Add GLStreamTextureImage

content/common/gpu/media/avda_codec_image.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_AVDA_CODEC_IMAGE_H_
 #define CONTENT_COMMON_GPU_MEDIA_AVDA_CODEC_IMAGE_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "content/common/gpu/media/avda_shared_state.h"
-#include "ui/gl/gl_image.h"
+#include "ui/gl/gl_stream_texture_image.h"
+
+namespace ui {
+class ScopedMakeCurrent;
+}
 
 namespace content {
 
 // GLImage that renders MediaCodec buffers to a SurfaceTexture or SurfaceView as
 // needed in order to draw them.
-class AVDACodecImage : public gl::GLImage {
+class AVDACodecImage : public gl::GLStreamTextureImage {
  public:
   AVDACodecImage(const scoped_refptr<AVDASharedState>&,
                  media::VideoCodecBridge* codec,
                  const base::WeakPtr<gpu::gles2::GLES2Decoder>& decoder,
                  const scoped_refptr<gfx::SurfaceTexture>& surface_texture);
 
  protected:
   ~AVDACodecImage() override;
 
  public:
   // gl::GLImage implementation
   void Destroy(bool have_context) override;
   gfx::Size GetSize() override;
   unsigned GetInternalFormat() override;
   bool BindTexImage(unsigned target) override;
   void ReleaseTexImage(unsigned target) override;
   bool CopyTexImage(unsigned target) override;
   bool CopyTexSubImage(unsigned target,
                        const gfx::Point& offset,
                        const gfx::Rect& rect) override;
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int z_order,
                             gfx::OverlayTransform transform,
                             const gfx::Rect& bounds_rect,
                             const gfx::RectF& crop_rect) override;
   void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd,
                     uint64_t process_tracing_id,
                     const std::string& dump_name) override;
+  // gl::GLStreamTextureMatrix implementation
+  void GetTextureMatrix(float xform[16]) override;
 
  public:
   // Decoded buffer index that has the image for us to display.
   void SetMediaCodecBufferIndex(int buffer_index);
 
   // Return the codec buffer that we will return to the codec, or
   // <0 if there is no such buffer.
   int GetMediaCodecBufferIndex() const;
 
   // Set the size of the current image.
   void SetSize(const gfx::Size& size);
 
   void SetMediaCodec(media::MediaCodecBridge* codec);
 
   void SetTexture(gpu::gles2::Texture* texture);
 
  private:
   enum { kInvalidCodecBufferIndex = -1 };
 
-  // Make sure that the surface texture's front buffer is current.
-  void UpdateSurfaceTexture();
+  // Make sure that the surface texture's front buffer is current.  This will
+  // save / restore the current context.  It will optionally restore the texture
+  // bindings in the surface texture's context, based on |mode|.  This is
+  // intended as a hint if we don't need to change contexts.  If we do need to
+  // change contexts, then we'll always preserve the texture bindings in the
+  // both contexts.  In other words, the caller is telling us whether it's
+  // okay to change the binding in the current context.
+  enum RestoreBindingsMode { kDontRestoreBindings, kDoRestoreBindings };
+  void UpdateSurfaceTexture(RestoreBindingsMode mode);
 
-  // Attach the surface texture to our GL context, with a texture that we
-  // create for it.
+  // Attach the surface texture to our GL context to whatever texture is bound
+  // on the active unit.
   void AttachSurfaceTextureToContext();
 
-  // Install the current texture matrix into the shader.
-  void InstallTextureMatrix();
+  // Make shared_state_->context() current if it isn't already.
+  scoped_ptr<ui::ScopedMakeCurrent> MakeCurrentIfNeeded();
+
+  // Return whether or not the current context is in the same share group as
+  // |surface_texture_|'s client texture.
+  // TODO(liberato): is this needed?
+  bool IsCorrectShareGroup() const;
+
+  // Return whether there is a codec buffer that we haven't rendered yet.  Will
+  // return false also if there's no codec or we otherwise can't update.
+  bool IsCodecBufferOutstanding() const;
 
   // Shared state between the AVDA and all AVDACodecImages.
   scoped_refptr<AVDASharedState> shared_state_;
 
   // The MediaCodec buffer index that we should render. Only valid if not equal
   // to |kInvalidCodecBufferIndex|.
   int codec_buffer_index_;
 
   // Our image size.
   gfx::Size size_;
 
   // May be null.
   media::MediaCodecBridge* media_codec_;
 
   const base::WeakPtr<gpu::gles2::GLES2Decoder> decoder_;
 
   // The SurfaceTexture to render to. This is null when rendering to a
   // SurfaceView.
   const scoped_refptr<gfx::SurfaceTexture> surface_texture_;
 
   // Should we detach |surface_texture_| from its GL context when we are
   // deleted?  This happens when it's using our Texture's texture handle.
   bool detach_surface_texture_on_destruction_;
 
   // The texture that we're attached to.
   gpu::gles2::Texture* texture_;
 
-  // Have we cached |texmatrix_uniform_location_| yet?
-  bool need_shader_info_;
-
-  // Uniform ID of the texture matrix in the shader.
-  GLint texmatrix_uniform_location_;
-
   // Texture matrix of the front buffer of the surface texture.
   float gl_matrix_[16];
 
   DISALLOW_COPY_AND_ASSIGN(AVDACodecImage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_AVDA_CODEC_IMAGE_H_