#! /bin/bash

# Mesa with Xorg
# Source: https://mesa.freedesktop.org/archive/mesa-24.0.8.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, libglvnd, spirv-headers
# Optional:     libgcrypt, lm-sensors, nettle, valgrind, libunwind, vulkan-headers (vulkan support/driver)
# Optional:     vulkan-loader (vulkan support), libclc(vulkan-support), libxcb(for Xorg), libX11(for Xorg)
# Optional:     libxshmfence(for Xorg), libXxf86vm(for Xorg), libXrandr(for Xorg), DirectX-headers

# As of version 22.x.x, Mesa's classic OpenGL drivers (non-Gallium3D) have been removed. These are the
# old Radeon R100 and R200 drivers, the original Nouveau code, and the Intel i915 and i965 drivers.
# More info at https://www.phoronix.com/scan.php?page=news_item&px=Mesa-Classic-Retired

# Apply patches from Chimera Linux... patches for 23.3.4 also pply to 24.0.8
patch -Np1 -i ../patches/mesa-23.3.4-chimera/0001-radeonsi-On-Aarch64-force-persistent-buffers-to-GTT.patch 
patch -Np1 -i ../patches/mesa-23.3.4-chimera/disable-ppc64-asm.patch
#patch -Np1 -i ../patches/mesa-23.3.4-chimera/fix-meson-build.patch 
patch -Np1 -i ../patches/mesa-23.3.4-chimera/musl-endian.patch 
patch -Np1 -i ../patches/mesa-23.3.4-chimera/musl-stacksize.patch 
patch -Np1 -i ../patches/mesa-23.3.4-chimera/musl.patch 
patch -Np1 -i ../patches/mesa-23.3.4-chimera/no-unlink-megadrivers.patch
patch -Np1 -i ../patches/mesa-23.3.4-chimera/vec-clang.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 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,intel_hasvk" ;;
	     arm*)   export GLL_DRV="vc4,panfrost,nouveau,tegra,swrast"
		     #export DRI_DRIVERS="nouveau" 
		     export V_DRIVERS="swrast" ;;
esac

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

export  GFXOPT="-Dglx=dri "
export GFXOPT+="-Dglx-read-only-text=true "
export GFXOPT+="-Dxlib-lease=enabled "
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="-Degl-native-platform=wayland "

export  GALLIUMOPT="-Dgallium-va=enabled "
export GALLIUMOPT+="-Dgallium-xa=enabled "
export GALLIUMOPT+="-Dgallium-nine=true "
export GALLIUMOPT+="-Dgallium-vdpau=enabled "

# if libclc is installed:
#export  XTRA_OPTS="-Dgallium-opencl=icd " 
# Option breaks build.

# if libglvnd is installed
export XTRA_OPTS="-Dglvnd=true "
# if spirv-llvm-translator is installed:
export XTRA_OPTS+="-Dopencl-spirv=true -Dspirv-to-dxil=true "
# if video codec are desired:
export XTRA_OPTS+="-Dvideo-codecs=all "

# Classic OpenGL drivers, such as the i965/i915, were retired to amber branch
# Crocus driver will handle i965 chipsets
#export XTRA_OPTS+="-Dprefer-crocus=true "
#export XTRA_OPTS+="-Ddri-drivers=\"${DRI_DRIVERS}\" "

# 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,d3d12"
export V_DRIVERS="swrast,intel"

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

# If compiling with clang-17, add flag:
LDFLAGS="-Wl,--undefined-version" \
meson setup --prefix=/usr -Dvulkan-drivers="${V_DRIVERS}" \
      -Dgallium-drivers="${GLL_DRV}" \
      -Dplatforms=wayland,x11 -Dtools=glsl \
      $BUILDOPT $GFXOPT $DRVROPT $GALLIUMOPT $V_LAYERS  $XTRA_OPTS OUT

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

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

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:
EOF
sudo -S mv -v /tmp/slack-desc install/ &&
sudo -S makepkg -l y -c n $PKGS/mesa-24.0.8-$PSUFFIX &&
sudo -S rm -rf ${BUILD}/*