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!