Refactor creation of GrVkRenderPasses to make them move general

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) {
+typedef GrVkRenderPass::AttachmentsDescriptor::AttachmentDesc AttachmentDesc;
+
+void setup_vk_attachment_description(VkAttachmentDescription* attachment,
+                                     const AttachmentDesc& desc,
+                                     VkImageLayout layout) {
     attachment->flags = 0;
-    attachment->format = format;
-    SkAssertResult(GrSampleCountToVkSampleCount(samples, &attachment->samples));
-    attachment->loadOp = VK_ATTACHMENT_LOAD_OP_LOAD;
-    attachment->storeOp = VK_ATTACHMENT_STORE_OP_STORE;
-    attachment->stencilLoadOp = VK_ATTACHMENT_LOAD_OP_LOAD;
-    attachment->stencilStoreOp = VK_ATTACHMENT_STORE_OP_STORE;
+    attachment->format = desc.fFormat;
+    SkAssertResult(GrSampleCountToVkSampleCount(desc.fSamples, &attachment->samples));
+    switch (layout) {
+        case VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL:
+            attachment->loadOp = desc.fLoadOp;
+            attachment->storeOp = desc.fStoreOp;
+            attachment->stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+            attachment->stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+            break;
+        case VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL:
+            attachment->loadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
+            attachment->storeOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
+            attachment->stencilLoadOp = desc.fLoadOp;
+            attachment->stencilStoreOp = desc.fStoreOp;
+            break;
+        default:
+            SkFAIL("Unexpected attachment layout");
+    }
+
     attachment->initialLayout = layout;
     attachment->finalLayout = layout;
 }
 
 void GrVkRenderPass::initSimple(const GrVkGpu* gpu, const GrVkRenderTarget& target) {
     // Get attachment information from render target. This includes which attachments the render
     // target has (color, resolve, stencil) and the attachments format and sample count.
     target.getAttachmentsDescriptor(&fAttachmentsDescriptor, &fAttachmentFlags);
 
     uint32_t numAttachments = fAttachmentsDescriptor.fAttachmentCount;
@@ skipping 12 matching lines @@
     // Go through each of the attachment types (color, resolve, stencil) and set the necessary
     // on the various Vk structs.
     VkSubpassDescription subpassDesc;
     memset(&subpassDesc, 0, sizeof(VkSubpassDescription));
     subpassDesc.flags = 0;
     subpassDesc.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
     subpassDesc.inputAttachmentCount = 0;
     subpassDesc.pInputAttachments = nullptr;
     if (fAttachmentFlags & kColor_AttachmentFlag) {
         // set up color attachment
-        setup_simple_vk_attachment_description(&attachments[currentAttachment],
-                                               fAttachmentsDescriptor.fColor.fFormat,
-                                               fAttachmentsDescriptor.fColor.fSamples,
-                                               VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
+        setup_vk_attachment_description(&attachments[currentAttachment],
+                                        fAttachmentsDescriptor.fColor,
+                                        VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
         // setup subpass use of attachment
         colorRef.attachment = currentAttachment++;
         colorRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
         subpassDesc.colorAttachmentCount = 1;
     } else {
         // I don't think there should ever be a time where we don't have a color attachment
         SkASSERT(false);
         colorRef.attachment = VK_ATTACHMENT_UNUSED;
         colorRef.layout = VK_IMAGE_LAYOUT_UNDEFINED;
         subpassDesc.colorAttachmentCount = 0;
     }
     subpassDesc.pColorAttachments = &colorRef;
 
     if (fAttachmentFlags & kResolve_AttachmentFlag) {
         // set up resolve attachment
-        setup_simple_vk_attachment_description(&attachments[currentAttachment],
-                                               fAttachmentsDescriptor.fResolve.fFormat,
-                                               fAttachmentsDescriptor.fResolve.fSamples,
-                                               VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
+        setup_vk_attachment_description(&attachments[currentAttachment],
+                                        fAttachmentsDescriptor.fResolve,
+                                        VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);
         // setup subpass use of attachment
         resolveRef.attachment = currentAttachment++;
         // I'm really not sure what the layout should be for the resolve textures.
         resolveRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
         subpassDesc.pResolveAttachments = &resolveRef;
     } else {
         subpassDesc.pResolveAttachments = nullptr;
     }
 
     if (fAttachmentFlags & kStencil_AttachmentFlag) {
         // set up stencil attachment
-        setup_simple_vk_attachment_description(&attachments[currentAttachment],
-                                               fAttachmentsDescriptor.fStencil.fFormat,
-                                               fAttachmentsDescriptor.fStencil.fSamples,
-                                               VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL);
+        setup_vk_attachment_description(&attachments[currentAttachment],
+                                        fAttachmentsDescriptor.fStencil,
+                                        VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL);
         // setup subpass use of attachment
         stencilRef.attachment = currentAttachment++;
         stencilRef.layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
     } else {
         stencilRef.attachment = VK_ATTACHMENT_UNUSED;
         stencilRef.layout = VK_IMAGE_LAYOUT_UNDEFINED;
     }
     subpassDesc.pDepthStencilAttachment = &stencilRef;
 
     subpassDesc.preserveAttachmentCount = 0;
@@ skipping 88 matching lines @@
 bool GrVkRenderPass::isCompatible(const GrVkRenderTarget& target) const {
     AttachmentsDescriptor desc;
     AttachmentFlags flags;
     target.getAttachmentsDescriptor(&desc, &flags);
 
     if (flags != fAttachmentFlags) {
         return false;
     }
 
     if (fAttachmentFlags & kColor_AttachmentFlag) {
-        if (fAttachmentsDescriptor.fColor != desc.fColor) {
+        if (!fAttachmentsDescriptor.fColor.isCompatible(desc.fColor)) {
             return false;
         }
     }
     if (fAttachmentFlags & kResolve_AttachmentFlag) {
-        if (fAttachmentsDescriptor.fResolve != desc.fResolve) {
+        if (!fAttachmentsDescriptor.fResolve.isCompatible(desc.fResolve)) {
             return false;
         }
     }
     if (fAttachmentFlags & kStencil_AttachmentFlag) {
-        if (fAttachmentsDescriptor.fStencil != desc.fStencil) {
+        if (!fAttachmentsDescriptor.fStencil.isCompatible(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);
     }
 }