/****************************************************************************
 Copyright (c) 2020-2023 Xiamen Yaji Software Co., Ltd.

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 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights to
 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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****************************************************************************/

#include "RenderQueue.h"

#include <utility>
#include "PipelineSceneData.h"
#include "PipelineStateManager.h"
#include "RenderPipeline.h"
#include "gfx-base/GFXCommandBuffer.h"
#include "gfx-base/GFXDevice.h"
#include "gfx-base/GFXShader.h"
#include "scene/Model.h"
#include "scene/Pass.h"
#include "scene/SubModel.h"

namespace cc {
namespace pipeline {

RenderQueue::RenderQueue(RenderPipeline *pipeline, RenderQueueCreateInfo desc, bool useOcclusionQuery)
: _pipeline(pipeline), _passDesc(std::move(desc)), _useOcclusionQuery(useOcclusionQuery) {
}

void RenderQueue::clear() {
    _queue.clear();
}

bool RenderQueue::insertRenderPass(const RenderObject &renderObj, uint32_t subModelIdx, uint32_t passIdx) {
    const auto *subModel = renderObj.model->getSubModels()[subModelIdx].get();
    const auto *const pass = subModel->getPass(passIdx);
    const bool isTransparent = pass->getBlendState()->targets[0].blend;

    if (isTransparent != _passDesc.isTransparent || !(pass->getPhase() & _passDesc.phases)) {
        return false;
    }

    auto passPriority = static_cast<uint32_t>(pass->getPriority());
    auto modelPriority = static_cast<uint32_t>(subModel->getPriority());
    auto shaderId = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(subModel->getShader(passIdx)));
    const auto hash = (0 << 30) | (passPriority << 16) | (modelPriority << 8) | passIdx;
    const auto priority = renderObj.model->getPriority();
    RenderPass renderPass = {priority, hash, renderObj.depth, shaderId, passIdx, subModel};
    _queue.emplace_back(renderPass);

    return true;
}

void RenderQueue::sort() {
#if CC_PLATFORM != CC_PLATFORM_LINUX && CC_PLATFORM != CC_PLATFORM_QNX
    std::sort(_queue.begin(), _queue.end(), _passDesc.sortFunc);
#else
    //cannot use std::function as comparator in algorithms https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65942#c11
    std::sort(_queue.begin(), _queue.end(), [this](const RenderPass &a, const RenderPass &b) -> bool {
        return _passDesc.sortFunc(a, b);
    });
#endif
}

void RenderQueue::recordCommandBuffer(gfx::Device * /*device*/, scene::Camera *camera, gfx::RenderPass *renderPass, gfx::CommandBuffer *cmdBuff, uint32_t subpassIndex) {
    PipelineSceneData *const sceneData = _pipeline->getPipelineSceneData();
    bool enableOcclusionQuery = _pipeline->isOcclusionQueryEnabled() && _useOcclusionQuery;
    auto *queryPool = _pipeline->getQueryPools()[0];
    for (auto &i : _queue) {
        const auto *subModel = i.subModel;
        if (enableOcclusionQuery) {
            cmdBuff->beginQuery(queryPool, subModel->getId());
        }

        if (enableOcclusionQuery && _pipeline->isOccluded(camera, subModel)) {
            gfx::InputAssembler *inputAssembler = sceneData->getOcclusionQueryInputAssembler();
            const scene::Pass *pass = sceneData->getOcclusionQueryPass();
            gfx::Shader *shader = sceneData->getOcclusionQueryShader();
            auto *pso = PipelineStateManager::getOrCreatePipelineState(pass, shader, inputAssembler, renderPass, subpassIndex);

            cmdBuff->bindPipelineState(pso);
            cmdBuff->bindDescriptorSet(materialSet, pass->getDescriptorSet());
            cmdBuff->bindDescriptorSet(localSet, subModel->getWorldBoundDescriptorSet());
            cmdBuff->bindInputAssembler(inputAssembler);
            cmdBuff->draw(inputAssembler);
        } else {
            const auto passIdx = i.passIndex;
            auto *inputAssembler = subModel->getInputAssembler();
            const auto *pass = subModel->getPass(passIdx);
            auto *shader = subModel->getShader(passIdx);
            auto *pso = PipelineStateManager::getOrCreatePipelineState(pass, shader, inputAssembler, renderPass, subpassIndex);

            cmdBuff->bindPipelineState(pso);
            cmdBuff->bindDescriptorSet(materialSet, pass->getDescriptorSet());
            cmdBuff->bindDescriptorSet(localSet, subModel->getDescriptorSet());
            cmdBuff->bindInputAssembler(inputAssembler);
            cmdBuff->draw(inputAssembler);
        }

        if (enableOcclusionQuery) {
            cmdBuff->endQuery(queryPool, subModel->getId());
        }
    }
}

} // namespace pipeline
} // namespace cc