X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fphysics%2FDerivative.hpp;fp=src%2Fphysics%2FDerivative.hpp;h=ae3d5e58d2b1b2a56df7fbc48e2528a284ce09c7;hb=d220b0348951ce210ad4ea18dbe9934dd2999a60;hp=0000000000000000000000000000000000000000;hpb=9932ee17a767b64cb52c213e133c6b91a90a8dd2;p=gong.git

diff --git a/src/physics/Derivative.hpp b/src/physics/Derivative.hpp
new file mode 100644
index 0000000..ae3d5e5
--- /dev/null
+++ b/src/physics/Derivative.hpp
@@ -0,0 +1,49 @@
+#ifndef GONG_PHYSICS_DERIVATIVE_HPP_
+#define GONG_PHYSICS_DERIVATIVE_HPP_
+
+#include "../graphics/glm.hpp"
+
+#include <glm/gtc/quaternion.hpp>
+
+
+namespace gong {
+namespace physics {
+
+struct State;
+
+
+struct Derivative {
+
+	glm::vec3 dpos;
+	glm::vec3 dlin;
+	glm::quat dorient;
+	glm::vec3 dang;
+
+	Derivative() noexcept;
+	Derivative(
+		const glm::vec3 &,
+		const glm::vec3 &,
+		const glm::quat &,
+		const glm::vec3 &
+	) noexcept;
+
+};
+
+
+inline Derivative operator +(const Derivative &a, const Derivative &b) noexcept {
+	return Derivative(a.dpos + b.dpos, a.dlin + b.dlin, a.dorient * b.dorient, a.dang + b.dang);
+}
+
+inline Derivative operator *(float f, const Derivative &d) noexcept {
+	return Derivative(f * d.dpos, f * d.dlin, f * d.dorient, f * d.dang);
+}
+inline Derivative operator *(const Derivative &d, float f) noexcept {
+	return f * d;
+}
+
+State &operator +=(State &s, const Derivative &d) noexcept;
+
+}
+}
+
+#endif