) << 7) | ((ballPixel & playerPixels[1]) << 6);
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_reportedCollisions[c][7] |= ((playerPixels[0] & playerPixels[1]) << 7);
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}
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if(playfieldPixel | ballPixel) {
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_reportedCollisions[c][4] |= ((playfieldPixel & missilePixels[0]) << 7) | ((ballPixel & missilePixels[0]) << 6);
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_reportedCollisions[c][5] |= ((playfieldPixel & missilePixels[1]) << 7) | ((ballPixel & missilePixels[1]) << 6);
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_reportedCollisions[c][6] |= ((playfieldPixel & ballPixel) << 7);
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}
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if(missilePixels[0] & missilePixels[1])
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_reportedCollisions[c][7] |= (1 << 6);
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}
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}
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void Machine::output_pixels(unsigned int count)
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{
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while(count--)
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{
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if(_upcomingEvents[_upcomingEventsPointer].updates)
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{
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// apply any queued changes and flush the record
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if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::HMoveSetup)
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{
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// schedule an extended left border
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_stateByTime = _stateByExtendTime[1];
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// clear any ongoing moves
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if(_hMoveFlags)
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{
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for(int c = 0; c < number_of_upcoming_events; c++)
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{
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_upcomingEvents[c].updates &= ~(Event::Action::HMoveCompare | Event::Action::HMoveDecrement);
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}
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}
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// schedule new moves
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_hMoveFlags = 0x1f;
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_hMoveCounter = 15;
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// follow-through into a compare immediately
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_upcomingEvents[_upcomingEventsPointer].updates |= Event::Action::HMoveCompare;
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}
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if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::HMoveCompare)
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{
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for(int c = 0; c < 5; c++)
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{
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if(((_objectMotion[c] >> 4)^_hMoveCounter) == 7)
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{
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_hMoveFlags &= ~(1 << c);
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}
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}
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if(_hMoveFlags)
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{
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if(_hMoveCounter) _hMoveCounter--;
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_upcomingEvents[(_upcomingEventsPointer+4)%number_of_upcoming_events].updates |= Event::Action::HMoveCompare;
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_upcomingEvents[(_upcomingEventsPointer+2)%number_of_upcoming_events].updates |= Event::Action::HMoveDecrement;
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}
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}
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if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::HMoveDecrement)
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{
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update_timers(_hMoveFlags);
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}
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if(_upcomingEvents[_upcomingEventsPointer].updates & Event::Action::ResetCounter)
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{
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_objectCounter[_objectCounterPointer][_upcomingEvents[_upcomingEventsPointer].counter].count = 0;
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}
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// zero out current update event
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_upcomingEvents[_upcomingEventsPointer].updates = 0;
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}
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// progress to next event
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_upcomingEventsPointer = (_upcomingEventsPointer + 1)%number_of_upcoming_events;
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// determine which output state is currently active
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OutputState primary_state = _stateByTime[_horizontalTimer >> 2];
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OutputState effective_state = primary_state;
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// update pixel timers
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if(primary_state == OutputState::Pixel) update_timers(~0);
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// update the background chain
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if(_horizontalTimer >= 64 && _horizontalTimer <= 160+64 && !(_horizontalTimer&3))
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{
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_playfieldOutput = _nextPlayfieldOutput;
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_nextPlayfieldOutput = _playfield[(_horizontalTimer - 64) >> 2];
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}
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// if vsync is enabled, output the opposite of the automatic hsync output;
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// also honour the vertical blank flag
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if(_vSyncEnabled) {
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effective_state = (effective_state = OutputState::Sync) ? OutputState::Blank : OutputState::Sync;
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} else if(_vBlankEnabled && effective_state == OutputState::Pixel) {
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effective_state = OutputState::Blank;
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}
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// decide what that means needs to be communicated to the CRT
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_lastOutputStateDuration++;
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if(effective_state != _lastOutputState) {
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switch(_lastOutputState) {
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case OutputState::Blank: _crt->output_blank(_lastOutputStateDuration); break;
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case OutputState::Sync: _crt->output_sync(_lastOutputStateDuration); break;
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case OutputState::ColourBurst: _crt->output_colour_burst(_lastOutputStateDuration, 96, 0); break;
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case OutputState::Pixel: _crt->output_data(_lastOutputStateDuration, 1); break;
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}
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_lastOutputStateDuration = 0;
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_lastOutputState = effective_state;
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if(effective_state == OutputState::Pixel) {
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_outputBuffer = _crt->allocate_write_area(160);
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} else {
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_outputBuffer = nullptr;
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}
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}
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// decide on a pixel colour if that's what's happening
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if(effective_state == OutputState::Pixel)
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{
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uint8_t colour = get_output_pixel();
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if(_outputBuffer)
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{
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*_outputBuffer = colour;
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_outputBuffer++;
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}
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}
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// advance horizontal timer, perform reset actions if desired
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_horizontalTimer = (_horizontalTimer + 1) % horizontalTimerPeriod;
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if(!_horizontalTimer)
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{
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// switch back to a normal length left border
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_stateByTime = _stateByExtendTime[0];
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set_ready_line(false);
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}
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}
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}
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unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
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{
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uint8_t returnValue = 0xff;
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unsigned int cycles_run_for = 3;
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// this occurs as a feedback loop — the 2600 requests ready, then performs the cycles_run_for
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// leap to the end of ready only once ready is signalled — because on a 6502 ready doesn't take
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// effect until the next read; therefore it isn't safe to assume that signalling ready immediately
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// skips to the end of the line.
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if(operation == CPU6502::BusOperation::Ready) {
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unsigned int distance_to_end_of_ready = horizontalTimerPeriod - _horizontalTimer;
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cycles_run_for = distance_to_end_of_ready;
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}
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output_pixels(cycles_run_for);
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_cycles_since_speaker_update += cycles_run_for;
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if(operation != CPU6502::BusOperation::Ready) {
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// check for a paging access
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if(_rom_size > 4096 && ((address & 0x1f00) == 0x1f00)) {
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uint8_t *base_ptr = _romPages[0];
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uint8_t first_paging_register = (uint8_t)(0xf8 - (_rom_size >> 14)*2);
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const uint8_t paging_register = address&0xff;
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if(paging_register >= first_paging_register) {
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const uint16_t selected_page = paging_register - first_paging_register;
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if(selected_page * 4096 < _rom_size) {
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base_ptr = &_rom[selected_page * 4096];
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}
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}
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if(base_ptr != _romPages[0]) {
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_romPages[0] = base_ptr;
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_romPages[1] = base_ptr + 1024;
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_romPages[2] = base_ptr + 2048;
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_romPages[3] = base_ptr + 3072;
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}
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}
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// check for a ROM read
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if((address&0x1000) && isReadOperation(operation)) {
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returnValue &= _romPages[(address >> 10)&3][address&1023];
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}
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// check for a RAM access
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if((address&0x1280) == 0x80) {
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if(isReadOperation(operation)) {
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returnValue &= _mos6532.get_ram(address);
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} else {
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_mos6532.set_ram(address, *value);
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}
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}
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// check for a TIA access
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if(!(address&0x1080)) {
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if(isReadOperation(operation)) {
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const uint16_t decodedAddress = address & 0xf;
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switch(decodedAddress) {
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case 0x00: // missile 0 / player collisions
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case 0x01: // missile 1 / player collisions
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case 0x02: // player 0 / playfield / ball collisions
|
|
case 0x03: // player 1 / playfield / ball collisions
|
|
case 0x04: // missile 0 / playfield / ball collisions
|
|
case 0x05: // missile 1 / playfield / ball collisions
|
|
case 0x06: // ball / playfield collisions
|
|
case 0x07: // player / player, missile / missile collisions
|
|
returnValue &= _collisions[decodedAddress];
|
|
break;
|
|
|
|
case 0x08:
|
|
case 0x09:
|
|
case 0x0a:
|
|
case 0x0b:
|
|
// TODO: pot ports
|
|
break;
|
|
|
|
case 0x0c:
|
|
case 0x0d:
|
|
returnValue &= _tiaInputValue[decodedAddress - 0x0c];
|
|
break;
|
|
}
|
|
} else {
|
|
const uint16_t decodedAddress = address & 0x3f;
|
|
switch(decodedAddress) {
|
|
case 0x00:
|
|
_vSyncEnabled = !!(*value & 0x02);
|
|
break;
|
|
case 0x01: _vBlankEnabled = !!(*value & 0x02); break;
|
|
|
|
case 0x02:
|
|
if(_horizontalTimer) set_ready_line(true);
|
|
break;
|
|
case 0x03:
|
|
// Reset is delayed by four cycles.
|
|
_horizontalTimer = horizontalTimerPeriod - 4;
|
|
|
|
// TODO: audio will now be out of synchronisation — fix
|
|
break;
|
|
|
|
case 0x04:
|
|
case 0x05: {
|
|
int entry = decodedAddress - 0x04;
|
|
_playerAndMissileSize[entry] = *value;
|
|
_missileSize[entry] = 1 << ((*value >> 4)&3);
|
|
|
|
uint8_t repeatMask = (*value)&7;
|
|
_hasSecondCopy[entry] = (repeatMask == 1) || (repeatMask == 3);
|
|
_hasThirdCopy[entry] = (repeatMask == 2) || (repeatMask == 3) || (repeatMask == 6);
|
|
_hasFourthCopy[entry] = (repeatMask == 4) || (repeatMask == 6);
|
|
} break;
|
|
|
|
case 0x06:
|
|
case 0x07: _playerColour[decodedAddress - 0x06] = *value; break;
|
|
case 0x08: _playfieldColour = *value; break;
|
|
case 0x09: _backgroundColour = *value; break;
|
|
|
|
case 0x0a: {
|
|
uint8_t old_playfield_control = _playfieldControl;
|
|
_playfieldControl = *value;
|
|
_ballSize = 1 << ((_playfieldControl >> 4)&3);
|
|
|
|
// did the mirroring bit change?
|
|
if((_playfieldControl^old_playfield_control)&1) {
|
|
if(_playfieldControl&1) {
|
|
for(int c = 0; c < 20; c++) _playfield[c+20] = _playfield[19-c];
|
|
} else {
|
|
memcpy(&_playfield[20], _playfield, 20);
|
|
}
|
|
}
|
|
} break;
|
|
case 0x0b:
|
|
case 0x0c: _playerReflectionMask[decodedAddress - 0x0b] = (*value)&8 ? 0 : 7; break;
|
|
|
|
case 0x0d:
|
|
_playfield[0] = ((*value) >> 4)&1;
|
|
_playfield[1] = ((*value) >> 5)&1;
|
|
_playfield[2] = ((*value) >> 6)&1;
|
|
_playfield[3] = (*value) >> 7;
|
|
|
|
if(_playfieldControl&1) {
|
|
for(int c = 0; c < 4; c++) _playfield[39-c] = _playfield[c];
|
|
} else {
|
|
memcpy(&_playfield[20], _playfield, 4);
|
|
}
|
|
break;
|
|
case 0x0e:
|
|
_playfield[4] = (*value) >> 7;
|
|
_playfield[5] = ((*value) >> 6)&1;
|
|
_playfield[6] = ((*value) >> 5)&1;
|
|
_playfield[7] = ((*value) >> 4)&1;
|
|
_playfield[8] = ((*value) >> 3)&1;
|
|
_playfield[9] = ((*value) >> 2)&1;
|
|
_playfield[10] = ((*value) >> 1)&1;
|
|
_playfield[11] = (*value)&1;
|
|
|
|
if(_playfieldControl&1) {
|
|
for(int c = 0; c < 8; c++) _playfield[35-c] = _playfield[c+4];
|
|
} else {
|
|
memcpy(&_playfield[24], &_playfield[4], 8);
|
|
}
|
|
break;
|
|
case 0x0f:
|
|
_playfield[19] = (*value) >> 7;
|
|
_playfield[18] = ((*value) >> 6)&1;
|
|
_playfield[17] = ((*value) >> 5)&1;
|
|
_playfield[16] = ((*value) >> 4)&1;
|
|
_playfield[15] = ((*value) >> 3)&1;
|
|
_playfield[14] = ((*value) >> 2)&1;
|
|
_playfield[13] = ((*value) >> 1)&1;
|
|
_playfield[12] = (*value)&1;
|
|
|
|
if(_playfieldControl&1) {
|
|
for(int c = 0; c < 8; c++) _playfield[27-c] = _playfield[c+12];
|
|
} else {
|
|
memcpy(&_playfield[32], &_playfield[12], 8);
|
|
}
|
|
break;
|
|
|
|
case 0x10: case 0x11: case 0x12: case 0x13:
|
|
case 0x14:
|
|
_upcomingEvents[(_upcomingEventsPointer + 4)%number_of_upcoming_events].updates |= Event::Action::ResetCounter;
|
|
_upcomingEvents[(_upcomingEventsPointer + 4)%number_of_upcoming_events].counter = decodedAddress - 0x10;
|
|
break;
|
|
|
|
case 0x15: case 0x16:
|
|
update_audio();
|
|
_speaker->set_control(decodedAddress - 0x15, *value);
|
|
break;
|
|
|
|
case 0x17: case 0x18:
|
|
update_audio();
|
|
_speaker->set_divider(decodedAddress - 0x17, *value);
|
|
break;
|
|
|
|
case 0x19: case 0x1a:
|
|
update_audio();
|
|
_speaker->set_volume(decodedAddress - 0x19, *value);
|
|
break;
|
|
|
|
case 0x1c:
|
|
_ballGraphicsEnable[1] = _ballGraphicsEnable[0];
|
|
case 0x1b: {
|
|
int index = decodedAddress - 0x1b;
|
|
_playerGraphics[0][index] = *value;
|
|
_playerGraphics[1][index^1] = _playerGraphics[0][index^1];
|
|
} break;
|
|
case 0x1d:
|
|
case 0x1e:
|
|
_missileGraphicsEnable[decodedAddress - 0x1d] = ((*value) >> 1)&1;
|
|
// printf("e:%02x <- %c\n", decodedAddress - 0x1d, ((*value)&1) ? 'E' : '-');
|
|
break;
|
|
case 0x1f:
|
|
_ballGraphicsEnable[0] = ((*value) >> 1)&1;
|
|
break;
|
|
|
|
case 0x20:
|
|
case 0x21:
|
|
case 0x22:
|
|
case 0x23:
|
|
case 0x24:
|
|
_objectMotion[decodedAddress - 0x20] = *value;
|
|
break;
|
|
|
|
case 0x25: _playerGraphicsSelector[0] = (*value)&1; break;
|
|
case 0x26: _playerGraphicsSelector[1] = (*value)&1; break;
|
|
case 0x27: _ballGraphicsSelector = (*value)&1; break;
|
|
|
|
case 0x28:
|
|
case 0x29:
|
|
{
|
|
// TODO: this should properly mean setting a flag and propagating later, I think?
|
|
int index = decodedAddress - 0x28;
|
|
if(!(*value&0x02) && _missileGraphicsReset[index])
|
|
{
|
|
_objectCounter[_objectCounterPointer][index + 2].count = _objectCounter[_objectCounterPointer][index].count;
|
|
|
|
uint8_t repeatMask = _playerAndMissileSize[index] & 7;
|
|
int extra_offset;
|
|
switch(repeatMask)
|
|
{
|
|
default: extra_offset = 3; break;
|
|
case 5: extra_offset = 6; break;
|
|
case 7: extra_offset = 10; break;
|
|
}
|
|
|
|
_objectCounter[_objectCounterPointer][index + 2].count = (_objectCounter[_objectCounterPointer][index + 2].count + extra_offset)%160;
|
|
}
|
|
_missileGraphicsReset[index] = !!((*value) & 0x02);
|
|
// printf("r:%02x <- %c\n", decodedAddress - 0x28, ((*value)&2) ? 'R' : '-');
|
|
}
|
|
break;
|
|
|
|
case 0x2a: {
|
|
// justification for +5: "we need to wait at least 71 [clocks] before the HMOVE operation is complete";
|
|
// which will take 16*4 + 2 = 66 cycles from the first compare, implying the first compare must be
|
|
// in five cycles from now
|
|
// int start_pause = ((_horizontalTimer + 3)&3) + 4;
|
|
_upcomingEvents[(_upcomingEventsPointer + 5)%number_of_upcoming_events].updates |= Event::Action::HMoveSetup;
|
|
} break;
|
|
case 0x2b:
|
|
_objectMotion[0] =
|
|
_objectMotion[1] =
|
|
_objectMotion[2] =
|
|
_objectMotion[3] =
|
|
_objectMotion[4] = 0;
|
|
break;
|
|
case 0x2c:
|
|
_collisions[0] = _collisions[1] = _collisions[2] =
|
|
_collisions[3] = _collisions[4] = _collisions[5] = 0x3f;
|
|
_collisions[6] = 0x7f;
|
|
_collisions[7] = 0x3f;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// check for a PIA access
|
|
if((address&0x1280) == 0x280) {
|
|
if(isReadOperation(operation)) {
|
|
returnValue &= _mos6532.get_register(address);
|
|
} else {
|
|
_mos6532.set_register(address, *value);
|
|
}
|
|
}
|
|
|
|
if(isReadOperation(operation)) {
|
|
*value = returnValue;
|
|
}
|
|
}
|
|
|
|
_mos6532.run_for_cycles(cycles_run_for / 3);
|
|
|
|
return cycles_run_for / 3;
|
|
}
|
|
|
|
void Machine::set_digital_input(Atari2600DigitalInput input, bool state)
|
|
{
|
|
switch (input) {
|
|
case Atari2600DigitalInputJoy1Up: _mos6532.update_port_input(0, 0x10, state); break;
|
|
case Atari2600DigitalInputJoy1Down: _mos6532.update_port_input(0, 0x20, state); break;
|
|
case Atari2600DigitalInputJoy1Left: _mos6532.update_port_input(0, 0x40, state); break;
|
|
case Atari2600DigitalInputJoy1Right: _mos6532.update_port_input(0, 0x80, state); break;
|
|
|
|
case Atari2600DigitalInputJoy2Up: _mos6532.update_port_input(0, 0x01, state); break;
|
|
case Atari2600DigitalInputJoy2Down: _mos6532.update_port_input(0, 0x02, state); break;
|
|
case Atari2600DigitalInputJoy2Left: _mos6532.update_port_input(0, 0x04, state); break;
|
|
case Atari2600DigitalInputJoy2Right: _mos6532.update_port_input(0, 0x08, state); break;
|
|
|
|
// TODO: latching
|
|
case Atari2600DigitalInputJoy1Fire: if(state) _tiaInputValue[0] &= ~0x80; else _tiaInputValue[0] |= 0x80; break;
|
|
case Atari2600DigitalInputJoy2Fire: if(state) _tiaInputValue[1] &= ~0x80; else _tiaInputValue[1] |= 0x80; break;
|
|
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
void Machine::set_switch_is_enabled(Atari2600Switch input, bool state)
|
|
{
|
|
switch(input) {
|
|
case Atari2600SwitchReset: _mos6532.update_port_input(1, 0x01, state); break;
|
|
case Atari2600SwitchSelect: _mos6532.update_port_input(1, 0x02, state); break;
|
|
case Atari2600SwitchColour: _mos6532.update_port_input(1, 0x08, state); break;
|
|
case Atari2600SwitchLeftPlayerDifficulty: _mos6532.update_port_input(1, 0x40, state); break;
|
|
case Atari2600SwitchRightPlayerDifficulty: _mos6532.update_port_input(1, 0x80, state); break;
|
|
}
|
|
}
|
|
|
|
void Machine::set_rom(size_t length, const uint8_t *data)
|
|
{
|
|
_rom_size = 1024;
|
|
while(_rom_size < length && _rom_size < 32768) _rom_size <<= 1;
|
|
|
|
delete[] _rom;
|
|
|
|
_rom = new uint8_t[_rom_size];
|
|
|
|
size_t offset = 0;
|
|
const size_t copy_step = std::min(_rom_size, length);
|
|
while(offset < _rom_size)
|
|
{
|
|
size_t copy_length = std::min(copy_step, _rom_size - offset);
|
|
memcpy(&_rom[offset], data, copy_length);
|
|
offset += copy_length;
|
|
}
|
|
|
|
size_t romMask = _rom_size - 1;
|
|
_romPages[0] = _rom;
|
|
_romPages[1] = &_rom[1024 & romMask];
|
|
_romPages[2] = &_rom[2048 & romMask];
|
|
_romPages[3] = &_rom[3072 & romMask];
|
|
}
|
|
|
|
#pragma mark - Audio
|
|
|
|
void Machine::update_audio()
|
|
{
|
|
unsigned int audio_cycles = _cycles_since_speaker_update / 114;
|
|
|
|
// static unsigned int total_cycles = 0;
|
|
// total_cycles += audio_cycles;
|
|
// static time_t logged_time = 0;
|
|
// time_t time_now = time(nullptr);
|
|
// if(time_now - logged_time > 0)
|
|
// {
|
|
// printf("[s] %ld : %d\n", time_now - logged_time, total_cycles);
|
|
// total_cycles = 0;
|
|
// logged_time = time_now;
|
|
// }
|
|
|
|
_speaker->run_for_cycles(audio_cycles);
|
|
_cycles_since_speaker_update %= 114;
|
|
}
|
|
|
|
void Machine::synchronise()
|
|
{
|
|
update_audio();
|
|
}
|
|
|
|
Atari2600::Speaker::Speaker()
|
|
{
|
|
_poly4_counter[0] = _poly4_counter[1] = 0x00f;
|
|
_poly5_counter[0] = _poly5_counter[1] = 0x01f;
|
|
_poly9_counter[0] = _poly9_counter[1] = 0x1ff;
|
|
}
|
|
|
|
Atari2600::Speaker::~Speaker()
|
|
{
|
|
}
|
|
|
|
void Atari2600::Speaker::set_volume(int channel, uint8_t volume)
|
|
{
|
|
_volume[channel] = volume & 0xf;
|
|
}
|
|
|
|
void Atari2600::Speaker::set_divider(int channel, uint8_t divider)
|
|
{
|
|
_divider[channel] = divider & 0x1f;
|
|
_divider_counter[channel] = 0;
|
|
}
|
|
|
|
void Atari2600::Speaker::set_control(int channel, uint8_t control)
|
|
{
|
|
_control[channel] = control & 0xf;
|
|
}
|
|
|
|
#define advance_poly4(c) _poly4_counter[channel] = (_poly4_counter[channel] >> 1) | (((_poly4_counter[channel] << 3) ^ (_poly4_counter[channel] << 2))&0x008)
|
|
#define advance_poly5(c) _poly5_counter[channel] = (_poly5_counter[channel] >> 1) | (((_poly5_counter[channel] << 4) ^ (_poly5_counter[channel] << 2))&0x010)
|
|
#define advance_poly9(c) _poly9_counter[channel] = (_poly9_counter[channel] >> 1) | (((_poly9_counter[channel] << 4) ^ (_poly9_counter[channel] << 8))&0x100)
|
|
|
|
void Atari2600::Speaker::get_samples(unsigned int number_of_samples, int16_t *target)
|
|
{
|
|
for(unsigned int c = 0; c < number_of_samples; c++)
|
|
{
|
|
target[c] = 0;
|
|
for(int channel = 0; channel < 2; channel++)
|
|
{
|
|
_divider_counter[channel] ++;
|
|
int level = 0;
|
|
switch(_control[channel])
|
|
{
|
|
case 0x0: case 0xb: // constant 1
|
|
level = 1;
|
|
break;
|
|
|
|
case 0x4: case 0x5: // div2 tone
|
|
level = (_divider_counter[channel] / (_divider[channel]+1))&1;
|
|
break;
|
|
|
|
case 0xc: case 0xd: // div6 tone
|
|
level = (_divider_counter[channel] / ((_divider[channel]+1)*3))&1;
|
|
break;
|
|
|
|
case 0x6: case 0xa: // div31 tone
|
|
level = (_divider_counter[channel] / (_divider[channel]+1))%30 <= 18;
|
|
break;
|
|
|
|
case 0xe: // div93 tone
|
|
level = (_divider_counter[channel] / ((_divider[channel]+1)*3))%30 <= 18;
|
|
break;
|
|
|
|
case 0x1: // 4-bit poly
|
|
level = _poly4_counter[channel]&1;
|
|
if(_divider_counter[channel] == _divider[channel]+1)
|
|
{
|
|
_divider_counter[channel] = 0;
|
|
advance_poly4(channel);
|
|
}
|
|
break;
|
|
|
|
case 0x2: // 4-bit poly div31
|
|
level = _poly4_counter[channel]&1;
|
|
if(_divider_counter[channel]%(30*(_divider[channel]+1)) == 18)
|
|
{
|
|
advance_poly4(channel);
|
|
}
|
|
break;
|
|
|
|
case 0x3: // 5/4-bit poly
|
|
level = _output_state[channel];
|
|
if(_divider_counter[channel] == _divider[channel]+1)
|
|
{
|
|
if(_poly5_counter[channel]&1)
|
|
{
|
|
_output_state[channel] = _poly4_counter[channel]&1;
|
|
advance_poly4(channel);
|
|
}
|
|
advance_poly5(channel);
|
|
}
|
|
break;
|
|
|
|
case 0x7: case 0x9: // 5-bit poly
|
|
level = _poly5_counter[channel]&1;
|
|
if(_divider_counter[channel] == _divider[channel]+1)
|
|
{
|
|
_divider_counter[channel] = 0;
|
|
advance_poly5(channel);
|
|
}
|
|
break;
|
|
|
|
case 0xf: // 5-bit poly div6
|
|
level = _poly5_counter[channel]&1;
|
|
if(_divider_counter[channel] == (_divider[channel]+1)*3)
|
|
{
|
|
_divider_counter[channel] = 0;
|
|
advance_poly5(channel);
|
|
}
|
|
break;
|
|
|
|
case 0x8: // 9-bit poly
|
|
level = _poly9_counter[channel]&1;
|
|
if(_divider_counter[channel] == _divider[channel]+1)
|
|
{
|
|
_divider_counter[channel] = 0;
|
|
advance_poly9(channel);
|
|
}
|
|
break;
|
|
}
|
|
|
|
target[c] += _volume[channel] * 1024 * level;
|
|
}
|
|
}
|
|
}
|