gradient.frag

#ifdef GL_ES
precision highp float;
#endif

uniform float time;
uniform vec2 resolution;
uniform vec2 mouse;
uniform vec3 spectrum;

uniform sampler2D texture0;
uniform sampler2D texture1;
uniform sampler2D texture2;
uniform sampler2D texture3;
uniform sampler2D prevFrame;
uniform sampler2D prevPass;

varying vec3 v_normal;
varying vec2 v_texcoord;

void main(void)
{
    vec2 uv = v_texcoord;
    
    float red = 0.5 + 0.5 * sin(time * 1.0 + uv.x * 3.0 + uv.y * 0.0);
    float green = 0.5 + 0.5 * sin(time * 0.5 + uv.x * 0.0 + uv.y * 3.0);
    float blue = 0.5 + 0.5 * sin(time * 0.75 + uv.x * 2.0 + uv.y * 2.0);
    
    
    gl_FragColor = vec4(
        red * (1.0 - spectrum.x * .2),
        green * (1.0 - spectrum.y * .2),
        blue,
        1.0);
}