#version 300 es

/* Pepy by @ohsqueezy [ohsqueezy.itch.io] */

precision mediump float;
in vec2 uv;
in vec3 color;
uniform sampler2D base_texture;
uniform vec3 blend_min_hsv;
uniform float time;
uniform bool scroll;
uniform bool textured;
out vec4 myOutputColor;

/* from http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl, licensed under WTFPL */
vec3 hsv2rgb(vec3 c)
{
    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}

void main(void)
{
    if (textured)
    {
        // if (scroll)
        // {
        //     ivec2 texture_size = textureSize(base_texture, 0);
        //     float speed = time * 35.0;
        //     gl_FragColor = texelFetch(base_texture, ivec2(mod(vec2(gl_FragCoord.x + speed, gl_FragCoord.y - speed), texture_size)), 0);
        // }
        // else
        // {
            myOutputColor = texture(base_texture, uv);
        // }
    }
    else
    {
        myOutputColor = vec4(color, 1.0);
    }
    /* apply blending, leaving alpha unchanged */
    myOutputColor.xyz = min(myOutputColor.xyz, hsv2rgb(blend_min_hsv));
}