Fragment shaders describe how polygons are painted (or textured). Read Basics of WebGL (Drawing a Cube) first.
Sample fragment vertex
Parameters could be passed here as written at Vertex Shaders.
precision highp float;// parameter from Vertex Shadervarying vec4 v_positionWithOffset;// parameters passed from Javascript loopuniform float slide;uniform float aspect;void main(void){ // color, attached to current verticle {r,g,b,alpha} // same a[ // v_positionWithOffset.x, // v_positionWithOffset.y, // v_positionWithOffset.z, // 1 // ] gl_FragColor=vec4(v_positionWithOffset.xyz,1);}```