From dc34aed50b5cb3840468af2591c2a0ea0f8abc29 Mon Sep 17 00:00:00 2001
From: Bernie Innocenti <codewiz@google.com>
Date: Mon, 15 Oct 2018 00:43:40 +0900
Subject: [PATCH] Use GLSL 3.0 ES for all shaders

---
 shaders/mandelwow.frag | 17 +++++++++--------
 shaders/mandelwow.vert |  9 +++++----
 shaders/text.frag      |  2 +-
 shaders/text.vert      |  2 +-
 4 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/shaders/mandelwow.frag b/shaders/mandelwow.frag
index 0551a34..8107b3d 100644
--- a/shaders/mandelwow.frag
+++ b/shaders/mandelwow.frag
@@ -1,7 +1,8 @@
-#version 100
+#version 300 es
 precision highp float;
-varying vec2 c;
-varying vec2 z;
+in vec2 c;
+in vec2 z;
+out vec4 color;
 
 void main() {
     float zx = z.x;
@@ -12,14 +13,14 @@ void main() {
         float zy2 = zy * zy;
         if (zx2 * zy2 > 4.0) {
           float index = float(iter) / float(maxiter);
-          gl_FragColor = vec4(index, 0.1, 1.0 - index / 2.0, 0.8 - index * index);
+          color = vec4(index, 0.1, 1.0 - index / 2.0, 0.8 - index * index);
           return;
         }
         zy = zx * zy * 2.0 + c.y;
         zx = zx2 - zy2 + c.x;
     }
-    gl_FragColor = vec4((sin(z.y) + 1.0) / 4.0,
-                        (sin(z.x) + 1.0) / 4.0,
-                        (sin(c.x) + 1.0) / 4.0,
-                        1.0);
+    color = vec4((sin(z.y) + 1.0) / 4.0,
+                 (sin(z.x) + 1.0) / 4.0,
+                 (sin(c.x) + 1.0) / 4.0,
+                 1.0);
 }
diff --git a/shaders/mandelwow.vert b/shaders/mandelwow.vert
index 0e67eda..b7556a7 100644
--- a/shaders/mandelwow.vert
+++ b/shaders/mandelwow.vert
@@ -1,11 +1,12 @@
-#version 100
+#version 300 es
+precision lowp float;
 uniform mat4 perspective;
 uniform mat4 view;
 uniform mat4 model;
 uniform vec2 z0;
-attribute mediump vec3 position;
-varying mediump vec2 c;
-varying mediump vec2 z;
+in vec3 position;
+out vec2 c;
+out vec2 z;
 
 void main() {
     mat4 modelview = view * model;
diff --git a/shaders/text.frag b/shaders/text.frag
index ab43bfe..3df3010 100644
--- a/shaders/text.frag
+++ b/shaders/text.frag
@@ -1,4 +1,4 @@
-#version 140
+#version 300 es
 uniform sampler2D tex;
 uniform vec4 bgcolor;
 uniform vec4 fgcolor;
diff --git a/shaders/text.vert b/shaders/text.vert
index e3544f7..90e0b9f 100644
--- a/shaders/text.vert
+++ b/shaders/text.vert
@@ -1,4 +1,4 @@
-#version 140
+#version 300 es
 
 uniform mat4 model;
 uniform mat4 perspview;
-- 
2.25.1