GLGETPROGRAM(3G)

NAME
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/.