Move DstCopy on gpu into the GrXferProcessor.

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"
 
@@ skipping 366 matching lines @@
         }
     }
 
 #endif
     if (NULL == pipelineBuilder.getRenderTarget()) {
         return false;
     }
     return true;
 }
 
-bool GrDrawTarget::setupDstReadIfNecessary(GrPipelineBuilder* pipelineBuilder,
+bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
                                            GrDeviceCoordTexture* dstCopy,
                                            const SkRect* drawBounds) {
-    if (this->caps()->dstReadInShaderSupport() || !pipelineBuilder->willEffectReadDstColor()) {
+    if (!pipelineBuilder.willXPNeedDstCopy(*this->caps())) {
         return true;
     }
     SkIRect copyRect;
     const GrClipData* clip = this->getClip();
-    GrRenderTarget* rt = pipelineBuilder->getRenderTarget();
+    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
     clip->getConservativeBounds(rt, &copyRect);
 
     if (drawBounds) {
         SkIRect drawIBounds;
         drawBounds->roundOut(&drawIBounds);
         if (!copyRect.intersect(drawIBounds)) {
 #ifdef SK_DEBUG
             SkDebugf("Missed an early reject. Bailing on draw from setupDstReadIfNecessary.\n");
 #endif
             return false;
         }
     } else {
 #ifdef SK_DEBUG
         //SkDebugf("No dev bounds when dst copy is made.\n");
 #endif
     }
 
     // MSAA consideration: When there is support for reading MSAA samples in the shader we could
     // have per-sample dst values by making the copy multisampled.
     GrSurfaceDesc desc;
     this->initCopySurfaceDstDesc(rt, &desc);
     desc.fWidth = copyRect.width();
     desc.fHeight = copyRect.height();
+    desc.fOrigin = kTopLeft_GrSurfaceOrigin;

[bsalomon, 2015/02/03 17:28:24]

maybe a comment here that our contract with XP is that the dst copy is always
kTopLeft?

[egdaniel, 2015/02/03 19:50:57]

Done.

 
     SkAutoTUnref<GrTexture> copy(
         fContext->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch));
 
     if (!copy) {
         SkDebugf("Failed to create temporary copy of destination texture.\n");
         return false;
     }
     SkIPoint dstPoint = {0, 0};
     if (this->copySurface(copy, rt, copyRect, dstPoint)) {
@@ skipping 34 matching lines @@
         info.fIndexCount    = indexCount;
 
         info.fInstanceCount         = 0;
         info.fVerticesPerInstance   = 0;
         info.fIndicesPerInstance    = 0;
 
         if (devBounds) {
             info.setDevBounds(*devBounds);
         }
 
-        // TODO: We should continue with incorrect blending.
-        GrDeviceCoordTexture dstCopy;
-        if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, devBounds)) {
-            return;
-        }
         this->setDrawBuffers(&info, gp->getVertexStride());
 
-        this->onDraw(*pipelineBuilder, gp, info, scissorState, dstCopy.texture() ? &dstCopy : NULL);
+        this->onDraw(*pipelineBuilder, gp, info, scissorState);
     }
 }
 
 void GrDrawTarget::drawNonIndexed(GrPipelineBuilder* pipelineBuilder,
                                   const GrGeometryProcessor* gp,
                                   GrPrimitiveType type,
                                   int startVertex,
                                   int vertexCount,
                                   const SkRect* devBounds) {
     SkASSERT(pipelineBuilder);
@@ skipping 16 matching lines @@
         info.fIndexCount    = 0;
 
         info.fInstanceCount         = 0;
         info.fVerticesPerInstance   = 0;
         info.fIndicesPerInstance    = 0;
 
         if (devBounds) {
             info.setDevBounds(*devBounds);
         }
 
-        // TODO: We should continue with incorrect blending.
-        GrDeviceCoordTexture dstCopy;
-        if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, devBounds)) {
-            return;
-        }
-
         this->setDrawBuffers(&info, gp->getVertexStride());
 
-        this->onDraw(*pipelineBuilder, gp, info, scissorState, dstCopy.texture() ? &dstCopy : NULL);
+        this->onDraw(*pipelineBuilder, gp, info, scissorState);
     }
 }
 
 
 void GrDrawTarget::drawBatch(GrPipelineBuilder* pipelineBuilder,
                              GrBatch* batch,
                              const SkRect* devBounds) {
     SkASSERT(pipelineBuilder);
     // TODO some kind of checkdraw, but not at this level
 
     // Setup clip
     GrScissorState scissorState;
     GrPipelineBuilder::AutoRestoreEffects are;
     GrPipelineBuilder::AutoRestoreStencil ars;
     if (!this->setupClip(pipelineBuilder, &are, &ars, &scissorState, devBounds)) {
         return;
     }
 
-    GrDeviceCoordTexture dstCopy;
-    if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, devBounds)) {
-        return;
-    }
-
-    this->onDrawBatch(batch, *pipelineBuilder, scissorState, dstCopy.texture() ? &dstCopy : NULL);
+    this->onDrawBatch(batch, *pipelineBuilder, scissorState, devBounds);
 }
 
 static const GrStencilSettings& winding_path_stencil_settings() {
     GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
         kIncClamp_StencilOp,
         kIncClamp_StencilOp,
         kAlwaysIfInClip_StencilFunc,
         0xFFFF, 0xFFFF, 0xFFFF);
     return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
 }
@@ skipping 69 matching lines @@
     if (!this->setupClip(pipelineBuilder, &are, &ars, &scissorState, &devBounds)) {
        return;
     }
 
     // set stencil settings for path
     GrStencilSettings stencilSettings;
     this->getPathStencilSettingsForFilltype(fill,
                                             pipelineBuilder->getRenderTarget()->getStencilBuffer(),
                                             &stencilSettings);
 
-    GrDeviceCoordTexture dstCopy;
-    if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, &devBounds)) {
-        return;
-    }
-
     this->onDrawPath(*pipelineBuilder, pathProc, path, scissorState, stencilSettings,
-                     dstCopy.texture() ? &dstCopy : NULL);
+                     &devBounds);
 }
 
 void GrDrawTarget::drawPaths(GrPipelineBuilder* pipelineBuilder,
                              const GrPathProcessor* pathProc,
                              const GrPathRange* pathRange,
                              const void* indices,
                              PathIndexType indexType,
                              const float transformValues[],
                              PathTransformType transformType,
                              int count,
@@ skipping 13 matching lines @@
     if (!this->setupClip(pipelineBuilder, &are, &ars, &scissorState, NULL)) {
         return;
     }
 
     // set stencil settings for path
     GrStencilSettings stencilSettings;
     this->getPathStencilSettingsForFilltype(fill,
                                             pipelineBuilder->getRenderTarget()->getStencilBuffer(),
                                             &stencilSettings);
 
-    // Don't compute a bounding box for setupDstReadIfNecessary(), we'll opt
+    // Don't compute a bounding box for dst copy texture, we'll opt
     // instead for it to just copy the entire dst. Realistically this is a moot
     // point, because any context that supports NV_path_rendering will also
     // support NV_blend_equation_advanced.
-    GrDeviceCoordTexture dstCopy;
-    if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, NULL)) {
-        return;
-    }
-
     this->onDrawPaths(*pipelineBuilder, pathProc, pathRange, indices, indexType, transformValues,
-                      transformType, count, scissorState, stencilSettings,
-                      dstCopy.texture() ? &dstCopy : NULL);
+                      transformType, count, scissorState, stencilSettings, NULL);
 }
 
 void GrDrawTarget::clear(const SkIRect* rect,
                          GrColor color,
                          bool canIgnoreRect,
                          GrRenderTarget* renderTarget) {
     if (fCaps->useDrawInsteadOfClear()) {
         // This works around a driver bug with clear by drawing a rect instead.
         // The driver will ignore a clear if it is the only thing rendered to a
         // target before the target is read.
@@ skipping 85 matching lines @@
     info.fStartIndex = 0;
     info.fStartVertex = 0;
     info.fIndicesPerInstance = indicesPerInstance;
     info.fVerticesPerInstance = verticesPerInstance;
 
     // Set the same bounds for all the draws.
     if (devBounds) {
         info.setDevBounds(*devBounds);
     }
 
-    // TODO: We should continue with incorrect blending.
-    GrDeviceCoordTexture dstCopy;
-    if (!this->setupDstReadIfNecessary(pipelineBuilder, &dstCopy, devBounds)) {
-        return;
-    }
-
     while (instanceCount) {
         info.fInstanceCount = SkTMin(instanceCount, maxInstancesPerDraw);
         info.fVertexCount = info.fInstanceCount * verticesPerInstance;
         info.fIndexCount = info.fInstanceCount * indicesPerInstance;
 
         if (this->checkDraw(*pipelineBuilder,
                             gp,
                             type,
                             info.fStartVertex,
                             info.fStartIndex,
                             info.fVertexCount,
                             info.fIndexCount)) {
             this->setDrawBuffers(&info, gp->getVertexStride());
-            this->onDraw(*pipelineBuilder, gp, info, scissorState,
-                         dstCopy.texture() ? &dstCopy : NULL);
+            this->onDraw(*pipelineBuilder, gp, info, scissorState);
         }
         info.fStartVertex += info.fVertexCount;
         instanceCount -= info.fInstanceCount;
     }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 GrDrawTarget::AutoReleaseGeometry::AutoReleaseGeometry(
                                          GrDrawTarget*  target,
@@ skipping 417 matching lines @@
                              GrPipelineBuilder::AutoRestoreStencil* ars,
                              GrScissorState* scissorState,
                              const SkRect* devBounds) {
     return fClipMaskManager.setupClipping(pipelineBuilder,
                                           are,
                                           ars,
                                           scissorState,
                                           this->getClip(),
                                           devBounds);
 }