GPU: Move gl_FragStencilRefARB to be scanned and added to created info

source/blender/gpu/glsl_preprocess/glsl_preprocess.hh

@@ -49,6 +49,7 @@ static uint64_t hash(const std::string &name)
 
 enum Builtin : uint64_t {
   FragCoord = hash("gl_FragCoord"),
+  FragStencilRef = hash("gl_FragStencilRefARB"),
   FrontFacing = hash("gl_FrontFacing"),
   GlobalInvocationID = hash("gl_GlobalInvocationID"),
   InstanceID = hash("gl_InstanceID"),
@@ -1345,6 +1346,7 @@ class Preprocessor {
     using namespace metadata;
     /* TODO: This can trigger false positive caused by disabled #if blocks. */
     std::string tokens[] = {"gl_FragCoord",
+                            "gl_FragStencilRefARB",
                             "gl_FrontFacing",
                             "gl_GlobalInvocationID",
                             "gl_InstanceID",

source/blender/gpu/intern/gpu_shader_create_info.hh

@@ -446,6 +446,7 @@ enum class BuiltinBits {
    * \note Emulated on OpenGL.
    */
   BARYCENTRIC_COORD = (1 << 0),
+  STENCIL_REF = (1 << 1),
   FRAG_COORD = (1 << 2),
   FRONT_FACING = (1 << 4),
   GLOBAL_INVOCATION_ID = (1 << 5),

source/blender/gpu/intern/gpu_shader_dependency.cc

@@ -77,6 +77,8 @@ struct GPUSource {
     switch (builtin) {
       case Builtin::FragCoord:
         return BuiltinBits::FRAG_COORD;
+      case Builtin::FragStencilRef:
+        return BuiltinBits::STENCIL_REF;
       case Builtin::FrontFacing:
         return BuiltinBits::FRONT_FACING;
       case Builtin::GlobalInvocationID:

source/blender/gpu/metal/mtl_shader_generator.mm

@@ -556,9 +556,7 @@ bool MTLShader::generate_msl_from_glsl(const shader::ShaderCreateInfo *info)
                                   shd_builder_->glsl_fragment_source_.find("gl_FragDepth") !=
                                       std::string::npos;
 
-    /* TODO(fclem): Add to create info. */
-    msl_iface.uses_gl_FragStencilRefARB = shd_builder_->glsl_fragment_source_.find(
-                                              "gl_FragStencilRefARB") != std::string::npos;
+    msl_iface.uses_gl_FragStencilRefARB = bool(info->builtins_ & BuiltinBits::STENCIL_REF);
 
     msl_iface.depth_write = info->depth_write_;