Move no-mipmapping from actor renderflag/particle flag, to a material property in GLDEFS, where it makes more sense. The feature was introduced in the short-lived engine version of 4.13 which was deemed too broken and needed to be replaced with a newer version anyway, so might as well perform an API-breaking change at this point in time. Note that this currently only works for sprites (its primary targeted use case) -- walls, flats and models can be patched in later.

src/common/textures/gametexture.h

@@ -62,6 +62,7 @@ enum EGameTexFlags
 	GTexf_OffsetsNotForFont = 512,			// The offsets must be ignored when using this texture in a font.
 	GTexf_NoTrim = 1024,					// Don't perform trimming on this texture.
 	GTexf_Seen = 2048,						// Set to true when the texture is being used for rendering. Must be cleared manually if the check is needed.
+	GTexf_NoMipmap = 4096,					// Disable mipmapping for this texture
 };
 
 struct FMaterialLayers
@@ -265,6 +266,9 @@ public:
 	void SetGlowing(PalEntry color) { flags = (flags & ~GTexf_AutoGlowing) | GTexf_Glowing; GlowColor = color; }
 	void SetDisableBrightmap() { flags |= GTexf_BrightmapChecked; Brightmap = nullptr; }
 
+	bool isNoMipmap() const { return !!(flags & GTexf_NoMipmap); }
+	void SetNoMipmap(bool set) { if (set) flags |= GTexf_NoMipmap; else flags &= ~GTexf_NoMipmap; }
+
 	bool isUserContent() const;
 	int CheckRealHeight() { return xs_RoundToInt(Base->CheckRealHeight() / ScaleY); }
 	void SetSize(int x, int y) 

src/playsim/actor.h

@@ -502,10 +502,9 @@ enum ActorRenderFlag2
 	RF2_FLIPSPRITEOFFSETX		= 0x0010,
 	RF2_FLIPSPRITEOFFSETY		= 0x0020,
 	RF2_CAMFOLLOWSPLAYER		= 0x0040,	// Matches the cam's base position and angles to the main viewpoint.
-	RF2_NOMIPMAP				= 0x0080,	// [Nash] forces no mipmapping on sprites. Useful for tiny sprites that need to remain visually crisp
-	RF2_ISOMETRICSPRITES		= 0x0100,
-	RF2_SQUAREPIXELS			= 0x0200,	// apply +ROLLSPRITE scaling math so that non rolling sprites get the same scaling
-	RF2_STRETCHPIXELS			= 0x0400,	// don't apply SQUAREPIXELS for ROLLSPRITES
+	RF2_ISOMETRICSPRITES		= 0x0080,
+	RF2_SQUAREPIXELS			= 0x0100,	// apply +ROLLSPRITE scaling math so that non rolling sprites get the same scaling
+	RF2_STRETCHPIXELS			= 0x0200,	// don't apply SQUAREPIXELS for ROLLSPRITES
 };
 
 // This translucency value produces the closest match to Heretic's TINTTAB.

src/playsim/p_effect.h

@@ -69,8 +69,7 @@ enum EParticleFlags
 	SPF_FACECAMERA				= 1 << 11,
 	SPF_NOFACECAMERA			= 1 << 12,
 	SPF_ROLLCENTER				= 1 << 13,
-	SPF_NOMIPMAP				= 1 << 14,
-	SPF_STRETCHPIXELS			= 1 << 15,
+	SPF_STRETCHPIXELS			= 1 << 14,
 };
 
 class DVisualThinker;

src/r_data/gldefs.cpp

@@ -1270,6 +1270,7 @@ class GLDefsParser
 		bool disable_fullbright_specified = false;
 		bool thiswad = false;
 		bool iwad = false;
+		bool no_mipmap = false;
 
 		UserShaderDesc usershader;
 		TArray<FString> texNameList;
@@ -1319,6 +1320,10 @@ class GLDefsParser
 				// only affects textures defined in the IWAD.
 				iwad = true;
 			}
+			else if (sc.Compare("nomipmap"))
+			{
+				no_mipmap = true;
+			}
 			else if (sc.Compare("glossiness"))
 			{
 				sc.MustGetFloat();
@@ -1422,6 +1427,8 @@ class GLDefsParser
 			if (!useme) return;
 		}
 
+		tex->SetNoMipmap(no_mipmap);
+
 		FGameTexture **bindings[6] =
 		{
 			&mlay.Brightmap,
@@ -1681,6 +1688,7 @@ class GLDefsParser
 			bool disable_fullbright = false;
 			bool thiswad = false;
 			bool iwad = false;
+			bool no_mipmap = false;
 			int maplump = -1;
 			UserShaderDesc desc;
 			desc.shaderType = SHADER_Default;
@@ -1723,6 +1731,10 @@ class GLDefsParser
 					if (!found)
 						sc.ScriptError("Unknown material type '%s' specified\n", sc.String);
 				}
+				else if (sc.Compare("nomipmap"))
+				{
+					no_mipmap = true;
+				}
 				else if (sc.Compare("speed"))
 				{
 					sc.MustGetFloat();
@@ -1784,6 +1796,8 @@ class GLDefsParser
 				return;
 			}
 
+			tex->SetNoMipmap(no_mipmap);
+
 			int firstUserTexture;
 			switch (desc.shaderType)
 			{

src/rendering/hwrenderer/scene/hw_drawstructs.h

@@ -393,8 +393,6 @@ public:
 	TArray<lightlist_t> *lightlist;
 	DRotator Angles;
 
-	bool nomipmap; // force the sprite to have no mipmaps (ensures tiny sprites in the distance stay crisp)
-
 	void SplitSprite(HWDrawInfo *di, sector_t * frontsector, bool translucent);
 	void PerformSpriteClipAdjustment(AActor *thing, const DVector2 &thingpos, float spriteheight);
 	bool CalculateVertices(HWDrawInfo *di, FVector3 *v, DVector3 *vp);

src/rendering/hwrenderer/scene/hw_sprites.cpp

@@ -224,7 +224,12 @@ void HWSprite::DrawSprite(HWDrawInfo *di, FRenderState &state, bool translucent)
 		state.SetFog(0, 0);
 	}
 
-	int clampmode = nomipmap ? CLAMP_XY_NOMIP : CLAMP_XY;
+	int clampmode = CLAMP_XY;
+
+	if (texture && texture->isNoMipmap())
+	{
+		clampmode = CLAMP_XY_NOMIP;
+	}
 
 	uint32_t spritetype = actor? uint32_t(actor->renderflags & RF_SPRITETYPEMASK) : 0;
 	if (texture) state.SetMaterial(texture, UF_Sprite, (spritetype == RF_FACESPRITE) ? CTF_Expand : 0, clampmode, translation, OverrideShader);
@@ -786,8 +791,6 @@ void HWSprite::Process(HWDrawInfo *di, AActor* thing, sector_t * sector, area_t
 			return;
 	}
 
-	nomipmap = (thing->renderflags2 & RF2_NOMIPMAP);
-
 	// check renderrequired vs ~r_rendercaps, if anything matches we don't support that feature,
 	// check renderhidden vs r_rendercaps, if anything matches we do support that feature and should hide it.
 	if ((!r_debug_disable_vis_filter && !!(thing->RenderRequired & ~r_renderercaps)) ||
@@ -1420,7 +1423,6 @@ void HWSprite::ProcessParticle(HWDrawInfo *di, particle_t *particle, sector_t *s
 	actor = nullptr;
 	this->particle = particle;
 	fullbright = particle->flags & SPF_FULLBRIGHT;
-	nomipmap = particle->flags & SPF_NOMIPMAP;
 
 	if (di->isFullbrightScene()) 
 	{

src/scripting/thingdef_data.cpp

@@ -383,7 +383,6 @@ static FFlagDef ActorFlagDefs[]=
 	DEFINE_FLAG(RF2, FLIPSPRITEOFFSETX, AActor, renderflags2),
 	DEFINE_FLAG(RF2, FLIPSPRITEOFFSETY, AActor, renderflags2),
 	DEFINE_FLAG(RF2, CAMFOLLOWSPLAYER, AActor, renderflags2),
-	DEFINE_FLAG(RF2, NOMIPMAP, AActor, renderflags2),
 	DEFINE_FLAG(RF2, ISOMETRICSPRITES, AActor, renderflags2),
 	DEFINE_FLAG(RF2, SQUAREPIXELS, AActor, renderflags2),
 

wadsrc/static/zscript/constants.zs

@@ -722,8 +722,7 @@ enum EParticleFlags
 	SPF_FACECAMERA				= 1 << 11,
 	SPF_NOFACECAMERA			= 1 << 12,
 	SPF_ROLLCENTER				= 1 << 13,
-	SPF_NOMIPMAP				= 1 << 14,
-	SPF_STRETCHPIXELS			= 1 << 15,
+	SPF_STRETCHPIXELS			= 1 << 14,
 
 	SPF_RELATIVE				= SPF_RELPOS|SPF_RELVEL|SPF_RELACCEL|SPF_RELANG
 };