1 files changed, 29 insertions, 0 deletions
diff --git a/src/quick/scenegraph/shaders/loqsubpixeldistancefieldtext_core.vert b/src/quick/scenegraph/shaders/loqsubpixeldistancefieldtext_core.vert
new file mode 100644
index 0000000000..b887a70001
--- /dev/null
+++ b/src/quick/scenegraph/shaders/loqsubpixeldistancefieldtext_core.vert
@@ -0,0 +1,29 @@
+#version 150 core
+
+in vec4 vCoord;
+in vec2 tCoord;
+
+out vec3 sampleNearLeft;
+out vec3 sampleNearRight;
+
+uniform mat4 matrix;
+uniform vec2 textureScale;
+uniform float fontScale;
+uniform vec4 vecDelta;
+
+void main()
+{
+    vec2 sampleCoord = tCoord * textureScale;
+    gl_Position = matrix * vCoord;
+
+    // Calculate neighbor pixel position in item space.
+    vec3 wDelta = gl_Position.w * vecDelta.xyw;
+    vec3 nearLeft = vCoord.xyw - 0.25 * wDelta;
+    vec3 nearRight = vCoord.xyw + 0.25 * wDelta;
+
+    // Calculate neighbor texture coordinate.
+    vec2 scale = textureScale / fontScale;
+    vec2 base = sampleCoord - scale * vCoord.xy;
+    sampleNearLeft = vec3(base * nearLeft.z + scale * nearLeft.xy, nearLeft.z);
+    sampleNearRight = vec3(base * nearRight.z + scale * nearRight.xy, nearRight.z);
+}
+\ No newline at end of file