Check for xfer barriers in GrBatch, auto-issue barriers in GrGpu

src/gpu/GrReorderCommandBuilder.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 "GrReorderCommandBuilder.h"
 
 template <class Left, class Right>
 static bool intersect(const Left& a, const Right& b) {
     SkASSERT(a.fLeft <= a.fRight && a.fTop <= a.fBottom &&
              b.fLeft <= b.fRight && b.fTop <= b.fBottom);
     return a.fLeft < b.fRight && b.fLeft < a.fRight &&
            a.fTop < b.fBottom && b.fTop < a.fBottom;
 }
 
-GrTargetCommands::Cmd* GrReorderCommandBuilder::recordDrawBatch(GrBatch* batch) {
+GrTargetCommands::Cmd* GrReorderCommandBuilder::recordDrawBatch(GrBatch* batch,
+                                                                const GrCaps& caps) {
     // Check if there is a Batch Draw we can batch with by linearly searching back until we either
     // 1) check every draw
     // 2) intersect with something
     // 3) find a 'blocker'
     // Experimentally we have found that most batching occurs within the first 10 comparisons.
     static const int kMaxLookback = 10;
     int i = 0;
 
     GrRenderTarget* rt = batch->pipeline()->getRenderTarget();
 
@@ skipping 22 matching lines @@
         do {
             if (Cmd::kDrawBatch_CmdType == reverseIter->type()) {
                 DrawBatch* previous = static_cast<DrawBatch*>(reverseIter.get());
 
                 if (previous->batch()->pipeline()->getRenderTarget() != rt) {
                     GrBATCH_INFO("\t\tBreaking because of (%s, B%u) Rendertarget\n",
                                  previous->fBatch->name(), previous->fBatch->uniqueID());
                     break;
                 }
                 // We cannot continue to search backwards if the render target changes
-                if (previous->batch()->combineIfPossible(batch)) {
+                if (previous->batch()->combineIfPossible(batch, caps)) {
                     GrBATCH_INFO("\t\tCombining with (%s, B%u)\n",
                                  previous->fBatch->name(), previous->fBatch->uniqueID());
                     return NULL;
                 }
 
                 if (intersect(previous->batch()->bounds(), batch->bounds())) {
                     GrBATCH_INFO("\t\tIntersects with (%s, B%u)\n",
                                  previous->fBatch->name(), previous->fBatch->uniqueID());
                     break;
                 }
@@ skipping 27 matching lines @@
 #endif
     }
 #if GR_BATCH_SPEW
     else {
         GrBATCH_INFO("\t\tBreaking because empty command buffer\n");
     }
 #endif
 
     return GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), DrawBatch, (batch, this->batchTarget()));
 }