X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fworld%2FBlockGravity.hpp;fp=src%2Fworld%2FBlockGravity.hpp;h=6a17b61e6dee46b93f2cdd268a91380dd3196e00;hb=ed3bdc028edc0ecb5835d1c0bf18dbc59b342daf;hp=0000000000000000000000000000000000000000;hpb=73d4dd2d78eda1e2f8889d1913a97a60cec86876;p=blank.git

diff --git a/src/world/BlockGravity.hpp b/src/world/BlockGravity.hpp
new file mode 100644
index 0000000..6a17b61
--- /dev/null
+++ b/src/world/BlockGravity.hpp
@@ -0,0 +1,28 @@
+#ifndef BLANK_WORLD_BLOCKGRAVITY_HPP_
+#define BLANK_WORLD_BLOCKGRAVITY_HPP_
+
+#include <memory>
+#include <glm/glm.hpp>
+
+
+namespace blank {
+
+class TokenStreamReader;
+
+struct BlockGravity {
+
+	virtual ~BlockGravity();
+
+	/// get gravitational force for a unit mass at relative position diff
+	/// diff is target - block, i.e. pointing from block towards the target
+	/// orientation of the block in question is given by M
+	/// return value should be world absolute
+	virtual glm::vec3 GetGravity(const glm::vec3 &diff, const glm::mat4 &M) const noexcept = 0;
+
+	static std::unique_ptr<BlockGravity> Read(TokenStreamReader &in);
+
+};
+
+}
+
+#endif