Revert "Removed unneeded shader duplication."

USL-32

This breaks the OpenGL shaders on Windows and Mac.

plugins/LayerView/layerview_composite.shader

@@ -64,6 +64,75 @@ fragment =
         }
     }
 
+vertex41core =
+    #version 410
+    uniform highp mat4 u_modelViewProjectionMatrix;
+    in highp vec4 a_vertex;
+    in highp vec2 a_uvs;
+
+    out highp vec2 v_uvs;
+
+    void main()
+    {
+        gl_Position = u_modelViewProjectionMatrix * a_vertex;
+        v_uvs = a_uvs;
+    }
+
+fragment41core =
+    #version 410
+    uniform sampler2D u_layer0;
+    uniform sampler2D u_layer1;
+    uniform sampler2D u_layer2;
+
+    uniform vec2 u_offset[9];
+
+    uniform vec4 u_background_color;
+    uniform float u_outline_strength;
+    uniform vec4 u_outline_color;
+
+    in vec2 v_uvs;
+
+    float kernel[9];
+
+    const vec3 x_axis = vec3(1.0, 0.0, 0.0);
+    const vec3 y_axis = vec3(0.0, 1.0, 0.0);
+    const vec3 z_axis = vec3(0.0, 0.0, 1.0);
+
+    out vec4 frag_color;
+
+    void main()
+    {
+        // blur kernel
+        kernel[0] = 0.0; kernel[1] = 1.0; kernel[2] = 0.0;
+        kernel[3] = 1.0; kernel[4] = -4.0; kernel[5] = 1.0;
+        kernel[6] = 0.0; kernel[7] = 1.0; kernel[8] = 0.0;
+
+        vec4 result = u_background_color;
+
+        vec4 main_layer = texture(u_layer0, v_uvs);
+        vec4 selection_layer = texture(u_layer1, v_uvs);
+        vec4 layerview_layer = texture(u_layer2, v_uvs);
+
+        result = main_layer * main_layer.a + result * (1.0 - main_layer.a);
+        result = layerview_layer * layerview_layer.a + result * (1.0 - layerview_layer.a);
+
+        vec4 sum = vec4(0.0);
+        for (int i = 0; i < 9; i++)
+        {
+            vec4 color = vec4(texture(u_layer1, v_uvs.xy + u_offset[i]).a);
+            sum += color * (kernel[i] / u_outline_strength);
+        }
+
+        if((selection_layer.rgb == x_axis || selection_layer.rgb == y_axis || selection_layer.rgb == z_axis))
+        {
+            frag_color = result;
+        }
+        else
+        {
+            frag_color = mix(result, u_outline_color, abs(sum.a));
+        }
+    }
+
 [defaults]
 u_layer0 = 0
 u_layer1 = 1