From ccf48364b1409979df9e5294c82ef41174d10b18 Mon Sep 17 00:00:00 2001
From: TimeServ <timeserv@users.sourceforge.net>
Date: Sun, 14 May 2006 21:43:35 +0000
Subject: [PATCH] r_wateralpha for software rendering

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@2278 fc73d0e0-1445-4013-8a0c-d673dee63da5
---
 engine/client/renderer.c |  2 +-
 engine/sw/r_draw.c       | 32 +++++++++++++++++++++++++++-----
 engine/sw/r_main.c       |  2 ++
 engine/sw/r_misc.c       |  5 +++++
 4 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/engine/client/renderer.c b/engine/client/renderer.c
index f70c51a02..fe2f1b701 100644
--- a/engine/client/renderer.c
+++ b/engine/client/renderer.c
@@ -279,7 +279,6 @@ void GLRenderer_Init(void)
 
 //renderer
 	Cvar_Register (&r_novis, GLRENDEREROPTIONS);
-	Cvar_Register (&r_wateralpha, GLRENDEREROPTIONS);
 	Cvar_Register (&r_mirroralpha, GLRENDEREROPTIONS);
 	Cvar_Register (&r_norefresh, GLRENDEREROPTIONS);
 
@@ -564,6 +563,7 @@ void Renderer_Init(void)
 
 	Cvar_Register (&r_fastsky, GRAPHICALNICETIES);
 	Cvar_Register (&r_fastskycolour, GRAPHICALNICETIES);
+	Cvar_Register (&r_wateralpha, GRAPHICALNICETIES);
 
 	Cvar_Register (&r_drawflat, GRAPHICALNICETIES);
 	Cvar_Register (&r_menutint, GRAPHICALNICETIES);
diff --git a/engine/sw/r_draw.c b/engine/sw/r_draw.c
index 33b6b19f3..f5d1c42ee 100644
--- a/engine/sw/r_draw.c
+++ b/engine/sw/r_draw.c
@@ -632,6 +632,7 @@ R_RenderFace
 */
 void R_RenderFace (msurface_t *fa, int clipflags)
 {
+	extern float r_wateralphaval;
 	int			i, lindex;
 	unsigned	mask;
 	mplane_t	*pplane;
@@ -650,6 +651,16 @@ void R_RenderFace (msurface_t *fa, int clipflags)
 		return;
 	}
 
+	if (r_wateralphaval != 1.0 && fa->flags & SURF_DRAWTURB)
+	{
+		if (fa->nextalphasurface)
+			return;
+
+		fa->nextalphasurface = r_alpha_surfaces;
+		r_alpha_surfaces = fa;
+		return;
+	}
+
 	if ( fa->texinfo->flags & SURF_SKY)
 	{
 		if (R_EmitSkyBox ())
@@ -1351,7 +1362,7 @@ void R_8DrawSpanletAlphaBlend( void )	//8 bit rendering only
 {
 	unsigned btemp;
 
-	D_SetTransLevel(r_q2polydesc.alpha*255.0, BM_BLEND);
+	D_SetTransLevel(r_q2polydesc.alpha/255.0, BM_BLEND);
 
 	do
 	{
@@ -1383,7 +1394,7 @@ void R_8DrawSpanletTurbulentAlphaBlend( void )
 	extern int				*r_turb_turb;
 	unsigned btemp;
 
-	D_SetTransLevel(r_q2polydesc.alpha*255.0, BM_BLEND);
+	D_SetTransLevel(r_q2polydesc.alpha/255.0, BM_BLEND);
 
 	do
 	{
@@ -2099,6 +2110,8 @@ void R_ClipAndDrawPoly ( float alpha, int isturbulent, qboolean textured )
 	{
 		if (alpha == 1 && !isturbulent)
 			r_q2polydesc.drawspanlet = R_32DrawSpanletAlphaTest;
+		else if (alpha <= 0)
+			return;
 		else
 		{
 			r_q2polydesc.alpha = alpha*255;
@@ -2110,7 +2123,9 @@ void R_ClipAndDrawPoly ( float alpha, int isturbulent, qboolean textured )
 	}
 	else if (r_pixbytes == 2)
 	{
-		if (alpha < 0.5)
+		if (alpha < 0.2)
+			return;
+		else if (alpha < 0.5)
 			r_q2polydesc.drawspanlet = R_16DrawSpanlet33Stipple;
 		else if (alpha < 0.9)
 			r_q2polydesc.drawspanlet = R_16DrawSpanlet66Stipple;
@@ -2121,6 +2136,8 @@ void R_ClipAndDrawPoly ( float alpha, int isturbulent, qboolean textured )
 	{
 		if (alpha >= TRANS_UPPER_CAP)
 			r_q2polydesc.drawspanlet = R_8DrawSpanletAlphaTest;
+		else if (alpha <= TRANS_LOWER_CAP)
+			return;
 		else if (isturbulent)
 		{
 			r_q2polydesc.alpha = alpha*255;
@@ -2227,7 +2244,7 @@ void R_BuildPolygonFromSurface(msurface_t *fa)
 	}
 
 // PGM 09/16/98
-	if ( fa->texinfo->flags & (SURF_WARP|SURF_FLOWING) )
+	if ( fa->texinfo->flags & (SURF_WARP|SURF_FLOWING) || (fa->flags & SURF_DRAWTURB) )
 	{
 		r_q2polydesc.pixels       = (qbyte *)fa->texinfo->texture + fa->texinfo->texture->offsets[0];
 		r_q2polydesc.pixel_width  = fa->texinfo->texture->width;
@@ -2278,7 +2295,12 @@ void SWR_DrawAlphaSurfaces( void )
 	{
 		R_BuildPolygonFromSurface( s );
 
-		if (s->texinfo->flags & SURF_TRANS66)
+		if (s->flags & SURF_DRAWTURB)
+		{
+			extern float r_wateralphaval;
+			R_ClipAndDrawPoly( r_wateralphaval, true, true );
+		}
+		else if (s->texinfo->flags & SURF_TRANS66)
 		{
 			R_ClipAndDrawPoly( 0.66f, (s->texinfo->flags & (SURF_WARP|SURF_FLOWING)), true );
 		}
diff --git a/engine/sw/r_main.c b/engine/sw/r_main.c
index 92f000a88..c962bed45 100644
--- a/engine/sw/r_main.c
+++ b/engine/sw/r_main.c
@@ -89,6 +89,8 @@ float	screenAspect;
 float	verticalFieldOfView;
 float	xOrigin, yOrigin;
 
+float r_wateralphaval;
+
 mplane_t	screenedge[4];
 
 //colour bits (for 16 bit rendering)
diff --git a/engine/sw/r_misc.c b/engine/sw/r_misc.c
index 8469cc5ef..52dd2fb95 100644
--- a/engine/sw/r_misc.c
+++ b/engine/sw/r_misc.c
@@ -457,12 +457,17 @@ void SWR_SetupFrame (void)
 	extern int r_dosirds;
 
 	extern int scr_chatmode;
+	extern float r_wateralphaval;
 
 	int				edgecount;
 	vrect_t			vrect;
 	float			w, h;
 
+
 // don't allow cheats in multiplayer
+	r_wateralphaval = r_wateralpha.value;
+	if (!cls.allow_watervis)
+		r_wateralphaval = 1;
 
 	if (r_numsurfs.value)
 	{