common: add mirror definitions

common/bspfile.h

@@ -54,6 +54,7 @@ BRUSH MODELS
 #define SURF_CONVEYOR		BIT( 6 )		// scrolled texture (was SURF_DRAWBACKGROUND)
 #define SURF_UNDERWATER		BIT( 7 )		// caustics
 #define SURF_TRANSPARENT		BIT( 8 )		// it's a transparent texture (was SURF_DONTWARP)
+#define SURF_REFLECT		BIT( 31 )		// mirrors
 
 // lightstyle management
 #define LM_STYLES			4		// MAXLIGHTMAPS

common/com_model.h

@@ -228,7 +228,9 @@ typedef struct mextrasurf_s
 	unsigned short	numverts;		// world->vertexes[]
 	int		firstvertex;	// fisrt look up in tr.tbn_vectors[], then acess to world->vertexes[]
 
-	intptr_t	reserved[32];	// just for future expansions or mod-makers
+	struct mextrasurf_s *mirrorchain; // engine-side mirrors, may be ignored in mods with custom renderers
+
+	intptr_t	reserved[31];	// just for future expansions or mod-makers
 } mextrasurf_t;
 
 struct msurface_s

common/const.h

@@ -114,6 +114,8 @@
 #define EF_LIGHT			64	// rocket flare glow sprite
 #define EF_NODRAW			128	// don't draw entity
 
+#define EF_NOREFLECT		(1U<<24)	// Entity won't reflecting in mirrors
+#define EF_REFLECTONLY		(1U<<25)	// Entity will be drawing only in mirrors
 #define EF_WATERSIDES		(1U<<26)	// Do not remove sides for func_water entity
 #define EF_FULLBRIGHT		(1U<<27)	// Just get fullbright
 #define EF_NOSHADOW			(1U<<28)	// ignore shadow for this entity

common/enginefeatures.h

@@ -27,6 +27,7 @@ GNU General Public License for more details.
 #define ENGINE_COMPUTE_STUDIO_LERP	(1<<7)	// enable MOVETYPE_STEP lerping back in engine
 #define ENGINE_LINEAR_GAMMA_SPACE	(1<<8)	// disable influence of gamma/brightness cvars to textures/lightmaps, for mods with custom renderer
 
+#define ENGINE_ALLOW_MIRRORS		(1U<<30) // allow mirrors in engine renderer
 #define ENGINE_STEP_POSHISTORY_LERP (1U<<31) // enable MOVETYPE_STEP interpolation based on position history. Incompatible with ENGINE_COMPUTE_STUDIO_LERP!
 
 // adjust the mask when features will be added or removed
@@ -40,6 +41,7 @@ GNU General Public License for more details.
 	| ENGINE_IMPROVED_LINETRACE   \
 	| ENGINE_COMPUTE_STUDIO_LERP  \
 	| ENGINE_LINEAR_GAMMA_SPACE   \
+	| ENGINE_ALLOW_MIRRORS        \
 	| ENGINE_STEP_POSHISTORY_LERP )
 
 #endif//FEATURES_H

engine/ref_api.h

@@ -77,6 +77,7 @@ GNU General Public License for more details.
 #define FWORLD_CUSTOM_SKYBOX		BIT( 1 )
 #define FWORLD_WATERALPHA		BIT( 2 )
 #define FWORLD_HAS_DELUXEMAP		BIT( 3 )
+#define FWORLD_HAS_MIRRORS		BIT( 4 )
 
 // special rendermode for screenfade modulate
 // (probably will be expanded at some point)