From: eihrul <eihrul@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Mon, 7 Feb 2011 06:37:54 +0000 (+0000)
Subject: fix for span endpoint interpolation
X-Git-Tag: xonotic-v0.5.0~438^2~19
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=29d5320256039c8a357e365e391ed924a852e945;p=xonotic%2Fdarkplaces.git

fix for span endpoint interpolation


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10822 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/dpsoftrast.c b/dpsoftrast.c
index b21386c9..09b0476b 100644
--- a/dpsoftrast.c
+++ b/dpsoftrast.c
@@ -4669,20 +4669,16 @@ static void DPSOFTRAST_Interpret_Draw(DPSOFTRAST_State_Thread *thread, DPSOFTRAS
 			ycc = _mm_min_epi16(ycc, _mm_shuffle_epi32(ycc, _MM_SHUFFLE(2, 3, 0, 1)));
 			nexty = _mm_extract_epi16(ycc, 0);
 			if (nexty >= bandy) nexty = bandy-1;
-			if (_mm_ucomigt_ss(_mm_max_ss(screen[edge0n], screen[edge0p]), _mm_min_ss(screen[edge1n], screen[edge1p])))
-			{
-				int tmp = edge0n;
-				edge0n = edge1n;
-				edge1n = tmp;
-				tmp = edge0p;
-				edge0p = edge1p;
-				edge1p = tmp;
-			}
 			xslope = _mm_sub_ps(_mm_movelh_ps(screen[edge0n], screen[edge1n]), _mm_movelh_ps(screen[edge0p], screen[edge1p]));
 			xslope = _mm_div_ps(xslope, _mm_shuffle_ps(xslope, xslope, _MM_SHUFFLE(3, 3, 1, 1)));
 			xcoords = _mm_add_ps(_mm_movelh_ps(screen[edge0p], screen[edge1p]),
 								_mm_mul_ps(xslope, _mm_sub_ps(_mm_set1_ps(y), _mm_shuffle_ps(screen[edge0p], screen[edge1p], _MM_SHUFFLE(1, 1, 1, 1)))));
 			xcoords = _mm_add_ps(xcoords, _mm_set1_ps(0.5f));
+			if (_mm_ucomigt_ss(xcoords, _mm_shuffle_ps(xcoords, xcoords, _MM_SHUFFLE(1, 0, 3, 2))))
+			{
+				xcoords = _mm_shuffle_ps(xcoords, xcoords, _MM_SHUFFLE(1, 0, 3, 2));
+				xslope = _mm_shuffle_ps(xslope, xslope, _MM_SHUFFLE(1, 0, 3, 2));
+			}
 			for(; y <= nexty; y++, xcoords = _mm_add_ps(xcoords, xslope))
 			{
 				int startx, endx, offset;