Add define to use customize vulkan header.

Bug: skia:
Change-Id: Ia87c81a54603a02b2f8f51a735bf173a49afe6c7
Reviewed-on: https://skia-review.googlesource.com/81121
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

BUILD.gn

@@ -40,6 +40,7 @@ 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_qt_path = getenv("QT_PATH")
   skia_compile_processors = false
@@ -63,13 +64,13 @@ declare_args() {
   }
 }
 declare_args() {
-  skia_vulkan_headers = ""
+  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_vulkan_headers = "$fuchsia_vulkan_sdk/include"
+      skia_tools_vulkan_header_dir = "$fuchsia_vulkan_sdk/include"
     } else if (is_linux || is_win) {
-      skia_vulkan_headers = "$skia_vulkan_sdk/include"
+      skia_tools_vulkan_header_dir = "$skia_vulkan_sdk/include"
     }
   }
 }
@@ -114,8 +115,8 @@ if (skia_use_metal) {
 # Skia public API, generally provided by :skia.
 config("skia_public") {
   include_dirs = skia_public_includes
-  if (skia_vulkan_headers != "") {
-    include_dirs += [ skia_vulkan_headers ]
+  if (skia_tools_vulkan_header_dir != "") {
+    include_dirs += [ skia_tools_vulkan_header_dir ]
   }
   defines = []
   if (is_component_build) {
@@ -178,6 +179,9 @@ config("skia_private") {
   lib_dirs = []
   if (skia_enable_gpu) {
     include_dirs += [ "src/gpu" ]
+    if (skia_enable_tools && skia_use_vulkan) {
+      include_dirs += [ "tools/gpu/vk" ]
+    }
   }
   if (skia_use_angle) {
     defines += [ "SK_ANGLE" ]
@@ -581,6 +585,13 @@ optional("gpu") {
     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_enable_tools) {
+        public_defines += [ "SK_VULKAN_HEADER=\"GrVulkanDefines.h\"" ]
+      }
+    }
   }
   if (skia_enable_spirv_validation) {
     deps += [ "//third_party/spirv-tools" ]
@@ -887,6 +898,10 @@ if (skia_enable_tools) {
 
   config("skia.h_config") {
     include_dirs = [ "$target_gen_dir" ]
+    if (skia_use_vulkan) {
+      # So we can get the header which includes vulkan
+      include_dirs += [ "tools/gpu/vk" ]
+    }
   }
   action("skia.h") {
     public_configs = [ ":skia.h_config" ]

include/gpu/vk/GrVkDefines.h

@@ -11,33 +11,40 @@
 
 #ifdef SK_VULKAN
 
-#if defined(SK_BUILD_FOR_WIN) || defined(SK_BUILD_FOR_WIN32)
-#   if !defined(VK_USE_PLATFORM_WIN32_KHR)
-#      define VK_USE_PLATFORM_WIN32_KHR
-#   endif
-#elif defined(SK_BUILD_FOR_ANDROID)
-#   if !defined(VK_USE_PLATFORM_ANDROID_KHR)
-#      define VK_USE_PLATFORM_ANDROID_KHR
-#   endif
-#elif defined(SK_BUILD_FOR_UNIX)
-#   if defined(__Fuchsia__)
-#     if !defined(VK_USE_PLATFORM_MAGMA_KHR)
-#       define VK_USE_PLATFORM_MAGMA_KHR
+#ifdef SK_VULKAN_HEADER
+#include SK_VULKAN_HEADER
+#else
+// This is deprecated and all clients should define their own custum header shim that sets up
+// defines and includes the vulkan.h header. Then they should define SK_VULKAN_HEADER or set the
+// skia_vulkan_header in gn to point to their custom header.
+#  if defined(SK_BUILD_FOR_WIN) || defined(SK_BUILD_FOR_WIN32)
+#     if !defined(VK_USE_PLATFORM_WIN32_KHR)
+#        define VK_USE_PLATFORM_WIN32_KHR
 #     endif
-#   else
-#     if !defined(VK_USE_PLATFORM_XCB_KHR)
-#        define VK_USE_PLATFORM_XCB_KHR
+#  elif defined(SK_BUILD_FOR_ANDROID)
+#     if !defined(VK_USE_PLATFORM_ANDROID_KHR)
+#        define VK_USE_PLATFORM_ANDROID_KHR
 #     endif
-#   endif
-#endif
+#  elif defined(SK_BUILD_FOR_UNIX)
+#     if defined(__Fuchsia__)
+#       if !defined(VK_USE_PLATFORM_MAGMA_KHR)
+#         define VK_USE_PLATFORM_MAGMA_KHR
+#       endif
+#     else
+#       if !defined(VK_USE_PLATFORM_XCB_KHR)
+#          define VK_USE_PLATFORM_XCB_KHR
+#       endif
+#     endif
+#  endif
 
 // We create our own function table and never directly call any functions via vk*(). So no need to
 // include the prototype functions.
-#if !defined(VK_NO_PROTOTYPES) && !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
-#define VK_NO_PROTOTYPES
-#endif
+#  if !defined(VK_NO_PROTOTYPES) && !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
+#    define VK_NO_PROTOTYPES
+#  endif
 
-#include <vulkan/vulkan.h>
+#  include <vulkan/vulkan.h>
+#endif // SK_VULKAN_HEADER
 
 #define SKIA_REQUIRED_VULKAN_HEADER_VERSION 17
 #if VK_HEADER_VERSION < SKIA_REQUIRED_VULKAN_HEADER_VERSION

tools/gpu/vk/GrVulkanDefines.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrVulkanDefines_DEFINED
+#define GrVulkanDefines_DEFINED
+
+#if defined(SK_BUILD_FOR_WIN) || defined(SK_BUILD_FOR_WIN32)
+#   if !defined(VK_USE_PLATFORM_WIN32_KHR)
+#      define VK_USE_PLATFORM_WIN32_KHR
+#   endif
+#elif defined(SK_BUILD_FOR_ANDROID)
+#   if !defined(VK_USE_PLATFORM_ANDROID_KHR)
+#      define VK_USE_PLATFORM_ANDROID_KHR
+#   endif
+#elif defined(SK_BUILD_FOR_UNIX)
+#   if !defined(VK_USE_PLATFORM_XCB_KHR)
+#      define VK_USE_PLATFORM_XCB_KHR
+#   endif
+#endif
+
+// We create our own function table and never directly call any functions via vk*(). So no need to
+// include the prototype functions.
+#if !defined(VK_NO_PROTOTYPES)
+#define VK_NO_PROTOTYPES
+#endif
+
+#include <vulkan/vulkan.h>
+
+#endif