1 files changed, 130 insertions, 0 deletions
diff --git a/common/accel_types.hpp b/common/accel_types.hpp
new file mode 100644
index 0000000..15f5a50
--- /dev/null
+++ b/common/accel_types.hpp
@@ -0,0 +1,130 @@
+#pragma once
+
+#define _USE_MATH_DEFINES
+#include <math.h>
+
+namespace rawaccel {
+
+// Error throwing calls std libraries which are unavailable in kernel mode.
+#ifdef _KERNEL_MODE
+    inline void error(const char*) {}
+#else
+    void error(const char* s);
+#endif
+
+    using milliseconds = double;
+
+    /// <summary> Struct to hold arguments for an acceleration function. </summary>
+    struct accel_args {
+        milliseconds time_min = 0.4;
+        double offset = 0;
+        double accel = 0;
+        double lim_exp = 2;
+        double midpoint = 0;
+    };
+
+    /// <summary>
+    /// Struct to hold acceleration curve implementation details.
+    /// </summary>
+    /// <typeparam name="T">Type of acceleration.</typeparam>
+    template <typename T>
+    struct accel_implentation {
+        
+        /// <summary> First constant for use in acceleration curves. Generally, the acceleration ramp rate.</summary>
+        double curve_constant_one = 0;
+
+        /// <summary> Second constant for use in acceleration curves. Generally, the limit or exponent in the curve. </summary>
+        double curve_constant_two = 0;
+
+        /// <summary> Third constant for use in acceleration curves. The midpoint in sigmoid mode. </summary>
+        double curve_constant_three = 0;
+
+        /// <summary> The offset past which acceleration is applied. Used in power mode. </summary>
+        double offset = 0;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="accel_implementation{T}"/> struct.
+        /// </summary>
+        /// <param name="args"></param>
+        /// <returns></returns>
+        accel_implentation(accel_args args)
+        {
+            curve_constant_one = args.accel;
+            curve_constant_two = args.lim_exp - 1;
+            curve_constant_three = args.midpoint;
+            offset = args.offset;
+        }
+
+        /// <summary>
+        /// Returns accelerated value of speed as a ratio of magnitude.
+        /// </summary>
+        /// <param name="speed">Mouse speed at which to calculate acceleration.</param>
+        /// <returns>Ratio of accelerated movement magnitude to input movement magnitude.</returns>
+        double accelerate(double speed) { return 0; }
+
+        /// <summary>
+        /// Verifies arguments as valid. Errors if not.
+        /// </summary>
+        /// <param name="args">Arguments to verified.</param>
+        void verify(accel_args args) {
+            if (args.accel < 0) error("accel can not be negative, use a negative weight to compensate");
+            if (args.time_min <= 0) error("min time must be positive");
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <returns></returns>
+        accel_implentation() = default;
+    };
+
+    /// <summary> Struct to hold linear acceleration implementation. </summary>
+    struct accel_linear : accel_implentation<accel_linear> {
+        accel_linear(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+    /// <summary> Struct to hold "classic" (linear raised to power) acceleration implementation. </summary>
+    struct accel_classic : accel_implentation<accel_classic> {
+        accel_classic(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+    /// <summary> Struct to hold "natural" (vanishing difference) acceleration implementation. </summary>
+    struct accel_natural : accel_implentation<accel_natural> {
+        accel_natural(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+    /// <summary> Struct to hold logarithmic acceleration implementation. </summary>
+    struct accel_logarithmic : accel_implentation<accel_logarithmic> {
+        accel_logarithmic(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+    /// <summary> Struct to hold sigmoid (s-shaped) acceleration implementation. </summary>
+    struct accel_sigmoid : accel_implentation<accel_sigmoid> {
+        accel_sigmoid(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+    /// <summary> Struct to hold power (non-additive) acceleration implementation. </summary>
+    struct accel_power : accel_implentation<accel_power> {
+        accel_power(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+    /// <summary> Struct to hold acceleration implementation which applies no acceleration. </summary>
+    struct accel_noaccel : accel_implentation<accel_noaccel> {
+        accel_noaccel(accel_args args);
+        double accelerate(double speed);
+        void verify(accel_args args);
+    };
+
+}