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glut /printf

Started by Slinky360 Aug 17, 2006 at 9:02 PM 5 replies 2.9k views

Original Post

Aug 17, 2006 at 9:02 PM

Is there any way i can use the printf with glut? I need to check some variables at runtime. I used to program with Allegro. Things are alot different with a glut window.

Limitz

Aug 17, 2006 at 9:05 PM

can't you just compile it as a console application... printf should end up in the console window. Otherwise you could always use a file to write to using fprintf, in stead of stdout.

Greetings.

Slinky360

Aug 17, 2006 at 9:17 PM

Thanks for the reply.

I could compile as a console app i suppose. With allegro, it was easy to display text on screen. With opengl, it seems i would have to import some fonts first.

Limitz

Aug 17, 2006 at 9:41 PM

Quote:
Original post by Slinky360
Thanks for the reply.

I could compile as a console app i suppose. With allegro, it was easy to display text on screen. With opengl, it seems i would have to import some fonts first.

Yeah i know. I just implemented it :)

Maybe it helps:

/* Project : Athamae Engine * File    : ./Font.cpp * Version : 0.1 * Created : 24/05/2006 * Updated : 28/05/2006 * * Description: Load a font and draw text * */#include "Font.h"namespace Engine{  Font::Font(char* fontname, int size)  {    this->init(fontname, size, 0);  }  Font::Font(char* fontname, int size, int styleFlags)  {    this->init(fontname, size, styleFlags);  }  Font::~Font()  {    glDeleteLists(this->listBase,96);  }  void Font::init(char* fontname, int size, int styleFlags)  {    HFONT font, oldfont;    HDC   hDC = Core::Screen::GetInstance()->HDC();    this->listBase = glGenLists(96);    font = CreateFont(size, 0, 0, 0,                      (styleFlags & FONTSTYLE_BOLD        ? 800 : 0),                      (styleFlags & FONTSTYLE_ITALIC      ? 1   : 0),                      (styleFlags & FONTSTYLE_UNDERLINE   ? 1   : 0),                      (styleFlags & FONTSTYLE_STRIKEOUT   ? 1   : 0),                      ANSI_CHARSET,                      OUT_TT_PRECIS,                      CLIP_DEFAULT_PRECIS,                      ANTIALIASED_QUALITY,                      FF_DONTCARE|DEFAULT_PITCH,                      fontname);    oldfont = (HFONT)SelectObject(hDC, font);    wglUseFontBitmaps(hDC,32,96, listBase);    SelectObject(hDC, oldfont);    DeleteObject(font);  }  void Font::DrawText(const char* format, ...)  {    char    text[256];    va_list args;    va_start(args,format);    vsprintf(text,format,args);    va_end(args);    glPushAttrib(GL_LIST_BIT);    glListBase(this->listBase-32);    glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);    glPopAttrib();  }}

EDIT: you will need to set up a orthogonal projection matrix as well

this is what my HUD does for now:

/* Project : Athamae Engine * File    : ./HUD.cpp * Version : 0.1 * Created : 20/04/2006 * Updated : 28/05/2006 * * Description: * */#include "HUD.h"using namespace Core;namespace Engine{  HUD::HUD()  {    this->font = new Font("Distress",24);  }  HUD::~HUD()  {    delete this->font;  }  //protected  void HUD::Start()  {    glMatrixMode(GL_PROJECTION);    glPushMatrix();    glLoadIdentity();    gluOrtho2D(0,Screen::GetInstance()->Width(),0,Screen::GetInstance()->Height());    glMatrixMode(GL_MODELVIEW);glPushMatrix();    glLoadIdentity();  }  void HUD::End()  {    glMatrixMode(GL_PROJECTION);    glPopMatrix();    glMatrixMode(GL_MODELVIEW);    glPopMatrix();  }  void HUD::Draw()  {    this->Start();    glDisable(GL_LIGHTING);    glRasterPos3f(15,10,0.2);    glColor3f(1,1,1);    font->DrawText("Athamae Font Test");    //font->DrawText("FPS: %-3.f  YAW: %-4.0f  PITCH: %-4.0f  ROLL: %-4.0f  THROTTLE: %-4.0f  POV: %-4.0f",fr,joy_rz*100, joy_y*100, joy_x*100, joy_throttle*100, joy_pov);    glEnable(GL_LIGHTING);    this->End();  }  void HUD::Initialize()  {  }}

Slinky360

Aug 17, 2006 at 10:18 PM

I will stick to the console window for now. Still a newbee with opengl. I could write a basic "mario" game on allegro. But i know very little about the whole 3d / opengl world. Still havent learnt matrices yet.

Blasteroids

Aug 19, 2006 at 8:10 AM

That was me above. Sorry I thought I was already logged in :(

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