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// Copyright (C) 2021-2023 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
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#include "../base.effect"

//-----------------------------------------------------------------------------
// Uniforms
//-----------------------------------------------------------------------------

uniform texture2d TextureA<
	string field_type = "input";
>;

uniform texture2d TextureB< 
	string field_type = "input";
>;

//-----------------------------------------------------------------------------
// Technique: Flip
//-----------------------------------------------------------------------------

uniform float FlipRate<
	string name = "Flip Rate";
	string field_type = "slider";
	string suffix = " Hz";
	float minimum = 0.01;
	float maximum = 100.0;
	float step = 0.01;
	float scale = 1.00;
> = 10.0;

float4 PSWave(VertexInformation vtx) : TARGET {
	float flip_frequency = 1.f / FlipRate;

	if (fmod(Time.x, flip_frequency) < (flip_frequency / 2.f)) {
		return TextureA.Sample(LinearClampSampler, vtx.texcoord0.xy);
	} else {
		return TextureB.Sample(LinearClampSampler, vtx.texcoord0.xy);
	}
}

technique Flip {	
	pass
	{
		vertex_shader = DefaultVertexShader(vtx);
		pixel_shader = PSWave(vtx);
	}
}