import * as THREE from 'three'

type AttributesDescription = {

    vPosition:THREE.Vector3
    
    vTexCoord: THREE.Vector2

}

type VaryingDescription = {

    d: THREE.Vector2

}

const uniforms = {

    uModelViewProjectionMatrix: { value: new THREE.Matrix4 },

    uUVOffset: { value: new THREE.Vector2 },


}

export default {

    attributesDescription: undefined as AttributesDescription | undefined,

    varyingDescription: undefined as VaryingDescription | undefined,

    uniforms: uniforms,
    
    vetexShader: `
    
        precision highp float;

        uniform mat4 uModelViewProjectionMatrix;
        uniform vec2 uUVOffset;
        
        attribute vec3 vPosition;
        attribute vec2 vTexCoord;
        
        varying mediump vec2 d;
        
        
        vec4 mul(mat4 i,vec3 p)     //mulPoint
        {
            return i[0] * p.x + ( i[1] * p.y + ( i[2]*p.z + i[3]) );
        }
        
        void main(void)
        {
            gl_Position= mul( uModelViewProjectionMatrix, vPosition.xyz);
            d = vTexCoord + uUVOffset;
        }
    `,

    fragmentShader: `
    
        precision mediump float;

        #include <matdither.glsl>
        
        uniform sampler2D tAlbedo;
        
        varying mediump vec2 vUv;
        
        void main()
        {
            float albedo=texture2D(tAlbedo,vUv).a;
            
            if(albedo<=f(vUv.x))
            {
                discard;
            }
        
            gl_FragColor=vec4(0.0);
        }
    
    `

}