Wipe transition (kivy)

MyWipeTransition.py

from kivy.uix.screenmanager import ShaderTransition
from kivy.properties import StringProperty

class MyWipeTransition(ShaderTransition):

    '''Wipe transition, based on a fragment Shader.
    '''

    WIPE_TRANSITION_FS = '''$HEADER$


    uniform float t;
    uniform sampler2D tex_in;
    uniform sampler2D tex_out;


    void main(void) {
        vec4 cin = texture2D(tex_in, tex_coord0);
        vec4 cout = texture2D(tex_out, tex_coord0);

        gl_FragColor = mix(cout, cin, step(1., tex_coord0.x+t) );
    }
    '''
    fs = StringProperty(WIPE_TRANSITION_FS)

Wipe transition.
imo, blurring (blending?) the edges of textures (what the default wipe transition does) is old-fashioned.
So i fixed it

demo gif
https://imgur.com/a/yK311Sd