Update to Vulkan SDK 1.2.135 library dependencies.

Add Scripts/packagePregenSpirvToolsHeaders script to automate packaging Spirv-Tools
headers in support of the fetchDependencies --skip-spirv-tools-build option.
Update Docs/Whats_New.md.

Docs/Whats_New.md

@@ -17,7 +17,7 @@ For best results, use a Markdown reader.*
 MoltenVK 1.0.41
 ---------------
 
-Released 2020/03/30
+Released 2020/04/05
 
 - Accurately populate Vulkan `VkFormatProperties` from `MTLPixelFormat` capabilities, 
   taking into consideration variations across `MTLDevice` Features Sets.
@@ -29,6 +29,7 @@ Released 2020/03/30
 - Add ability to disable command memory pooling using `MVK_CONFIG_USE_COMMAND_POOLING`
   environment variable.
 - Fix memory leak when pre-filling `MTLCommandBuffers` using `MVK_CONFIG_PREFILL_METAL_COMMAND_BUFFERS`.
+- Fix issue causing screen captures from swapchain image to deadlock.
 - Broaden conditions for host read sync for image memory barriers on macOS.
 - Update the `README.md` and `MoltenVK_Runtime_UserGuide.md` documents to clarify that 
   **MoltenVK** is not a fully-compliant implementation of *Vulkan*.
@@ -37,6 +38,7 @@ Released 2020/03/30
 - Update to latest SPIRV-Cross version:
 	- MSL: Support inline uniform blocks in argument buffers.
 	- MSL: Move inline uniform blocks to the end of the argument buffer.
+	- MSL: Fix access chain for deep struct hierarchy on array of buffers.
 	- MSL: Remove old memory_scope flag from iOS barriers.
 	- MSL: Fixes to array handling.
 

ExternalRevisions/README.md

@@ -180,17 +180,7 @@ library. However, after updating the version of *glslang* (which adds *SPIRV-Too
 as described [above](#updating), if you encounter any building errors, you may need to re-add 
 the *SPIRV-Tools* library to the `ExternalDependencies` *Xcode* project as follows:
 
-1. In the *Project Navigator*, remove the *Group* named `source` from under the *Group* named
-   `External/SPIRV-Tools`.
-
-2. Drag the `External/glslang/External/spirv-tools/source` file folder to the `External/SPIRV-Tools` 
-   group in the *Project Navigator* panel. In the _**Choose options for adding these files**_ dialog 
-   that opens, select the _**Create groups**_ option, add the files to *both* the `SPIRV-Tools-macOS` 
-   and `SPIRV-Tools-iOS` targets, and click the ***Finish*** button.
-
-3. Remove the *Group* named `fuzz` from under the *Group* named `External/SPIRV-Tools/source`.
-
-4. In the *Project Navigator* panel, select the `ExternalDependencies` *Xcode* project, then 
+1. In the *Project Navigator* panel, select the `ExternalDependencies` *Xcode* project, then 
    select the `SPIRV-Tools-macOS` target, and open the *Build Settings* tab. Locate the build 
    setting entry **Header Search Paths** (`HEADER_SEARCH_PATHS`) and add the following paths:
 
@@ -200,11 +190,21 @@ the *SPIRV-Tools* library to the `ExternalDependencies` *Xcode* project as follo
 		"$(SRCROOT)/External/glslang/External/spirv-tools/external/spirv-headers/include"
 		"$(SRCROOT)/External/glslang/External/spirv-tools/build"
 
-5. Repeat *Step 4* for the `SPIRV-Tools-iOS` target within the `ExternalDependencies` *Xcode* project
+2. Repeat *Step 1* for the `SPIRV-Tools-iOS` target within the `ExternalDependencies` *Xcode* project
 
-6. Update `Templates/spirv-tools/build.zip` from the `*.h` and `*.inc` files in 
-   `External/glslang/External/spirv-tools/build`, remove hidden `.*` files, and test 
-   by running `./fetchDependencies --skip-spirv-tools-build`, and a **MoltenVK** build.
+3. In the *Project Navigator*, remove the *Group* named `source` from under the *Group* named
+   `External/SPIRV-Tools`.
+
+4. Drag the `External/glslang/External/spirv-tools/source` file folder to the `External/SPIRV-Tools` 
+   group in the *Project Navigator* panel. In the _**Choose options for adding these files**_ dialog 
+   that opens, select the _**Create groups**_ option, add the files to *both* the `SPIRV-Tools-macOS` 
+   and `SPIRV-Tools-iOS` targets, and click the ***Finish*** button.
+
+5. Remove the *Group* named `fuzz` from under the *Group* named `External/SPIRV-Tools/source`.
+
+6. In the `Scripts` folder, run `./packagePregenSpirvToolsHeaders` to update `Templates/spirv-tools/build.zip` 
+   from the `*.h` and `*.inc` files in `External/glslang/External/spirv-tools/build`, and test by running 
+   `./fetchDependencies --skip-spirv-tools-build`, and a **MoltenVK** build.
 
 
 
@@ -217,10 +217,19 @@ library. However, after updating the version of *glslang*, as described [above](
 if you encounter any building errors, you may need to re-add the *glslang* library to the
 `ExternalDependencies` *Xcode* project as follows:
 
-1. In the *Project Navigator*, remove all *Groups* from under the *Group* named
+1. In the *Project Navigator* panel, select the `ExternalDependencies` *Xcode* project, then 
+   select the `glslang-macOS` target, and open the *Build Settings* tab. Locate the build 
+   setting entry **Header Search Paths** (`HEADER_SEARCH_PATHS`) and add the following paths:
+
+		$(inherited) 
+		"$(SRCROOT)/External/glslang"
+
+2. Repeat *Step 1* for the `glslang-iOS` target within the `ExternalDependencies` *Xcode* project
+
+3. In the *Project Navigator*, remove all *Groups* from under the *Group* named
    `External/glslang`.
 
-2. Drag the following folders from the `External/glslang` file folder to the `External/glslang` 
+4. Drag the following folders from the `External/glslang` file folder to the `External/glslang` 
    *Group* in the *Project Navigator* panel:
 
 		glslang
@@ -230,19 +239,11 @@ if you encounter any building errors, you may need to re-add the *glslang* libra
    In the ***Choose options for adding these files*** dialog that opens, select the ***Create groups*** option, 
    add the files to *both* the `glslang-macOS` and `glslang-iOS` targets, and click the ***Finish*** button.
 
-3. In the *Project Navigator* panel, remove the references to the following files and folders:
+5. In the *Project Navigator* panel, remove the references to the following files and folders:
 
 		External/glslang/glslang/MachineIndependant/glslang.y
 		External/glslang/glslang/OSDependent/Windows
 
 
-4. In the *Project Navigator* panel, select the `ExternalDependencies` *Xcode* project, then 
-   select the `glslang-macOS` target, and open the *Build Settings* tab. Locate the build 
-   setting entry **Header Search Paths** (`HEADER_SEARCH_PATHS`) and add the following paths:
-
-		$(inherited) 
-		"$(SRCROOT)/External/glslang"
-
-5. Repeat *Step 4* for the `glslang-iOS` target within the `ExternalDependencies` *Xcode* project
 
 

ExternalRevisions/SPIRV-Cross_repo_revision

@@ -1 +1 @@
-9b3c5e12be12c55533f3bd3ab9cc617ec0f393d8
+e58e8d5dbe03ea2cc755dbaf43ffefa1b8d77bef

ExternalRevisions/Vulkan-Tools_repo_revision

@@ -1 +1 @@
-4792a6854238ba3f6d10b8c7fcd11c102cae4ca6
+7844b9b4e180612c7ca35bcb07ce7f86610b22c4

ExternalRevisions/VulkanSamples_repo_revision

@@ -1 +1 @@
-9f72cf123c673e47679bb72caa06a17d7b0258dd
+036541ca8f65333bf911b3957afa2c49f83fa0cd

ExternalRevisions/glslang_repo_revision

@@ -1 +1 @@
-4fc7a33910fb8e40b970d160e1b38ab3f67fe0f3
+e157435c1e777aa1052f446dafed162b4a722e03

Scripts/packagePregenSpirvToolsHeaders

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2016-2020 The Brenwill Workshop Ltd.
+#
+# packagePregenSpirvToolsHeaders - Packages Spirv-Tools headers to simplify building glslang
+#
+# macOS usage: ./packagePregenSpirvToolsHeaders
+#
+
+set -o errexit
+
+
+# ----------------- Main -------------------
+
+EXT_DIR=../External
+SPV_TLS_BLD_DIR="${EXT_DIR}/glslang/External/spirv-tools/build"
+TPLT_DIR=../Templates/spirv-tools
+TPLT_BLD_DIR="${TPLT_DIR}/build"
+
+rm -rf "${TPLT_BLD_DIR}"
+mkdir -p "${TPLT_BLD_DIR}"
+cp -a "${SPV_TLS_BLD_DIR}/"*.h "${SPV_TLS_BLD_DIR}/"*.inc "${TPLT_BLD_DIR}"
+
+cd "${TPLT_DIR}"
+rm -f build.zip
+zip -qr build.zip build
+rm -rf build/
+cd -  > /dev/null
+