View Full Version : Inter 945GM and Occlusion Query

03-10-2011, 06:17 PM
Hello Forum,

I need a firm answer on this please. I am unable to run occlusion query (project file with exe on this link http://www.codesampler.com/oglsrc/oglsrc_7.htm http://www.codesampler.com/source/ogl_occlusion_query_arb.zip).

I am using Intel 945GM Express chipset graphics card with maximum supported OpenGL version 1.4. Is this because of the hardware or OpenGL version which may prevents running occlusion query extension or am I missing something else?

Thanks in advance


Simon Arbon
03-10-2011, 07:10 PM
The Intel 945GM is a very low-level GPU and does not support occlusion queries.

03-10-2011, 10:10 PM
This is a hardware limitation.

The Mac driver for i945 supports a bunch of GL1.5/2.0/2.1/3.0 features like shadow funcs, GLSL, sRGB, PBO, FBO, etc. But it can still only claim GL1.4, because occlusion query is not supported.

03-11-2011, 07:44 AM
Thank you Simon and Arekkusu for your answers :) I was looking to get the pixel count with occlusion query, think I have no choice but to use glReadPixel()