cocos_lib/cocos/scene/RenderWindow.cpp

/****************************************************************************
 Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.

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#include "scene/RenderWindow.h"
#include "BasePlatform.h"
#include "interfaces/modules/ISystemWindow.h"
#include "interfaces/modules/ISystemWindowManager.h"
#include "platform/interfaces/modules/Device.h"
#include "renderer/gfx-base/GFXDevice.h"
#include "renderer/gfx-base/GFXFramebuffer.h"
#include "renderer/gfx-base/GFXSwapchain.h"
#include "renderer/gfx-base/GFXTexture.h"
#include "scene/Camera.h"

namespace cc {
namespace scene {

namespace {

const ccstd::unordered_map<IScreen::Orientation, gfx::SurfaceTransform> ORIENTATION_MAP{
    {IScreen::Orientation::PORTRAIT, gfx::SurfaceTransform::IDENTITY},
    {IScreen::Orientation::LANDSCAPE_RIGHT, gfx::SurfaceTransform::ROTATE_90},
    {IScreen::Orientation::PORTRAIT_UPSIDE_DOWN, gfx::SurfaceTransform::ROTATE_180},
    {IScreen::Orientation::LANDSCAPE_LEFT, gfx::SurfaceTransform::ROTATE_270},
};

}

RenderWindow::RenderWindow() = default;
RenderWindow::~RenderWindow() = default;

bool RenderWindow::initialize(gfx::Device *device, IRenderWindowInfo &info) {
    if (info.title.has_value() && !info.title.value().empty()) {
        _title = info.title.value();
    }

    if (info.swapchain != nullptr) {
        _swapchain = info.swapchain;
    }

    _width = info.width;
    _height = info.height;

    _renderPass = device->createRenderPass(info.renderPassInfo);

    if (info.swapchain != nullptr) {
        _swapchain = info.swapchain;
        _colorTextures.pushBack(info.swapchain->getColorTexture());
        _depthStencilTexture = info.swapchain->getDepthStencilTexture();
    } else {
        for (auto &colorAttachment : info.renderPassInfo.colorAttachments) {
            gfx::TextureInfo textureInfo = {gfx::TextureType::TEX2D,
                                            gfx::TextureUsageBit::COLOR_ATTACHMENT | gfx::TextureUsageBit::SAMPLED | gfx::TextureUsageBit::TRANSFER_SRC,
                                            colorAttachment.format,
                                            _width,
                                            _height};
            if (info.externalFlag.has_value()) {
                if (hasFlag(info.externalFlag.value(), gfx::TextureFlagBit::EXTERNAL_NORMAL)) {
                    textureInfo.flags |= info.externalFlag.value();
                    if (info.externalResLow.has_value() && info.externalResHigh.has_value()) {
                        uint64_t externalResAddr = (static_cast<uint64_t>(info.externalResHigh.value()) << 32) | info.externalResLow.value();
                        textureInfo.externalRes = reinterpret_cast<void *>(externalResAddr);
                    } else if (info.externalResLow.has_value()) {
                        textureInfo.externalRes = reinterpret_cast<void *>(static_cast<uint64_t>(info.externalResLow.value()));
                    }
                }
            }

            _colorTextures.pushBack(device->createTexture(textureInfo));
        }
        if (info.renderPassInfo.depthStencilAttachment.format != gfx::Format::UNKNOWN) {
            _depthStencilTexture = device->createTexture({gfx::TextureType::TEX2D,
                                                          gfx::TextureUsageBit::DEPTH_STENCIL_ATTACHMENT | gfx::TextureUsageBit::SAMPLED,
                                                          info.renderPassInfo.depthStencilAttachment.format,
                                                          _width,
                                                          _height});
        }
    }

    generateFrameBuffer();
    return true;
}

void RenderWindow::destroy() {
    clearCameras();

    // Gfx objects invoke destroy in VK\GL\MTL Object destructor.
    _frameBuffer = nullptr;
    _renderPass = nullptr;
    _depthStencilTexture = nullptr;

    // RefVector invokes RefCounted::release() when removing an element.
    _colorTextures.clear();
}

void RenderWindow::resize(uint32_t width, uint32_t height) {
    if (_swapchain != nullptr) {
        _swapchain->resize(width, height, ORIENTATION_MAP.at(Device::getDeviceOrientation()));
        _width = _swapchain->getWidth();
        _height = _swapchain->getHeight();
    } else {
        for (auto *colorTexture : _colorTextures) {
            colorTexture->resize(width, height);
        }
        if (_depthStencilTexture != nullptr) {
            _depthStencilTexture->resize(width, height);
        }
        _width = width;
        _height = height;
    }

    generateFrameBuffer();

    for (Camera *camera : _cameras) {
        camera->resize(width, height);
    }
}

void RenderWindow::extractRenderCameras(ccstd::vector<Camera *> &cameras) {
    for (Camera *camera : _cameras) {
        if (camera->isEnabled()) {
            camera->update();
            cameras.emplace_back(camera);
        }
    }
}

void RenderWindow::onNativeWindowDestroy(uint32_t windowId) {
    if (_swapchain != nullptr && _swapchain->getWindowId() == windowId) {
        _swapchain->destroySurface();
    }
}

void RenderWindow::onNativeWindowResume(uint32_t windowId) {
    if (_swapchain == nullptr || _swapchain->getWindowId() != windowId) {
        return;
    }
    auto *windowMgr = BasePlatform::getPlatform()->getInterface<ISystemWindowManager>();
    auto *hWnd = reinterpret_cast<void *>(windowMgr->getWindow(windowId)->getWindowHandle());
    _swapchain->createSurface(hWnd);
    generateFrameBuffer();
}

void RenderWindow::generateFrameBuffer() {
    _frameBuffer = gfx::Device::getInstance()->createFramebuffer(gfx::FramebufferInfo{
        _renderPass,
        _colorTextures.get(),
        _depthStencilTexture});
}

void RenderWindow::attachCamera(Camera *camera) {
    for (Camera *cam : _cameras) {
        if (cam == camera) return;
    }
    _cameras.emplace_back(camera);
    sortCameras();
}

void RenderWindow::detachCamera(Camera *camera) {
    for (auto it = _cameras.begin(); it != _cameras.end(); ++it) {
        if (*it == camera) {
            _cameras.erase(it);
            return;
        }
    }
}

void RenderWindow::clearCameras() {
    _cameras.clear();
}

void RenderWindow::sortCameras() {
    std::stable_sort(_cameras.begin(), _cameras.end(), [](Camera *a, Camera *b) { return a->getPriority() < b->getPriority(); });
}

} // namespace scene

} // namespace cc