Add SPF_NOMIPMAP to force actor sprites or particles to have no mipmaps. This makes tiny sprites/particles look more crisp and legible in the distance. Mipmapping causes the sprites/particles to have an inconsistent look where they'd sometimes be clearly visible and sometimes less visible depending on camera distance and movement.

src/playsim/actor.h

@@ -501,6 +501,7 @@ 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
 };
 
 // This translucency value produces the closest match to Heretic's TINTTAB.

src/playsim/p_effect.h

@@ -69,6 +69,7 @@ enum EParticleFlags
 	SPF_FACECAMERA				= 1 << 11,
 	SPF_NOFACECAMERA			= 1 << 12,
 	SPF_ROLLCENTER				= 1 << 13,
+	SPF_NOMIPMAP				= 1 << 14,
 };
 
 class DVisualThinker;

src/rendering/hwrenderer/scene/hw_drawstructs.h

@@ -393,6 +393,7 @@ 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);

src/rendering/hwrenderer/scene/hw_sprites.cpp

@@ -221,8 +221,10 @@ void HWSprite::DrawSprite(HWDrawInfo *di, FRenderState &state, bool translucent)
 		state.SetFog(0, 0);
 	}
 
+	int clampmode = nomipmap ? CLAMP_XY_NOMIP : CLAMP_XY;
+
 	uint32_t spritetype = actor? uint32_t(actor->renderflags & RF_SPRITETYPEMASK) : 0;
-	if (texture) state.SetMaterial(texture, UF_Sprite, (spritetype == RF_FACESPRITE) ? CTF_Expand : 0, CLAMP_XY, translation, OverrideShader);
+	if (texture) state.SetMaterial(texture, UF_Sprite, (spritetype == RF_FACESPRITE) ? CTF_Expand : 0, clampmode, translation, OverrideShader);
 	else if (!modelframe) state.EnableTexture(false);
 
 	//SetColor(lightlevel, rel, Colormap, trans);
@@ -771,6 +773,8 @@ 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)) ||
@@ -1325,6 +1329,7 @@ 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

@@ -384,6 +384,7 @@ 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),
 
 	// Bounce flags
 	DEFINE_FLAG2(BOUNCE_Walls, BOUNCEONWALLS, AActor, BounceFlags),

wadsrc/static/zscript/constants.zs

@@ -718,6 +718,7 @@ enum EParticleFlags
 	SPF_FACECAMERA				= 1 << 11,
 	SPF_NOFACECAMERA			= 1 << 12,
 	SPF_ROLLCENTER				= 1 << 13,
+	SPF_NOMIPMAP				= 1 << 14,
 
 	SPF_RELATIVE				= SPF_RELPOS|SPF_RELVEL|SPF_RELACCEL|SPF_RELANG
 };