GlfwRenderWindow.cpp

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#include "GlfwRenderWindow.h"
 
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <sstream>
 
#include "SceneGraph.h"
#include "Module/MouseInputModule.h"
#include "Log.h"
 
#include <RenderEngine.h>
#include <OrbitCamera.h>
#include <TrackballCamera.h>
 
#include <GLRenderEngine.h>
#include <SceneGraphFactory.h>
 
#include <glad/glad.h>
// Include glfw3.h after our OpenGL definitions
#include <GLFW/glfw3.h>
 
#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_opengl3.h"
 
#include "ImGuizmo.h"
 
#include <ImWidget.h>
 
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <stb/stb_image_write.h>
 
namespace dyno 
{
    static void RecieveLogMessage(const Log::Message& m)
    {
        switch (m.type)
        {
        case Log::Info:
            std::cout << ">>>: " << m.text << std::endl; break;
        case Log::Warning:
            std::cout << "???: " << m.text << std::endl; break;
        case Log::Error:
            std::cout << "!!!: " << m.text << std::endl; break;
        case Log::User:
            std::cout << ">>>: " << m.text << std::endl; break;
        default: break;
        }
    }
 
    static void glfw_error_callback(int error, const char* description)
    {
        fprintf(stderr, "Glfw Error %d: %s\n", error, description);
    }
 
    GlfwRenderWindow::GlfwRenderWindow(int argc /*= 0*/, char **argv /*= NULL*/)
        : RenderWindow()
    {
        Log::setUserReceiver(&RecieveLogMessage);
 
        // create render engine
        mRenderEngine = std::make_shared<GLRenderEngine>();
    }
 
    GlfwRenderWindow::~GlfwRenderWindow()
    {
        // Cleanup
        ImGui_ImplOpenGL3_Shutdown();
        ImGui_ImplGlfw_Shutdown();
        ImGui::DestroyContext();
 
        glfwDestroyWindow(mWindow);
        glfwTerminate();
    }
 
    void GlfwRenderWindow::initialize(int width, int height)
    {
        mWindowTitle = std::string("PeriDyno ") + std::to_string(PERIDYNO_VERSION_MAJOR) + std::string(".") + std::to_string(PERIDYNO_VERSION_MINOR) + std::string(".") + std::to_string(PERIDYNO_VERSION_PATCH);
 
        // Setup window
        glfwSetErrorCallback(glfw_error_callback);
        if (!glfwInit())
            return;
 
        // Decide GL+GLSL versions
#if defined(IMGUI_IMPL_OPENGL_ES2)
    // GL ES 2.0 + GLSL 100
        const char* glsl_version = "#version 100";
        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
        glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
#elif defined(__APPLE__)
    // GL 3.2 + GLSL 150
        const char* glsl_version = "#version 150";
        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
        glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
        glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // Required on Mac
#else
    // GL 3.0 + GLSL 130
        const char* glsl_version = "#version 130";
        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
        //glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
        //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // 3.0+ only
#endif
        // enable multisamples for anti alias
        glfwWindowHint(GLFW_SAMPLES, 4);
 
        // Create window with graphics context
        mWindow = glfwCreateWindow(width, height, mWindowTitle.c_str(), NULL, NULL);
        if (mWindow == NULL)
            return;
 
        initCallbacks();
        
        glfwMakeContextCurrent(mWindow);
        
        if (!gladLoadGL()) {
            Log::sendMessage(Log::Error, "Failed to load GLAD!");
            //SPDLOG_CRITICAL("Failed to load GLAD!");
            exit(-1);
        }
 
        glfwSwapInterval(1); // Enable vsync
 
        glfwSetWindowUserPointer(mWindow, this);
 
        // Initialize OpenGL loader
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
        bool err = gl3wInit() != 0;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
        bool err = glewInit() != GLEW_OK;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
        bool err = gladLoadGL() == 0;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
        bool err = gladLoadGL(glfwGetProcAddress) == 0; // glad2 recommend using the windowing library loader instead of the (optionally) bundled one.
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
        bool err = false;
        glbinding::Binding::initialize();
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
        bool err = false;
        glbinding::initialize([](const char* name) { return (glbinding::ProcAddress)glfwGetProcAddress(name); });
#else
        bool err = false; // If you use IMGUI_IMPL_OPENGL_LOADER_CUSTOM, your loader is likely to requires some form of initialization.
#endif
        if (err)
        {
            fprintf(stderr, "Failed to initialize OpenGL loader!\n");
            return;
        }
 
        // Setup Dear ImGui context
        IMGUI_CHECKVERSION();
        ImGui::CreateContext();
        ImGuiIO& io = ImGui::GetIO(); (void)io;
        //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
        //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
 
        // Setup Dear ImGui style
        ImGui::StyleColorsDark();
        //ImGui::StyleColorsClassic();
        // initializeStyle();
 
        // Setup Platform/Renderer backends
        ImGui_ImplGlfw_InitForOpenGL(mWindow, true);
        ImGui_ImplOpenGL3_Init(glsl_version);
 
        // Get Context scale
        float xscale, yscale;
        glfwGetMonitorContentScale(glfwGetPrimaryMonitor(), &xscale, &yscale);
 
        // initialize rendering engine
        mRenderEngine->initialize();
 
        // Jian: initialize ImWindow
        mImWindow.initialize(xscale);
 
        this->setWindowSize(width, height);
    }
 
    void GlfwRenderWindow::initializeStyle()
    {
        ImGuiStyle& style = ImGui::GetStyle();
        style.WindowRounding = 6.0f;
        style.ChildRounding = 6.0f;
        style.FrameRounding = 6.0f;
        style.PopupRounding = 6.0f;
    }
    
    void GlfwRenderWindow::mainLoop()
    {
        auto activeScene = SceneGraphFactory::instance()->active();
 
        activeScene->reset();
 
        // Main loop
        while (!glfwWindowShouldClose(mWindow))
        {
            glfwPollEvents();
 
            if (mAnimationToggle){
 
                if (this->isScreenRecordingOn())
                {
                    saveScreen(activeScene->getFrameNumber());
                }
 
                activeScene->takeOneFrame();
            }
            
            activeScene->updateGraphicsContext();
 
            // update rendering params
            mRenderParams.width = mCamera->viewportWidth();
            mRenderParams.height = mCamera->viewportHeight();
 
            // check if window is minimized
            if (mRenderParams.width == 0 || mRenderParams.height == 0)
                continue;
 
            mRenderParams.transforms.model = glm::mat4(1);  // TODO: world transform?
            mRenderParams.transforms.view = mCamera->getViewMat();
            mRenderParams.transforms.proj = mCamera->getProjMat();
            mRenderParams.unitScale = mCamera->unitScale();
 
            mRenderEngine->draw(activeScene.get(), mRenderParams);
 
            // Start the Dear ImGui frame
            ImGui_ImplOpenGL3_NewFrame();
            ImGui_ImplGlfw_NewFrame();
            ImGui::NewFrame();
 
            if(showImGUI())
                mImWindow.draw(this);
 
//          // Draw widgets
//          // TODO: maybe move into mImWindow...
//          for (auto widget : mWidgets)
//          {
//              widget->update();
//              widget->paint();
//          }
 
 
 
//          // draw a pick rect
//          if (mButtonType == GLFW_MOUSE_BUTTON_LEFT &&
//              mButtonAction == GLFW_PRESS &&
//              mButtonMode == 0 && 
//              !ImGuizmo::IsUsing() &&
//              !ImGui::GetIO().WantCaptureMouse) {
//              double xpos, ypos;
//              glfwGetCursorPos(mWindow, &xpos, &ypos);
// 
//              ImVec2 pMin = { fminf(xpos, mCursorPosX), fminf(ypos, mCursorPosY) };
//              ImVec2 pMax = { fmaxf(xpos, mCursorPosX), fmaxf(ypos, mCursorPosY) };           
// 
//              // visible rectangle
//              if (pMin.x != pMax.x || pMin.y != pMax.y) {
//                  // fill
//                  ImGui::GetBackgroundDrawList()->AddRectFilled(pMin, pMax, ImColor{ 0.2f, 0.2f, 0.2f, 0.5f });
//                  // border
//                  ImGui::GetBackgroundDrawList()->AddRect(pMin, pMax, ImColor{ 0.8f, 0.8f, 0.8f, 0.8f }, 0, 0, 1.5f);
//              }
//          }
 
            ImGui::Render();
            ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 
            glfwSwapBuffers(mWindow);
        }
 
        mRenderEngine->terminate();
    }
 
    const std::string& GlfwRenderWindow::name() const
    {
        return mWindowTitle;
    }
 
    void GlfwRenderWindow::setWindowTitle(const std::string& title)
    {
        glfwSetWindowTitle(mWindow, title.c_str());
    }
 
    void GlfwRenderWindow::setCursorPos(double x, double y)
    {
        mCursorPosX = x;
        mCursorPosY = y;
    }
 
    double GlfwRenderWindow::getCursorPosX()
    {
        return mCursorPosX;
    }
 
    double GlfwRenderWindow::getCursorPosY()
    {
        return mCursorPosY;
    }
 
    void GlfwRenderWindow::onSaveScreen(const std::string &filename)
    {
        int width;
        int height;
        glfwGetFramebufferSize(mWindow, &width, &height);
 
        unsigned char *data = new unsigned char[width * height * 3];  //RGB
        assert(data);
        glBindFramebuffer(GL_READ_FRAMEBUFFER, 0); 
        glPixelStorei(GL_PACK_ALIGNMENT, 1);
        glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, (void*)data);
 
        stbi_flip_vertically_on_write(true);
        int status = stbi_write_bmp(filename.c_str(), width, height, 3, data);
 
        delete data;
    }
 
    void GlfwRenderWindow::turnOnVSync()
    {
        glfwSwapInterval(1);
    }
 
    void GlfwRenderWindow::turnOffVSync()
    {
        glfwSwapInterval(0);
    }
 
    void GlfwRenderWindow::toggleAnimation()
    {
        mAnimationToggle = !mAnimationToggle;
    }
 
    int GlfwRenderWindow::getWidth()
    {
        return getCamera()->viewportWidth();
    }
 
    int GlfwRenderWindow::getHeight()
    {
        return getCamera()->viewportHeight();
    }
 
    void GlfwRenderWindow::initCallbacks()
    {
        mMouseButtonFunc = GlfwRenderWindow::mouseButtonCallback;
        mKeyboardFunc = GlfwRenderWindow::keyboardCallback;
        mReshapeFunc = GlfwRenderWindow::reshapeCallback;
        mCursorPosFunc = GlfwRenderWindow::cursorPosCallback;
        mCursorEnterFunc = GlfwRenderWindow::cursorEnterCallback;
        mScrollFunc = GlfwRenderWindow::scrollCallback;
 
        glfwSetMouseButtonCallback(mWindow, mMouseButtonFunc);
        glfwSetKeyCallback(mWindow, mKeyboardFunc);
        glfwSetFramebufferSizeCallback(mWindow, mReshapeFunc);
        glfwSetCursorPosCallback(mWindow, mCursorPosFunc);
        glfwSetCursorEnterCallback(mWindow, mCursorEnterFunc);
        glfwSetScrollCallback(mWindow, mScrollFunc);
 
    }
 
    void GlfwRenderWindow::drawScene(void)
    {
        
    }
 
    void GlfwRenderWindow::mouseButtonCallback(GLFWwindow* window, int button, int action, int mods)
    {
        double xpos, ypos;
        glfwGetCursorPos(window, &xpos, &ypos);
 
        GlfwRenderWindow* activeWindow = (GlfwRenderWindow*)glfwGetWindowUserPointer(window);
 
        // Object selection
        if (activeWindow->getSelectionMode() == RenderWindow::OBJECT_MODE)
        {
            // handle picking
            if (activeWindow->getButtonType() == GLFW_MOUSE_BUTTON_LEFT &&
                activeWindow->getButtonAction() == GLFW_PRESS &&
                activeWindow->getButtonMode() == 0 &&
                action == GLFW_RELEASE) {
 
                // in picking
                int x = fmin(xpos, activeWindow->getCursorPosX());
                int y = fmax(ypos, activeWindow->getCursorPosY());
                int w = fabs(xpos - activeWindow->getCursorPosX());
                int h = fabs(ypos - activeWindow->getCursorPosY());
                // flip y to texture space...
                y = activeWindow->getHeight() - y - 1;
 
                const auto& selection = activeWindow->select(x, y, w, h);
            }
        }
 
        auto camera = activeWindow->getCamera();
 
        activeWindow->setButtonType(button);
        activeWindow->setButtonAction(action);
        activeWindow->setButtonMode(mods);
 
        // Primitive selection
        if (activeWindow->getSelectionMode() == RenderWindow::PRIMITIVE_MODE)
        {
            PMouseEvent mouseEvent;
            mouseEvent.ray = camera->castRayInWorldSpace((float)xpos, (float)ypos);
            mouseEvent.buttonType = (PButtonType)button;
            mouseEvent.actionType = (PActionType)action;
            mouseEvent.mods = (PModifierBits)activeWindow->getButtonMode();
            mouseEvent.camera = camera;
            mouseEvent.x = (float)xpos;
            mouseEvent.y = (float)ypos;
 
            auto activeScene = SceneGraphFactory::instance()->active();
 
            if (activeScene->getWorkMode() == SceneGraph::EDIT_MODE)
            {
                activeScene->onMouseEvent(mouseEvent, activeWindow->getCurrentSelectedNode());
            }
            else
                activeScene->onMouseEvent(mouseEvent);
            
 
            if (action == GLFW_PRESS)
            {
                activeWindow->imWindow()->mousePressEvent(mouseEvent);
            }
 
            if (action == GLFW_RELEASE)
            {
                activeWindow->imWindow()->mouseReleaseEvent(mouseEvent);
            }
        }
 
        if (action == GLFW_PRESS)
        {
            // if(mOpenCameraRotate)
            camera->registerPoint((float)xpos, (float)ypos);
            activeWindow->setButtonState(GLFW_DOWN);
        }
        else
            glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
 
        if (action == GLFW_RELEASE)
        {
            activeWindow->setButtonState(GLFW_UP);
        }
 
        // update cursor position record
        
        if (action == GLFW_PRESS) 
        {
            activeWindow->setCursorPos(xpos, ypos);
            activeWindow->mCursorTempX = xpos;
        }
        else 
        {
            activeWindow->setCursorPos(-1, -1);
            activeWindow->mCursorTempX = -1;
        }
 
    }
 
    void GlfwRenderWindow::cursorPosCallback(GLFWwindow* window, double x, double y)
    {
        GlfwRenderWindow* activeWindow = (GlfwRenderWindow*)glfwGetWindowUserPointer(window); // User Pointer
        auto camera = activeWindow->getCamera();
 
        PMouseEvent mouseEvent;
        mouseEvent.ray = camera->castRayInWorldSpace((float)x, (float)y);
        mouseEvent.buttonType = (PButtonType)activeWindow->getButtonType();
        mouseEvent.actionType = PActionType::AT_REPEAT;
        mouseEvent.mods = (PModifierBits)activeWindow->getButtonMode();
        mouseEvent.camera = camera;
        mouseEvent.x = (float)x;
        mouseEvent.y = (float)y;
 
        auto activeScene = SceneGraphFactory::instance()->active();
        activeScene->onMouseEvent(mouseEvent);
 
        if (activeWindow->getButtonType() == GLFW_MOUSE_BUTTON_LEFT &&
            activeWindow->getButtonState() == GLFW_DOWN &&
            activeWindow->getButtonMode() == GLFW_MOD_ALT &&
            !activeWindow->mImWindow.cameraLocked()) 
        {
            camera->rotateToPoint(x, y);
        }
        else if (
            activeWindow->getButtonType() == GLFW_MOUSE_BUTTON_MIDDLE &&
            activeWindow->getButtonState() == GLFW_DOWN && 
            activeWindow->getButtonMode() == GLFW_MOD_ALT &&
            !activeWindow->mImWindow.cameraLocked()) 
        {
            camera->translateToPoint(x, y);
        }
        else if (
            activeWindow->getButtonType() == GLFW_MOUSE_BUTTON_RIGHT &&
            activeWindow->getButtonState() == GLFW_DOWN &&
            activeWindow->getButtonMode() == GLFW_MOD_ALT &&
            !activeWindow->mImWindow.cameraLocked())
        {
            if (activeWindow->mCursorTempX != -1) 
            {
                camera->zoom(-0.005 * (x - activeWindow->mCursorTempX));
                activeWindow->mCursorTempX = x;
            }
        }
        activeWindow->imWindow()->mouseMoveEvent(mouseEvent); 
    }
 
    void GlfwRenderWindow::cursorEnterCallback(GLFWwindow* window, int entered)
    {
        if (entered)
        {
            // The cursor entered the content area of the window
        }
        else
        {
            // The cursor left the content area of the window
        }
    }
 
    void GlfwRenderWindow::scrollCallback(GLFWwindow* window, double offsetX, double OffsetY)
    {
        GlfwRenderWindow* activeWindow = (GlfwRenderWindow*)glfwGetWindowUserPointer(window);
        auto camera = activeWindow->getCamera();
 
        if (!activeWindow->mImWindow.cameraLocked())
        {
            int state = glfwGetKey(window, GLFW_KEY_LEFT_CONTROL);
            int altState = glfwGetKey(window, GLFW_KEY_LEFT_ALT);
            //If the left control key is pressed, slow the zoom speed. 
            if (state == GLFW_PRESS && altState == GLFW_PRESS)
                camera->zoom(-0.1*OffsetY);
            else if (altState == GLFW_PRESS)
                camera->zoom(-OffsetY);
        }
    }
 
    void GlfwRenderWindow::keyboardCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
    {
        GlfwRenderWindow* activeWindow = (GlfwRenderWindow*)glfwGetWindowUserPointer(window);
 
        PKeyboardEvent keyEvent;
        keyEvent.key = (PKeyboardType)key;
        keyEvent.action = (PActionType)action;
        keyEvent.mods = (PModifierBits)mods;
 
        auto activeScene = SceneGraphFactory::instance()->active();
        activeScene->onKeyboardEvent(keyEvent);
 
        if (action != GLFW_PRESS)
            return;
 
        switch (key)
        {
        case GLFW_KEY_ESCAPE:
            glfwSetWindowShouldClose(window, GLFW_TRUE);
            break;
        case GLFW_KEY_SPACE:
            activeWindow->toggleAnimation();
            break;
        case GLFW_KEY_LEFT:
            break;
        case GLFW_KEY_RIGHT:
            break;
        case GLFW_KEY_UP:
            break;
        case GLFW_KEY_DOWN:
            break;
        case GLFW_KEY_PAGE_UP:
            break;
        case GLFW_KEY_PAGE_DOWN:
            break;
        case GLFW_KEY_N:
            activeScene->takeOneFrame();
            activeScene->updateGraphicsContext();
            break;
        case GLFW_KEY_F1:
            activeWindow->toggleImGUI();
            break;
        default:
            break;
        }
    }
 
    void GlfwRenderWindow::reshapeCallback(GLFWwindow* window, int w, int h)
    {
        GlfwRenderWindow* app = (GlfwRenderWindow*)glfwGetWindowUserPointer(window);
        app->setWindowSize(w, h);
    }
 
}