6 files changed, 212 insertions, 0 deletions
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
new file mode 100644
index 000000000..e61db9921
--- /dev/null
+++ b/external/CMakeLists.txt
@@ -0,0 +1,78 @@
+# Don't let all these packages spam up with status messages, filter to only the
+# important stuff.
+# Don't change things however if the user has explicitly set
+# CMAKE_MESSAGE_LOG_LEVEL
+set(set_cmake_log_level FALSE)
+if(NOT CMAKE_MESSAGE_LOG_LEVEL)
+    set(set_cmake_log_level TRUE)
+    set(CMAKE_MESSAGE_LOG_LEVEL NOTICE)
+endif()
+
+# Miniz
+add_subdirectory(miniz EXCLUDE_FROM_ALL)
+set_property(TARGET miniz PROPERTY POSITION_INDEPENDENT_CODE ON)
+# Work around https://github.com/richgel999/miniz/pull/292
+get_target_property(miniz_c_launcher miniz C_COMPILER_LAUNCHER)
+if(MSVC AND miniz_c_launcher MATCHES "ccache")
+    set_property(TARGET miniz PROPERTY C_COMPILER_LAUNCHER)
+    set_property(TARGET miniz PROPERTY MSVC_DEBUG_INFORMATION_FORMAT "")
+endif()
+
+# LZ4
+set(LZ4_BUNDLED_MODE ON)
+add_subdirectory(lz4/build/cmake EXCLUDE_FROM_ALL)
+if(MSVC)
+    target_compile_options(
+        lz4_static
+        PRIVATE /wd5045 /wd4820 /wd4711 /wd6385 /wd6262
+    )
+endif()
+
+# Vulkan headers
+add_subdirectory(vulkan EXCLUDE_FROM_ALL)
+
+# SPIRV-Headers
+add_subdirectory(spirv-headers EXCLUDE_FROM_ALL)
+
+# SPIRV-Tools
+set(SPIRV_TOOLS_BUILD_STATIC ON)
+set(SPIRV_WERROR OFF)
+set(SPIRV_HEADER_DIR "${CMAKE_CURRENT_LIST_DIR}/spirv-headers/")
+set(SPIRV_SKIP_TESTS ON)
+add_subdirectory(spirv-tools EXCLUDE_FROM_ALL)
+
+# glslang
+set(SKIP_GLSLANG_INSTALL ON)
+set(ENABLE_OPT ON)
+set(ENABLE_PCH OFF)
+add_subdirectory(glslang EXCLUDE_FROM_ALL)
+
+# imgui
+add_library(imgui INTERFACE)
+target_include_directories(imgui INTERFACE "${CMAKE_CURRENT_LIST_DIR}/imgui")
+
+# Tidy things up:
+
+# Restore log level if we set it
+if(set_cmake_log_level)
+    unset(CMAKE_MESSAGE_LOG_LEVEL)
+endif()
+
+# for this directory and all subdirectories, prepend
+# `external/` to the IDE FOLDER property to every target
+function(make_external dir)
+    get_property(external_targets DIRECTORY ${dir} PROPERTY BUILDSYSTEM_TARGETS)
+    foreach(external_target ${external_targets})
+        get_property(folder TARGET ${external_target} PROPERTY FOLDER)
+        set_property(
+            TARGET ${external_target}
+            PROPERTY FOLDER "external/${folder}"
+        )
+    endforeach()
+
+    get_property(subdirs DIRECTORY ${dir} PROPERTY SUBDIRECTORIES)
+    foreach(subdir ${subdirs})
+        make_external(${subdir})
+    endforeach()
+endfunction()
+make_external(.)
diff --git a/external/build-llvm.sh b/external/build-llvm.sh
new file mode 100755
index 000000000..a01158e78
--- /dev/null
+++ b/external/build-llvm.sh
@@ -0,0 +1,134 @@
+#!/usr/bin/env bash
+
+set -e
+
+help() {
+  me=$(basename "$0")
+  cat <<EOF
+$me: Fetch, build and install LLVM for Slang
+
+Options:
+  --repo: The source git repo, default: $repo
+  --branch: The branch (or tag) to fetch, default: $branch
+  --source-dir: Unpack and build in this directory: default $source_dir
+  --config: The configuration to build, default $config
+  --install-prefix: Install under this prefix
+  --: Any following arguments will be passed to the CMake configuration command
+EOF
+}
+
+#
+# Some helper functions
+#
+msg(){
+  printf "%s\n" "$1" >&2
+}
+
+fail() {
+  msg "$1"
+  exit 1
+}
+
+for prog in "cmake" "ninja" "git"; do
+  if ! command -v "$prog" &>/dev/null; then
+    msg "This script needs $prog, but it isn't in \$PATH"
+    missing_bin=1
+  fi
+done
+if [ "$missing_bin" ]; then
+  exit 1
+fi
+
+#
+# Temp dir with cleanup on exit
+#
+temp_dir=$(mktemp -d)
+cleanup() {
+  local exit_status=$?
+  rm -rf "$temp_dir"
+  exit $exit_status
+}
+trap cleanup EXIT SIGHUP SIGINT SIGTERM
+
+#
+# Options and parsing
+#
+repo=https://github.com/llvm/llvm-project
+branch=llvmorg-13.0.1
+source_dir=$temp_dir
+install_prefix=
+config=Release
+extra_arguments=()
+
+while [[ "$#" -gt 0 ]]; do
+  case $1 in
+  -h | --help) help; exit ;;
+  --repo) repo=$2; shift;;
+  --branch) branch=$2; shift;;
+  --source-dir) source_dir=$2; shift;;
+  --config) config=$2; shift;;
+  --install-prefix) install_prefix=$2; shift;;
+  --) shift; extra_arguments+=("$@"); break;;
+  *)
+    msg "Unknown parameter passed: $1"
+    help >&2
+    exit 1
+    ;;
+  esac
+  shift
+done
+
+[ -n "$repo" ] || fail "please set --repo"
+[ -n "$branch" ] || fail "please set --branch"
+[ -n "$source_dir" ] || fail "please set --source-dir"
+[ -n "$config" ] || fail "please set --config"
+[ -n "$install_prefix" ] || fail "please set --install-prefix"
+
+msg "##########################################################"
+msg "# Fetching LLVM from $repo at $branch"
+msg "##########################################################"
+git -c advice.detachedHead=false clone "$repo" --branch "$branch" "$source_dir" --depth 1
+
+msg "##########################################################"
+msg "# Configuring LLVM in $source_dir"
+msg "##########################################################"
+cmake_arguments_for_slang=(
+  # Don't build unnecessary things
+  -DLLVM_BUILD_LLVM_C_DYLIB=0
+  -DLLVM_INCLUDE_BENCHMARKS=0
+  -DLLVM_INCLUDE_DOCS=0
+  -DLLVM_INCLUDE_EXAMPLES=0
+  -DLLVM_INCLUDE_TESTS=0
+  -DLLVM_ENABLE_TERMINFO=0
+  -DCLANG_BUILD_TOOLS=0
+  -DCLANG_ENABLE_STATIC_ANALYZER=0
+  -DCLANG_ENABLE_ARCMT=0
+  -DCLANG_INCLUDE_DOCS=0
+  -DCLANG_INCLUDE_TESTS=0
+  # Requirements for Slang
+  -DLLVM_ENABLE_PROJECTS=clang
+  "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64"
+  -DLLVM_BUILD_TOOLS=1
+)
+build_dir=$source_dir/build
+mkdir -p "$build_dir"
+cmake \
+  -S "$source_dir/llvm" -B "$build_dir" \
+  -G "Ninja Multi-Config" \
+  "${cmake_arguments_for_slang[@]}" \
+  "${extra_arguments[@]}"
+
+msg "##########################################################"
+msg "# Building LLVM in $build_dir"
+msg "##########################################################"
+cmake --build "$build_dir" -j --config "$config"
+
+msg "##########################################################"
+msg "# Installing LLVM to $install_prefix"
+msg "##########################################################"
+cmake --install "$build_dir" --prefix "$install_prefix" --config "$config"
+
+msg "##########################################################"
+msg "LLVM installed in $install_prefix"
+msg "Please add $install_prefix to CMAKE_PREFIX_PATH"
+msg "##########################################################"
diff --git a/external/imgui b/external/imgui
-Subproject fd2a90ee60c1b766af5a5ae167f38d601414141
+Subproject 3c15dffc944419eb4bb17984548468270ca9048
diff --git a/external/lz4 b/external/lz4
-Subproject d44371841a2f1728a3f36839fd4b7e872d0927d
+Subproject 039ab4696526378ec0d111058b48305964284bf
diff --git a/external/miniz b/external/miniz
-Subproject a4264837ae37384b1d7a205a6732db322f0f376
+Subproject 18795fa61e590521381ba9e1fa4a4ab362b095f
diff --git a/external/spirv-tools b/external/spirv-tools
-Subproject 8994351e58e45e1f067733966628383c50341de
+Subproject 866e60defc05326c5cf0ad711ec453dd25e6ede