18. GLSL built-in functions

• GLSL provides numerous mathematical functions for scalars, vectors, and matrices:

  
      log( ) // natural log
      exp( ) // exponent
      log2( ) // log base 2
      exp2( ) // 2 to the power of...
      sqrt( )
  
  

• For example,

  
      vec2 results = pow( vec2( 2, 3 ), vec2( 2, 2 ) );	// 2^2, 3^2
      float x = sin( 1.0 );         // Also cos, tan, atan, asin...
      float z = radians( 45.0f );   // Converts from degrees to radians
      float z = degrees( 0.6f );    // Converts from radians to degrees