glpatchparameter(3g) [centos man page]

GLPATCHPARAMETER(3G)						   OpenGL Manual					      GLPATCHPARAMETER(3G)

NAME

       glPatchParameter - specifies the parameters for patch primitives

C SPECIFICATION

       void glPatchParameteri(GLenum pname, GLint value);

       void glPatchParameterfv(GLenum pname, const GLfloat *values);

PARAMETERS

       pname
	   Specifies the name of the parameter to set. The symbolc constants GL_PATCH_VERTICES, GL_PATCH_DEFAULT_OUTER_LEVEL, and
	   GL_PATCH_DEFAULT_INNER_LEVEL are accepted.

       value
	   Specifies the new value for the parameter given by pname.

       values
	   Specifies the address of an array containing the new values for the parameter given by pname.

DESCRIPTION

       glPatchParameter specifies the parameters that will be used for patch primitives.  pname specifies the parameter to modify and must be
       either GL_PATCH_VERTICES, GL_PATCH_DEFAULT_OUTER_LEVEL or GL_PATCH_DEFAULT_INNER_LEVEL. For glPatchParameteri, value specifies the new
       value for the parameter specified by pname. For glPatchParameterfv, values specifies the address of an array containing the new values for
       the parameter specified by pname.

       When pname is GL_PATCH_VERTICES, value specifies the number of vertices that will be used to make up a single patch primitive. Patch
       primitives are consumed by the tessellation control shader (if present) and subsequently used for tessellation. When primitives are
       specified using glDrawArrays() or a similar function, each patch will be made from parameter control points, each represented by a vertex
       taken from the enabeld vertex arrays.  parameter must be greater than zero, and less than or equal to the value of GL_MAX_PATCH_VERTICES.

       When pname is GL_PATCH_DEFAULT_OUTER_LEVEL or GL_PATCH_DEFAULT_INNER_LEVEL, values contains the address of an array contiaining the default
       outer or inner tessellation levels, respectively, to be used when no tessellation control shader is present.

ERRORS

       GL_INVALID_ENUM is generated if pname is not an accepted value.

       GL_INVALID_VALUE is generated if pname is GL_PATCH_VERTICES and value is less than or equal to zero, or greater than the value of
       GL_MAX_PATCH_VERTICES.

SEE ALSO

       glDrawArrays(), glDrawArraysInstanced(), glDrawElements(), glDrawRangeElements(),

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						      GLPATCHPARAMETER(3G)

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

NAME

       glGetProgramStage - retrieve properties of a program object corresponding to a specified shader stage

C SPECIFICATION

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

PARAMETERS

       program
	   Specifies the name of the program containing shader stage.

       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.

       pname
	   Specifies the parameter of the shader to query.  pname must be GL_ACTIVE_SUBROUTINE_UNIFORMS, GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS,
	   GL_ACTIVE_SUBROUTINES, GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH, or GL_ACTIVE_SUBROUTINE_MAX_LENGTH.

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

DESCRIPTION

       glGetProgramStage queries a parameter of a shader stage attached to a program object.  program contains the name of the program to which
       the shader is attached.	shadertype specifies the stage from which to query the parameter.  pname specifies which parameter should be
       queried. The value or values of the parameter to be queried is returned in the variable whose address is given in values.

       If pname is GL_ACTIVE_SUBROUTINE_UNIFORMS, the number of active subroutine variables in the stage is returned in values.

       If pname is GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS, the number of active subroutine variable locations in the stage is returned in values.

       If pname is GL_ACTIVE_SUBROUTINES, the number of active subroutines in the stage is returned in values.

       If pname is GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH, the length of the longest subroutine uniform for the stage is returned in values.

       If pname is GL_ACTIVE_SUBROUTINE_MAX_LENGTH, the length of the longest subroutine name for the stage is returned in values. The returned
       name length includes space for the null-terminator.

       If there is no shader present of type shadertype, the returned value will be consistent with a shader containing no subroutines or
       subroutine uniforms.

ERRORS

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

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

SEE ALSO

       glGetProgram()

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						     GLGETPROGRAMSTAGE(3G)