glShaderSource
3G

# glShaderSource

Replaces the source code in a shader object

## C Specification

    		void glShaderSource
    		GLuint shader
    		GLsizei count
    		const GLchar **string
    		const GLint *length

## Parameters

`shader`

  Specifies the handle of the shader object whose source code is to be replaced.

`count`

  Specifies the number of elements in the `string` and `length` arrays.

`string`

  Specifies an array of pointers to strings containing the source code to be loaded into the shader.

`length`

  Specifies an array of string lengths.

## Description

`glShaderSource` sets the source code in `shader` to the source code in the array of strings specified by `string`. Any source code previously stored in the shader object is completely replaced. The number of strings in the array is specified by `count`. If `length` is `NULL`, each string is assumed to be null terminated. If `length` is a value other than `NULL`, it points to an array containing a string length for each of the corresponding elements of `string`. Each element in the `length` array may contain the length of the corresponding string (the null character is not counted as part of the string length) or a value less than 0 to indicate that the string is null terminated. The source code strings are not scanned or parsed at this time; they are simply copied into the specified shader object.

## Notes

`glShaderSource` is available only if the GL version is 2.0 or greater.

OpenGL copies the shader source code strings when `glShaderSource` is called, so an application may free its copy of the source code strings immediately after the function returns.

## Errors

`GL_INVALID_VALUE` is generated if `shader` is not a value generated by OpenGL.

`GL_INVALID_OPERATION` is generated if `shader` is not a shader object.

`GL_INVALID_VALUE` is generated if `count` is less than 0.

`GL_INVALID_OPERATION` is generated if `glShaderSource` is executed between the execution of glBegin and the corresponding execution of glEnd.

## Associated Gets

glGetShader with arguments `shader` and `GL_SHADER_SOURCE_LENGTH`

glGetShaderSource with argument `shader`

glIsShader

## See Also

glCompileShader, glCreateShader, glDeleteShader

## Copyright

Copyright 2003-2005 3Dlabs Inc. Ltd. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.