Reland "Renamed SkSL "offset" to "line""

This reverts commit cc91452f0a65f261283615db9ed3d37b1c3acd15.

Change-Id: I7eff0ddeebef4ce298893f9b3ba410b09647e9a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/453138
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/sksl/codegen/SkSLMetalCodeGenerator.cpp b/src/sksl/codegen/SkSLMetalCodeGenerator.cpp
index c0cd482..9b6b7d2 100644
--- a/src/sksl/codegen/SkSLMetalCodeGenerator.cpp
+++ b/src/sksl/codegen/SkSLMetalCodeGenerator.cpp
@@ -110,7 +110,7 @@
     const Type& type = s.type();
     this->writeLine("struct " + type.name() + " {");
     fIndentation++;
-    this->writeFields(type.fields(), type.fOffset);
+    this->writeFields(type.fields(), type.fLine);
     fIndentation--;
     this->writeLine("};");
 }
@@ -1131,7 +1131,7 @@
     } else if (c.type().isMatrix()) {
         this->writeConstructorCompoundMatrix(c, parentPrecedence);
     } else {
-        fContext.fErrors->error(c.fOffset, "unsupported compound constructor");
+        fContext.fErrors->error(c.fLine, "unsupported compound constructor");
     }
 }
 
@@ -1798,13 +1798,13 @@
                 const VarDeclaration& var = decls.declaration()->as<VarDeclaration>();
                 if (var.var().type().typeKind() == Type::TypeKind::kSampler) {
                     if (var.var().modifiers().fLayout.fBinding < 0) {
-                        fContext.fErrors->error(decls.fOffset,
+                        fContext.fErrors->error(decls.fLine,
                                                 "Metal samplers must have 'layout(binding=...)'");
                         return false;
                     }
                     if (var.var().type().dimensions() != SpvDim2D) {
                         // Not yet implemented--Skia currently only uses 2D textures.
-                        fContext.fErrors->error(decls.fOffset, "Unsupported texture dimensions");
+                        fContext.fErrors->error(decls.fLine, "Unsupported texture dimensions");
                         return false;
                     }
                     this->write(", texture2d<float> ");
@@ -1960,7 +1960,7 @@
         structType = &structType->componentType();
     }
     fIndentation++;
-    this->writeFields(structType->fields(), structType->fOffset, &intf);
+    this->writeFields(structType->fields(), structType->fLine, &intf);
     if (fProgram.fInputs.fUseFlipRTUniform) {
         this->writeLine("float2 " SKSL_RTFLIP_NAME ";");
     }
@@ -1982,7 +1982,7 @@
     this->writeLine(";");
 }
 
-void MetalCodeGenerator::writeFields(const std::vector<Type::Field>& fields, int parentOffset,
+void MetalCodeGenerator::writeFields(const std::vector<Type::Field>& fields, int parentLine,
                                      const InterfaceBlock* parentIntf) {
     MemoryLayout memoryLayout(MemoryLayout::kMetal_Standard);
     int currentOffset = 0;
@@ -1990,13 +1990,13 @@
         int fieldOffset = field.fModifiers.fLayout.fOffset;
         const Type* fieldType = field.fType;
         if (!MemoryLayout::LayoutIsSupported(*fieldType)) {
-            fContext.fErrors->error(parentOffset, "type '" + fieldType->name() +
-                                                  "' is not permitted here");
+            fContext.fErrors->error(parentLine, "type '" + fieldType->name() +
+                                                "' is not permitted here");
             return;
         }
         if (fieldOffset != -1) {
             if (currentOffset > fieldOffset) {
-                fContext.fErrors->error(parentOffset,
+                fContext.fErrors->error(parentLine,
                         "offset of field '" + field.fName + "' must be at least " +
                         to_string((int) currentOffset));
                 return;
@@ -2010,7 +2010,7 @@
             }
             int alignment = memoryLayout.alignment(*fieldType);
             if (fieldOffset % alignment) {
-                fContext.fErrors->error(parentOffset,
+                fContext.fErrors->error(parentLine,
                         "offset of field '" + field.fName + "' must be a multiple of " +
                         to_string((int) alignment));
                 return;
@@ -2018,7 +2018,7 @@
         }
         size_t fieldSize = memoryLayout.size(*fieldType);
         if (fieldSize > static_cast<size_t>(std::numeric_limits<int>::max() - currentOffset)) {
-            fContext.fErrors->error(parentOffset, "field offset overflow");
+            fContext.fErrors->error(parentLine, "field offset overflow");
             return;
         }
         currentOffset += fieldSize;
@@ -2213,7 +2213,7 @@
                 this->writeExpression(*r.expression(), Precedence::kTopLevel);
                 this->writeLine(";");
             } else {
-                fContext.fErrors->error(r.fOffset,
+                fContext.fErrors->error(r.fLine,
                         "Metal does not support returning '" +
                         r.expression()->type().description() + "' from main()");
             }
@@ -2249,7 +2249,7 @@
                     this->write("struct Uniforms {\n");
                     fUniformBuffer = uniformSet;
                 } else if (uniformSet != fUniformBuffer) {
-                    fContext.fErrors->error(decls.fOffset,
+                    fContext.fErrors->error(decls.fLine,
                             "Metal backend requires all uniforms to have the same "
                             "'layout(set=...)'");
                 }
@@ -2314,7 +2314,7 @@
 
                 int location = var.modifiers().fLayout.fLocation;
                 if (location < 0) {
-                    fContext.fErrors->error(var.fOffset,
+                    fContext.fErrors->error(var.fLine,
                             "Metal out variables must have 'layout(location=...)'");
                 } else if (fProgram.fConfig->fKind == ProgramKind::kVertex) {
                     this->write(" [[user(locn" + to_string(location) + ")]]");