Hey there I’m wondering if someone with more experience using shaders can help me out…

I’m trying to use some shaders like:

pointlight.vert:

```
varying vec4 diffuse,ambientGlobal,ambient;
varying vec3 normal,lightDir,halfVector;
varying float dist;
void main()
{
vec4 ecPos;
vec3 aux;
normal = normalize(gl_NormalMatrix * gl_Normal);
/* these are the new lines of code to compute the light's direction */
ecPos = gl_ModelViewMatrix * gl_Vertex;
aux = vec3(gl_LightSource[0].position-ecPos);
lightDir = normalize(aux);
dist = length(aux);
halfVector = normalize(gl_LightSource[0].halfVector.xyz);
/* Compute the diffuse, ambient and globalAmbient terms */
diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
/* The ambient terms have been separated since one of them */
/* suffers attenuation */
ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
ambientGlobal = gl_LightModel.ambient * gl_FrontMaterial.ambient;
gl_Position = ftransform();
}
```

and

pointlight.frag:

```
varying vec4 diffuse,ambientGlobal, ambient;
varying vec3 normal,lightDir,halfVector;
varying float dist;
void main()
{
vec3 n,halfV,viewV,ldir;
float NdotL,NdotHV;
vec4 color = ambientGlobal;
float att;
/* a fragment shader can't write a varying variable, hence we need
a new variable to store the normalized interpolated normal */
n = normalize(normal);
/* compute the dot product between normal and normalized lightdir */
NdotL = max(dot(n,normalize(lightDir)),0.0);
if (NdotL > 0.0) {
att = 1.0 / (gl_LightSource[0].constantAttenuation +
gl_LightSource[0].linearAttenuation * dist +
gl_LightSource[0].quadraticAttenuation * dist * dist);
color += att * (diffuse * NdotL + ambient);
halfV = normalize(halfVector);
NdotHV = max(dot(n,halfV),0.0);
color += att * gl_FrontMaterial.specular * gl_LightSource[0].specular *
pow(NdotHV,gl_FrontMaterial.shininess);
}
gl_FragColor = color;
}
```

I’m wondering how to actually use this shaders with openFrameworks. I kind of get how to use a shader when there’s a sampler2Drect to bind a texture to, but I have no idea how to implement the code above.

Any help would be great, although I’m not so much after links to shader resources as a demo of how to use ofShader with an ofMesh or ofTexture and a shader like the one above…there are lot’s of shaders out there, but I just can’t figure out how to use 'em