Poor sincos precision on Intel HD 5000

[GMenh]

Hello. We've bumped into an issue with sincos on the Intel HD 5000/5600 platforms (using DX11). There are certain values that cause sincos to return completely bogus values which manifest as screwed up geometry. Given that these functions are periodic, the displayed artifacts are quite visible to the user. The same shader code running on an nVidia or AMD card (including older cards) works as expected.

At the moment, we've resorted to using a hand-rolled implementation of sincos using a taylor series expansion. This is less than ideal for obvious reasons. Is this a known issue? Are there any workarounds?

Thanks much.

[idata]

Hello hgm4,

I understand you are trying to use Sincos application, but you are getting artifacts and screwed up geometry. Let me apologize for any inconvenience this issue may be causing to you. In order to help you better I would like to gather more information about the configuration you have in the computer. Please reply to this email attaching the .xml file the Intel® System Support Utility will generate https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility If possible please attach a screenshot showing the issue you are having. Let me also know the version of the software you are currently using. Regards,Fred

[idata]

Hello hgm4,

I was wondering if you still need assistance with the artifacts you are getting on the screen. In case you still need assistance just let me know. Regards,Fred

[GMenh]

Yes sir, I do. We've duplicated the problem on the following chipsets: HD 530, HD 5000, as well as the HD 5600. We are compiler our vertex shader using HLSL shader 5.0 with and without IEEE strictness flag (/Gis). Following is more detailed information from the machine with the HD 5600:

Processor: Intel(R) Core(TM) i7-5700HQ CPU @ 2.70GHz (8 CPUs), ~2.7GHz

Card name: Intel(R) HD Graphics 5600

Manufacturer: Intel Corporation

Chip type: Intel(R) HD Graphics Family

DAC type: Internal

Device Type: Full Device

Device Key: Enum\PCI\VEN_8086&DEV_1612&SUBSYS_B5561458&REV_0A

Display Memory: 8275 MB

Dedicated Memory: 128 MB

Shared Memory: 8147 MB

Current Mode: 3840 x 2160 (32 bit) (59Hz)

Monitor Name: BenQ BL2700

Monitor Model: BenQ LCD

Monitor Id: BNQ8018

Native Mode: 3840 x 2160(p) (59.997Hz)

Output Type: Displayport External

Driver Name: igdumdim64.dll,igd10iumd64.dll,igd10iumd64.dll,igd12umd64.dll,igdumdim32,igd10iumd32,igd10iumd32,igd12umd32

Driver File Version: 20.19.0015.4501 (English)

Driver Version: 20.19.15.4501

DDI Version: 12

Feature Levels: 11.1,11.0,10.1,10.0,9.3,9.2,9.1

Driver Model: WDDM 2.0

Graphics Preemption: Triangle

Compute Preemption: Thread group

Miracast: Supported

Hybrid Graphics GPU: Integrated

Power P-states: Not Supported

Driver Attributes: Final Retail

Driver Date/Size: 9/1/2016 17:00:26, 39863880 bytes

WHQL Logo'd: n/a

WHQL Date Stamp: n/a

Device Identifier: {D7B78E66-5552-11CF-7D66-5995B6C2D935}

Vendor ID: 0x8086

Device ID: 0x1612

SubSys ID: 0xB5561458

Revision ID: 0x000A

Driver Strong Name: oem0.inf:5f63e53472aaf42d:iBDWM_w10:20.19.15.4501:pci\ven_8086&dev_1612

Rank Of Driver: 00D12001

Video Accel: ModeMPEG2_A ModeMPEG2_C ModeWMV9_C ModeVC1_C

DXVA2 Modes: DXVA2_ModeMPEG2_VLD DXVA2_ModeMPEG2_IDCT DXVA2_ModeVC1_D2010 DXVA2_ModeWMV9_IDCT DXVA2_ModeVC1_IDCT DXVA2_ModeH264_VLD_NoFGT DXVA2_ModeH264_VLD_Stereo_Progressive_NoFGT DXVA2_ModeH264_VLD_Stereo_NoFGT DXVA2_ModeH264_VLD_Multiview_NoFGT DXVA2_ModeHEVC_VLD_Main DXVA2_ModeHEVC_VLD_Main10

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{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YV12,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY VideoProcess_AlphaBlend

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D3D9 Overlay: Supported

DXVA-HD: Supported

DDraw Status: Enabled

D3D Status: Enabled

AGP S...

[idata]

Hello hgm4,

Thanks for the information you sent to me. I would like you to try installing latest graphics driver we have available on our website. please download it from this link https://downloadmirror.intel.com/26682/eng/win64_154034.4624.zip https://downloadmirror.intel.com/26682/eng/win64_154034.4624.zip Please install the driver with the steps that are on this YouTube video https://www.youtube.com/watch?v=S1KzoQDjMMY https://www.youtube.com/watch?v=S1KzoQDjMMY The content on the above site is not controlled by Intel. This information is offered for your convenience and should not be viewed as an endorsement by Intel for the merchants or services offered there. Let me know if issue persists or not with the graphics driver I provided. Regards,Fred

[GMenh]

Fred,

We installed the latest drivers you provided to us. We re-ran the application and still see the issue with sincos in the vertex shader. Any other ideas?

Thanks.

[idata]

Hello hgm4,

I am sorry to hear issue persists even with latest graphics driver. I would like you to try older version of the graphics driver. Please download this other driver version https://downloadmirror.intel.com/25948/eng/win64_154022.4424.zip https://downloadmirror.intel.com/25948/eng/win64_154022.4424.zip As soon as the driver has been downloaded on the keyboard press WinLogo key + r, then type in devmgmt.msc, double click on Display Adapters>>Intel HD Graphics 5500>>Driver tab>>Uninstall>>Select the check box Delete the driver software for this device>>OK, restart the computer, and then reinstall the graphics driver with the steps that are on this YouTube video https://www.youtube.com/watch?v=S1KzoQDjMMY https://www.youtube.com/watch?v=S1KzoQDjMMY The content on the above site is not controlled by Intel. This information is offered for your convenience and should not be viewed as an endorsement by Intel for the merchants or services offered there. Let me know if issue persists or not. Regards,Fred

[idata]

Hello hgm4,

I was wondering if you were able to try the other driver version I provided. In case you need further assistance just let me know. Regards,Fred

[GMenh]

Fred,

We have not yet had a chance to try the older driver. We'll have some additional for you early next week. Thanks for all your help.

[idata]

Hello hgm4,

Test the driver at your convenience, and let me know the outcome. Regards,Fred

[idata]

Hello hgm4,

Were you able to test the driver I provided? In case you need further assistance just let me know. Regards,Fred

[GMenh]

Fred,

Sorry for the delay. Just tested the older driver you provided. We are still seeing issues with sin/cos in the vertex shader (no change).

[idata]

Hello hgm4,

I would like to gather more information about the issue you are experiencing. Please fill out the form that in the following link and post it on this thread /thread/77761 https://communities.intel.com/thread/77761 Please provide detailed steps to reproduce the issue. Let me also know if there is any trial/free version of the software we can use to reproduce the issue. Regards,Fred

[idata]

Hello hgm4,

I was wondering if you still need assistance with the artifacts you are getting on the screen. In case you still need assistance just let me know. Regards,Fred