Fix iOS compilation issues.

Author: chinmaygarde

impeller/BUILD.gn

@@ -6,18 +6,23 @@ config("impeller_public_config") {
   include_dirs = [ ".." ]
 }
 
+is_host = is_mac || is_linux || is_win
+
 group("impeller") {
   public_deps = [
     "aiks",
     "archivist",
     "base",
-    "compiler",
     "display_list",
     "entity",
     "geometry",
     "image",
     "renderer",
   ]
+
+  if (is_host) {
+    public_deps += [ "compiler" ]
+  }
 }
 
 executable("impeller_unittests") {

impeller/archivist/BUILD.gn

@@ -5,10 +5,11 @@
 import("../tools/impeller.gni")
 
 impeller_component("archivist") {
-  # Only the umbrella header is public since all other TU's are implementation
-  # detail that will be compiled away in release modes.
-  # Because they are implementation details, they may expose dependency headers.
-  public = [ "archive.h" ]
+  public = [
+    "archivable.h",
+    "archive.h",
+    "archive_location.h",
+  ]
 
   sources = [
     "archivable.cc",
@@ -20,7 +21,6 @@ impeller_component("archivist") {
     "archive_database.cc",
     "archive_database.h",
     "archive_location.cc",
-    "archive_location.h",
     "archive_statement.cc",
     "archive_statement.h",
     "archive_transaction.cc",

impeller/entity/BUILD.gn

@@ -36,6 +36,7 @@ impeller_component("entity") {
   deps = [ ":entity_shaders" ]
 
   public_deps = [
+    "../archivist",
     "../image",
     "../renderer",
   ]

impeller/renderer/backend/metal/allocator_mtl.mm

@@ -41,7 +41,11 @@ static MTLResourceOptions ToMTLResourceOptions(StorageMode type) {
       return MTLResourceStorageModePrivate;
     case StorageMode::kDeviceTransient:
 #if OS_IOS
-      return MTLResourceStorageModeMemoryless;
+      if (@available(iOS 10.0, *)) {
+        return MTLResourceStorageModeMemoryless;
+      } else {
+        return MTLResourceStorageModePrivate;
+      }
 #else
       return MTLResourceStorageModePrivate;
 #endif
@@ -62,7 +66,11 @@ static MTLStorageMode ToMTLStorageMode(StorageMode mode) {
       return MTLStorageModePrivate;
     case StorageMode::kDeviceTransient:
 #if OS_IOS
-      return MTLStorageModeMemoryless;
+      if (@available(iOS 10.0, *)) {
+        return MTLStorageModeMemoryless;
+      } else {
+        return MTLStorageModePrivate;
+      }
 #else
       return MTLStorageModePrivate;
 #endif

impeller/renderer/backend/metal/device_buffer_mtl.mm

@@ -72,9 +72,18 @@
     ::memmove(dest + offset, source + source_range.offset, source_range.length);
   }
 
+// |RequiresExplicitHostSynchronization| always returns false on iOS. But the
+// compiler is mad that `didModifyRange:` appears in a TU meant for iOS. So,
+// just compile it away.
+//
+// Making this call is never necessary on iOS because there is no
+// MTLResourceStorageModeManaged mode. Only the MTLStorageModeShared mode is
+// available.
+#if !OS_IOS
   if (Allocator::RequiresExplicitHostSynchronization(mode_)) {
     [buffer_ didModifyRange:NSMakeRange(offset, source_range.length)];
   }
+#endif
 
   return true;
 }
@@ -97,7 +106,7 @@
   if (label.empty()) {
     return false;
   }
-  if (@available(macOS 10.12, *)) {
+  if (@available(macOS 10.12, iOS 10.0, *)) {
     [buffer_ addDebugMarker:@(label.c_str())
                       range:NSMakeRange(range.offset, range.length)];
   }

impeller/renderer/backend/metal/vertex_descriptor_mtl.mm

@@ -39,7 +39,7 @@ static MTLVertexFormat ReadStageInputFormat(const ShaderStageIOSlot& input) {
       if (input.bit_width == 8 * sizeof(float) / 2) {
         switch (input.vec_size) {
           case 1:
-            if (@available(macOS 10.13, *)) {
+            if (@available(macOS 10.13, iOS 11.0, *)) {
               return MTLVertexFormatHalf;
             } else {
               return MTLVertexFormatInvalid;
@@ -60,7 +60,7 @@ static MTLVertexFormat ReadStageInputFormat(const ShaderStageIOSlot& input) {
     }
     case ShaderType::kBoolean: {
       if (input.bit_width == 8 * sizeof(bool) && input.vec_size == 1) {
-        if (@available(macOS 10.13, *)) {
+        if (@available(macOS 10.13, iOS 11.0, *)) {
           return MTLVertexFormatChar;
         } else {
           return MTLVertexFormatInvalid;
@@ -72,7 +72,7 @@ static MTLVertexFormat ReadStageInputFormat(const ShaderStageIOSlot& input) {
       if (input.bit_width == 8 * sizeof(char)) {
         switch (input.vec_size) {
           case 1:
-            if (@available(macOS 10.13, *)) {
+            if (@available(macOS 10.13, iOS 11.0, *)) {
               return MTLVertexFormatChar;
             } else {
               return MTLVertexFormatInvalid;
@@ -91,7 +91,7 @@ static MTLVertexFormat ReadStageInputFormat(const ShaderStageIOSlot& input) {
       if (input.bit_width == 8 * sizeof(char)) {
         switch (input.vec_size) {
           case 1:
-            if (@available(macOS 10.13, *)) {
+            if (@available(macOS 10.13, iOS 11.0, *)) {
               return MTLVertexFormatUChar;
             } else {
               return MTLVertexFormatInvalid;
@@ -110,7 +110,7 @@ static MTLVertexFormat ReadStageInputFormat(const ShaderStageIOSlot& input) {
       if (input.bit_width == 8 * sizeof(short)) {
         switch (input.vec_size) {
           case 1:
-            if (@available(macOS 10.13, *)) {
+            if (@available(macOS 10.13, iOS 11.0, *)) {
               return MTLVertexFormatShort;
             } else {
               return MTLVertexFormatInvalid;
@@ -129,7 +129,7 @@ static MTLVertexFormat ReadStageInputFormat(const ShaderStageIOSlot& input) {
       if (input.bit_width == 8 * sizeof(ushort)) {
         switch (input.vec_size) {
           case 1:
-            if (@available(macOS 10.13, *)) {
+            if (@available(macOS 10.13, iOS 11.0, *)) {
               return MTLVertexFormatUShort;
             } else {
               return MTLVertexFormatInvalid;