Add small scale for color grading LUT

Content/Shaders/ColorGrading.flax

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c0b43b79fe3ad34ebf5fa47d49e017c768b48c1bd688ba521a684bab7ef286bd
-size 12311
+oid sha256:0a7c3aef4378698c6875a7574ec17890d88e87013242e5f8327cc72050bfda8b
+size 12377

Content/Shaders/PostProcessing.flax

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:eb59d5d69de414b28dad32c673193d138709c16bd31bb8a1cf435d329a6bd1c1
-size 22997
+oid sha256:a430a05bdfa8476cc742748d5406e9c8c80a7e1ed00f392947b8c88cdf7cd176
+size 23062

Source/Shaders/ColorGrading.shader

@@ -281,8 +281,11 @@ float4 CombineLUTs(float2 uv, uint layerIndex)
 #endif
 
 	// Move from encoded LUT color space to linear color
-	//float3 linearColor = encodedColor.rgb; // Default
+#if COLOR_GRADING_LUT_LOG
 	float3 linearColor = LogToLinear(encodedColor.rgb) - LogToLinear(0); // Log
+#else
+	float3 linearColor = encodedColor.rgb; // Default
+#endif
 
 	// Apply white balance
 	linearColor = WhiteBalance(linearColor);
@@ -300,7 +303,7 @@ float4 CombineLUTs(float2 uv, uint layerIndex)
 		color = lerp(color, lutColor, LutWeight);
 	}
 
-	return float4(color, 1);
+	return float4(color / COLOR_GRADING_LUT_SCALE, 1);
 }
 
 // Vertex shader that writes to a range of slices of a volume texture

Source/Shaders/GammaCorrectionCommon.hlsl

@@ -5,6 +5,10 @@
 
 #include "./Flax/Math.hlsl"
 
+// Shared configs for Color Grading LUT
+#define COLOR_GRADING_LUT_LOG 1
+#define COLOR_GRADING_LUT_SCALE 1.04f
+
 // Fast reversible tonemapper
 // http://gpuopen.com/optimized-reversible-tonemapper-for-resolve/
 float3 FastTonemap(float3 c)

Source/Shaders/PostProcessing.shader

@@ -115,18 +115,20 @@ static const float LUTSize = 32;
 half3 ColorLookupTable(half3 linearColor)
 {
 	// Move from linear color to encoded LUT color space
-	//float3 encodedColor = linearColor; // Default
+#if COLOR_GRADING_LUT_LOG
 	float3 encodedColor = LinearToLog(linearColor + LogToLinear(0)); // Log
+#else
+	float3 encodedColor = linearColor; // Default
+#endif
 
 	float3 uvw = encodedColor * ((LUTSize - 1) / LUTSize) + (0.5f / LUTSize);
-
 #if USE_VOLUME_LUT
 	half3 color = ColorGradingLUT.Sample(SamplerLinearClamp, uvw).rgb;
 #else
 	half3 color = SampleUnwrappedTexture3D(ColorGradingLUT, SamplerLinearClamp, uvw, LUTSize).rgb;
 #endif
 
-	return color;
+	return color * COLOR_GRADING_LUT_SCALE;
 }
 
 // A random texture generator