#version 330

// TODO: for now this is just a scanline shader for testing

// Input vertex attributes (from vertex shader)
in vec2 fragTexCoord;
in vec4 fragColor;

// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;

// Output fragment color
out vec4 finalColor;

// NOTE: Add here your custom variables

// NOTE: Render size values must be passed from code
const float renderWidth = 800;
const float renderHeight = 450;
float offset = 0.0;

uniform float time;

void main()
{
    float frequency = renderHeight/3.0;
    // Scanlines method 2
    float globalPos = (fragTexCoord.y + offset) * frequency;
    float wavePos = cos((fract(globalPos) - 0.5)*3.14);

    // Texel color fetching from texture sampler
    vec4 texelColor = texture(texture0, fragTexCoord);

    finalColor = mix(vec4(0.0, 0.3, 0.0, 0.0), texelColor, wavePos);
}