# OpenGL ES + Virtual PC : dept buffer issue

**URL:** <https://forums.imgtec.com/t/opengl-es-virtual-pc-dept-buffer-issue/122>\
**Category:** PowerVR Insider\
**Created:** [August 19, 2008, 7:58pm UTC](https://forums.imgtec.com/t/opengl-es-virtual-pc-dept-buffer-issue/122 "2008-08-19T19:58:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![emoysan](https://avatars.discourse-cdn.com/v4/letter/e/9fc29f/32.png) [@emoysan](https://forums.imgtec.com/u/emoysan)\
**Post date:** [August 19, 2008, 7:58pm UTC](https://forums.imgtec.com/t/opengl-es-virtual-pc-dept-buffer-issue/122/1 "2008-08-19T19:58:43Z")

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Hi  
  
i'm using the OpenGL ES 1.1 SDK on Linux (Debian) on top of VirtualPC (!)  
  
I have built MESA succcessfully (7.x) and I'm facing a problem with depth buffers.  
None of the sample run with a depth buffer and I get the MESA warning: GL\_DEPTH\_TEST enabled but no Z Buffer.  
  
However, glxinfo gives configurations with Z buffer of 16 bits.  
  
help.

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**Author:** ![ddd](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/ddd/32/19_2.png) [@ddd](https://forums.imgtec.com/u/ddd)\
**Post date:** [August 24, 2008, 3:41pm UTC](https://forums.imgtec.com/t/opengl-es-virtual-pc-dept-buffer-issue/122/2 "2008-08-24T15:41:58Z")

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I believe Virtual PC uses a generic VGA graphics driver… this may be the reason for your problems.   
  
It’s probably best to run the SDK under a native OS that can take advantage of the full hardware and does not require to run emulations on top of emulation layers. 2cts.