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

third_party/WebKit/public/platform/WebMediaPlayer.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 87 matching lines @@
   enum LoadType {
     LoadTypeURL = 0,
     LoadTypeMediaSource = 1,
     LoadTypeMediaStream = 2,
     LoadTypeMax = LoadTypeMediaStream,
   };
 
   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;
 
   // Playback controls.
   virtual void play() = 0;
   virtual void pause() = 0;
   virtual bool supportsSave() const = 0;
   virtual void seek(double seconds) = 0;
   virtual void setRate(double) = 0;
@@ skipping 83 matching lines @@
                                                     unsigned target,
                                                     unsigned texture,
                                                     int level,
                                                     int xoffset,
                                                     int yoffset,
                                                     bool premultiplyAlpha,
                                                     bool flipY) {
     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(
       WebContentDecryptionModule* cdm,
       WebContentDecryptionModuleResult result) {
     result.completeWithError(
         WebContentDecryptionModuleExceptionNotSupportedError, 0, "ERROR");
   }
 
   // Sets the poster image URL.
@@ skipping 10 matching lines @@
 
   virtual void enabledAudioTracksChanged(
       const WebVector<TrackId>& enabledTrackIds) {}
   // |selectedTrackId| is null if no track is selected.
   virtual void selectedVideoTrackChanged(TrackId* selectedTrackId) {}
 };
 
 }  // namespace blink
 
 #endif