Add GpuCommandBuffer support.

Currently this is not actually hooked into the system.

To give some context, in a follow up CL I'll add this to GrDrawTarget.
For this I will move the gpu onDraw command to the GpuCommandBuffer as well.
For GL this will end up just being a pass through to a non virtual draw(...)
on GrGLGpu, and for vulkan it will mostly do what it currently does but
adding commands to the secondary command buffer instead.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2038583002

Review-Url: https://codereview.chromium.org/2038583002

1 files changed, 37 insertions, 0 deletions

diff --git a/src/gpu/GrGpuCommandBuffer.h b/src/gpu/GrGpuCommandBuffer.h
new file mode 100644
index 0000000000..3c6e6116fb
--- /dev/null
+++ b/src/gpu/GrGpuCommandBuffer.h
@@ -0,0 +1,37 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef GrGpuCommandBuffer_DEFINED
+#define GrGpuCommandBuffer_DEFINED
+
+#include "GrColor.h"
+
+class GrRenderTarget;
+
+class GrGpuCommandBuffer {
+public:
+    enum LoadAndStoreOp {
+        kLoadAndStore_LoadAndStoreOp,
+        kLoadAndDiscard_LoadAndStoreOp,
+        kClearAndStore_LoadAndStoreOp,
+        kClearAndDiscard_LoadAndStoreOp,
+        kDiscardAndStore_LoadAndStoreOp,
+        kDiscardAndDiscard_LoadAndStoreOp,
+    };
+
+    GrGpuCommandBuffer() {}
+    virtual ~GrGpuCommandBuffer() {}
+
+    // Signals the end of recording to the command buffer and that it can now be submitted.
+    virtual void end() = 0;
+
+    // Sends the command buffer off to the GPU object to execute the commands built up in the
+    // buffer. The gpu object is allowed to defer execution of the commands until it is flushed.
+    virtual void submit() = 0;
+};
+
+#endif