[Qt-interest] GLSL and two semi-transparent textures

[Josiah Bryan]

Samuel Rødal wrote:
> On 08/10/2010 11:16 PM, ext Josiah Bryan wrote:
>> I thought it might have something to do with depth testing, or the Z
>> value of the textures, so I set that up properly, enabled GL_DEPTH_TEST,
>>    set glDepthFunc, and added a Z component to the vertex buffers used in
>> the paint method starting on line 602 - that didn't help at all. Same
>> exact outcome.
>>
>> Any suggestions on what I'm doing wrong or how I can get the overlay to
>> blend with the texture behind it instead of the clear color?
> 
> I'd say try to make sure depth testing is completely disabled. If you 
> just want to paint two textures on top of each other you don't need it. 
> It might be that the z values from the last frame are left in the z 
> buffer causing the bottom texture to not be painted in that area.

That was it!! Sweet. Just changed the glEnable to:
glDisable(GL_DEPTH_TEST);

And removed the glClearDepth and related lines..and it works!

Thanks for your help - really appreciate it.

Thanks!
-Josiah