OpenGL Text
Author
I am trying to use the tutorial about bitmapped fonts to put the FPS of my application at the bottom of the screen. But the text won''t stay at the bottom. As you move around the world the text moves also. Sometimes you can''t even see it. When the text moves it moves somewhere betweent the center of the screen and the side. Or you just can''t see it.
You must not be making the appropriate openGL state changes during text drawing, this is the simple text class I wrote and use extensively:
// "Text.h"class CText {public: CText(char *TexName, HDC *hDC); virtual ~CText(); void Print(int x, int y, const char *fmt, ...);private: unsigned int iBase; HFONT Font;};// "Text.cpp"#include "Text.h"//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CText::CText(char * TexName, HDC *hDC){ iBase = glGenLists(96); // Storage For 96 Characters Font = CreateFont(16, // Height Of Font 0, // Width Of Font 0, // Angle Of Escapement 0, // Orientation Angle FW_BOLD,// Font Weight FALSE, // Italic FALSE, // Underline FALSE, // Strikeout ANSI_CHARSET, // Character Set Identifier OUT_TT_PRECIS, // Output Precision CLIP_DEFAULT_PRECIS, // Clipping Precision ANTIALIASED_QUALITY, // Output Quality FF_DONTCARE|DEFAULT_PITCH,// Family And Pitch TexName); // Font Name SelectObject(*hDC, Font); // Selects The Font We Want wglUseFontBitmaps(*hDC, 32, 96, iBase); // Builds 96 Characters Starting At Character 32}CText::~CText(){ glDeleteLists(iBase, 96); // Delete All 96 Characters}void CText::Print(int x, int y, const char *fmt, ...){ char text[256]; va_list ap; if (fmt == NULL) return; va_start(ap, fmt); vsprintf(text, fmt, ap); va_end(ap); glDisable(GL_LIGHTING); glDisable(GL_DEPTH_TEST); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); glOrtho(0,640,0,480,-100,100); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glTranslated(x,y,0); glRasterPos2f(0, 0); glPushAttrib(GL_LIST_BIT); glListBase(iBase - 32); glCallLists(strlen(text), GL_UNSIGNED_BYTE, text); glPopAttrib(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glMatrixMode(GL_MODELVIEW); glPopMatrix(); glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING);}
Hi,
You must do :
glDisable(GL_DEPTH_TEST) before writing your text on the screen.
If you want, I''ve a litte example who display the FPS on the top left corner with a rotating cube ?
Interessted ???
Send me a mail to : dylan.leyder@ibelgique.com
Leyder Dylan
dylan.leyder@ibelgique.com
You must do :
glDisable(GL_DEPTH_TEST) before writing your text on the screen.
If you want, I''ve a litte example who display the FPS on the top left corner with a rotating cube ?
Interessted ???
Send me a mail to : dylan.leyder@ibelgique.com
Leyder Dylan
dylan.leyder@ibelgique.com
R U sure you reset the Modelview Matrix BEFORE printig the text?
If not, insert this one before your output code:
glLoadIdentity(); // Reset The Current Modelview Matrix
SnAkE''s Programming Resources
If not, insert this one before your output code:
glLoadIdentity(); // Reset The Current Modelview Matrix
SnAkE''s Programming Resources
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