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jimmycox
08-20-2010, 05:11 AM
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_
08-21-2010, 01:25 PM
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
08-22-2010, 09:45 AM
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
08-22-2010, 07:27 PM
This shader works for me. Which driver do you use?