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diff --git a/source/x/vulkan-sdk/fetch-sources.sh b/source/x/vulkan-sdk/fetch-sources.sh
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+#!/bin/sh
+
+# Copyright 2017 Patrick J. Volkerding, Sebeka, Minnesota, USA
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Call this script with the version of the Vulkan-LoaderAndValidationLayers-sdk
+# that you would like to fetch the sources for. This will fetch the SDK from
+# github, and then look at the revisions listed in the external_revisions
+# directory to fetch the proper glslang, SPIRV-Headers, and SPIRV-Tools.
+#
+# Example: VERSION=1.1.70.0 ./fetch-sources.sh
+
+VERSION=${VERSION:-1.1.70.0}
+
+# Remove existing sources:
+rm -rf Vulkan-LoaderAndValidationLayers-sdk* glslang-* SPIRV-Headers-* SPIRV-Tools-*
+
+# Fetch SDK:
+lftpget https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/archive/sdk-${VERSION}/Vulkan-LoaderAndValidationLayers-sdk-${VERSION}.tar.gz
+
+GLSLANG_REVISION=$(tar xOf Vulkan-LoaderAndValidationLayers-sdk-${VERSION}.tar.gz Vulkan-LoaderAndValidationLayers-sdk-${VERSION}/external_revisions/glslang_revision)
+
+git clone https://github.com/KhronosGroup/glslang.git glslang-$GLSLANG_REVISION
+cd glslang-$GLSLANG_REVISION
+git checkout $GLSLANG_REVISION
+SPIRV_TOOLS_REVISION=$(
+python3 - << EOF
+import json
+with open('known_good.json') as f:
+ known_good = json.load(f)
+commits = known_good['commits']
+print(commits[0]['commit'])
+EOF
+)
+SPIRV_HEADERS_REVISION=$(
+python3 - << EOF
+import json
+with open('known_good.json') as f:
+ known_good = json.load(f)
+commits = known_good['commits']
+print(commits[1]['commit'])
+EOF
+)
+# Cleanup. We're not packing up the whole git repo.
+find . -type d -name ".git*" -exec rm -rf {} \; 2> /dev/null
+cd ..
+tar cf glslang-${GLSLANG_REVISION}.tar glslang-${GLSLANG_REVISION}
+rm -rf glslang-${GLSLANG_REVISION}
+plzip -9 glslang-${GLSLANG_REVISION}.tar
+
+git clone https://github.com/KhronosGroup/SPIRV-Headers.git SPIRV-Headers-${SPIRV_HEADERS_REVISION}
+cd SPIRV-Headers-${SPIRV_HEADERS_REVISION}
+git checkout ${SPIRV_HEADERS_REVISION}
+# Cleanup. We're not packing up the whole git repo.
+find . -type d -name ".git*" -exec rm -rf {} \; 2> /dev/null
+cd ..
+tar cf SPIRV-Headers-${SPIRV_HEADERS_REVISION}.tar SPIRV-Headers-${SPIRV_HEADERS_REVISION}
+rm -rf SPIRV-Headers-${SPIRV_HEADERS_REVISION}
+plzip -9 SPIRV-Headers-${SPIRV_HEADERS_REVISION}.tar
+
+git clone https://github.com/KhronosGroup/SPIRV-Tools.git SPIRV-Tools-${SPIRV_TOOLS_REVISION}
+cd SPIRV-Tools-${SPIRV_TOOLS_REVISION}
+git checkout ${SPIRV_TOOLS_REVISION}
+# Only purge the .pack, since spirv_tools_commit_id.h needs to query the repo:
+rm -f .git/objects/pack/pack-*.pack
+cd ..
+tar cf SPIRV-Tools-${SPIRV_TOOLS_REVISION}.tar SPIRV-Tools-${SPIRV_TOOLS_REVISION}
+rm -rf SPIRV-Tools-${SPIRV_TOOLS_REVISION}
+plzip -9 SPIRV-Tools-${SPIRV_TOOLS_REVISION}.tar
+
+# Repack Vulkan-LoaderAndValidationLayers-sdk:
+gzip -d Vulkan-LoaderAndValidationLayers-sdk-${VERSION}.tar.gz
+plzip -9 Vulkan-LoaderAndValidationLayers-sdk-${VERSION}.tar
+
+# List URLs in vulkan-sdk.url:
+echo "https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/archive/sdk-${VERSION}/Vulkan-LoaderAndValidationLayers-sdk-${VERSION}.tar.gz" > vulkan-sdk.url
+echo "https://github.com/KhronosGroup/glslang/archive/${GLSLANG_REVISION}/glslang-${GLSLANG_REVISION}.tar.gz" >> vulkan-sdk.url
+echo "https://github.com/KhronosGroup/SPIRV-Headers/archive/${SPIRV_HEADERS_REVISION}/SPIRV-Headers-${SPIRV_HEADERS_REVISION}.tar.gz" >> vulkan-sdk.url
+echo "https://github.com/KhronosGroup/SPIRV-Tools/archive/${SPIRV_TOOLS_REVISION}/SPIRV-Tools-${SPIRV_TOOLS_REVISION}.tar.gz" >> vulkan-sdk.url
+
+# Fix timestamps to be correct:
+for file in *.tar.?z ; do
+ TIMESTAMP="$(tar tvf $file | head -1 | cut -b 32-47)"
+ touch -d "$TIMESTAMP" $file
+done