motion blur fix when delta time is zero

WickedEngine/shaders/motionblurCS.hlsl

@@ -63,7 +63,7 @@ void main(uint3 Gid : SV_GroupID, uint3 GTid : SV_GroupThreadID)
 
 #else
 
-	const float strength = motionblur_strength / GetFrame().delta_time;
+	const float strength = motionblur_strength;
 
 	const float2 neighborhood_velocity = neighborhoodmax[(pixel + (dither((float2)pixel) - 0.5f) * 16) / MOTIONBLUR_TILESIZE] * strength; // dither to reduce tile artifact
 	const float neighborhood_velocity_magnitude = length(neighborhood_velocity);

WickedEngine/wiRenderPath3D.cpp

@@ -2363,6 +2363,7 @@ namespace wi
 			if (getMotionBlurEnabled() && getMotionBlurStrength() > 0 && motionblurResources.IsValid())
 			{
 				wi::renderer::Postprocess_MotionBlur(
+					scene->dt,
 					motionblurResources,
 					rt_first == nullptr ? *rt_read : *rt_first,
 					*rt_write,

WickedEngine/wiRenderer.cpp

@@ -15601,6 +15601,7 @@ void CreateMotionBlurResources(MotionBlurResources& res, XMUINT2 resolution)
 	device->CreateBuffer(&bufferdesc, nullptr, &res.buffer_tiles_expensive);
 }
 void Postprocess_MotionBlur(
+	float dt,
 	const MotionBlurResources& res,
 	const Texture& input,
 	const Texture& output,
@@ -15661,7 +15662,7 @@ void Postprocess_MotionBlur(
 	postprocess.resolution.y = desc.height;
 	postprocess.resolution_rcp.x = 1.0f / postprocess.resolution.x;
 	postprocess.resolution_rcp.y = 1.0f / postprocess.resolution.y;
-	motionblur_strength = strength / 60.0f; // align to shutter speed
+	motionblur_strength = dt > 0 ? (strength / 60.0f / dt) : 0; // align to shutter speed
 
 	// Compute tile max velocities (horizontal):
 	{

WickedEngine/wiRenderer.h

@@ -741,6 +741,7 @@ namespace wi::renderer
 	};
 	void CreateMotionBlurResources(MotionBlurResources& res, XMUINT2 resolution);
 	void Postprocess_MotionBlur(
+		float dt, // delta time in seconds
 		const MotionBlurResources& res,
 		const wi::graphics::Texture& input,
 		const wi::graphics::Texture& output,

WickedEngine/wiVersion.cpp

@@ -9,7 +9,7 @@ namespace wi::version
 	// minor features, major updates, breaking compatibility changes
 	const int minor = 71;
 	// minor bug fixes, alterations, refactors, updates
-	const int revision = 603;
+	const int revision = 604;
 
 	const std::string version_string = std::to_string(major) + "." + std::to_string(minor) + "." + std::to_string(revision);