obs-StreamFX/data/examples/shaders/filter/wave.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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#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 magnitude<
	string name = "Magnitude";
	string description = "The magnitude of the distortion.";
	string field_type = "slider";
	float minimum = 0.0;
	float maximum = 10.0;
> = 1.0;

uniform float angle<
    string name = "Angle";
    string description = "The amount of oscillation in the image.";
    string field_type = "slider";
    float minimum = -1800.0;
    float maximum = 1800.0;
> = 90.0;

uniform float period<
	string name = "Period";
	string description = "The frequency at which the wave oscillation occurs.";
	string field_type = "slider";
	float minimum = 0.0;
	float maximum = 10.0;
> = 0.5;

uniform float phase<
    string name = "Phase";
    string description = "Adjusts the phase of the wave.";
	string field_type = "slider";
	float minimum = -1.0;
	float maximum = 1.0;
> = 0.0;

uniform float amplitude<
	string name = "Amplitude";
	string description = "Adjusts the amplitude of the wave.";
	string field_type = "slider";
	float minimum = -1.0;
	float maximum = 1.0;
> = 0.25;

uniform int wave_type<
	string name = "Wave Type";
	string description = "The wave distortion type to use.";
	string field_type = "enum";
	// Enumeration
	int enum = 2;
	int enum_0 = 0;
	string enum_0_name = "X/X";
	int enum_1 = 1;
	string enum_1_name = "X/Y";
> = 1;

uniform int animate<
	string name = "Animate By";
	string description = "Animates the wave distortion by one of the parameters.";
	string field_type = "enum";
	// Enumeration
	int enum = 4;
	int enum_0 = 0;
	string enum_0_name = "None";
	int enum_1 = 1;
	string enum_1_name = "Amplitude";
	int enum_2 = 2;
	string enum_2_name = "Phase";
	int enum_3 = 3;
	string enum_3_name = "Angle";
> = 0;

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

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

//-----------------------------------------------------------------------------
// Functions
//-----------------------------------------------------------------------------
float4 PSWave(VertexData vtx) : TARGET {
	const float ar = 1.0 * (float)ViewSize.y / (float)ViewSize.x;
    float2 tc = vtx.uv;
    const float2 center = float2(0.5 / ar, 0.5);
    float4 color;

    tc.x /= ar;

    const float theta = radians(animate == 3 ? (Time.x * 5 % 360.0) : angle);
    const float s =  sin(theta);
    const float _s = sin(-theta);
    const float c =  cos(theta);
    const float _c = cos(-theta);

    tc = float2(dot(tc - center, float2(c, -s)), dot(tc - center, float2(s, c)));
        if(wave_type == 0)
        {
            switch(animate)
            {
                default:
                    tc.x += amplitude * sin((tc.x * period * 10) + phase);
                    break;
                case 1:
                    tc.x += (sin(Time.x) * amplitude) * sin((tc.x * period * 10) + phase);
                    break;
                case 2:
                    tc.x += amplitude * sin((tc.x * period * 10) + Time.x);
                    break;
            }
        }
        else
        {
            switch(animate)
            {
                default:
                    tc.x +=  amplitude * sin((tc.y * period * 10) + phase);
                    break;
                case 1:
                    tc.x += (sin(Time.x) * amplitude) * sin((tc.y * period * 10) + phase);
                    break;
                case 2:
                    tc.x += amplitude * sin((tc.y * period * 10) + Time.x);
                    break;
            }
        }
        tc = float2(dot(tc, float2(_c, -_s)), dot(tc, float2(_s, _c))) + center;

        tc.x *= ar;

        color = InputA.Sample(texture_sampler, tc);

    return color;
}

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