Hi,
I've been trying to map a 32 bit float texture onto a quad for a while without
success. Below is my code, can anyone tell me what I am doing wrong? This code
opens a float32 image file, reads it into an array, creates an osg::Image with
the array data, creates an osg::Texture2D with the image, then maps that
texture onto a quad.
Thank you!
Cheers,
Paul
Code:
#include "sgp_core/TArrayAlgo.h"
#include <osgViewer/Viewer>
#include <osg/Texture2D>
#include <string>
// Imply namespaces
using namespace sgp_core;
using namespace std;
// Scene graph root and HUD
osg::ref_ptr<osg::Group> SceneGraph = new osg::Group();
/**
* Create an OSG Image given a float data array
*/
osg::ref_ptr<osg::Image> CreateImage( TScalarArray<float>& rawImage )
{
osg::ref_ptr<osg::Image> rImage = new osg::Image();
unsigned char* pData = reinterpret_cast<unsigned char*>( rawImage.c_data() );
size_t arrayDepth = 1;
rImage->setImage(
rawImage.rows(),
rawImage.cols(),
arrayDepth,
GL_LUMINANCE,
GL_RGB32F_ARB,
GL_FLOAT,
pData,
osg::Image::NO_DELETE
);
return rImage;
} // end CreateImage()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/**
* Create a unit textured quad (Geometry) given it's position, size, and an image
*/
osg::ref_ptr<osg::Geometry> CreateTexturedQuad( osg::Image* pImage )
{
float xDim = pImage->t();
float yDim = pImage->s();
float32 xLrc = -xDim*0.5f;
float32 yLrc = -yDim*0.5f;
float32 zLrc = 0;
osg::ref_ptr<osg::Geometry> rQuad =
osg::createTexturedQuadGeometry(
osg::Vec3( xLrc, yLrc, zLrc ),
osg::Vec3( xDim, 0.0f, 0.0f ),
osg::Vec3( 0.0f, yDim, 0.0f )
);
osg::Texture2D* pTex = new osg::Texture2D();
pTex->setInternalFormat( GL_LUMINANCE32F_ARB );
pTex->setFilter( osg::Texture::MIN_FILTER, osg::Texture::LINEAR );
pTex->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
pTex->setWrap( osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE );
pTex->setWrap( osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE );
pTex->setImage( pImage );
osg::StateSet* pSS = rQuad->getOrCreateStateSet();
pSS->setTextureAttributeAndModes( 0, pTex );
return rQuad;
} // CreateTexturedQuad()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
________________________________________________________________________________________________
// Main program
int main( int argc, const char** pArgv )
{
// Parse parameters
osg::ArgumentParser arguments( &argc,const_cast<char**>( pArgv ) );
string description("Scratch Program for Apache DFT Task");
try
{
// Create image array and load image data from disk
string imageFileName( "512x432_FLIR.float" );
TScalarArray<float> rawImage;
readFrom( rawImage, imageFileName );
cout << "IMAGE : " << imageFileName << endl;
cout << "SIZE : " << rawImage.rows() << "x" << rawImage.cols() << endl;
// Create OSG image with the raw data
osg::ref_ptr<osg::Image> rImage = CreateImage( rawImage );
// Create a quad and map the image as a texture on it
osg::ref_ptr<osg::Geometry> rGeom = CreateTexturedQuad( rImage );
osg::ref_ptr<osg::Geode> rQuadGeode = new osg::Geode();
rQuadGeode->addDrawable( rGeom );
SceneGraph->addChild( rQuadGeode );
}
catch( Exception& e )
{
cerr << "ERROR: " << e.what() << endl;
return 1;
}
// Setup viewer
osgViewer::Viewer viewer(arguments);
viewer.setSceneData( SceneGraph.get() );
return viewer.run();
}
// EOF
------------------------
things are more like they are now than they have ever been before
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=66064#66064
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