PlatformSDL implementation.

Templates/Empty/game/shaders/common/lighting/shadowMap/shadowMapIO.h

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+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+//#define SM_Fmt_R8G8B8A8
+
+#define pkDepthBitShft 65536.0
+#define pkDepthChanMax 256.0
+#define bias -0.5/255.0
+#define coeff 0.9999991
+//#define coeff 1.0
+
+float4 encodeShadowMap( float depth )
+{
+#if defined(SM_Fmt_R8G8B8A8)   
+   return frac( float4(1.0, 255.0, 65025.0, 160581375.0) * depth ) + bias;
+
+   //float4 packedValue = frac((depth / coeff) * float4(16777216.0, 65536.0, 256.0, 1.0));
+   //return (packedValue - packedValue.xxyz * float4(0, 1.0 / 256, 1.0 / 256, 1.0 / 256));
+#else
+   return depth;
+#endif
+}
+
+float decodeShadowMap( float4 smSample )
+{
+#if defined(SM_Fmt_R8G8B8A8)
+   return dot( smSample, float4(1.0, 1/255.0, 1/65025.0, 1/160581375.0) );
+#else
+   return smSample.x;  
+#endif
+}