// 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/RenderPassEncoder.h"

#include "dawn_native/Buffer.h"
#include "dawn_native/CommandBuffer.h"
#include "dawn_native/Commands.h"
#include "dawn_native/RenderPipeline.h"

#include <string.h>

namespace dawn_native {

    RenderPassEncoderBase::RenderPassEncoderBase(DeviceBase* device,
                                                 CommandBufferBuilder* topLevelBuilder,
                                                 CommandAllocator* allocator)
        : ProgrammablePassEncoder(device, topLevelBuilder, allocator) {
    }

    void RenderPassEncoderBase::Draw(uint32_t vertexCount,
                                     uint32_t instanceCount,
                                     uint32_t firstVertex,
                                     uint32_t firstInstance) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        DrawCmd* draw = mAllocator->Allocate<DrawCmd>(Command::Draw);
        new (draw) DrawCmd;
        draw->vertexCount = vertexCount;
        draw->instanceCount = instanceCount;
        draw->firstVertex = firstVertex;
        draw->firstInstance = firstInstance;
    }

    void RenderPassEncoderBase::DrawIndexed(uint32_t indexCount,
                                            uint32_t instanceCount,
                                            uint32_t firstIndex,
                                            uint32_t baseVertex,
                                            uint32_t firstInstance) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        DrawIndexedCmd* draw = mAllocator->Allocate<DrawIndexedCmd>(Command::DrawIndexed);
        new (draw) DrawIndexedCmd;
        draw->indexCount = indexCount;
        draw->instanceCount = instanceCount;
        draw->firstIndex = firstIndex;
        draw->baseVertex = baseVertex;
        draw->firstInstance = firstInstance;
    }

    void RenderPassEncoderBase::SetPipeline(RenderPipelineBase* pipeline) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        if (pipeline == nullptr) {
            mTopLevelBuilder->HandleError("Pipeline cannot be null");
            return;
        }

        SetRenderPipelineCmd* cmd =
            mAllocator->Allocate<SetRenderPipelineCmd>(Command::SetRenderPipeline);
        new (cmd) SetRenderPipelineCmd;
        cmd->pipeline = pipeline;
    }

    void RenderPassEncoderBase::SetStencilReference(uint32_t reference) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        SetStencilReferenceCmd* cmd =
            mAllocator->Allocate<SetStencilReferenceCmd>(Command::SetStencilReference);
        new (cmd) SetStencilReferenceCmd;
        cmd->reference = reference;
    }

    void RenderPassEncoderBase::SetBlendColor(float r, float g, float b, float a) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        SetBlendColorCmd* cmd = mAllocator->Allocate<SetBlendColorCmd>(Command::SetBlendColor);
        new (cmd) SetBlendColorCmd;
        cmd->r = r;
        cmd->g = g;
        cmd->b = b;
        cmd->a = a;
    }

    void RenderPassEncoderBase::SetScissorRect(uint32_t x,
                                               uint32_t y,
                                               uint32_t width,
                                               uint32_t height) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        SetScissorRectCmd* cmd = mAllocator->Allocate<SetScissorRectCmd>(Command::SetScissorRect);
        new (cmd) SetScissorRectCmd;
        cmd->x = x;
        cmd->y = y;
        cmd->width = width;
        cmd->height = height;
    }

    void RenderPassEncoderBase::SetIndexBuffer(BufferBase* buffer, uint32_t offset) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        if (buffer == nullptr) {
            mTopLevelBuilder->HandleError("Buffer cannot be null");
            return;
        }

        SetIndexBufferCmd* cmd = mAllocator->Allocate<SetIndexBufferCmd>(Command::SetIndexBuffer);
        new (cmd) SetIndexBufferCmd;
        cmd->buffer = buffer;
        cmd->offset = offset;
    }

    void RenderPassEncoderBase::SetVertexBuffers(uint32_t startSlot,
                                                 uint32_t count,
                                                 BufferBase* const* buffers,
                                                 uint32_t const* offsets) {
        if (mTopLevelBuilder->ConsumedError(ValidateCanRecordCommands())) {
            return;
        }

        for (size_t i = 0; i < count; ++i) {
            if (buffers[i] == nullptr) {
                mTopLevelBuilder->HandleError("Buffers cannot be null");
                return;
            }
        }

        SetVertexBuffersCmd* cmd =
            mAllocator->Allocate<SetVertexBuffersCmd>(Command::SetVertexBuffers);
        new (cmd) SetVertexBuffersCmd;
        cmd->startSlot = startSlot;
        cmd->count = count;

        Ref<BufferBase>* cmdBuffers = mAllocator->AllocateData<Ref<BufferBase>>(count);
        for (size_t i = 0; i < count; ++i) {
            new (&cmdBuffers[i]) Ref<BufferBase>(buffers[i]);
        }

        uint32_t* cmdOffsets = mAllocator->AllocateData<uint32_t>(count);
        memcpy(cmdOffsets, offsets, count * sizeof(uint32_t));
    }

}  // namespace dawn_native