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diff --git a/source/blender/render/intern/include/sunsky.h b/source/blender/render/intern/include/sunsky.h
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+++ b/source/blender/render/intern/include/sunsky.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): zaghaghi
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/render/intern/include/sunsky.h
+ *  \ingroup render
+ */
+
+#ifndef __SUNSKY_H__
+#define __SUNSKY_H__
+
+// #define SPECTRUM_MAX_COMPONENTS     100
+
+typedef struct SunSky {
+	short effect_type, skyblendtype, sky_colorspace;
+	float turbidity;
+	float theta, phi;
+
+	float toSun[3];
+
+	/*float sunSpectralRaddata[SPECTRUM_MAX_COMPONENTS];*/
+	float sunSolidAngle;
+
+	float zenith_Y, zenith_x, zenith_y;
+
+	float perez_Y[5], perez_x[5], perez_y[5];
+
+	/* suggested by glome in patch [#8063] */
+	float horizon_brightness;
+	float spread;
+	float sun_brightness;
+	float sun_size;
+	float backscattered_light;
+	float skyblendfac;
+	float sky_exposure;
+
+	float atm_HGg;
+
+	float atm_SunIntensity;
+	float atm_InscatteringMultiplier;
+	float atm_ExtinctionMultiplier;
+	float atm_BetaRayMultiplier;
+	float atm_BetaMieMultiplier;
+	float atm_DistanceMultiplier;
+
+	float atm_BetaRay[3];
+	float atm_BetaDashRay[3];
+	float atm_BetaMie[3];
+	float atm_BetaDashMie[3];
+	float atm_BetaRM[3];
+} SunSky;
+
+void InitSunSky(struct SunSky *sunsky, float turb, const float toSun[3], float horizon_brightness,
+                float spread, float sun_brightness, float sun_size, float back_scatter,
+                float skyblendfac, short skyblendtype, float sky_exposure, float sky_colorspace);
+
+void GetSkyXYZRadiance(struct SunSky *sunsky, float theta, float phi, float color_out[3]);
+void GetSkyXYZRadiancef(struct SunSky *sunsky, const float varg[3], float color_out[3]);
+void InitAtmosphere(struct SunSky *sunSky, float sun_intens, float mief, float rayf, float inscattf, float extincf, float disf);
+void AtmospherePixleShader(struct SunSky *sunSky, float view[3], float s, float rgb[3]);
+void ClipColor(float c[3]);
+
+#endif /*__SUNSKY_H__*/