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This commit is contained in:
Thomas Harte 2023-05-12 13:33:02 -04:00
parent 596661bfbe
commit c29d80006e
1 changed files with 27 additions and 19 deletions
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46
Components/9918/Implementation/Storage.hpp
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@ -34,26 +34,51 @@ template <Personality personality> struct Storage<personality, std::enable_if_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;
uint8_t vertical_offset_ = 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;
// Sprite collection state.
bool sprites_enabled_ = true;
// Additional status.
uint8_t colour_status_ = 0;
uint16_t colour_location_ = 0;
uint16_t collision_location_[2]{};
/// Describes an _observable_ memory access event. i.e. anything that it is safe
/// (and convenient) to treat as atomic in between external slots.
struct Event {
@ -90,23 +115,6 @@ template <Personality personality> struct Storage<personality, std::enable_if_t<
// State that tracks fetching position within a line.
const Event *next_event_ = nullptr;
// 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;
// Sprite collection state.
bool sprites_enabled_ = true;
// 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) {