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Also sever command-engine state.

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This commit is contained in:
Thomas Harte 2023-05-12 13:57:50 -04:00
parent abeb361441
commit 5bcb5fb832
1 changed files with 78 additions and 96 deletions
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174
Components/9918/Implementation/Storage.hpp
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@ -293,81 +293,7 @@ struct YamahaFetcher {
};
};
// Yamaha-specific storage.
template <Personality personality> struct Storage<personality, std::enable_if_t<is_yamaha_vdp(personality)>>: public YamahaFetcher {
using AddressT = uint32_t;
std::array<uint8_t, 65536> expansion_ram_;
// Register indirections.
int selected_status_ = 0;
int indirect_register_ = 0;
bool increment_indirect_register_ = false;
// Output horizontal and vertical adjustment, plus the selected vertical offset (i.e. hardware scroll).
int adjustment_[2]{};
uint8_t vertical_offset_ = 0;
// The palette, plus a shadow copy in which colour 0 is not the current palette colour 0,
// but is rather the current global background colour. This simplifies flow when colour 0
// is set as transparent.
std::array<uint32_t, 16> palette_{};
std::array<uint32_t, 16> background_palette_{};
bool solid_background_ = true;
// Transient state for palette setting.
uint8_t new_colour_ = 0;
uint8_t palette_entry_ = 0;
bool palette_write_phase_ = false;
// Recepticle for all five bits of the current screen mode.
uint8_t mode_ = 0;
// Used ephemerally during drawing to compound sprites with the 'CC'
// (compound colour?) bit set.
uint8_t sprite_cache_[8][32]{};
// Text blink colours.
uint8_t blink_text_colour_ = 0;
uint8_t blink_background_colour_ = 0;
// Blink state (which is also affects even/odd page display in applicable modes).
int in_blink_ = 1;
uint8_t blink_periods_ = 0;
uint8_t blink_counter_ = 0;
// Additional status.
uint8_t colour_status_ = 0;
uint16_t colour_location_ = 0;
uint16_t collision_location_[2]{};
/// Resets line-ephemeral state for a new line.
void begin_line(ScreenMode mode, bool is_refresh) {
if(is_refresh) {
next_event_ = refresh_events.data();
return;
}
switch(mode) {
case ScreenMode::YamahaText80:
case ScreenMode::Text:
next_event_ = text_events.data();
break;
case ScreenMode::MultiColour:
case ScreenMode::YamahaGraphics1:
case ScreenMode::YamahaGraphics2:
next_event_ = character_events.data();
break;
case ScreenMode::YamahaGraphics3: // TODO: verify; my guess is that G3 is timed like a bitmap mode
// in order to fit the pattern for sprite mode 2. Just a guess.
default:
next_event_ = sprites_enabled_ ? sprites_events.data() : no_sprites_events.data();
break;
}
}
struct YamahaCommandState {
// Command engine state.
CommandContext command_context_;
ModeDescription mode_description_;
@ -426,32 +352,88 @@ template <Personality personality> struct Storage<personality, std::enable_if_t<
break;
}
}
};
// Yamaha-specific storage.
template <Personality personality> struct Storage<personality, std::enable_if_t<is_yamaha_vdp(personality)>>: public YamahaFetcher, public YamahaCommandState {
using AddressT = uint32_t;
std::array<uint8_t, 65536> expansion_ram_;
// Register indirections.
int selected_status_ = 0;
int indirect_register_ = 0;
bool increment_indirect_register_ = false;
// Output horizontal and vertical adjustment, plus the selected vertical offset (i.e. hardware scroll).
int adjustment_[2]{};
uint8_t vertical_offset_ = 0;
// The palette, plus a shadow copy in which colour 0 is not the current palette colour 0,
// but is rather the current global background colour. This simplifies flow when colour 0
// is set as transparent.
std::array<uint32_t, 16> palette_{};
std::array<uint32_t, 16> background_palette_{};
bool solid_background_ = true;
// Transient state for palette setting.
uint8_t new_colour_ = 0;
uint8_t palette_entry_ = 0;
bool palette_write_phase_ = false;
// Recepticle for all five bits of the current screen mode.
uint8_t mode_ = 0;
// Used ephemerally during drawing to compound sprites with the 'CC'
// (compound colour?) bit set.
uint8_t sprite_cache_[8][32]{};
// Text blink colours.
uint8_t blink_text_colour_ = 0;
uint8_t blink_background_colour_ = 0;
// Blink state (which is also affects even/odd page display in applicable modes).
int in_blink_ = 1;
uint8_t blink_periods_ = 0;
uint8_t blink_counter_ = 0;
// Additional things exposed by status registers.
uint8_t colour_status_ = 0;
uint16_t colour_location_ = 0;
uint16_t collision_location_[2]{};
Storage() noexcept {
// Perform sanity checks on the event lists.
#ifndef NDEBUG
const Event *lists[] = { no_sprites_events.data(), sprites_events.data(), text_events.data(), character_events.data(), refresh_events.data(), nullptr };
const Event **list = lists;
while(*list) {
const Event *cursor = *list;
++list;
while(cursor[1].offset != 1368) {
assert(cursor[1].offset > cursor[0].offset);
++cursor;
}
}
#endif
// Seed to _something_ meaningful.
//
// TODO: this is a workaround [/hack], in effect, for the main TMS' habit of starting
// in a randomised position, which means that start-of-line isn't announced.
//
// Do I really want that behaviour?
// Seed to something valid.
next_event_ = refresh_events.data();
}
/// Resets line-ephemeral state for a new line.
void begin_line(ScreenMode mode, bool is_refresh) {
if(is_refresh) {
next_event_ = refresh_events.data();
return;
}
switch(mode) {
case ScreenMode::YamahaText80:
case ScreenMode::Text:
next_event_ = text_events.data();
break;
case ScreenMode::MultiColour:
case ScreenMode::YamahaGraphics1:
case ScreenMode::YamahaGraphics2:
next_event_ = character_events.data();
break;
case ScreenMode::YamahaGraphics3: // TODO: verify; my guess is that G3 is timed like a bitmap mode
// in order to fit the pattern for sprite mode 2. Just a guess.
default:
next_event_ = sprites_enabled_ ? sprites_events.data() : no_sprites_events.data();
break;
}
}
private:
static constexpr auto refresh_events = events<RefreshGenerator>();
static constexpr auto no_sprites_events = events<BitmapGenerator<false>>();