GLboolean Query::testQuery()
{
if (mQuery != NULL && mStatus != GL_TRUE)
{
DWORD numPixels = 0;
HRESULT hres = mQuery->GetData(&numPixels, sizeof(DWORD), D3DGETDATA_FLUSH);
if (hres == S_OK)
{
mStatus = GL_TRUE;
switch (mType)
{
case GL_ANY_SAMPLES_PASSED_EXT:
case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
mResult = (numPixels > 0) ? GL_TRUE : GL_FALSE;
break;
default:
ASSERT(false);
}
}
else if (checkDeviceLost(hres))
{
return error(GL_OUT_OF_MEMORY, GL_TRUE);
}
return mStatus;
}
return GL_TRUE; // prevent blocking when query is null
}
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::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;
}
}
