obs-powershell

0.2

Commands/Shaders/Get-OBSPagePeelShader.ps1

function Get-OBSPagePeelShader {

[Alias('Set-OBSPagePeelShader','Add-OBSPagePeelShader')]
param(
# Set the Speed of OBSPagePeelShader
[ComponentModel.DefaultBindingProperty('Speed')]
[Single]
$Speed,
# Set the Position of OBSPagePeelShader
[ComponentModel.DefaultBindingProperty('Position')]
[Single]
$Position,
# The name of the source. This must be provided when adding an item for the first time
[Parameter(ValueFromPipelineByPropertyName)]
[Alias('SceneItemName')]
[String]
$SourceName,
# The name of the filter. If this is not provided, this will default to the shader name.
[Parameter(ValueFromPipelineByPropertyName)]
[String]
$FilterName,
# The inline value of the shader. This will normally be provided as a default parameter, based off of the name.
[Alias('ShaderContent')]
[String]
$ShaderText,
# If set, will force the recreation of a shader that already exists
[Management.Automation.SwitchParameter]
$Force,
# If set, will pass thru the commands that would be sent to OBS (these can be sent at any time with Send-OBS)
[Management.Automation.SwitchParameter]
$PassThru,
# If set, will not wait for a response from OBS (this will be faster, but will not return anything)
[Management.Automation.SwitchParameter]
$NoResponse,
# If set, use the shader elapsed time, instead of the OBS system elapsed time
[ComponentModel.DefaultBindingProperty('use_shader_elapsed_time')]
[Management.Automation.SwitchParameter]
$UseShaderTime
)


process {
$shaderName = 'page-peel'
$ShaderNoun = 'OBSPagePeelShader'
if (-not $psBoundParameters['ShaderText']) {    
    $psBoundParameters['ShaderText'] = $ShaderText = '
// Simple Page Peel, Version 0.01, for OBS Shaderfilter
// Copyright ©️ 2023 by SkeletonBow
// License: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
// Contact info:
// Twitter: <https://twitter.com/skeletonbowtv>
// Twitch: <https://twitch.tv/skeletonbowtv>
// YouTube: <https://youtube.com/@skeletonbow>
// Soundcloud: <https://soundcloud.com/skeletonbowtv>
//
// Based on Shadertoy shader <https://www.shadertoy.com/view/3s2SzW> by droozle <https://www.shadertoy.com/user/droozle>
//
// Description:
//
//
// Changelog:
// 0.01 - Initial release

uniform float Speed<
    string label = "Speed";
    string widget_type = "slider";
    float minimum = 0.0;
    float maximum = 50.0;
    float step = 0.001;
> = 1.00;
uniform float Position<
    string label = "Position";
    string widget_type = "slider";
    float minimum = 0.0;
    float maximum = 100.0;
    float step = 0.001;
> = 0.0;

float4 mainImage( VertData v_in ) : TARGET
{
    // Normalized pixel coordinates (from 0 to 1)
    float2 aspect = float2( uv_size.x / uv_size.y, 1.0 );
    float2 uv = v_in.uv;

    float t = Position + elapsed_time * Speed;
    // Define the fold.
    float2 origin = float2( 0.6 + 0.4 * sin( t * 0.2 ), 0.5 + 0.5 * cos( t * 0.13 ) ) * aspect;
    float2 normal = normalize( float2( 1.0, 2.0 * sin( t * 0.3 ) ) * aspect );

    // Sample texture.
    float3 col = image.Sample( textureSampler, uv ).rgb; // Front color.
    
    // Check on which side the pixel lies.
    float2 pt = uv * aspect - origin;
    float side = dot( pt, normal );
    if( side > 0.0 ) {
        col *= 0.25; // Background color (peeled off).
            
        float shadow = smoothstep( 0.0, 0.05, side );
        col = lerp( col * 0.6, col, shadow );
    }
    else {
        // Find the mirror pixel.
        pt = ( uv * aspect - 2.0 * side * normal ) / aspect;
        
        // Check if we''re still inside the image bounds.
        if( pt.x >= 0.0 && pt.x < 1.0 && pt.y >= 0.0 && pt.y < 1.0 ) {
            float4 back = image.Sample( textureSampler, pt ); // Back color.
            back.rgb = back.rgb * 0.25 + 0.75;
            
            float shadow = smoothstep( 0.0, 0.2, -side );
            back.rgb = lerp( back.rgb * 0.2, back.rgb, shadow );
            
            // Support for transparency.
            col = lerp( col, back.rgb, back.a );
        }
    }
    
    // Output to screen
    return float4(col,1.0);
}

'
}
$MyVerb, $myNoun = $MyInvocation.InvocationName -split '-',2
if (-not $myNoun) {
    $myNoun = $myVerb
    $myVerb = 'Get'    
}
switch -regex ($myVerb) {
    Get {
        $FilterNamePattern = "(?>$(
            if ($FilterName) {
                [Regex]::Escape($FilterName)
            }
            else {
                [Regex]::Escape($ShaderNoun -replace '^OBS' -replace 'Shader$'),[Regex]::Escape($shaderName) -join '|'
            }
        ))"
        if ($SourceName) {
            Get-OBSInput | 
                Where-Object InputName -eq $SourceName |
                Get-OBSSourceFilterList |
                Where-Object FilterName -Match $FilterNamePattern
        } else {
            $obs.Inputs |
                Get-OBSSourceFilterList |
                Where-Object FilterName -Match $FilterNamePattern
        }        
    }
    'Remove' {
        if ($SourceName) {
            Get-OBSInput | 
                Where-Object InputName -eq $SourceName |
                Get-OBSSourceFilterList |
                Where-Object FilterName -Match $FilterNamePattern |
                Remove-OBSSourceFilter
        }
    }
    '(?>Add|Set)' {
        $ShaderSettings = [Ordered]@{}
        :nextParameter foreach ($parameterMetadata in $MyInvocation.MyCommand.Parameters[@($psBoundParameters.Keys)]) {
            foreach ($parameterAttribute in $parameterMetadata.Attributes) {
                if ($parameterAttribute -isnot [ComponentModel.DefaultBindingPropertyAttribute]) { continue }
                $ShaderSettings[$parameterAttribute.Name] = $PSBoundParameters[$parameterMetadata.Name]
                if ($ShaderSettings[$parameterAttribute.Name] -is [switch]) {
                    $ShaderSettings[$parameterAttribute.Name] = $ShaderSettings[$parameterAttribute.Name] -as [bool]
                }
                continue nextParameter
            }            
        }

        if (-not $PSBoundParameters['FilterName']) {
            $filterName = $PSBoundParameters['FilterName'] = $shaderName
        }

        $ShaderFilterSplat = [Ordered]@{
            ShaderSetting = $ShaderSettings
            FilterName = $FilterName
            SourceName = $SourceName
        }        

        foreach ($CarryOnParameter in "PassThru", "NoResponse","Force") {
            if ($PSBoundParameters.ContainsKey($CarryOnParameter)) {
                $ShaderFilterSplat[$CarryOnParameter] = $PSBoundParameters[$CarryOnParameter]
            }
        }

        if (-not $script:CachedShaderFilesFromCommand) {
            $script:CachedShaderFilesFromCommand = @{}
        }

        if ($Home -and -not $script:CachedShaderFilesFromCommand[$shaderName]) {
            $MyObsPowerShellPath = Join-Path $home ".obs-powershell"
            $ThisShaderPath = Join-Path $MyObsPowerShellPath "$shaderName.shader"
            $shaderText | Set-Content -LiteralPath $ThisShaderPath
            $script:CachedShaderFilesFromCommand[$shaderName] = Get-Item -LiteralPath $ThisShaderPath
        }
        if ($script:CachedShaderFilesFromCommand[$shaderName]) {
            $ShaderFilterSplat.ShaderFile = $script:CachedShaderFilesFromCommand[$shaderName].FullName
        } else {
            $ShaderFilterSplat.ShaderText = $shaderText
        }        

        if ($myVerb -eq 'Add') {                        
            Add-OBSShaderFilter @ShaderFilterSplat
        } else {
            Set-OBSShaderFilter @ShaderFilterSplat
        }
    }
}

}


}