From 5c0a57fe9f217aabfd109f7d1b2dc0f603cabd19 Mon Sep 17 00:00:00 2001
From: Alaux <73968015+MrAlaux@users.noreply.github.com>
Date: Fri, 10 Jan 2025 01:07:42 -0300
Subject: [PATCH] Low-res pixel width/height settings, and more

Also added another debugging cheat.
---
 CHANGELOG.md  |  1 +
 README.md     |  1 +
 src/m_cheat.c | 14 ++++++++++--
 src/r_main.c  | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 75 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 651ab8bb3..5384ec6f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 - **_Message Fadeout_** setting
 - **_Weapon Bob Speed_** setting
 - **_Bob [Weapon] While Switching_** setting
+- **Low-resolution pixel width/height** settings
 - **_[Color] Contrast_** setting [by @pvictress]
 
 ## Changes
diff --git a/README.md b/README.md
index 01b431085..b3a0770a7 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,7 @@ For these settings, their CVAR names are provided alongside the _CFG-only_ label
 - **_No palette tint in menus_** setting [i.b. Crispy Doom]
 - **_HUD/Menu Shadows_** setting (translucency determined by the CFG-only `hud_menu_shadows_filter_pct` CVAR) [i.b. CRL]
 - **_Flip Levels_** setting
+- **Low-resolution pixel width/height** settings, to enlarge pixels when using 100% resolution (CFG-only: `lowres_pixel_width`, `lowres_pixel_height`) [i.b. Doom Retro]
 - **_No Berserk Tint_** setting
 - **_No Radiation Suit Tint_** setting
 - **_Night-Vision Visor Effect_** setting [i.b. International Doom]
diff --git a/src/m_cheat.c b/src/m_cheat.c
index b489fac98..f0dcce153 100644
--- a/src/m_cheat.c
+++ b/src/m_cheat.c
@@ -65,10 +65,17 @@
 //#define NUGMAGIC
 
 #ifdef NUGMAGIC
-static void cheat_magic()
+
+static void cheat_magic(void)
+{
+  
+}
+
+static void cheat_magic2(void)
 {
   
 }
+
 #endif
 
 // [Nugget] --------------------------/
@@ -440,7 +447,10 @@ struct cheat_s cheat[] = {
   {"idgaf",      NULL, not_net | not_demo, {cheat_idgaf}      },
 
   #ifdef NUGMAGIC
-  {"ggg", NULL, 0, {cheat_magic}},
+
+  {"ggg", NULL, 0, {.v = cheat_magic}},
+  {"hhh", NULL, 0, {.v = cheat_magic2}},
+
   #endif
 
   // [Nugget] ---------------------------------------------------------------/
diff --git a/src/r_main.c b/src/r_main.c
index 1944c7efb..eeb850b77 100644
--- a/src/r_main.c
+++ b/src/r_main.c
@@ -141,6 +141,8 @@ int extra_level_brightness;               // level brightness feature
 // CVARs ---------------------------------------------------------------------
 
 boolean flip_levels;
+static int lowres_pixel_width;
+static int lowres_pixel_height;
 boolean nightvision_visor;
 int fake_contrast;
 boolean diminished_lighting;
@@ -1752,6 +1754,55 @@ void R_RenderPlayerView (player_t* player)
   R_SetFuzzPosDraw();
   R_DrawMasked ();
 
+  // [Nugget]
+  if (!strictmode && current_video_height == SCREENHEIGHT
+      && (lowres_pixel_width > 1 || lowres_pixel_height > 1))
+  {
+    int y, x, y2;
+
+    const int pw = lowres_pixel_width,
+              ph = lowres_pixel_height;
+
+    int first_y = ((viewheight % ph) / 2),
+        first_x;
+
+    byte *const dest = I_VideoBuffer;
+
+    for (y = viewwindowy;  y < (viewwindowy + viewheight);)
+    {
+      first_x = (viewwidth % pw) / 2;
+
+      for (x = viewwindowx;  x < (viewwindowx + viewwidth);)
+      {
+        for (y2 = 0;  y2 < (first_y ? first_y : MIN(ph, (viewwindowy + viewheight) - y));  y2++)
+        {
+          memset(
+            dest + ((y + y2) * video.pitch) + x,
+            dest[
+              ( (first_y ? viewwindowy + first_y
+                         : y + ((y < viewwindowy + viewheight/2) ? ph-1 : 0)) * video.pitch)
+              + (first_x ? viewwindowx + first_x
+                         : x + ((x < viewwindowx + viewwidth/2)  ? pw-1 : 0))
+            ],
+            first_x ? first_x : MIN(pw, (viewwindowx + viewwidth) - x)
+          );
+        }
+
+        if (first_x) {
+          x += first_x;
+          first_x = 0;
+        }
+        else { x += pw; }
+      }
+
+      if (first_y) {
+        y += first_y;
+        first_y = 0;
+      }
+      else { y += ph; }
+    }
+  }
+
   // Check for new console commands.
   NetUpdate ();
 }
@@ -1797,6 +1848,16 @@ void R_BindRenderVariables(void)
 
   BIND_BOOL_GENERAL(flip_levels, false, "Flip levels horizontally (visual filter)");
 
+  // (CFG-only)
+  M_BindNum("lowres_pixel_width", &lowres_pixel_width, NULL,
+            1, 1, 8, ss_none, wad_yes,
+            "Width multiplier for pixels at 100% resolution");
+
+  // (CFG-only)
+  M_BindNum("lowres_pixel_height", &lowres_pixel_height, NULL,
+            1, 1, 8, ss_none, wad_yes,
+            "Height multiplier for pixels at 100% resolution");
+
   BIND_BOOL_GENERAL(no_berserk_tint, false, "Disable Berserk tint");
   BIND_BOOL_GENERAL(no_radsuit_tint, false, "Disable Radiation Suit tint");