1 files changed, 45 insertions, 0 deletions
diff --git a/source/blender/draw/modes/shaders/object_outline_expand_frag.glsl b/source/blender/draw/modes/shaders/object_outline_expand_frag.glsl
new file mode 100644
index 00000000000..e0568d1157a
--- /dev/null
+++ b/source/blender/draw/modes/shaders/object_outline_expand_frag.glsl
@@ -0,0 +1,45 @@
+
+in vec4 uvcoordsvar;
+
+out vec4 FragColor;
+
+uniform sampler2D outlineColor;
+uniform sampler2D outlineDepth;
+
+uniform float alpha;
+uniform bool doExpand;
+
+void search_outline(ivec2 uv, inout bool found_edge)
+{
+	if (!found_edge) {
+		vec4 color = texelFetch(outlineColor, uv, 0).rgba;
+		if (color.a != 0.0) {
+			if (doExpand || color.a != 1.0) {
+				FragColor = color;
+				found_edge = true;
+			}
+		}
+	}
+}
+
+void main()
+{
+	ivec2 uv = ivec2(gl_FragCoord.xy);
+	FragColor = texelFetch(outlineColor, uv, 0).rgba;
+	float depth = texelFetch(outlineDepth, uv, 0).r;
+
+	if (FragColor.a != 0.0 || (depth == 1.0 && !doExpand))
+		return;
+
+	bool found_edge = false;
+	search_outline(uv + ivec2( 1,  0), found_edge);
+	search_outline(uv + ivec2( 0,  1), found_edge);
+	search_outline(uv + ivec2(-1,  0), found_edge);
+	search_outline(uv + ivec2( 0, -1), found_edge);
+
+	/* We Hit something ! */
+	if (found_edge) {
+		/* only change alpha */
+		FragColor.a *= alpha;
+	}
+}