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//
// 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_
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