PowerVR Insider Forums http://www.imgtec.com/forum/ This is an XML content feed of; PowerVR Insider Forums : Last 10 Posts Copyright (c) 2006-2012 Web Wiz Forums - All Rights Reserved. Sat, 19 May 2012 18:47:20 +0000 Sat, 19 May 2012 07:11:37 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 10.11 30 www.imgtec.com/forum/RSS_topic_feed.asp PowerVR Insider Forums http://www.imgtec.com/forum/forum_images/web_wiz_forums.png http://www.imgtec.com/forum/ OpenVG Forum : Outstanding Handbags Give You Admirable Charisma http://www.imgtec.com/forum/forum_posts.asp?TID=2194&PID=6679&title=outstanding-handbags-give-you-admirable-charisma#6679 Author: xuwatches
Subject: Outstanding Handbags Give You Admirable Charisma
Posted: 19 May 12 at 7:11am



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Subject: Urban Ladys Essential Branded Handbags
Posted: 19 May 12 at 7:08am



Over the century, Givenchy Replica handbags have been an important part of a woman's life. Mulberry Replica handbags are known for their pure luxury and exquisite craftmanship. It is a popular saying that if you want to impress your lady love present her with Chloe Replica handbags. Some of the popular styles of Replica Handbags are the combination of superior quality and functionality.]]> Sat, 19 May 2012 07:08:31 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2193&PID=6678&title=urban-ladys-essential-branded-handbags#6678 OpenGL ES 2.0 Forum : Strange texture coordinates artefacts (iPads) http://www.imgtec.com/forum/forum_posts.asp?TID=2190&PID=6677&title=strange-texture-coordinates-artefacts-ipads#6677 Author: Joe
Subject: Strange texture coordinates artefacts (iPads)
Posted: 18 May 12 at 5:18pm

Hi,

Do you see the problem if you set color as:
lowp vec3 color = (color0) * lightMask.rgb;
?

Can you explain what the purpose of the mask is? Would it be possible to bake everything into a single texture instead?

Thanks,
Joe
]]> Fri, 18 May 2012 17:18:08 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2190&PID=6677&title=strange-texture-coordinates-artefacts-ipads#6677 PowerVR SDKs Forum : pvrtc_decompress returns RGBA http://www.imgtec.com/forum/forum_posts.asp?TID=2192&PID=6676&title=pvrtc-decompress-returns-rgba#6676 Author: Tobias
Subject: pvrtc_decompress returns RGBA
Posted: 18 May 12 at 12:15pm

Hi Biga,

Whilst internally the compress function actually uses RGBA, I believe in the past it used ARGB and when we changed it we had various users requesting we continue using ARGB, so we changed it back. There's never been such a request on the decompressor however, hence the disparity.

Unfortunately this is likely to remain the case now as we're deprecating this library and will only provide bug fixes for the next release.

Thanks,

Tobias


]]> Fri, 18 May 2012 12:15:31 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2192&PID=6676&title=pvrtc-decompress-returns-rgba#6676 PowerVR SDKs Forum : pvrtc_decompress returns RGBA http://www.imgtec.com/forum/forum_posts.asp?TID=2192&PID=6675&title=pvrtc-decompress-returns-rgba#6675 Author: Biga
Subject: pvrtc_decompress returns RGBA
Posted: 18 May 12 at 11:09am

I've downloaded PVRTC_REL_2.10@874981.tar.gz and used Linux_x86_32 version of libPVRTC.a library.
It appeared that pvrtc_decompress function produces RGBA image, which is strange, because the description in pvrtc.h states it should produce ARGB data. It also sorts ill with the pvrtc_compress function, which consumes ARGB data (not RGBA) and works well.


Edited by Biga - Yesterday at 11:10am]]> Fri, 18 May 2012 11:09:49 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2192&PID=6675&title=pvrtc-decompress-returns-rgba#6675 PowerVR Insider Forum : Test http://www.imgtec.com/forum/forum_posts.asp?TID=2191&PID=6674&title=test#6674 Author: chris
Subject: Test
Posted: 18 May 12 at 10:26am

Test reply.]]> Fri, 18 May 2012 10:26:31 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2191&PID=6674&title=test#6674 PowerVR Insider Forum : Test http://www.imgtec.com/forum/forum_posts.asp?TID=2191&PID=6673&title=test#6673 Author: BobGardner
Subject: Test
Posted: 18 May 12 at 10:24am

Test]]> Fri, 18 May 2012 10:24:24 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2191&PID=6673&title=test#6673 OpenGL ES 2.0 Forum : Strange texture coordinates artefacts (iPads) http://www.imgtec.com/forum/forum_posts.asp?TID=2190&PID=6672&title=strange-texture-coordinates-artefacts-ipads#6672 Author: boroda
Subject: Strange texture coordinates artefacts (iPads)
Posted: 15 May 12 at 5:22pm

Hello everyone,

We developing game, with vast landscapes. Landscape size is about 1km x 1km. 
The problem we've mentioned recently that we have HUGE artefacts on landscape. It's looking very strange, and I've never seen such artefacts before. Engine is cross-platform, and on PC and Mac everything looks good.

Geometry is landscape.
Coordinates from -330 to 330.
Texture coordinates: from 0 to 1

Issue is the following: 
The closer we move to (1, 1) texture coordinates, the more distortion we have during texture_fetch. You can see the effect on the images. 

http://dl.dropbox.com/u/3262472/Landscape-Artefacts/Corner_0_0_Normal.PNG
http://dl.dropbox.com/u/3262472/Landscape-Artefacts/Corner_1_1_Distorted.PNG
http://dl.dropbox.com/u/3262472/Landscape-Artefacts/Corner_0_0_Single_Texture_Nearest.PNG
http://dl.dropbox.com/u/3262472/Landscape-Artefacts/Corner_1_1_Single_Texture_Nearest_Distorted.PNG

1) Corner_0_0_Normal.PNG - Image in the corner of the map with texture coords (0, 0) - everything looks good (as it supposed). 
2) Corner_1_1_Distorted.PNG - Image of the opposite corner of the map with texture coords (1, 1) - image looks very distorted. 
These images: I replaced our shader with simple texture and enabled NEAREST filter. 
Results are very strange: 
3) Corner_0_0_Single_Texture_Nearest -  Image in the corner of the map with texture coords (0, 0) - everything looks good (as it supposed). 
4) Corner_1_1_Single_Texture_Nearest_Distorted - Image in the corner of the map with texture coords (1, 1) - everything looks very bad. 
Seems about 20% artefact during fetch in texture coordinates. 
Shaders below. 

PS. 
Precision modifiers in shader do not help at all.  We've tried to use highp for everything and it doesn't help. 

Can anyone help me how to resolve this issue. If you saw such artefacts please write us. 

Fragment shader:
https://github.com/dava/dava.framework/blob/development/Tools/ResourceEditor/Data/Shaders/Landscape/tilemask.fsh
Vertex shader: 
https://github.com/dava/dava.framework/blob/development/Tools/ResourceEditor/Data/Shaders/Landscape/tilemask.vsh




]]> Tue, 15 May 2012 17:22:50 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2190&PID=6672&title=strange-texture-coordinates-artefacts-ipads#6672 OpenGL ES 2.0 Forum : Android kern panic drivers/gpu/pvr/sgx/sgxutils.c http://www.imgtec.com/forum/forum_posts.asp?TID=2188&PID=6670&title=android-kern-panic-drivers-gpu-pvr-sgx-sgxutilsc#6670 Author: ReubenS
Subject: Android kern panic drivers/gpu/pvr/sgx/sgxutils.c
Posted: 14 May 12 at 12:33pm

Hi,

Wondering if anyone suitably familiar with SGX540 driver internals could comment on this bug report?

http://code.google.com/p/android/issues/detail?id=24118#

In a nutshell the Samsung Galaxy Nexus is occasionally rebooting itself in response to a kernel panic caused by a null pointer in SGXCleanupRequest() in drivers/gpu/pvr/sgx/sgxutils.c. This issue has been observed in stock Android ROMs up to and including the current (as of writing) ROM, 4.0.4.

Thanks,


Reuben
]]> Mon, 14 May 2012 12:33:34 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2188&PID=6670&title=android-kern-panic-drivers-gpu-pvr-sgx-sgxutilsc#6670 OpenGL ES 2.0 Forum : Android NDK samples native activity blank screen!! http://www.imgtec.com/forum/forum_posts.asp?TID=2178&PID=6669&title=android-ndk-samples-native-activity-blank-screen#6669 Author: Scott
Subject: Android NDK samples native activity blank screen!!
Posted: 14 May 12 at 10:23am

Hi,
 
This isn't something we've seen. What version of Android is your device running? Also, when you mention samples, is this the SDK examples? If so, is it just a few or do all the PVRShell based examples show the same problem? What version of the SDK are you using?
 
Cheers,
 
Scott


Edited by Scott - 14 May 12 at 10:25am]]> Mon, 14 May 2012 10:23:44 +0000 http://www.imgtec.com/forum/forum_posts.asp?TID=2178&PID=6669&title=android-ndk-samples-native-activity-blank-screen#6669