Shader swizzling

[kuuuurija]

Hi,

 

I am playing with Shaders (filters). Below is my shader code

I am not able to swizzle rgba values (https://www.opengl.org/wiki/GLSL_Optimizations). Can someone help?

 

precision mediump float;

varying vec2 vTextureCoord;
varying vec4 vColor;

uniform sampler2D uSampler;
uniform float customUniform;

void main(void)
{
   vec2 uvs = vTextureCoord.xy;

   vec4 fg = texture2D(uSampler, vTextureCoord);


   // THIS doesn't work
   // fg.rg = 0.0;

   fg.r = 0.0;
   fg.g = 0.0;
      
   gl_FragColor = fg;

}

 

[kuuuurija]

my bad .. it works

Should typecast to vec2

fg.rg = vec2(0.0);