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

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• Author : Ian Ewell
  Date : 2016-01-22 16:09:42
  Hash : 3ffd78bc
  Message : Add initial support for EXT_disjoint_timer_query. Basic timer queries are supported and tested in the OpenGL backend but are not enabled by default. A good portion of the existing query code was also refactored for improved validation - specifically for validating that the appropriate extensions are available. BUG=angleproject:1265 Change-Id: Iebae994cd7a8d3ed3e9fc3776fe2f3d99caa9237 Reviewed-on: https://chromium-review.googlesource.com/323450 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tryjob-Request: Ian Ewell <ewell@google.com> Tested-by: Ian Ewell <ewell@google.com>

• 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 queryCounter() override;
      gl::Error getResult(GLint *params) override;
      gl::Error getResult(GLuint *params) override;
      gl::Error getResult(GLint64 *params) override;
      gl::Error getResult(GLuint64 *params) override;
      gl::Error isResultAvailable(bool *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);
  
      template <typename T>
      gl::Error getResultBase(T *params);
  
      GLenum mType;
  
      const FunctionsGL *mFunctions;
      StateManagerGL *mStateManager;
  
      GLuint mActiveQuery;
      std::deque<GLuint> mPendingQueries;
      GLuint64 mResultSum;
  };
  
  }
  
  #endif // LIBANGLE_RENDERER_GL_QUERYGL_H_