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//
// Copyright (c) 2002-2010 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.
//
// Fence.cpp: Implements the gl::Fence class, which supports the GL_NV_fence extension.
#include "libGLESv2/Fence.h"
#include "libGLESv2/main.h"
namespace gl
{
Fence::Fence(egl::Display* display)
{
mDisplay = display;
mQuery = NULL;
mCondition = GL_NONE;
mStatus = GL_FALSE;
}
Fence::~Fence()
{
if (mQuery != NULL)
{
mDisplay->freeEventQuery(mQuery);
}
}
GLboolean Fence::isFence()
{
// GL_NV_fence spec:
// A name returned by GenFencesNV, but not yet set via SetFenceNV, is not the name of an existing fence.
return mQuery != NULL;
}
void Fence::setFence(GLenum condition)
{
if (!mQuery)
{
mQuery = mDisplay->allocateEventQuery();
if (!mQuery)
{
return error(GL_OUT_OF_MEMORY);
}
}
HRESULT result = mQuery->Issue(D3DISSUE_END);
ASSERT(SUCCEEDED(result));
mCondition = condition;
mStatus = GL_FALSE;
}
GLboolean Fence::testFence()
{
if (mQuery == NULL)
{
return error(GL_INVALID_OPERATION, GL_TRUE);
}
HRESULT result = mQuery->GetData(NULL, 0, D3DGETDATA_FLUSH);
if (checkDeviceLost(result))
{
return error(GL_OUT_OF_MEMORY, GL_TRUE);
}
ASSERT(result == S_OK || result == S_FALSE);
mStatus = result == S_OK;
return mStatus;
}
void Fence::finishFence()
{
if (mQuery == NULL)
{
return error(GL_INVALID_OPERATION);
}
while (!testFence())
{
Sleep(0);
}
}
void Fence::getFenceiv(GLenum pname, GLint *params)
{
if (mQuery == NULL)
{
return error(GL_INVALID_OPERATION);
}
switch (pname)
{
case GL_FENCE_STATUS_NV:
{
// GL_NV_fence spec:
// Once the status of a fence has been finished (via FinishFenceNV) or tested and the returned status is TRUE (via either TestFenceNV
// or GetFenceivNV querying the FENCE_STATUS_NV), the status remains TRUE until the next SetFenceNV of the fence.
if (mStatus)
{
params[0] = GL_TRUE;
return;
}
HRESULT result = mQuery->GetData(NULL, 0, 0);
if (checkDeviceLost(result))
{
params[0] = GL_TRUE;
return error(GL_OUT_OF_MEMORY);
}
ASSERT(result == S_OK || result == S_FALSE);
mStatus = result == S_OK;
params[0] = mStatus;
break;
}
case GL_FENCE_CONDITION_NV:
params[0] = mCondition;
break;
default:
return error(GL_INVALID_ENUM);
break;
}
}
}
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