Wireframe shader.

[lukasz1985]

...

[Danny02]

what do you want to achieve? you can already switch the rendermode between point, line and fill

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//side: GL_FRONT_AND_BACK, GL_FRONT or GL_BACK //mode: GL_POINT, GL_LINE or GL_FILL glPolygonMode(side, mode);

[SHC]

I don't know GLSL but for I use what Danny02 said.

1	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

EDIT:

Found this shader. Here's the code.

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varying vec3 v0, v1, v2; varying vec3 normal, vert; void main(void) {   vec3 line, vec, proj;   float dist;   // compute minimum distance from current interpolated 3d vertex to triangle edges   // edge v1-v0   line = normalize(v1 - v0);   vec = vert - v0;   proj = dot(vec, line) * line;   dist = length (vec - proj);   // edge v2-v0   line = normalize(v2 - v0);   proj = dot(vec, line) * line;   dist = min(dist, length (vec - proj));   // edge v2-v1   line = normalize(v2 - v1);   vec = vert - v1;   proj = dot(vec, line) * line;   dist = min(dist, length (vec - proj));   // maximum perpendicular distance to edges inside the triangle is at the centroid   vec3 centroid = (v0 + v1 + v2) / 3.0;   vec = centroid - v1;   proj = dot(vec, line) * line;   float max_dist = length(vec - proj);     // normalize min distance   dist /= max_dist;   // Gaussian falloff from edge   dist = exp(-2.0*dist*dist);     // discard interior of triangle   if (dist < 0.5)    discard;   dist  = 1.0 - dist;   vec4 color = vec4(dist, dist, dist, 1.0);   color = vec4(0.0, 0.0, 0.0, 1.0);   //gl_FragColor = color;   // do some phong shading   vec3 light_dir = normalize( gl_LightSource[0].position.xyz - vert );   vec3 eye_dir = normalize( -vert.xyz );   vec3 ref = normalize( -reflect( light_dir, normal ) );   vec4 ld = color * abs( dot(normal, light_dir) );   vec4 ls = color * pow( abs( dot(ref, eye_dir) ), gl_FrontMaterial.shininess );   gl_FragColor = ld + ls; }