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OpenSceneGraph/examples/osgvertexprogram/osgvertexprogram.cpp
Robert Osfield 6a67be2e32 Introduced CMake option OSG_PROVIDE_READFILE option that defaults to ON, but when switched to OFF disables the building of the osgDB::read*File() methods, 
forcing users to use osgDB::readRef*File() methods.  The later is preferable as it closes a potential threading bug when using paging databases in conjunction
with the osgDB::Registry Object Cache.  This threading bug occurs when one thread gets an object from the Cache via an osgDB::read*File() call where only
a pointer to the object is passed back, so taking a reference to the object is delayed till it gets reassigned to a ref_ptr<>, but at the same time another
thread calls a flush of the Object Cache deleting this object as it's referenceCount is now zero.  Using osgDB::readREf*File() makes sure the a ref_ptr<> is
passed back and the referenceCount never goes to zero.

To ensure the OSG builds when OSG_PROVIDE_READFILE is to OFF the many cases of osgDB::read*File() usage had to be replaced with a ref_ptr<> osgDB::readRef*File()
usage.  The avoid this change causing lots of other client code to be rewritten to handle the use of ref_ptr<> in place of C pointer I introduced a serious of
templte methods in various class to adapt ref_ptr<> to the underly C pointer to be passed to old OSG API's, example of this is found in include/osg/Group:

    bool addChild(Node* child); // old method which can only be used with a Node*

    tempalte<class T> bool addChild(const osg::ref_ptr<T>& child) { return addChild(child.get()); } // adapter template method

These changes together cover 149 modified files, so it's a large submission. This extent of changes are warrent to make use of the Object Cache
and multi-threaded loaded more robust.



git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.4@15165 16af8721-9629-0410-8352-f15c8da7e697
2015-10-22 14:14:53 +00:00

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/* OpenSceneGraph example, osgvertexprogram.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osg/Vec3>
#include <osg/Vec4>
#include <osg/Quat>
#include <osg/Matrix>
#include <osg/ShapeDrawable>
#include <osg/Geometry>
#include <osg/Geode>
#include <osg/Transform>
#include <osg/Material>
#include <osg/Depth>
#include <osg/CullFace>
#include <osg/TexMat>
#include <osg/TexGen>
#include <osg/TexEnv>
#include <osg/TexEnvCombine>
#include <osg/TextureCubeMap>
#include <osg/VertexProgram>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgUtil/SmoothingVisitor>
#include <osgUtil/Optimizer>
#include <osgViewer/Viewer>
#include <iostream>
float refract = 1.02; // ratio of indicies of refraction
float fresnel = 0.2; // Fresnel multiplier
const char vpstr[] =
"!!ARBvp1.0 # Refraction \n"
" \n"
"ATTRIB iPos = vertex.position; \n"
"#ATTRIB iCol = vertex.color.primary; \n"
"ATTRIB iNormal = vertex.normal; \n"
"PARAM esEyePos = { 0, 0, 0, 1 }; \n"
"PARAM const0123 = { 0, 1, 2, 3 }; \n"
"PARAM fresnel = program.local[0]; \n"
"PARAM refract = program.local[1]; \n"
"PARAM itMV[4] = { state.matrix.modelview.invtrans }; \n"
"PARAM MVP[4] = { state.matrix.mvp }; \n"
"PARAM MV[4] = { state.matrix.modelview }; \n"
"PARAM texmat[4] = { state.matrix.texture[0] }; \n"
"TEMP esPos; # position in eye-space \n"
"TEMP esNormal; # normal in eye-space \n"
"TEMP tmp, IdotN, K; \n"
"TEMP esE; # eye vector \n"
"TEMP esI; # incident vector (=-E) \n"
"TEMP esR; # first refract- then reflect-vector \n"
"OUTPUT oPos = result.position; \n"
"OUTPUT oColor = result.color; \n"
"OUTPUT oRefractMap = result.texcoord[0]; \n"
"OUTPUT oReflectMap = result.texcoord[1]; \n"
" \n"
"# transform vertex to clip space \n"
"DP4 oPos.x, MVP[0], iPos; \n"
"DP4 oPos.y, MVP[1], iPos; \n"
"DP4 oPos.z, MVP[2], iPos; \n"
"DP4 oPos.w, MVP[3], iPos; \n"
" \n"
"# Transform the normal to eye space. \n"
"DP3 esNormal.x, itMV[0], iNormal; \n"
"DP3 esNormal.y, itMV[1], iNormal; \n"
"DP3 esNormal.z, itMV[2], iNormal; \n"
" \n"
"# normalize normal \n"
"DP3 esNormal.w, esNormal, esNormal; \n"
"RSQ esNormal.w, esNormal.w; \n"
"MUL esNormal, esNormal, esNormal.w; \n"
" \n"
"# transform vertex position to eye space \n"
"DP4 esPos.x, MV[0], iPos; \n"
"DP4 esPos.y, MV[1], iPos; \n"
"DP4 esPos.z, MV[2], iPos; \n"
"DP4 esPos.w, MV[3], iPos; \n"
" \n"
"# vertex to eye vector \n"
"ADD esE, -esPos, esEyePos; \n"
"#MOV esE, -esPos; \n"
" \n"
"# normalize eye vector \n"
"DP3 esE.w, esE, esE; \n"
"RSQ esE.w, esE.w; \n"
"MUL esE, esE, esE.w; \n"
" \n"
"# calculate some handy values \n"
"MOV esI, -esE; \n"
"DP3 IdotN, esNormal, esI; \n"
" \n"
"# calculate refraction vector, Renderman style \n"
" \n"
"# k = 1-index*index*(1-(I dot N)^2) \n"
"MAD tmp, -IdotN, IdotN, const0123.y; \n"
"MUL tmp, tmp, refract.y; \n"
"ADD K.x, const0123.y, -tmp; \n"
" \n"
"# k<0, R = [0,0,0] \n"
"# k>=0, R = index*I-(index*(I dot N) + sqrt(k))*N \n"
"RSQ K.y, K.x; \n"
"RCP K.y, K.y; # K.y = sqrt(k) \n"
"MAD tmp.x, refract.x, IdotN, K.y; \n"
"MUL tmp, esNormal, tmp.x; \n"
"MAD esR, refract.x, esI, tmp; \n"
" \n"
"# transform refracted ray by cubemap transform \n"
"DP3 oRefractMap.x, texmat[0], esR; \n"
"DP3 oRefractMap.y, texmat[1], esR; \n"
"DP3 oRefractMap.z, texmat[2], esR; \n"
" \n"
"# calculate reflection vector \n"
"# R = 2*N*(N dot E)-E \n"
"MUL tmp, esNormal, const0123.z; \n"
"DP3 esR.w, esNormal, esE; \n"
"MAD esR, esR.w, tmp, -esE; \n"
" \n"
"# transform reflected ray by cubemap transform \n"
"DP3 oReflectMap.x, texmat[0], esR; \n"
"DP3 oReflectMap.y, texmat[1], esR; \n"
"DP3 oReflectMap.z, texmat[2], esR; \n"
" \n"
"# Fresnel approximation = fresnel*(1-(N dot I))^2 \n"
"ADD tmp.x, const0123.y, -IdotN; \n"
"MUL tmp.x, tmp.x, tmp.x; \n"
"MUL oColor, tmp.x, fresnel; \n"
" \n"
"END \n";
osg::TextureCubeMap* readCubeMap()
{
osg::TextureCubeMap* cubemap = new osg::TextureCubeMap;
//#define CUBEMAP_FILENAME(face) "nvlobby_" #face ".png"
//#define CUBEMAP_FILENAME(face) "Cubemap_axis/" #face ".png"
#define CUBEMAP_FILENAME(face) "Cubemap_snow/" #face ".jpg"
osg::ref_ptr<osg::Image>imagePosX = osgDB::readRefImageFile(CUBEMAP_FILENAME(posx));
osg::ref_ptr<osg::Image>imageNegX = osgDB::readRefImageFile(CUBEMAP_FILENAME(negx));
osg::ref_ptr<osg::Image>imagePosY = osgDB::readRefImageFile(CUBEMAP_FILENAME(posy));
osg::ref_ptr<osg::Image>imageNegY = osgDB::readRefImageFile(CUBEMAP_FILENAME(negy));
osg::ref_ptr<osg::Image>imagePosZ = osgDB::readRefImageFile(CUBEMAP_FILENAME(posz));
osg::ref_ptr<osg::Image>imageNegZ = osgDB::readRefImageFile(CUBEMAP_FILENAME(negz));
if (imagePosX && imageNegX && imagePosY && imageNegY && imagePosZ && imageNegZ)
{
cubemap->setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX);
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX);
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY);
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY);
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ);
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ);
cubemap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
cubemap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
cubemap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
cubemap->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR);
cubemap->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
}
return cubemap;
}
// Update texture matrix for cubemaps
struct TexMatCallback : public osg::NodeCallback
{
public:
TexMatCallback(osg::TexMat& tm) :
_texMat(tm)
{
}
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
const osg::Matrix& MV = *(cv->getModelViewMatrix());
const osg::Matrix R = osg::Matrix::rotate( osg::DegreesToRadians(112.0f), 0.0f,0.0f,1.0f)*
osg::Matrix::rotate( osg::DegreesToRadians(90.0f), 1.0f,0.0f,0.0f);
osg::Quat q = MV.getRotate();
const osg::Matrix C = osg::Matrix::rotate( q.inverse() );
_texMat.setMatrix( C*R );
}
traverse(node,nv);
}
osg::TexMat& _texMat;
};
class MoveEarthySkyWithEyePointTransform : public osg::Transform
{
public:
/** Get the transformation matrix which moves from local coords to world coords.*/
virtual bool computeLocalToWorldMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv->getEyeLocal();
matrix.preMultTranslate(eyePointLocal);
}
return true;
}
/** Get the transformation matrix which moves from world coords to local coords.*/
virtual bool computeWorldToLocalMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv->getEyeLocal();
matrix.postMultTranslate(-eyePointLocal);
}
return true;
}
};
osg::Node* createSkyBox()
{
osg::StateSet* stateset = new osg::StateSet();
osg::TexEnv* te = new osg::TexEnv;
te->setMode(osg::TexEnv::REPLACE);
stateset->setTextureAttributeAndModes(0, te, osg::StateAttribute::ON);
osg::TexGen *tg = new osg::TexGen;
tg->setMode(osg::TexGen::NORMAL_MAP);
stateset->setTextureAttributeAndModes(0, tg, osg::StateAttribute::ON);
osg::TexMat *tm = new osg::TexMat;
stateset->setTextureAttribute(0, tm);
osg::TextureCubeMap* skymap = readCubeMap();
stateset->setTextureAttributeAndModes(0, skymap, osg::StateAttribute::ON);
stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
stateset->setMode( GL_CULL_FACE, osg::StateAttribute::OFF );
// clear the depth to the far plane.
osg::Depth* depth = new osg::Depth;
depth->setFunction(osg::Depth::ALWAYS);
depth->setRange(1.0,1.0);
stateset->setAttributeAndModes(depth, osg::StateAttribute::ON );
stateset->setRenderBinDetails(-1,"RenderBin");
osg::Drawable* drawable = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),1));
osg::Geode* geode = new osg::Geode;
geode->setCullingActive(false);
geode->setStateSet( stateset );
geode->addDrawable(drawable);
osg::Transform* transform = new MoveEarthySkyWithEyePointTransform;
transform->setCullingActive(false);
transform->addChild(geode);
osg::ClearNode* clearNode = new osg::ClearNode;
// clearNode->setRequiresClear(false);
clearNode->setCullCallback(new TexMatCallback(*tm));
clearNode->addChild(transform);
return clearNode;
}
osg::Node* addRefractStateSet(osg::Node* node)
{
osg::StateSet* stateset = new osg::StateSet();
osg::TextureCubeMap* reflectmap = readCubeMap();
stateset->setTextureAttributeAndModes( 0, reflectmap, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE );
stateset->setTextureAttributeAndModes( 1, reflectmap, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE );
osg::TexMat* texMat = new osg::TexMat;
stateset->setTextureAttribute(0, texMat);
// ---------------------------------------------------
// Vertex Program
// ---------------------------------------------------
osg::VertexProgram* vp = new osg::VertexProgram();
vp->setVertexProgram( vpstr );
vp->setProgramLocalParameter( 0, osg::Vec4( fresnel, fresnel, fresnel, 1.0f ) );
vp->setProgramLocalParameter( 1, osg::Vec4( refract, refract*refract, 0.0f, 0.0f ) );
stateset->setAttributeAndModes( vp, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE );
// ---------------------------------------------------
// fragment = refraction*(1-fresnel) + reflection*fresnel
// T0 = texture unit 0, refraction map
// T1 = texture unit 1, reflection map
// C.rgb = primary color, water color
// C.a = primary color, fresnel factor
// Cp = result from previous texture environment
// ---------------------------------------------------
// REPLACE function: Arg0
// = T0
osg::TexEnvCombine *te0 = new osg::TexEnvCombine;
te0->setCombine_RGB(osg::TexEnvCombine::REPLACE);
te0->setSource0_RGB(osg::TexEnvCombine::TEXTURE0);
te0->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
// INTERPOLATE function: Arg0 * (Arg2) + Arg1 * (1-Arg2)
// = T1 * C0.a + Cp * (1-C0.a)
osg::TexEnvCombine *te1 = new osg::TexEnvCombine;
// rgb = Cp + Ct
te1->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
te1->setSource0_RGB(osg::TexEnvCombine::TEXTURE1);
te1->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
te1->setSource1_RGB(osg::TexEnvCombine::PREVIOUS);
te1->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
te1->setSource2_RGB(osg::TexEnvCombine::PRIMARY_COLOR);
te1->setOperand2_RGB(osg::TexEnvCombine::SRC_COLOR);
stateset->setTextureAttributeAndModes(0, te0, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
stateset->setTextureAttributeAndModes(1, te1, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
osg::Group* group = new osg::Group;
group->addChild(node);
group->setCullCallback(new TexMatCallback(*texMat));
group->setStateSet( stateset );
return group;
}
int main(int argc, char *argv[])
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
// construct the viewer.
osgViewer::Viewer viewer;
osg::Group* rootnode = new osg::Group;
rootnode->addChild(createSkyBox());
// load the nodes from the commandline arguments.
osg::ref_ptr<osg::Node> model = osgDB::readRefNodeFiles(arguments);
if (!model)
{
const float radius = 1.0f;
osg::Geode* geode = new osg::Geode;
geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),radius)));
model = geode;
}
// run optimization over the scene graph
osgUtil::Optimizer optimzer;
optimzer.optimize(model);
// create normals.
osgUtil::SmoothingVisitor smoother;
model->accept(smoother);
rootnode->addChild( addRefractStateSet(model.get()) );
// add a viewport to the viewer and attach the scene graph.
viewer.setSceneData(rootnode);
// create the windows and run the threads.
viewer.realize();
// now check to see if vertex program is supported.
osgViewer::Viewer::Windows windows;
viewer.getWindows(windows);
for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
itr != windows.end();
++itr)
{
unsigned int contextID = (*itr)->getState()->getContextID();
osg::GLExtensions* vpExt = osg::GLExtensions::Get(contextID,false);
if (vpExt)
{
if (!vpExt->isVertexProgramSupported)
{
std::cout<<"Warning: ARB_vertex_program not supported by OpenGL drivers, unable to run application."<<std::endl;
return 1;
}
}
}
return viewer.run();
}
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