WebGL & 16-bit video stream: upload to FLOAT texture.

third_party/WebKit/public/platform/WebMediaPlayer.h

Index: third_party/WebKit/public/platform/WebMediaPlayer.h
diff --git a/third_party/WebKit/public/platform/WebMediaPlayer.h b/third_party/WebKit/public/platform/WebMediaPlayer.h
index 792328531796a3b0b2a1c7f682cfdaf51f79012e..68439a87c2b8b9f0eced4cbf8b7583a7fe7bd2c8 100644
--- a/third_party/WebKit/public/platform/WebMediaPlayer.h
+++ b/third_party/WebKit/public/platform/WebMediaPlayer.h
@@ -105,6 +105,14 @@ class WebMediaPlayer {
   typedef WebString TrackId;
   enum TrackType { TextTrack, AudioTrack, VideoTrack };
 
+  // This must stay in sync with WebGLRenderingContextBase::TexImageFunctionID.
+  enum TexImageFunctionID {
+    TexImage2D,
+    TexSubImage2D,
+    TexImage3D,
+    TexSubImage3D
+  };
+
   virtual ~WebMediaPlayer() {}
 
   virtual void load(LoadType, const WebMediaPlayerSource&, CORSMode) = 0;
@@ -208,6 +216,30 @@ class WebMediaPlayer {
     return false;
   }
 
+  // Do tex(Sub)Image2D/3D for current frame. If it is not implemented for given
+  // parameters or fails, it returns false.
+  // The method is wrapping calls to glTexImage2D, glTexSubImage2D,
+  // glTexImage3D and glTexSubImage3D and parameters have the same name and
+  // meaning.
+  // Texture needs to be created and bound to active texture unit before this
+  // call. In addition, TexSubImage2D and TexSubImage3D require that previous
+  // TexImage2D and TexSubImage3D calls, respectivelly, defined the texture
+  // content.
+  virtual bool texImageImpl(TexImageFunctionID functionID,

[pdr., 2016/12/02 21:17:07]

Does this need to be virtual?

[aleksandar.stojiljkovic, 2016/12/02 21:28:51]

Yes. It gets overridden in WebMediaPlayer_MS where we access current video
frame[1]. The method follows the approach and it is used in the the same use
case as virtual bool copyVideoTextureToPlatformTexture, virtual bool
copyVideoTextureToPlatformTexture and virtual bool
copyVideoSubTextureToPlatformTexture methods.

[1] compositor_->GetCurrentFrameWithoutUpdatingStatistics()
https://codereview.chromium.org/2476693002/diff/240001/content/renderer/media...

+                            unsigned target,
+                            gpu::gles2::GLES2Interface* gl,
+                            int level,
+                            int internalformat,
+                            unsigned format,
+                            unsigned type,
+                            int xoffset,
+                            int yoffset,
+                            int zoffset,
+                            bool flipY,
+                            bool premultiplyAlpha) {
+    return false;
+  }
+
   virtual WebAudioSourceProvider* getAudioSourceProvider() { return nullptr; }
 
   virtual void setContentDecryptionModule(