Hi, I'm refering to the example of this article about streaming textures and using Pixel Buffer Objects: http://www.songho.ca/opengl/gl_pbo.html The PBO Unpack example (http://www.songho.ca/opengl/files/pboUnpack.zip) is creating an "animated texture" and can switch between three modes: Direct transfering of the texture using glTexSubImage2D, and using one or two PBOs for better performance. I'm running this example on an notebook with an Intel Core i7-2630QM and an Nvidia Geforce GT 550M with Optimus. If I'm using the Nvidia card using optirun I get the expected high performance, using direct tranfer about 150 fps and using PBOs about 400 fps. But if I'm using the intel card I get really slow rates, about 40 fps in direct mode and even worse about 10 fps using PBOs. Running the same example with windows I get about 100 fps using the intel card in every mode. Is this expected behaviour or is this a bug in the intel linux driver? How can I improve the performance? I hope you can help me here as I'm writing a real application using a video as texture. Regards, Marcel Witte
