Displaying text in the corner in OpenGL

Displaying text in the corner in OpenGL



So recently i tried to do some displaying text in openGl, but i can make it appear


void renderBitmapString(float x, float y, char* text)
char *c;
glRasterPos3f(x, y, 6.0f);
for (c = text; *c != ''; c++)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, *c);


void Draw()



glPushMatrix();

float m_amb = 1.0f, 1.0f, 1.0f, 1.0f ;
float m_dif = 1.0f, 1.0f, 1.0f, 1.0f ;
float m_spe = 0.0f, 0.0f, 0.0f, 1.0f ;
glMaterialfv(GL_FRONT, GL_AMBIENT, m_amb);
glMaterialfv(GL_FRONT, GL_DIFFUSE, m_dif);
glMaterialfv(GL_FRONT, GL_SPECULAR, m_spe);
glBegin(GL_QUADS);

glNormal3f(0.0f, 0.0f, 1.0f);
glVertex3f(place.x -5.0f, place.y -5.0f, place.z + 5.0f);

glNormal3f(0.0f, 0.0f, 1.0f);
glVertex3f(place.x + 5.0f, place.y - 5.0f, place.z + 5.0f);

glNormal3f(0.0f, 0.0f, 1.0f);
glVertex3f(place.x + 5.0f, place.y + 5.0f, place.z + 5.0f);

glNormal3f(0.0f, 0.0f, 1.0f);
glVertex3f(place.x - 5.0f, place.y + 5.0f, place.z + 5.0f);

glEnd();

char text[50];
sprintf(text, "test");
glColor3f(1, 1, 1);
renderBitmapString(90, 95, text);

glEnable(GL_LIGHTING);
glEnable(GL_CULL_FACE);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);




It should render a plane and 'test' in the corner, but only plane is showing. Draw() is a public function in class Menu, while renderBitmapString is global function





Shouldn't you advance the position on screen with each character printed (i.e. move the glRasterPos3f inside the for loop in glutBitmapCharacter?
– orhtej2
Sep 2 at 18:11


glRasterPos3f


for


glutBitmapCharacter





This answer suggest using glWindowPos instead of glRasterPos.
– orhtej2
Sep 2 at 18:14


glWindowPos


glRasterPos





What is the window size respectively the viewport glViewport. What is the projection matrix and the model view matrix? Please read How to create a Minimal, Complete, and Verifiable example. Note, the z coordinate of the text is 6.0f. Is this in between the near and far plane? Is the text even on the viewport (in clip space) or is it outside at the top right?
– Rabbid76
Sep 2 at 18:19



glViewport






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