SPIRV-Cross/checkout_glslang_spirv_tool...

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#!/bin/bash
GLSLANG_REV=845860d56513d95e15fe4820df7272f9687d076e
SPIRV_TOOLS_REV=340370eddbb9f0e7d26b6a4f7e22c1b98150e5e1
if [ -d external/glslang ]; then
echo "Updating glslang to revision $GLSLANG_REV."
cd external/glslang
git fetch origin
git checkout $GLSLANG_REV
else
echo "Cloning glslang revision $GLSLANG_REV."
mkdir -p external
cd external
git clone git://github.com/KhronosGroup/glslang.git
cd glslang
git checkout $GLSLANG_REV
fi
cd ../..
if [ -d external/spirv-tools ]; then
echo "Updating SPIRV-Tools to revision $SPIRV_TOOLS_REV."
cd external/spirv-tools
git fetch origin
git checkout $SPIRV_TOOLS_REV
else
echo "Cloning SPIRV-Tools revision $SPIRV_TOOLS_REV."
mkdir -p external
cd external
git clone git://github.com/KhronosGroup/SPIRV-Tools.git spirv-tools
cd spirv-tools
git checkout $SPIRV_TOOLS_REV
fi
if [ -d external/spirv-headers ]; then
cd external/spirv-headers
git pull origin master
cd ../..
else
git clone git://github.com/KhronosGroup/SPIRV-Headers.git external/spirv-headers
fi
cd ../..