CLK/Machines/Atari2600/TIA.cpp

//
//  TIA.cpp
//  Clock Signal
//
//  Created by Thomas Harte on 28/01/2017.
//  Copyright © 2017 Thomas Harte. All rights reserved.
//

#include "TIA.hpp"

using namespace Atari2600;

TIA::TIA()
{
/*
	crt_.reset(new Outputs::CRT::CRT(228, 1, 263, Outputs::CRT::ColourSpace::YIQ, 228, 1, false, 1));
	crt_->set_output_device(Outputs::CRT::Television);

	// this is the NTSC phase offset function; see below for PAL
	crt_->set_composite_sampling_function(
		"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
		"{"
			"uint c = texture(texID, coordinate).r;"
			"uint y = c & 14u;"
			"uint iPhase = (c >> 4);"

			"float phaseOffset = 6.283185308 * float(iPhase) / 13.0  + 5.074880441076923;"
			"return mix(float(y) / 14.0, step(1, iPhase) * cos(phase + phaseOffset), amplitude);"
		"}");
	speaker_->set_input_rate((float)(get_clock_rate() / 38.0));*/
}

/*void Machine::switch_region()
{
	// the PAL function
	crt_->set_composite_sampling_function(
		"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
		"{"
			"uint c = texture(texID, coordinate).r;"
			"uint y = c & 14u;"
			"uint iPhase = (c >> 4);"

			"uint direction = iPhase & 1u;"
			"float phaseOffset = float(7u - direction) + (float(direction) - 0.5) * 2.0 * float(iPhase >> 1);"
			"phaseOffset *= 6.283185308 / 12.0;"
			"return mix(float(y) / 14.0, step(4, (iPhase + 2u) & 15u) * cos(phase + phaseOffset), amplitude);"
		"}");

	crt_->set_new_timing(228, 312, Outputs::CRT::ColourSpace::YUV, 228, 1, true);

	is_pal_region_ = true;
	speaker_->set_input_rate((float)(get_clock_rate() / 38.0));
	set_clock_rate(PAL_clock_rate);
}*/

						// 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