devmode render: show a list of errored holey textures on the HUD

Holey textures (textures with transparent pixels) cannot
be used on upper/lower textures or on 1-sided linedefs. If
the game tries to render this, the texture name will
appear on the HUD if devmode render is turned on.

src/CMakeLists.txt

@@ -72,6 +72,7 @@ add_executable(SRB2SDL2 MACOSX_BUNDLE WIN32
 	r_data.c
 	r_debug.cpp
 	r_debug_parser.cpp
+	r_debug_printer.cpp
 	r_draw.cpp
 	r_fps.c
 	r_main.cpp

src/d_main.cpp

@@ -90,6 +90,7 @@
 #include "k_dialogue.h"
 #include "k_bans.h"
 #include "k_credits.h"
+#include "r_debug.hpp"
 
 #ifdef HWRENDER
 #include "hardware/hw_main.h" // 3D View Rendering
@@ -663,6 +664,7 @@ static bool D_Display(void)
 				{
 					AM_Drawer();
 					ST_Drawer();
+					srb2::r_debug::draw_frame_list();
 					F_TextPromptDrawer();
 					break;
 				}
@@ -858,6 +860,7 @@ void D_SRB2Loop(void)
 
 		g_dc = {};
 		Z_Frame_Reset();
+		srb2::r_debug::clear_frame_list();
 
 		{
 			// Casting the return value of a function is bad practice (apparently)

src/r_debug.hpp

@@ -0,0 +1,24 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by James Robert Roman.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
+#ifndef r_debug_hpp
+#define r_debug_hpp
+
+#include "doomtype.h"
+
+namespace srb2::r_debug
+{
+
+void add_texture_to_frame_list(INT32 texnum);
+void clear_frame_list();
+void draw_frame_list();
+
+}; // namespace srb2::r_debug
+
+#endif/*r_debug_hpp*/

src/r_debug_printer.cpp

@@ -0,0 +1,67 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by James Robert Roman.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
+#include <string_view>
+#include <unordered_set>
+
+#include "r_debug.hpp"
+#include "v_draw.hpp"
+
+#include "doomdef.h"
+#include "doomtype.h"
+#include "r_textures.h"
+#include "screen.h"
+
+using srb2::Draw;
+
+namespace
+{
+
+std::unordered_set<INT32> frame_list;
+
+}; // namespace
+
+namespace srb2::r_debug
+{
+
+void add_texture_to_frame_list(INT32 texnum)
+{
+	if (cht_debug & DBG_RENDER)
+	{
+		frame_list.insert(texnum);
+	}
+}
+
+void clear_frame_list()
+{
+	frame_list.clear();
+}
+
+void draw_frame_list()
+{
+	if (!(cht_debug & DBG_RENDER))
+	{
+		return;
+	}
+
+	Draw line = Draw(4, BASEVIDHEIGHT - 20)
+		.font(Draw::Font::kConsole)
+		.scale(0.5)
+		.flags(V_ORANGEMAP | V_SNAPTOLEFT | V_SNAPTOBOTTOM);
+
+	line.y(-4 * static_cast<int>(frame_list.size() - 1)).size(32, 4 * frame_list.size()).fill(31);
+
+	for (INT32 texnum : frame_list)
+	{
+		line.text("{}", std::string_view {textures[texnum]->name, 8});
+		line = line.y(-4);
+	}
+}
+
+}; // namespace srb2::r_debug

src/r_segs.cpp

@@ -35,6 +35,7 @@
 #include "core/memory.h"
 #include "core/thread_pool.h"
 #include "k_terrain.h"
+#include "r_debug.hpp"
 
 extern "C" consvar_t cv_debugfinishline;
 
@@ -2064,7 +2065,12 @@ void R_StoreWallRange(INT32 start, INT32 stop)
 	auto get_flat_tex = [](INT32 texnum)
 	{
 		texnum = R_GetTextureNum(texnum);
-		return textures[texnum]->holes ? 0 : texnum; // R_DrawWallColumn cannot render holey textures
+		if (textures[texnum]->holes)
+		{
+			srb2::r_debug::add_texture_to_frame_list(texnum);
+			return 0; // R_DrawWallColumn cannot render holey textures
+		}
+		return texnum;
 	};
 
 	if (!backsector)