U++ forum: Welcome to the forum

Re: OpenGL texture issues [message #40719 is a reply to message #40716]

Sun, 08 September 2013 19:05

mirek
Messages: 14256
Registered: November 2005

Ultimate Member

unodgs wrote on Sun, 08 September 2013 06:26

mirek wrote on Sun, 08 September 2013 01:35

mirek wrote on Sun, 08 September 2013 01:30

- it looks to like OpenGL expects textures in non-premultiplies format. In that case we need to unmultiply Image, right? (I have not seen any such thing in CoreGL/resources.cpp, but I might be missing something).

Ha, 2 minutes after posting, I have found in CoreGL

	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

I have to admit I didn't even think about it Smile

But docs says it is exactly prempultiplied mode.

If it comes to textures of power of 2 it is true for opengl es - so for all mobile devices. On desktop it is not required.

Actually, OpenGL ES 2.0 says that non-power-of-2 textures are OK as well, just do not support mipmapping...

Mirek

Report message to a moderator