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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Query.cpp: Implements the gl::Query class
#include "Query.h"
#include "main.h"
#include "Common/Thread.hpp"
namespace gl
{
Query::Query(GLuint name, GLenum type) : NamedObject(name)
{
mQuery = nullptr;
mStatus = GL_FALSE;
mResult = GL_FALSE;
mType = type;
}
Query::~Query()
{
delete mQuery;
}
void Query::begin()
{
if(!mQuery)
{
sw::Query::Type type;
switch(mType)
{
case GL_ANY_SAMPLES_PASSED:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
type = sw::Query::FRAGMENTS_PASSED;
break;
default:
ASSERT(false);
}
mQuery = new sw::Query(type);
if(!mQuery)
{
return error(GL_OUT_OF_MEMORY);
}
}
Device *device = getDevice();
mQuery->begin();
device->addQuery(mQuery);
device->setOcclusionEnabled(true);
}
void Query::end()
{
if(!mQuery)
{
return error(GL_INVALID_OPERATION);
}
Device *device = getDevice();
mQuery->end();
device->removeQuery(mQuery);
device->setOcclusionEnabled(false);
mStatus = GL_FALSE;
mResult = GL_FALSE;
}
GLuint Query::getResult()
{
if(mQuery)
{
while(!testQuery())
{
sw::Thread::yield();
}
}
return (GLuint)mResult;
}
GLboolean Query::isResultAvailable()
{
if(mQuery)
{
testQuery();
}
return mStatus;
}
GLenum Query::getType() const
{
return mType;
}
GLboolean Query::testQuery()
{
if(mQuery && mStatus != GL_TRUE)
{
if(!mQuery->building && mQuery->reference == 0)
{
unsigned int numPixels = mQuery->data;
mStatus = GL_TRUE;
switch(mType)
{
case GL_ANY_SAMPLES_PASSED:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
mResult = (numPixels > 0) ? GL_TRUE : GL_FALSE;
break;
default:
ASSERT(false);
}
}
return mStatus;
}
return GL_TRUE; // Prevent blocking when query is null
}
}