kc3-lang/angle/src/libANGLE/Stream.h

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• Hash : bda75597
  Author :
  Date : 2016-04-18T17:25:54
  

  Finish NV12 support via streams.
  
  The main functionality for NV12 texture support through EGL streams has
  been added. Updates to the compiler, texture code, and stream code were
  added to support binding to external D3D11 NV12 textures. An end2end test
  was also added to test sampling of YUV textures and converting to RGB.
  There is also a new script to convert BMP files to an NV12 texture ready
  to load into D3D11 for testing purposes.
  
  BUG=angleproject:1332
  
  Change-Id: I39b6ec393ea338e2c843fb911acc1b36cd1158a0
  Reviewed-on: https://chromium-review.googlesource.com/339454
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Ian Ewell <ewell@google.com>
  Reviewed-on: https://chromium-review.googlesource.com/341254
  Reviewed-by: Ian Ewell <ewell@google.com>
  

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• src/libANGLE/Stream.h

• //
  // Copyright (c) 2016 The ANGLE 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.
  //
  
  // Stream.h: Defines the egl::Stream class, representing the stream
  // where frames are streamed in. Implements EGLStreanKHR.
  
  #ifndef LIBANGLE_STREAM_H_
  #define LIBANGLE_STREAM_H_
  
  #include <array>
  
  #include <EGL/egl.h>
  #include <EGL/eglext.h>
  
  #include "common/angleutils.h"
  #include "libANGLE/AttributeMap.h"
  
  namespace rx
  {
  class StreamProducerImpl;
  }
  
  namespace gl
  {
  class Context;
  class Texture;
  }
  
  namespace egl
  {
  class Display;
  class Error;
  
  class Stream final : angle::NonCopyable
  {
    public:
      Stream(Display *display, const AttributeMap &attribs);
      ~Stream();
  
      enum class ConsumerType
      {
          NoConsumer,
          GLTextureRGB,
          GLTextureYUV,
      };
  
      enum class ProducerType
      {
          NoProducer,
          D3D11TextureNV12,
      };
  
      // A GL texture interpretation of a part of a producer frame. For use with GL texture consumers
      struct GLTextureDescription
      {
          unsigned int width;
          unsigned int height;
          unsigned int internalFormat;
          unsigned int mipLevels;
      };
  
      EGLenum getState() const;
  
      void setConsumerLatency(EGLint latency);
      EGLint getConsumerLatency() const;
  
      EGLuint64KHR getProducerFrame() const;
      EGLuint64KHR getConsumerFrame() const;
  
      void setConsumerAcquireTimeout(EGLint timeout);
      EGLint getConsumerAcquireTimeout() const;
  
      ConsumerType getConsumerType() const;
      ProducerType getProducerType() const;
  
      EGLint getPlaneCount() const;
  
      rx::StreamProducerImpl *getImplementation();
  
      // Consumer creation methods
      Error createConsumerGLTextureExternal(const AttributeMap &attributes, gl::Context *context);
  
      // Producer creation methods
      Error createProducerD3D11TextureNV12(const AttributeMap &attributes);
  
      // Consumer methods
      Error consumerAcquire();
      Error consumerRelease();
  
      // Some consumers are bound to GL contexts. This validates that a given context is bound to the
      // stream's consumer
      bool isConsumerBoundToContext(const gl::Context *context) const;
  
      // Producer methods
      Error validateD3D11NV12Texture(void *texture) const;
      Error postD3D11NV12Texture(void *texture, const AttributeMap &attributes);
  
    private:
      // Associated display
      Display *mDisplay;
  
      // Producer Implementation
      rx::StreamProducerImpl *mProducerImplementation;
  
      // Associated GL context. Note that this is a weak pointer used for validation purposes only,
      // and should never be arbitrarily dereferenced without knowing the context still exists as it
      // can become dangling at any time.
      gl::Context *mContext;
  
      // EGL defined attributes
      EGLint mState;
      EGLuint64KHR mProducerFrame;
      EGLuint64KHR mConsumerFrame;
      EGLint mConsumerLatency;
  
      // EGL gltexture consumer attributes
      EGLint mConsumerAcquireTimeout;
  
      // EGL gltexture yuv consumer attributes
      EGLint mPlaneCount;
      struct PlaneTexture
      {
          EGLint textureUnit;
          gl::Texture *texture;
      };
      // Texture units and textures for all the planes
      std::array<PlaneTexture, 3> mPlanes;
  
      // Consumer and producer types
      ConsumerType mConsumerType;
      ProducerType mProducerType;
  
      // ANGLE-only method, used internally
      friend class gl::Texture;
      void releaseTextures();
  };
  }  // namespace egl
  
  #endif  // LIBANGLE_STREAM_H_
  

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