From c486f9e74a6faf4ef1e2c573b28745d8286b8545 Mon Sep 17 00:00:00 2001
From: Raimon Zamora <jaildoctor@gmail.com>
Date: Mon, 2 Mar 2026 16:44:11 +0100
Subject: [PATCH] - [FIX] Arreglades "noisy lines" entre piso i lower_wall de
 sector anterior. - [FIX] Arreglades "noisy lines" al interpolar textures (no
 totes).

---
 main.cpp | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/main.cpp b/main.cpp
index 389198f..1216780 100644
--- a/main.cpp
+++ b/main.cpp
@@ -396,7 +396,8 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
                     if (wall_start+i>=end) break;
                     float light_dist = 1.0f - (dist>light_zoom ? 1.0f : dist/light_zoom);
                     float light = 1.0f - (light_dist*s.light);
-                    uint8_t pixcolor = surf->pixels[(int(v)%surf->w)+(int(cpix)%surf->h)*surf->w];
+                    int i_cpix = SDL_roundf(cpix);
+                    uint8_t pixcolor = surf->pixels[(int(v)%surf->w)+(i_cpix%surf->h)*surf->w];
                     pixcolor = colormap[pixcolor + int(light*31)*256];
                     draw::putpd(screen_column, wall_start+i, pixcolor, stright_dist);
                     cpix += dpix;
@@ -410,13 +411,14 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
                 upper_wall_height -= wall_cut;
                 if (upper_wall_height>0.0f)
                 {
-                    // Pinta la pared
+                    // Pinta la pared superior
                     if (w->upper_surf)
                     for (int i=0; i<upper_wall_height; ++i) {
                         if (wall_start+i>=end) break;
                         float light_dist = 1.0f - (dist>light_zoom ? 1.0f : dist/light_zoom);
                         float light = 1.0f - (light_dist*s.light);
-                        uint8_t pixcolor = w->upper_surf->pixels[(int(v)%w->upper_surf->w)+(int(cpix)%w->upper_surf->h)*w->upper_surf->w];
+                        int i_cpix = SDL_roundf(cpix);
+                        uint8_t pixcolor = w->upper_surf->pixels[(int(v)%w->upper_surf->w)+(i_cpix%w->upper_surf->h)*w->upper_surf->w];
                         pixcolor = colormap[pixcolor + int(light*31)*256];
                         draw::putpd(screen_column, wall_start+i, pixcolor, stright_dist);
                         cpix += dpix;
@@ -427,9 +429,9 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
             }
             float lower_height = sectors[w->portal].floor_height - s.floor_height;
             float lower_wall_height = (lower_height*FOV)/dist;
-            int wall_end = wall_start+wall_height+1; 
-            if (lower_wall_height>0.0f) wall_end -= lower_wall_height;
-            wall_end = SDL_min(wall_end, end);
+            float fwall_end = wall_start+wall_height+1; 
+            if (lower_wall_height>0.0f) fwall_end -= lower_wall_height;
+            int wall_end = SDL_min(fwall_end, end);
 
             //SDL_assert(&s != &sectors[w->portal]);
             //printf("Anem al sector: %i\n", w->portal);
@@ -452,7 +454,8 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
                     if (wall_start+i>=end) break;
                     float light_dist = 1.0f - (dist>light_zoom ? 1.0f : dist/light_zoom);
                     float light = 1.0f - (light_dist*s.light);
-                    uint8_t pixcolor = surf->pixels[(int(v)%surf->w)+(int(cpix)%surf->h)*surf->w];
+                    int i_cpix = SDL_roundf(cpix);
+                    uint8_t pixcolor = surf->pixels[(int(v)%surf->w)+(i_cpix%surf->h)*surf->w];
                     pixcolor = colormap[pixcolor + int(light*31)*256];
                     draw::putps(screen_column, wall_start+i, pixcolor, stright_dist);
                     cpix += dpix;
@@ -462,15 +465,16 @@ void drawColumn(sector &s, int screen_column, int start, int end, float a_inc, v
             if (lower_wall_height>0.0f)
             {
                 cpix += (wall_height-lower_wall_height)*dpix;
-                // Pinta la pared
+                // Pinta la pared inferior
                 if (w->lower_surf)
                 for (int i=0; i<lower_wall_height; ++i) {
                     if (wall_end+i>=end) break;
                     float light_dist = 1.0f - (dist>light_zoom ? 1.0f : dist/light_zoom);
                     float light = 1.0f - (light_dist*s.light);
-                    uint8_t pixcolor = w->lower_surf->pixels[(int(v)%w->lower_surf->w)+(int(cpix)%w->lower_surf->h)*w->lower_surf->w];
+                    int i_cpix = SDL_roundf(cpix);
+                    uint8_t pixcolor = w->lower_surf->pixels[(int(v)%w->lower_surf->w)+(i_cpix%w->lower_surf->h)*w->lower_surf->w];
                     pixcolor = colormap[pixcolor + int(light*31)*256];
-                    draw::putpd(screen_column, wall_end+i, pixcolor, stright_dist);
+                    draw::putpd(screen_column, wall_end+i-1, pixcolor, stright_dist);
                     cpix += dpix;
                 }
                 //wall_start += upper_wall_height;