85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* Copyright (C) 2006-2010 - Frictional Games
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*
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* This file is part of HPL1 Engine.
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*/
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#include "hpl1/engine/impl/OcclusionQueryOGL.h"
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#ifdef HPL1_USE_OPENGL
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namespace hpl {
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//////////////////////////////////////////////////////////////////////////
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// CONSTRUCTORS
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//////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------
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cOcclusionQueryOGL::cOcclusionQueryOGL() {
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glGenQueries(1, (GLuint *)&mlQueryId);
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mlLastSampleCount = 0;
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}
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//-----------------------------------------------------------------------
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cOcclusionQueryOGL::~cOcclusionQueryOGL() {
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glDeleteQueries(1, (GLuint *)&mlQueryId);
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}
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//-----------------------------------------------------------------------
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//////////////////////////////////////////////////////////////////////////
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// PUBLIC METHODS
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//////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------
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void cOcclusionQueryOGL::Begin() {
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glBeginQuery(GL_SAMPLES_PASSED, mlQueryId);
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}
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void cOcclusionQueryOGL::End() {
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glEndQuery(GL_SAMPLES_PASSED);
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}
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bool cOcclusionQueryOGL::FetchResults() {
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int lAvailable = 0;
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glGetQueryObjectiv(mlQueryId, GL_QUERY_RESULT_AVAILABLE, (GLint *)&lAvailable);
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if (lAvailable == 0)
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return false;
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glGetQueryObjectiv(mlQueryId, GL_QUERY_RESULT, (GLint *)&mlLastSampleCount);
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return true;
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}
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unsigned int cOcclusionQueryOGL::GetSampleCount() {
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return mlLastSampleCount;
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}
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//-----------------------------------------------------------------------
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} // namespace hpl
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#endif // HL1_USE_OPENGL
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