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112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
//
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// AccessEnums.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 26/01/2023.
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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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// The screen mode is a necessary predecessor to picking the line mode,
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// which is the thing latched per line.
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enum class ScreenMode {
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// Original TMS modes.
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Blank,
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Text,
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MultiColour,
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ColouredText,
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Graphics,
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// 8-bit Sega modes.
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SMSMode4,
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// New Yamaha V9938 modes.
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YamahaText80,
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YamahaGraphics3,
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YamahaGraphics4,
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YamahaGraphics5,
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YamahaGraphics6,
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YamahaGraphics7,
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// Rebranded Yamaha V9938 modes.
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YamahaGraphics1 = ColouredText,
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YamahaGraphics2 = Graphics,
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};
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constexpr int pixels_per_byte(ScreenMode mode) {
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switch(mode) {
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default:
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case ScreenMode::Blank: return 1;
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case ScreenMode::Text: return 6;
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case ScreenMode::MultiColour: return 2;
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case ScreenMode::ColouredText: return 8;
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case ScreenMode::Graphics: return 8;
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case ScreenMode::SMSMode4: return 2;
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case ScreenMode::YamahaText80: return 6;
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case ScreenMode::YamahaGraphics3: return 8;
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case ScreenMode::YamahaGraphics4: return 2;
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case ScreenMode::YamahaGraphics5: return 4;
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case ScreenMode::YamahaGraphics6: return 2;
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case ScreenMode::YamahaGraphics7: return 1;
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}
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}
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constexpr int width(ScreenMode mode) {
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switch(mode) {
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default:
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case ScreenMode::Blank: return 0;
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case ScreenMode::Text: return 240;
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case ScreenMode::MultiColour: return 256;
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case ScreenMode::ColouredText: return 256;
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case ScreenMode::Graphics: return 256;
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case ScreenMode::SMSMode4: return 256;
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case ScreenMode::YamahaText80: return 480;
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case ScreenMode::YamahaGraphics3: return 256;
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case ScreenMode::YamahaGraphics4: return 256;
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case ScreenMode::YamahaGraphics5: return 512;
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case ScreenMode::YamahaGraphics6: return 512;
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case ScreenMode::YamahaGraphics7: return 256;
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}
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}
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constexpr bool interleaves_banks(ScreenMode mode) {
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return mode == ScreenMode::YamahaGraphics6 || mode == ScreenMode::YamahaGraphics7;
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}
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constexpr bool is_text(ScreenMode mode) {
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return mode == ScreenMode::Text || mode == ScreenMode::YamahaText80;
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}
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enum class FetchMode {
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Text,
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Character,
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Refresh,
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SMS,
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Yamaha,
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};
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enum class MemoryAccess {
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Read, Write, None
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};
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enum class VerticalState {
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/// Describes any line on which pixels do not appear and no fetching occurs, including
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/// the border, blanking and sync.
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Blank,
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/// A line on which pixels do not appear but fetching occurs.
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Prefetch,
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/// A line on which pixels appear and fetching occurs.
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Pixels,
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};
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enum class SpriteMode {
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Mode1,
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Mode2,
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MasterSystem,
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};
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}
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