Implement instanced rendering for simple shapes

src/gpu/GrDrawTarget.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawTarget.h"
 
 #include "GrAuditTrail.h"
 #include "GrCaps.h"
 #include "GrGpu.h"
 #include "GrPath.h"
 #include "GrPipeline.h"
 #include "GrMemoryPool.h"
 #include "GrRenderTarget.h"
 #include "GrResourceProvider.h"
 #include "GrRenderTargetPriv.h"
+#include "GrInstancedRendering.h"
 #include "GrSurfacePriv.h"
 #include "GrTexture.h"
 #include "gl/GrGLRenderTarget.h"
 
 #include "SkStrokeRec.h"
 
 #include "batches/GrClearBatch.h"
 #include "batches/GrCopySurfaceBatch.h"
 #include "batches/GrDiscardBatch.h"
 #include "batches/GrDrawBatch.h"
 #include "batches/GrDrawPathBatch.h"
 #include "batches/GrRectBatchFactory.h"
 #include "batches/GrStencilPathBatch.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 
 // Experimentally we have found that most batching occurs within the first 10 comparisons.
 static const int kDefaultMaxBatchLookback  = 10;
 static const int kDefaultMaxBatchLookahead = 10;
 
 GrDrawTarget::GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider* resourceProvider,
                            GrAuditTrail* auditTrail, const Options& options)
     : fGpu(SkRef(gpu))
     , fResourceProvider(resourceProvider)
     , fAuditTrail(auditTrail)
     , fFlags(0)
-    , fRenderTarget(rt) {
+    , fRenderTarget(rt)
+    , fInstancedRendering(fGpu->createInstancedRenderingIfSupported()) {
     // TODO: Stop extracting the context (currently needed by GrClipMaskManager)
     fContext = fGpu->getContext();
     fClipMaskManager.reset(new GrClipMaskManager(this, options.fClipBatchToBounds));
 
     fDrawBatchBounds = options.fDrawBatchBounds;
     fMaxBatchLookback = (options.fMaxBatchLookback < 0) ? kDefaultMaxBatchLookback :
                                                           options.fMaxBatchLookback;
     fMaxBatchLookahead = (options.fMaxBatchLookahead < 0) ? kDefaultMaxBatchLookahead :
                                                            options.fMaxBatchLookahead;
 
@@ skipping 139 matching lines @@
     // but need to be flushed anyway. Closing such drawTargets here will mean new
     // drawTargets will be created to replace them if the SkGpuDevice(s) write to them again.
     this->makeClosed();
 
     // Loop over the batches that haven't yet generated their geometry
     for (int i = 0; i < fBatches.count(); ++i) {
         if (fBatches[i]) {
             fBatches[i]->prepare(flushState);
         }
     }
+
+    if (fInstancedRendering) {
+        fInstancedRendering->beginFlush(flushState->resourceProvider());
+    }
 }
 
 void GrDrawTarget::drawBatches(GrBatchFlushState* flushState) {
     // Draw all the generated geometry.
     SkRandom random;
     for (int i = 0; i < fBatches.count(); ++i) {
         if (!fBatches[i]) {
             continue;
         }
         if (fDrawBatchBounds) {
             const SkRect& bounds = fBatches[i]->bounds();
             SkIRect ibounds;
             bounds.roundOut(&ibounds);
             // In multi-draw buffer all the batches use the same render target and we won't need to
             // get the batchs bounds.
             if (GrRenderTarget* rt = fBatches[i]->renderTarget()) {
                 fGpu->drawDebugWireRect(rt, ibounds, 0xFF000000 | random.nextU());
             }
         }
         fBatches[i]->draw(flushState);
     }
 
     fGpu->finishDrawTarget();
 }
 
 void GrDrawTarget::reset() {
     fBatches.reset();
+    if (fInstancedRendering) {
+        fInstancedRendering->endFlush();
+    }
 }
 
 void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder,
                              GrDrawBatch* batch,
                              const SkIRect* scissorRect) {
     // Setup clip
     GrPipelineBuilder::AutoRestoreStencil ars;
     GrAppliedClip clip;
 
     if (scissorRect) {
@@ skipping 356 matching lines @@
     }
 
     return true;
 }
 
 void GrDrawTarget::clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) {
     GrBatch* batch = new GrClearStencilClipBatch(rect, insideClip, rt);
     this->recordBatch(batch);
     batch->unref();
 }