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 b21386c964c5ec1e492b512e484831558c001a9f..09b0476b8b26dd49e917f6645117322c67efa5a1 100644 (file)
--- 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;