Rename "depth fade falloff" to "depth fade threshold" as it makes more sense

src/common/rendering/hwrenderer/data/hw_renderstate.h

@@ -193,7 +193,7 @@ public:
 		mSurfaceUniforms.uLightFactor = 0.0f;
 		mSurfaceUniforms.uFogDensity = 0.0f;
 		mSurfaceUniforms.uLightLevel = -1.0f;
-		mSurfaceUniforms.uDepthFadeFalloff = 0.0f;
+		mSurfaceUniforms.uDepthFadeThreshold = 0.0f;
 		mSpecialEffect = EFF_NONE;
 		mLightIndex = -1;
 		mBoneIndexBase = -1;
@@ -264,9 +264,9 @@ public:
 		mSurfaceUniforms.uDesaturationFactor = 0.0f;
 	}
 
-	void SetDepthFadeFalloff(float falloff)
+	void SetDepthFadeThreshold(float falloff)
 	{
-		mSurfaceUniforms.uDepthFadeFalloff = falloff;
+		mSurfaceUniforms.uDepthFadeThreshold = falloff;
 	}
 
 	void SetTextureClamp(bool on)

src/common/rendering/hwrenderer/data/hw_surfaceuniforms.h

@@ -44,6 +44,6 @@ struct SurfaceUniforms
 
 	float uAlphaThreshold;
 	int uTextureIndex;
-	float uDepthFadeFalloff;
+	float uDepthFadeThreshold;
 	float padding3;
 };

src/common/rendering/vulkan/shaders/vk_shader.cpp

@@ -185,7 +185,7 @@ std::unique_ptr<VulkanShader> VkShaderManager::LoadFragShader(FString shadername
 	if (!key.AlphaTest) definesBlock << "#define NO_ALPHATEST\n";
 	if (key.GBufferPass) definesBlock << "#define GBUFFER_PASS\n";
 
-	if (key.DepthFadeFalloff) definesBlock << "#define USE_DEPTHFADEFALLOFF\n";
+	if (key.DepthFadeThreshold) definesBlock << "#define USE_DEPTHFADETHRESHOLD\n";
 
 	if (key.Simple2D) definesBlock << "#define SIMPLE2D\n";
 	if (key.ClampY) definesBlock << "#define TEXF_ClampY\n";

src/common/rendering/vulkan/shaders/vk_shader.h

@@ -79,7 +79,7 @@ public:
 			uint64_t UseLevelMesh : 1;  // USE_LEVELMESH
 			uint64_t FogBalls : 1;      // FOGBALLS
 			uint64_t NoFragmentShader : 1;
-			uint64_t DepthFadeFalloff : 1;
+			uint64_t DepthFadeThreshold : 1;
 			uint64_t Unused : 41;
 		};
 		uint64_t AsQWORD = 0;

src/common/rendering/vulkan/vk_renderstate.cpp

@@ -258,7 +258,7 @@ void VkRenderState::ApplyRenderPass(int dt)
 	pipelineKey.ShaderKey.Detailmap = (uTextureMode & TEXF_Detailmap) != 0;
 	pipelineKey.ShaderKey.Glowmap = (uTextureMode & TEXF_Glowmap) != 0;
 
-	pipelineKey.ShaderKey.DepthFadeFalloff = mSurfaceUniforms.uDepthFadeFalloff > 0.0f;
+	pipelineKey.ShaderKey.DepthFadeThreshold = mSurfaceUniforms.uDepthFadeThreshold > 0.0f;
 
 	// The way GZDoom handles state is just plain insanity!
 	int fogset = 0;

src/playsim/actor.h

@@ -1128,7 +1128,7 @@ public:
 	DVector2		AutomapOffsets;		// Offset the actors' sprite view on the automap by these coordinates.
 	float			isoscaleY;				// Y-scale to compensate for Y-billboarding for isometric sprites
 	float			isotheta;				// Rotation angle to compensate for Y-billboarding for isometric sprites
-	double			DepthFadeFalloff;		// [Nash] "soft particle" fade factor
+	double			DepthFadeThreshold;		// [Nash] "soft particle" fade threshold in map units
 	DRotator		Angles;
 	DRotator		ViewAngles;			// Angle offsets for cameras
 	TObjPtr<DViewPosition*> ViewPos;			// Position offsets for cameras

src/playsim/p_mobj.cpp

@@ -394,7 +394,7 @@ void AActor::Serialize(FSerializer &arc)
 		A("WorldOffset", WorldOffset)
 		("modelData", modelData)
 		A("LandingSpeed", LandingSpeed)
-		A("DepthFadeFalloff", DepthFadeFalloff)
+		A("DepthFadeThreshold", DepthFadeThreshold)
 
 		("unmorphtime", UnmorphTime)
 		("morphflags", MorphFlags)

src/rendering/hwrenderer/scene/hw_sprites.cpp

@@ -131,7 +131,7 @@ void HWSprite::DrawSprite(HWDrawInfo *di, FRenderState &state, bool translucent)
 		state.SetTextureMode(RenderStyle);
 
 		if (actor)
-			state.SetDepthFadeFalloff(actor->DepthFadeFalloff);
+			state.SetDepthFadeThreshold(actor->DepthFadeThreshold);
 
 		if (hw_styleflags == STYLEHW_NoAlphaTest)
 		{
@@ -328,7 +328,7 @@ void HWSprite::DrawSprite(HWDrawInfo *di, FRenderState &state, bool translucent)
 		state.ClearDepthBias();
 	}
 
-	state.SetDepthFadeFalloff(0.0f);
+	state.SetDepthFadeThreshold(0.0f);
 
 	// [Nash] hitbox debug
 	if (actor && r_showhitbox)

src/scripting/vmthunks_actors.cpp

@@ -2130,7 +2130,7 @@ DEFINE_FIELD(AActor, UnmorphTime)
 DEFINE_FIELD(AActor, MorphFlags)
 DEFINE_FIELD(AActor, PremorphProperties)
 DEFINE_FIELD(AActor, MorphExitFlash)
-DEFINE_FIELD(AActor, DepthFadeFalloff)
+DEFINE_FIELD(AActor, DepthFadeThreshold)
 
 DEFINE_FIELD_X(FCheckPosition, FCheckPosition, thing);
 DEFINE_FIELD_X(FCheckPosition, FCheckPosition, pos);