/*
 *  Copyright 2019-2021 Diligent Graphics LLC
 *  Copyright 2015-2019 Egor Yusov
 *  
 *  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.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#include "TopLevelASBase.hpp"

namespace Diligent
{

void ValidateTopLevelASDesc(const TopLevelASDesc& Desc) noexcept(false)
{
#define LOG_TLAS_ERROR_AND_THROW(...) LOG_ERROR_AND_THROW("Description of a top-level AS '", (Desc.Name ? Desc.Name : ""), "' is invalid: ", ##__VA_ARGS__)

    if (Desc.CompactedSize > 0)
    {
        if (Desc.MaxInstanceCount != 0)
        {
            LOG_TLAS_ERROR_AND_THROW("If non-zero CompactedSize is specified, MaxInstanceCount must be zero.");
        }

        if (Desc.Flags != RAYTRACING_BUILD_AS_NONE)
        {
            LOG_TLAS_ERROR_AND_THROW("If non-zero CompactedSize is specified, Flags must be RAYTRACING_BUILD_AS_NONE.");
        }
    }
    else
    {
        if (Desc.MaxInstanceCount == 0)
        {
            LOG_TLAS_ERROR_AND_THROW("MaxInstanceCount must not be zero.");
        }

        if ((Desc.Flags & RAYTRACING_BUILD_AS_PREFER_FAST_TRACE) != 0 && (Desc.Flags & RAYTRACING_BUILD_AS_PREFER_FAST_BUILD) != 0)
        {
            LOG_TLAS_ERROR_AND_THROW("RAYTRACING_BUILD_AS_PREFER_FAST_TRACE and RAYTRACING_BUILD_AS_PREFER_FAST_BUILD flags are mutually exclusive.");
        }
    }

#undef LOG_TLAS_ERROR_AND_THROW
}

} // namespace Diligent