Method initDataImageSourceWithPboImpl

src/cinder/gl/Texture.cpp:1309–1345

Called by initData( ImageSourceRef ) when the user has supplied an intermediate PBO via Format We map the PBO after resizing it if necessary, and then use that as a data store for the ImageTargetGlTexture

// Called by initData( ImageSourceRef ) when the user has supplied an intermediate PBO via Format
// We map the PBO after resizing it if necessary, and then use that as a data store for the ImageTargetGlTexture
void Texture2d::initDataImageSourceWithPboImpl( const ImageSourceRef &imageSource, const Format & /*format*/, GLint dataFormat, GLint dataType, ImageIo::ChannelOrder channelOrder, bool isGray, const PboRef &pbo )
{
	auto ctx = gl::context();

	ctx->pushBufferBinding( GL_PIXEL_UNPACK_BUFFER, pbo->getId() );
	// resize the PBO if necessary
	if( pbo->getSize() < imageSource->getRowBytes() * imageSource->getHeight() )
		pbo->bufferData( imageSource->getRowBytes() * imageSource->getHeight(), nullptr, GL_STREAM_DRAW );
	void *pboData = pbo->map( GL_WRITE_ONLY );

	if( imageSource->getDataType() == ImageIo::UINT8 ) {
		auto target = ImageTargetGlTexture<uint8_t>::create( this, channelOrder, isGray, imageSource->hasAlpha(), pboData );
		imageSource->load( target );
		pbo->unmap();
		glTexImage2D( mTarget, 0, mInternalFormat, mActualSize.x, mActualSize.y, 0, dataFormat, dataType, nullptr );
	}
	else if( imageSource->getDataType() == ImageIo::UINT16 ) {
		auto target = ImageTargetGlTexture<uint16_t>::create( this, channelOrder, isGray, imageSource->hasAlpha(), pboData );
		imageSource->load( target );
		pbo->unmap();
		glTexImage2D( mTarget, 0, mInternalFormat, mActualSize.x, mActualSize.y, 0, dataFormat, dataType, nullptr );
	}
	else if( imageSource->getDataType() == ImageIo::FLOAT16 ) {
		auto target = ImageTargetGlTexture<half_float>::create( this, channelOrder, isGray, imageSource->hasAlpha(), pboData );
		imageSource->load( target );
		pbo->unmap();
		glTexImage2D( mTarget, 0, mInternalFormat, mActualSize.x, mActualSize.y, 0, dataFormat, dataType, nullptr );
	}
	else {
		auto target = ImageTargetGlTexture<float>::create( this, channelOrder, isGray, imageSource->hasAlpha(), pboData );
		imageSource->load( target );
		pbo->unmap();
		glTexImage2D( mTarget, 0, mInternalFormat, mActualSize.x, mActualSize.y, 0, dataFormat, dataType, nullptr );
	}

	ctx->popBufferBinding( GL_PIXEL_UNPACK_BUFFER );
}
#endif

// Called by initData( ImageSourceRef ) when the user has NOT supplied an intermediate PBO