[osg-users] Equivalent of glTexSubImage2D ?

[Johny Canes]

Hi,

For the lurker coming here for Awesomium, use the following code. The key is to use the unpack alignment settings.

Very non optimized and copied from https://github.com/assertfail/bezel-webkit/blob/master/Source/wkSurface.cpp

Code:
void nr::awe::Drawer::operator() (const osg::Camera& cam) const {

	OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mutex);

	if (paints.size()<1)
		return;

	//if ( ! gGc->getState() )
		//return;

	auto cid = gGc->getState()->getContextID();

	if ( NULL == awe::texture->getTextureObject( cid ) )
		return;

	auto obj = awe::texture->getTextureObject( cid );
	obj->bind();

	int bpp = 4;
	int stride = nr::width * 4;

	for ( auto p : paints )
	{
		glPixelStorei(GL_UNPACK_ROW_LENGTH, stride/bpp); 
		glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, p.dest_rect.height);
    
		glPixelStorei(GL_UNPACK_SKIP_PIXELS,  p.dest_rect.x);
		glPixelStorei(GL_UNPACK_SKIP_ROWS,    p.dest_rect.y);

		glTexSubImage2D(
			GL_TEXTURE_2D,
			0,
			p.dest_rect.x,
			p.dest_rect.y,
			p.dest_rect.width,
			p.dest_rect.height,
			GL_BGRA,
			GL_UNSIGNED_BYTE,
			p.src_buffer);

		//unsigned char* a = &p.src_buffer[0];

		//glTexSubImage2D(GL_TEXTURE_2D, 0, p.dest_rect.x, p.dest_rect.y, p.dest_rect.width, p.dest_rect.height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, a);

		glPixelStorei(GL_UNPACK_ROW_LENGTH,   0);
		glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, 0);
		glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
		glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);

		delete p.src_buffer;
	}

	paints.clear();

}

void nr::awe::Zurface::Paint(unsigned char* buffer, int ss, const Awesomium::Rect& sr, const Awesomium::Rect& dr) {

	int row;
	int bpp = 4;
	int stride = nr::width * 4;

	unsigned char* store = (unsigned char*) malloc(nr::height * stride);

    memset(store, 0, height * stride);

	// copy the region to our store
    for (row = 0 ; row < dr.height ; ++row)
        memcpy(store+(row+dr.y)*stride+(dr.x*bpp),
               buffer+(row+sr.y)*ss+(sr.x*4),
               dr.width*bpp);

	//memcpy(copy, src_buffer, src_row_span * src_rect.height);

	OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mutex);

	paints.push_back( {store, ss, sr, dr} );

};



Thank you!

Cheers,
Johny

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http://forum.openscenegraph.org/viewtopic.php?p=70405#70405