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

webrtc/sdk/BUILD.gn

Index: webrtc/sdk/BUILD.gn
diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index 3e44f9b4a33c4a3d569369e970f9a16056e8e707..bea2731e4f470920f7dc7e6872a3f42ead21f5ba 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -7,6 +7,7 @@
 # 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")
 }
@@ -47,6 +48,8 @@ if (is_ios || is_mac) {
       "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",
@@ -67,7 +70,11 @@ if (is_ios || is_mac) {
         "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 += [
@@ -265,6 +272,21 @@ if (is_ios || is_mac) {
   }
 
   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"
@@ -307,6 +329,8 @@ if (is_ios || is_mac) {
         "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
@@ -324,6 +348,7 @@ if (is_ios || is_mac) {
       ]
 
       deps = [
+        ":metal_bundle",
         ":rtc_sdk_peerconnection_objc",
         "../system_wrappers:field_trial_default",
         "../system_wrappers:metrics_default",
@@ -336,6 +361,8 @@ if (is_ios || is_mac) {
         "CoreMedia.framework",
         "GLKit.framework",
         "VideoToolbox.framework",
+        "Metal.framework",
+        "MetalKit.framework",
       ]
 
       configs += [