1 files changed, 37 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..7e288cde236
--- /dev/null
+++ b/source/blender/draw/modes/shaders/object_outline_expand_frag.glsl
@@ -0,0 +1,37 @@
+
+in vec4 uvcoordsvar;
+
+out vec4 FragColor;
+
+uniform sampler2D outlineColor;
+
+uniform float alpha;
+uniform bool doExpand;
+
+void main()
+{
+	ivec2 uv = ivec2(gl_FragCoord.xy);
+	FragColor = texelFetch(outlineColor, uv, 0).rgba;
+
+	vec4 color[4];
+	color[0] = texelFetchOffset(outlineColor, uv, 0, ivec2( 1,  0)).rgba;
+	color[1] = texelFetchOffset(outlineColor, uv, 0, ivec2( 0,  1)).rgba;
+	color[2] = texelFetchOffset(outlineColor, uv, 0, ivec2(-1,  0)).rgba;
+	color[3] = texelFetchOffset(outlineColor, uv, 0, ivec2( 0, -1)).rgba;
+
+	vec4 values = vec4(color[0].a, color[1].a, color[2].a, color[3].a);
+
+	vec4 tests = step(vec4(1e-6), values); /* (color.a != 0.0) */
+	bvec4 btests = equal(tests, vec4(1.0));
+
+	if (FragColor.a != 0.0) {
+		return;
+	}
+
+	FragColor = (btests.x) ? color[0] : FragColor;
+	FragColor = (btests.y) ? color[1] : FragColor;
+	FragColor = (btests.z) ? color[2] : FragColor;
+	FragColor = (btests.w) ? color[3] : FragColor;
+
+	FragColor.a *= (!doExpand) ? 0.0 : 1.0;
+}