big refactor

shaders/vignette.fs

@@ -0,0 +1,19 @@
+#version 330
+
+uniform sampler2D texture0;
+uniform vec2 resolution;
+uniform float strength;
+
+in vec2 fragTexCoord;
+out vec4 finalColor;
+
+void main()
+{
+    vec2 uv = fragTexCoord;
+    vec2 position = uv - vec2(0.5);
+    float dist = length(position) * 2.0;  
+    float vignette = 1.0 - strength * dist * dist;
+    vignette = clamp(vignette, 0.0, 1.0);
+    vec4 color = texture(texture0, uv);
+    finalColor = vec4(color.rgb * vignette, color.a);
+}