dos: Switch to dos-vbe-rebase branch

Also cleans up dos-prep.sh and adds a bit of logging to display.cpp

Packaging/windows/dos-prep.sh

@@ -2,6 +2,8 @@
 
 set -euo pipefail
 
+INSTALL_PREFIX=/opt/i386-pc-msdosdjgpp-toolchain
+
 # only use sudo when necessary
 if [ `id -u` -ne 0 ]; then
 	SUDO=sudo
@@ -10,40 +12,44 @@ else
 fi
 
 # Install dependencies on Debian / Ubuntu:
-if which apt-get 2>/dev/null; then
-	set -x
-	$SUDO apt-get update
-	$SUDO apt-get install bison flex curl gcc g++ make texinfo zlib1g-dev tar bzip2 \
-		gzip xz-utils unzip python3-dev m4 dos2unix nasm cmake
-	{ set +x; } 2>/dev/null
-fi
-
-INSTALL_PREFIX=/opt/i386-pc-msdosdjgpp-toolchain
-
-set -x
-mkdir -p tmp/dos-prep
-cd tmp/dos-prep
+install_system_deps() {
+	if which apt-get 2>/dev/null; then
+		set -x
+		$SUDO apt-get update
+		$SUDO apt-get install bison flex curl gcc g++ make texinfo zlib1g-dev tar bzip2 \
+			gzip xz-utils unzip python3-dev m4 dos2unix nasm cmake
+		{ set +x; } 2>/dev/null
+	fi
+}
 
 # Build and install DJGPP
-git clone https://github.com/jwt27/build-gcc.git
-cd build-gcc
-$SUDO ./build-djgpp.sh --prefix="$INSTALL_PREFIX" --batch binutils gcc-14.2.0 djgpp-cvs
-cd -
-$SUDO rm -rf build-gcc
-
-# Activate DJGPP environment
-{ set +x; } 2>/dev/null
-set +eu
-source "${INSTALL_PREFIX}/bin/i386-pc-msdosdjgpp-setenv"
-set -eu
-set -x
+build_and_install_djgpp() {
+	git clone https://github.com/jwt27/build-gcc.git
+	cd build-gcc
+	$SUDO ./build-djgpp.sh --prefix="$INSTALL_PREFIX" --batch binutils gcc-14.2.0 djgpp-cvs
+	cd -
+	$SUDO rm -rf build-gcc
+}
 
 # Build and install SDL2 for DOS
-git clone --branch=dos-vbe https://github.com/diasurgical/SDL.git
-cd SDL
-autoreconf -fi
-./configure --host=i386-pc-msdosdjgpp --prefix="${INSTALL_PREFIX}/i386-pc-msdosdjgpp" --disable-shared --enable-static --enable-video-svga --enable-timer-dos --enable-uclock
-make -j$(nproc)
-$SUDO "${INSTALL_PREFIX}/bin/i386-pc-msdosdjgpp-setenv" make install
-cd -
-rm -rf SDL
+build_and_install_sdl2() {
+	git clone --branch=dos-vbe-rebase https://github.com/diasurgical/SDL.git
+	cd SDL
+	"${INSTALL_PREFIX}/bin/i386-pc-msdosdjgpp-setenv" autoreconf -fi --verbose
+	"${INSTALL_PREFIX}/bin/i386-pc-msdosdjgpp-setenv" ./configure --host=i386-pc-msdosdjgpp --prefix="${INSTALL_PREFIX}/i386-pc-msdosdjgpp" --disable-shared --enable-static --enable-video-svga --enable-timer-dos --enable-uclock
+	"${INSTALL_PREFIX}/bin/i386-pc-msdosdjgpp-setenv" make -j$(nproc)
+	$SUDO "${INSTALL_PREFIX}/bin/i386-pc-msdosdjgpp-setenv" make install
+	cd -
+	rm -rf SDL
+}
+
+main() {
+	set -x
+	mkdir -p tmp/dos-prep
+	cd tmp/dos-prep
+	install_system_deps
+	build_and_install_djgpp
+	build_and_install_sdl2
+}
+
+main "$@"

Source/utils/display.cpp

@@ -130,6 +130,12 @@ SDL_DisplayMode GetNearestDisplayMode(Size preferredSize)
 		nearestDisplayMode = displayMode;
 	}
 
+	LogVerbose("Nearest display mode to {}x{} is {}x{} {}bpp {}Hz",
+	    preferredSize.width, preferredSize.height,
+	    nearestDisplayMode.w, nearestDisplayMode.h,
+	    SDL_BITSPERPIXEL(nearestDisplayMode.format),
+	    nearestDisplayMode.refresh_rate);
+
 	return nearestDisplayMode;
 }
 #endif