Added selection outline✍️

Resources/Shaders/combine.shader

@@ -27,5 +27,12 @@ void main()
     vec4 a = texture(u_Source, UV);
     vec4 b = texture(u_Source2, UV);
 
-    FragColor = vec4(vec3(a.rgb + (b.rgb) / 2.0), a.a);
+    if(b.a < 0.1f)
+    {
+        FragColor = a;
+    }
+    else
+    {
+        FragColor = vec4(vec3(a.rgb + (b.rgb) / 2.0), a.a);
+    }
 }

Resources/Shaders/outline.shader

@@ -0,0 +1,56 @@
+#shader vertex
+#version 440 core
+
+layout(location = 0) in vec3 VertexPosition;
+layout(location = 1) in vec2 UVPosition;
+
+out flat vec2 a_UV;
+
+void main()
+{
+	a_UV = UVPosition;
+	gl_Position = vec4(VertexPosition, 1.0f);
+}
+
+#shader fragment
+#version 440 core
+
+uniform int u_EntityID;
+uniform usampler2D u_EntityTexture;
+uniform vec4 u_OutlineColor;
+
+out vec4 FragColor;
+
+in vec2 a_UV;
+
+void main()
+{
+    int target = u_EntityID;
+    const float TAU = 6.28318530;
+	const float steps = 32.0;
+    
+	float radius = 4.f;
+	vec2 uv = a_UV;
+    
+    // Correct aspect ratio
+    vec2 aspect = 1.0 / vec2(textureSize(u_EntityTexture, 0));
+    
+	vec4 fragColor = vec4(0.0, 0.0, 0.0, 0.0f);
+	for (float i = 0.0; i < TAU; i += TAU / steps) 
+    {
+		// Sample image in a circular pattern
+        vec2 offset = vec2(sin(i), cos(i)) * aspect * radius;
+		uint col = texture(u_EntityTexture, uv + offset).r;
+		
+		// Mix outline with background
+		float alpha = smoothstep(0.5, 0.7, int(col != target) * 10.0f);
+		fragColor = mix(fragColor, u_OutlineColor, alpha);
+	}
+	
+    if(fragColor.a > 0.1)
+    {
+        fragColor.a = 1.0f;
+    }
+    
+    FragColor = mix(vec4(0), fragColor, texture(u_EntityTexture, uv).r == target);
+}