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[allforum]

Hello,

I don't understand what happens with ATI cards (no pb with nvidia).

I have a simple vertex shader. I created a function in this shader.

If I call the function some views are not drawn (I have one 2D (ortho) view and n perspective views).

If I copy/paste the code of the function in the main then all works well.

I also note this :

- if I disable antialiasing and I use the classical PIXELFORMATDESCRIPTOR then I have no more the problem.

- If I enable the GL_*_SMOOTH and I use the classical PIXELFORMATDESCRIPTOR then I have  the problem.

- if I enable or disable GL_MULTISAMPLE_ARB  and I use wglChoosePixelFormatARB then I have  the problem.

I join the code of the vertex shader. You can also find the code in this post : http://www.opengl.org/discussion_boards/showthread.php/181280-GLSL-shader-2-funny-things-on-ATI-card...

I join the pixel formats.

I tested on an X1300/X1550, HD 5450, FirePro V3750 and FirePro V4800.

Do you have an idea of what can cause this problem ?

Thanks

[allforum]

I have posted another question : "Invalid depth buffer on ATI X1300/X1550"

It is strange : in this case too when I disable antialiasing I have no more problem...

http://devgurus.amd.com/message/1288256#1288256

[allforum]

I tested with the condition always false :

if (bIsTexture != 0) // always false

   glTexCoord = glTexGen(0, TexGenMode, v);

So the function is not called. And I have the problem !

So it seems a problem with the generated code.

I have found a workaround for a HD5450 card. (a case in which the compiler/driver works...)

But it does not work on FirePro V3750.

So I will not use functions and put all the code in the main().

It seems impossible to target ATI cards : drivers or compilers are too unstable.

[allforum]

Same problem with Firepro V4800.

And still no answer from AMD people...

[allforum]

The problem of views not drawn when there is a function call in my vertex shader is solved on the last driver for Firepro V4800 (driver 9.3.3.3000).

There is still a problem : a crash when I draw dashed lines (with glLineStipple in display lists).

If I use my workaround (copy/paste of the code of the function in the main) then there is no crash !

So there is still a problem with the last driver on Firepro V4800.

There are problems on Firepro V3750 and there is no update since 23/05/2012 !!

And still no answer from AMD people to give explanations or workarounds...