FaceWorks 1.0

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+//----------------------------------------------------------------------------------
+// File:        FaceWorks/samples/sample_d3d11/shaders/tonemap.hlsli
+// SDK Version: v1.0
+// Email:       [email protected]
+// Site:        http://developer.nvidia.com/
+//
+// Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of NVIDIA CORPORATION nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//----------------------------------------------------------------------------------
+
+#ifndef TONEMAP_HLSLI
+#define TONEMAP_HLSLI
+
+#include "common.hlsli"
+
+float3 Tonemap(float3 rgb)
+{
+	// Apply exposure
+	rgb *= g_exposure;
+
+	// Apply the magic Jim Hejl tonemapping curve (see:
+	// http://www.slideshare.net/ozlael/hable-john-uncharted2-hdr-lighting, slide #140)
+	static const bool useTonemapping = true;
+	if (useTonemapping)
+	{
+		rgb = max(0, rgb - 0.004);
+		rgb = (rgb * (6.2 * rgb + 0.5)) / (rgb * (6.2 * rgb + 1.7) + 0.06);
+	}
+	else
+	{
+		// Just convert to SRGB gamma space
+		rgb = (rgb < 0.0031308) ? (12.92 * rgb) : (1.055 * pow(rgb, 1.0/2.4) - 0.055);
+	}
+
+	return rgb;
+}
+
+#endif // TONEMAP_HLSLI