# glCompressedTexImage2D problems **URL:** \ **Category:** PowerVR Insider\ **Created:** [September 29, 2008, 10:36am UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156 "2008-09-29T10:36:37Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![jirzynek](https://avatars.discourse-cdn.com/v4/letter/j/a3d4f5/32.png) [@jirzynek](https://forums.imgtec.com/u/jirzynek)\ **Post date:** [September 29, 2008, 10:36am UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/1 "2008-09-29T10:36:37Z")
Hi! I've some problems with glCompressedTexImage2D function: when creating 16x16 texture with 8Bit palette **glCompressedTexImage2D(GL\_TEXTURE\_2D,0,GL\_PALETTE8\_R5\_G6\_B5\_OES,16,16,0,256 \* 2 + 16 \* 16,m);** everything is ok, but when I use 16x 16 image with 4bit palette **glCompressedTexImage2D(GL\_TEXTURE\_2D,0,GL\_PALETTE4\_R5\_G6\_B5\_OES,16,16,0,16 \* 2 + 16 \* 16, m);** where: **u8\* m = (u8 \*)malloc(64 \* 64 \* 4);** **data\_size = 2^PaletteBits \* sizeof(u16) + width \* height;** I've got GL error  GL\_INVALID\_VALUE (0x0501). Second: Why this code produces error when glTexSubImage2D() is invoked   u8\* m = (u8 \*)allocCustomHeap(128 \* 128 \* 4);   GLuint tex1, tex2, tex3;  GLint glerr;     glGenTextures(1, &tex1);   glBindTexture(GL\_TEXTURE\_2D, tex1);   glTexImage2D(GL\_TEXTURE\_2D, 0,  GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m);   glerr = glGetError();   glBindTexture(GL\_TEXTURE\_2D, tex1);   glTexSubImage2D(GL\_TEXTURE\_2D, 0, 0, 0, 10, 14, GL\_RGB, GL\_UNSIGNED\_BYTE, m);   glerr = glGetError(); **  glGenTextures(1, &tex2);   glBindTexture(GL\_TEXTURE\_2D, tex2);   glTexImage2D(GL\_TEXTURE\_2D, 0,  GL\_RGB, 32, 32, 0, GL\_RGB,  GL\_UNSIGNED\_SHORT\_5\_6\_5, m);   glerr = glGetError();** **  glBindTexture(GL\_TEXTURE\_2D, tex1);   glTexSubImage2D(GL\_TEXTURE\_2D, 0, 0, 0, 10, 14, GL\_RGB, GL\_UNSIGNED\_BYTE, m);   glerr = glGetError();**   glGenTextures(1, &tex3);   glBindTexture(GL\_TEXTURE\_2D, tex3);   glTexImage2D(GL\_TEXTURE\_2D, 0,  GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m);   glerr = glGetError();   glBindTexture(GL\_TEXTURE\_2D, tex1);   glTexSubImage2D(GL\_TEXTURE\_2D, 0, 0, 0, 10, 14, GL\_RGB, GL\_UNSIGNED\_BYTE, m);   glerr = glGetError(); but when all textures has same type (GL\_RGB and GL\_UNSINGED\_BYTE) everything is ok SDK bug?? please help, what Am I doing wrong? regards jirzynek jirzynek2008-09-29 14:04:15 ---
**Author:** ![xmas](https://avatars.discourse-cdn.com/v4/letter/x/958977/32.png) [@xmas](https://forums.imgtec.com/u/xmas)\ **Post date:** [September 30, 2008, 8:16am UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/2 "2008-09-30T08:16:52Z")
jirzynek wrote: Code: glCompressedTexImage2D(GL\_TEXTURE\_2D,0,GL\_PALETTE4\_R5\_G6\_B5\_OES,16,16,0,16 \* 2 + 16 \* 16, m); The size should be (16 \* 2) + (16 \* 16 **/ 2** ) since you only use 4 bits per pixel not 8. What error do you get in the second case? Regards, Georg ---
**Author:** ![jirzynek](https://avatars.discourse-cdn.com/v4/letter/j/a3d4f5/32.png) [@jirzynek](https://forums.imgtec.com/u/jirzynek)\ **Post date:** [September 30, 2008, 4:13pm UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/3 "2008-09-30T16:13:56Z")
I've got INVALID\_ENUM. check this code: **first case: no error** u8\* m = (u8 \*)allocCustomHeap(128 \* 128 \* 4); GLuint tex1, tex2, tex3; GLint glerr; glGenTextures(1, &tex1); glBindTexture(GL\_TEXTURE\_2D, tex1); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); // NO ERROR!!! glBindTexture(GL\_TEXTURE\_2D, tex1); glTexSubImage2D(GL\_TEXTURE\_2D, 0, 0, 0, 10, 14, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); glGenTextures(1, &tex2); glBindTexture(GL\_TEXTURE\_2D, tex2); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_SHORT\_5\_6\_5, m); glerr = glGetError(); glGenTextures(1, &tex3); glBindTexture(GL\_TEXTURE\_2D, tex3); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); **second case: error, I've only moved first glTexSubImage2D after glTexImage2D for second texture.** u8\* m = (u8 \*)allocCustomHeap(128 \* 128 \* 4); GLuint tex1, tex2, tex3; GLint glerr; glGenTextures(1, &tex1); glBindTexture(GL\_TEXTURE\_2D, tex1); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); glGenTextures(1, &tex2); glBindTexture(GL\_TEXTURE\_2D, tex2); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_SHORT\_5\_6\_5, m); glerr = glGetError(); // ERROR!!! glBindTexture(GL\_TEXTURE\_2D, tex1); glTexSubImage2D(GL\_TEXTURE\_2D, 0, 0, 0, 10, 14, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); glGenTextures(1, &tex3); glBindTexture(GL\_TEXTURE\_2D, tex3); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); **3rd case (NO ERROR): All textures has same type (GL\_UNSINGED\_BYTE****):** u8\* m = (u8 \*)allocCustomHeap(128 \* 128 \* 4); GLuint tex1, tex2, tex3; GLint glerr; glGenTextures(1, &tex1); glBindTexture(GL\_TEXTURE\_2D, tex1); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); glGenTextures(1, &tex2); glBindTexture(GL\_TEXTURE\_2D, tex2); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); // NO ERROR!!! glBindTexture(GL\_TEXTURE\_2D, tex1); glTexSubImage2D(GL\_TEXTURE\_2D, 0, 0, 0, 10, 14, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); glGenTextures(1, &tex3); glBindTexture(GL\_TEXTURE\_2D, tex3); glTexImage2D(GL\_TEXTURE\_2D, 0, GL\_RGB, 32, 32, 0, GL\_RGB, GL\_UNSIGNED\_BYTE, m); glerr = glGetError(); I think that glTexSubImage2D is using texture parameters not from currently bound texture but from previously created texture. Right now I'm using PC Emulation. cheers j. jirzynek2008-09-30 18:16:17 ---
**Author:** ![xmas](https://avatars.discourse-cdn.com/v4/letter/x/958977/32.png) [@xmas](https://forums.imgtec.com/u/xmas)\ **Post date:** [October 1, 2008, 1:49pm UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/4 "2008-10-01T13:49:28Z")
We’ll have a closer look at this. By the way, have you tried it with our latest SDK (2.3)? Regards, Georg ---
**Author:** ![jirzynek](https://avatars.discourse-cdn.com/v4/letter/j/a3d4f5/32.png) [@jirzynek](https://forums.imgtec.com/u/jirzynek)\ **Post date:** [October 1, 2008, 2:09pm UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/5 "2008-10-01T14:09:55Z")
Xmas wrote: We'll have a closer look at this. By the way, have you tried it with our latest SDK (2.3)? Yes, problem still exists... cheers j. ---
**Author:** ![GordonMaclachlan](https://avatars.discourse-cdn.com/v4/letter/g/c68b51/32.png) [@GordonMaclachlan](https://forums.imgtec.com/u/GordonMaclachlan)\ **Post date:** [April 2, 2009, 8:32am UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/6 "2009-04-02T08:32:25Z")
This issue should get looked at soon - apologies for the long delay.Gordon2009-04-02 10:37:12 ---
**Author:** ![GordonMaclachlan](https://avatars.discourse-cdn.com/v4/letter/g/c68b51/32.png) [@GordonMaclachlan](https://forums.imgtec.com/u/GordonMaclachlan)\ **Post date:** [May 8, 2009, 1:45pm UTC](https://forums.imgtec.com/t/glcompressedteximage2d-problems/156/7 "2009-05-08T13:45:01Z")
This issue has been fixed for our next release, due this summer.