FGFS-4.1/OpenSceneGraph
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Added osg::TexMat::s/getScaleByTextureRectangleSize feature that allows

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one to use the osg::TexMat to automatically scale non dimensional tex coordinats to
the size of the last texture rectangle applied.
This commit is contained in:
Robert Osfield
2006-09-04 12:46:49 +00:00
parent a93ca5a089
commit f0277df858
6 changed files with 78 additions and 20 deletions
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33
examples/osgtexturerectangle/osgtexturerectangle.cpp
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@@ -19,6 +19,7 @@
#include <osg/TextureRectangle>
#include <osg/Geometry>
#include <osg/Geode>
#include <osg/TexMat>
#include <osg/Group>
#include <osg/Projection>
@@ -40,10 +41,9 @@
class TexturePanCallback : public osg::NodeCallback
{
public:
TexturePanCallback(osg::Geometry* geom, osg::Image* img,
TexturePanCallback(osg::TexMat* texmat,
double delay = 0.05) :
_geom(geom),
_img(img),
_texmat(texmat),
_phaseS(35.0f),
_phaseT(18.0f),
_phaseScale(5.0f),
@@ -54,7 +54,7 @@ public:
virtual void operator()(osg::Node*, osg::NodeVisitor* nv)
{
if (!_geom || !_img)
if (!_texmat)
return;
if (nv->getFrameStamp()) {
@@ -69,16 +69,11 @@ public:
// calculate new texture coordinates
float s, t;
s = ((sin(rad * _phaseS) + 1) * 0.5f) * (_img->s() * scaleR);
t = ((sin(rad * _phaseT) + 1) * 0.5f) * (_img->t() * scaleR);
s = ((sin(rad * _phaseS) + 1) * 0.5f) * (scaleR);
t = ((sin(rad * _phaseT) + 1) * 0.5f) * (scaleR);
// set new texture coordinate array
osg::Vec2Array* texcoords = (osg::Vec2Array*) _geom->getTexCoordArray(0);
float w = _img->s() * scale, h = _img->t() * scale;
(*texcoords)[0].set(s, t+h);
(*texcoords)[1].set(s, t);
(*texcoords)[2].set(s+w, t);
(*texcoords)[3].set(s+w, t+h);
_texmat->setMatrix(osg::Matrix::translate(s,t,1.0)*osg::Matrix::scale(scale,scale,1.0));
// record time
_prevTime = currTime;
@@ -87,8 +82,7 @@ public:
}
private:
osg::Geometry* _geom;
osg::Image* _img;
osg::TexMat* _texmat;
float _phaseS, _phaseT, _phaseScale;
@@ -148,13 +142,18 @@ osg::Node* createRectangle(osg::BoundingBox& bb,
osg::StateSet* state = geom->getOrCreateStateSet();
state->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
// setup state
osg::TexMat* texmat = new osg::TexMat;
texmat->setScaleByTextureRectangleSize(true);
state->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
// turn off lighting
state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
// install 'update' callback
osg::Geode* geode = new osg::Geode;
geode->addDrawable(geom);
geode->setUpdateCallback(new TexturePanCallback(geom, img));
geode->setUpdateCallback(new TexturePanCallback(texmat));
return geode;
}
@@ -194,7 +193,7 @@ osg::Node* createHUD()
const char* text[] = {
"TextureRectangle Mini-HOWTO",
"- essentially behaves like Texture2D, *except* that:",
"- tex coords must be non-normalized (0..pixel) instead of (0..1)",
"- tex coords must be non-normalized (0..pixel) instead of (0..1),\nalternatively you can use osg::TexMat to scale normal non dimensional texcoords.",
"- wrap modes must be CLAMP, CLAMP_TO_EDGE, or CLAMP_TO_BORDER\n repeating wrap modes are not supported",
"- filter modes must be NEAREST or LINEAR since\n mipmaps are not supported",
"- texture borders are not supported",