# PVRFRAME: glCopyTexImage2D issue **URL:** \ **Category:** PowerVR Insider\ **Tags:** pvrvframe\ **Created:** [May 6, 2011, 7:14am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069 "2011-05-06T07:14:43Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![joepix](https://avatars.discourse-cdn.com/v4/letter/j/ce73a5/32.png) [@joepix](https://forums.imgtec.com/u/joepix)\ **Post date:** [May 6, 2011, 7:14am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069/1 "2011-05-06T07:14:43Z")
Hello, I cant make glCopyTexImage2D working under pvrframe (build 2.08.28.0607, windows 7 x64, catalyst 11.4), I’m trying to copy pixels from a FBO and it always fails and returns error 501, the log is: "In glCopyTexImage2D error: 501 (GL\_INVALID\_VALUE) : (null)" I dont think the problem comes from my code as it is working with some other GLES wrappers:   /\* create buffer texture _/   glBindTexture( GL\_TEXTURE\_2D, tbuffer);   glTexParameteri( GL\_TEXTURE\_2D, GL\_TEXTURE\_WRAP\_S, GL\_CLAMP\_TO\_EDGE);   glTexParameteri( GL\_TEXTURE\_2D, GL\_TEXTURE\_WRAP\_T, GL\_CLAMP\_TO\_EDGE);   glTexParameteri( GL\_TEXTURE\_2D, GL\_TEXTURE\_MIN\_FILTER, GL\_LINEAR);   glTexParameteri( GL\_TEXTURE\_2D, GL\_TEXTURE\_MAG\_FILTER, GL\_LINEAR);   glTexImage2D( GL\_TEXTURE\_2D, 0, GL\_RGBA, w, h, 0, GL\_RGBA, GL\_UNSIGNED\_BYTE, NULL);   glBindTexture( GL\_TEXTURE\_2D, 0);_ _  /_ assign texture to fbo _/   glFramebufferTexture2D( GL\_FRAMEBUFFER, GL\_COLOR\_ATTACHMENT0,                           GL\_TEXTURE\_2D, tbuffer, 0);_ _/_ …rendering code… _/_ _  /_ copy result to another texture \*/   glBindTexture( GL\_TEXTURE\_2D, texture);   glCopyTexImage2D( GL\_TEXTURE\_2D, 0, GL\_ALPHA, 0, 0, w, h, 0); -\> error 501 Thanks in advance, joe ---
**Author:** ![aaron](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@aaron](https://forums.imgtec.com/u/aaron)\ **Post date:** [May 6, 2011, 7:21am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069/2 "2011-05-06T07:21:08Z")
Could you explain why you are copying the texture? Thanks, Aaron. ---
**Author:** ![joepix](https://avatars.discourse-cdn.com/v4/letter/j/ce73a5/32.png) [@joepix](https://forums.imgtec.com/u/joepix)\ **Post date:** [May 6, 2011, 7:39am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069/3 "2011-05-06T07:39:49Z")
I’m copying the texture because it’s not possible to directly render to a GL\_ALPHA texture using fbo (according to GL ES 2 specifications). I could use a RGBA texture, but I try to limit texture memory consumption. ---
**Author:** ![aaron](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@aaron](https://forums.imgtec.com/u/aaron)\ **Post date:** [May 6, 2011, 8:20am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069/4 "2011-05-06T08:20:23Z")
Ah, the old speed vs size trade-off. I’d suggest at least making the copy step a build option so you can test both (on a real device, PVRVFrame performance doesn’t reflect device performance), in case find you see a performance boost significant enough to outweigh the memory saving. The PVRVFrame error you reported will be investigated. ---
**Author:** ![jacekc](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@jacekc](https://forums.imgtec.com/u/jacekc)\ **Post date:** [May 6, 2011, 8:54am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069/5 "2011-05-06T08:54:07Z")
Is it possible that you send us (devtech@imgtec.com) narrowed example/complete code demonstraiting  that problem? Thanks ---
**Author:** ![joepix](https://avatars.discourse-cdn.com/v4/letter/j/ce73a5/32.png) [@joepix](https://forums.imgtec.com/u/joepix)\ **Post date:** [May 6, 2011, 9:04am UTC](https://forums.imgtec.com/t/pvrframe-glcopyteximage2d-issue/1069/6 "2011-05-06T09:04:26Z")
The code is actually part of a large project, I will try to reproduce the problem with a simple code that I could send you, just need to find some time.