Forums - Issue with constant indexing in fragment shader

Here is a snippet demonstrating the issue


    for( int i = 0; i < MAX_DIRECTIONAL_LIGHTS; i++ )
    {
      lv.lightVec     = fragIn.directionLightsDir[i].xyz;
      lv.lightColor   = directionalLights[i].attrib1.rgb;
      
      lv.attenuation  = 1.0;
    
      ApplyBRDF( lv, diffuseAccum, specularAccum );
      
      diffuseContrib+=diffuseAccum;
      specularContrib+=specularAccum;
    }

MAX_DIRECTIONAL_LIGHTS is defined in the global scope as const int MAX_DIRECTIONAL_LIGHTS = 2;

The accumulated value returns garbage with the loop, however if I remove the loop ( just repeat the loop body twice ), the result is correct. Again tested on a Mali GPU and with desktop GL and the loop works fine.  Any clue ?