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glfont.cpp File Reference

#include <windows.h>
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <gl\gl.h>
#include "glfont.h"

Go to the source code of this file.

Functions
int	glFontCreate (GLFONT *Font, char *FileName, int Tex)
void	glFontDestroy (GLFONT *Font)
void	glFontBegin (GLFONT *Font)
void	glFontEnd (void)
void	glFontTextOut (char *String, float x, float y, float z)
Variables
GLFONT *	glFont

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Function Documentation

void glFontBegin (  GLFONT *    Font )

Definition at line 94 of file glfont.cpp. References GLFONT::Char, and GLFONT::Tex. Referenced by DrawGLScene(). { //Save pointer to font structure if (Font->Char != NULL) glFont = Font; else glFont = NULL; //Bind to font texture glBindTexture(GL_TEXTURE_2D, Font->Tex); }

int glFontCreate (  GLFONT *    Font, char *    FileName, int    Tex )

Definition at line 25 of file glfont.cpp. References GLFONT::Char, FALSE, GLFONT::IntEnd, GLFONT::IntStart, GLFONT::Tex, GLFONT::TexHeight, GLFONT::TexWidth, and TRUE. Referenced by InitGL(). { FILE *Input; char *TexBytes; int Num; //Open font file if ((Input = fopen(FileName, "rb")) == NULL) return FALSE; //Read glFont structure fread(Font, sizeof(GLFONT), 1, Input); //Save texture number Font->Tex = Tex; //Get number of characters Num = Font->IntEnd - Font->IntStart + 1; //Allocate memory for characters if ((Font->Char = (GLFONTCHAR *)malloc( sizeof(GLFONTCHAR) * Num)) == NULL) return FALSE; //Read glFont characters fread(Font->Char, sizeof(GLFONTCHAR), Num, Input); //Get texture size Num = Font->TexWidth * Font->TexHeight * 2; //Allocate memory for texture data if ((TexBytes = (char *)malloc(Num)) == NULL) return FALSE; //Read texture data fread(TexBytes, sizeof(char), Num, Input); //Set texture attributes glBindTexture(GL_TEXTURE_2D, Font->Tex); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); //Create texture glTexImage2D(GL_TEXTURE_2D, 0, 2, Font->TexWidth, Font->TexHeight, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, (void *)TexBytes); //Clean up free(TexBytes); fclose(Input); //Return pointer to new font return TRUE; }

void glFontDestroy (  GLFONT *    Font )

Definition at line 88 of file glfont.cpp. References GLFONT::Char. { //Free character memory free(Font->Char); }

void glFontEnd (  void    )

Definition at line 106 of file glfont.cpp. Referenced by DrawGLScene(). { //Font no longer current glFont = NULL; }

void glFontTextOut (  char *    String, float    x, float    y, float    z )

Definition at line 112 of file glfont.cpp. References GLFONT::Char, GLFONTCHAR::dx, GLFONTCHAR::dy, GLFONT::IntStart, GLFONTCHAR::tx1, GLFONTCHAR::tx2, GLFONTCHAR::ty1, and GLFONTCHAR::ty2. Referenced by DrawGLScene(). { int Length, i; GLFONTCHAR *Char; //Return if we don't have a valid glFont if (glFont == NULL) return; //Get length of string Length = strlen(String); //Begin rendering quads glBegin(GL_QUADS); //Loop through characters for (i = 0; i < Length; i++) { //Get pointer to glFont character Char = &glFont->Char[(int)String[i] - glFont->IntStart]; //Specify vertices and texture coordinates glTexCoord2f(Char->tx1, Char->ty1); glVertex3f(x, y, z); glTexCoord2f(Char->tx1, Char->ty2); glVertex3f(x, y - Char->dy, z); glTexCoord2f(Char->tx2, Char->ty2); glVertex3f(x + Char->dx, y - Char->dy, z); glTexCoord2f(Char->tx2, Char->ty1); glVertex3f(x + Char->dx, y, z); //Move to next character x += Char->dx; } //Stop rendering quads glEnd(); }

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Variable Documentation

GLFONT* glFont

Definition at line 20 of file glfont.cpp.

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