<postprocess>, fix tab open/close, fix some URL bugs

flumi/Shaders/film.gdshader

@@ -0,0 +1,20 @@
+shader_type canvas_item;
+
+// Uniforms
+uniform sampler2D screen_texture : hint_screen_texture;
+uniform float grain_amount : hint_range(0.0, 1.0) = 0.05; // Adjust the amount of grain
+uniform float grain_size : hint_range(0.1, 10.0) = 1.0; // Adjust the size of the grain
+
+void fragment() {
+    // Sample the original screen texture
+    vec4 original_color = texture(screen_texture, SCREEN_UV);
+
+    // Generate random noise
+    float noise = (fract(sin(dot(UV, vec2(12.9898, 78.233))) * 43758.5453) - 0.5) * 2.0;
+
+    // Add noise to the original color
+    original_color.rgb += noise * grain_amount * grain_size;
+
+    // Clamp the final color to make sure it stays in the valid range
+    COLOR = clamp(original_color, 0.0, 1.0);
+}