pke: audio: fx boilerplate, low-pass spatial

1 files changed, 16 insertions, 0 deletions

diff --git a/src/math-helpers.cpp b/src/math-helpers.cpp
index 5150e55..d153ce5 100644
--- a/src/math-helpers.cpp
+++ b/src/math-helpers.cpp
@@ -48,3 +48,19 @@ void BulletToGlm(const btTransform &trans, glm::mat4 &glmMat4) {
 	glmMat4[3][3] = 1.0f;
 }
 
+template<typename T>
+T log_interp_T(T min_value, T max_value, T t) {
+	T start = log10(min_value);
+	T end   = log10(max_value);
+	T intrp = start + (t * (end - start));
+	return pow(T(10), intrp);
+}
+
+float log_interp(float min_value, float max_value, float t) {
+	return log_interp_T<float>(min_value, max_value, t);
+}
+
+double log_interp(double min_value, double max_value, double t) {
+	return log_interp_T<double>(min_value, max_value, t);
+}
+