Workaround for PowerVR clear issue.

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.
  */
 
 
 
@@ skipping 528 matching lines @@
     // support NV_blend_equation_advanced.
     GrDeviceCoordTexture dstCopy;
     if (!this->setupDstReadIfNecessary(&dstCopy, NULL)) {
         return;
     }
 
     this->onDrawPaths(pathRange, indices, count, transforms, transformsType, fill,
                       dstCopy.texture() ? &dstCopy : 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.
+        SkIRect rtRect = SkIRect::MakeWH(renderTarget->width(), renderTarget->height());
+        if (NULL == rect || canIgnoreRect || rect->contains(rtRect)) {
+            rect = &rtRect;
+            // We first issue a discard() since that may help tilers.
+            this->discard(renderTarget);
+        }
+        AutoStateRestore asr(this, kReset_ASRInit, &SkMatrix::I());
+
+        this->drawState()->setColor(color);
+        this->drawState()->disableState(GrDrawState::kClip_StateBit);
+        this->drawState()->disableState(GrDrawState::kHWAntialias_StateBit);
+        this->drawState()->setRenderTarget(renderTarget);
+
+        this->drawSimpleRect(*rect);
+    } else {       
+        this->onClear(rect, color, canIgnoreRect, renderTarget);
+    }
+}
+
 typedef GrTraceMarkerSet::Iter TMIter;
 void GrDrawTarget::saveActiveTraceMarkers() {
     if (this->caps()->gpuTracingSupport()) {
         SkASSERT(0 == fStoredTraceMarkers.count());
         fStoredTraceMarkers.addSet(fActiveTraceMarkers);
         for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
             this->removeGpuTraceMarker(&(*iter));
         }
     }
 }
@@ skipping 403 matching lines @@
     fShaderDerivativeSupport = false;
     fGeometryShaderSupport = false;
     fDualSourceBlendingSupport = false;
     fPathRenderingSupport = false;
     fDstReadInShaderSupport = false;
     fDiscardRenderTargetSupport = false;
     fReuseScratchTextures = true;
     fGpuTracingSupport = false;
     fCompressedTexSubImageSupport = false;
 
+    fUseDrawInsteadOfClear = false;
+
     fMapBufferFlags = kNone_MapFlags;
 
     fMaxRenderTargetSize = 0;
     fMaxTextureSize = 0;
     fMaxSampleCount = 0;
 
     memset(fConfigRenderSupport, 0, sizeof(fConfigRenderSupport));
     memset(fConfigTextureSupport, 0, sizeof(fConfigTextureSupport));
 }
 
 GrDrawTargetCaps& GrDrawTargetCaps::operator=(const GrDrawTargetCaps& other) {
     fMipMapSupport = other.fMipMapSupport;
     fNPOTTextureTileSupport = other.fNPOTTextureTileSupport;
     fTwoSidedStencilSupport = other.fTwoSidedStencilSupport;
     fStencilWrapOpsSupport = other.fStencilWrapOpsSupport;
     fHWAALineSupport = other.fHWAALineSupport;
     fShaderDerivativeSupport = other.fShaderDerivativeSupport;
     fGeometryShaderSupport = other.fGeometryShaderSupport;
     fDualSourceBlendingSupport = other.fDualSourceBlendingSupport;
     fPathRenderingSupport = other.fPathRenderingSupport;
     fDstReadInShaderSupport = other.fDstReadInShaderSupport;
     fDiscardRenderTargetSupport = other.fDiscardRenderTargetSupport;
     fReuseScratchTextures = other.fReuseScratchTextures;
     fGpuTracingSupport = other.fGpuTracingSupport;
     fCompressedTexSubImageSupport = other.fCompressedTexSubImageSupport;
 
+    fUseDrawInsteadOfClear = other.fUseDrawInsteadOfClear;
+
     fMapBufferFlags = other.fMapBufferFlags;
 
     fMaxRenderTargetSize = other.fMaxRenderTargetSize;
     fMaxTextureSize = other.fMaxTextureSize;
     fMaxSampleCount = other.fMaxSampleCount;
 
     memcpy(fConfigRenderSupport, other.fConfigRenderSupport, sizeof(fConfigRenderSupport));
     memcpy(fConfigTextureSupport, other.fConfigTextureSupport, sizeof(fConfigTextureSupport));
 
     return *this;
@@ skipping 15 matching lines @@
         }
         SkDEBUGCODE(flags &= ~GrDrawTargetCaps::kSubset_MapFlag);
     }
     SkASSERT(0 == flags); // Make sure we handled all the flags.
     return str;
 }
 
 SkString GrDrawTargetCaps::dump() const {
     SkString r;
     static const char* gNY[] = {"NO", "YES"};
-    r.appendf("MIP Map Support              : %s\n", gNY[fMipMapSupport]);
-    r.appendf("NPOT Texture Tile Support    : %s\n", gNY[fNPOTTextureTileSupport]);
-    r.appendf("Two Sided Stencil Support    : %s\n", gNY[fTwoSidedStencilSupport]);
-    r.appendf("Stencil Wrap Ops  Support    : %s\n", gNY[fStencilWrapOpsSupport]);
-    r.appendf("HW AA Lines Support          : %s\n", gNY[fHWAALineSupport]);
-    r.appendf("Shader Derivative Support    : %s\n", gNY[fShaderDerivativeSupport]);
-    r.appendf("Geometry Shader Support      : %s\n", gNY[fGeometryShaderSupport]);
-    r.appendf("Dual Source Blending Support : %s\n", gNY[fDualSourceBlendingSupport]);
-    r.appendf("Path Rendering Support       : %s\n", gNY[fPathRenderingSupport]);
-    r.appendf("Dst Read In Shader Support   : %s\n", gNY[fDstReadInShaderSupport]);
-    r.appendf("Discard Render Target Support: %s\n", gNY[fDiscardRenderTargetSupport]);
-    r.appendf("Reuse Scratch Textures       : %s\n", gNY[fReuseScratchTextures]);
-    r.appendf("Gpu Tracing Support          : %s\n", gNY[fGpuTracingSupport]);
-    r.appendf("Compressed Update Support    : %s\n", gNY[fCompressedTexSubImageSupport]);
-    r.appendf("Max Texture Size             : %d\n", fMaxTextureSize);
-    r.appendf("Max Render Target Size       : %d\n", fMaxRenderTargetSize);
-    r.appendf("Max Sample Count             : %d\n", fMaxSampleCount);
+    r.appendf("MIP Map Support                    : %s\n", gNY[fMipMapSupport]);
+    r.appendf("NPOT Texture Tile Support          : %s\n", gNY[fNPOTTextureTileSupport]);
+    r.appendf("Two Sided Stencil Support          : %s\n", gNY[fTwoSidedStencilSupport]);
+    r.appendf("Stencil Wrap Ops  Support          : %s\n", gNY[fStencilWrapOpsSupport]);
+    r.appendf("HW AA Lines Support                : %s\n", gNY[fHWAALineSupport]);
+    r.appendf("Shader Derivative Support          : %s\n", gNY[fShaderDerivativeSupport]);
+    r.appendf("Geometry Shader Support            : %s\n", gNY[fGeometryShaderSupport]);
+    r.appendf("Dual Source Blending Support       : %s\n", gNY[fDualSourceBlendingSupport]);
+    r.appendf("Path Rendering Support             : %s\n", gNY[fPathRenderingSupport]);
+    r.appendf("Dst Read In Shader Support         : %s\n", gNY[fDstReadInShaderSupport]);
+    r.appendf("Discard Render Target Support      : %s\n", gNY[fDiscardRenderTargetSupport]);
+    r.appendf("Reuse Scratch Textures             : %s\n", gNY[fReuseScratchTextures]);
+    r.appendf("Gpu Tracing Support                : %s\n", gNY[fGpuTracingSupport]);
+    r.appendf("Compressed Update Support          : %s\n", gNY[fCompressedTexSubImageSupport]);
 
-    r.appendf("Map Buffer Support           : %s\n", map_flags_to_string(fMapBufferFlags).c_str());
+    r.appendf("Draw Instead of Clear [workaround] : %s\n", gNY[fUseDrawInsteadOfClear]);
+
+    r.appendf("Max Texture Size                   : %d\n", fMaxTextureSize);
+    r.appendf("Max Render Target Size             : %d\n", fMaxRenderTargetSize);
+    r.appendf("Max Sample Count                   : %d\n", fMaxSampleCount);
+
+    r.appendf("Map Buffer Support                 : %s\n",
+              map_flags_to_string(fMapBufferFlags).c_str());
 
     static const char* kConfigNames[] = {
         "Unknown",  // kUnknown_GrPixelConfig
         "Alpha8",   // kAlpha_8_GrPixelConfig,
         "Index8",   // kIndex_8_GrPixelConfig,
         "RGB565",   // kRGB_565_GrPixelConfig,
         "RGBA444",  // kRGBA_4444_GrPixelConfig,
         "RGBA8888", // kRGBA_8888_GrPixelConfig,
         "BGRA8888", // kBGRA_8888_GrPixelConfig,
         "ETC1",     // kETC1_GrPixelConfig,
@@ skipping 39 matching lines @@
 
 uint32_t GrDrawTargetCaps::CreateUniqueID() {
     static int32_t gUniqueID = SK_InvalidUniqueID;
     uint32_t id;
     do {
         id = static_cast<uint32_t>(sk_atomic_inc(&gUniqueID) + 1);
     } while (id == SK_InvalidUniqueID);
     return id;
 }