From 93b0308b1de9672990f5bd3873aa2e9631dee7cc Mon Sep 17 00:00:00 2001
From: Pete Feltham <dev@felthy.com>
Date: Tue, 14 Nov 2017 21:55:59 +1100
Subject: [PATCH 1/2] Add a blue.glsl fragment shader to get the visual tests
 working

---
 test/visual/.gitignore | 1 +
 test/visual/blue.glsl  | 5 +++++
 2 files changed, 6 insertions(+)
 create mode 100644 test/visual/blue.glsl

diff --git a/test/visual/.gitignore b/test/visual/.gitignore
index 67e6103..d2c1aeb 100644
--- a/test/visual/.gitignore
+++ b/test/visual/.gitignore
@@ -1,3 +1,4 @@
 *.glsl
 !_base.glsl
 !frag.glsl
+!blue.glsl
diff --git a/test/visual/blue.glsl b/test/visual/blue.glsl
new file mode 100644
index 0000000..2ce7e2e
--- /dev/null
+++ b/test/visual/blue.glsl
@@ -0,0 +1,5 @@
+precision mediump float;
+
+void main() {
+  gl_FragColor = vec4(0.2, 0.6, 0.9, 1.0);
+}

From 9523fc431f41e9bf441a2c83d9106baa9b4f4149 Mon Sep 17 00:00:00 2001
From: Pete Feltham <dev@felthy.com>
Date: Tue, 14 Nov 2017 22:11:26 +1100
Subject: [PATCH 2/2] Adjust use of pow(x,y) such that x is never less than
 zero

---
 cubic-in-out.glsl   | 2 +-
 quartic-in-out.glsl | 2 +-
 quartic-out.glsl    | 2 +-
 quintic-in-out.glsl | 2 +-
 quintic-out.glsl    | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/cubic-in-out.glsl b/cubic-in-out.glsl
index 32ce665..8c5defa 100644
--- a/cubic-in-out.glsl
+++ b/cubic-in-out.glsl
@@ -1,7 +1,7 @@
 float cubicInOut(float t) {
   return t < 0.5
     ? 4.0 * t * t * t
-    : 0.5 * pow(2.0 * t - 2.0, 3.0) + 1.0;
+    : 0.5 * -pow(2.0 - 2.0 * t, 3.0) + 1.0;
 }
 
 #pragma glslify: export(cubicInOut)
diff --git a/quartic-in-out.glsl b/quartic-in-out.glsl
index 094ab67..bc026ff 100644
--- a/quartic-in-out.glsl
+++ b/quartic-in-out.glsl
@@ -1,7 +1,7 @@
 float quarticInOut(float t) {
   return t < 0.5
     ? +8.0 * pow(t, 4.0)
-    : -8.0 * pow(t - 1.0, 4.0) + 1.0;
+    : -8.0 * pow(1.0 - t, 4.0) + 1.0;
 }
 
 #pragma glslify: export(quarticInOut)
diff --git a/quartic-out.glsl b/quartic-out.glsl
index d488d34..68b830d 100644
--- a/quartic-out.glsl
+++ b/quartic-out.glsl
@@ -1,5 +1,5 @@
 float quarticOut(float t) {
-  return pow(t - 1.0, 3.0) * (1.0 - t) + 1.0;
+  return pow(1.0 - t, 3.0) * (t - 1.0) + 1.0;
 }
 
 #pragma glslify: export(quarticOut)
diff --git a/quintic-in-out.glsl b/quintic-in-out.glsl
index 6c9c505..85178c3 100644
--- a/quintic-in-out.glsl
+++ b/quintic-in-out.glsl
@@ -1,7 +1,7 @@
 float qinticInOut(float t) {
   return t < 0.5
     ? +16.0 * pow(t, 5.0)
-    : -0.5 * pow(2.0 * t - 2.0, 5.0) + 1.0;
+    : -0.5 * pow(2.0 - 2.0 * t, 5.0) + 1.0;
 }
 
 #pragma glslify: export(qinticInOut)
diff --git a/quintic-out.glsl b/quintic-out.glsl
index 5e9e946..108bfb6 100644
--- a/quintic-out.glsl
+++ b/quintic-out.glsl
@@ -1,5 +1,5 @@
 float qinticOut(float t) {
-  return 1.0 - (pow(t - 1.0, 5.0));
+  return 1.0 - pow(1.0 - t, 5.0);
 }
 
 #pragma glslify: export(qinticOut)