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+.. default-domain:: C
+
+utils / helpers
+================================================================================
+
+Header: cglm/util.h
+
+
+
+Table of contents (click to go):
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Functions:
+
+1. :c:func:`glm_sign`
+#. :c:func:`glm_signf`
+#. :c:func:`glm_rad`
+#. :c:func:`glm_deg`
+#. :c:func:`glm_make_rad`
+#. :c:func:`glm_make_deg`
+#. :c:func:`glm_pow2`
+#. :c:func:`glm_min`
+#. :c:func:`glm_max`
+#. :c:func:`glm_clamp`
+#. :c:func:`glm_lerp`
+#. :c:func:`glm_swapf`
+
+Functions documentation
+~~~~~~~~~~~~~~~~~~~~~~~
+
+.. c:function:: int  glm_sign(int val)
+
+    | returns sign of 32 bit integer as +1, -1, 0
+
+    | **Important**: It returns 0 for zero input
+
+    Parameters:
+      | *[in]*  **val**   an integer
+
+    Returns:
+      sign of given number
+
+.. c:function:: float  glm_signf(float val)
+
+    | returns sign of 32 bit integer as +1.0, -1.0, 0.0
+
+    | **Important**: It returns 0.0f for zero input
+
+    Parameters:
+      | *[in]*  **val**   a float
+
+    Returns:
+      sign of given number
+
+.. c:function:: float  glm_rad(float deg)
+
+    | convert degree to radians
+
+    Parameters:
+      | *[in]*  **deg**   angle in degrees
+
+.. c:function:: float glm_deg(float rad)
+
+    | convert radians to degree
+
+    Parameters:
+      | *[in]*  **rad**      angle in radians
+
+.. c:function:: void  glm_make_rad(float *degm)
+
+    | convert exsisting degree to radians. this will override degrees value
+
+    Parameters:
+      | *[in, out]*  **deg**      pointer to angle in degrees
+
+.. c:function:: void  glm_make_deg(float *rad)
+
+    | convert exsisting radians to degree. this will override radians value
+
+    Parameters:
+      | *[in, out]*  **rad**      pointer to angle in radians
+
+.. c:function:: float  glm_pow2(float x)
+
+    | multiplies given parameter with itself = x * x or powf(x, 2)
+
+    Parameters:
+      | *[in]*  **x** value
+
+    Returns:
+      square of a given number
+
+.. c:function:: float  glm_min(float a, float b)
+
+    | returns minimum of given two values
+
+    Parameters:
+      | *[in]*  **a** number 1
+      | *[in]*  **b** number 2
+
+    Returns:
+      minimum value
+
+.. c:function:: float  glm_max(float a, float b)
+
+    | returns maximum of given two values
+
+    Parameters:
+      | *[in]*  **a** number 1
+      | *[in]*  **b** number 2
+
+    Returns:
+      maximum value
+
+.. c:function:: void  glm_clamp(float val, float minVal, float maxVal)
+
+    constrain a value to lie between two further values
+
+    Parameters:
+      | *[in]*  **val**     input value
+      | *[in]*  **minVal**  minimum value
+      | *[in]*  **maxVal**  maximum value
+
+    Returns:
+      clamped value
+
+.. c:function:: float  glm_lerp(float from, float to, float t)
+
+    linear interpolation between two number
+
+    | formula:  from + s * (to - from)
+
+    Parameters:
+      | *[in]*  **from**   from value
+      | *[in]*  **to**     to value
+      | *[in]*  **t**      interpolant (amount) clamped between 0 and 1
+
+    Returns:
+       interpolated value
+
+.. c:function:: bool glm_eq(float a, float b)
+
+    check if two float equal with using EPSILON
+
+    Parameters:
+      | *[in]*  **a**   a
+      | *[in]*  **b**   b
+
+    Returns:
+       true if a and b are equal
+
+.. c:function:: float glm_percent(float from, float to, float current)
+
+    percentage of current value between start and end value
+
+    Parameters:
+      | *[in]*  **from**   from value
+      | *[in]*  **to**     to value
+      | *[in]*  **current**   value between from and to values
+
+    Returns:
+       percentage of current value
+
+.. c:function:: float glm_percentc(float from, float to, float current)
+
+    clamped percentage of current value between start and end value
+
+    Parameters:
+      | *[in]*  **from**      from value
+      | *[in]*  **to**        to value
+      | *[in]*  **current**   value between from and to values
+
+    Returns:
+       clamped normalized percent (0-100 in 0-1)
+
+.. c:function:: void glm_swapf(float *a, float *b) 
+
+    swap two float values
+
+    Parameters:
+      | *[in]*  **a**      float 1
+      | *[in]*  **b**      float 2