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<languageVersion : 1.0;>

kernel PlasmaEffect
<   namespace : "com.mrdoob.shaders";
    vendor : "Mr.doob";
    version : 1;
    description : "Good old plasma effect";
>
{
    output pixel4 dst;
    
    #if !AIF_FLASH_TARGET
    
    parameter float2 size
    <
        minValue:float2(0,0);
        maxValue:float2(1024,1024);
        defaultValue:float2(1024, 512);
    >;
    
    #endif
    
    parameter float2 center
    <
        minValue:float2(0,0);
        maxValue:float2(1024,1024);
        defaultValue:float2(512,256);
    >;

    parameter float distort
    <
        minValue:float(0);
        maxValue:float(0.1);
        defaultValue:float(0.0);
    >;

    parameter float2 offset
    <
        minValue:float2(-100,-100);
        maxValue:float2(100,100);
        defaultValue:float2(0,0);
    >;

    parameter float3 color_offset
    <
        minValue:float3(-5,-5,-5);
        maxValue:float3(5,5,5);
        defaultValue:float3(0,0,0);
    >;
    
    parameter float2 wave
    <
        minValue:float2(0,0);
        maxValue:float2(0.1,0.1);
        defaultValue:float2(0.05,0.05);
    >;

    #if !AIF_FLASH_TARGET

    region generated()
    {
        return region(float4(0, 0, size.x, size.y));
    }
    
    #endif

    void evaluatePixel()
    {
        float2 pos = outCoord();
        
        float2 dist = pos - center;
        float distance = sqrt((dist.x * dist.x) + (dist.y * dist.y)) * distort;
        
        float color = cos((offset.x + pos.x) * wave.x) + sin((offset.y + pos.y) * wave.y) + sin(distance) + cos(distance);
        
        dst = pixel4(color + color_offset.x, color + color_offset.y, color + color_offset.z, 1.0);
    }
}