# sampler2DShadow supported ?

**URL:** <https://forums.imgtec.com/t/sampler2dshadow-supported/1976>\
**Category:** PowerVR Insider\
**Tags:** pvrshaman\
**Created:** [January 8, 2014, 12:16am UTC](https://forums.imgtec.com/t/sampler2dshadow-supported/1976 "2014-01-08T00:16:58Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![dgu](https://avatars.discourse-cdn.com/v4/letter/d/94ad74/32.png) [@dgu](https://forums.imgtec.com/u/dgu)\
**Post date:** [January 8, 2014, 12:16am UTC](https://forums.imgtec.com/t/sampler2dshadow-supported/1976/1 "2014-01-08T00:16:58Z")

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Dear team  
  
  
  
i am trying to port Blurring Hard-Edged Shadows shader ([http://http.developer.nvidia.com/GPUGems2/gpugems2\_chapter17.html](http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter17.html)).  
  
I tried to test sampler2DShadow in PVRSHAMAN as an experience but it fail probably using pfx is not the right approach as well ?  
  
do you know if it is supported and how to activate extension in PVRSHAMAN (GL\_EXT\_shadow\_samplers) by a declarative way ?  
  
the shadow volume demo is not very performant even with low poly objects and the drop in framerate is huge.  
  
  
  
any idea ?  
  
kind regards  
  
david

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**Author:** ![JoeDavis](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/joedavis/32/71_2.png) [@JoeDavis](https://forums.imgtec.com/u/JoeDavis)\
**Post date:** [January 8, 2014, 9:28am UTC](https://forums.imgtec.com/t/sampler2dshadow-supported/1976/2 "2014-01-08T09:28:40Z")

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Hi David,  
  
  
  
PVRShaman was designed to only support core graphics API functionality. I’ve filed BRN46455 for extension support to be added to the tool.  
  
For now, I would recommend using your games rendering engine to develop and test any extensions you need.  
  
  
  
I’ve filed BRN46456 for the performance of the ShadowVolume to be investigated.  
  
  
  
Regards,  
  
Joe

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**Author:** ![dgu](https://avatars.discourse-cdn.com/v4/letter/d/94ad74/32.png) [@dgu](https://forums.imgtec.com/u/dgu)\
**Post date:** [January 8, 2014, 1:26pm UTC](https://forums.imgtec.com/t/sampler2dshadow-supported/1976/3 "2014-01-08T13:26:05Z")

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thank you very Much Joe

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**Author:** ![dgu](https://avatars.discourse-cdn.com/v4/letter/d/94ad74/32.png) [@dgu](https://forums.imgtec.com/u/dgu)\
**Post date:** [January 8, 2014, 2:02pm UTC](https://forums.imgtec.com/t/sampler2dshadow-supported/1976/4 "2014-01-08T14:02:49Z")

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PLEASE MAY YOU remove BRN46456 the shadow volum is in fact super performant as i can see, i made a mistake and was making the wrong call at the wrong place ( i was sleepy i work the nite).  
  
  
  
many apologize about this !!! my engine is flying now and it s beautiful!!! woow !!!

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**Author:** ![JoeDavis](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/joedavis/32/71_2.png) [@JoeDavis](https://forums.imgtec.com/u/JoeDavis)\
**Post date:** [January 9, 2014, 9:53am UTC](https://forums.imgtec.com/t/sampler2dshadow-supported/1976/5 "2014-01-09T09:53:40Z")

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Hi David,  
  
  
  
Glad to hear you’ve resolved the shadow volume performance issues. I’ve closed BRN46456. Looking forward to seeing the game up and running 🙂  
  
  
  
Joe