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Start to cleave off Yamaha fetch tables.

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This commit is contained in:
Thomas Harte 2023-05-12 13:49:53 -04:00
parent e7c40eead9
commit f9cc2013a8
1 changed files with 42 additions and 40 deletions
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82
Components/9918/Implementation/Storage.hpp
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@ -28,8 +28,49 @@ template <> struct Storage<Personality::TMS9918A> {
void begin_line(ScreenMode, bool) {}
};
struct YamahaFetcher {
/// 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 {
/// Offset of the _beginning_ of the event. Not completely arbitrarily: this is when
/// external data must be ready by in order to take part in those slots.
uint16_t offset = 1368;
enum class Type: uint8_t {
/// A slot for reading or writing data on behalf of the CPU or the command engine.
External,
//
// Sprites.
//
SpriteY,
SpriteLocation,
SpritePattern,
//
// Backgrounds.
//
Name,
Colour,
Pattern,
} type = Type::External;
uint8_t id = 0;
constexpr Event(Type type, uint8_t id = 0) noexcept :
type(type),
id(id) {}
constexpr Event() noexcept {}
};
// State that tracks fetching position within a line.
const Event *next_event_ = nullptr;
// Sprite collection state.
bool sprites_enabled_ = true;
};
// Yamaha-specific storage.
template <Personality personality> struct Storage<personality, std::enable_if_t<is_yamaha_vdp(personality)>> {
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_;
@ -71,50 +112,11 @@ template <Personality personality> struct Storage<personality, std::enable_if_t<
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 {
/// Offset of the _beginning_ of the event. Not completely arbitrarily: this is when
/// external data must be ready by in order to take part in those slots.
uint16_t offset = 1368;
enum class Type: uint8_t {
/// A slot for reading or writing data on behalf of the CPU or the command engine.
External,
//
// Sprites.
//
SpriteY,
SpriteLocation,
SpritePattern,
//
// Backgrounds.
//
Name,
Colour,
Pattern,
} type = Type::External;
uint8_t id = 0;
constexpr Event(Type type, uint8_t id = 0) noexcept :
type(type),
id(id) {}
constexpr Event() noexcept {}
};
// State that tracks fetching position within a line.
const Event *next_event_ = nullptr;
/// Resets line-ephemeral state for a new line.
void begin_line(ScreenMode mode, bool is_refresh) {
if(is_refresh) {