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Expand Yamaha graphics mode recognition.

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This commit is contained in:
Thomas Harte 2023-01-21 14:35:26 -05:00
parent d1f929e6f7
commit cefcc1d443
2 changed files with 57 additions and 1 deletions
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24
Components/9918/Implementation/9918.cpp
View File

@ -285,7 +285,16 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
next_line_buffer.line_mode = LineMode::SMS;
this->mode_timing_.maximum_visible_sprites = 8;
break;
case ScreenMode::YamahaGraphics3:
case ScreenMode::YamahaGraphics4:
case ScreenMode::YamahaGraphics5:
case ScreenMode::YamahaGraphics6:
case ScreenMode::YamahaGraphics7:
// TODO: actual line modes.
next_line_buffer.line_mode = LineMode::Refresh;
break;
default:
// This covers both MultiColour and Graphics modes.
next_line_buffer.line_mode = LineMode::Character;
break;
}
@ -431,6 +440,8 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
case LineMode::Character: draw(draw_tms_character(relative_start, relative_end), Clock::TMSPixel); break;
case LineMode::Text: draw(draw_tms_text(relative_start, relative_end), Clock::TMSPixel); break;
// TODO: Yamaha line modes.
case LineMode::Refresh: break; /* Dealt with elsewhere. */
}
}
@ -653,6 +664,11 @@ void Base<personality>::commit_register(int reg, uint8_t value) {
default: break;
case 0:
Storage<personality>::mode_ = uint8_t(
(Storage<personality>::mode_ & 3) |
((value & 0xe) << 1)
);
LOG("TODO: Yamaha additional mode selection; " << PADHEX(2) << +value);
// b1–b3: M3–M5
// b4: enable horizontal retrace interrupt
@ -660,6 +676,14 @@ void Base<personality>::commit_register(int reg, uint8_t value) {
// b6: set colour bus to input or output mode
break;
case 1:
Storage<personality>::mode_ = uint8_t(
(Storage<personality>::mode_ & 0x1c) |
((value & 0x10) >> 4) |
((value & 0x08) >> 2)
);
break;
case 8:
LOG("TODO: Yamaha VRAM organisation, sprite disable, etc; " << PADHEX(2) << +value);
// b7: "1 = input on colour bus, enable mouse; 1 = output on colour bus, disable mouse" [documentation clearly in error]

34
Components/9918/Implementation/9918Base.hpp
View File

@ -30,12 +30,27 @@ 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,
SMSMode4
// 8-bit Sega modes.
SMSMode4,
// New Yamaha V9938 modes.
YamahaText80,
YamahaGraphics3,
YamahaGraphics4,
YamahaGraphics5,
YamahaGraphics6,
YamahaGraphics7,
// Rebranded Yamaha V9938 modes.
YamahaGraphics1 = ColouredText,
YamahaGraphics2 = Graphics,
};
enum class LineMode {
@ -135,6 +150,8 @@ template <Personality personality> struct Storage<personality, std::enable_if_t<
uint32_t palette_[16]{};
uint8_t new_colour_ = 0;
uint8_t palette_entry_ = 0;
uint8_t mode_ = 0;
};
// Master System-specific storage.
@ -336,6 +353,21 @@ template <Personality personality> struct Base: public Storage<personality> {
}
}
if constexpr (is_yamaha_vdp(personality)) {
switch(Storage<personality>::mode_) {
case 0b00001: return ScreenMode::Text;
case 0b01001: return ScreenMode::YamahaText80;
case 0b00010: return ScreenMode::MultiColour;
case 0b00000: return ScreenMode::YamahaGraphics1;
case 0b00100: return ScreenMode::YamahaGraphics2;
case 0b01000: return ScreenMode::YamahaGraphics3;
case 0b01100: return ScreenMode::YamahaGraphics4;
case 0b10000: return ScreenMode::YamahaGraphics5;
case 0b10100: return ScreenMode::YamahaGraphics6;
case 0b11100: return ScreenMode::YamahaGraphics7;
}
}
if(!mode1_enable_ && !mode2_enable_ && !mode3_enable_) {
return ScreenMode::ColouredText;
}