// Copyright 2018 The Dawn Authors
//
// 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.

#include "dawn_native/ProgrammablePassEncoder.h"

#include "dawn_native/BindGroup.h"
#include "dawn_native/Buffer.h"
#include "dawn_native/CommandBuffer.h"
#include "dawn_native/Commands.h"
#include "dawn_native/Device.h"
#include "dawn_native/ValidationUtils_autogen.h"

#include <cstring>

namespace dawn_native {

    ProgrammablePassEncoder::ProgrammablePassEncoder(DeviceBase* device,
                                                     EncodingContext* encodingContext)
        : ObjectBase(device), mEncodingContext(encodingContext) {
    }

    ProgrammablePassEncoder::ProgrammablePassEncoder(DeviceBase* device,
                                                     EncodingContext* encodingContext,
                                                     ErrorTag errorTag)
        : ObjectBase(device, errorTag), mEncodingContext(encodingContext) {
    }

    void ProgrammablePassEncoder::InsertDebugMarker(const char* groupLabel) {
        mEncodingContext->TryEncode(this, [&](CommandAllocator* allocator) -> MaybeError {
            InsertDebugMarkerCmd* cmd =
                allocator->Allocate<InsertDebugMarkerCmd>(Command::InsertDebugMarker);
            cmd->length = strlen(groupLabel);

            char* label = allocator->AllocateData<char>(cmd->length + 1);
            memcpy(label, groupLabel, cmd->length + 1);

            return {};
        });
    }

    void ProgrammablePassEncoder::PopDebugGroup() {
        mEncodingContext->TryEncode(this, [&](CommandAllocator* allocator) -> MaybeError {
            allocator->Allocate<PopDebugGroupCmd>(Command::PopDebugGroup);

            return {};
        });
    }

    void ProgrammablePassEncoder::PushDebugGroup(const char* groupLabel) {
        mEncodingContext->TryEncode(this, [&](CommandAllocator* allocator) -> MaybeError {
            PushDebugGroupCmd* cmd =
                allocator->Allocate<PushDebugGroupCmd>(Command::PushDebugGroup);
            cmd->length = strlen(groupLabel);

            char* label = allocator->AllocateData<char>(cmd->length + 1);
            memcpy(label, groupLabel, cmd->length + 1);

            return {};
        });
    }

    void ProgrammablePassEncoder::SetBindGroup(uint32_t groupIndex,
                                               BindGroupBase* group,
                                               uint32_t dynamicOffsetCount,
                                               const uint64_t* dynamicOffsets) {
        mEncodingContext->TryEncode(this, [&](CommandAllocator* allocator) -> MaybeError {
            const BindGroupLayoutBase* layout = group->GetLayout();

            DAWN_TRY(GetDevice()->ValidateObject(group));

            if (groupIndex >= kMaxBindGroups) {
                return DAWN_VALIDATION_ERROR("Setting bind group over the max");
            }

            // Dynamic offsets count must match the number required by the layout perfectly.
            if (layout->GetDynamicBufferCount() != dynamicOffsetCount) {
                return DAWN_VALIDATION_ERROR("dynamicOffset count mismatch");
            }

            for (uint32_t i = 0; i < dynamicOffsetCount; ++i) {
                if (dynamicOffsets[i] % kMinDynamicBufferOffsetAlignment != 0) {
                    return DAWN_VALIDATION_ERROR("Dynamic Buffer Offset need to be aligned");
                }

                BufferBinding bufferBinding = group->GetBindingAsBufferBinding(i);

                // During BindGroup creation, validation ensures binding offset + binding size <=
                // buffer size.
                DAWN_ASSERT(bufferBinding.buffer->GetSize() >= bufferBinding.size);
                DAWN_ASSERT(bufferBinding.buffer->GetSize() - bufferBinding.size >=
                            bufferBinding.offset);

                if ((dynamicOffsets[i] >
                     bufferBinding.buffer->GetSize() - bufferBinding.offset - bufferBinding.size)) {
                    return DAWN_VALIDATION_ERROR("dynamic offset out of bounds");
                }
            }

            SetBindGroupCmd* cmd = allocator->Allocate<SetBindGroupCmd>(Command::SetBindGroup);
            cmd->index = groupIndex;
            cmd->group = group;
            cmd->dynamicOffsetCount = dynamicOffsetCount;
            if (dynamicOffsetCount > 0) {
                uint64_t* offsets = allocator->AllocateData<uint64_t>(cmd->dynamicOffsetCount);
                memcpy(offsets, dynamicOffsets, dynamicOffsetCount * sizeof(uint64_t));
            }

            return {};
        });
    }

}  // namespace dawn_native