dolphin/Source/Core/InputCommon/ControlReference/FunctionExpression.cpp

348 lines
9.0 KiB
C++

// Copyright 2019 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <chrono>
#include <cmath>
#include "InputCommon/ControlReference/FunctionExpression.h"
namespace ciface
{
namespace ExpressionParser
{
constexpr int LOOP_MAX_REPS = 10000;
constexpr ControlState CONDITION_THRESHOLD = 0.5;
// TODO: Return an oscillating value to make it apparent something was spelled wrong?
class UnknownFunctionExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return false;
}
ControlState GetValue() const override { return 0.0; }
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "unknown"; }
};
// usage: !toggle(toggle_state_input, [clear_state_input])
class ToggleExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
// Optional 2nd argument for clearing state:
return 1 == args.size() || 2 == args.size();
}
ControlState GetValue() const override
{
const ControlState inner_value = GetArg(0).GetValue();
if (inner_value < CONDITION_THRESHOLD)
{
m_released = true;
}
else if (m_released && inner_value > CONDITION_THRESHOLD)
{
m_released = false;
m_state ^= true;
}
if (2 == GetArgCount() && GetArg(1).GetValue() > CONDITION_THRESHOLD)
{
m_state = false;
}
return m_state;
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "toggle"; }
mutable bool m_released{};
mutable bool m_state{};
};
// usage: !not(expression)
class NotExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 1 == args.size();
}
ControlState GetValue() const override { return 1.0 - GetArg(0).GetValue(); }
void SetValue(ControlState value) override { GetArg(0).SetValue(1.0 - value); }
std::string GetFuncName() const override { return ""; }
};
// usage: !sin(expression)
class SinExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 1 == args.size();
}
ControlState GetValue() const override { return std::sin(GetArg(0).GetValue()); }
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "sin"; }
};
// usage: !timer(seconds)
class TimerExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 1 == args.size();
}
ControlState GetValue() const override
{
const auto now = Clock::now();
const auto elapsed = now - m_start_time;
using FSec = std::chrono::duration<ControlState>;
const ControlState val = GetArg(0).GetValue();
ControlState progress = std::chrono::duration_cast<FSec>(elapsed).count() / val;
if (std::isinf(progress))
{
// User configured a 0.0 length timer. Reset the timer and return 0.0.
progress = 0.0;
m_start_time = now;
}
else if (progress >= 1.0)
{
const ControlState reset_count = std::floor(progress);
m_start_time += std::chrono::duration_cast<Clock::duration>(FSec(val * reset_count));
progress -= reset_count;
}
return progress;
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "timer"; }
private:
using Clock = std::chrono::steady_clock;
mutable Clock::time_point m_start_time = Clock::now();
};
// usage: !if(condition, true_expression, false_expression)
class IfExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 3 == args.size();
}
ControlState GetValue() const override
{
return (GetArg(0).GetValue() > CONDITION_THRESHOLD) ? GetArg(1).GetValue() :
GetArg(2).GetValue();
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "if"; }
};
// usage: !minus(expression)
class UnaryMinusExpression : public FunctionExpression
{
private:
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 1 == args.size();
}
ControlState GetValue() const override
{
// Subtraction for clarity:
return 0.0 - GetArg(0).GetValue();
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "minus"; }
};
// usage: !while(condition, expression)
class WhileExpression : public FunctionExpression
{
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 2 == args.size();
}
ControlState GetValue() const override
{
// Returns 1.0 on successful loop, 0.0 on reps exceeded. Sensible?
for (int i = 0; i != LOOP_MAX_REPS; ++i)
{
// Check condition of 1st argument:
const ControlState val = GetArg(0).GetValue();
if (val < CONDITION_THRESHOLD)
return 1.0;
// Evaluate 2nd argument:
GetArg(1).GetValue();
}
// Exceeded max reps:
return 0.0;
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "while"; }
};
// usage: deadzone(input, amount)
class DeadzoneExpression : public FunctionExpression
{
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 2 == args.size();
}
ControlState GetValue() const override
{
const ControlState val = GetArg(0).GetValue();
const ControlState deadzone = GetArg(1).GetValue();
return std::copysign(std::max(0.0, std::abs(val) - deadzone) / (1.0 - deadzone), val);
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "deadzone"; }
};
// usage: smooth(input, seconds)
// seconds is seconds to change from 0.0 to 1.0
class SmoothExpression : public FunctionExpression
{
virtual bool ValidateArguments(const std::vector<std::unique_ptr<Expression>>& args) override
{
return 2 == args.size();
}
ControlState GetValue() const override
{
const auto now = Clock::now();
const auto elapsed = now - m_last_update;
m_last_update = now;
const ControlState desired_value = GetArg(0).GetValue();
const ControlState smooth = GetArg(1).GetValue();
using FSec = std::chrono::duration<ControlState>;
const ControlState max_move = std::chrono::duration_cast<FSec>(elapsed).count() / smooth;
if (std::isinf(max_move))
{
m_value = desired_value;
}
else
{
const ControlState diff = desired_value - m_value;
m_value += std::copysign(std::min(max_move, std::abs(diff)), diff);
}
return m_value;
}
void SetValue(ControlState value) override {}
std::string GetFuncName() const override { return "smooth"; }
private:
using Clock = std::chrono::steady_clock;
mutable ControlState m_value = 0.0;
mutable Clock::time_point m_last_update = Clock::now();
};
std::unique_ptr<FunctionExpression> MakeFunctionExpression(std::string name)
{
if (name.empty())
return std::make_unique<NotExpression>();
else if ("if" == name)
return std::make_unique<IfExpression>();
else if ("sin" == name)
return std::make_unique<SinExpression>();
else if ("timer" == name)
return std::make_unique<TimerExpression>();
else if ("toggle" == name)
return std::make_unique<ToggleExpression>();
else if ("while" == name)
return std::make_unique<WhileExpression>();
else if ("minus" == name)
return std::make_unique<UnaryMinusExpression>();
else if ("deadzone" == name)
return std::make_unique<DeadzoneExpression>();
else if ("smooth" == name)
return std::make_unique<SmoothExpression>();
else
return std::make_unique<UnknownFunctionExpression>();
}
int FunctionExpression::CountNumControls() const
{
int result = 0;
for (auto& arg : m_args)
result += arg->CountNumControls();
return result;
}
void FunctionExpression::UpdateReferences(ControlEnvironment& env)
{
for (auto& arg : m_args)
arg->UpdateReferences(env);
}
FunctionExpression::operator std::string() const
{
std::string result = '!' + GetFuncName();
for (auto& arg : m_args)
result += ' ' + static_cast<std::string>(*arg);
return result;
}
bool FunctionExpression::SetArguments(std::vector<std::unique_ptr<Expression>>&& args)
{
m_args = std::move(args);
return ValidateArguments(m_args);
}
Expression& FunctionExpression::GetArg(u32 number)
{
return *m_args[number];
}
const Expression& FunctionExpression::GetArg(u32 number) const
{
return *m_args[number];
}
u32 FunctionExpression::GetArgCount() const
{
return u32(m_args.size());
}
} // namespace ExpressionParser
} // namespace ciface