shaderExample.vert

// automatically set by OF
attribute vec4 position;
attribute vec2 texcoord;
uniform mat4 modelViewProjectionMatrix;

// varying that will be passed to the fragment shader
varying vec2 vUv;

// noop vertex shader
void main() {
	vUv = texcoord;
	gl_Position = modelViewProjectionMatrix * position;
}

// uniforms passed from our update routine
uniform vec2 resolution;
uniform float time;
uniform sampler2D videoTexture;

// varying recieved from the vertex shader
varying vec2 vUv;

// fade effect
void main() {
    vec2 uv = vUv.xy / resolution.xy;
    vec3 a = texture2D(videoTexture, uv).rgb;
    vec3 b = vec3(0.0, 0.0, 0.0);
    vec3 m = mix(a, b, abs(sin(time)));
    gl_FragColor = vec4(m, 1.0);
}