Add vulkan files into skia repo.

src/gpu/vk/GrVkRenderPass.h

+/*
+* Copyright 2015 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef GrVkRenderPass_DEFINED
+#define GrVkRenderPass_DEFINED
+
+#include "GrTypes.h"
+
+#include "GrVkResource.h"
+
+#include "vulkan/vulkan.h"
+
+class GrVkGpu;
+class GrVkRenderTarget;
+
+class GrVkRenderPass : public GrVkResource {
+public:
+    GrVkRenderPass() : INHERITED(), fRenderPass(nullptr) {}
+    void initSimple(const GrVkGpu* gpu, const GrVkRenderTarget& target);
+
+    struct AttachmentsDescriptor {
+        struct AttachmentDesc {
+            VkFormat fFormat;
+            int fSamples;
+            AttachmentDesc() : fFormat(VK_FORMAT_UNDEFINED), fSamples(0) {}
+            bool operator==(const AttachmentDesc& right) const {
+                return (fFormat == right.fFormat && fSamples == right.fSamples);
+            }
+            bool operator!=(const AttachmentDesc& right) const {
+                return !(*this == right);
+            }
+        };
+        AttachmentDesc fColor;
+        AttachmentDesc fResolve;
+        AttachmentDesc fStencil;
+        uint32_t       fAttachmentCount;
+    };
+
+    enum AttachmentFlags {
+        kColor_AttachmentFlag = 0x1,
+        kResolve_AttachmentFlag = 0x2,
+        kStencil_AttachmentFlag = 0x4,
+    };
+    GR_DECL_BITFIELD_OPS_FRIENDS(AttachmentFlags);
+
+    // The following return the index of the render pass attachment array for the given attachment.
+    // If the render pass does not have the given attachment it will return false and not set the
+    // index value.
+    bool colorAttachmentIndex(uint32_t* index) const;
+    bool resolveAttachmentIndex(uint32_t* index) const;
+    bool stencilAttachmentIndex(uint32_t* index) const;
+
+    // Sets the VkRenderPassBeginInfo and VkRenderPassContents need to begin a render pass.
+    // TODO: In the future I expect this function will also take an optional render area instead of
+    // defaulting to the entire render target.
+    // TODO: Figure out if load clear values should be passed into this function or should be stored
+    // on the GrVkRenderPass at create time since we'll know at that point if we want to do a load
+    // clear.
+    void getBeginInfo(const GrVkRenderTarget& target,
+                      VkRenderPassBeginInfo* beginInfo,
+                      VkSubpassContents* contents) const;
+
+    // Returns whether or not the structure of a RenderTarget matches that of the VkRenderPass in
+    // this object. Specifically this compares that the number of attachments, format of
+    // attachments, and sample counts are all the same. This function is used in the creation of
+    // basic RenderPasses that can be used when creating a VkFrameBuffer object.
+    bool isCompatible(const GrVkRenderTarget& target) const;
+
+    VkRenderPass vkRenderPass() const { return fRenderPass; }
+
+private:
+    GrVkRenderPass(const GrVkRenderPass&);
+    GrVkRenderPass& operator=(const GrVkRenderPass&);
+
+    void freeGPUData(const GrVkGpu* gpu) const override;
+
+    VkRenderPass          fRenderPass;
+    AttachmentFlags       fAttachmentFlags;
+    AttachmentsDescriptor fAttachmentsDescriptor;
+
+    typedef GrVkResource INHERITED;
+};
+
+GR_MAKE_BITFIELD_OPS(GrVkRenderPass::AttachmentFlags);
+
+#endif