Revert of Create xfer processor backend. (patchset #6 id:100001 of https://codereview.chromium.org/764643004/)

Reason for revert:
CL breaks windows DM

Original issue's description:
> Create xfer processor backend.
>
> This includes:
> -Having an actual XP stage at the end of the gl pipeline.
> -All Blending work is handled by XP until actually setting GL blend states
> -GLPrograms test to test XP
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/4dffc940c430eec66d4707490eace19c9b3f7904

TBR=bsalomon@google.com,joshualitt@chromium.org,egdaniel@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/789343002

1 files changed, 40 insertions, 1 deletions

diff --git a/src/gpu/GrProgramDesc.h b/src/gpu/GrProgramDesc.h
index 3d53842e43..a20b99f749 100644
--- a/src/gpu/GrProgramDesc.h
+++ b/src/gpu/GrProgramDesc.h
@@ -55,6 +55,36 @@ public:
     }
 
 
+    ///////////////////////////////////////////////////////////////////////////
+    /// @name Stage Output Types
+    ////
+
+    enum PrimaryOutputType {
+        // Modulate color and coverage, write result as the color output.
+        kModulate_PrimaryOutputType,
+        // Combines the coverage, dst, and color as coverage * color + (1 - coverage) * dst. This
+        // can only be set if fDstReadKey is non-zero.
+        kCombineWithDst_PrimaryOutputType,
+
+        kPrimaryOutputTypeCnt,
+    };
+
+    enum SecondaryOutputType {
+        // There is no secondary output
+        kNone_SecondaryOutputType,
+        // Writes coverage as the secondary output. Only set if dual source blending is supported
+        // and primary output is kModulate.
+        kCoverage_SecondaryOutputType,
+        // Writes coverage * (1 - colorA) as the secondary output. Only set if dual source blending
+        // is supported and primary output is kModulate.
+        kCoverageISA_SecondaryOutputType,
+        // Writes coverage * (1 - colorRGBA) as the secondary output. Only set if dual source
+        // blending is supported and primary output is kModulate.
+        kCoverageISC_SecondaryOutputType,
+
+        kSecondaryOutputTypeCnt,
+    };
+
     // Specifies where the initial color comes from before the stages are applied.
     enum ColorInput {
         kAllOnes_ColorInput,
@@ -75,6 +105,9 @@ public:
         ColorInput                  fColorInput : 8;
         ColorInput                  fCoverageInput : 8;
 
+        PrimaryOutputType           fPrimaryOutputType : 8;
+        SecondaryOutputType         fSecondaryOutputType : 8;
+
         SkBool8                     fHasGeometryProcessor;
         int8_t                      fColorEffectCnt;
         int8_t                      fCoverageEffectCnt;
@@ -107,7 +140,10 @@ public:
                    fInputCoverageIsUsed == that.fInputCoverageIsUsed &&
                    fReadsDst == that.fReadsDst &&
                    fReadsFragPosition == that.fReadsFragPosition &&
-                   fRequiresLocalCoordAttrib == that.fRequiresLocalCoordAttrib;
+                   fRequiresLocalCoordAttrib == that.fRequiresLocalCoordAttrib &&
+                   fPrimaryOutputType == that.fPrimaryOutputType &&
+                   fSecondaryOutputType == that.fSecondaryOutputType;
+
         }
         bool operator!=(const DescInfo& that) const { return !(*this == that); };
         // TODO when GPs control uniform / attribute handling of color / coverage, then we can
@@ -126,6 +162,9 @@ public:
         bool            fReadsFragPosition;
         bool            fRequiresLocalCoordAttrib;
 
+        // Fragment shader color outputs
+        GrProgramDesc::PrimaryOutputType  fPrimaryOutputType : 8;
+        GrProgramDesc::SecondaryOutputType  fSecondaryOutputType : 8;
     };
 
 private: