1 files changed, 70 insertions, 0 deletions
diff --git a/config/picom/shaders/default_anim.glsl b/config/picom/shaders/default_anim.glsl
new file mode 100644
index 0000000..e4f43ed
--- /dev/null
+++ b/config/picom/shaders/default_anim.glsl
@@ -0,0 +1,70 @@
+#version 330
+
+in vec2 texcoord;             // texture coordinate of the fragment
+
+uniform sampler2D tex;        // texture of the window
+
+
+ivec2 window_size = textureSize(tex, 0); // Size of the window
+ivec2 window_center = ivec2(window_size.x/2, window_size.y/2);
+
+/*
+These shaders use a sorta hacky way to use the changing
+window opacity you might set on picom.conf animation rules
+to perform animations.
+
+Basically, when a window get's mapped, we make it's alpha 
+go from 0 to 1, so, using the default_post_processing to get that alpha
+we can get a variable going from 0 (start of mapping animation)
+to 1 (end of mapping animation)
+
+You can also set up your alpha value to go from 1 to 0 in picom when
+a window is closed, effectively reversing the animations described here
+*/
+
+// Default window post-processing:
+// 1) invert color
+// 2) opacity / transparency
+// 3) max-brightness clamping
+// 4) rounded corners
+vec4 default_post_processing(vec4 c);
+
+//  If you have semitransparent windows (like a terminal)
+// You can use the below function to add an opacity threshold where the
+// animation won't apply. For example, if you had your terminal
+// configured to have 0.8 opacity, you'd set the below variable to 0.8
+float max_opacity = 1;
+float opacity_threshold(float opacity)
+{
+  // if statement jic?
+  if (opacity >= max_opacity)
+  {
+    return 1.0;
+  }
+  else 
+  {
+    return min(1, opacity/max_opacity);
+  }
+
+}
+
+vec4 anim(float time) {
+  vec4 c = texelFetch(tex, ivec2(texcoord), 0);
+  return c;
+}
+
+// Default window shader:
+// 1) fetch the specified pixel
+// 2) apply default post-processing
+vec4 window_shader() {
+  vec4 c = texelFetch(tex, ivec2(texcoord), 0);
+  c = default_post_processing(c);
+  float opacity = opacity_threshold(c.w);
+  if (opacity == 0.0)
+  {
+    return c;
+  }
+  vec4 anim_c = anim(opacity);
+  return default_post_processing(anim_c);
+}
+