preliminary SkSL Metal backend

Bug: skia:
Change-Id: I03e839fb4f1061bc6d1b1b72d54fd39ca7bd7b84
Reviewed-on: https://skia-review.googlesource.com/51245
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/src/sksl/SkSLMain.cpp b/src/sksl/SkSLMain.cpp
index 9f1fec1f1b..8ba0933f8c 100644
--- a/src/sksl/SkSLMain.cpp
+++ b/src/sksl/SkSLMain.cpp
@@ -93,6 +93,22 @@ int main(int argc, const char** argv) {
             printf("error writing '%s'\n", argv[2]);
             exit(4);
         }
+    } else if (name.endsWith(".metal")) {
+        SkSL::FileOutputStream out(argv[2]);
+        SkSL::Compiler compiler;
+        if (!out.isValid()) {
+            printf("error writing '%s'\n", argv[2]);
+            exit(4);
+        }
+        std::unique_ptr<SkSL::Program> program = compiler.convertProgram(kind, text, settings);
+        if (!program || !compiler.toMetal(*program, out)) {
+            printf("%s", compiler.errorText().c_str());
+            exit(3);
+        }
+        if (!out.close()) {
+            printf("error writing '%s'\n", argv[2]);
+            exit(4);
+        }
     } else if (name.endsWith(".h")) {
         SkSL::FileOutputStream out(argv[2]);
         SkSL::Compiler compiler(SkSL::Compiler::kPermitInvalidStaticTests_Flag);
@@ -128,6 +144,7 @@ int main(int argc, const char** argv) {
             exit(4);
         }
     } else {
-        printf("expected output filename to end with '.spirv', '.glsl', '.cpp', or '.h'");
+        printf("expected output filename to end with '.spirv', '.glsl', '.cpp', '.h', or '.metal'");
+        exit(1);
     }
 }