X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fworld%2FBlock.hpp;fp=src%2Fworld%2FBlock.hpp;h=74af3e4ab4bbf025e342674e6bc7eff986bf2d7a;hb=b7d09e1e35ef90282c97509e0020b20db3c7ea9f;hp=0000000000000000000000000000000000000000;hpb=e53a0e2e711a7d8bd9b0ddacd1360aa14370643f;p=blank.git

diff --git a/src/world/Block.hpp b/src/world/Block.hpp
new file mode 100644
index 0000000..74af3e4
--- /dev/null
+++ b/src/world/Block.hpp
@@ -0,0 +1,135 @@
+#ifndef BLANK_WORLD_BLOCK_HPP_
+#define BLANK_WORLD_BLOCK_HPP_
+
+#include <glm/glm.hpp>
+
+
+namespace blank {
+
+/// single 1x1x1 cube
+struct Block {
+
+	using Type = unsigned short;
+	using Pos = glm::vec3;
+
+	enum Face {
+		FACE_UP,
+		FACE_DOWN,
+		FACE_RIGHT,
+		FACE_LEFT,
+		FACE_FRONT,
+		FACE_BACK,
+		FACE_COUNT,
+	};
+	enum Turn {
+		TURN_NONE,
+		TURN_LEFT,
+		TURN_AROUND,
+		TURN_RIGHT,
+		TURN_COUNT,
+	};
+
+	static constexpr int ORIENT_COUNT = FACE_COUNT * TURN_COUNT;
+
+	Type type;
+	unsigned char orient;
+
+	constexpr explicit Block(Type type = 0, Face face = FACE_UP, Turn turn = TURN_NONE) noexcept
+	: type(type), orient(face * TURN_COUNT + turn) { }
+
+	const glm::mat4 &Transform() const noexcept { return orient2transform[orient]; }
+
+	Face GetFace() const noexcept { return Face(orient / TURN_COUNT); }
+	void SetFace(Face face) noexcept { orient = face * TURN_COUNT + GetTurn(); }
+	Turn GetTurn() const noexcept { return Turn(orient % TURN_COUNT); }
+	void SetTurn(Turn turn) noexcept { orient = GetFace() * TURN_COUNT + turn; }
+
+	Face OrientedFace(Face f) const noexcept { return orient2face[orient][f]; }
+
+	static Face Opposite(Face f) noexcept {
+		return Face(f ^ 1);
+	}
+
+	static int Axis(Face f) noexcept {
+		switch (f) {
+			case FACE_UP:
+			case FACE_DOWN:
+				return 1;
+			default:
+			case FACE_RIGHT:
+			case FACE_LEFT:
+				return 0;
+			case FACE_FRONT:
+			case FACE_BACK:
+				return 2;
+		}
+	}
+
+	static glm::tvec3<int> FaceNormal(Face face) noexcept {
+		return face2normal[face];
+	}
+
+	static Face NormalFace(const glm::vec3 &norm) noexcept {
+		const glm::vec3 anorm(abs(norm));
+		if (anorm.x > anorm.y) {
+			if (anorm.x > anorm.z) {
+				return norm.x > 0.0f ? FACE_RIGHT : FACE_LEFT;
+			} else {
+				return norm.z > 0.0f ? FACE_FRONT : FACE_BACK;
+			}
+		} else {
+			if (anorm.y > anorm.z) {
+				return norm.y > 0.0f ? FACE_UP : FACE_DOWN;
+			} else {
+				return norm.z > 0.0f ? FACE_FRONT : FACE_BACK;
+			}
+		}
+	}
+
+	struct FaceSet {
+
+		explicit FaceSet(unsigned char v = 0)
+		: value(v) { }
+
+		bool IsSet(Face f) const {
+			return value & Mask(f);
+		}
+		void Set(Face f) {
+			value |= Mask(f);
+		}
+		void Unset(Face f) {
+			value |= ~Mask(f);
+		}
+
+		void Clear() {
+			value = 0;
+		}
+		void Fill() {
+			value = Mask(FACE_COUNT) - 1;
+		}
+
+		bool Empty() const {
+			return value == 0;
+		}
+		bool All() const {
+			return value == Mask(FACE_COUNT) - 1;
+		}
+
+		unsigned char Mask(Face f) const {
+			return 1 << f;
+		}
+
+		unsigned char value;
+
+	};
+
+private:
+	static const glm::tvec3<int> face2normal[6];
+	static const glm::mat4 orient2transform[ORIENT_COUNT];
+	static const Face orient2face[ORIENT_COUNT][FACE_COUNT];
+
+};
+
+}
+
+#endif