Merge pull request #40 from recp/aabb-ext

Axis-Aligned Bounding Box (AABB) Extensions

include/cglm/box.h

@@ -153,4 +153,50 @@ glm_aabb_frustum(vec3 box[2], vec4 planes[6]) {
   return true;
 }
 
+/*!
+ * @brief invalidate AABB min and max values
+ *
+ * @param[in, out]  box bounding box
+ */
+CGLM_INLINE
+void
+glm_aabb_invalidate(vec3 box[2]) {
+  glm_vec_broadcast(FLT_MAX,  box[0]);
+  glm_vec_broadcast(-FLT_MAX, box[1]);
+}
+
+/*!
+ * @brief check if AABB is valid or not
+ *
+ * @param[in]  box bounding box
+ */
+CGLM_INLINE
+bool
+glm_aabb_isvalid(vec3 box[2]) {
+  return glm_vec_max(box[0]) != FLT_MAX
+         && glm_vec_min(box[1]) != -FLT_MAX;
+}
+
+/*!
+ * @brief distance between of min and max
+ *
+ * @param[in]  box bounding box
+ */
+CGLM_INLINE
+float
+glm_aabb_size(vec3 box[2]) {
+  return glm_vec_distance(box[0], box[1]);
+}
+
+/*!
+ * @brief radius of sphere which surrounds AABB
+ *
+ * @param[in]  box bounding box
+ */
+CGLM_INLINE
+float
+glm_aabb_radius(vec3 box[2]) {
+  return glm_aabb_size(box) * 0.5f;
+}
+
 #endif /* cglm_box_h */

include/cglm/io.h

@@ -171,4 +171,33 @@ glm_versor_print(versor vec,
 #undef m
 }
 
+CGLM_INLINE
+void
+glm_aabb_print(vec3                    bbox[2],
+               const char * __restrict tag,
+               FILE       * __restrict ostream) {
+  int i, j;
+
+#define m 3
+
+  fprintf(ostream, "AABB (%s):\n", tag ? tag: "float");
+
+  for (i = 0; i < 2; i++) {
+    fprintf(ostream, "\t|");
+
+    for (j = 0; j < m; j++) {
+      fprintf(ostream, "%0.4f", bbox[i][j]);
+
+      if (j != m - 1)
+        fprintf(ostream, "\t");
+    }
+
+    fprintf(ostream, "|\n");
+  }
+
+  fprintf(ostream, "\n");
+
+#undef m
+}
+
 #endif /* cglm_io_h */