Revert "Move gn setup for vulkan library/headers into their own third_party directory."

This reverts commit 477094250cd55a38d4d796ab6c50eb57bdba65e1.

Reason for revert:
I think we know this broke the MoltenVK bots.  It also appears to have broken the Fuchsia roll: https://logs.chromium.org/v/?s=fuchsia%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8945885190914943680%2F%2B%2Fsteps%2Fbuild%2F0%2Fsteps%2Fbuild_fuchsia%2F0%2Fsteps%2Fgn_gen%2F0%2Fstdout

Original change's description:
> Move gn setup for vulkan library/headers into their own third_party directory.
> 
> Bug: skia:
> Change-Id: I4605f0d962271efb77bf3c17f1b0daaaddfb51c8
> Reviewed-on: https://skia-review.googlesource.com/128540
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>
> Reviewed-by: Ben Wagner <bungeman@google.com>

TBR=egdaniel@google.com,mtklein@google.com,bungeman@google.com

Change-Id: I6e41d98e39883eff34424a2f352b0c8adec178db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/129444
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 55 insertions, 14 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 1e89661c5b..d59cea6dda 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -43,6 +43,9 @@ declare_args() {
   skia_enable_spirv_validation = is_skia_dev_build && is_debug
   skia_enable_tools = is_skia_dev_build
   skia_enable_vulkan_debug_layers = is_skia_dev_build && is_debug
+  skia_vulkan_header = ""
+  skia_vulkan_sdk = getenv("VULKAN_SDK")
+  skia_moltenvk_path = ""
   skia_qt_path = getenv("QT_PATH")
   skia_compile_processors = false
   skia_generate_workarounds = false
@@ -76,6 +79,17 @@ declare_args() {
     skia_ios_profile = "Google Development"
   }
 }
+declare_args() {
+  skia_tools_vulkan_header_dir = ""
+  if (skia_use_vulkan) {
+    # When buliding on Android we get the header via the NDK so no need for any extra path.
+    if (is_fuchsia) {
+      skia_tools_vulkan_header_dir = "$fuchsia_vulkan_sdk/include"
+    } else if (is_linux || is_win) {
+      skia_tools_vulkan_header_dir = "$skia_vulkan_sdk/include"
+    }
+  }
+}
 
 if (defined(skia_settings)) {
   import(skia_settings)
@@ -117,6 +131,9 @@ if (skia_use_metal) {
 # Skia public API, generally provided by :skia.
 config("skia_public") {
   include_dirs = skia_public_includes
+  if (skia_tools_vulkan_header_dir != "") {
+    include_dirs += [ skia_tools_vulkan_header_dir ]
+  }
   defines = []
   if (is_component_build) {
     defines += [ "SKIA_DLL" ]
@@ -208,6 +225,32 @@ config("skia_library") {
   defines = [ "SKIA_IMPLEMENTATION=1" ]
 }
 
+config("moltenvk") {
+  if (is_ios) {
+    moltenvk_framework_path = "$skia_moltenvk_path/MoltenVK/iOS"
+  } else {
+    moltenvk_framework_path = "$skia_moltenvk_path/MoltenVK/macOS"
+  }
+  cflags = [
+    "-F$moltenvk_framework_path",
+    "-isystem$skia_moltenvk_path/MoltenVK/include",  # for <vulkan/vulkan.h>
+  ]
+  ldflags = [ "-F$moltenvk_framework_path" ]
+  libs = [
+    "MoltenVK.framework",
+    "Metal.framework",
+    "IOSurface.framework",
+    "QuartzCore.framework",
+    "Foundation.framework",
+  ]
+  if (is_ios) {
+    libs += [ "UIKit.framework" ]
+  } else {
+    libs += [ "IOKit.framework" ]
+  }
+  defines = [ "SK_MOLTENVK" ]
+}
+
 skia_library_configs = [
   ":skia_public",
   ":skia_private",
@@ -359,7 +402,6 @@ template("optional") {
                              "*",
                              [
                                "public_defines",
-                               "public_deps",
                                "deps",
                                "libs",
                                "sources",
@@ -581,7 +623,6 @@ optional("gpu") {
   }
   public_defines = []
   public_configs = []
-  public_deps = []
 
   sources = skia_gpu_sources + skia_sksl_sources + skia_gpu_processor_outputs
 
@@ -617,17 +658,22 @@ optional("gpu") {
   }
 
   if (skia_use_vulkan) {
-    # TODO: We should make this deps be //third_party/vulkan and then update clients to have a
-    # //third_party/vulkan directory in their trees so they can set up the vulkan library however
-    # they want. For example this would allow us to remove the fuchsia specific vulkan code in our
-    # vulkan files.
-    public_deps += [ "third_party/vulkan" ]
+    public_defines += [ "SK_VULKAN" ]
     sources += skia_vk_sources
     if (skia_enable_vulkan_debug_layers) {
       public_defines += [ "SK_ENABLE_VK_LAYERS" ]
     }
+    if (skia_vulkan_header != "") {
+      public_defines += [ "SK_VULKAN_HEADER=\"$skia_vulkan_header\"" ]
+    } else if (skia_moltenvk_path != "") {
+      public_defines += [ "SK_VULKAN_HEADER=<MoltenVK/mvk_vulkan.h>" ]
+    } else if (is_skia_dev_build) {
+      public_defines += [ "SK_VULKAN_HEADER=\"GrVulkanDefines.h\"" ]
+    }
+    if (skia_moltenvk_path != "") {
+      public_configs += [ ":moltenvk" ]
+    }
   }
-
   if (skia_use_legacy_gpu_pixel_ops) {
     public_defines += [ "SK_LEGACY_GPU_PIXEL_OPS" ]
   }
@@ -845,6 +891,7 @@ component("skia") {
     ":fontmgr_empty",
     ":fontmgr_fontconfig",
     ":fontmgr_fuchsia",
+    ":gpu",
     ":heif",
     ":hsw",
     ":jpeg",
@@ -861,12 +908,6 @@ component("skia") {
     ":xml",
   ]
 
-  # We need the public deps here for Vulkan. Our third_party/vulkan target sets some defines that
-  # need to get propagated up to the tools that depend on :skia and thus :gpu.
-  public_deps = [
-    ":gpu",
-  ]
-
   # This file (and all GN files in Skia) are designed to work with an
   # empty sources assignment filter; we handle all that explicitly.
   # We clear the filter here for clients who may have set up a global filter.