obs-powershell

0.2

Commands/Shaders/Get-OBSHueRotatonShader.ps1

function Get-OBSHueRotatonShader {

[Alias('Set-OBSHueRotatonShader','Add-OBSHueRotatonShader')]
param(
# Set the Speed of OBSHueRotatonShader
[ComponentModel.DefaultBindingProperty('Speed')]
[Single]
$Speed,
# Set the Hue_Override of OBSHueRotatonShader
[Alias('Hue_Override')]
[ComponentModel.DefaultBindingProperty('Hue_Override')]
[Management.Automation.SwitchParameter]
$HueOverride,
# 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 = 'hue-rotaton'
$ShaderNoun = 'OBSHueRotatonShader'
if (-not $psBoundParameters['ShaderText']) {    
    $psBoundParameters['ShaderText'] = $ShaderText = '
// Hue Rotation shader, version 1.0 for OBS Shaderfilter
// Copyright ©️ 2023 by SkeletonBow
// License: GNU General Public License, version 2
//
// Contact info:
// Twitter: <https://twitter.com/skeletonbowtv>
// Twitch: <https://twitch.tv/skeletonbowtv>
// YouTube: <https://youtube.com/@skeletonbow>
// Soundcloud: <https://soundcloud.com/skeletonbowtv>
//
// Description:
// Rotates hue of input at a user configurable speed. Negative speed values reverse rotation. A hue
// override option is provided to force a specific rotating hue instead of the original image''s hue.
//
// Changelog:
// 1.0 - Initial release

/*
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   version 2 as published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

uniform float Speed<
    string label = "Speed";
    string widget_type = "slider";
    float minimum = 0.0;
    float maximum = 100.0;
    float step = 0.001;
> = 10.00;
uniform bool Hue_Override = false;

float3 HUEtoRGB(in float H)
{
    float R = abs(H * 6 - 3) - 1;
    float G = 2 - abs(H * 6 - 2);
    float B = 2 - abs(H * 6 - 4);
    return saturate(float3(R,G,B));
}

#define Epsilon 1e-10
 
float3 RGBtoHCV(in float3 RGB)
{
    // Based on work by Sam Hocevar and Emil Persson
    float4 P = (RGB.g < RGB.b) ? float4(RGB.bg, -1.0, 2.0/3.0) : float4(RGB.gb, 0.0, -1.0/3.0);
    float4 Q = (RGB.r < P.x) ? float4(P.xyw, RGB.r) : float4(RGB.r, P.yzx);
    float C = Q.x - min(Q.w, Q.y);
    float H = abs((Q.w - Q.y) / (6 * C + Epsilon) + Q.z);
    return float3(H, C, Q.x);
}

float3 HSVtoRGB(in float3 HSV)
{
    float3 RGB = HUEtoRGB(HSV.x);
    return ((RGB - 1) * HSV.y + 1) * HSV.z;
}

float3 RGBtoHSV(in float3 RGB)
{
    float3 HCV = RGBtoHCV(RGB);
    float S = HCV.y / (HCV.z + Epsilon);
    return float3(HCV.x, S, HCV.z);
}

float4 mainImage( VertData v_in ) : TARGET
{
    float2 uv = v_in.uv;
    float4 col_in = image.Sample(textureSampler, uv);
    float3 col_out;
    float3 HSV = RGBtoHSV(col_in.rgb);

    if(Hue_Override)
        HSV.x = elapsed_time * Speed * 0.01;
    else
        HSV.x += elapsed_time * Speed * 0.01;

    // Normalize Hue
    HSV.x = frac(HSV.x);
    
    col_out = HSVtoRGB(HSV);
    return float4(col_out, col_in.a);
}

'
}
$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
        }
    }
}

}


}