Revert "Re-land sksl fragment processor support"

This reverts commit c070939fd1a954b7a492bc30f0cf64a664b90181.

Reason for revert: 

This has some knock-on effects in the generation of Android.bp from our GN files.  See gn/gn_to_bp.py?  We're seeing things like "tmp/tmpsBVycx/gen/" end up in the include search path in Android.bp, which obviously don't exist there...

Original change's description:
> Re-land sksl fragment processor support
> 
> This reverts commit ed50200682e0de72c3abecaa4d5324ebcd1ed9f9.
> 
> Bug: skia:
> Change-Id: I9caa7454b391450620d6989dc472abb3cf7a2cab
> Reviewed-on: https://skia-review.googlesource.com/20965
> Reviewed-by: Ben Wagner <benjaminwagner@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=benjaminwagner@google.com,ethannicholas@google.com

Change-Id: I502486b5405923b322429219f4cc396a45a14cea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20990
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 24 insertions, 17 deletions

diff --git a/src/sksl/SkSLIRGenerator.h b/src/sksl/SkSLIRGenerator.h
index 3078a9e8df..29513d8d34 100644
--- a/src/sksl/SkSLIRGenerator.h
+++ b/src/sksl/SkSLIRGenerator.h
@@ -27,7 +27,6 @@
 #include "ast/SkSLASTModifiersDeclaration.h"
 #include "ast/SkSLASTPrefixExpression.h"
 #include "ast/SkSLASTReturnStatement.h"
-#include "ast/SkSLASTSection.h"
 #include "ast/SkSLASTStatement.h"
 #include "ast/SkSLASTSuffixExpression.h"
 #include "ast/SkSLASTSwitchStatement.h"
@@ -43,7 +42,6 @@
 #include "ir/SkSLModifiers.h"
 #include "ir/SkSLModifiersDeclaration.h"
 #include "ir/SkSLProgram.h"
-#include "ir/SkSLSection.h"
 #include "ir/SkSLSymbolTable.h"
 #include "ir/SkSLStatement.h"
 #include "ir/SkSLType.h"
@@ -52,6 +50,28 @@
 
 namespace SkSL {
 
+struct CapValue {
+    CapValue()
+    : fKind(kInt_Kind)
+    , fValue(-1) {
+        ASSERT(false);
+    }
+
+    CapValue(bool b)
+    : fKind(kBool_Kind)
+    , fValue(b) {}
+
+    CapValue(int i)
+    : fKind(kInt_Kind)
+    , fValue(i) {}
+
+    enum {
+        kBool_Kind,
+        kInt_Kind,
+    } fKind;
+    int fValue;
+};
+
 /**
  * Performs semantic analysis on an abstract syntax tree (AST) and produces the corresponding
  * (unoptimized) intermediate representation (IR).
@@ -75,7 +95,6 @@ public:
                                              Token::Kind op,
                                              const Expression& right) const;
     Program::Inputs fInputs;
-    const Program::Settings* fSettings;
     const Context& fContext;
 
 private:
@@ -141,9 +160,7 @@ private:
     Modifiers convertModifiers(const Modifiers& m);
     std::unique_ptr<Expression> convertPrefixExpression(const ASTPrefixExpression& expression);
     std::unique_ptr<Statement> convertReturn(const ASTReturnStatement& r);
-    std::unique_ptr<Section> convertSection(const ASTSection& e);
     std::unique_ptr<Expression> getCap(Position position, String name);
-    std::unique_ptr<Expression> getArg(Position position, String name);
     std::unique_ptr<Expression> convertSuffixExpression(const ASTSuffixExpression& expression);
     std::unique_ptr<Expression> convertField(std::unique_ptr<Expression> base,
                                              const String& field);
@@ -156,26 +173,16 @@ private:
                                                  std::unique_ptr<Block> main,
                                                  std::vector<std::unique_ptr<ProgramElement>>* out);
 
-    /**
-     * Wraps an expression in code that applies a colorspace transformation to it. This is used
-     * to implement texture(sampler, coord, colorSpaceXForm).
-     */
-    std::unique_ptr<Expression> applyColorSpace(std::unique_ptr<Expression> texture,
-                                                const Variable* xform);
     void fixRectSampling(std::vector<std::unique_ptr<Expression>>& arguments);
     void checkValid(const Expression& expr);
     void markWrittenTo(const Expression& expr, bool readWrite);
 
     const FunctionDeclaration* fCurrentFunction;
-    std::unordered_map<String, Program::Settings::Value> fCapsMap;
-    std::shared_ptr<SymbolTable> fRootSymbolTable;
+    const Program::Settings* fSettings;
+    std::unordered_map<String, CapValue> fCapsMap;
     std::shared_ptr<SymbolTable> fSymbolTable;
-    // holds extra temp variable declarations needed for the current function
-    std::vector<std::unique_ptr<Statement>> fExtraVars;
     int fLoopLevel;
     int fSwitchLevel;
-    // count of temporary variables we have created
-    int fTmpCount;
     ErrorReporter& fErrors;
     int fInvocations;