Modify build scripts for ios .framework to compile metal shaders.

webrtc/sdk/BUILD.gn

 # Copyright 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../webrtc.gni")
+import("./objc/metal.gni")
 if (is_ios) {
   import("//build/config/ios/rules.gni")
 }
 
 group("sdk") {
   if (is_ios) {
     public_deps = [
       ":rtc_sdk_framework_objc",
     ]
   }
@@ skipping 20 matching lines @@
       "objc/Framework/Classes/NSString+StdString.h",
       "objc/Framework/Classes/NSString+StdString.mm",
       "objc/Framework/Classes/RTCDispatcher.m",
       "objc/Framework/Classes/RTCFieldTrials.mm",
       "objc/Framework/Classes/RTCLogging.mm",
       "objc/Framework/Classes/RTCMetrics.mm",
       "objc/Framework/Classes/RTCMetricsSampleInfo+Private.h",
       "objc/Framework/Classes/RTCMetricsSampleInfo.mm",
       "objc/Framework/Classes/RTCSSLAdapter.mm",
       "objc/Framework/Classes/RTCTracing.mm",
+      "objc/Framework/Classes/metal/RTCMTLRenderer.mm",
+      "objc/Framework/Classes/metal/RTCMTLVideoView.m",

[kthelgason, 2017/02/02 15:22:36]

Is it ok to include these on macOS as well? In fact, maybe it makes sense to
only include the metal renderer in the framework target, since we need the
shaders to be in a bundle?

[daniela-webrtc, 2017/02/02 15:36:54]

Great catch! They are not inteded to be included in this CL at all.

[daniela-webrtc, 2017/02/07 10:43:59]

Done.

       "objc/Framework/Headers/WebRTC/RTCDispatcher.h",
       "objc/Framework/Headers/WebRTC/RTCFieldTrials.h",
       "objc/Framework/Headers/WebRTC/RTCLogging.h",
       "objc/Framework/Headers/WebRTC/RTCMacros.h",
       "objc/Framework/Headers/WebRTC/RTCMetrics.h",
       "objc/Framework/Headers/WebRTC/RTCMetricsSampleInfo.h",
       "objc/Framework/Headers/WebRTC/RTCSSLAdapter.h",
       "objc/Framework/Headers/WebRTC/RTCTracing.h",
     ]
     if (is_ios) {
       sources += [
         "objc/Framework/Classes/RTCCameraPreviewView.m",
         "objc/Framework/Classes/RTCUIApplication.h",
         "objc/Framework/Classes/RTCUIApplication.mm",
         "objc/Framework/Classes/UIDevice+RTCDevice.mm",
         "objc/Framework/Classes/helpers.h",
         "objc/Framework/Classes/helpers.mm",
         "objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h",
         "objc/Framework/Headers/WebRTC/UIDevice+RTCDevice.h",
       ]
-      libs = [ "AVFoundation.framework" ]
+      libs = [
+        "AVFoundation.framework",
+        "Metal.framework",
+        "MetalKit.framework",
+      ]
     }
     if (!build_with_chromium) {
       sources += [
         "objc/Framework/Classes/RTCFileLogger.mm",
         "objc/Framework/Headers/WebRTC/RTCFileLogger.h",
       ]
     }
   }
 
   rtc_static_library("rtc_sdk_peerconnection_objc") {
@@ skipping 177 matching lines @@
 
       defines = [ "GTEST_RELATIVE_PATH" ]
       if (!build_with_chromium && is_clang) {
         # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
         suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
       }
     }
   }
 
   if (is_ios) {
+    compile_metal_lib("metal_lib") {
+      source = "objc/Framework/Classes/metal/Shaders.metal"
+    }
+
+    bundle_data("metal_bundle") {
+      public_deps = [
+        ":metal_lib",
+      ]
+      metal_sources = get_target_outputs(":metal_lib")
+      sources = metal_sources
+      outputs = [
+        "{{bundle_root_dir}}//rtc_shaders.metallib",
+      ]
+    }
+
     ios_framework_bundle("rtc_sdk_framework_objc") {
       info_plist = "objc/Framework/Info.plist"
       output_name = "WebRTC"
 
       common_objc_headers = [
         "objc/Framework/Headers/WebRTC/RTCAVFoundationVideoSource.h",
         "objc/Framework/Headers/WebRTC/RTCAudioSource.h",
         "objc/Framework/Headers/WebRTC/RTCAudioTrack.h",
         "objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h",
         "objc/Framework/Headers/WebRTC/RTCConfiguration.h",
@@ skipping 22 matching lines @@
         "objc/Framework/Headers/WebRTC/RTCRtpSender.h",
         "objc/Framework/Headers/WebRTC/RTCSSLAdapter.h",
         "objc/Framework/Headers/WebRTC/RTCSessionDescription.h",
         "objc/Framework/Headers/WebRTC/RTCTracing.h",
         "objc/Framework/Headers/WebRTC/RTCVideoFrame.h",
         "objc/Framework/Headers/WebRTC/RTCVideoRenderer.h",
         "objc/Framework/Headers/WebRTC/RTCVideoSource.h",
         "objc/Framework/Headers/WebRTC/RTCVideoTrack.h",
         "objc/Framework/Headers/WebRTC/UIDevice+RTCDevice.h",
         "objc/Framework/Headers/WebRTC/WebRTC.h",
+        "objc/Framework/Headers/WebRTC/RTCMTLRenderer.h",
+        "objc/Framework/Headers/WebRTC/RTCMTLVideoView.h",
       ]
 
       sources = common_objc_headers
       public_headers = common_objc_headers
 
       if (!build_with_chromium) {
         sources += [ "objc/Framework/Headers/WebRTC/RTCFileLogger.h" ]
         public_headers += [ "objc/Framework/Headers/WebRTC/RTCFileLogger.h" ]
       }
 
       ldflags = [
         "-all_load",
         "-install_name",
         "@rpath/$output_name.framework/$output_name",
       ]
 
       deps = [
+        ":metal_bundle",
         ":rtc_sdk_peerconnection_objc",
         "../system_wrappers:field_trial_default",
         "../system_wrappers:metrics_default",
       ]
 
       libs = [
         "AVFoundation.framework",
         "AudioToolbox.framework",
         "CoreGraphics.framework",
         "CoreMedia.framework",
         "GLKit.framework",
         "VideoToolbox.framework",
+        "Metal.framework",
+        "MetalKit.framework",
       ]
 
       configs += [
         "..:common_objc",
         "//build/config/compiler:enable_arc",
       ]
 
       public_configs = [ ":rtc_sdk_common_objc_config" ]
 
       if (!build_with_chromium && is_clang) {
@@ skipping 47 matching lines @@
       deps += [ "$rtc_libyuv_dir" ]
       public_deps = [
         "$rtc_libyuv_dir",
       ]
     } else {
       # Need to add a directory normally exported by libyuv.
       include_dirs = [ "$rtc_libyuv_dir/include" ]
     }
   }
 }