#version 440 core

layout (binding = 0, rgba16f) restrict writeonly uniform image2D imageOut;
layout (binding = 1, rgba16f) restrict readonly uniform image2D imageIn;

layout (local_size_x=16, local_size_y=16) in;

#define MAX_POSITIONS 100
uniform vec3 positions[MAX_POSITIONS];
uniform int positionCount;

uniform float osg_SimulationTime;
uniform vec2 offset;

#include "lib/water/ripples.glsl"

void main()
{
    ivec2 texel = ivec2(gl_GlobalInvocationID.xy + offset);

    vec4 color = imageLoad(imageIn, texel);
    float wavesizeMultiplier = getTemporalWaveSizeMultiplier(osg_SimulationTime);
    for (int i = 0; i < positionCount; ++i)
    {
        float wavesize = wavesizeMultiplier * positions[i].z;
        float displace = clamp(0.2 * abs(length((positions[i].xy + offset) - vec2(gl_GlobalInvocationID.xy)) / wavesize - 1.0) + 0.8, 0.0, 1.0);
        color.rg = mix(vec2(-1.0), color.rg, displace);
    }

    imageStore(imageOut, ivec2(gl_GlobalInvocationID.xy), color);
}