WSimulationCanvas.cpp

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#include "WSimulationCanvas.h"
#include "ImageEncoder.h"
 
#include <Wt/WApplication.h>
#include <Wt/WMemoryResource.h>
#include <Wt/WImage.h>
 
#include <GLFW/glfw3.h>
 
#include <SceneGraph.h>
#include <GLRenderEngine.h>
#include <OrbitCamera.h>
#include <TrackballCamera.h>
 
#include "imgui_impl_wt.h"
 
using namespace dyno;
 
std::map<Wt::Key, PKeyboardType> WKeyMap =
{
    {Wt::Key::Unknown, PKEY_UNKNOWN},
    {Wt::Key::Space, PKEY_SPACE},
    {Wt::Key::Key_0, PKEY_0},
    {Wt::Key::Key_1, PKEY_1},
    {Wt::Key::Key_2, PKEY_2},
    {Wt::Key::Key_3, PKEY_3},
    {Wt::Key::Key_4, PKEY_4},
    {Wt::Key::Key_5, PKEY_5},
    {Wt::Key::Key_6, PKEY_6},
    {Wt::Key::Key_7, PKEY_7},
    {Wt::Key::Key_8, PKEY_8},
    {Wt::Key::Key_9, PKEY_9},
    {Wt::Key::A, PKEY_A},
    {Wt::Key::B, PKEY_B},
    {Wt::Key::C, PKEY_C},
    {Wt::Key::D, PKEY_D},
    {Wt::Key::E, PKEY_E},
    {Wt::Key::F, PKEY_F},
    {Wt::Key::G, PKEY_G},
    {Wt::Key::H, PKEY_H},
    {Wt::Key::I, PKEY_I},
    {Wt::Key::J, PKEY_J},
    {Wt::Key::K, PKEY_K},
    {Wt::Key::L, PKEY_L},
    {Wt::Key::M, PKEY_M},
    {Wt::Key::N, PKEY_N},
    {Wt::Key::O, PKEY_O},
    {Wt::Key::P, PKEY_P},
    {Wt::Key::Q, PKEY_Q},
    {Wt::Key::R, PKEY_R},
    {Wt::Key::S, PKEY_S},
    {Wt::Key::T, PKEY_T},
    {Wt::Key::U, PKEY_U},
    {Wt::Key::V, PKEY_V},
    {Wt::Key::W, PKEY_W},
    {Wt::Key::X, PKEY_X},
    {Wt::Key::Y, PKEY_Y},
    {Wt::Key::Z, PKEY_Z},
    {Wt::Key::Escape, PKEY_ESCAPE},
    {Wt::Key::Enter, PKEY_ENTER},
    {Wt::Key::Tab, PKEY_TAB},
    {Wt::Key::Backspace, PKEY_BACKSPACE},
    {Wt::Key::Insert, PKEY_INSERT},
    {Wt::Key::Delete, PKEY_DELETE},
    {Wt::Key::Right, PKEY_RIGHT},
    {Wt::Key::Left, PKEY_LEFT},
    {Wt::Key::Down, PKEY_DOWN},
    {Wt::Key::Up, PKEY_UP},
    {Wt::Key::PageUp, PKEY_PAGE_UP},
    {Wt::Key::PageDown, PKEY_PAGE_DOWN},
    {Wt::Key::Home, PKEY_HOME},
    {Wt::Key::End, PKEY_END},
    {Wt::Key::F1, PKEY_F1},
    {Wt::Key::F2, PKEY_F2},
    {Wt::Key::F3, PKEY_F3},
    {Wt::Key::F4, PKEY_F4},
    {Wt::Key::F5, PKEY_F5},
    {Wt::Key::F6, PKEY_F6},
    {Wt::Key::F7, PKEY_F7},
    {Wt::Key::F8, PKEY_F8},
    {Wt::Key::F9, PKEY_F9},
    {Wt::Key::F10, PKEY_F10},
    {Wt::Key::F11, PKEY_F11},
    {Wt::Key::F12, PKEY_F12}
};
 
PModifierBits mappingWtModifierBits(Wt::KeyboardModifier mods)
{
    if (mods == Wt::KeyboardModifier::Control)
    {
        return PModifierBits::MB_CONTROL;
    }
    else if (mods == Wt::KeyboardModifier::Shift)
    {
        return PModifierBits::MB_SHIFT;
    }
    else if (mods == Wt::KeyboardModifier::Alt)
    {
        return PModifierBits::MB_ALT;
    }
    else
        return PModifierBits::MB_NO_MODIFIER;
}
 
WSimulationCanvas::WSimulationCanvas()
{
    this->setLayoutSizeAware(true);
    this->setStyleClass("remote-framebuffer");
    this->resize("100%", "100%");
 
    this->mouseWentUp().preventDefaultAction(true);
    this->mouseWentDown().preventDefaultAction(true);
    this->mouseDragged().preventDefaultAction(true);
    this->touchStarted().preventDefaultAction(true);
    this->touchMoved().preventDefaultAction(true);
    this->touchEnded().preventDefaultAction(true);
 
    this->mouseWentDown().connect(this, &WSimulationCanvas::onMousePressed);
    this->mouseWheel().connect(this, &WSimulationCanvas::onMouseWheeled);
    this->mouseDragged().connect(this, &WSimulationCanvas::onMouseDrag);
    this->mouseWentUp().connect(this, &WSimulationCanvas::onMouseReleased);
 
    //  this->keyWentDown().connect(this, &WSimulationCanvas::onKeyWentDown);
    //  this->keyWentUp().connect(this, &WSimulationCanvas::onKeyWentUp);
 
    this->setAttributeValue("oncontextmenu", "return false;");
 
    mApp = Wt::WApplication::instance();
 
    mImage = this->addNew<Wt::WImage>();
    mImage->resize("100%", "100%");
 
    mImage->setJavaScriptMember("currURL", "null");
    mImage->setJavaScriptMember("nextURL", "null");
    mImage->setJavaScriptMember("onload",
        "function() {"
        "this.currURL = this.nextURL;"
        "this.nextURL = null;"
        "if (this.currURL != null) {"
        "this.src = this.currURL;"
        "}"
        "}.bind(" + mImage->jsRef() + ")");
    mImage->setJavaScriptMember("onerror",
        "function() {"
        "this.currURL = this.nextURL;"
        "this.nextURL = null;"
        "if (this.currURL != null) {"
        "this.src = this.currURL;"
        "}"
        "}.bind(" + mImage->jsRef() + ")");
    mImage->setJavaScriptMember("update",
        "function(url) { "
        "if (this.currURL == null) {"
        "this.currURL = url;"
        "this.src = this.currURL;"
        "} else {"                      // still loading
        "this.nextURL = url;"
        "}"
        "}.bind(" + mImage->jsRef() + ")");
 
    mImageData.resize(width * height * 3); // initialize image buffer
    mJpegEncoder = std::make_unique<ImageEncoderNV>();
    mJpegEncoder->SetQuality(100);
    mJpegResource = std::make_unique<Wt::WMemoryResource>("image/jpeg");
 
    mRenderEngine = std::make_shared<dyno::GLRenderEngine>();
 
    this->setWindowSize(width, height);
 
    // initialize OpenGL context and RenderEngine
    this->initializeGL();
 
    //this->toggleImGUI();
}
 
WSimulationCanvas::~WSimulationCanvas()
{
    makeCurrent();
 
    delete mImGuiCtx;
 
    mRenderEngine->terminate();
 
    mFramebuffer.release();
    mFrameColor.release();
 
    mImageData.resize(0);
    mJpegBuffer.resize(0);
 
    glfwDestroyWindow(mContext);
    //glfwTerminate();
    Wt::log("warning") << "WSimulationCanvas destory";
}
 
void WSimulationCanvas::initializeGL()
{
    // initialize render engine and target
    glfwInit();
    // Set all the required options for GLFW
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
 
    mContext = glfwCreateWindow(width, height, "", NULL, NULL);
    if (!mContext)
    {
        Wt::log("error") << "Failed to create OpenGL context!";
        exit(-1);
    }
 
    makeCurrent();
 
    mRenderEngine->initialize();
 
    if (showImGUI())
    {
        mImGuiCtx = new ImGuiBackendWt(this);
        // Setup Dear ImGui context
        ImGui::StyleColorsDark();
 
        // Get Context scale
        float xscale, yscale;
        glfwGetMonitorContentScale(glfwGetPrimaryMonitor(), &xscale, &yscale);
 
        // Initialize ImWindow
        mImWindow.initialize(xscale);
        mImWindow.setEnableViewManipulate(false);
    }
 
    // create framebuffer here...
    mFrameColor.format = GL_RGB;
    mFrameColor.internalFormat = GL_RGB;
    mFrameColor.type = GL_BYTE;
    mFrameColor.create();
    mFrameColor.resize(width, height);
 
    mFramebuffer.create();
    mFramebuffer.bind();
    const unsigned int GL_COLOR_ATTACHMENT0 = 0x8CE0;
    mFramebuffer.setTexture(GL_COLOR_ATTACHMENT0, &mFrameColor); //
    unsigned int buffers[]{ GL_COLOR_ATTACHMENT0 };
    mFramebuffer.drawBuffers(1, buffers);
    mFramebuffer.unbind();
 
    doneCurrent();
}
 
void WSimulationCanvas::makeCurrent()
{
    if (glfwGetCurrentContext() != mContext)
        glfwMakeContextCurrent(mContext);
}
 
void WSimulationCanvas::doneCurrent()
{
    glfwMakeContextCurrent(NULL);
}
 
void WSimulationCanvas::layoutSizeChanged(int width, int height)
{
    mCamera->setWidth(width);
    mCamera->setHeight(height);
    mImageData.resize(width * height * 3);
 
    this->makeCurrent();
    // resize framebuffer
    mFrameColor.resize(width, height);
    this->doneCurrent();
 
    WContainerWidget::layoutSizeChanged(width, height);
    scheduleRender();
}
 
void WSimulationCanvas::onMousePressed(const Wt::WMouseEvent& evt)
{
    if (!mImGuiCtx->handleMousePressed(evt))
    {
        mMouseButtonDown = true;
 
        if (evt.button() == Wt::MouseButton::Right)
        {
            mtempCursorX = evt.widget().x;
        }
 
        Wt::Coordinates coord = evt.widget();
        mCamera->registerPoint(coord.x, coord.y);
    }
    scheduleRender();
}
 
void WSimulationCanvas::onMouseDrag(const Wt::WMouseEvent& evt)
{
    if (!mImGuiCtx->handleMouseDrag(evt))
    {
        auto mods = evt.modifiers();
 
        if (mods.test(Wt::KeyboardModifier::Alt) && mMouseButtonDown == true)
        {
            Wt::Coordinates coord = evt.widget();
            if (evt.button() == Wt::MouseButton::Left) {
                mCamera->rotateToPoint(coord.x, coord.y);
            }
            else if (evt.button() == Wt::MouseButton::Middle) {
                mCamera->translateToPoint(coord.x, coord.y);
            }
            else if (evt.button() == Wt::MouseButton::Right) {
                auto cam = this->getCamera();
                cam->zoom(-0.005 * float(evt.widget().x - mtempCursorX));
                mtempCursorX = evt.widget().x;
            }
        }
    }
    scheduleRender();
}
 
void WSimulationCanvas::onMouseReleased(const Wt::WMouseEvent& evt)
{
    if (!mImGuiCtx->handleMouseReleased(evt))
    {
        mMouseButtonDown = false;
    }
 
    scheduleRender();
}
 
void WSimulationCanvas::onMouseWheeled(const Wt::WMouseEvent& evt)
{
    mCamera->zoom(-1.0 * evt.wheelDelta());
    scheduleRender();
}
 
void WSimulationCanvas::onKeyWentDown(const Wt::WKeyEvent& evt)
{
    Wt::log("Error") << "´¥·¢ÁË";
    PKeyboardEvent keyEvent;
    keyEvent.key = WKeyMap.find(evt.key()) == WKeyMap.end() ? PKEY_UNKNOWN : WKeyMap[evt.key()];
    keyEvent.action = AT_PRESS;
    keyEvent.mods = mappingWtModifierBits(evt.modifiers());
 
    mScene->onKeyboardEvent(keyEvent);
 
    switch (evt.key())
    {
    case Wt::Key::H:
        this->toggleImGUI();
        break;
    default:
        break;
    }
 
    scheduleRender();
}
 
void WSimulationCanvas::onKeyWentUp(const Wt::WKeyEvent& evt)
{
}
 
void WSimulationCanvas::render(Wt::WFlags<Wt::RenderFlag> flags)
{
    update();
}
 
void WSimulationCanvas::update()
{
    // do render
    {
        this->makeCurrent();
 
        if (mScene)
        {
            mScene->updateGraphicsContext();
        }
 
        // update rendering params
        mRenderParams.width = mCamera->viewportWidth();
        mRenderParams.height = mCamera->viewportHeight();
        mRenderParams.transforms.model = glm::mat4(1);  // TODO: world transform?
        mRenderParams.transforms.view = mCamera->getViewMat();
        mRenderParams.transforms.proj = mCamera->getProjMat();
        mRenderParams.unitScale = mCamera->unitScale();
 
        mFramebuffer.bind();
        // heck: ImGUI widgets need to render twice...
        if (showImGUI())
        {
            // Start the Dear ImGui frame
            mImGuiCtx->NewFrame(mCamera->viewportWidth(), mCamera->viewportHeight());
            mImWindow.draw(this);
            mImGuiCtx->Render();
        }
 
        mRenderEngine->draw(mScene.get(), mRenderParams);
 
        if (showImGUI())
        {
            // Start the Dear ImGui frame
            mImGuiCtx->NewFrame(mCamera->viewportWidth(), mCamera->viewportHeight());
            mImWindow.draw(this);
            mImGuiCtx->Render();
        }
 
        // dump framebuffer
        mFrameColor.dump(mImageData.data());
        mFramebuffer.unbind();
 
        this->doneCurrent();
    }
 
    // encode image
    {
        mJpegBuffer.clear();
 
        mJpegEncoder->Encode(mImageData.data(),
            mCamera->viewportWidth(), mCamera->viewportHeight(), 0,
            mJpegBuffer);
 
        Wt::log("info") << mCamera->viewportWidth() << " x " << mCamera->viewportHeight()
            << ", JPG size: " << mJpegBuffer.size() / 1024 << " kb";
    }
 
    // update UI
    {
        mJpegResource->setData(std::move(mJpegBuffer));
        const std::string url = mJpegResource->generateUrl();
        mImage->callJavaScriptMember("update", WWebWidget::jsStringLiteral(url));
    }
}
 
void WSimulationCanvas::setScene(std::shared_ptr<dyno::SceneGraph> scene)
{
    this->mScene = scene;
 
    // TODO: move to somewhere else!
    if (this->mScene)
    {
        makeCurrent();
        this->mScene->reset();
        doneCurrent();
 
        scheduleRender();
    }
}