4. SOLVED texture trouble in openGL

SOLVED texture trouble in openGL


  • SOLVED! Was a dumbass transposition of numbers!

    Pro file:

    #-------------------------------------------------
#
# Project created by QtCreator 2016-06-19T10:09:09
#
#-------------------------------------------------

QT  += core gui opengl

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = AnotherTest
TEMPLATE = app

SOURCES += main.cpp\
        mainwindow.cpp \
    globalfunctions.cpp \
    glwidget.cpp

HEADERS  += mainwindow.h \
    globals.h \
    glwidget.h

RESOURCES += \
    resourcefile.qrc

    Globals.h:

    #ifndef GLOBALS_H
#define GLOBALS_H

#include <iostream>
#include <cstdio>
#include <cmath>
#include <stdlib.h>
#include <vector>

#include <QApplication>
#include <QDebug>
#include <QDesktopWidget>

#include <QLayout>
#include <QMainWindow>
#include <QMatrix4x4>
#include <QMouseEvent>

#include <QOpenGLBuffer>
#include <QOpenGLContext>
#include <QOpenGLContextGroup>
#include <QOpenGLDebugLogger>
#include <QOpenGLDebugMessage>
#include <QOpenGLFramebufferObject>
#include <QOpenGLFramebufferObjectFormat>
#include <QOpenGLFunctions>
#include <QOpenGLFunctionsPrivate>
#include <QOpenGLFunctions_4_5_Compatibility>
#include <QOpenGLFunctions_ES2>
#include <QOpenGLPaintDevice>
#include <QOpenGLShader>
#include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
#include <QOpenGLTimeMonitor>
#include <QOpenGLTimerQuery>
#include <QOpenGLVersionFunctions>
#include <QOpenGLVersionProfile>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLWidget>
#include <QOpenGLWindow>

#include <QPushButton>

#include <QVector>
#include <QVector2D>
#include <QVector3D>
#include <QVector4D>

#include <QWheelEvent>
#include <QWidget>
#include <QWindow>

#include <QtCore>
#include <QtGlobal>

#include <QtGui>

using std::cout;
using std::cin;
using std::vector;

static const double G_PI = 3.14159265358979323846264338327;

static const double G_E = 2.718281828459045235360287471352;


//==================== struct gVertexDataStruct ====================

struct gVertexDataStruct
{
    QVector4D position;
    QVector4D pixColor;
    QVector2D texCoord;
};

//==================== functions ====================

void gSizeAndCenterWidget (QWidget* widget, int width, int height);

void gSizeAndCenterWidgetInWidget (QWidget* widget, QWidget* inWidget,
                                                            int sideMargin, int topBotMargin);

#endif // GLOBALS_H

    GLWidget.h:

    #ifndef GLWIDGET_H
#define GLWIDGET_H


#ifndef GLOBALS_H
#include "globals.h"
#endif

static const int VERTEX_ATTRIBUTE   = 0;
static const int TEXCOORD_ATTRIBUTE = 1;

//----------

class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
    Q_OBJECT

public:
    explicit GLWidget(QWidget *parent = 0);
    ~GLWidget();

    QSize minimumSizeHint();
    QSize sizeHint();

    void setClearColor(const QColor &color);

    QVector<gVertexDataStruct>  tStruct;

signals:
    void clicked();

protected:
    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();

    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void wheelEvent(QWheelEvent *event);

private:
    void makeObject();

    QColor clearColor;

    double  alpha;
    double  beta;
    double  distance;
    QPoint  lastMousePosition;

    QMatrix4x4  pMatrix;

    QOpenGLTexture*         texture;
    QOpenGLShaderProgram*   program;


    QVector<QVector3D>  trnVertexCoords;
    QVector<QVector4D>  trnColorCoords;
    QVector<QVector2D>  trnTextureCoords;

    QOpenGLBuffer vbo;
};
#endif // GLWIDGET_H

    MaindWindow.h:

    #ifndef MAINWINDOW_H
#define MAINWINDOW_H

#ifndef GLWIDGET_H
#include "glwidget.h"
#endif

#ifndef GLOBALS_H
#include "globals.h"
#endif

static const int MW_WIDTH   = 1200;
static const int MW_HEIGHT  = 800;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

    void resizeEvent(QResizeEvent* e);

    QPushButton* testButt;

    GLWidget* glWidget;

    QGridLayout*  leftLayout;
    QVBoxLayout*  rightLayout;
    QHBoxLayout*  mainLayout;
    QWidget*      layoutWidget;

    bool doProceed;
};

#endif // MAINWINDOW_H

    GlobalFunctions.cpp:

    #ifndef GLOBALS_H
#include "globals.h"
#endif

//---------- gSizeAndCenterWidget ---------

void gSizeAndCenterWidget (QWidget* widget, int width, int height) {
    int x,y;
    int screenWidth;
    int screenHeight;

    QDesktopWidget* desktop = QApplication::desktop();

    screenWidth = desktop->width();
    screenHeight = desktop->height();

    x = (screenWidth - width)/2;
    y = (screenHeight - height)/2;

    widget->setGeometry (x, y, width, height);
}//gSizeAndCenterWidget


//---------- gSizeAndCenterWidgetInWidget ---------

void gSizeAndCenterWidgetInWidget (QWidget* widget, QWidget* inWidget,
                                                            int sideMargin, int topBotMargin) {
    int x,y;
    int widWidth;
    int widHeight;
    int widX, widY;
    int width, height;

    widWidth  = inWidget->width();
    widHeight = inWidget->height();

    width  = inWidget->width() - 2*sideMargin;
    height = inWidget->height() - 2*topBotMargin;

    widX = inWidget->x();
    widY = inWidget->y();

    x = widX + (widWidth - width)/2;
    y = widY + (widHeight - height)/2;

    widget->setGeometry (x, y, width, height);
    widget->setFixedSize(width, height);
}//gSizeAndCenterWidgetInWidget

    GLWidget.cpp:

    #include "glwidget.h"


//---------- class GLWidget ----------

GLWidget::GLWidget(QWidget *parent) : QOpenGLWidget(parent),
                                          clearColor(Qt::gray),
                                          program(0)
{
    qDebug()<<"CONSTRUCTOR   GLWidget";

    alpha = 90.0;
    beta  = -90.0;
    distance = -8.0;
}//Constructor


//---------- ~GLWidget ----------

GLWidget::~GLWidget()
{
    qDebug()<<"DESTRUCTOR   GLWidget";
    makeCurrent();
    vbo.destroy();
    delete texture;
    delete program;
    tStruct.clear();
    doneCurrent();
}//Destructor

//---------- setClearColor ----------

void GLWidget::setClearColor(const QColor &color)
{
    clearColor = color;
    update();
}

//---------- initializeGL ----------

void GLWidget::initializeGL()
{
    initializeOpenGLFunctions();

    qDebug()<<"   initializeGL";

    makeObject();

    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);

    //---------- vertexShader

    QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
    const char *vsrc =

        "#version 130\n"
        "in vec4 vertex;\n"
        "in vec4 color;\n"
        "in vec2 texCoord;\n"

        "out vec2 texc;\n"
        "out vec4 tColor;\n"

        "uniform mat4 matrix;\n"

        "void main(void)\n"
        "{\n"
        "    gl_Position = matrix * vertex;\n"
        "    texc = texCoord;\n"
        "    tColor = color;\n"
        "}\n";
    vshader->compileSourceCode(vsrc);

    //---------- fragmentShader

    QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
    const char *fsrc =

        "#version 130\n"

        "uniform sampler2D texture;\n"

        "in vec2 texc;\n"
        "in vec4 tColor;\n"

        "void main(void)\n"
        "{\n"
            "gl_FragColor = texture2D(texture, texc);\n"
            //"gl_FragColor = tColor;\n"
        "}\n";
    fshader->compileSourceCode(fsrc);

    //----------

    program = new QOpenGLShaderProgram;
    program->addShader(vshader);
    program->addShader(fshader);

    program->bindAttributeLocation("vertex", VERTEX_ATTRIBUTE);
    program->bindAttributeLocation("color", COLOR_ATTRIBUTE);
    program->bindAttributeLocation("texCoord", TEXCOORD_ATTRIBUTE);
    program->link();

    program->bind();
    program->setUniformValue("texture", 0);
}//initializeGL


/*
struct gVertexDataStruct
{
    QVector4D position;
    QVector4D pixColor;
    QVector4D texCoord;
};
*/


//---------- paintGL ----------

void GLWidget::paintGL()
{
    glClearColor(clearColor.redF(), clearColor.greenF(), clearColor.blueF(), clearColor.alphaF());
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    //----------

    QMatrix4x4 vMatrix;
    QMatrix4x4  tMatrix;
    QMatrix4x4 cameraTrans;             //Identity matrix

    cameraTrans.translate(0.0, 5.0, 0.0);
    cameraTrans.rotate(alpha, 0, 1, 0);
    cameraTrans.rotate(beta, 1, 0, 0);

    QVector3D cameraPosition = cameraTrans * QVector3D(0, 0, distance);
    QVector3D cameraUpDirection = cameraTrans * QVector3D(0, 1, 0);
    vMatrix.lookAt(cameraPosition, QVector3D(0, 0, 0), cameraUpDirection);

    program->setUniformValue("matrix", pMatrix * vMatrix * tMatrix);

    program->enableAttributeArray(VERTEX_ATTRIBUTE);
    program->enableAttributeArray(COLOR_ATTRIBUTE);
    program->enableAttributeArray(TEXCOORD_ATTRIBUTE);

    int offset = 0;

    int stride = sizeof(gVertexDataStruct);

    program->setAttributeBuffer(VERTEX_ATTRIBUTE, GL_FLOAT,  offset,  4,  stride);

    offset = offset + sizeof(QVector4D);

    program->setAttributeBuffer(COLOR_ATTRIBUTE, GL_FLOAT,  offset,  4,  stride);

    offset = offset + sizeof(QVector4D);

    program->setAttributeBuffer(TEXCOORD_ATTRIBUTE, GL_FLOAT, offset,  4, stride);

    texture->bind();

    glDrawArrays(GL_TRIANGLES, 0, 10);
}

//---------- resizeGL ----------

void GLWidget::resizeGL(int width, int height)
{
    if (height == 0) {
        height = 1;
    }
    pMatrix.setToIdentity();
    pMatrix.perspective(60.0, (float) width / (float) height, 0.001, 1000);
    glViewport(0, 0, width, height);
}

//---------- mousePressEvent --------

void GLWidget :: mousePressEvent(QMouseEvent *event)
{
    lastMousePosition = event->pos();
    event->accept();
}//mousePressEvent

//---------- mouseMoveEvent --------

void GLWidget :: mouseMoveEvent(QMouseEvent *event)
{
    int deltaX = event->x() - lastMousePosition.x();
    int deltaY = event->y() - lastMousePosition.y();

    if (event->buttons() & Qt::LeftButton) {
        alpha -= deltaX;
        while (alpha < 0) {
            alpha += 360;
        }

        while (alpha >= 360) {
            alpha -= 360;
        }

        beta -= deltaY;
        if (beta < -90) {
            beta = -90;
        }

        if (beta > 90) {
            beta = 90;
        }
        update();
    }//if

    lastMousePosition = event->pos();
    event->accept();
}//mouseMoveEvent

//---------- wheelEvent --------

void GLWidget :: wheelEvent(QWheelEvent *event)
{
    int delta = event->delta();

    if (event->orientation() == Qt::Vertical) {
        if (delta < 0) {
            distance *= 1.1;
        } else if (delta > 0) {
            distance *= 0.9;
        }
        update();
    }//if

    event->accept();
}//wheelEvent

//---------- makeObject ----------

void GLWidget::makeObject()
{
    texture = new QOpenGLTexture(QImage("Insert Path to an Image Here").mirrored());

    //Drawing in the Z-X Plane

    gVertexDataStruct vData;

    vData.position = {-1, 0, -1, 1};
    vData.pixColor = {0.7, 0.2, 0.0, 1.0};  //Just a test color
    vData.texCoord = {0, 0};
    tStruct.append(vData);

    vData.position = {1, 0, -1, 1};
    vData.pixColor = {0.7, 0.2, 0.0, 1.0};
    vData.texCoord = {1, 0};
    tStruct.append(vData);

    vData.position = {1, 0, 1, 1};
    vData.pixColor = {0.7, 0.2, 0.0, 1.0};
    vData.texCoord = {1, 1};
    tStruct.append(vData);

    //----------

    vData.position = {-1, 0, -1, 1};
    vData.pixColor = {0.2, 0.7, 0.0, 1.0};
    vData.texCoord = {0, 0};
    tStruct.append(vData);

    vData.position = {1, 0, 1, 1};
    vData.pixColor = {0.2, 0.7, 0.0, 1.0};
    vData.texCoord = {1, 1};
    tStruct.append(vData);

    vData.position = {-1, 0, 1, 1};
    vData.pixColor = {0.2, 0.7, 0.0, 1.0};
    vData.texCoord = {0, 1};
    tStruct.append(vData);

    //----------

    vbo.create();
    vbo.bind();
    int numBytes = tStruct.count() * sizeof(gVertexDataStruct);
    vbo.allocate(tStruct.constData(), numBytes);
}//makeObject

    main.cpp:

    #include "mainwindow.h"

int main(int argc, char *argv[])
{
    int result;
    QApplication a(argc, argv);
    MainWindow* w = new MainWindow();
    gSizeAndCenterWidget (w, MW_WIDTH, MW_HEIGHT);

    //---------- Loop

    while (w->isVisible()){
        w->update();
        result = a.exec();
    }//while

    delete w;
    return result;
}

    Mainwindow.cpp:

    #include "mainwindow.h"


//---------- class MainWindow ----------

MainWindow :: MainWindow(QWidget *parent) : QMainWindow(parent)
{
    qDebug()<<"CONSTRUCTOR   MainWindow";

    doProceed = true;

    //----------

    glWidget = new GLWidget(this);

    QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    sizePolicy.setHorizontalStretch(0);
    sizePolicy.setVerticalStretch(0);
    glWidget->setSizePolicy(sizePolicy);

    layoutWidget = new QWidget(glWidget);
    layoutWidget->setGeometry(QRect(50, 50, 300, 200));
    layoutWidget->setSizePolicy(sizePolicy);

    setCentralWidget(layoutWidget);

    mainLayout  = new QHBoxLayout(layoutWidget);
    leftLayout  = new QGridLayout();
    rightLayout = new QVBoxLayout();

    leftLayout->addWidget(glWidget, 0, 0);

    testButt = new QPushButton("Test", this);
    testButt->setFixedWidth(120);
    testButt->setFixedHeight(24);

    QSizePolicy testSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    testSizePolicy.setHorizontalStretch(0);
    testSizePolicy.setVerticalStretch(0);
    testButt->setSizePolicy(testSizePolicy);

    rightLayout->addWidget(testButt);
    testButt->show();

    mainLayout->addLayout(leftLayout);
    mainLayout->addLayout(rightLayout);

    show();
    glWidget->show();
}//Constructor

//---------- Destructor ----------

MainWindow :: ~MainWindow()
{
    qDebug()<<"DESTRUCTOR   MainWindow";

    leftLayout->~QLayout();
    rightLayout->~QLayout();

}//Destructor

//---------- resizeEvent ----------

void MainWindow :: resizeEvent(QResizeEvent* e){
    //if (glWidget != NULL)
       // glWidget->setGeometry(0, 0, (this->width() - 150), this->height());
}//resizeEvent
    0
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