From 5b40ac154840d25e116275132f1a8c63a467b314 Mon Sep 17 00:00:00 2001
From: itsmattkc <34096995+itsmattkc@users.noreply.github.com>
Date: Mon, 20 Mar 2023 10:27:30 -0700
Subject: [PATCH] mask: handle alpha channel too when inverting

---
 app/node/distort/mask/mask.cpp |  2 +-
 app/shaders/invertrgba.frag    | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 app/shaders/invertrgba.frag

diff --git a/app/node/distort/mask/mask.cpp b/app/node/distort/mask/mask.cpp
index 1dc0acb49..71e789e4e 100644
--- a/app/node/distort/mask/mask.cpp
+++ b/app/node/distort/mask/mask.cpp
@@ -47,7 +47,7 @@ ShaderCode MaskDistortNode::GetShaderCode(const ShaderRequest &request) const
   } else if (request.id == QStringLiteral("feather")) {
     return ShaderCode(FileFunctions::ReadFileAsString(QStringLiteral(":/shaders/blur.frag")));
   } else if (request.id == QStringLiteral("invert")) {
-    return ShaderCode(FileFunctions::ReadFileAsString(QStringLiteral(":/shaders/invertrgb.frag")));
+    return ShaderCode(FileFunctions::ReadFileAsString(QStringLiteral(":/shaders/invertrgba.frag")));
   } else {
     return super::GetShaderCode(request);
   }
diff --git a/app/shaders/invertrgba.frag b/app/shaders/invertrgba.frag
new file mode 100644
index 000000000..05d25345f
--- /dev/null
+++ b/app/shaders/invertrgba.frag
@@ -0,0 +1,12 @@
+// Input texture
+uniform sampler2D tex_in;
+
+// Input texture coordinate
+in vec2 ove_texcoord;
+out vec4 frag_color;
+
+void main() {
+    vec4 color = texture(tex_in, ove_texcoord);
+    color = 1.0 - color;
+    frag_color = color;
+}