<languageVersion: 1.0;>
kernel Mixer4Channel
<
	namespace: "com.kevingoldsmith";
	vendor: "Kevin Goldsmith";
	version: 1;
	description: "4 channel stereo audio mixer";
>
{
	input image4 src1;
	input image4 src2;
	input image4 src3;
	input image4 src4;
	output pixel4 dst;

	parameter float4 volume
	<
		minValue: float4(0.0);
		maxValue: float4(1.2);
		defaultValue: float4(1.0);
	>;
	
	void evaluatePixel()
	{
		dst = ((sampleNearest(src1, outCoord())*volume[0]) +
		       (sampleNearest(src2, outCoord())*volume[1]) +
		       (sampleNearest(src3, outCoord())*volume[2]) +
		       (sampleNearest(src4, outCoord())*volume[3]));
	}
}