GLGETMULTISAMPLEFV(3G) OpenGL Manual GLGETMULTISAMPLEFV(3G)NAME
glGetMultisamplefv - retrieve the location of a sample
C SPECIFICATION
void glGetMultisamplefv(GLenum pname, GLuint index, GLfloat *val);
PARAMETERS
pname
Specifies the sample parameter name. pname must be GL_SAMPLE_POSITION.
index
Specifies the index of the sample whose position to query.
val
Specifies the address of an array to receive the position of the sample.
DESCRIPTION
glGetMultisamplefv queries the location of a given sample. pname specifies the sample parameter to retrieve and must be
GL_SAMPLE_POSITION. index corresponds to the sample for which the location should be returned. The sample location is returned as two
floating-point values in val[0] and val[1], each between 0 and 1, corresponding to the x and y locations respectively in the GL pixel space
of that sample. (0.5, 0.5) this corresponds to the pixel center. index must be between zero and the value of GL_SAMPLES - 1.
If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples within some
pixels.
ERRORS
GL_INVALID_ENUM is generated if pname is not one GL_SAMPLE_POSITION.
GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_SAMPLES.
SEE ALSO
glGenFramebuffers(), glBindFramebuffer()
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 GLGETMULTISAMPLEFV(3G)
Check Out this Related 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)