Use texture barriers to read directly from the RT

tests/GLProgramsTest.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This is a GPU-backend specific test. It relies on static intializers to work
 
@@ skipping 298 matching lines @@
             return false;
         }
 
         // create optimized draw state, setup readDst texture if required, and build a descriptor
         // and program.  ODS creation can fail, so we have to check
         GrPipeline pipeline(pipelineBuilder, colorPOI, coveragePOI,
                             *gpu->caps(), scissor, &dstCopy);
         if (pipeline.mustSkip()) {
             continue;
         }
+
+        GrXferBarrierType barrierType;
+        if (pipeline.getXferProcessor()->willNeedXferBarrier(rt, *gpu->caps(), &barrierType)) {
+            gpu->setXferBarrier(barrierType);
+        }
+
         GrBatchTracker bt;
         primProc->initBatchTracker(&bt, pipeline.getInitBatchTracker());
 
         GrProgramDesc desc;
         gpu->buildProgramDesc(&desc, *primProc, pipeline, bt);
 
         GrGpu::DrawArgs args(primProc, &pipeline, &desc, &bt);
         SkAutoTUnref<GrGLProgram> program(GrGLProgramBuilder::CreateProgram(args, gpu));
 
         if (NULL == program.get()) {
@@ skipping 44 matching lines @@
             }
 #endif
             GrTestTarget target;
             context->getTestTarget(&target);
             REPORTER_ASSERT(reporter, target.target()->programUnitTest(maxStages));
         }
     }
 }
 
 #endif