6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2025-08-07 23:25:00 +00:00
Code Issues Projects Releases Wiki Activity

Gift all generators to YamahaFetcher.

Browse Source
This commit is contained in:
Thomas Harte
2023-05-12 13:54:07 -04:00
parent f9cc2013a8
commit abeb361441
1 changed files with 256 additions and 251 deletions
Download Patch File Download Diff File Expand all files Collapse all files

507
Components/9918/Implementation/Storage.hpp
View File

@@ -29,44 +29,268 @@ template <> struct Storage<Personality::TMS9918A> {
}; };
struct YamahaFetcher { struct YamahaFetcher {
/// Describes an _observable_ memory access event. i.e. anything that it is safe public:
/// (and convenient) to treat as atomic in between external slots. /// Describes an _observable_ memory access event. i.e. anything that it is safe
struct Event { /// (and convenient) to treat as atomic in between external slots.
/// Offset of the _beginning_ of the event. Not completely arbitrarily: this is when struct Event {
/// external data must be ready by in order to take part in those slots. /// Offset of the _beginning_ of the event. Not completely arbitrarily: this is when
uint16_t offset = 1368; /// external data must be ready by in order to take part in those slots.
enum class Type: uint8_t { uint16_t offset = 1368;
/// A slot for reading or writing data on behalf of the CPU or the command engine. enum class Type: uint8_t {
External, /// A slot for reading or writing data on behalf of the CPU or the command engine.
External,
// //
// Sprites. // Sprites.
// //
SpriteY, SpriteY,
SpriteLocation, SpriteLocation,
SpritePattern, SpritePattern,
// //
// Backgrounds. // Backgrounds.
// //
Name, Name,
Colour, Colour,
Pattern, Pattern,
} type = Type::External; } type = Type::External;
uint8_t id = 0; uint8_t id = 0;
constexpr Event(Type type, uint8_t id = 0) noexcept : constexpr Event(Type type, uint8_t id = 0) noexcept :
type(type), type(type),
id(id) {} id(id) {}
constexpr Event() noexcept {} constexpr Event() noexcept {}
}; };
// State that tracks fetching position within a line. // State that tracks fetching position within a line.
const Event *next_event_ = nullptr; const Event *next_event_ = nullptr;
// Sprite collection state. // Sprite collection state.
bool sprites_enabled_ = true; bool sprites_enabled_ = true;
protected:
/// @return 1 + the number of times within a line that @c GeneratorT produces an event.
template <typename GeneratorT> static constexpr size_t events_size() {
size_t size = 0;
for(int c = 0; c < 1368; c++) {
const auto event_type = GeneratorT::event(c);
size += event_type.has_value();
}
return size + 1;
}
/// @return An array of all events generated by @c GeneratorT in line order.
template <typename GeneratorT, size_t size = events_size<GeneratorT>()>
static constexpr std::array<Event, size> events() {
std::array<Event, size> result{};
size_t index = 0;
for(int c = 0; c < 1368; c++) {
const auto event = GeneratorT::event(c);
if(!event) {
continue;
}
result[index] = *event;
result[index].offset = uint16_t(c);
++index;
}
result[index] = Event();
return result;
}
struct StandardGenerators {
static constexpr std::optional<Event> external_every_eight(int index) {
if(index & 7) return std::nullopt;
return Event::Type::External;
}
};
struct RefreshGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
// From 0 to 126: CPU/CMD slots at every cycle divisible by 8.
if(grauw_index < 126) {
return StandardGenerators::external_every_eight(grauw_index - 0);
}
// From 164 to 1234: eight-cycle windows, the first 15 of each 16 being
// CPU/CMD and the final being refresh.
if(grauw_index >= 164 && grauw_index < 1234) {
const int offset = grauw_index - 164;
if(offset & 7) return std::nullopt;
if(((offset >> 3) & 15) == 15) return std::nullopt;
return Event::Type::External;
}
// From 1268 to 1330: CPU/CMD slots at every cycle divisible by 8.
if(grauw_index >= 1268 && grauw_index < 1330) {
return StandardGenerators::external_every_eight(grauw_index - 1268);
}
// A CPU/CMD at 1334.
if(grauw_index == 1334) {
return Event::Type::External;
}
// From 1344 to 1366: CPU/CMD slots every cycle divisible by 8.
if(grauw_index >= 1344 && grauw_index < 1366) {
return StandardGenerators::external_every_eight(grauw_index - 1344);
}
// Otherwise: nothing.
return std::nullopt;
}
};
template <bool include_sprites> struct BitmapGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
if(!include_sprites) {
// Various standard zones of one-every-eight external slots.
if(grauw_index < 124) {
return StandardGenerators::external_every_eight(grauw_index + 2);
}
if(grauw_index > 1266) {
return StandardGenerators::external_every_eight(grauw_index - 1266);
}
} else {
// This records collection points for all data for selected sprites.
// There's only four of them (each site covering two sprites),
// so it's clearer just to be explicit.
//
// There's also a corresponding number of extra external slots to spell out.
switch(grauw_index) {
default: break;
case 1238: return Event(Event::Type::SpriteLocation, 0);
case 1302: return Event(Event::Type::SpriteLocation, 2);
case 2: return Event(Event::Type::SpriteLocation, 4);
case 66: return Event(Event::Type::SpriteLocation, 6);
case 1270: return Event(Event::Type::SpritePattern, 0);
case 1338: return Event(Event::Type::SpritePattern, 2);
case 34: return Event(Event::Type::SpritePattern, 4);
case 98: return Event(Event::Type::SpritePattern, 6);
case 1264: case 1330: case 28: case 92:
return Event::Type::External;
}
}
if(grauw_index >= 162 && grauw_index < 176) {
return StandardGenerators::external_every_eight(grauw_index - 162);
}
// Everywhere else the pattern is:
//
// external or sprite y, external, data block
//
// Subject to caveats:
//
// 1) the first data block is just a dummy fetch with no side effects,
// so this emulator declines to record it; and
// 2) every fourth block, the second external is actually a refresh.
//
if(grauw_index >= 182 && grauw_index < 1238) {
const int offset = grauw_index - 182;
const int block = offset / 32;
const int sub_block = offset & 31;
switch(sub_block) {
default: return std::nullopt;
case 0:
if(include_sprites) {
// Don't include the sprite post-amble (i.e. a spurious read with no side effects).
if(block < 32) {
return Event(Event::Type::SpriteY, uint8_t(block));
}
} else {
return Event::Type::External;
}
case 6:
if((block & 3) != 3) {
return Event::Type::External;
}
break;
case 12:
if(block) {
return Event(Event::Type::Pattern, uint8_t(block - 1));
}
break;
}
}
return std::nullopt;
}
};
struct TextGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
// Capture various one-in-eight zones.
if(grauw_index < 72) {
return StandardGenerators::external_every_eight(grauw_index - 2);
}
if(grauw_index >= 166 && grauw_index < 228) {
return StandardGenerators::external_every_eight(grauw_index - 166);
}
if(grauw_index >= 1206 && grauw_index < 1332) {
return StandardGenerators::external_every_eight(grauw_index - 1206);
}
if(grauw_index == 1336) {
return Event::Type::External;
}
if(grauw_index >= 1346) {
return StandardGenerators::external_every_eight(grauw_index - 1346);
}
// Elsewhere...
if(grauw_index >= 246) {
const int offset = grauw_index - 246;
const int block = offset / 48;
const int sub_block = offset % 48;
switch(sub_block) {
default: break;
case 0: return Event(Event::Type::Name, uint8_t(block));
case 18: return (block & 1) ? Event::Type::External : Event(Event::Type::Colour, uint8_t(block >> 1));
case 24: return Event(Event::Type::Pattern, uint8_t(block));
}
}
return std::nullopt;
}
};
struct CharacterGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
// Grab sprite events.
switch(grauw_index) {
default: break;
case 1242: return Event(Event::Type::SpriteLocation, 0);
case 1306: return Event(Event::Type::SpriteLocation, 1);
case 6: return Event(Event::Type::SpriteLocation, 2);
case 70: return Event(Event::Type::SpriteLocation, 3);
case 1274: return Event(Event::Type::SpritePattern, 0);
case 1342: return Event(Event::Type::SpritePattern, 1);
case 38: return Event(Event::Type::SpritePattern, 2);
case 102: return Event(Event::Type::SpritePattern, 3);
case 1268: case 1334: case 32: case 96: return Event::Type::External;
}
if(grauw_index >= 166 && grauw_index < 180) {
return StandardGenerators::external_every_eight(grauw_index - 166);
}
if(grauw_index >= 182 && grauw_index < 1238) {
const int offset = grauw_index - 182;
const int block = offset / 32;
const int sub_block = offset & 31;
switch(sub_block) {
case 0: if(block > 0) return Event(Event::Type::Name, uint8_t(block - 1));
case 6: if((sub_block & 3) != 3) return Event::Type::External;
case 12: if(block < 32) return Event(Event::Type::SpriteY, uint8_t(block));
case 18: if(block > 0) return Event(Event::Type::Pattern, uint8_t(block - 1));
case 24: if(block > 0) return Event(Event::Type::Colour, uint8_t(block - 1));
}
}
return std::nullopt;
}
};
}; };
// Yamaha-specific storage. // Yamaha-specific storage.
@@ -229,229 +453,10 @@ template <Personality personality> struct Storage<personality, std::enable_if_t<
} }
private: private:
template <typename GeneratorT> static constexpr size_t events_size() {
size_t size = 0;
for(int c = 0; c < 1368; c++) {
const auto event_type = GeneratorT::event(c);
size += event_type.has_value();
}
return size + 1;
}
template <typename GeneratorT, size_t size = events_size<GeneratorT>()>
static constexpr std::array<Event, size> events() {
std::array<Event, size> result{};
size_t index = 0;
for(int c = 0; c < 1368; c++) {
const auto event = GeneratorT::event(c);
if(!event) {
continue;
}
result[index] = *event;
result[index].offset = uint16_t(c);
++index;
}
result[index] = Event();
return result;
}
struct StandardGenerators {
static constexpr std::optional<Event> external_every_eight(int index) {
if(index & 7) return std::nullopt;
return Event::Type::External;
}
};
struct RefreshGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
// From 0 to 126: CPU/CMD slots at every cycle divisible by 8.
if(grauw_index < 126) {
return StandardGenerators::external_every_eight(grauw_index - 0);
}
// From 164 to 1234: eight-cycle windows, the first 15 of each 16 being
// CPU/CMD and the final being refresh.
if(grauw_index >= 164 && grauw_index < 1234) {
const int offset = grauw_index - 164;
if(offset & 7) return std::nullopt;
if(((offset >> 3) & 15) == 15) return std::nullopt;
return Event::Type::External;
}
// From 1268 to 1330: CPU/CMD slots at every cycle divisible by 8.
if(grauw_index >= 1268 && grauw_index < 1330) {
return StandardGenerators::external_every_eight(grauw_index - 1268);
}
// A CPU/CMD at 1334.
if(grauw_index == 1334) {
return Event::Type::External;
}
// From 1344 to 1366: CPU/CMD slots every cycle divisible by 8.
if(grauw_index >= 1344 && grauw_index < 1366) {
return StandardGenerators::external_every_eight(grauw_index - 1344);
}
// Otherwise: nothing.
return std::nullopt;
}
};
static constexpr auto refresh_events = events<RefreshGenerator>(); static constexpr auto refresh_events = events<RefreshGenerator>();
template <bool include_sprites> struct BitmapGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
if(!include_sprites) {
// Various standard zones of one-every-eight external slots.
if(grauw_index < 124) {
return StandardGenerators::external_every_eight(grauw_index + 2);
}
if(grauw_index > 1266) {
return StandardGenerators::external_every_eight(grauw_index - 1266);
}
} else {
// This records collection points for all data for selected sprites.
// There's only four of them (each site covering two sprites),
// so it's clearer just to be explicit.
//
// There's also a corresponding number of extra external slots to spell out.
switch(grauw_index) {
default: break;
case 1238: return Event(Event::Type::SpriteLocation, 0);
case 1302: return Event(Event::Type::SpriteLocation, 2);
case 2: return Event(Event::Type::SpriteLocation, 4);
case 66: return Event(Event::Type::SpriteLocation, 6);
case 1270: return Event(Event::Type::SpritePattern, 0);
case 1338: return Event(Event::Type::SpritePattern, 2);
case 34: return Event(Event::Type::SpritePattern, 4);
case 98: return Event(Event::Type::SpritePattern, 6);
case 1264: case 1330: case 28: case 92:
return Event::Type::External;
}
}
if(grauw_index >= 162 && grauw_index < 176) {
return StandardGenerators::external_every_eight(grauw_index - 162);
}
// Everywhere else the pattern is:
//
// external or sprite y, external, data block
//
// Subject to caveats:
//
// 1) the first data block is just a dummy fetch with no side effects,
// so this emulator declines to record it; and
// 2) every fourth block, the second external is actually a refresh.
//
if(grauw_index >= 182 && grauw_index < 1238) {
const int offset = grauw_index - 182;
const int block = offset / 32;
const int sub_block = offset & 31;
switch(sub_block) {
default: return std::nullopt;
case 0:
if(include_sprites) {
// Don't include the sprite post-amble (i.e. a spurious read with no side effects).
if(block < 32) {
return Event(Event::Type::SpriteY, uint8_t(block));
}
} else {
return Event::Type::External;
}
case 6:
if((block & 3) != 3) {
return Event::Type::External;
}
break;
case 12:
if(block) {
return Event(Event::Type::Pattern, uint8_t(block - 1));
}
break;
}
}
return std::nullopt;
}
};
static constexpr auto no_sprites_events = events<BitmapGenerator<false>>(); static constexpr auto no_sprites_events = events<BitmapGenerator<false>>();
static constexpr auto sprites_events = events<BitmapGenerator<true>>(); static constexpr auto sprites_events = events<BitmapGenerator<true>>();
struct TextGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
// Capture various one-in-eight zones.
if(grauw_index < 72) {
return StandardGenerators::external_every_eight(grauw_index - 2);
}
if(grauw_index >= 166 && grauw_index < 228) {
return StandardGenerators::external_every_eight(grauw_index - 166);
}
if(grauw_index >= 1206 && grauw_index < 1332) {
return StandardGenerators::external_every_eight(grauw_index - 1206);
}
if(grauw_index == 1336) {
return Event::Type::External;
}
if(grauw_index >= 1346) {
return StandardGenerators::external_every_eight(grauw_index - 1346);
}
// Elsewhere...
if(grauw_index >= 246) {
const int offset = grauw_index - 246;
const int block = offset / 48;
const int sub_block = offset % 48;
switch(sub_block) {
default: break;
case 0: return Event(Event::Type::Name, uint8_t(block));
case 18: return (block & 1) ? Event::Type::External : Event(Event::Type::Colour, uint8_t(block >> 1));
case 24: return Event(Event::Type::Pattern, uint8_t(block));
}
}
return std::nullopt;
}
};
static constexpr auto text_events = events<TextGenerator>(); static constexpr auto text_events = events<TextGenerator>();
struct CharacterGenerator {
static constexpr std::optional<Event> event(int grauw_index) {
// Grab sprite events.
switch(grauw_index) {
default: break;
case 1242: return Event(Event::Type::SpriteLocation, 0);
case 1306: return Event(Event::Type::SpriteLocation, 1);
case 6: return Event(Event::Type::SpriteLocation, 2);
case 70: return Event(Event::Type::SpriteLocation, 3);
case 1274: return Event(Event::Type::SpritePattern, 0);
case 1342: return Event(Event::Type::SpritePattern, 1);
case 38: return Event(Event::Type::SpritePattern, 2);
case 102: return Event(Event::Type::SpritePattern, 3);
case 1268: case 1334: case 32: case 96: return Event::Type::External;
}
if(grauw_index >= 166 && grauw_index < 180) {
return StandardGenerators::external_every_eight(grauw_index - 166);
}
if(grauw_index >= 182 && grauw_index < 1238) {
const int offset = grauw_index - 182;
const int block = offset / 32;
const int sub_block = offset & 31;
switch(sub_block) {
case 0: if(block > 0) return Event(Event::Type::Name, uint8_t(block - 1));
case 6: if((sub_block & 3) != 3) return Event::Type::External;
case 12: if(block < 32) return Event(Event::Type::SpriteY, uint8_t(block));
case 18: if(block > 0) return Event(Event::Type::Pattern, uint8_t(block - 1));
case 24: if(block > 0) return Event(Event::Type::Colour, uint8_t(block - 1));
}
}
return std::nullopt;
}
};
static constexpr auto character_events = events<CharacterGenerator>(); static constexpr auto character_events = events<CharacterGenerator>();
}; };