GLGETUNIFORM(3G)                [FIXME: manual]               GLGETUNIFORM(3G)

NAME
       glGetUniformfv, glGetUniformiv - Returns the value of a uniform
       variable

C SPECIFICATION
       void glGetUniformfv(GLuint program, GLint location, GLfloat *params);

       void glGetUniformiv(GLuint program, GLint location, GLint *params);

       void glGetUniformuiv(GLuint program, GLint location, GLuint *params);

       void glGetUniformdv(GLuint program, GLint location, GLdouble *params);

       void glGetnUniformfv(GLuint program, GLint location, GLsizei bufSize,
                            GLfloat *params);

       void glGetnUniformiv(GLuint program, GLint location, GLsizei bufSize,
                            GLint *params);

       void glGetnUniformuiv(GLuint program, GLint location, GLsizei bufSize,
                             GLuint *params);

       void glGetnUniformdv(GLuint program, GLint location, GLsizei bufSize,
                            GLdouble *params);

PARAMETERS
       program
           Specifies the program object to be queried.

       location
           Specifies the location of the uniform variable to be queried.

       bufSize
           Specifies the size of the buffer params.

       params
           Returns the value of the specified uniform variable.

DESCRIPTION
       glGetUniform and glGetnUniform return in params the value(s) of the
       specified uniform variable. The type of the uniform variable specified
       by location determines the number of values returned. If the uniform
       variable is defined in the shader as a boolean, int, or float, a single
       value will be returned. If it is defined as a vec2, ivec2, or bvec2,
       two values will be returned. If it is defined as a vec3, ivec3, or
       bvec3, three values will be returned, and so on. To query values stored
       in uniform variables declared as arrays, call glGetUniform for each
       element of the array. To query values stored in uniform variables
       declared as structures, call glGetUniform for each field in the
       structure. The values for uniform variables declared as a matrix will
       be returned in column major order.

       The locations assigned to uniform variables are not known until the
       program object is linked. After linking has occurred, the command
       glGetUniformLocation() can be used to obtain the location of a uniform
       variable. This location value can then be passed to glGetUniform or
       glGetnUniform in order to query the current value of the uniform
       variable. After a program object has been linked successfully, the
       index values for uniform variables remain fixed until the next link
       command occurs. The uniform variable values can only be queried after a
       link if the link was successful.

       The only difference between glGetUniform and glGetnUniform is that
       glGetnUniform will generate an error if size of the params buffer,as
       described by bufSize, is not large enough to hold the result data.

NOTES
       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 is not a program object.

       GL_INVALID_OPERATION is generated if program has not been successfully
       linked.

       GL_INVALID_OPERATION is generated if location does not correspond to a
       valid uniform variable location for the specified program object.

       GL_INVALID_OPERATION is generated by glGetnUniform if the buffer size
       required to store the requested data is greater than bufSize.

ASSOCIATED GETS
       glGetActiveUniform() with arguments program and the index of an active
       uniform variable

       glGetProgram() with arguments program and GL_ACTIVE_UNIFORMS or
       GL_ACTIVE_UNIFORM_MAX_LENGTH

       glGetUniformLocation() with arguments program and the name of a uniform
       variable

       glIsProgram()

VERSION SUPPORT

       +-----------------+-----------------------------------------------------------------------+
       |                 |                            OpenGL Version                             |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |Function /       | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
       |Feature Name     |     |     |     |     |     |     |     |     |     |     |     |     |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetUniformdv   |  -  |  -  |  -  |  -  |  -  |  -  | <?> | <?> | <?> | <?> | <?> | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetUniformfv   | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetUniformiv   | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetUniformuiv  |  -  |  -  | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetnUniformdv  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetnUniformfv  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetnUniformiv  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetnUniformuiv |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  |  -  | <?> |
       +-----------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

SEE ALSO
       glCreateProgram(), glLinkProgram(), glUniform()

COPYRIGHT
       Copyright (C) 2003-2005 3Dlabs Inc. Ltd. Copyright (C) 2010-2014
       Khronos Group. 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/.

COPYRIGHT
       Copyright (C) 2003-2005 3Dlabs Inc. Ltd.
       Copyright (C) 2010-2014 Khronos Group

[FIXME: source]                   05/21/2022                  GLGETUNIFORM(3G)