OpenGL 创建一个CEGUI窗口

来源:互联网 发布:淘宝电商平台技术架构 编辑:程序博客网 时间:2024/03/29 01:52
这里只给出代码,关于原理,参看CEGUI官网上的教程。本片对应CEGUI官网教程:
  • The Beginner Guide to Getting CEGUI Rendering - How to initialise CEGUI to render properly.
  • The Beginner Guide to Resource Groups - How to define resource group locations and specify default resource groups.
  • The Beginner Guide to Loading Data Files and Initialisation - How to load some data files and perform basic system initialisation.
  • The Beginner Guide to Creating a CEGUI Window - How to create a simple window and get it on screen.

glut_loop.cpp

#include <GL/glew.h>
#include <GL/freeglut.h>
#include <CEGUI.h>
#include <CEGUIDefaultResourceProvider.h>
#include <XMLParserModules/XercesParser/CEGUIXercesParser.h>
#include <RendererModules/OpenGLGUIRenderer/openglrenderer.h>

#define DATA_FILES "/home/XXX/program/cegui/datafiles/"

void render(void);
void keyFunc(unsigned char , int , int );
int resource_group(void);
int load_data_files(void);
int create_window(void);

int window_id;
bool keep_running = true;

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutInitWindowSize(640, 480);
    
    window_id = glutCreateWindow("GLUT Loop");
    glutSetCursor(GLUT_CURSOR_NONE); //隐藏原有光标

    GLenum err = glewInit();
    CEGUI::OpenGLRenderer* myRenderer = new CEGUI::OpenGLRenderer(0);
    new CEGUI::System(myRenderer);
    
    resource_group();
    load_data_files();
    create_window();

    while (keep_running)
    {
        glutMainLoopEvent();
        render();
        CEGUI::System::getSingleton().renderGUI();
        glutSwapBuffers();
    }

    glutDestroyWindow(window_id);
    return 0;
}

void render(void)
{
    glLoadIdentity();
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

void keyFunc(unsigned char key, int x, int y)
{
    switch (key)
    {
        case 113:
        case 81:
        case 27:
            keep_running = false;
            break;
    }
}

int resource_group(void)
{
    CEGUI::DefaultResourceProvider *rp = static_cast<CEGUI::DefaultResourceProvider*>
        (CEGUI::System::getSingleton().getResourceProvider());

    rp->setResourceGroupDirectory("schemes", DATA_FILES "schemes/");
    rp->setResourceGroupDirectory("imagesets", DATA_FILES "imagesets/");
    rp->setResourceGroupDirectory("fonts", DATA_FILES "fonts/");
    rp->setResourceGroupDirectory("layouts", DATA_FILES "layouts/");
    rp->setResourceGroupDirectory("looknfeels", DATA_FILES "looknfeel/");

    rp->setResourceGroupDirectory("schemas", DATA_FILES "XMLRefSchema/");    

    CEGUI::Imageset::setDefaultResourceGroup("imagesets");
    CEGUI::Font::setDefaultResourceGroup("fonts");
    CEGUI::Scheme::setDefaultResourceGroup("schemes");
    CEGUI::WidgetLookManager::setDefaultResourceGroup("looknfeels");
    CEGUI::WindowManager::setDefaultResourceGroup("layouts");
    CEGUI::XercesParser::setSchemaDefaultResourceGroup("schemas");
}

int load_data_files(void)
{
    CEGUI::SchemeManager::getSingleton().loadScheme("TaharezLook.scheme");
    if (!CEGUI::FontManager::getSingleton().isFontPresent("Commonwealth-10"))
        CEGUI::FontManager::getSingleton().createFont("Commonwealth-10");

    CEGUI::System::getSingleton().setDefaultFont("Commonwealth-10");
    CEGUI::System::getSingleton().setDefaultMouseCursor("TaharezLook", "MouseArrow");
    CEGUI::System::getSingleton().setDefaultTooltip("TaharezLook/Tooltip");
}

int create_window(void)
{
    using namespace CEGUI;

    WindowManager &wmgr = WindowManager::getSingleton();

    Window* myRoot = wmgr.createWindow("DefaultWindow", "root");
    System::getSingleton().setGUISheet(myRoot);

    FrameWindow *fWnd = (FrameWindow*)wmgr.createWindow("TaharezLook/FrameWindow", "testWindow");
    myRoot->addChildWindow(fWnd);

    fWnd->setPosition( UVector2( UDim(0.25f, 0), UDim(0.25f, 0) ) );
    fWnd->setSize( UVector2( UDim(0.5f, 0), UDim(0.5f, 0) ) );
    fWnd->setText("/nHello, world!/nI'm sihan.");
}


Makefile:

# Makefile to compile glut_loop
glut_loop: glut_loop.o
g++ glut_loop.o -lglut -L/usr/local/lib/ -lCEGUIBase -lCEGUIOpenGLRenderer -lCEGUIXercesParser -o glut_loop
#
glut_loop.o: glut_loop.cpp
g++ -c glut_loop.cpp -I/usr/local/include/CEGUI
#
.PHONY: clean
clean:
rm -rf *.o glut_loop
这是,创建出来的窗口还不能相应事件,接下来就开始添加事件处理函数。