Add discard API to SkCanvas, plumb it to glDiscardFramebuffer()

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 1001 matching lines @@
     fNPOTTextureTileSupport = false;
     fTwoSidedStencilSupport = false;
     fStencilWrapOpsSupport = false;
     fHWAALineSupport = false;
     fShaderDerivativeSupport = false;
     fGeometryShaderSupport = false;
     fDualSourceBlendingSupport = false;
     fBufferLockSupport = false;
     fPathRenderingSupport = false;
     fDstReadInShaderSupport = false;
+    fDiscardRenderTargetSupport = false;
     fReuseScratchTextures = true;
     fGpuTracingSupport = false;
 
     fMaxRenderTargetSize = 0;
     fMaxTextureSize = 0;
     fMaxSampleCount = 0;
 
     memset(fConfigRenderSupport, 0, sizeof(fConfigRenderSupport));
 }
 
 GrDrawTargetCaps& GrDrawTargetCaps::operator=(const GrDrawTargetCaps& other) {
     f8BitPaletteSupport = other.f8BitPaletteSupport;
     fMipMapSupport = other.fMipMapSupport;
     fNPOTTextureTileSupport = other.fNPOTTextureTileSupport;
     fTwoSidedStencilSupport = other.fTwoSidedStencilSupport;
     fStencilWrapOpsSupport = other.fStencilWrapOpsSupport;
     fHWAALineSupport = other.fHWAALineSupport;
     fShaderDerivativeSupport = other.fShaderDerivativeSupport;
     fGeometryShaderSupport = other.fGeometryShaderSupport;
     fDualSourceBlendingSupport = other.fDualSourceBlendingSupport;
     fBufferLockSupport = other.fBufferLockSupport;
     fPathRenderingSupport = other.fPathRenderingSupport;
     fDstReadInShaderSupport = other.fDstReadInShaderSupport;
+    fDiscardRenderTargetSupport = other.fDiscardRenderTargetSupport;
     fReuseScratchTextures = other.fReuseScratchTextures;
     fGpuTracingSupport = other.fGpuTracingSupport;
 
     fMaxRenderTargetSize = other.fMaxRenderTargetSize;
     fMaxTextureSize = other.fMaxTextureSize;
     fMaxSampleCount = other.fMaxSampleCount;
 
     memcpy(fConfigRenderSupport, other.fConfigRenderSupport, sizeof(fConfigRenderSupport));
 
     return *this;
 }
 
 SkString GrDrawTargetCaps::dump() const {
     SkString r;
     static const char* gNY[] = {"NO", "YES"};
-    r.appendf("8 Bit Palette Support       : %s\n", gNY[f8BitPaletteSupport]);
-    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("Buffer Lock Support         : %s\n", gNY[fBufferLockSupport]);
-    r.appendf("Path Rendering Support      : %s\n", gNY[fPathRenderingSupport]);
-    r.appendf("Dst Read In Shader Support  : %s\n", gNY[fDstReadInShaderSupport]);
-    r.appendf("Reuse Scratch Textures      : %s\n", gNY[fReuseScratchTextures]);
-    r.appendf("Gpu Tracing Support         : %s\n", gNY[fGpuTracingSupport]);
-    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("8 Bit Palette Support        : %s\n", gNY[f8BitPaletteSupport]);
+    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("Buffer Lock Support          : %s\n", gNY[fBufferLockSupport]);
+    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("Max Texture Size             : %d\n", fMaxTextureSize);
+    r.appendf("Max Render Target Size       : %d\n", fMaxRenderTargetSize);
+    r.appendf("Max Sample Count             : %d\n", fMaxSampleCount);
 
     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,
     };
@@ skipping 11 matching lines @@
     for (size_t i = 0; i < SK_ARRAY_COUNT(kConfigNames); ++i)  {
         if (i != kUnknown_GrPixelConfig) {
             r.appendf("%s is renderable: %s, with MSAA: %s\n",
                      kConfigNames[i],
                      gNY[fConfigRenderSupport[i][0]],
                      gNY[fConfigRenderSupport[i][1]]);
         }
     }
     return r;
 }