Set up cache in vulkan to reuse GrVkPrograms (aka VkPipelines)

src/gpu/vk/GrVkRenderPass.cpp

 /*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "GrVkRenderPass.h"
 
+#include "GrProcessor.h"
 #include "GrVkFramebuffer.h"
 #include "GrVkGpu.h"
 #include "GrVkRenderTarget.h"
 #include "GrVkUtil.h"
 
 void setup_simple_vk_attachment_description(VkAttachmentDescription* attachment,
                                             VkFormat format,
                                             uint32_t samples,
                                             VkImageLayout layout) {
     attachment->flags = 0;
@@ skipping 191 matching lines @@
         }
     }
     if (fAttachmentFlags & kStencil_AttachmentFlag) {
         if (fAttachmentsDescriptor.fStencil != desc.fStencil) {
             return false;
         }
     }
 
     return true;
 }
+
+void GrVkRenderPass::genKey(GrProcessorKeyBuilder* b) const {
+    b->add32(fAttachmentFlags);
+    if (fAttachmentFlags & kColor_AttachmentFlag) {
+        b->add32(fAttachmentsDescriptor.fColor.fFormat);
+        b->add32(fAttachmentsDescriptor.fColor.fSamples);
+    }
+    if (fAttachmentFlags & kResolve_AttachmentFlag) {
+        b->add32(fAttachmentsDescriptor.fResolve.fFormat);
+        b->add32(fAttachmentsDescriptor.fResolve.fSamples);
+    }
+    if (fAttachmentFlags & kStencil_AttachmentFlag) {
+        b->add32(fAttachmentsDescriptor.fStencil.fFormat);
+        b->add32(fAttachmentsDescriptor.fStencil.fSamples);
+    }
+}
+