glGetProgram
3G

# glGetProgramiv

Returns a parameter from a program object

## C Specification

    		void glGetProgramiv
    		GLuint program
    		GLenum pname
    		GLint *params

## Parameters

`program`

  Specifies the program object to be queried.

`pname`

  Specifies the object parameter. Accepted symbolic names are `GL_DELETE_STATUS`, `GL_LINK_STATUS`, `GL_VALIDATE_STATUS`, `GL_INFO_LOG_LENGTH`, `GL_ATTACHED_SHADERS`, `GL_ACTIVE_ATTRIBUTES`, `GL_ACTIVE_ATTRIBUTE_MAX_LENGTH`, `GL_ACTIVE_UNIFORMS`, `GL_ACTIVE_UNIFORM_MAX_LENGTH`.

`params`

  Returns the requested object parameter.

## Description

`glGetProgram` returns in `params` the value of a parameter for a specific program object. The following parameters are defined:

`GL_DELETE_STATUS`

  `params` returns `GL_TRUE` if `program` is currently flagged for deletion, and `GL_FALSE` otherwise.

`GL_LINK_STATUS`

  `params` returns `GL_TRUE` if the last link operation on `program` was successful, and `GL_FALSE` otherwise.

`GL_VALIDATE_STATUS`

  `params` returns `GL_TRUE` or if the last validation operation on `program` was successful, and `GL_FALSE` otherwise.

`GL_INFO_LOG_LENGTH`

  `params` returns the number of characters in the information log for `program` including the null termination character (i.e., the size of the character buffer required to store the information log). If `program` has no information log, a value of 0 is returned.

`GL_ATTACHED_SHADERS`

  `params` returns the number of shader objects attached to `program`.

`GL_ACTIVE_ATTRIBUTES`

  `params` returns the number of active attribute variables for `program`.

`GL_ACTIVE_ATTRIBUTE_MAX_LENGTH`

  `params` returns the length of the longest active attribute name for `program`, including the null termination character (i.e., the size of the character buffer required to store the longest attribute name). If no active attributes exist, 0 is returned.

`GL_ACTIVE_UNIFORMS`

  `params` returns the number of active uniform variables for `program`.

`GL_ACTIVE_UNIFORM_MAX_LENGTH`

  `params` returns the length of the longest active uniform variable name for `program`, including the null termination character (i.e., the size of the character buffer required to store the longest uniform variable name). If no active uniform variables exist, 0 is returned.

## Notes

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

If an error is generated, no change is made to the contents of `params`.

## Errors

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

`GL_INVALID_OPERATION` is generated if `program` does not refer to a program object.

`GL_INVALID_ENUM` is generated if `pname` is not an accepted value.

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

## Associated Gets

glGetActiveAttrib with argument `program`

glGetActiveUniform with argument `program`

glGetAttachedShaders with argument `program`

glGetProgramInfoLog with argument `program`

glIsProgram ``

## See Also

glAttachShader, glCreateProgram, glDeleteProgram, glGetShader, glLinkProgram, glValidateProgram

## 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/.