segfault on compile...

[jimmycox]

Compiling this fragment shader is giving me a segfault on the ATI card I have (hd3400 mobility)...

I have a lot of troubles figuring out what's going.
I know that ATI is stricter than NVidia on syntax, but still...

Is there something obvious I missed??...

// Fragment shader
 
// the texture data
uniform sampler2D dataTexture;
 
// the color map texture
uniform sampler1D colorLut;
 
// texture pixel size...
uniform vec2 pixelSize;
 
// nearest or bi-linear?
uniform int switch_interp;
 
//prototype
vec4 texture2D_bilinear (sampler2D, vec2, vec2, sampler1D);    
 
//
void main(void)
{
    // position dans la data texture
    vec2 uv = gl_TexCoord[0].xy;
 
    // look up in the data texture
    vec4 lkup;
 
    vec4 couleur;
 
    if (switch_interp == 0){
 
        lkup = texture2D_bilinear(dataTexture, uv, pixelSize, colorLut);
        couleur = lkup;
    }
    else*
    {
	float intensity;
        intensity = texture2D(dataTexture, uv).a;
 
	couleur = texture1D(colorLut, intensity);
 
    }
 
    gl_FragColor = couleur;
}
 
vec4 texture2D_bilinear(sampler2D texture, vec2 uv, vec2 pixel, sampler1D lut)
{
   /* vec2 texel = uv/pixel;
    vec2 f = fract(uv/pixel);
 
    vec4 toto = texture2D(texture, uv);
 
    vec4 tl =  texture1D(lut, toto.a);
 
    toto = texture2D(texture, uv+vec2(1,0)*pixel);
 
    vec4 tr =  texture1D(lut, toto.a);
 
    toto = texture2D(texture, uv+vec2(0,1)*pixel);
    vec4 bl =  texture1D(lut, toto.a);
 
    toto = texture2D(texture, uv+vec2(1,1)*pixel);
    vec4 br =  texture1D(lut, toto.a);
 
    vec4 sum1 = mix(tl,tr,f.x); 
    vec4 sum2 = mix(bl,br,f.x);
    */
    //return mix(sum1, sum2, f.y);
    return vec4(1.0, 0.0, 0.0, 1.0);
}

[kyle_]

Compiling ... shader ... segfault

Is there something obvious I missed??...

This is always driver bug.

You could try to simplify the shader to workaround this. Id try removing the 'if' and/or sampler parameter (ie, use global) first ...

[jimmycox]

Yes, I had to remove the if/else to have it worked...
separate the one shader into 2 programs...

It will do for now, I guess, but it is not reassuring...

[frank li]

This shader works for me. Which driver do you use?