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 © 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/.