glgamewidget.cpp

#include "glgamewidget.h"
#include "defines.h"
#include <QKeyEvent>
#define ___DONT_USE_OPENGL_ES2_

GLGameWidget* GLGameWidget::UniqueGLWidget = nullptr;
GLGameWidget::GLGameWidget(QWidget *parent):QGLWidget(parent){
    setFormat(QGLFormat(QGL::DoubleBuffer ));
    connect(this,&GLGameWidget::destroyed ,[=](){UniqueGLWidget = nullptr;});
}

GLGameWidget* GLGameWidget::MakeUniqueGLWidget (QWidget *parent ){
    if(UniqueGLWidget == nullptr){
        return UniqueGLWidget = new GLGameWidget(parent);
    }else return nullptr;
}


void GLGameWidget::initializeGL(){
#ifdef ___DONT_USE_OPENGL_ES2_
    glShadeModel(GL_FLAT);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_BLEND);
    glEnable(GL_CULL_FACE);
    glEnable(GL_TEXTURE_2D);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    qglClearColor(Qt::black);
    glOrtho(0.0, w, 0.0, h , -1.0, 1.0);
#endif
}

void GLGameWidget::resizeGL(int width,int height){
#ifdef ___DONT_USE_OPENGL_ES2_
    glViewport(0, 0, width, height);
    glLoadIdentity();
    glOrtho(0.0, w, 0.0, h, -1.0, 1.0);
#endif
}
void GLGameWidget::refresh (){
    qglClearColor(Qt::black);
    glClear(GL_COLOR_BUFFER_BIT);
}


void GLGameWidget::drawRect(int x ,int y,int w,int h,QColor color){
#ifdef ___DONT_USE_OPENGL_ES2_
    qglColor(color);
    glBegin(GL_QUADS);
    glVertex2d(x,y);
    glVertex2d(x+w,y);
    glVertex2d(x+w,y+h);
    glVertex2d(x,y+h);
    glEnd();
#endif
}

// 0   : Miss, > 1 : Succ
int GLGameWidget::loadImage(QString path){
    QImage image(path);
    if(image.isNull())return 0;
    unsigned int uihandle = bindTexture(image);
    imageSizeHash[uihandle] = QSize(image.width(),image.height());
    return (int)(uihandle);
}

void GLGameWidget::drawImage(int x,int y,int handle){
#ifdef ___DONT_USE_OPENGL_ES2_
    unsigned int uihandle = (unsigned int)(handle);
    if(!imageSizeHash.contains(uihandle)) return;
    QSize size = imageSizeHash[uihandle];
    glBindTexture(GL_TEXTURE_2D, uihandle);
    glBegin(GL_QUADS);
        glTexCoord2f(0,0); glVertex2d(x,y);
        glTexCoord2f(1,0); glVertex2d(x+size.width(),y);
        glTexCoord2f(1,1); glVertex2d(x+size.width(),y+size.height());
        glTexCoord2f(0,1); glVertex2d(x,y+size.height());
    glEnd();
#endif
}

bool GLGameWidget::getKeyDown(int keyCode){
    if(!keyPushHash.contains(keyCode))return false;
    else return keyPushHash[keyCode];
}

void GLGameWidget::keyPressEvent( QKeyEvent *event ){
    keyPushHash[event->key()] = true;
}

void GLGameWidget::keyReleaseEvent(QKeyEvent *event){
    keyPushHash[event->key()] = false;
}


//3D memo
//construct : | QGL::DepthBuffer));
//init      : glEnable(GL_DEPTH_TEST);
//resize    : glMatrixMode(GL_PROJECTION);  auto x = GLfloat(width) / height;  glFrustum(-x,x,-1.0,1.0,4.0,15.0);  glMatrixMode(GL_MODELVIEW); //2Dなのでプロジェクションする意味はない
//draw      : glCLear(~ | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW);   glLoadIdentity();  glTranslatef(0.0,0.0,-10.0);