# Function Question

• 10-07-2009, 03:21 AM
toneburst
Function Question
Hi,

this is probably a really stupid question, but I'm having problems with a simple function-call in an OpenCL Kernel.

Here's the code:
Code :

```const float PI = 3.14159265359; const float TWOPI = 6.28318530718;   float4 makeSphere(float4 pos, float radius) {   float u = pos.x * TWOPI; float v = pos.y * PI;   float4 sphere; sphere.x = radius * cos(u) * sin(v); sphere.y = radius * css(u) * sin(v); sphere.z = radius * cos(v); sphere.w = 1.0;   return sphere; }     __kernel void read_rgba8888(__rd image2d_t BaseImg, float Width, float Height, float Displacement, __global float4 *Mesh, __global float4 *Colors) { // Get values for current iteration int tid_x = get_global_id(0), tid_y = get_global_id(1), indx = tid_y * get_global_size(0) + tid_x;   // Init variables float4 color, vertex; //int2 pos = (int2)(tid_x, tid_y); // Floating-point position in 0 > 1 range float4 posFloat = (float4)((float)tid_x / Width, (float)tid_y / Height, 0.0, 1.0);     sampler_t smp = CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_NEAREST;   // Sample colour from base image color = read_imagef(BaseImg, smp, (int2)(tid_x, tid_y));   // Write color at index in Colors output array Colors[indx] = color;   // Displacement is determined by the displacement amount * the "length" of the color vector (ie approximate brightness) /*vertex = (float4) ((float)tid_x / get_global_size(0) - 0.5, 1.0 - (float)tid_y / get_global_size(1) - 0.5, Displacement * length(color.xyzw), 1.0);*/     // Write mesh value at index of Mesh output array Mesh[indx] = makeSphere(posFloat, 0.5); }```

It's obviously just supposed to bend the vertices around into a sphere, but I get an error
Quote:

kernel referenced an external function css, that can not be found
I'm sure it's something very simple I'm doing wrong...

a|x
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• 10-07-2009, 03:36 AM
toneburst
Re: Function Question
Sorry to have wasted your time guys- it was a typo....
:oops:

I was thinking 'css' meant something other than a mistyping of 'cos'

a|x
• 10-07-2009, 04:48 AM
dbs2
Re: Function Question
You should be able to get the line number of the error by requesting the build log back from clGetProgramBuildInfo.