This is not related to GLSL, but if someone needs it, I quickly wrote a function that transforms a gray-scale bump map into a normal map: http://pvle.sourceforge.net/Doc/Html/Utility3D_8cpp-source.html#l00115 Hope this may be useful to someone, even if the function is not that clean.
Sukender PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ Le Wed, 26 Nov 2008 13:29:33 +0100, Morné Pistorius <[EMAIL PROTECTED]> a écrit: > Thanks, > I managed to implement a standard bump mapping shader in OSG. Below is a > code snippet that does it if it might help someone else. Shaders are > attached. > > Cheers, > Morne > > osg::Node * VOSGFloorGrid::CreateBumpMappedFloor() > { > const int BASE_TEX_UNIT = 0; > const int BUMP_TEX_UNIT = 1; > const int TANGENT_ATR_UNIT = 6; > const int BINORMAL_ATR_UNIT = 7; > > osg::Geode* geode = new osg::Geode; > > // set up the Geometry. > osg::Geometry* geom = new osg::Geometry; > > osg::Vec3 width, depth, topleft; > topleft = osg::Vec3( -Size/2.0, -Size/2.0, 0.0 ); > width = osg::Vec3( Size, 0.0, 0.0 ); > depth = osg::Vec3( 0.0, Size, 0.0 ); > > osg::Vec3Array* coords = new osg::Vec3Array(4); > (*coords)[0] = topleft; > (*coords)[1] = topleft+width; > (*coords)[2] = topleft+width+depth; > (*coords)[3] = topleft+depth; > > geom->setVertexArray(coords); > > osg::Vec3Array* norms = new osg::Vec3Array(1); > (*norms)[0] = osg::Vec3( 0.0, 1.0, 0.0 ); > > geom->setNormalArray(norms); > geom->setNormalBinding(osg::Geometry::BIND_OVERALL); > > osg::Vec4Array* color = new osg::Vec4Array(1); > (*color)[0] = osg::Vec4(1.0f,1.0f,1.0f,1.0f); > > geom->setColorArray( color ); > geom->setColorBinding( osg::Geometry::BIND_OVERALL ); > > osg::Vec2Array* tcoords = new osg::Vec2Array(4); > float n = 5.0f; // no of times the texture is repeated > (*tcoords)[0].set( 0.0f, 0.0f ); > (*tcoords)[1].set( n, 0.0f ); > (*tcoords)[2].set( n, n ); > (*tcoords)[3].set( 0.0f, n ); > geom->setTexCoordArray( BASE_TEX_UNIT, tcoords ); > geom->setTexCoordArray( BUMP_TEX_UNIT, tcoords ); > > geom->addPrimitiveSet( new osg::DrawArrays( osg::PrimitiveSet::QUADS, 0 , > coords->size() ) ); > geode->addDrawable( geom ); > > // Compute smoothed normals > osgUtil::SmoothingVisitor smoother; > smoother.apply( *geode ); > > // model texture > osg::Texture2D * diffuse = new osg::Texture2D; > diffuse->setImage( osgDB::readImageFile( m_sSystemPath + > "/Resources/Floor.tga" ) ); > diffuse->setWrap( osg::Texture2D::WRAP_S, osg::Texture2D::REPEAT ); > diffuse->setWrap( osg::Texture2D::WRAP_T, osg::Texture2D::REPEAT ); > diffuse->setResizeNonPowerOfTwoHint( false ); > diffuse->setMaxAnisotropy( 8.0f ); > > // bump map texture > osg::Texture2D * normal = new osg::Texture2D; > normal->setImage( osgDB::readImageFile( m_sSystemPath + > "/Resources/FloorNormalMap.tga" ) ); > normal->setWrap( osg::Texture2D::WRAP_S, osg::Texture2D::REPEAT ); > normal->setWrap( osg::Texture2D::WRAP_T, osg::Texture2D::REPEAT ); > normal->setResizeNonPowerOfTwoHint( false ); > normal->setMaxAnisotropy( 8.0f ); > > > ////////////////////////////////////////////////////////////////////////// > // Set up bump mapping shaders > > // Load and compile shader source > osg::Program * bump = new osg::Program; > osg::Shader * bumpVertexShader = new osg::Shader( osg::Shader::VERTEX ); > osg::Shader * bumpPixelShader = new osg::Shader( osg::Shader::FRAGMENT ); > bumpVertexShader->loadShaderSourceFromFile( m_sSystemPath + > "/Resources/bumpmap.vert" ); > bumpPixelShader->loadShaderSourceFromFile( m_sSystemPath + > "/Resources/bumpmap.frag" ); > bump->addShader( bumpVertexShader ); > bump->addShader( bumpPixelShader ); > > // Set up the shader stateset > osg::StateSet * stateset = geode->getOrCreateStateSet(); > stateset->setTextureAttribute( BASE_TEX_UNIT, diffuse ); > stateset->setTextureAttribute( BUMP_TEX_UNIT, normal ); > stateset->setAttributeAndModes( bump, osg::StateAttribute::ON ); > > // Compute tangent space for geometry > osg::ref_ptr< osgUtil::TangentSpaceGenerator > tsg = new > osgUtil::TangentSpaceGenerator; > tsg->generate( geom, BUMP_TEX_UNIT ); > geom->setVertexAttribData( TANGENT_ATR_UNIT, osg::Geometry::ArrayData( > tsg->getTangentArray(), osg::Geometry::BIND_PER_VERTEX, GL_FALSE ) ); > geom->setVertexAttribData( BINORMAL_ATR_UNIT, osg::Geometry::ArrayData( > tsg->getBinormalArray(), osg::Geometry::BIND_PER_VERTEX, GL_FALSE ) ); > bump->addBindAttribLocation( "rm_Tangent", TANGENT_ATR_UNIT ); > bump->addBindAttribLocation( "rm_Binormal", BINORMAL_ATR_UNIT ); > > // Initialise Uniforms > // Vertex shader > osg::Vec3 Pos( 0, 0, 1000 ); > stateset->addUniform( new osg::Uniform( "fvLightPosition", Pos ) ); > stateset->addUniform( new osg::Uniform( "fvEyePosition", Pos ) ); > stateset->addUniform( new osg::Uniform( "bumpMap", BUMP_TEX_UNIT ) ); > stateset->addUniform( new osg::Uniform( "bumpMap", BUMP_TEX_UNIT ) ); > > // Fragment shader > stateset->addUniform( new osg::Uniform( "fvAmbient", osg::Vec4( 0.36, > 0.36, 0.36, 1.0 ) ) ); > stateset->addUniform( new osg::Uniform( "fvSpecular", osg::Vec4( 0.49, > 0.49, 0.49, 1.0 ) ) ); > stateset->addUniform( new osg::Uniform( "fvDiffuse", osg::Vec4( 0.88, > 0.88, 0.88, 1.0 ) ) ); > stateset->addUniform( new osg::Uniform( "fSpecularPower", 100.0f ) ); > > return geode; > } > > > > > On Mon, Nov 24, 2008 at 5:02 PM, Alejandro Aguilar Sierra < > [EMAIL PROTECTED]> wrote: > >> Hi, >> >> I suggest you to see the osgshaders example (how osg deals with glsl) >> and then consult chapter 11 of the orange book (OpenGL shading >> language). You can find the shaders used in the book at >> http://3dshaders.com/ >> >> Hope it helps. >> >> -- A. >> >> On Mon, Nov 24, 2008 at 10:39 AM, Morné Pistorius >> <[EMAIL PROTECTED]> wrote: >> > Hi all, >> > I added bump mapping to a model using osgFX::BumpMapping, but I need >> > something more flexible. My model has two sided lighting and osgFX >> doesn't >> > support that. Do we have GLSL shaders for bumpmapping in OSG? I think >> that >> > would be easier to modify to suit my needs than the assembler coded >> shaders >> > used in osgFX. If anyone has an example of applying normal mapping with >> > shaders in OSG, I would greatly appreciate it. >> > Thank you kindly, >> > Morne >> > _______________________________________________ >> > osg-users mailing list >> > [email protected] >> > >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > >> > >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
