1 /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version. The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * OpenSceneGraph Public License for more details.
12 */
13 #include <osg/PatchParameter>
14 #include <osg/State>
15 #include <osg/Notify>
16 #include <osg/io_utils>
17
18 using namespace osg;
19
PatchParameter(GLint vertices)20 PatchParameter::PatchParameter(GLint vertices):
21 _vertices(vertices),
22 _patchDefaultInnerLevel(1.0f,1.0f),
23 _patchDefaultOuterLevel(1.0f,1.0f,1.0f,1.0f)
24 {
25 }
26
27
~PatchParameter()28 PatchParameter::~PatchParameter()
29 {
30 }
31
apply(State & state) const32 void PatchParameter::apply(State& state) const
33 {
34 GLExtensions* extensions = state.get<GLExtensions>();
35 if (extensions->areTessellationShadersSupported )
36 {
37
38 extensions->glPatchParameteri( GL_PATCH_VERTICES, _vertices );
39 extensions->glPatchParameterfv( GL_PATCH_DEFAULT_INNER_LEVEL, _patchDefaultInnerLevel.ptr() );
40 extensions->glPatchParameterfv( GL_PATCH_DEFAULT_OUTER_LEVEL, _patchDefaultOuterLevel.ptr() );
41 }
42 }
43