X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fworld%2FChunk.hpp;h=67794145290ea8adcbaef3dc00618f0122cb93d6;hb=efc3c1ba52cbe0fc9a4010c37c2d7c7020a0b481;hp=4938c1b1a7a92f3f34c861e30287ca23491c6686;hpb=e20be973f6ef23164ae54398088e1b14d9bac3ab;p=blank.git

diff --git a/src/world/Chunk.hpp b/src/world/Chunk.hpp
index 4938c1b..6779414 100644
--- a/src/world/Chunk.hpp
+++ b/src/world/Chunk.hpp
@@ -6,6 +6,7 @@
 #include "../geometry/Location.hpp"
 #include "../geometry/primitive.hpp"
 
+#include <set>
 #include <vector>
 #include <glm/glm.hpp>
 #include <glm/gtx/transform.hpp>
@@ -34,6 +35,14 @@ public:
 	static glm::vec3 Center() noexcept { return glm::vec3(8.0f); }
 	static float Radius() noexcept { return 27.71281292110203669632f; /* 16 * √3 */ }
 
+	/// get bounding box relative to given reference chunk
+	AABB RelativeBounds(const ExactLocation::Coarse &ref) const noexcept {
+		AABB bounds;
+		bounds.min = (position - ref) * ExactLocation::Extent();
+		bounds.max = bounds.min + ExactLocation::FExtent();
+		return bounds;
+	}
+
 	static constexpr bool InBounds(const ExactLocation::Fine &pos) noexcept {
 		return
 			pos.x >= 0.0f && pos.x < fside &&
@@ -69,7 +78,11 @@ public:
 			(idx / (side * side))
 		);
 	}
-	glm::mat4 ToTransform(const RoughLocation::Fine &pos, int idx) const noexcept;
+	/// get a chunk-local transform for block at given position and index
+	/// (position and index are redundant)
+	glm::mat4 ToTransform(const RoughLocation::Fine &position, int index) const noexcept;
+	/// same as above, but also apply offset to given reference
+	glm::mat4 ToTransform(const ExactLocation::Coarse &ref, const RoughLocation::Fine &pos, int idx) const noexcept;
 
 	ExactLocation::Fine ToSceneCoords(const ExactLocation::Coarse &base, const ExactLocation::Fine &pos) const noexcept {
 		return ExactLocation::Fine((position - base) * ExactLocation::Extent()) + pos;
@@ -128,19 +141,27 @@ public:
 
 	float GetVertexLight(const RoughLocation::Fine &, const BlockMesh::Position &, const EntityMesh::Normal &) const noexcept;
 
+	/// get gravity for one unit mass at given point
+	glm::vec3 GravityAt(const ExactLocation &) const noexcept;
+
+	/// check if given ray passes this chunk at all
+	/// given reference indicates the chunk offset of the ray in world space
 	bool Intersection(
 		const Ray &ray,
-		const glm::mat4 &M,
+		const ExactLocation::Coarse &reference,
 		float &dist
 	) const noexcept {
-		return blank::Intersection(ray, Bounds(), M, &dist);
+		return blank::Intersection(ray, RelativeBounds(reference), dist);
 	}
 
+	/// check if given ray intersects any block of this chunk
+	/// given reference indicates the chunk offset of the ray in world space
 	bool Intersection(
 		const Ray &,
-		const glm::mat4 &M,
+		const ExactLocation::Coarse &reference,
 		WorldCollision &) noexcept;
 
+	/// get all blocks intersecting given box
 	bool Intersection(
 		const AABB &box,
 		const glm::mat4 &Mbox,
@@ -155,6 +176,7 @@ public:
 
 	void Position(const ExactLocation::Coarse &pos) noexcept { position = pos; }
 	const ExactLocation::Coarse &Position() const noexcept { return position; }
+
 	glm::mat4 Transform(const ExactLocation::Coarse &offset) const noexcept {
 		return glm::translate((position - offset) * ExactLocation::Extent());
 	}
@@ -168,6 +190,10 @@ public:
 	bool Lighted() const noexcept { return lighted; }
 	void ScanLights();
 
+	/// check for active blocks, should be called after
+	/// block data was modified by means other than SetBlock()
+	void ScanActive();
+
 	void Ref() noexcept { ++ref_count; }
 	void UnRef() noexcept { --ref_count; }
 	bool Referenced() const noexcept { return ref_count > 0; }
@@ -185,6 +211,8 @@ private:
 	const BlockTypeRegistry *types;
 	Chunk *neighbor[Block::FACE_COUNT];
 
+	std::set<int> gravity;
+
 	Block blocks[size];
 	unsigned char light[size];
 	bool generated;