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282 lines
6.3 KiB
C++
282 lines
6.3 KiB
C++
//
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// TIA.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 28/01/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#include "TIA.hpp"
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using namespace Atari2600;
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namespace {
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const int cycles_per_line = 228;
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}
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TIA::TIA() :
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horizontal_counter_(0),
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output_cursor_(0),
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pixel_target_(nullptr)
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{
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crt_.reset(new Outputs::CRT::CRT(cycles_per_line * 2 + 1, 1, Outputs::CRT::DisplayType::NTSC60, 1));
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crt_->set_output_device(Outputs::CRT::Television);
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set_output_mode(OutputMode::NTSC);
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}
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void TIA::set_output_mode(Atari2600::TIA::OutputMode output_mode)
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{
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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) / 13.0 + 5.074880441076923;"
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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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TIA::~TIA()
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{
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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, true);
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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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// justification for +5: "we need to wait at least 71 [clocks] before the HMOVE operation is complete";
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// which will take 16*4 + 2 = 66 cycles from the first compare, implying the first compare must be
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// in five cycles from now
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void TIA::run_for_cycles(int number_of_cycles)
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{
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// if part way through a line, definitely perform a partial, at most up to the end of the line
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if(horizontal_counter_)
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{
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int cycles = std::min(number_of_cycles, cycles_per_line - horizontal_counter_);
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output_for_cycles(cycles);
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number_of_cycles -= cycles;
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}
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// output full lines for as long as possible
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while(number_of_cycles >= cycles_per_line)
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{
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output_line();
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number_of_cycles -= cycles_per_line;
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}
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// partly start a new line if necessary
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if(number_of_cycles)
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{
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output_for_cycles(number_of_cycles);
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}
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}
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void TIA::set_vsync(bool vsync)
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{
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}
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void TIA::set_vblank(bool vblank)
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{
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}
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void TIA::reset_horizontal_counter()
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{
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}
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int TIA::get_cycles_until_horizontal_blank(unsigned int from_offset)
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{
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return cycles_per_line - (horizontal_counter_ + (int)from_offset) % cycles_per_line;
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}
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void TIA::set_background_colour(uint8_t colour)
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{
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}
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void TIA::set_playfield(uint16_t offset, uint8_t value)
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{
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}
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void TIA::set_playfield_control_and_ball_size(uint8_t value)
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{
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}
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void TIA::set_playfield_ball_colour(uint8_t colour)
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{
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}
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void TIA::set_player_number_and_size(int player, uint8_t value)
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{
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}
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void TIA::set_player_graphic(int player, uint8_t value)
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{
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}
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void TIA::set_player_reflected(int player, bool reflected)
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{
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}
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void TIA::set_player_delay(int player, bool delay)
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{
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}
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void TIA::set_player_position(int player)
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{
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}
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void TIA::set_player_motion(int player, uint8_t motion)
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{
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}
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void TIA::set_player_missile_colour(int player, uint8_t colour)
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{
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}
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void TIA::set_missile_enable(int missile, bool enabled)
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{
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}
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void TIA::set_missile_position(int missile)
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{
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}
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void TIA::set_missile_position_to_player(int missile)
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{
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}
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void TIA::set_missile_motion(int missile, uint8_t motion)
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{
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}
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void TIA::set_ball_enable(bool enabled)
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{
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}
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void TIA::set_ball_delay(bool delay)
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{
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}
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void TIA::set_ball_position()
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{
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}
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void TIA::set_ball_motion(uint8_t motion)
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{
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}
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void TIA::move()
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{
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}
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void TIA::clear_motion()
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{
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}
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uint8_t TIA::get_collision_flags(int offset)
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{
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return 0xff;
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}
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void TIA::clear_collision_flags()
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{
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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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//
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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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void TIA::output_for_cycles(int number_of_cycles)
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{
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/*
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Line timing is oriented around 0 being the start of the right-hand side vertical blank;
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a wsync synchronises the CPU to horizontal_counter_ = 0. All timing below is in terms of the
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NTSC colour clock.
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Therefore, each line is composed of:
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16 cycles: blank ; -> 16
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16 cycles: sync ; -> 32
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16 cycles: colour burst ; -> 48
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20 cycles: blank ; -> 68
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8 cycles: blank or pixels, depending on whether the blank extend bit is set
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152 cycles: pixels
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*/
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horizontal_counter_ += number_of_cycles;
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if(!output_cursor_ && horizontal_counter_ >= 16)
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{
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crt_->output_blank(32);
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output_cursor_ = 16;
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}
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if(output_cursor_ == 16 && horizontal_counter_ >= 32)
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{
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crt_->output_sync(32);
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output_cursor_ = 32;
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}
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if(output_cursor_ == 32 && horizontal_counter_ >= 48)
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{
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crt_->output_default_colour_burst(32);
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output_cursor_ = 48;
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}
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if(output_cursor_ == 48 && horizontal_counter_ >= 68)
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{
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crt_->output_default_colour_burst(40);
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output_cursor_ = 68;
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}
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if(horizontal_counter_ > 68)
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{
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if(output_cursor_ == 68)
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{
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pixel_target_ = crt_->allocate_write_area(160);
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}
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if(pixel_target_)
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{
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while(output_cursor_ < horizontal_counter_)
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{
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pixel_target_[output_cursor_ - 68] = (output_cursor_&1) ? 0xff : 0x00;
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output_cursor_++;
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}
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} else output_cursor_ = horizontal_counter_;
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if(horizontal_counter_ == cycles_per_line)
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{
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crt_->output_data(320, 2);
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pixel_target_ = nullptr;
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}
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}
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horizontal_counter_ %= cycles_per_line;
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}
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void TIA::output_line()
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{
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// TODO: optimise special case
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output_for_cycles(cycles_per_line);
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}
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