From ca5a8a81a2429c077c7b6e3344e79dd1df86f6fc Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 26 Sep 2017 10:57:09 +0100
Subject: [PATCH] Updated wiht OpenSceneGraph-Data/shader version that
 introduced use of textureLOD to reduce aliasing artifacts with SDF

---
 src/osgText/shaders/text_sdf_frag.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/osgText/shaders/text_sdf_frag.cpp b/src/osgText/shaders/text_sdf_frag.cpp
index c357073e0..9f32c1e9a 100644
--- a/src/osgText/shaders/text_sdf_frag.cpp
+++ b/src/osgText/shaders/text_sdf_frag.cpp
@@ -25,9 +25,11 @@ char text_sdf_frag[] = "$OSG_GLSL_VERSION\n"
                        "\n"
                        "#if __VERSION__>=130\n"
                        "    #define TEXTURE texture\n"
+                       "    #define TEXTURELOD textureLod\n"
                        "    out vec4 osg_FragColor;\n"
                        "#else\n"
                        "    #define TEXTURE texture2D\n"
+                       "    #define TEXTURELOD texture2DLod\n"
                        "    #define osg_FragColor gl_FragColor\n"
                        "#endif\n"
                        "\n"
@@ -68,7 +70,7 @@ char text_sdf_frag[] = "$OSG_GLSL_VERSION\n"
                        "#ifdef SIGNED_DISTNACE_FIELD_SUPPORTED\n"
                        "vec4 distanceFieldColor()\n"
                        "{\n"
-                       "    float center_alpha = TEXTURE(glyphTexture, texCoord).r;\n"
+                       "    float center_alpha = TEXTURELOD(glyphTexture, texCoord, 0.0).r;\n"
                        "\n"
                        "    float blend_width = 0.005;\n"
                        "    float distance_scale = 0.25;\n"