Refactor Vulkan support to support Fuchsia

- Refactor runtime lookup of Vulkan functions
- Support Magma surfaces
- Add build flags to toggle Vulkan support

BUG=skia:

Change-Id: Ic71965c453507882521443006c4155c7481a9a3f
Reviewed-on: https://skia-review.googlesource.com/9342
Commit-Queue: Greg Daniel <egdaniel@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Michael Jurka <mikejurka@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 9 insertions, 15 deletions

diff --git a/include/gpu/vk/GrVkInterface.h b/include/gpu/vk/GrVkInterface.h
index 9dc033392c..dca47ffc4c 100644
--- a/include/gpu/vk/GrVkInterface.h
+++ b/include/gpu/vk/GrVkInterface.h
@@ -15,20 +15,6 @@
 ////////////////////////////////////////////////////////////////////////////////
 
 /**
- * The default interface is returned by GrVkCreateInterface. This function's
- * implementation is platform-specific.
- */
-
-struct GrVkInterface;
-
-/**
- * Creates a GrVkInterface.
- */
-const GrVkInterface* GrVkCreateInterface(VkInstance instance, VkDevice device,
-                                         uint32_t extensionFlags);
-
-
-/**
  * GrContext uses the following interface to make all calls into Vulkan. When a
  * GrContext is created it is given a GrVkInterface. All functions that should be
  * available based on the Vulkan's version must be non-NULL or GrContext creation
@@ -49,7 +35,15 @@ private:
     typedef SkRefCnt INHERITED;
 
 public:
-    GrVkInterface();
+    using GetProc = std::function<PFN_vkVoidFunction(
+        const char*, // function name
+        VkInstance,  // instance or VK_NULL_HANDLE
+        VkDevice     // device or VK_NULL_HANDLE
+        )>;
+    GrVkInterface(GetProc getProc,
+                  VkInstance instance,
+                  VkDevice device,
+                  uint32_t extensionFlags);
 
     // Validates that the GrVkInterface supports its advertised standard. This means the necessary
     // function pointers have been initialized for Vulkan version.