From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sat, 22 Jan 2011 23:28:01 +0000 (+0000)
Subject: use texel center sampling on textures
X-Git-Tag: xonotic-v0.5.0~438^2~119
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=f2e42c3bc66323db7673d8c278e9619e6efc1c71;p=xonotic%2Fdarkplaces.git

use texel center sampling on textures


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10722 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/dpsoftrast.c b/dpsoftrast.c
index d08de72a..7669562b 100644
--- a/dpsoftrast.c
+++ b/dpsoftrast.c
@@ -1401,8 +1401,8 @@ void DPSOFTRAST_Draw_Span_Texture2DVarying(const DPSOFTRAST_State_Draw_Span *spa
 			for (x = startx;x < endx;x++)
 			{
 				z = zf[x];
-				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0];
-				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1];
+				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0] - 0.5f;
+				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1] - 0.5f;
 				tci[0] = (int)floor(tc[0]);
 				tci[1] = (int)floor(tc[1]);
 				tci1[0] = tci[0] + 1;
@@ -1436,8 +1436,8 @@ void DPSOFTRAST_Draw_Span_Texture2DVarying(const DPSOFTRAST_State_Draw_Span *spa
 			for (x = startx;x < endx;x++)
 			{
 				z = zf[x];
-				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0];
-				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1];
+				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0] - 0.5f;
+				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1] - 0.5f;
 				tci[0] = (int)floor(tc[0]);
 				tci[1] = (int)floor(tc[1]);
 				tci1[0] = tci[0] + 1;
@@ -1474,8 +1474,8 @@ void DPSOFTRAST_Draw_Span_Texture2DVarying(const DPSOFTRAST_State_Draw_Span *spa
 			for (x = startx;x < endx;x++)
 			{
 				z = zf[x];
-				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0];
-				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1];
+				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0] - 0.5f;
+				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1] - 0.5f;
 				tci[0] = (int)floor(tc[0]);
 				tci[1] = (int)floor(tc[1]);
 				tci[0] = tci[0] >= tcimin[0] ? (tci[0] <= tcimax[0] ? tci[0] : tcimax[0]) : tcimin[0];
@@ -1496,8 +1496,8 @@ void DPSOFTRAST_Draw_Span_Texture2DVarying(const DPSOFTRAST_State_Draw_Span *spa
 			for (x = startx;x < endx;x++)
 			{
 				z = zf[x];
-				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0];
-				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1];
+				tc[0] = (data[0] + slope[0]*x) * z * tcscale[0] - 0.5f;
+				tc[1] = (data[1] + slope[1]*x) * z * tcscale[1] - 0.5f;
 				tci[0] = (int)floor(tc[0]);
 				tci[1] = (int)floor(tc[1]);
 				tci[0] &= tciwrapmask[0];