OpenGL Shader Functions

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There are many built in functions in GLSL. A complete listing, grouped by general function, follows.

Conventions for this page

For the sake of brevity, the following terms are used throughout this article.

  • vec - A general name for a vec2, vec3, or vec4.
  • mat - A general name for a mat2, mat3, or mat4.
  • ivec - A general name for a ivec2, ivec3, or ivec4.
  • bvec - A general name for a bvec2, bvec3, or bvec4.
  • type - A general name for a float, vec2, vec3, or vec4.

Angle and Trigonometry Functions

  • type sin(type) - Returns the sine of the angle. The angle must be given in radians.
  • type cos(type) - Returns the cosine of the angle. The angle must be given in radians.
  • type tan(type) - Returns the tangent of the angle. The angle must be given in radians.
  • type asin(type) - Returns the arcsine of the input. The output is in radians
  • type acos(type) - Returns the arccosine of the input. The output is in radians
  • type atan(type) - Returns the arctangent of the input. The output is in radians
  • type atan(type, type) - Returns the arctangent of the (y, x). The output is in radians.
  • type radians(type) - Converts from degrees to radians.
  • type degrees(type) - Converts from radians to degrees.

Exponential Functions

  • type pow(type base, type power) - Raises the base to the specified power.
  • type exp(type x) - Calculates e^x.
  • type log(type) - Calculates the natural log of the input.
  • type exp2(type x) - Calculates 2^x.
  • type log2(type) - Calculates the log base 2 of the input.
  • type sqrt(type) - Calculates the square root of the input.
  • type inversesqrt(type) - Calculates the inverse square root of the input.