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78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
//
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// LineLayout.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 18/05/2023.
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// Copyright © 2023 Thomas Harte. All rights reserved.
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//
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#pragma once
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namespace TI::TMS {
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template <Personality personality, typename Enable = void> struct LineLayout;
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// Line layout is:
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//
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// [0, EndOfSync] sync
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// (EndOfSync, StartOfColourBurst] blank
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// (StartOfColourBurst, EndOfColourBurst] colour burst
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// (EndOfColourBurst, EndOfLeftErase] blank
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// (EndOfLeftErase, EndOfLeftBorder] border colour
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// (EndOfLeftBorder, EndOfPixels] pixel content
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// (EndOfPixels, EndOfRightBorder] border colour
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// [EndOfRightBorder, <end of line>] blank
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//
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// ... with minor caveats:
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// * horizontal adjust on the Yamaha VDPs is applied to EndOfLeftBorder and EndOfPixels;
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// * the Sega VDPs may programatically extend the left border; and
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// * text mode on all VDPs adjusts border width.
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template <Personality personality> struct LineLayout<personality, std::enable_if_t<is_classic_vdp(personality)>> {
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constexpr static int StartOfSync = 0;
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constexpr static int EndOfSync = 26;
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constexpr static int StartOfColourBurst = 29;
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constexpr static int EndOfColourBurst = 43;
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constexpr static int EndOfLeftErase = 50;
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constexpr static int EndOfLeftBorder = 63;
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constexpr static int EndOfPixels = 319;
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constexpr static int EndOfRightBorder = 334;
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constexpr static int CyclesPerLine = 342;
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constexpr static int TextModeEndOfLeftBorder = 69;
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constexpr static int TextModeEndOfPixels = 309;
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constexpr static int ModeLatchCycle = 36; // Just a guess; correlates with the known 144 for the Yamaha VDPs,
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// and falls into the collection gap between the final sprite
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// graphics and the initial tiles or pixels.
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/// The number of internal cycles that must elapse between a request to read or write and
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/// it becoming a candidate for action.
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constexpr static int VRAMAccessDelay = 6;
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};
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template <Personality personality> struct LineLayout<personality, std::enable_if_t<is_yamaha_vdp(personality)>> {
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constexpr static int StartOfSync = 0;
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constexpr static int EndOfSync = 100;
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constexpr static int StartOfColourBurst = 113;
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constexpr static int EndOfColourBurst = 167;
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constexpr static int EndOfLeftErase = 202;
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constexpr static int EndOfLeftBorder = 258;
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constexpr static int EndOfPixels = 1282;
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constexpr static int EndOfRightBorder = 1341;
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constexpr static int CyclesPerLine = 1368;
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constexpr static int TextModeEndOfLeftBorder = 294;
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constexpr static int TextModeEndOfPixels = 1254;
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constexpr static int ModeLatchCycle = 144;
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/// The number of internal cycles that must elapse between a request to read or write and
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/// it becoming a candidate for action.
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constexpr static int VRAMAccessDelay = 16;
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};
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}
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