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88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
#include "material.hpp"
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#include <osg/Depth>
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#include <osg/TexEnvCombine>
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#include <osg/Texture2D>
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#include <osg/TexMat>
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#include <osg/Material>
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#include <osg/TexEnvCombine>
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namespace Terrain
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{
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FixedFunctionTechnique::FixedFunctionTechnique(const std::vector<osg::ref_ptr<osg::Texture2D> >& layers,
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const std::vector<osg::ref_ptr<osg::Texture2D> >& blendmaps)
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{
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bool firstLayer = true;
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int i=0;
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for (std::vector<osg::ref_ptr<osg::Texture2D> >::const_iterator it = layers.begin(); it != layers.end(); ++it)
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{
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osg::ref_ptr<osg::StateSet> stateset (new osg::StateSet);
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if (!firstLayer)
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{
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stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
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osg::ref_ptr<osg::Depth> depth (new osg::Depth);
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depth->setFunction(osg::Depth::EQUAL);
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stateset->setAttributeAndModes(depth, osg::StateAttribute::ON);
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}
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int texunit = 0;
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if(!firstLayer)
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{
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osg::ref_ptr<osg::Texture2D> blendmap = blendmaps.at(i++);
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stateset->setTextureAttributeAndModes(texunit, blendmap.get());
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// This is to map corner vertices directly to the center of a blendmap texel.
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osg::Matrixf texMat;
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float scale = (16/(16.f+1.f));
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texMat.preMultTranslate(osg::Vec3f(0.5f, 0.5f, 0.f));
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texMat.preMultScale(osg::Vec3f(scale, scale, 1.f));
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texMat.preMultTranslate(osg::Vec3f(-0.5f, -0.5f, 0.f));
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stateset->setTextureAttributeAndModes(texunit, new osg::TexMat(texMat));
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osg::ref_ptr<osg::TexEnvCombine> texEnvCombine (new osg::TexEnvCombine);
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texEnvCombine->setCombine_RGB(osg::TexEnvCombine::REPLACE);
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texEnvCombine->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
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stateset->setTextureAttributeAndModes(texunit, texEnvCombine, osg::StateAttribute::ON);
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++texunit;
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}
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// Add the actual layer texture multiplied by the alpha map.
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osg::ref_ptr<osg::Texture2D> tex = *it;
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stateset->setTextureAttributeAndModes(texunit, tex.get());
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osg::ref_ptr<osg::TexMat> texMat (new osg::TexMat);
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float scale = 16.f;
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texMat->setMatrix(osg::Matrix::scale(osg::Vec3f(scale,scale,1.f)));
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stateset->setTextureAttributeAndModes(texunit, texMat, osg::StateAttribute::ON);
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firstLayer = false;
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addPass(stateset);
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}
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}
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Effect::Effect(const std::vector<osg::ref_ptr<osg::Texture2D> > &layers, const std::vector<osg::ref_ptr<osg::Texture2D> > &blendmaps)
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: mLayers(layers)
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, mBlendmaps(blendmaps)
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{
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osg::ref_ptr<osg::Material> material (new osg::Material);
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material->setColorMode(osg::Material::AMBIENT_AND_DIFFUSE);
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getOrCreateStateSet()->setAttributeAndModes(material, osg::StateAttribute::ON);
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selectTechnique(0);
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}
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bool Effect::define_techniques()
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{
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addTechnique(new FixedFunctionTechnique(mLayers, mBlendmaps));
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return true;
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}
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}
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