obs-StreamFX/data/examples/shaders/filter/bulge_pinch.effect

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// Copyright (C) 2021 Radegast-FFXIV <radegast.ffxiv@gmail.com>
// Copyright (C) 2023 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
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// Copyright 2021 Radegast Stravinsky <radegast.ffxiv@gmail.com>
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#include "../base.effect"
//-----------------------------------------------------------------------------
// Uniforms
//-----------------------------------------------------------------------------

// Provided by StreamFX
uniform float4 Time<
	bool automatic = true;
>;
uniform float4 ViewSize<
	bool automatic = true;
>;
uniform texture2d InputA<
	bool automatic = true;
>;

uniform float radius<
	string name = "Radius";
	string description = "The radius of the effect.";
	string field_type = "slider";
	float step = 0.01;
	float minimum = 0.0;
	float maximum = 1.0;
> = 0.5;

uniform float2 coordinates<
	string name = "Coordinates (X, Y)";
	string description = "Determines the center of the effect.";
	string field_type = "slider";
	float2 step = {0.01, 0.01};
	float2 minimum = {0.0, 0.0};
	float2 maximum = {1.0, 1.0};
> = {0.5, 0.5};

uniform float magnitude<
	string name = "Magnitude";
	string description = "The magnitude of the distortion.";
	string field_type = "slider";
	float minimum = -1.0;
	float maximum = 1.0;
> = 1.0;

uniform float tension<
	string name = "Tension";
	string description = "Controls how rapidly the distortion reaches the maximum value.";
	string field_type = "slider";
	float step = 0.01;
	float minimum = 0.0;
	float maximum = 10.0;
> = 1.0;

uniform float aspect_ratio<
	string name = "Aspect Ratio";
	string description = "Adjusts the aspect ratio for the associated distortion.";
	string field_type = "slider";
	float step = 0.01;
	float minimum = -1;
	float maximum = 1;
> = 0.0;

uniform bool animate<
	string name = "Animate";
	string description = "Animates the effect, making it alternate between pinching and bulging.";
> = false;

//-----------------------------------------------------------------------------
// Structs
//-----------------------------------------------------------------------------
struct VertexData {
	float4 pos : POSITION;
	float2 uv : TEXCOORD0;
};

//-----------------------------------------------------------------------------
// Samplers
//-----------------------------------------------------------------------------
sampler_state texture_sampler {
	Filter    = Linear;
	AddressU  = Mirror;
	AddressV  = Mirror;
};

//-----------------------------------------------------------------------------
// Functions
//-----------------------------------------------------------------------------
float4 PSBulgePinch(VertexData vtx) : TARGET {
	const float ar_raw = 1. * ViewSize.y / ViewSize.x;
    float ar = lerp(ar_raw, 1, aspect_ratio);

    float2 center = coordinates/2.0;
    float2 tc = vtx.uv - center;

    float4 color;

    center.x /= ar;
    tc.x /= ar;

    float dist = distance(tc, center);
    float anim_mag = (animate == 1 ? magnitude * sin(Time.x) : magnitude);
    if (dist < radius && anim_mag != 0)
    {
        float tension_radius = lerp(dist, radius, tension);
        float percent = (dist)/tension_radius;
        if(anim_mag > 0)
            tc = (tc-center) * lerp(1.0, smoothstep(0.0, tension_radius/dist, percent), anim_mag * 0.75);
        else
            tc = (tc-center) * lerp(1.0, pow(abs(percent), 1.0 + anim_mag * 0.75) * tension_radius/dist, 1.0 - percent);

        tc += (2*center);
        tc.x *= ar;

        color = InputA.Sample(texture_sampler, tc);
    }
    else {
        color = InputA.Sample(texture_sampler, vtx.uv);
    }

    return color;
}

technique BulgePinch {
	pass
	{
		vertex_shader = DefaultVertexShader(vtx);
		pixel_shader = PSBulgePinch(vtx);
	}
}