QOpenGLWidget Doku Haritalama sonuçları Siyah ekran

Question

QOpenGLWidget ile bir dörtlü bir doku kullanarak basit bir 2d resmi oluşturmaya çalışıyorum. Ama ne denediğim önemli değil, her zaman kara kutu alırım.

okudum birçok öğreticiler, benim RGB değerlerini depolayan bu

uchar* m_pData; 

gibi basit pixelbuffer var. Bu geçerli, çünkü glDrawPixles() ile test ettim. OpenGLWidget'i göz önünde bulundurarak üç en önemli işlevi yayınlayacağım. İlk

initializeGL():

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

// Clear the color 
float r = ((float)m_backColor.darker().red())/255.0f; 
float g = ((float)m_backColor.darker().green())/255.0f; 
float b = ((float)m_backColor.darker().blue())/255.0f; 
glClearColor(r,g,b,1.0f); 

// Set shading model. 
glShadeModel(GL_SMOOTH); 

// Set the viewport 
glViewport(0.f, 0.f, m_origW, m_origH); 

// Init. Projection Matrix 
glMatrixMode(GL_PROJECTION); 
glLoadIdentity(); 
glOrtho(0.0, m_origW, m_origH,0.0,1.0,-1.0); 

// Init Modelview Matrix 
glClearColor(0.f, 0.f, 0.f, 1.f); 

// Enable texturing 
glEnable(GL_TEXTURE_2D); 


// Generate texture ID 
glGenTextures(1, &m_textureID); 

// Bind texture ID 
glBindTexture(GL_TEXTURE_2D, m_textureID); 

// Set texture parameters 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
//glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
//glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 

// Generate Texture, and assign pixles to our texture ID 
if (m_pData != nullptr) 
{ 
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_origW, m_origH, 0, GL_RGB, GL_UNSIGNED_BYTE, (GLvoid*)m_pData); 
} 
else 
{ 
    qCritical("Buffer is empty!!"); 
} 

// Unbind texture 
glBindTexture(GL_TEXTURE_2D, NULL); 

// Check for Error 
GLenum error_ = glGetError(); 
if (error_ != GL_NO_ERROR) 
{ 
    qCritical("Error Loading Texture!"); 
} 

} 

Sonra paintGL():

void QGLImageviewer::paintGL() 
{ 
makeCurrent(); 

glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 
// Clear Screen And Depth Buffer 
glClear(GL_COLOR_BUFFER_BIT); 

if (!(m_renderQtImg->isNull())) 
{ 
    //QImage image; 

    int imWidth = m_renderQtImg->width(); 
    int imHeight = m_renderQtImg->height(); 

    // The image has to be resized to fit the widget 
    if (imWidth != this->size().width() && 
     imHeight != this->size().height()) 
    { 

     imWidth = this->size().width(); 
     imHeight = this->size().height(); 
    } 
    else 
    { 
     //image = *m_renderQtImg; 

     imWidth = m_origW; 
     imHeight = m_origH; 
    } 

    if (m_textureID != 0) 
    { 
     glMatrixMode(GL_MODELVIEW); 
     // Remove any previous transformations 
     glLoadIdentity(); 

     glPushMatrix(); 

     // Move to rendering point 
     glTranslatef(0.f, 0.f, 0.f); 
     glColor3f(0.0f, 0.0f, 0.5f); 

     // Set texture ID 
     glBindTexture(GL_TEXTURE_2D, m_textureID); 

     glBegin(GL_QUADS); 
     glTexCoord2f(0.f, 0.f); glVertex2f(0.f, 0.f); 
     glTexCoord2f(1.f, 0.f); glVertex2f(imWidth, 0.f); 
     glTexCoord2f(1.f, 1.f); glVertex2f(imWidth, imHeight); 
     glTexCoord2f(0.f, 1.f); glVertex2f(0.f, imHeight); 
     glEnd(); 

     //glDisable(GL_TEXTURE_2D); 
     glPopMatrix(); 
     glFlush(); 

    } 
} 
} 

Ve son ama en az resizeGL() değil:

void QGLImageviewer::resizeGL(int width, int height) 
{ 
makeCurrent(); 
glViewport(0,0,(GLint)width,(GLint)height); 
glMatrixMode(GL_PROJECTION); 
glLoadIdentity(); 
//gluOrtho2D(0.0, width, 0.0, height); 
glOrtho(0.0, width, 0.0, height, 0.0, 1.0); 

} 

Ben Qt5.6 kullanıyorum ve Microsoft Visual Studio 2015 derleyicisi.

Answer 1

Kahretsin, sorun

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_origW , m_origH, 0, GL_RGB, GL_UNSIGNED_BYTE, (float*)m_pData); 

My üye değişkenleri oldu m_orgiW ve m_orgiH0 için başlatılmıştır. Kodum işe yaramadı bu yüzden şaşırtıcı değil.

Kayıt kodumu yayınlamak için, QOpenGLWidget'un en önemli üç işlevi, aynı sorunu olan birisinin yararlı olacağını umuyorum.

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

float r = ((float)m_backColor.darker().red())/255.0f; 
float g = ((float)m_backColor.darker().green())/255.0f; 
float b = ((float)m_backColor.darker().blue())/255.0f; 
glClearColor(r,g,b,1.0f); 

// Generate texture ID 
glGenTextures(1, &m_textureID); 

// Bind texture ID 
glBindTexture(GL_TEXTURE_2D, m_textureID); 

if (m_pData != nullptr) 
{ 
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_origW , m_origH, 0, GL_RGB, GL_UNSIGNED_BYTE, (float*)m_pData); 
} 
else 
{ 
    qCritical("Buffer is empty!!"); 
} 

// Set texture parameters 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); //IMPORTANT FOR NON POWER OF 2 TEXTURES 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 

// Enable texturing Mapping 
glEnable(GL_TEXTURE_2D); 

// Enable Smooth Shading 
glShadeModel(GL_SMOOTH); 

// Black Background 
glClearColor(0.0f, 0.0f, 0.0f, 0.5f); 

// Depth Buffer Setup 
glClearDepth(1.0f); 

// Enables Depth Testing 
glEnable(GL_DEPTH_TEST); 

// Type of depth testing to do 
glDepthFunc(GL_LEQUAL); 

// Really Nice Perspective Calculations 
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); 

// Unbind Texture 
glBindTexture(GL_TEXTURE_2D, NULL); 
} 

Şimdi paintGL()

void QGLImageviewer::paintGL() 
{ 
makeCurrent(); 

// Clear Screen And Depth Buffer 
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

glEnable(GL_TEXTURE_2D); 
glBindTexture(GL_TEXTURE_2D, m_textureID); 

glBegin(GL_QUADS); 
// Drawing the quad with the texture mapped on it 
// 
// OpenGL 2D Coordinates 
// Sticking with the Coordinate Convention mentioned here 
glTexCoord2f(1.0f, 0.0f); glVertex2f(m_width, 0.0f); // vertex 1 
glTexCoord2f(1.0f, 1.0f); glVertex2f(m_width, m_height); // vertex 2 
glTexCoord2f(0.0f, 1.0f); glVertex2f(0.0f, m_height); // vertex 3 
glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0f, 0.0f); // vertex 4 

glEnd(); 


} 

Ve resizeGL()

void QGLImageviewer::resizeGL(int width, int height) 
{ 
makeCurrent(); 

m_width = width; 
m_height = height; 

// Compute aspect ratio of the new window 
if (height == 0) height = 1;    // To prevent divide by 0 
GLfloat aspect = (GLfloat)width/(GLfloat)height; 

// Set the viewport to cover the new window 
glViewport(0, 0, width, height); 

// Set the aspect ratio of the clipping area to match the viewport 
glMatrixMode(GL_PROJECTION); // To operate on the Projection matrix 
glLoadIdentity();    // Reset the projection matrix 

glOrtho(0, m_width/ m_zoomFactor, m_height/ m_zoomFactor,0, -1, 1); 

}