Hi all!
In my OSG application I need to continuously update small parts of 2D
texture. So I use osg::Texture2D::SubloadCallback:
class MyCallback :
public osg::Texture2D::SubloadCallback
{
/* initialize texture */
void load(const Texture2D& texture,State& state) const
{
/* get pixel buffer object extension functions */
osg::PixelBufferObject::Extensions* ext =
osg::PixelBufferObject::getExtensions(state.getContextID(), true);
/* generate and cache PBO ID */
ext->glGenBuffers(1, &m_pbo);
if(m_pbo)
{
/* bind buffer */
ext->glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, m_pbo);
/* load texture initial data */
/* unbind buffer */
ext->glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
}
}
void subload(const osg::Texture2D& tex, osg::State& state) const
{
/* bind buffer */
ext->glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, m_pbo);
/* update some small part of the texture */
/* unbind buffer */
ext->glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
}
private:
GLuint m_pbo;
};
And everything works fine until the cleanup stage. In the code above
I've allocated a Pixel Buffer Object. Where should I place it's
deletion function (something like ext->glDeleteBuffers(1, &m_pbo))? Or
I should generate/delete it on every subload call with performance
penalty?
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