common: render_api: sync header with engine tree

* We removed TF_ALLOW_EMBOSS that was used for fake bumpmapping/deep frying
  the texture. Fun but useless feature.

* Added TF_ALLOW_NEAREST flag that allows switching to nearest filtering for
  textures without a mipmap (fonts, HUD, etc).

common/render_api.h

@@ -87,7 +87,7 @@ typedef enum
 	TF_KEEP_SOURCE	= (1<<1),		// some images keep source
 	TF_NOFLIP_TGA	= (1<<2),		// Steam background completely ignore tga attribute 0x20
 	TF_EXPAND_SOURCE	= (1<<3),		// Don't keep source as 8-bit expand to RGBA
-	TF_ALLOW_EMBOSS	= (1<<4),		// Allow emboss-mapping for this image
+// reserved
 	TF_RECTANGLE	= (1<<5),		// this is GL_TEXTURE_RECTANGLE
 	TF_CUBEMAP	= (1<<6),		// it's cubemap texture
 	TF_DEPTHMAP	= (1<<7),		// custom texture filter used
@@ -112,7 +112,8 @@ typedef enum
 	TF_ARB_FLOAT	= (1<<26),	// float textures
 	TF_NOCOMPARE	= (1<<27),	// disable comparing for depth textures
 	TF_ARB_16BIT	= (1<<28),	// keep image as 16-bit (not 24)
-	TF_MULTISAMPLE  = (1<<29),  // multisample texture
+	TF_MULTISAMPLE	= (1<<29),	// multisampling texture
+	TF_ALLOW_NEAREST = (1<<30),	// allows toggling nearest filtering for TF_NOMIPMAP textures
 } texFlags_t;
 
 typedef enum
@@ -280,4 +281,5 @@ typedef struct render_interface_s
 	// shuffle previous & next states for lerping
 	void		(*CL_UpdateLatchedVars)( struct cl_entity_s *e, qboolean reset );
 } render_interface_t;
+
 #endif//RENDER_API_H