glPatchParameter man page on RedHat
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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 © 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 03/16/2013 GLPATCHPARAMETER(3G)
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