feat: Prebuild iOS shader

Author: Berstanio

angle_metal_shader_prebuild.patch

@@ -0,0 +1,14 @@
+diff --git a/src/libANGLE/renderer/metal/metal_backend.gni b/src/libANGLE/renderer/metal/metal_backend.gni
+index d3a8a1d6e..6d3ebd624 100644
+--- a/src/libANGLE/renderer/metal/metal_backend.gni
++++ b/src/libANGLE/renderer/metal/metal_backend.gni
+@@ -92,8 +92,7 @@ metal_backend_sources = [
+ # We can build the ANGLE internal shaders at build-time if we have access to the Mac SDK in the "build" dir.
+ # Building internal shaders for iOS is not supported. The Chromium Mac SDK does not have all the required files.
+ # This is also an issue when cross-compiling for mac.
+-metal_internal_shader_compilation_supported =
+-    angle_has_build && !is_ios && target_os == host_os
++metal_internal_shader_compilation_supported = true
+ 
+ metal_internal_shaders_header =
+     "$root_gen_dir/angle/mtl_internal_shaders_metallib.h"

setup-angle.sh

@@ -29,6 +29,7 @@ apply_git_patch ../angle_include_fix.patch
 apply_git_patch ../angle_feature_util_fix.patch
 apply_git_patch ../angle_feature_util_metal_check.patch
 apply_git_patch ../angle_disable_posix_handler.patch
+apply_git_patch ../angle_metal_shader_prebuild.patch
 
 gn gen out/Debug-iphonesimulator_arm64 --args="is_debug=true enable_dsyms=true target_os=\"ios\" target_cpu=\"arm64\" ios_enable_code_signing=false angle_enable_metal=true angle_enable_gl=false angle_enable_null=false angle_enable_wgpu=false ios_deployment_target=\"11.0\" angle_build_all=false target_environment=\"simulator\""
 gn gen out/Debug-iphonesimulator_x86_64 --args="is_debug=true enable_dsyms=true target_os=\"ios\" target_cpu=\"x64\" ios_enable_code_signing=false angle_enable_metal=true angle_enable_gl=false angle_enable_null=false angle_enable_wgpu=false ios_deployment_target=\"11.0\" angle_build_all=false target_environment=\"simulator\""