From 9b746df06447e716d13f16675eecdd001dbec397 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mart=C3=ADn=20Lucas=20Golini?= <spartanj@gmail.com>
Date: Thu, 10 Jan 2013 01:57:56 -0300
Subject: [PATCH] Added a little optimization of the external_shader demo for
 ARM.

---
 projects/linux/ee.creator.user                 |  6 +++---
 .../external_shader/external_shader.cpp        | 18 +++++++++++++++++-
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/projects/linux/ee.creator.user b/projects/linux/ee.creator.user
index 990d22ed6..c0914e0ef 100644
--- a/projects/linux/ee.creator.user
+++ b/projects/linux/ee.creator.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by Qt Creator 2.6.1, 2013-01-10T01:20:01. -->
+<!-- Written by Qt Creator 2.6.1, 2013-01-10T01:57:20. -->
 <qtcreator>
  <data>
   <variable>ProjectExplorer.Project.ActiveTarget</variable>
@@ -48,9 +48,9 @@
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Desktop</value>
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Desktop</value>
    <value type="QByteArray" key="ProjectExplorer.ProjectConfiguration.Id">{388e5431-b31b-42b3-b9ad-9002d279d75d}</value>
-   <value type="int" key="ProjectExplorer.Target.ActiveBuildConfiguration">10</value>
+   <value type="int" key="ProjectExplorer.Target.ActiveBuildConfiguration">8</value>
    <value type="int" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
-   <value type="int" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
+   <value type="int" key="ProjectExplorer.Target.ActiveRunConfiguration">4</value>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.0">
     <value type="QString" key="GenericProjectManager.GenericBuildConfiguration.BuildDirectory">/home/programming/eepp/make/linux</value>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
diff --git a/src/examples/external_shader/external_shader.cpp b/src/examples/external_shader/external_shader.cpp
index 8a90b5b3a..a3ba8057e 100644
--- a/src/examples/external_shader/external_shader.cpp
+++ b/src/examples/external_shader/external_shader.cpp
@@ -144,6 +144,16 @@ EE_MAIN_FUNC int main (int argc, char * argv [])
 			colors[i]		= eeColorAf( Math::Randf() * 0.5, 0.1, 0.8, 0.5 );
 		}
 
+		/** Optimized for ARM ( pre-cache sqrt ) */
+		#ifdef EE_ARM
+		static eeFloat sqrt_aprox[20001];
+		eeFloat tFloat = 0;
+		for ( int i = 0; i <= 20000; i++ ) {
+			sqrt_aprox[i] = eesqrt( tFloat );
+			tFloat += 0.001;
+		}
+		#endif
+
 		while ( win->Running() )
 		{
 			imp->Update();
@@ -209,7 +219,13 @@ EE_MAIN_FUNC int main (int argc, char * argv [])
 				if ( touch ) {
 					eeFloat dx	= touchX - vertices[i].x;
 					eeFloat dy	= touchY - vertices[i].y;
-					eeFloat d	= eesqrt( dx * dx + dy * dy );
+					eeFloat distance = dx * dx + dy * dy;
+
+					#ifndef EE_ARM
+					eeFloat d	= eesqrt( distance );
+					#else
+					eeFloat d = sqrt_aprox[ (Int32)(distance * 1000) ];
+					#endif
 
 					if ( d < 2.f ) {
 						if ( d < 0.03f ) {