FGFS-4.1/OpenSceneGraph
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Added Texuture::SubloadCallback example into the osgprerender demo to illustrate

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how to use it.

Changed the ImpostorSprite to use LINEAR,LINEAR for min and mag filters for the
impostor texture.
This commit is contained in:
Robert Osfield
2002-08-16 15:14:43 +00:00
parent 7dfefaf67f
commit 2ab0f689eb
4 changed files with 145 additions and 38 deletions
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135
src/Demos/osgprerender/osgprerender.cpp
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@@ -23,7 +23,6 @@
#include <osgGLUT/glut>
#include <osgGLUT/Viewer>
class MyAppCallback : public osg::NodeCallback
{
public:
@@ -284,6 +283,119 @@ class MyGeometryCallback :
};
// Custom Texture subload callback, just acts the the standard subload modes in osg::Texture right now
// but code be used to define your own style callbacks.
class MyTextureSubloadCallback : public osg::Texture::SubloadCallback
{
public:
virtual void load(GLenum target, const osg::Texture& texture,osg::State&) const
{
osg::notify(osg::INFO)<<"doing load"<<std::endl;
static bool s_SGIS_GenMipmap = osg::isGLExtensionSupported("GL_SGIS_generate_mipmap");
if (s_SGIS_GenMipmap && (texture.getFilter(osg::Texture::MIN_FILTER) != osg::Texture::LINEAR && texture.getFilter(osg::Texture::MIN_FILTER) != osg::Texture::NEAREST))
{
texture.setNumMipmapLevels(1); // will leave this at one, since the mipmap will be created internally by OpenGL.
glTexParameteri(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
}
else
{
texture.setNumMipmapLevels(1);
}
int subloadImageOffsetX;
int subloadImageOffsetY;
texture.getSubloadImageOffset(subloadImageOffsetX,subloadImageOffsetY);
int subloadImageWidth;
int subloadImageHeight;
texture.getSubloadImageSize(subloadImageWidth,subloadImageHeight);
GLsizei width = (subloadImageWidth>0)?subloadImageWidth:texture.getImage()->s();
GLsizei height = (subloadImageHeight>0)?subloadImageHeight:texture.getImage()->t();
int subloadTextureOffsetX;
int subloadTextureOffsetY;
texture.getSubloadTextureOffset(subloadTextureOffsetX,subloadTextureOffsetY);
int textureWidth;
int textureHeight;
texture.getSubloadTextureSize(textureWidth, textureHeight);
bool sizeChanged = false;
if (textureWidth==0)
{
// need to calculate texture dimension
sizeChanged = true;
textureWidth = 1;
for (; textureWidth < (static_cast<GLsizei>(subloadTextureOffsetX) + width); textureWidth <<= 1) {}
}
if (textureHeight==0)
{
// need to calculate texture dimension
sizeChanged = true;
textureHeight = 1;
for (; textureHeight < (static_cast<GLsizei>(subloadTextureOffsetY) + height); textureHeight <<= 1) {}
}
if (sizeChanged)
{
texture.setSubloadTextureSize(textureWidth, textureHeight);
}
// reserve appropriate texture memory
glTexImage2D(target, 0, texture.getInternalFormatValue(),
textureWidth, textureHeight, 0,
(GLenum) texture.getImage()->getPixelFormat(), (GLenum) texture.getImage()->getDataType(),
NULL);
glPixelStorei(GL_UNPACK_ROW_LENGTH,texture.getImage()->s());
glTexSubImage2D(target, 0,
subloadTextureOffsetX, subloadTextureOffsetY,
width, height,
(GLenum) texture.getImage()->getPixelFormat(), (GLenum) texture.getImage()->getDataType(),
texture.getImage()->data(subloadImageOffsetX,subloadImageOffsetY));
glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
}
virtual void subload(GLenum target, const osg::Texture& texture,osg::State&) const
{
osg::notify(osg::INFO)<<"doing subload"<<std::endl;
glPixelStorei(GL_UNPACK_ROW_LENGTH,texture.getImage()->s());
int subloadTextureOffsetX;
int subloadTextureOffsetY;
texture.getSubloadTextureOffset(subloadTextureOffsetX,subloadTextureOffsetY);
int subloadImageOffsetX;
int subloadImageOffsetY;
texture.getSubloadImageOffset(subloadImageOffsetX,subloadImageOffsetY);
int subloadImageWidth;
int subloadImageHeight;
texture.getSubloadImageSize(subloadImageWidth,subloadImageHeight);
glTexSubImage2D(target, 0,
subloadTextureOffsetX, subloadTextureOffsetY,
(subloadImageWidth>0)?subloadImageWidth:texture.getImage()->s(), (subloadImageHeight>0)?subloadImageHeight:texture.getImage()->t(),
(GLenum) texture.getImage()->getPixelFormat(), (GLenum) texture.getImage()->getDataType(),
texture.getImage()->data(subloadImageOffsetX,subloadImageOffsetY));
glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
}
};
osg::Node* createPreRenderSubGraph(osg::Node* subgraph)
{
@@ -348,28 +460,13 @@ osg::Node* createPreRenderSubGraph(osg::Node* subgraph)
image->setInternalTextureFormat(GL_RGBA);
osg::Texture* texture = new osg::Texture;
texture->setSubloadMode(osg::Texture::IF_DIRTY);
//texture->setSubloadMode(osg::Texture::IF_DIRTY);
texture->setSubloadCallback(new MyTextureSubloadCallback());
texture->setImage(image);
texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
texture->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
// {
// // set up the second tex coord array for the an additional texture
// // to add texture to the flag.
// polyGeom->setTexCoordArray(1,texcoords);
//
// osg::Image* overlay_image = osgDB::readImageFile("tank.rgb");
// osg::Texture* overlay_texture = new osg::Texture;
// overlay_texture->setImage(overlay_image);
// stateset->setTextureAttributeAndModes(1, overlay_texture,osg::StateAttribute::ON);
//
// osg::TexEnv* overlay_texenv = new osg::TexEnv;
// overlay_texenv->setMode(osg::TexEnv::BLEND);
// overlay_texenv->setColor(osg::Vec4(0.3f,0.3f,0.3f,1.0f));
// stateset->setTextureAttribute(1, overlay_texenv);
// }
polyGeom->setStateSet(stateset);
polyGeom->setAppCallback(new MyGeometryCallback(origin,xAxis,yAxis,zAxis,1.0,1.0/width,0.2f));
@@ -381,10 +478,8 @@ osg::Node* createPreRenderSubGraph(osg::Node* subgraph)
parent->setAppCallback(new MyAppCallback(subgraph));
// parent->setCullCallback(new MyCullCallback(subgraph,texture));
parent->setCullCallback(new MyCullCallback(subgraph,image));
// parent->addChild(billboard);
parent->addChild(geode);
return parent;

2
src/osg/ImpostorSprite.cpp
View File

@@ -254,6 +254,8 @@ ImpostorSprite* ImpostorSpriteManager::createOrReuseImpostorSprite(int s,int t,i
stateset->setAttributeAndModes( _alphafunc.get(), StateAttribute::ON );
Texture* texture = osgNew Texture;
texture->setFilter(Texture::MIN_FILTER,Texture::LINEAR);
texture->setFilter(Texture::MAG_FILTER,Texture::LINEAR);
stateset->setTextureAttributeAndModes(0,texture,StateAttribute::ON);
stateset->setTextureAttribute(0,_texenv.get());