Hi, I am new to OpenGL. I am working on opengl with qt. what I need to do is to display one image. But this image is changing according my application. When I modify the “currentPixmap” out side paintGL(), it looks like my display texture is not updated, until I do window resize whatever to repaint. Here is my code:
void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);
glBindTexture( GL_TEXTURE_2D, fbObject->bindTexture(currentPixmap));
int i=currentPixmap.width(), j = currentPixmap.height();
GLfloat w = i;
GLfloat h = j;
glEnable(GL_TEXTURE_2D);
glPushMatrix();
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0);
glVertex3f(0, 0, -5.0);
glTexCoord2f(1.0, 0.0);
glVertex3f(w, 0, -5.0);
glTexCoord2f(1, 1);
glVertex3f(w, h, -5.0);
glTexCoord2f(0.0, 1);
glVertex3f(0, h, -5.0);
glEnd();
glPopMatrix();
glFlush();
}
what can I do to force it to update the texture?