View Full Version : ATI Shader Compilation

12-03-2008, 01:41 PM
Hi All,

Im using ATI Radeon 4870.

I have written a shader (GLSL) which looks something like this

void main()
float wi[5] = float[5]( 0.01 , 0.02 , 0.03 , 0.04 , 0.05 );
int i;
int j;
for( i = -2; i <= 2; i++ )
for( j = -2; j <= 2; j++ )
weight = w[i+2] * w[j+2];


gl_FragData[ 0 ] = vec3( 1, 0 , 0 1 );

when the above shader is compiled on ATI graphics card I am getting the following error

Not supported when use temporary array indirect index.
Not supported when use temporary array indirect index.

for the line --> weight = w[i+2] * w[j+2];

The same line compiles fine on nVidia Card for opengl and d3d9 but on ATI, the d3d9 is fine but not the opengl.

your help is very much appreciated.



12-03-2008, 02:13 PM
Try with laster ATI driver version. What is your current version by the way ?

12-03-2008, 02:39 PM
Driver Packaging Version 8.552-081028a-070229C-ATI
Catalyst® Version 08.11
Provider ATI Technologies Inc.
2D Driver Version
2D Driver File Path /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/Class/{4D36E968-E325-11CE-BFC1-08002BE10318}/0000
Direct3D Version
OpenGL Version
Catalyst® Control Center Version 2008.1028.2134.36851

12-03-2008, 02:41 PM
I believe I am using the latest, I downloaded all the lastest package from ATI yesterday

12-03-2008, 03:11 PM
As far as I know, in glsl 1.2 you have to use direct array indexing (ie, put a constant value as array index). Sometimes use a variable as an array index would compile if the compiler can unroll the loop, otherwise it won't.
I don't know if in glsl 1.3 it is still the case and of your card support it.
On nvidia cards, this works because the compiler choose a special profile that allows indirect indexing.