feat(input): virtual input mapping and codegen

5 files changed, 217 insertions, 0 deletions

diff --git a/stockton-input/Cargo.toml b/stockton-input/Cargo.toml
new file mode 100644
index 0000000..39c0666
--- /dev/null
+++ b/stockton-input/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "stockton-input"
+version = "0.1.0"
+authors = ["Oscar Shrimpton <oscar.shrimpton.personal@gmail.com>"]
+edition = "2018"
+
+[dependencies]
\ No newline at end of file
diff --git a/stockton-input/src/axis.rs b/stockton-input/src/axis.rs
new file mode 100644
index 0000000..ebf52bb
--- /dev/null
+++ b/stockton-input/src/axis.rs
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) Oscar Shrimpton 2020
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+use std::fmt::Debug;
+use std::ops::{Deref, DerefMut};
+
+#[derive(Debug, Clone)]
+/// A linear axis, usually with a value from -1 to 1.
+pub struct Axis(i8);
+
+impl Axis {
+    /// Get a new instance with the value set to zero
+    pub fn zero() -> Self {
+        Axis(0)
+    }
+
+    /// Get the normalized value, ie always positive.
+    pub fn normalized(&self) -> i8 {
+        if self.0 < 0 {
+            -self.0
+        } else {
+            self.0
+        }
+    }
+
+    pub fn modify(&mut self, val: i8) {
+        self.0 += val
+    }
+}
+
+impl Default for Axis {
+    fn default() -> Self {
+        Self::zero()
+    }
+}
+
+impl Deref for Axis {
+    type Target = i8;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for Axis {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
diff --git a/stockton-input/src/button.rs b/stockton-input/src/button.rs
new file mode 100644
index 0000000..9fd5e84
--- /dev/null
+++ b/stockton-input/src/button.rs
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) Oscar Shrimpton 2020
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+use std::fmt::Debug;
+
+#[derive(Debug, Clone, PartialEq)]
+/// A boolean input, with additional tracking for if it just changed state.
+pub struct Button {
+    /// How many of the mapped inputs are currently pressed.
+    /// This is used so that holding one button, then another, then releasing the first, will keep the button down continuously as expected.
+    inputs_down: u8,
+
+    /// Whether or not the button changed state in the last batch of actions processed
+    /// Note that pushing 2 buttons bound to this action one after the other won't trigger this twice.
+    pub is_hot: bool,
+}
+
+impl Button {
+    pub fn new() -> Self {
+        Button {
+            inputs_down: 0,
+            is_hot: false,
+        }
+    }
+
+    pub fn is_down(&self) -> bool {
+        self.inputs_down > 0
+    }
+    pub fn is_up(&self) -> bool {
+        self.inputs_down == 0
+    }
+
+    pub fn is_just_down(&self) -> bool {
+        self.is_down() && self.is_hot
+    }
+    pub fn is_just_up(&self) -> bool {
+        self.is_up() && self.is_hot
+    }
+
+    pub fn modify_inputs(&mut self, add: bool) {
+        self.inputs_down = if add {
+            self.inputs_down + 1
+        } else {
+            self.inputs_down - 1
+        };
+
+        if self.inputs_down == 1 || self.inputs_down == 0 {
+            self.is_hot = true;
+        }
+    }
+
+    pub fn set_not_hot(&mut self) {
+        self.is_hot = false;
+    }
+}
+
+impl Default for Button {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/stockton-input/src/lib.rs b/stockton-input/src/lib.rs
new file mode 100644
index 0000000..7bb779f
--- /dev/null
+++ b/stockton-input/src/lib.rs
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) Oscar Shrimpton 2020
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+pub mod axis;
+pub mod button;
+pub mod manager;
+
+pub use axis::Axis;
+pub use button::Button;
+pub use manager::*;
diff --git a/stockton-input/src/manager.rs b/stockton-input/src/manager.rs
new file mode 100644
index 0000000..2b62a93
--- /dev/null
+++ b/stockton-input/src/manager.rs
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) Oscar Shrimpton 2020
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/// A thing that pressing a button can do to an input.
+#[derive(Debug, Clone, Copy)]
+pub enum InputMutation {
+    MapToButton,
+    NegativeAxis,
+    PositiveAxis,
+}
+
+/// A key being pressed or released
+#[derive(Debug, Clone)]
+pub enum Action {
+    KeyPress(u8),
+    KeyRelease(u8),
+}
+
+impl Action {
+    pub fn keycode(&self) -> u8 {
+        match self {
+            Action::KeyPress(x) => *x,
+            Action::KeyRelease(x) => *x,
+        }
+    }
+    pub fn is_down(&self) -> bool {
+        match self {
+            Action::KeyPress(_) => true,
+            Action::KeyRelease(_) => false,
+        }
+    }
+}
+
+pub trait InputManager {
+    fn handle_frame<'a, X: IntoIterator<Item = &'a Action>>(&mut self, actions: X);
+}