kc3-lang/angle/src/libANGLE/renderer/gl/QueryGL.h

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• Hash : f0aa8429
  Author :
  Date : 2015-09-29T15:08:34
  

  Implement QueryGL.
  
  Passes all tests in:
   * dEQP-GLES3.functional.occlusion_query
   * angle_end2end_tests
  
  BUG=angleproject:887
  
  Change-Id: I643ab4c28cb545de9e7b0e1740e3fd8e2aa9d3d9
  Reviewed-on: https://chromium-review.googlesource.com/302338
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tryjob-Request: Geoff Lang <geofflang@chromium.org>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/gl/QueryGL.h

• //
  // Copyright 2015 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.
  //
  
  // QueryGL.h: Defines the class interface for QueryGL.
  
  #ifndef LIBANGLE_RENDERER_GL_QUERYGL_H_
  #define LIBANGLE_RENDERER_GL_QUERYGL_H_
  
  #include <deque>
  
  #include "libANGLE/renderer/QueryImpl.h"
  
  namespace rx
  {
  
  class FunctionsGL;
  class StateManagerGL;
  
  class QueryGL : public QueryImpl
  {
    public:
      QueryGL(GLenum type, const FunctionsGL *functions, StateManagerGL *stateManager);
      ~QueryGL() override;
  
      gl::Error begin() override;
      gl::Error end() override;
      gl::Error getResult(GLuint *params) override;
      gl::Error isResultAvailable(GLuint *available) override;
  
      // OpenGL is only allowed to have one query of each type active at any given time. Since ANGLE
      // virtualizes contexts, queries need to be able to be paused and resumed.
      // A query is "paused" by ending it and pushing the ID into a list of queries awaiting readback.
      // When it is "resumed", a new query is generated and started.
      // When a result is required, the queries are "flushed" by iterating over the list of pending
      // queries and merging their results.
      gl::Error pause();
      gl::Error resume();
  
    private:
      gl::Error flush(bool force);
  
      GLenum mType;
  
      const FunctionsGL *mFunctions;
      StateManagerGL *mStateManager;
  
      GLuint mActiveQuery;
      std::deque<GLuint> mPendingQueries;
      GLuint mResultSum;
  };
  
  }
  
  #endif // LIBANGLE_RENDERER_GL_QUERYGL_H_
  

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