Add vulkan files into skia repo. This is an incomplete backend with only partial functionality at this time.

R=robertphillips@google.com
TBR=bsalomon@google.com

BUG=skia:4955
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1718693002

Committed: https://skia.googlesource.com/skia/+/48cf268defad66f58f1aa03b4835e5583be96b2f

Review URL: https://codereview.chromium.org/1718693002

1 files changed, 69 insertions, 0 deletions

diff --git a/src/gpu/vk/GrVkProgramDesc.h b/src/gpu/vk/GrVkProgramDesc.h
new file mode 100644
index 0000000000..1767a051ba
--- /dev/null
+++ b/src/gpu/vk/GrVkProgramDesc.h
@@ -0,0 +1,69 @@
+/*
+ * 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 GrVkProgramDesc_DEFINED
+#define GrVkProgramDesc_DEFINED
+
+#include "GrColor.h"
+#include "GrProgramDesc.h"
+#include "GrGpu.h"
+#include "GrTypesPriv.h"
+
+#include "shaderc/shaderc.h"
+#include "vulkan/vulkan.h"
+
+class GrVkGpu;
+class GrVkProgramDescBuilder;
+
+class GrVkProgramDesc : public GrProgramDesc {
+private:
+    friend class GrVkProgramDescBuilder;
+};
+
+/**
+ * This class can be used to build a GrProgramDesc.  It also provides helpers for accessing
+ * GL specific info in the header.
+ */
+class GrVkProgramDescBuilder {
+public:
+    typedef GrProgramDesc::KeyHeader KeyHeader;
+    // The key, stored in fKey, is composed of five parts(first 2 are defined in the key itself):
+    // 1. uint32_t for total key length.
+    // 2. uint32_t for a checksum.
+    // 3. Header struct defined above.
+    // 4. Backend-specific information including per-processor keys and their key lengths.
+    //    Each processor's key is a variable length array of uint32_t.
+    enum {
+        // Part 3.
+        kHeaderOffset = GrVkProgramDesc::kHeaderOffset,
+        kHeaderSize = SkAlign4(sizeof(KeyHeader)),
+        // Part 4.
+        // This is the offset into the backenend specific part of the key, which includes
+        // per-processor keys.
+        kProcessorKeysOffset = kHeaderOffset + kHeaderSize,
+    };
+
+    /**
+     * Builds a GL specific program descriptor
+     *
+     * @param GrPrimitiveProcessor The geometry
+     * @param GrPipeline  The optimized drawstate.  The descriptor will represent a program
+     *                        which this optstate can use to draw with.  The optstate contains
+     *                        general draw information, as well as the specific color, geometry,
+     *                        and coverage stages which will be used to generate the GL Program for
+     *                        this optstate.
+     * @param GrVkGpu  A GL Gpu, the caps and Gpu object are used to output processor specific
+     *                 parts of the descriptor.
+     * @param GrProgramDesc  The built and finalized descriptor
+     **/
+    static bool Build(GrProgramDesc*,
+                      const GrPrimitiveProcessor&,
+                      const GrPipeline&,
+                      const GrGLSLCaps&);
+};
+
+#endif