1 files changed, 77 insertions, 0 deletions
diff --git a/src/math.c b/src/math.c
new file mode 100644
index 0000000..ecba107
--- /dev/null
+++ b/src/math.c
@@ -0,0 +1,77 @@
+#include "voxel.h"
+
+void face_to_vec(Face face, ivec3 out)
+{
+	glm_ivec3_zero(out);
+
+	switch (face) {
+	case POS_X:
+		out[0] = 1;
+		break;
+	case NEG_X:
+		out[0] = -1;
+		break;
+	case POS_Y:
+		out[1] = 1;
+		break;
+	case NEG_Y:
+		out[1] = -1;
+		break;
+	case POS_Z:
+		out[2] = 1;
+		break;
+	case NEG_Z:
+		out[2] = -1;
+		break;
+	}
+}
+
+Face face_opposite(Face face)
+{
+	switch (face) {
+	case POS_X:
+		return NEG_X;
+	case NEG_X:
+		return POS_X;
+	case POS_Y:
+		return NEG_Y;
+	case NEG_Y:
+		return POS_Y;
+	case POS_Z:
+		return NEG_Z;
+	case NEG_Z:
+		return POS_Z;
+	}
+
+	return 0;
+}
+
+void face_perpendicular(Face face, Face out[2])
+{
+	switch (face) {
+	case POS_X:
+		out[0] = NEG_Z;
+		out[1] = NEG_Y;
+		break;
+	case NEG_X:
+		out[0] = POS_Y;
+		out[1] = POS_Z;
+		break;
+	case POS_Y:
+		out[0] = NEG_X;
+		out[1] = NEG_Z;
+		break;
+	case NEG_Y:
+		out[0] = POS_Z;
+		out[1] = POS_X;
+		break;
+	case POS_Z:
+		out[0] = NEG_Y;
+		out[1] = NEG_X;
+		break;
+	case NEG_Z:
+		out[0] = POS_X;
+		out[1] = POS_Y;
+		break;
+	}
+}