teach

let frag, vert

​

frag=`

precision highp float;

​

uniform vec2 dimensions; //x,y

​

uniform float frames;

​

//gl_FragCoord - x,y

//gl_FragColor - vec4(1.0,0.0,0.0,1.0);

​

void main(){

  vec2 norm_coords=gl_FragCoord.xy/dimensions;

  gl_FragColor=vec4(norm_coords.x,norm_coords.y,0.0,1.0);

}

`

​

vert=`

precision highp float;

attribute vec3 aPosition;

void main()

{

vec4 positionVec4=vec4(aPosition, 1.0);

positionVec4.xy=positionVec4.xy * 2.0 - 1.0;

gl_Position=positionVec4;

}

`