From 791d2955783df61150473b3f1f46a6874e43bca4 Mon Sep 17 00:00:00 2001
From: Zach Pomerantz <zach@highfidelity.io>
Date: Fri, 19 Feb 2016 11:48:44 -0800
Subject: [PATCH] Move paint shader functions to Paint.slh

---
 libraries/gpu/src/gpu/Paint.slh     | 47 +++++++++++++++++++++++++++++
 libraries/render-utils/src/grid.slf | 27 +----------------
 2 files changed, 48 insertions(+), 26 deletions(-)
 create mode 100644 libraries/gpu/src/gpu/Paint.slh

diff --git a/libraries/gpu/src/gpu/Paint.slh b/libraries/gpu/src/gpu/Paint.slh
new file mode 100644
index 0000000000..5f49b20b30
--- /dev/null
+++ b/libraries/gpu/src/gpu/Paint.slh
@@ -0,0 +1,47 @@
+<!
+//  Paint.slh
+//  libraries/gpu/src
+//
+//  Created by Zach Pomerantz on 2/19/2016.
+//  Copyright 2016 High Fidelity, Inc.
+//
+//  Fragment shader utility functions. Will fail compilation in vertex shaders.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+!>
+<@if not GPU_PAINT_SLH@>
+<@def GPU_PAINT_SLH@>
+
+float paintStripe(float value, float offset, float scale, float edge) {
+    float width = fwidth(value);
+    float normalizedWidth = width * scale;
+
+    float x0 = (value + offset) * scale - normalizedWidth / 2;
+    float x1 = x0 + normalizedWidth;
+
+    float balance = 1.0 - edge;
+    float i0 = edge * floor(x0) + max(0.0, fract(x0) - balance);
+    float i1 = edge * floor(x1) + max(0.0, fract(x1) - balance);
+    float strip = (i1 - i0) / normalizedWidth;
+
+    return clamp(strip, 0.0, 1.0);
+}
+
+float paintGrid(vec2 value, vec2 offset, vec2 scale, vec2 edge) {
+    return max(
+        paintStripe(value.x, offset.x, scale.x, edge.x),
+        paintStripe(value.y, offset.y, scale.y, edge.y));
+}
+
+float paintGridMajor(vec2 value, vec2 offset, vec2 scale, vec2 edge) {
+    return paintGrid(value, offset, scale, edge);
+}
+
+float paintGridMajorMinor(vec2 value, vec4 offset, vec4 scale, vec4 edge) {
+    return max(
+        paintGrid(value, offset.xy, scale.xy, edge.xy),
+        paintGrid(value, offset.zw, scale.zw, edge.zw));
+}
+
+<@endif@>
diff --git a/libraries/render-utils/src/grid.slf b/libraries/render-utils/src/grid.slf
index 04e35ac5ca..901d343268 100644
--- a/libraries/render-utils/src/grid.slf
+++ b/libraries/render-utils/src/grid.slf
@@ -11,32 +11,7 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-float paintStripe(float value, float offset, float scale, float edge) {
-    float width = fwidth(value);
-    float normalizedWidth = width * scale;
-
-    float x0 = (value + offset) * scale - normalizedWidth / 2;
-    float x1 = x0 + normalizedWidth;
-
-    float balance = 1.0 - edge;
-    float i0 = edge * floor(x0) + max(0.0, fract(x0) - balance);
-    float i1 = edge * floor(x1) + max(0.0, fract(x1) - balance);
-    float strip = (i1 - i0) / normalizedWidth;
-
-    return clamp(strip, 0.0, 1.0);
-}
-
-float paintGrid(vec2 value, vec2 offset, vec2 scale, vec2 edge) {
-    return max(
-        paintStripe(value.x, offset.x, scale.x, edge.x),
-        paintStripe(value.y, offset.y, scale.y, edge.y));
-}
-
-float paintGridMajorMinor(vec2 value, vec4 offset, vec4 scale, vec4 edge) {
-    return max(
-        paintGrid(value, offset.xy, scale.xy, edge.xy),
-        paintGrid(value, offset.zw, scale.zw, edge.zw));
-}
+<@include gpu/Paint.slh@>
 
 struct Grid {
     vec4 period;