diff --git a/src/base/base_core.c b/src/base/base_core.c
index b392e4a0..e5faadde 100644
--- a/src/base/base_core.c
+++ b/src/base/base_core.c
@@ -602,3 +602,37 @@ ring_read(U8 *ring_base, U64 ring_size, U64 ring_pos, void *dst_data, U64 read_s
   }
   return read_size;
 }
+
+////////////////////////////////
+
+internal U64
+u64_array_bsearch(U64 *arr, U64 count, U64 value)
+{
+  if(count > 1 && arr[0] <= value && value < arr[count-1])
+  {
+    U64 l = 0;
+    U64 r = count - 1;
+    for(; l <= r; )
+    {
+      U64 m = l + (r - l) / 2;
+      if(arr[m] == value)
+      {
+        return m;
+      }
+      else if(arr[m] < value)
+      {
+        l = m + 1;
+      }
+      else
+      {
+        r = m - 1;
+      }
+    }
+  }
+  else if (count == 1 && arr[0] == value)
+  {
+    return 0;
+  }
+  return max_U64;
+}
+
diff --git a/src/base/base_core.h b/src/base/base_core.h
index 191e1e7f..9e2d686a 100644
--- a/src/base/base_core.h
+++ b/src/base/base_core.h
@@ -885,4 +885,8 @@ internal U64 ring_read(U8 *ring_base, U64 ring_size, U64 ring_pos, void *dst_dat
 
 #define quick_sort(ptr, count, element_size, cmp_function) qsort((ptr), (count), (element_size), (int (*)(const void *, const void *))(cmp_function))
 
+////////////////////////////////
+
+internal U64 u64_array_bsearch(U64 *arr, U64 count, U64 value);
+
 #endif // BASE_CORE_H
diff --git a/src/base/base_math.c b/src/base/base_math.c
index 2c6201f3..b0a85bfe 100644
--- a/src/base/base_math.c
+++ b/src/base/base_math.c
@@ -634,6 +634,37 @@ rng1u64_array_from_list(Arena *arena, Rng1U64List *list)
   return arr;
 }
 
+internal U64
+rng_1u64_array_bsearch(Rng1U64Array arr, U64 value)
+{
+  if(arr.count > 0 && arr.v[0].min <= value && value < arr.v[arr.count-1].max)
+  {
+    U64 l = 0;
+    U64 r = arr.count - 1;
+    for(; l <= r; )
+    {
+      U64 m = l + (r - l) / 2;
+      if(contains_1u64(arr.v[m], value))
+      {
+        return m;
+      }
+      else if(arr.v[m].min < value)
+      {
+        l = m + 1;
+      }
+      else
+      {
+        r = m - 1;
+      }
+    }
+  }
+  else if(arr.count == 1 && contains_1u64(arr.v[0], value))
+  {
+    return 0;
+  }
+  return max_U64;
+}
+
 internal void
 rng1s64_list_push(Arena *arena, Rng1S64List *list, Rng1S64 rng)
 {
@@ -657,3 +688,4 @@ rng1s64_array_from_list(Arena *arena, Rng1S64List *list)
   }
   return arr;
 }
+
diff --git a/src/base/base_math.h b/src/base/base_math.h
index b6063ad5..d13adbf4 100644
--- a/src/base/base_math.h
+++ b/src/base/base_math.h
@@ -668,6 +668,7 @@ internal U32 u32_from_rgba(Vec4F32 rgba);
 internal void rng1u64_list_push(Arena *arena, Rng1U64List *list, Rng1U64 rng);
 internal void rng1u64_list_concat(Rng1U64List *list, Rng1U64List *to_concat);
 internal Rng1U64Array rng1u64_array_from_list(Arena *arena, Rng1U64List *list);
+internal U64 rng_1u64_array_bsearch(Rng1U64Array arr, U64 value);
 
 internal void rng1s64_list_push(Arena *arena, Rng1S64List *list, Rng1S64 rng);
 internal Rng1S64Array rng1s64_array_from_list(Arena *arena, Rng1S64List *list);