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Added proper osgtexture1D demo - this demo uses a 1D texture to dynamically

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contour the scene.
This commit is contained in:
Robert Osfield
2002-08-27 14:02:19 +00:00
parent 103727f412
commit 4265702c7c
3 changed files with 131 additions and 376 deletions
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4
Make/debugtests.bat
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@@ -91,8 +91,8 @@ echo osgtext
osgtext
more memleaks.log
echo osgtexture1D reflect.rgb lz.rgb
osgtexture1D reflect.rgb lz.rgb
echo osgtexture1D cow.osg
osgtexture1D cow.osg
more memleaks.log
echo osgtexture2D reflect.rgb lz.rgb

4
Make/osgtests.bat
View File

@@ -67,8 +67,8 @@ osgstereoimage dog_left_eye.jpg dog_right_eye.jpg
echo osgtext
osgtext
echo osgtexture1D reflect.rgb lz.rgb
osgtexture1D reflect.rgb lz.rgb
echo osgtexture1D cow.osg
osgtexture1D cow.osg
echo osgtexture2D reflect.rgb lz.rgb
osgtexture2D reflect.rgb lz.rgb

499
src/Demos/osgtexture1D/osgtexture1D.cpp
View File

@@ -1,9 +1,7 @@
#include <osg/Node>
#include <osg/Geometry>
#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/Texture2D>
#include <osg/DrawPixels>
#include <osg/Texture1D>
#include <osg/TexGen>
#include <osg/Material>
#include <osgGA/TrackballManipulator>
#include <osgGA/FlightManipulator>
@@ -16,374 +14,132 @@
#include <osgGLUT/Viewer>
//
// A simple demo demonstrating different texturing modes,
// including using of texture extensions.
//
// Creates a stateset which contains a 1D texture which is populated by contour banded color
// this is then used in conjunction with TexGen to create contoured models, either in
// object linear coords - like contours on a map, or eye linear which contour the distance from
// the eye. An app callback toggles between the two tex gen modes.
osg::StateSet* create1DTextureStateToDecorate(osg::Node* loadedModel)
{
const osg::BoundingSphere& bs = loadedModel->getBound();
osg::Image* image = new osg::Image;
int noPixels = 1024;
// allocate the image data, noPixels x 1 x 1 with 4 rgba floats - equivilant to a Vec4!
image->allocateImage(noPixels,1,1,GL_RGBA,GL_FLOAT);
image->setInternalTextureFormat(GL_RGBA);
typedef std::vector<osg::Vec4> ColorBands;
ColorBands colorbands;
colorbands.push_back(osg::Vec4(0.0f,0.0,0.0,1.0f));
colorbands.push_back(osg::Vec4(1.0f,0.0,0.0,1.0f));
colorbands.push_back(osg::Vec4(1.0f,1.0,0.0,1.0f));
colorbands.push_back(osg::Vec4(0.0f,1.0,0.0,1.0f));
colorbands.push_back(osg::Vec4(0.0f,1.0,1.0,1.0f));
colorbands.push_back(osg::Vec4(0.0f,0.0,1.0,1.0f));
colorbands.push_back(osg::Vec4(1.0f,0.0,1.0,1.0f));
colorbands.push_back(osg::Vec4(1.0f,1.0,1.0,1.0f));
float nobands = colorbands.size();
float delta = nobands/(float)noPixels;
float pos = 0.0f;
// fill in the image data.
osg::Vec4* dataPtr = (osg::Vec4*)image->data();
for(int i=0;i<noPixels;++i,pos+=delta)
{
//float p = floorf(pos);
//float r = pos-p;
//osg::Vec4 color = colorbands[(int)p]*(1.0f-r);
//if (p+1<colorbands.size()) color += colorbands[(int)p+1]*r;
osg::Vec4 color = colorbands[(int)pos];
*dataPtr++ = color;
}
osg::Texture1D* texture = new osg::Texture1D;
texture->setWrap(osg::Texture1D::WRAP_S,osg::Texture1D::MIRROR);
texture->setFilter(osg::Texture1D::MIN_FILTER,osg::Texture1D::LINEAR);
texture->setImage(image);
float zBase = bs.center().z()-bs.radius();
float zScale = 2.0f/bs.radius();
osg::TexGen* texgen = new osg::TexGen;
texgen->setMode(osg::TexGen::OBJECT_LINEAR);
texgen->setPlane(osg::TexGen::S,osg::Vec4(0.0f,0.0f,zScale,-zBase));
osg::Material* material = new osg::Material;
osg::StateSet* stateset = new osg::StateSet;
stateset->setTextureAttribute(0,texture,osg::StateAttribute::OVERRIDE);
stateset->setTextureMode(0,GL_TEXTURE_1D,osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE);
stateset->setTextureMode(0,GL_TEXTURE_2D,osg::StateAttribute::OFF|osg::StateAttribute::OVERRIDE);
stateset->setTextureMode(0,GL_TEXTURE_3D,osg::StateAttribute::OFF|osg::StateAttribute::OVERRIDE);
stateset->setTextureAttribute(0,texgen,osg::StateAttribute::OVERRIDE);
stateset->setTextureMode(0,GL_TEXTURE_GEN_S,osg::StateAttribute::ON|osg::StateAttribute::OVERRIDE);
stateset->setAttribute(material,osg::StateAttribute::OVERRIDE);
return stateset;
}
typedef std::vector< osg::ref_ptr<osg::Image> > ImageList;
class Texture2DCallback : public osg::NodeCallback
// An app callback which alternates the tex gen mode between object linear and eye linear to illustrate what differences it makes.
class AnimateStateCallback : public osg::NodeCallback
{
public:
Texture2DCallback(osg::Texture2D* texture):_texture(texture)
{
_filterRange.push_back(osg::Texture2D::LINEAR);
_filterRange.push_back(osg::Texture2D::LINEAR_MIPMAP_LINEAR);
_filterRange.push_back(osg::Texture2D::LINEAR_MIPMAP_NEAREST);
_filterRange.push_back(osg::Texture2D::NEAREST);
_filterRange.push_back(osg::Texture2D::NEAREST_MIPMAP_LINEAR);
_filterRange.push_back(osg::Texture2D::NEAREST_MIPMAP_NEAREST);
_currPos = 0;
_prevTime = 0.0;
}
AnimateStateCallback() {}
virtual ~Texture2DCallback() {}
virtual void operator()(osg::Node*, osg::NodeVisitor* nv)
void animateState(osg::StateSet* stateset,double time)
{
if (nv->getFrameStamp())
// here we simply get any existing texgen, and then increment its
// plane, pushing the R coordinate through the texture.
osg::StateAttribute* attribute = stateset->getTextureAttribute(0,osg::StateAttribute::TEXGEN);
osg::TexGen* texgen = dynamic_cast<osg::TexGen*>(attribute);
if (texgen)
{
double currTime = nv->getFrameStamp()->getReferenceTime();
if (currTime-_prevTime>1.0)
const double timeInterval = 1.0f;
static double previousTime = time;
static bool state = false;
while (time>previousTime+timeInterval)
{
std::cout<<"Updating texturing filter to "<<std::hex<<_filterRange[_currPos]<<std::dec<<std::endl;
_texture->setFilter(osg::Texture2D::MAG_FILTER,_filterRange[_currPos]);
_currPos++;
if (_currPos>=_filterRange.size()) _currPos=0;
_prevTime = currTime;
previousTime+=timeInterval;
state = !state;
}
if (state)
{
texgen->setMode(osg::TexGen::OBJECT_LINEAR);
}
else
{
texgen->setMode(osg::TexGen::EYE_LINEAR);
}
}
}
osg::ref_ptr<osg::Texture2D> _texture;
std::vector<osg::Texture2D::FilterMode> _filterRange;
osg::uint _currPos;
double _prevTime;
};
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
/**
* Function to read several images files (typically one) as specified
* on the command line, and return them in an ImageList
*/
ImageList getImagesFromFiles(std::vector<std::string>& commandLine)
{
ImageList imageList;
for(std::vector<std::string>::iterator itr=commandLine.begin();
itr!=commandLine.end();
++itr)
{
if ((*itr)[0]!='-')
{
// not an option so assume string is a filename.
osg::Image *image = osgDB::readImageFile( *itr );
if (image)
osg::StateSet* stateset = node->getStateSet();
if (stateset && nv->getFrameStamp())
{
imageList.push_back(image);
// we have an exisitng stateset, so lets animate it.
animateState(stateset,nv->getFrameStamp()->getReferenceTime());
}
}
}
if (imageList.size()==0)
{
osg::notify(osg::WARN) << "No image data loaded."<<std::endl;
}
return imageList;
}
/** create 2,2 square with center at 0,0,0 and aligned along the XZ plan */
osg::Drawable* createSquare(float textureCoordMax=1.0f)
{
// set up the Geometry.
osg::Geometry* geom = new osg::Geometry;
osg::Vec3Array* coords = new osg::Vec3Array(4);
(*coords)[0].set(-1.0f,0.0f,1.0f);
(*coords)[1].set(-1.0f,0.0f,-1.0f);
(*coords)[2].set(1.0f,0.0f,-1.0f);
(*coords)[3].set(1.0f,0.0f,1.0f);
geom->setVertexArray(coords);
osg::Vec3Array* norms = new osg::Vec3Array(1);
(*norms)[0].set(0.0f,-1.0f,0.0f);
geom->setNormalArray(norms);
geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
osg::Vec2Array* tcoords = new osg::Vec2Array(4);
(*tcoords)[0].set(0.0f,textureCoordMax);
(*tcoords)[1].set(0.0f,0.0f);
(*tcoords)[2].set(textureCoordMax,0.0f);
(*tcoords)[3].set(textureCoordMax,textureCoordMax);
geom->setTexCoordArray(0,tcoords);
geom->addPrimitive(osgNew osg::DrawArrays(osg::Primitive::QUADS,0,4));
return geom;
}
osg::Node* createTexturedItem(const osg::Vec3& offset,osg::Texture2D* texture,osg::Node* geometry)
{
// create a tranform node to position each square in appropriate
// place and also to add individual texture set to it, so that
// that state is inherited down to its children.
osg::MatrixTransform* local_transform = new osg::MatrixTransform;
local_transform->postMult(osg::Matrix::translate(offset));
// create the StateSet to store the texture data
osg::StateSet* stateset = new osg::StateSet;
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
// turn the face culling off so you can see the texture from
// all angles.
stateset->setMode(GL_CULL_FACE,osg::StateAttribute::OFF);
// attach the setset to tranform node.
local_transform->setStateSet(stateset);
// add the geode to the transform.
local_transform->addChild(geometry);
return local_transform;
}
osg::Node* createLayer(const osg::Vec3& offset,osg::Image* image,osg::Node* geometry,osg::Node* geometryRep)
{
if (image==NULL) return NULL;
osg::MatrixTransform* top_transform = new osg::MatrixTransform;
top_transform->postMult(osg::Matrix::translate(offset));
osg::Vec3 local_offset(0.0f,0.0f,0.0f);
osg::Vec3 local_delta(3.0f,0.0f,0.0f);
// // use DrawPixels drawable to draw a pixel image.
// {
//
// osg::DrawPixels* drawimage = osgNew osg::DrawPixels;
// drawimage->setPosition(local_offset);
// drawimage->setImage(image);
//
// osg::Geode* geode = osgNew osg::Geode;
// geode->addDrawable(drawimage);
//
// // add the transform node to root group node.
// top_transform->addChild(geode);
//
// local_offset += local_delta;
// }
// defaults mipmapped texturing.
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
local_offset += local_delta;
// top_transform->setAppCallback(new TextureCallback(texture));
}
// bilinear
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
// set up bilinear filtering.
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR_MIPMAP_NEAREST);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
local_offset += local_delta;
}
// trilinear
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
// set up trilinear filtering.
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR_MIPMAP_LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
local_offset += local_delta;
}
// anisotropic
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
// set up anistropic filtering.
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR_MIPMAP_LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture->setMaxAnisotropy(2.0f);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
local_offset += local_delta;
}
// arb compression
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
texture->setInternalFormatMode(osg::Texture2D::USE_ARB_COMPRESSION);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
local_offset += local_delta;
}
// s3tc_dxt1 compression
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
texture->setInternalFormatMode(osg::Texture2D::USE_S3TC_DXT1_COMPRESSION);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometry));
local_offset += local_delta;
}
// default wrap mode. (osg::Texture2D::CLAMP)
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometryRep));
local_offset += local_delta;
}
// clamp-to-edge mode.
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_EDGE);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_EDGE);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometryRep));
local_offset += local_delta;
}
// repeat wrap mode.
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::REPEAT);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::REPEAT);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometryRep));
local_offset += local_delta;
}
// mirror wrap mode.
{
// create the texture attribute
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::MIRROR);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::MIRROR);
// add the transform node to root group node.
top_transform->addChild(createTexturedItem(local_offset,texture,geometryRep));
local_offset += local_delta;
}
return top_transform;
}
osg::Node* createModelFromImages(ImageList& imageList)
{
if (imageList.empty()) return NULL;
// create the root node which will hold the model.
osg::Group* root = new osg::Group();
// create a single drawable to be shared by each texture instance.
osg::Drawable* drawable_noTexCoodRep = createSquare(1.0f);
// add the drawable into a single goede to be shared...
osg::Geode* geode_noTexCoodRep = new osg::Geode();
geode_noTexCoodRep->addDrawable(drawable_noTexCoodRep);
// create a single drawable to be shared by each texture instance.
osg::Drawable* drawable_texCoodRep = createSquare(2.0f);
// add the drawable into a single goede to be shared...
osg::Geode* geode_texCoodRep = new osg::Geode();
geode_texCoodRep->addDrawable(drawable_texCoodRep);
osg::Vec3 offset(0.0f,0.0f,0.0f);
osg::Vec3 delta(0.0f,0.0f,3.0f);
// step through the image list processing each image in turn.
for(ImageList::iterator itr=imageList.begin();
itr!=imageList.end();
++itr)
{
// add the transform node to root group node.
root->addChild(createLayer(offset,itr->get(),geode_noTexCoodRep,geode_texCoodRep));
offset += delta;
}
return root;
}
// note, callback is repsonsible for scenegraph traversal so
// should always include call the traverse(node,nv) to ensure
// that the rest of cullbacks and the scene graph are traversed.
traverse(node,nv);
}
};
void write_usage(std::ostream& out,const std::string& name)
@@ -450,27 +206,26 @@ int main( int argc, char **argv )
osgDB::readCommandLine(commandLine);
// load the images specified on command line
ImageList imageList = getImagesFromFiles(commandLine);
osg::Node* loadedModel = osgDB::readNodeFiles(commandLine);
if (!imageList.empty())
if (loadedModel)
{
// create a model from the images.
osg::Node* rootNode = createModelFromImages(imageList);
imageList.clear();
osg::StateSet* stateset = create1DTextureStateToDecorate(loadedModel);
if (!stateset)
{
std::cout<<"Error: failed to create 1D texture state."<<std::endl;
return 1;
}
loadedModel->setStateSet(stateset);
loadedModel->setAppCallback(new AnimateStateCallback());
// add model to viewer.
viewer.addViewport( rootNode );
// register trackball, flight and drive.
viewer.registerCameraManipulator(new osgGA::TrackballManipulator);
viewer.registerCameraManipulator(new osgGA::FlightManipulator);
viewer.registerCameraManipulator(new osgGA::DriveManipulator);
viewer.addViewport( loadedModel );
viewer.open();
viewer.run();
}
else