Fix sun making everything transperent

and sun has beautiful gradient

shaders/sun.fs

@@ -0,0 +1,28 @@
+#version 330
+
+in vec2 fragTexCoord;
+in vec4 fragColor;
+out vec4 finalColor;
+
+uniform vec3 color;
+uniform float sun_radius;
+uniform float start_transperency;
+vec2 offset = vec2(1.0f, 1.0f);
+float sun_end = 1.0f;
+
+void main()
+{
+    offset.x -= fragTexCoord.x * 2;
+    offset.y -= fragTexCoord.y * 2;
+    float radius = length(offset);
+    if(radius < sun_radius){
+        finalColor = vec4(color, 1.0f);
+    }else if(radius < sun_end){
+        float gradient = radius;
+        gradient -= sun_radius;
+        gradient = gradient / (sun_end - sun_radius) * start_transperency;
+        finalColor = vec4(color, start_transperency - gradient);
+    }else{
+        finalColor = vec4(color, 0.0f);
+    }
+}