From e1f7cbaa1d6914f9e1a78f73633c8b24e13ed11b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Ortega=20Froysa?=
 <nortega@themusicinnoise.net>
Date: Thu, 25 Oct 2018 23:00:26 +0200
Subject: [PATCH] Optimize color changing with OpenMP.

---
 CMakeLists.txt | 3 ++-
 src/cube.cpp   | 1 +
 src/cube.hpp   | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94ecca2..b8ecfd8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,7 @@ set(OpenGL_GL_PREFERENCE "GLVND")
 find_package(OpenGL REQUIRED)
 find_package(GLUT REQUIRED)
 find_package(GLEW REQUIRED)
+find_package(OpenMP REQUIRED)
 find_package(PkgConfig REQUIRED)
 pkg_search_module(SDL2 REQUIRED sdl2)
 
@@ -54,7 +55,7 @@ set(SRCS
 	"src/simulation.cpp")
 
 # Define C++ compiler flags
-set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Wextra -Wpedantic -Wfatal-errors -Werror -pedantic-errors -fno-elide-constructors")
+set(CMAKE_CXX_FLAGS "-std=c++11 ${OpenMP_CXX_FLAGS} -Wall -Wextra -Wpedantic -Wfatal-errors -Werror -pedantic-errors -fno-elide-constructors")
 set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-g -O3")
diff --git a/src/cube.cpp b/src/cube.cpp
index 8bc6860..68ea0ae 100644
--- a/src/cube.cpp
+++ b/src/cube.cpp
@@ -84,6 +84,7 @@ void cube::render() {
 }
 
 void cube::shift_colors() {
+	#pragma omp parallel for
 	for(size_t i = 0; i < colors.size(); ++i)
 	{
 		colors[i] += color_ascending[i] ? color_shift :
diff --git a/src/cube.hpp b/src/cube.hpp
index eb54c48..316226a 100644
--- a/src/cube.hpp
+++ b/src/cube.hpp
@@ -36,7 +36,7 @@ public:
 	void render();
 
 private:
-	const float color_shift = 0.0001;
+	const float color_shift = 0.005;
 	void shift_colors();
 
 	// OpenGL buffers