From 2f2890cd1107e7ff21b0dc742cbd554a77d81b00 Mon Sep 17 00:00:00 2001
From: Alibek Omarov <a1ba.omarov@gmail.com>
Date: Thu, 25 Jan 2024 05:50:11 +0300
Subject: [PATCH] engine: client: use PARM_TEX_FILTERING to figure out whether
 we should apply half-texel trick to HUD textures when scaling

---
 engine/client/cl_game.c | 30 +++++++++++++++++-------------
 engine/client/client.h  |  1 -
 2 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/engine/client/cl_game.c b/engine/client/cl_game.c
index f8413b5d..53368b67 100644
--- a/engine/client/cl_game.c
+++ b/engine/client/cl_game.c
@@ -357,20 +357,23 @@ void SPR_AdjustSize( float *x, float *y, float *w, float *h )
 	*h *= yscale;
 }
 
-void SPR_AdjustTexCoords( float width, float height, float *s1, float *t1, float *s2, float *t2 )
+static void SPR_AdjustTexCoords( int texnum, float width, float height, float *s1, float *t1, float *s2, float *t2 )
 {
-	if( refState.width != clgame.scrInfo.iWidth )
+	if( REF_GET_PARM( PARM_TEX_FILTERING, texnum ))
 	{
-		// align to texel if scaling
-		*s1 += 0.5f;
-		*s2 -= 0.5f;
-	}
+		if( refState.width != clgame.scrInfo.iWidth )
+		{
+			// align to texel if scaling
+			*s1 += 0.5f;
+			*s2 -= 0.5f;
+		}
 
-	if( refState.height != clgame.scrInfo.iHeight )
-	{
-		// align to texel if scaling
-		*t1 += 0.5f;
-		*t2 -= 0.5f;
+		if( refState.height != clgame.scrInfo.iHeight )
+		{
+			// align to texel if scaling
+			*t1 += 0.5f;
+			*t2 -= 0.5f;
+		}
 	}
 
 	*s1 /= width;
@@ -402,6 +405,8 @@ static void SPR_DrawGeneric( int frame, float x, float y, float width, float hei
 		height = h;
 	}
 
+	texnum = ref.dllFuncs.R_GetSpriteTexture( clgame.ds.pSprite, frame );
+
 	if( prc )
 	{
 		wrect_t	rc = *prc;
@@ -418,7 +423,7 @@ static void SPR_DrawGeneric( int frame, float x, float y, float width, float hei
 		t2 = rc.bottom;
 
 		// calc user-defined rectangle
-		SPR_AdjustTexCoords( width, height, &s1, &t1, &s2, &t2 );
+		SPR_AdjustTexCoords( texnum, width, height, &s1, &t1, &s2, &t2 );
 		width = rc.right - rc.left;
 		height = rc.bottom - rc.top;
 	}
@@ -434,7 +439,6 @@ static void SPR_DrawGeneric( int frame, float x, float y, float width, float hei
 
 	// scale for screen sizes
 	SPR_AdjustSize( &x, &y, &width, &height );
-	texnum = ref.dllFuncs.R_GetSpriteTexture( clgame.ds.pSprite, frame );
 	ref.dllFuncs.Color4ub( clgame.ds.spriteColor[0], clgame.ds.spriteColor[1], clgame.ds.spriteColor[2], clgame.ds.spriteColor[3] );
 	ref.dllFuncs.R_DrawStretchPic( x, y, width, height, s1, t1, s2, t2, texnum );
 }
diff --git a/engine/client/client.h b/engine/client/client.h
index 40b58ff9..c8d514a8 100644
--- a/engine/client/client.h
+++ b/engine/client/client.h
@@ -846,7 +846,6 @@ model_t *CL_LoadClientSprite( const char *filename );
 model_t *CL_LoadModel( const char *modelname, int *index );
 HSPRITE pfnSPR_LoadExt( const char *szPicName, uint texFlags );
 void SPR_AdjustSize( float *x, float *y, float *w, float *h );
-void SPR_AdjustTexCoords( float width, float height, float *s1, float *t1, float *s2, float *t2 );
 int CL_GetScreenInfo( SCREENINFO *pscrinfo );
 void CL_FillRGBA( int x, int y, int width, int height, int r, int g, int b, int a );
 pmtrace_t *PM_CL_TraceLine( float *start, float *end, int flags, int usehull, int ignore_pe );