Dependencies are now added between the drawTargets in GrPipeline

This CL relies on https://codereview.chromium.org/1414773002/ (Add the machinery to GrDrawTarget to enable topological sorting)

BUG=skia:4094

Review URL: https://codereview.chromium.org/1414903002

src/gpu/GrDrawTarget.cpp

@@ -32,13 +32,14 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-GrDrawTarget::GrDrawTarget(GrGpu* gpu, GrResourceProvider* resourceProvider)
+GrDrawTarget::GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider* resourceProvider)
     : fGpu(SkRef(gpu))
     , fResourceProvider(resourceProvider)
     , fFlushState(fGpu, fResourceProvider, 0)
     , fFlushing(false)
     , fFirstUnpreparedBatch(0)
-    , fFlags(0) {
+    , fFlags(0)
+    , fRenderTarget(rt) {
     // TODO: Stop extracting the context (currently needed by GrClipMaskManager)
     fContext = fGpu->getContext();
     fClipMaskManager.reset(new GrClipMaskManager(this));
@@ -50,6 +51,10 @@ GrDrawTarget::GrDrawTarget(GrGpu* gpu, GrResourceProvider* resourceProvider)
 }
 
 GrDrawTarget::~GrDrawTarget() {
+    if (fRenderTarget && this == fRenderTarget->getLastDrawTarget()) {
+        fRenderTarget->setLastDrawTarget(nullptr);
+    }
+
     fGpu->unref();
 }
 
@@ -182,7 +187,7 @@ void GrDrawTarget::flush() {
     // drawTargets will be created to replace them if the SkGpuDevice(s) write to them again.
     this->makeClosed();
 
-    // Loop over all batches and generate geometry
+    // Loop over the batches that haven't yet generated their geometry
     for (; fFirstUnpreparedBatch < fBatches.count(); ++fFirstUnpreparedBatch) {
         fBatches[fFirstUnpreparedBatch]->prepare(&fFlushState);
     }
@@ -227,6 +232,10 @@ void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder, GrDrawBat
         return;
     }
 
+#ifdef ENABLE_MDB
+    batch->pipeline()->addDependenciesTo(fRenderTarget);
+#endif
+
     this->recordBatch(batch);
 }
 
@@ -458,6 +467,10 @@ void GrDrawTarget::copySurface(GrSurface* dst,
                                const SkIPoint& dstPoint) {
     GrBatch* batch = GrCopySurfaceBatch::Create(dst, src, srcRect, dstPoint);
     if (batch) {
+#ifdef ENABLE_MDB
+        this->addDependency(src);
+#endif
+
         this->recordBatch(batch);
         batch->unref();
     }

src/gpu/GrDrawTarget.h

@@ -45,7 +45,7 @@ class GrDrawTarget final : public SkRefCnt {
 public:
     // The context may not be fully constructed and should not be used during GrDrawTarget
     // construction.
-    GrDrawTarget(GrGpu* gpu, GrResourceProvider*);
+    GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider*);
 
     ~GrDrawTarget() override;
 
@@ -314,6 +314,7 @@ private:
 
     // 'this' drawTarget relies on the output of the drawTargets in 'fDependencies'
     SkTDArray<GrDrawTarget*>                    fDependencies;
+    GrRenderTarget*                             fRenderTarget;
 
     typedef SkRefCnt INHERITED;
 };

src/gpu/GrDrawingManager.cpp

@@ -105,7 +105,7 @@ GrDrawTarget* GrDrawingManager::newDrawTarget(GrRenderTarget* rt) {
     }
 #endif
 
-    GrDrawTarget* dt = new GrDrawTarget(fContext->getGpu(), fContext->resourceProvider());
+    GrDrawTarget* dt = new GrDrawTarget(rt, fContext->getGpu(), fContext->resourceProvider());
 
     *fDrawTargets.append() = dt;
 

src/gpu/GrPipeline.cpp

@@ -8,6 +8,7 @@
 #include "GrPipeline.h"
 
 #include "GrCaps.h"
+#include "GrDrawTarget.h"
 #include "GrGpu.h"
 #include "GrPipelineBuilder.h"
 #include "GrProcOptInfo.h"
@@ -130,6 +131,35 @@ GrPipeline* GrPipeline::CreateAt(void* memory, const CreateArgs& args,
     return pipeline;
 }
 
+static void add_dependencies_for_processor(const GrFragmentProcessor* proc, GrRenderTarget* rt) {
+    for (int i = 0; i < proc->numChildProcessors(); ++i) {
+        // need to recurse
+        add_dependencies_for_processor(&proc->childProcessor(i), rt);
+    }
+
+    for (int i = 0; i < proc->numTextures(); ++i) {
+        GrTexture* texture = proc->textureAccess(i).getTexture();
+        SkASSERT(rt->getLastDrawTarget());
+        rt->getLastDrawTarget()->addDependency(texture);
+    }
+}
+
+void GrPipeline::addDependenciesTo(GrRenderTarget* rt) const {
+    for (int i = 0; i < fFragmentProcessors.count(); ++i) {
+        add_dependencies_for_processor(fFragmentProcessors[i].get(), rt);
+    }
+
+    if (fXferProcessor.get()) {
+        const GrXferProcessor* xfer = fXferProcessor.get();
+
+        for (int i = 0; i < xfer->numTextures(); ++i) {
+            GrTexture* texture = xfer->textureAccess(i).getTexture();   
+            SkASSERT(rt->getLastDrawTarget());
+            rt->getLastDrawTarget()->addDependency(texture);
+        }
+    }
+}
+
 void GrPipeline::adjustProgramFromOptimizations(const GrPipelineBuilder& pipelineBuilder,
                                                 GrXferProcessor::OptFlags flags,
                                                 const GrProcOptInfo& colorPOI,

src/gpu/GrPipeline.h

@@ -84,6 +84,9 @@ public:
     ///////////////////////////////////////////////////////////////////////////
     /// @name GrFragmentProcessors
 
+    // Make the renderTarget's drawTarget (if it exists) be dependent on any
+    // drawTargets in this pipeline
+    void addDependenciesTo(GrRenderTarget* rt) const;
 
     int numColorFragmentProcessors() const { return fNumColorProcessors; }
     int numCoverageFragmentProcessors() const {

src/gpu/GrRenderTarget.cpp

@@ -71,7 +71,10 @@ void GrRenderTarget::onAbandon() {
 
 void GrRenderTarget::setLastDrawTarget(GrDrawTarget* dt) {
     if (fLastDrawTarget) {
+        // The non-MDB world never closes so we can't check this condition
+#ifdef ENABLE_MDB
         SkASSERT(fLastDrawTarget->isClosed());
+#endif
     }
 
     fLastDrawTarget = dt;