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>

1 files changed, 17 insertions, 24 deletions

diff --git a/src/sksl/SkSLIRGenerator.h b/src/sksl/SkSLIRGenerator.h
index 29513d8d34..3078a9e8df 100644
--- a/src/sksl/SkSLIRGenerator.h
+++ b/src/sksl/SkSLIRGenerator.h
@@ -27,6 +27,7 @@
 #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"
@@ -42,6 +43,7 @@
 #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"
@@ -50,28 +52,6 @@
 
 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).
@@ -95,6 +75,7 @@ public:
                                              Token::Kind op,
                                              const Expression& right) const;
     Program::Inputs fInputs;
+    const Program::Settings* fSettings;
     const Context& fContext;
 
 private:
@@ -160,7 +141,9 @@ 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);
@@ -173,16 +156,26 @@ 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;
-    const Program::Settings* fSettings;
-    std::unordered_map<String, CapValue> fCapsMap;
+    std::unordered_map<String, Program::Settings::Value> fCapsMap;
+    std::shared_ptr<SymbolTable> fRootSymbolTable;
     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;