re-land of added sk_FragCoord support to skslc

BUG=skia:

Change-Id: Ifac1aa39839058787ad1794200c3dbb93c147a69
Reviewed-on: https://skia-review.googlesource.com/5850
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 37 insertions, 6 deletions

diff --git a/src/sksl/ir/SkSLProgram.h b/src/sksl/ir/SkSLProgram.h
index 8393341269..ac49d6dcc7 100644
--- a/src/sksl/ir/SkSLProgram.h
+++ b/src/sksl/ir/SkSLProgram.h
@@ -4,42 +4,73 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
- 
+
 #ifndef SKSL_PROGRAM
 #define SKSL_PROGRAM
 
 #include <vector>
 #include <memory>
 
+#include "SkSLContext.h"
 #include "SkSLModifiers.h"
 #include "SkSLProgramElement.h"
 #include "SkSLSymbolTable.h"
 
+// name of the render target height uniform
+#define SKSL_RTHEIGHT_NAME "u_skRTHeight"
+
 namespace SkSL {
 
 /**
  * Represents a fully-digested program, ready for code generation.
  */
 struct Program {
+    struct Settings {
+        const GrShaderCaps* fCaps = nullptr;
+        bool fFlipY = false;
+    };
+
+    struct Inputs {
+        // if true, this program requires the render target height uniform to be defined
+        bool fRTHeight;
+
+        void reset() {
+            fRTHeight = false;
+        }
+
+        bool isEmpty() {
+            return !fRTHeight;
+        }
+    };
+
     enum Kind {
         kFragment_Kind,
         kVertex_Kind
     };
 
-    Program(Kind kind, 
+    Program(Kind kind,
+            Settings settings,
             Modifiers::Flag defaultPrecision,
-            std::vector<std::unique_ptr<ProgramElement>> elements, 
-            std::shared_ptr<SymbolTable> symbols)
-    : fKind(kind) 
+            Context* context,
+            std::vector<std::unique_ptr<ProgramElement>> elements,
+            std::shared_ptr<SymbolTable> symbols,
+            Inputs inputs)
+    : fKind(kind)
+    , fSettings(settings)
     , fDefaultPrecision(defaultPrecision)
+    , fContext(context)
     , fElements(std::move(elements))
-    , fSymbols(symbols) {}
+    , fSymbols(symbols)
+    , fInputs(inputs) {}
 
     Kind fKind;
+    Settings fSettings;
     // FIXME handle different types; currently it assumes this is for floats
     Modifiers::Flag fDefaultPrecision;
+    Context* fContext;
     std::vector<std::unique_ptr<ProgramElement>> fElements;
     std::shared_ptr<SymbolTable> fSymbols;
+    Inputs fInputs;
 };
 
 } // namespace