#! /bin/bash

# Mesa without Xorg
# Source: ftp://ftp.freedesktop.org/pub/mesa/mesa-21.3.3.tar.xz
#
# $BUILD = Directory to temporarily install
# $PKGS  = Directory to store built packages
#
# DEPS
# Required:     LLVM, libdrm, Mako
# Recommended:  Libva, libvdpau(for Xorg), wayland-protocols
# Optional:     libgcrypt, lm-sensors, nettle, valgrind, libunwind, glslang (for vulkan layers)

# Apply patches from Alpine Linux
patch -Np1 -i ../patches/mesa-alpine-21.2.1/0001-radeonsi-On-Aarch64-force-persistent-buffers-to-GTT.patch
patch -Np1 -i ../patches/mesa-alpine-21.2.1/add-use-elf-tls.patch
patch -Np1 -i ../patches/mesa-alpine/disable-rgb10-by-default.patch # patch needs update
patch -Np1 -i ../patches/mesa-alpine-21.2.1/musl-fix-includes.patch

# If optimizing, use these flags
# LTO is not recommended
export  CFLAGS="-march=native -mtune=native "
export CFLAGS+="-Ofast -falign-functions=32 -fno-lto "
export CFLAGS+="-fno-semantic-interposition -mprefer-vector-width=256 "
export CXXFLAGS=$CFLAGS
unset LDFLAGS

export CFLAGS="$CFLAGS -D_XOPEN_SOURCE=700" &&
case $(uname -m) in
	i686|x86_64) export GLL_DRV="i915,nouveau,radeonsi,svga,swrast,r600,iris,crocus" 
                     export DRI_DRIVERS="i965,nouveau" 
		     export V_DRIVERS="amd,swrast,intel" ;;
	     arm*)   export GLL_DRV="vc4,panfrost,nouveau,tegra,swrast"
		     export DRI_DRIVEiRS="nouveau" 
		     export V_DRIVERS="" ;;
esac

# Set configure flags
export  BUILDOPT="-Dbuildtype=release "
export BUILDOPT+="-Dllvm=enabled "
export BUILDOPT+="-Dshared-llvm=enabled "
export BUILDOPT+="-Dosmesa=true "
export BUILDOPT+="-Dtools= "
export BUILDOPT+="-Dvalgrind=false "

export  GFXOPT="-Dglx=disabled "
export GFXOPT+="-Dglx-read-only-text=true "
export GFXOPT+="-Dxlib-lease=disabled "
export GFXOPT+="-Ddri3=enabled "
export GFXOPT+="-Dopengl=true "
export GFXOPT+="-Degl=enabled "
export GFXOPT+="-Dgles2=enabled "
export GFXOPT+="-Dgles1=enabled "
export GFXOPT+="-Dshared-glapi=enabled "

export  DRVROPT="-Dplatforms=wayland "
export DRVROPT+="-Degl-native-platform=wayland "

export  GALLIUMOPT="-Dgallium-va=disabled "
export GALLIUMOPT+="-Dgallium-xa=false "
export GALLIUMOPT+="-Dgallium-xvmc=false "
export GALLIUMOPT+="-Dgallium-nine=false "
export GALLIUMOPT+="-Dgallium-vdpau=disabled "

# For intel graphics only (i.e. intergrated graphics on some laptops)
# then only enable these drivers:
export DRI_DRIVERS="i965"
export GLL_DRV="i915,svga,swrast,iris,crocus"
export V_DRIVERS="swrast,intel"

# If glslang is installed, vulkan layers an be built
export V_LAYERS="-Dvulkan-layers=device-select,overlay,intel-nullhw "

export MESA_GIT_SHA1_OVERRIDE=53b2b224dc2de982c37915a0ad218e33365ff75e &&
python3 bin/git_sha1_gen.py --output include/git_sha1.h &&

meson --prefix=/usr \
      -Dvulkan-drivers="${V_DRIVERS}" \
      -Ddri-drivers="${DRI_DRIVERS}" \
      -Dgallium-drivers="${GLL_DRV}" \
      $BUILDOPT $GFXOPT $DRVROPT $GALLIUMOPT $V_LAYERS OUT  

read -p "Compile?" && ninja -C OUT -j2 &&

sudo -S DESTDIR=$BUILD ninja -C OUT install &&
unset CFLAGS GLL_DRV DRI_DRIVERS MESA_GIT_SHA1_OVERRIDE V_DRIVERS &&
unset BUILDOPT GFXOPT DRVROPT GALLIUMOPT V_LAYERS

cd $BUILD && sudo -S mkdir -v ${BUILD}/install &&
cat > /tmp/slack-desc << "EOF"
# HOW TO EDIT THIS FILE:
# The "handy ruler" below makes it easier to edit a package description.  Line
# up the first '|' above the ':' following the base package name, and the '|'
# on the right side marks the last column you can put a character in.  You must
# make exactly 11 lines for the formatting to be correct.  It's also
# customary to leave one space after the ':' except on otherwise blank lines.

    |-----handy-ruler------------------------------------------------------|
mesa: mesa (a 3-D graphics library)
mesa:
mesa: Mesa is a 3-D graphics library with an API very similar to that of
mesa: another well-known 3-D graphics library. The Mesa libraries are used
mesa: by X to provide both software and hardware accelerated graphics.
mesa:
mesa: Mesa was written by Brian Paul.
mesa:
mesa: Homepage: https://www.mesa3d.org
mesa:
mesa: Tailored without Xorg Libraries
EOF
sudo -S mv -v /tmp/slack-desc install/ &&
sudo -S makepkg -l y -c n $PKGS/mesa-21.3.3_nox-$(uname -m)-mlfs.txz &&
sudo -S rm -rf ${BUILD}/*