update resources

resources/shaders/110/silhouette_composite.fs

@@ -0,0 +1,57 @@
+#version 110
+uniform sampler2D u_sampler;
+uniform mat3 u_convolution_matrix;
+uniform vec3 u_viewport_size_alpha;
+uniform vec3 u_picking_color;
+varying vec2 tex_coords;
+
+vec4 sample(float offsetX, float offsetY)
+{
+    return texture2D(u_sampler, vec2(tex_coords.x + offsetX, tex_coords.y + offsetY));
+}
+
+// see https://docs.gl/sl4/sign
+// glsl 110 & 120 may not support the sign func
+float sign_glsl_110(float value)
+{
+    if (value > 1e-6) {
+        return 1.0;
+    }
+    else if (value < -1e-6) {
+        return -1.0;
+    }
+    return 0.0;
+}
+
+void main()
+{
+    vec4 pixels[9];
+    float deltaWidth = 1.0 / u_viewport_size_alpha.x;
+    float deltaHeight = 1.0 / u_viewport_size_alpha.y;
+    float alpha = u_viewport_size_alpha.z;
+    float effect_width = 2.0;
+    deltaWidth = deltaWidth * effect_width;
+    deltaHeight = deltaHeight * effect_width;
+    pixels[0] = sample(-deltaWidth, deltaHeight );
+    pixels[1] = sample(0.0, deltaHeight );
+    pixels[2] = sample(deltaWidth, deltaHeight );
+    pixels[3] = sample(-deltaWidth, 0.0);
+    pixels[4] = sample(0.0, 0.0);
+    pixels[5] = sample(deltaWidth, 0.0);
+    pixels[6] = sample(-deltaWidth, -deltaHeight);
+    pixels[7] = sample(0.0, -deltaHeight);
+    pixels[8] = sample(deltaWidth, -deltaHeight);
+    vec4 accumulator = vec4(0.0);
+    for (int i = 0; i < 3; i++)
+    {
+        for (int j = 0; j < 3; ++j)
+        {
+            accumulator += sign_glsl_110(pixels[3 * i + j].a) * vec4(u_picking_color, 1.0) * u_convolution_matrix[i][j];
+        }
+    }
+
+    if ((abs(accumulator.a) - alpha * pixels[4].a) * 1e6 > 1.0) {
+        accumulator = vec4(u_picking_color, abs(accumulator.a));
+    }
+    gl_FragColor = accumulator;
+}