Don't pass in RT to individual Gpu CommandBuffer calls

The Vulkan backend already stored a GrVkRT, but was inconsistent
in sometimes using the stored value and sometimes the passed in
value (though they should be the same). This just cleans up the
code so that everyone uses a stored RT.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3126

Change-Id: I571de4bfb1da612d61171321d5224a9a19d8e545
Reviewed-on: https://skia-review.googlesource.com/3126
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/vk/GrVkGpuCommandBuffer.cpp b/src/gpu/vk/GrVkGpuCommandBuffer.cpp
index e0cfce3..f4ac7c8 100644
--- a/src/gpu/vk/GrVkGpuCommandBuffer.cpp
+++ b/src/gpu/vk/GrVkGpuCommandBuffer.cpp
@@ -91,6 +91,7 @@
 }
 
 GrGpu* GrVkGpuCommandBuffer::gpu() { return fGpu; }
+GrRenderTarget* GrVkGpuCommandBuffer::renderTarget() { return fRenderTarget; }
 
 void GrVkGpuCommandBuffer::end() {
     fCommandBuffer->end(fGpu);
@@ -136,7 +137,7 @@
                                        fRenderTarget, bounds);
 }
 
-void GrVkGpuCommandBuffer::discard(GrRenderTarget* target) {
+void GrVkGpuCommandBuffer::discard() {
     if (fIsEmpty) {
         // We will change the render pass to do a clear load instead
         GrVkRenderPass::LoadStoreOps vkColorOps(VK_ATTACHMENT_LOAD_OP_DONT_CARE,
@@ -146,15 +147,14 @@
 
         const GrVkRenderPass* oldRP = fRenderPass;
 
-        GrVkRenderTarget* vkRT = static_cast<GrVkRenderTarget*>(target);
         const GrVkResourceProvider::CompatibleRPHandle& rpHandle =
-            vkRT->compatibleRenderPassHandle();
+            fRenderTarget->compatibleRenderPassHandle();
         if (rpHandle.isValid()) {
             fRenderPass = fGpu->resourceProvider().findRenderPass(rpHandle,
                                                                   vkColorOps,
                                                                   vkStencilOps);
         } else {
-            fRenderPass = fGpu->resourceProvider().findRenderPass(*vkRT,
+            fRenderPass = fGpu->resourceProvider().findRenderPass(*fRenderTarget,
                                                                   vkColorOps,
                                                                   vkStencilOps);
         }
@@ -165,14 +165,11 @@
     }
 }
 
-void GrVkGpuCommandBuffer::onClearStencilClip(GrRenderTarget* target,
-                                              const GrFixedClip& clip,
+void GrVkGpuCommandBuffer::onClearStencilClip(const GrFixedClip& clip,
                                               bool insideStencilMask) {
-    SkASSERT(target);
     SkASSERT(!clip.hasWindowRectangles());
 
-    GrVkRenderTarget* vkRT = static_cast<GrVkRenderTarget*>(target);
-    GrStencilAttachment* sb = target->renderTargetPriv().getStencilAttachment();
+    GrStencilAttachment* sb = fRenderTarget->renderTargetPriv().getStencilAttachment();
     // this should only be called internally when we know we have a
     // stencil buffer.
     SkASSERT(sb);
@@ -193,13 +190,13 @@
     // Flip rect if necessary
     SkIRect vkRect;
     if (!clip.scissorEnabled()) {
-        vkRect.setXYWH(0, 0, vkRT->width(), vkRT->height());
-    } else if (kBottomLeft_GrSurfaceOrigin != vkRT->origin()) {
+        vkRect.setXYWH(0, 0, fRenderTarget->width(), fRenderTarget->height());
+    } else if (kBottomLeft_GrSurfaceOrigin != fRenderTarget->origin()) {
         vkRect = clip.scissorRect();
     } else {
         const SkIRect& scissor = clip.scissorRect();
-        vkRect.setLTRB(scissor.fLeft, vkRT->height() - scissor.fBottom,
-                       scissor.fRight, vkRT->height() - scissor.fTop);
+        vkRect.setLTRB(scissor.fLeft, fRenderTarget->height() - scissor.fBottom,
+                       scissor.fRight, fRenderTarget->height() - scissor.fTop);
     }
 
     clearRect.rect.offset = { vkRect.fLeft, vkRect.fTop };
@@ -220,16 +217,13 @@
     fIsEmpty = false;
 }
 
-void GrVkGpuCommandBuffer::onClear(GrRenderTarget* target, const GrFixedClip& clip, GrColor color) {
+void GrVkGpuCommandBuffer::onClear(const GrFixedClip& clip, GrColor color) {
     // parent class should never let us get here with no RT
-    SkASSERT(target);
     SkASSERT(!clip.hasWindowRectangles());
 
     VkClearColorValue vkColor;
     GrColorToRGBAFloat(color, vkColor.float32);
 
-    GrVkRenderTarget* vkRT = static_cast<GrVkRenderTarget*>(target);
-
     if (fIsEmpty && !clip.scissorEnabled()) {
         // We will change the render pass to do a clear load instead
         GrVkRenderPass::LoadStoreOps vkColorOps(VK_ATTACHMENT_LOAD_OP_CLEAR,
@@ -240,13 +234,13 @@
         const GrVkRenderPass* oldRP = fRenderPass;
 
         const GrVkResourceProvider::CompatibleRPHandle& rpHandle =
-            vkRT->compatibleRenderPassHandle();
+            fRenderTarget->compatibleRenderPassHandle();
         if (rpHandle.isValid()) {
             fRenderPass = fGpu->resourceProvider().findRenderPass(rpHandle,
                                                                   vkColorOps,
                                                                   vkStencilOps);
         } else {
-            fRenderPass = fGpu->resourceProvider().findRenderPass(*vkRT,
+            fRenderPass = fGpu->resourceProvider().findRenderPass(*fRenderTarget,
                                                                   vkColorOps,
                                                                   vkStencilOps);
         }
@@ -264,13 +258,13 @@
     // Flip rect if necessary
     SkIRect vkRect;
     if (!clip.scissorEnabled()) {
-        vkRect.setXYWH(0, 0, vkRT->width(), vkRT->height());
-    } else if (kBottomLeft_GrSurfaceOrigin != vkRT->origin()) {
+        vkRect.setXYWH(0, 0, fRenderTarget->width(), fRenderTarget->height());
+    } else if (kBottomLeft_GrSurfaceOrigin != fRenderTarget->origin()) {
         vkRect = clip.scissorRect();
     } else {
         const SkIRect& scissor = clip.scissorRect();
-        vkRect.setLTRB(scissor.fLeft, vkRT->height() - scissor.fBottom,
-                       scissor.fRight, vkRT->height() - scissor.fTop);
+        vkRect.setLTRB(scissor.fLeft, fRenderTarget->height() - scissor.fBottom,
+                       scissor.fRight, fRenderTarget->height() - scissor.fTop);
     }
     clearRect.rect.offset = { vkRect.fLeft, vkRect.fTop };
     clearRect.rect.extent = { (uint32_t)vkRect.width(), (uint32_t)vkRect.height() };
@@ -378,9 +372,7 @@
     if (!meshCount) {
         return;
     }
-    GrRenderTarget* rt = pipeline.getRenderTarget();
-    GrVkRenderTarget* vkRT = static_cast<GrVkRenderTarget*>(rt);
-    const GrVkRenderPass* renderPass = vkRT->simpleRenderPass();
+    const GrVkRenderPass* renderPass = fRenderTarget->simpleRenderPass();
     SkASSERT(renderPass);
 
     prepare_sampled_images(primProc, fGpu);