mirror of
https://github.com/TomHarte/CLK.git
synced 2024-06-25 18:30:07 +00:00
92 lines
1.8 KiB
C++
92 lines
1.8 KiB
C++
//
|
|
// AccessEnums.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 26/01/2023.
|
|
// Copyright © 2023 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef AccessEnums_hpp
|
|
#define AccessEnums_hpp
|
|
|
|
|
|
namespace TI {
|
|
namespace TMS {
|
|
|
|
// The screen mode is a necessary predecessor to picking the line mode,
|
|
// which is the thing latched per line.
|
|
enum class ScreenMode {
|
|
// Original TMS modes.
|
|
Blank,
|
|
Text,
|
|
MultiColour,
|
|
ColouredText,
|
|
Graphics,
|
|
|
|
// 8-bit Sega modes.
|
|
SMSMode4,
|
|
|
|
// New Yamaha V9938 modes.
|
|
YamahaText80,
|
|
YamahaGraphics3,
|
|
YamahaGraphics4,
|
|
YamahaGraphics5,
|
|
YamahaGraphics6,
|
|
YamahaGraphics7,
|
|
|
|
// Rebranded Yamaha V9938 modes.
|
|
YamahaGraphics1 = ColouredText,
|
|
YamahaGraphics2 = Graphics,
|
|
};
|
|
|
|
constexpr int pixels_per_byte(ScreenMode mode) {
|
|
switch(mode) {
|
|
default:
|
|
case ScreenMode::Blank: return 1;
|
|
case ScreenMode::Text: return 6;
|
|
case ScreenMode::MultiColour: return 2;
|
|
case ScreenMode::ColouredText: return 8;
|
|
case ScreenMode::Graphics: return 8;
|
|
case ScreenMode::SMSMode4: return 2;
|
|
case ScreenMode::YamahaText80: return 6;
|
|
case ScreenMode::YamahaGraphics3: return 8;
|
|
case ScreenMode::YamahaGraphics4: return 2;
|
|
case ScreenMode::YamahaGraphics5: return 4;
|
|
case ScreenMode::YamahaGraphics6: return 2;
|
|
case ScreenMode::YamahaGraphics7: return 1;
|
|
}
|
|
}
|
|
|
|
enum class FetchMode {
|
|
Text,
|
|
Character,
|
|
Refresh,
|
|
SMS,
|
|
Yamaha,
|
|
};
|
|
|
|
enum class MemoryAccess {
|
|
Read, Write, None
|
|
};
|
|
|
|
enum class VerticalState {
|
|
/// Describes any line on which pixels do not appear and no fetching occurs, including
|
|
/// the border, blanking and sync.
|
|
Blank,
|
|
/// A line on which pixels do not appear but fetching occurs.
|
|
Prefetch,
|
|
/// A line on which pixels appear and fetching occurs.
|
|
Pixels,
|
|
};
|
|
|
|
enum class SpriteMode {
|
|
Mode1,
|
|
Mode2,
|
|
MasterSystem,
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* AccessEnums_hpp */
|