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Added osgFX::MultiTextureControl node for managing blending between

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different texture layers.
This commit is contained in:
Robert Osfield
2005-03-09 16:54:10 +00:00
parent 8dc1be6707
commit 6a103aa413
18 changed files with 593 additions and 333 deletions
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178
src/osgFX/MultiTextureControl.cpp Normal file
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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osg/TexEnv>
#include <osg/TexEnvCombine>
#include <osgFX/MultiTextureControl>
using namespace osgFX;
MultiTextureControl::MultiTextureControl()
{
}
MultiTextureControl::MultiTextureControl(const MultiTextureControl& copy, const osg::CopyOp& copyop):
Group(copy,copyop),
_textureWeightList(copy._textureWeightList)
{
updateStateSet();
}
void MultiTextureControl::setTextureWeight(unsigned int unit, float weight)
{
if (unit >= _textureWeightList.size())
{
_textureWeightList.resize(unit+1,0.0f);
}
_textureWeightList[unit] = weight;
updateStateSet();
}
void MultiTextureControl::updateStateSet()
{
osg::StateSet* stateset = getOrCreateStateSet();
stateset->clear();
if (_textureWeightList.size()==1)
{
osg::TexEnv* texenv = new osg::TexEnv(osg::TexEnv::MODULATE);
stateset->setTextureAttribute(0, texenv);
}
if (_textureWeightList.size()==2)
{
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texenv->setSource0_RGB(osg::TexEnvCombine::TEXTURE0+0);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_RGB(osg::TexEnvCombine::TEXTURE0+1);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource2_RGB(osg::TexEnvCombine::CONSTANT);
texenv->setOperand2_RGB(osg::TexEnvCombine::SRC_COLOR);
float r = _textureWeightList[0]/(_textureWeightList[0]+_textureWeightList[1]);
texenv->setConstantColor(osg::Vec4(r,r,r,r));
stateset->setTextureAttribute(0, texenv);
}
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::MODULATE);
texenv->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_RGB(osg::TexEnvCombine::PRIMARY_COLOR);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
stateset->setTextureAttribute(1, texenv);
}
}
if (_textureWeightList.size()==3)
{
float b = (_textureWeightList[0]+_textureWeightList[1])/(_textureWeightList[0]+_textureWeightList[1]+_textureWeightList[2]);
float a = _textureWeightList[0]/(_textureWeightList[0]+_textureWeightList[1]);
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texenv->setSource0_RGB(osg::TexEnvCombine::TEXTURE0+0);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_RGB(osg::TexEnvCombine::TEXTURE0+1);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource2_RGB(osg::TexEnvCombine::CONSTANT);
texenv->setOperand2_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setConstantColor(osg::Vec4(a,a,a,a));
stateset->setTextureAttribute(0, texenv);
}
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texenv->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_RGB(osg::TexEnvCombine::TEXTURE0+2);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource2_RGB(osg::TexEnvCombine::CONSTANT);
texenv->setOperand2_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setConstantColor(osg::Vec4(b,b,b,b));
stateset->setTextureAttribute(1, texenv);
}
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::MODULATE);
texenv->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_RGB(osg::TexEnvCombine::PRIMARY_COLOR);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
stateset->setTextureAttribute(2, texenv);
}
}
/*
bool firstActiveTextureUnit = true;
for(unsigned int unit = 0;
unit < _textureWeightList.size();
++unit)
{
float r = _textureWeightList[unit];
if (r==0.0f)
{
stateset->setTextureMode(unit, GL_TEXTURE_2D, osg::StateAttribute::OFF);
}
else
{
stateset->setTextureMode(unit, GL_TEXTURE_2D, osg::StateAttribute::ON);
if (firstActiveTextureUnit)
{
stateset->setTextureAttribute(unit, new osg::TexEnv);
firstActiveTextureUnit = false;
}
else
{
osg::TexEnvCombine* texenv = new osg::TexEnvCombine;
texenv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texenv->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
texenv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource1_RGB(osg::TexEnvCombine::TEXTURE);
texenv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setSource2_RGB(osg::TexEnvCombine::CONSTANT);
texenv->setOperand2_RGB(osg::TexEnvCombine::SRC_COLOR);
texenv->setConstantColor(osg::Vec4(r,r,r,r));
stateset->setTextureAttribute(unit, texenv);
}
}
}
*/
}