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/.