Different shaders for geometry, lines and text?

Hi!

I'm trying to add some basic fog effect through the new PShader object. Found this fairly simple glsl shader and adapted to my purposes. I would like to replace only the fragment shader and keep using the "default" vertex shader, but I couldn't find how to do it, so I made a basic vertex shader using the minimum attributes, which fall in the FLAT shader type.

Here is my test code:

1. 
   PShader fog;
   
   void setup() {
     size(640, 360, P3D);
     fog = loadShader("fogF.glsl", "fogV.glsl");
2.   fog.set("fogNear", 0.0);
     fog.set("fogFar", 500.0);
     hint(DISABLE_DEPTH_TEST);
   }
   
   void draw() {
       shader(fog);
     background(0);
     noStroke();
     translate(mouseX, mouseY, -100);
     box(200);
     fill(255,0,0);
     box(100);
     stroke(255);
     strokeWeight(10);
     line(0,0,0, width/2, height/2, 100);
     line(0,0,0, -width/2, height/2, 100);
     text("shader", 100,0,100);
   }

The vertex shader:

1. uniform mat4 projmodelviewMatrix;
   
   attribute vec4 inVertex;
   attribute vec4 inColor;
   
   varying vec4 vColor;
   
   void main() {
     // Vertex in clip coordinates
     gl_Position = projmodelviewMatrix * inVertex;
     vColor = inColor;
   }
   

The fragment shader:

1. #ifdef GL_ES
   precision highp float;
   #endif
   
   uniform float fogNear;
   uniform float fogFar;
   varying vec4 vColor;
   
   void main(){
       vec3 fogColor = vec3(1.0,1.0,1.0);
       gl_FragColor = vColor;
       float depth = gl_FragCoord.z / gl_FragCoord.w;
       float fogFactor = smoothstep(fogNear, fogFar, depth);
       gl_FragColor = mix(gl_FragColor, vec4(fogColor, gl_FragColor.w), fogFactor);
   
   }
   
   

The FLAT type shader only works for filled untextured geometry, so, do I need to write another one using the LINES type attributes  to apply the fog effect to lines and another one for text? It feels very convoluted for a simple effect, is there a way to simplify it?

Cheers!