gzdoom/more-32bit.patch

From: Jan Engelhardt <ej@inai.de>
Date: Wed, 8 May 2024 13:33:41 +0200
Subject: [PATCH] build: portability fixes
References: https://github.com/ZDoom/gzdoom/pull/2562

Different architectures have different type sizes and alignments. Don't test
void* for a hardcoded size if there is not an inherent dependency on the size.
With this change, gzdoom compiles and Doom2 MAP01 runs fine on
i586-in-a-x64-chroot. This is not to say everything is known to be fine, but,
those who are running a non-x64 openSUSE system in the first place are savvy
enough to know that (a) software is never finished, (b) especially so on
second/third-tier targets.

VkSurfaceKHR is not a pointer on some platforms but an integral type.
Using {} will clear it without running into a type error:

	sdlglvideo.cpp:294:54: error: cannot convert 'std::nullptr_t' to
	'VkSurfaceKHR' {aka 'long long unsigned int'} in initialization
		VkSurfaceKHR surfacehandle = nullptr;
---
 src/CMakeLists.txt                           |    5 +++++
 src/common/engine/i_interface.cpp            |    8 --------
 src/common/models/bonecomponents.h           |    1 +
 src/common/platform/posix/sdl/sdlglvideo.cpp |    2 +-
 src/playsim/p_effect.h                       |    7 +++++--
 5 files changed, 12 insertions(+), 11 deletions(-)

Index: gzdoom-g4.13.2/src/CMakeLists.txt
===================================================================
--- gzdoom-g4.13.2.orig/src/CMakeLists.txt
+++ gzdoom-g4.13.2/src/CMakeLists.txt
@@ -44,6 +44,11 @@ if( ${TARGET_ARCHITECTURE} MATCHES "x86_
 	set( X64 64 )
 	add_definitions( -DARCH_IA32 )
 endif()
+if( ${TARGET_ARCHITECTURE} MATCHES "i386" )
+	# The production of _mm_load_si128 instructions requires flags.
+	# (This is independent of whether or not they are executed later.)
+	add_definitions( -mmmx -msse -msse2 -mfpmath=sse -DARCH_IA32 )
+endif()
 
 if( NOT PROJECT_LIBRARIES )
 	set( PROJECT_LIBRARIES "" )
Index: gzdoom-g4.13.2/src/common/engine/i_interface.cpp
===================================================================
--- gzdoom-g4.13.2.orig/src/common/engine/i_interface.cpp
+++ gzdoom-g4.13.2/src/common/engine/i_interface.cpp
@@ -6,14 +6,6 @@
 #include "gstrings.h"
 #include "version.h"
 
-static_assert(sizeof(void*) == 8,
-	"Only LP64/LLP64 builds are officially supported. "
-	"Please do not attempt to build for other platforms; "
-	"even if the program succeeds in a MAP01 smoke test, "
-	"there are e.g. known visual artifacts "
-	"<https://forum.zdoom.org/viewtopic.php?f=7&t=75673> "
-	"that lead to a bad user experience.");
-
 // Some global engine variables taken out of the backend code.
 FStartupScreen* StartWindow;
 SystemCallbacks sysCallbacks;
Index: gzdoom-g4.13.2/src/common/models/bonecomponents.h
===================================================================
--- gzdoom-g4.13.2.orig/src/common/models/bonecomponents.h
+++ gzdoom-g4.13.2/src/common/models/bonecomponents.h
@@ -43,6 +43,7 @@ struct ModelAnim
 	float framerate = 0;
 	double startFrame = 0;
 	int flags = MODELANIM_NONE;
+	int __padding = 0;
 	double startTic = 0; // when the current animation started (changing framerates counts as restarting) (or when animation starts if interpolating from previous animation)
 	double switchOffset = 0; // when the animation was changed -- where to interpolate the switch from
 };
Index: gzdoom-g4.13.2/src/common/platform/posix/sdl/sdlglvideo.cpp
===================================================================
--- gzdoom-g4.13.2.orig/src/common/platform/posix/sdl/sdlglvideo.cpp
+++ gzdoom-g4.13.2/src/common/platform/posix/sdl/sdlglvideo.cpp
@@ -400,7 +400,7 @@ DFrameBuffer *SDLVideo::CreateFrameBuffe
 				builder.RequireExtension(names[i]);
 			auto instance = builder.Create();
 
-			VkSurfaceKHR surfacehandle = nullptr;
+			VkSurfaceKHR surfacehandle = {};
 			if (!I_CreateVulkanSurface(instance->Instance, &surfacehandle))
 				VulkanError("I_CreateVulkanSurface failed");
 
Index: gzdoom-g4.13.2/src/playsim/p_effect.h
===================================================================
--- gzdoom-g4.13.2.orig/src/playsim/p_effect.h
+++ gzdoom-g4.13.2/src/playsim/p_effect.h
@@ -75,7 +75,10 @@ enum EParticleFlags
 class DVisualThinker;
 struct particle_t
 {
-	subsector_t* subsector; //+8 = 8
+	union {
+		subsector_t* subsector;
+		uint64_t _pad0; //+8 = 8
+	};
     DVector3 Pos; //+24 = 32
     FVector3 Vel; //+12 = 44
     FVector3 Acc; //+12 = 56
@@ -88,7 +91,7 @@ struct particle_t
     float Roll, RollVel, RollAcc; //+12 = 100
     uint16_t    tnext, snext, tprev; //+6 = 106
 	uint16_t flags; //+2 = 108
-	// uint32_t padding; //+4 = 112
+	uint32_t padding; //+4 = 112
 	FStandaloneAnimation animData; //+16 = 128
 };