From 6c71334cdac01d82710494c7b247b69fa5f1c099 Mon Sep 17 00:00:00 2001
From: vlj <vljn@ovi.com>
Date: Mon, 4 Aug 2014 01:12:45 +0200
Subject: [PATCH] Only calculate diffuse coefficient once.

---
 src/graphics/irr_driver.cpp    | 2 ++
 src/graphics/irr_driver.hpp    | 1 +
 src/graphics/render_skybox.cpp | 3 +++
 3 files changed, 6 insertions(+)

diff --git a/src/graphics/irr_driver.cpp b/src/graphics/irr_driver.cpp
index 6fde23249..6808684f1 100644
--- a/src/graphics/irr_driver.cpp
+++ b/src/graphics/irr_driver.cpp
@@ -1204,6 +1204,7 @@ scene::ISceneNode *IrrDriver::addSkyBox(const std::vector<video::ITexture*> &tex
     SkyboxTextures = texture;
     SphericalHarmonicsTextures = sphericalHarmonics;
     SkyboxCubeMap = 0;
+    m_SH_dirty = true;
     return m_scene_manager->addSkyBoxSceneNode(texture[0], texture[1],
                                                texture[2], texture[3],
                                                texture[4], texture[5]);
@@ -1213,6 +1214,7 @@ void IrrDriver::suppressSkyBox()
 {
     SkyboxTextures.clear();
     SphericalHarmonicsTextures.clear();
+    m_SH_dirty = true;
     if ((SkyboxCubeMap) && (!ProfileWorld::isNoGraphics()))
         glDeleteTextures(1, &SkyboxCubeMap);
     SkyboxCubeMap = 0;
diff --git a/src/graphics/irr_driver.hpp b/src/graphics/irr_driver.hpp
index b41190555..8118f0948 100644
--- a/src/graphics/irr_driver.hpp
+++ b/src/graphics/irr_driver.hpp
@@ -233,6 +233,7 @@ private:
 
     std::vector<video::ITexture *> SkyboxTextures;
     std::vector<video::ITexture *> SphericalHarmonicsTextures;
+    bool m_SH_dirty;
 
     float blueSHCoeff[9];
     float greenSHCoeff[9];
diff --git a/src/graphics/render_skybox.cpp b/src/graphics/render_skybox.cpp
index ec9e4720d..599251fac 100644
--- a/src/graphics/render_skybox.cpp
+++ b/src/graphics/render_skybox.cpp
@@ -437,6 +437,9 @@ void IrrDriver::generateSkyboxCubemap()
 
 void IrrDriver::generateDiffuseCoefficients()
 {
+    if (!m_SH_dirty)
+        return;
+    m_SH_dirty = false;
     const unsigned texture_permutation[] = { 2, 3, 0, 1, 5, 4 };
 
     if (SphericalHarmonicsTextures.size() == 6)