1 files changed, 30 insertions, 0 deletions
diff --git a/src/effects/shaders_ng/rectangularglow.frag b/src/effects/shaders_ng/rectangularglow.frag
new file mode 100644
index 0000000..cf20b93
--- /dev/null
+++ b/src/effects/shaders_ng/rectangularglow.frag
@@ -0,0 +1,30 @@
+#version 440
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(std140, binding = 0) uniform buf {
+    // qt_Matrix and qt_Opacity must always be both present
+    // if the built-in vertex shader is used.
+    mat4 qt_Matrix;
+    float qt_Opacity;
+    vec4 color;
+    float relativeSizeX;
+    float relativeSizeY;
+    float spread;
+};
+
+float linearstep(float e0, float e1, float x)
+{
+    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
+}
+
+void main()
+{
+    float alpha =
+        smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - qt_TexCoord0.x)) *
+        smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - qt_TexCoord0.y));
+
+    float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
+    fragColor = color * qt_Opacity * spreadMultiplier * spreadMultiplier;
+}