glgetactivesubroutineuniform(3g) [centos man page]

GLGETACTIVESUBROUTIN(3G)					   OpenGL Manual					  GLGETACTIVESUBROUTIN(3G)

NAME

       glGetActiveSubroutineUniform - query a property of an active shader subroutine uniform

C SPECIFICATION

       void glGetActiveSubroutineUniformiv(GLuint program, GLenum shadertype, GLuint index, GLenum pname, GLint *values);

PARAMETERS

       program
	   Specifies the name of the program containing the subroutine.

       shadertype
	   Specifies the shader stage from which to query for the subroutine parameter.  shadertype must be one of GL_VERTEX_SHADER,
	   GL_TESS_CONTROL_SHADER, GL_TESS_EVALUATION_SHADER, GL_GEOMETRY_SHADER or GL_FRAGMENT_SHADER.

       index
	   Specifies the index of the shader subroutine uniform.

       pname
	   Specifies the parameter of the shader subroutine uniform to query.  pname must be GL_NUM_COMPATIBLE_SUBROUTINES,
	   GL_COMPATIBLE_SUBROUTINES, GL_UNIFORM_SIZE or GL_UNIFORM_NAME_LENGTH.

       values
	   Specifies the address of a into which the queried value or values will be placed.

DESCRIPTION

       glGetActiveSubroutineUniform queries a parameter of an active shader subroutine uniform.  program contains the name of the program
       containing the uniform.	shadertype specifies the stage which which the uniform location, given by index, is valid.  index must be between
       zero and the value of GL_ACTIVE_SUBROUTINE_UNIFORMS minus one for the shader stage.

       If pname is GL_NUM_COMPATIBLE_SUBROUTINES, a single integer indicating the number of subroutines that can be assigned to the uniform is
       returned in values.

       If pname is GL_COMPATIBLE_SUBROUTINES, an array of integers is returned in values, with each integer specifying the index of an active
       subroutine that can be assigned to the selected subroutine uniform. The number of integers returned is the same as the value returned for
       GL_NUM_COMPATIBLE_SUBROUTINES.

       If pname is GL_UNIFORM_SIZE, a single integer is returned in values. If the selected subroutine uniform is an array, the declared size of
       the array is returned; otherwise, one is returned.

       If pname is GL_UNIFORM_NAME_LENGTH, a single integer specifying the length of the subroutine uniform name (including the terminating null
       character) is returned in values.

ERRORS

       GL_INVALID_ENUM is generated if shadertype or pname is not one of the accepted values.

       GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_ACTIVE_SUBROUTINES.

       GL_INVALID_VALUE is generated if program is not the name of an existing program object.

ASSOCIATED GETS

       glGetProgramStage() with argument GL_ACTIVE_SUBROUTINE_UNIFORMS

SEE ALSO

       glGetSubroutineIndex(), glGetActiveSubroutineUniformName(), glGetProgramStage()

COPYRIGHT

       Copyright (C) 2010 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/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						  GLGETACTIVESUBROUTIN(3G)

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

NAME

       glGetActiveSubroutineUniformName - query the name of an active shader subroutine uniform

C SPECIFICATION

       void glGetActiveSubroutineUniformName(GLuint program, GLenum shadertype, GLuint index, GLsizei bufsize, GLsizei *length, GLchar *name);

PARAMETERS

       program
	   Specifies the name of the program containing the subroutine.

       shadertype
	   Specifies the shader stage from which to query for the subroutine parameter.  shadertype must be one of GL_VERTEX_SHADER,
	   GL_TESS_CONTROL_SHADER, GL_TESS_EVALUATION_SHADER, GL_GEOMETRY_SHADER or GL_FRAGMENT_SHADER.

       index
	   Specifies the index of the shader subroutine uniform.

       bufsize
	   Specifies the size of the buffer whose address is given in name.

       length
	   Specifies the address of a variable into which is written the number of characters copied into name.

       name
	   Specifies the address of a buffer that will receive the name of the specified shader subroutine uniform.

DESCRIPTION

       glGetActiveSubroutineUniformName retrieves the name of an active shader subroutine uniform.  program contains the name of the program
       containing the uniform.	shadertype specifies the stage for which which the uniform location, given by index, is valid.	index must be
       between zero and the value of GL_ACTIVE_SUBROUTINE_UNIFORMS minus one for the shader stage.

       The uniform name is returned as a null-terminated string in name. The actual number of characters written into name, excluding the null
       terminator is returned in length. If length is NULL, no length is returned. The maximum number of characters that may be written into name,
       including the null terminator, is specified by bufsize. The length of the longest subroutine uniform name in program and shadertype is
       given by the value of GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH, which can be queried with glGetProgramStage().

ERRORS

       GL_INVALID_ENUM is generated if shadertype or pname is not one of the accepted values.

       GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_ACTIVE_SUBROUTINES.

       GL_INVALID_VALUE is generated if program is not the name of an existing program object.

ASSOCIATED GETS

       glGetProgramStage() with argument GL_ACTIVE_SUBROUTINE_UNIFORMS

SEE ALSO

       glGetSubroutineIndex(), glGetActiveSubroutineUniform(), glGetProgramStage()

COPYRIGHT

       Copyright (C) 2010 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/.

[FIXME: source] 						    05/30/2012						  GLGETACTIVESUBROUTIN(3G)

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glgetactivesubroutineuniform(3g) [centos man page]

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