[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

GL_BGRA+GL_UNSIGNED_INT_8_8_8_8_REV != GL_RGBA+GL_UNSIGNED_BYTE

Subject: GL_BGRA+GL_UNSIGNED_INT_8_8_8_8_REV != GL_RGBA+GL_UNSIGNED_BYTE
From: Jocelyn Houle <email@hidden>
Date: Thu, 29 Nov 2007 02:18:30 -0500
Delivered-to: email@hidden
Delivered-to: email@hidden

A little while ago, I stumbled upon this thread:
  http://lists.apple.com/archives/Mac-opengl/2007/Jul/msg00015.html

which reported that the Mac OpenGL Programming Guide:

http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_performance/chapter_13_section_2.html#/ /apple_ref/doc/uid/TP40001987-CH213-SW23

suggested using:
  GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV

instead of:
  GL_RGBA, GL_UNSIGNED_BYTE

to avoid needless swizzling on many cards.


I made that modification, and things seemed to work fine in Tiger.

But I recently noticed that I am having issues with such textures in Leopard (MBP w/x1600), and switching to GL_RGBA & GL_UNSIGNED_BYTE seems to fix it for me.

Should the two pairs of enums give exactly the same result (which would indicate a bug in Leopard, or at least, a difference in behavior)?

Do I need to combine these with a separate bit-setting somewhere? (I read something related to GL_UNPACK_CLIENT_STORAGE_APPLE, but I'm not sure I understand exactly if/how it plays into this, yet)


Any help appreciated...
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Mac-opengl mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/mac-opengl/email@hidden

This email sent to email@hidden

Follow-Ups:
- Re: GL_BGRA+GL_UNSIGNED_INT_8_8_8_8_REV != GL_RGBA+GL_UNSIGNED_BYTE
  - From: Daniel Koch <email@hidden>

Prev by Date: Re: FBO+GLSL write to texture with less than 4 components
Next by Date: Re: FBO+GLSL write to texture with less than 4 components
Previous by thread: Re: FBO+GLSL write to texture with less than 4 components
Next by thread: Re: GL_BGRA+GL_UNSIGNED_INT_8_8_8_8_REV != GL_RGBA+GL_UNSIGNED_BYTE
Index(es):
- Date
- Thread

Home