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Generate an appropriate instance for line drawing.

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This commit is contained in:
Thomas Harte 2023-01-26 12:09:06 -05:00
parent 0c8815d6a0
commit b12fd00145
3 changed files with 48 additions and 2 deletions
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26
Components/9918/Implementation/9918.cpp
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@ -890,6 +890,32 @@ void Base<personality>::commit_register(int reg, uint8_t value) {
LOG("TODO: Yamaha command; " << PADHEX(2) << +value);
// b0–b3: LO0–LO3 (???)
// b4–b7: CM0-CM3 (???)
switch(value >> 4) {
// All codes not listed below are invalid; just abandon
// whatever's going on, if anything.
default: Storage<personality>::command_ = nullptr;
case 0b0000: break; // TODO: stop.
case 0b0100: break; // TODO: point.
case 0b0101: break; // TODO: pset.
case 0b0110: break; // TODO: srch.
case 0b0111:
Storage<personality>::command_ = std::make_unique<Commands::Line>(Storage<personality>::command_context_);
break;
case 0b1000: break; // TODO: lmmv.
case 0b1001: break; // TODO: lmmm.
case 0b1010: break; // TODO: lmcm.
case 0b1011: break; // TODO: lmmc.
case 0b1100: break; // TODO: hmmv.
case 0b1101: break; // TODO: hmmm.
case 0b1110: break; // TODO: ymmm.
case 0b1111: break; // TODO: hmmc.
}
// TODO: record logical mode.
break;
}
}

2
Components/9918/Implementation/9918Base.hpp
View File

@ -183,7 +183,7 @@ template <Personality personality> struct Storage<personality, std::enable_if_t<
// Command engine state.
CommandContext command_context_;
Command *command_ = nullptr;
std::unique_ptr<Command> command_ = nullptr;
Storage() noexcept {
// Perform sanity checks on the event lists.

22
Components/9918/Implementation/YamahaCommands.hpp
View File

@ -14,6 +14,8 @@
namespace TI {
namespace TMS {
// MARK: - Generics.
struct CommandContext {
int source_x = 0, source_y = 0;
int destination_x = 0, destination_y = 0;
@ -32,14 +34,32 @@ struct Command {
int cycles = 0;
uint8_t value = 0;
// TODO: how best to describe access destination? Probably as (x, y) and logical/fast?
/// Current command parameters.
CommandContext &context;
Command(CommandContext &context) : context(context) {}
/// Request that the fields above are updated given the completed access.
/// Request that the fields above are updated given that the previously-request access
/// was completed.
///
/// @returns @c true if another access has been enqueued; @c false if this command is done.
virtual bool next() = 0;
};
// MARK: - Line drawing.
namespace Commands {
struct Line: public Command {
using Command::Command;
bool next() {
return false;
}
};
}
}
}