OpenGL text display using FTGL
Making the demo work on Ubuntu

tohare@quantum-solace:~/projects/ftgl-demo$ cat Makefile
FTGL_CPPFLAGS := $(shell pkg-config --cflags ftgl)
FTGL_LDFLAGS := $(shell pkg-config --libs-only-L ftgl)
FTGL_LIBS := $(shell pkg-config --libs-only-l ftgl)
OBJDIR := obj

CXX := g++
CXXFLAGS := -MMD -g -Wall -Wextra -Wno-unused-parameter -march=pentium4 -O2 $(FTGL_CPPFLAGS)

#INCLUDE :=
LDFLAGS := $(FTGL_LDFLAGS)
LDLIBS := $(FTGL_LIBS) -lglut

SRCScc := demo.cc
OBJS = $(patsubst %.cc,$(OBJDIR)/%.o,$(SRCScc))

# PHONY is used when the target is not a file
.PHONY: all clean

all: demo

demo: $(OBJS)
$(CXX) $(LDFLAGS) $^ $(LDLIBS) -o $@


$(OBJDIR)/%.o: %.cc
$(CXX) $(CXXFLAGS) $(INCLUDE) -c $< -o $@

-include $(OBJS:.o=.d)

demo.cc






tohare@quantum-solace:~/projects/ftgl-demo$ cat demo.cc
#include // exit()
#include

#include
#include

#include //"FTGLOutlineFont.h"
#include "FTGLPolygonFont.h"
#include "FTGLBitmapFont.h"
#include "FTGLTextureFont.h"
#include "FTGLPixmapFont.h"

static FTFont* fonts[5];
static int width;
static int height;

using namespace std;
void
my_init( const char* font_filename )
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

fonts[0] = new FTGLOutlineFont(font_filename);
fonts[1] = new FTGLPolygonFont(font_filename);
fonts[2] = new FTGLTextureFont(font_filename);
fonts[3] = new FTGLBitmapFont(font_filename);
fonts[4] = new FTGLPixmapFont(font_filename); // looks the best
for (int i=0; i< 5; i++) {
//if (!fonts[i]->Open(font_filename)) {
// cerr << "ERROR: Unable to open file " << font_filename << "\n";
//}
//else {
int point_size = 24;
if (!fonts[i]->FaceSize(point_size)) {
cerr << "ERROR: Unable to set font face size " << point_size << "\n";
}
//}
}
}

static void
do_ortho()
{
int w;
int h;
GLdouble size;
GLdouble aspect;

w = width;
h = height;
aspect = (GLdouble)w / (GLdouble)h;

// Use the whole window.
glViewport(0, 0, w, h);

// We are going to do some 2-D orthographic drawing.
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
size = (GLdouble)((w >= h) ? w : h) / 2.0;
if (w <= h) {
aspect = (GLdouble)h/(GLdouble)w;
glOrtho(-size, size, -size*aspect, size*aspect,
-100000.0, 100000.0);
}
else {
aspect = (GLdouble)w/(GLdouble)h;
glOrtho(-size*aspect, size*aspect, -size, size,
-100000.0, 100000.0);
}

// Make the world and window coordinates coincide so that 1.0 in
// model space equals one pixel in window space.
glScaled(aspect, aspect, 1.0);

// Now determine where to draw things.
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}


void
my_reshape(int w, int h)
{
width = w;
height = h;
}

void
my_handle_key(unsigned char key, int x, int y)
{
switch (key) {

case 27: // Esc - Quits the program.
for (int i=0; i<5; i++) {
if (fonts[i]) {
delete fonts[i];
fonts[i] = 0;
}
}
exit(1);
break;

default:
break;
}
}

void
draw_scene()
{
/* Set up some strings with the characters to draw. */
unsigned int count = 0;
char string[8][256];
int i;
for (i=1; i < 32; i++) { /* Skip zero - it's the null terminator! */
string[0][count] = i;
count++;
}
string[0][count] = '\0';

count = 0;
for (i=32; i < 64; i++) {
string[1][count] = i;
count++;
}
string[1][count] = '\0';

count = 0;
for (i=64; i < 96; i++) {
string[2][count] = i;
count++;
}
string[2][count] = '\0';

count = 0;
for (i=96; i < 128; i++) {
string[3][count] = i;
count++;
}
string[3][count] = '\0';

count = 0;
for (i=128; i < 160; i++) {
string[4][count] = i;
count++;
}
string[4][count] = '\0';

count = 0;
for (i=160; i < 192; i++) {
string[5][count] = i;
count++;
}
string[5][count] = '\0';

count = 0;
for (i=192; i < 224; i++) {
string[6][count] = i;
count++;
}
string[6][count] = '\0';

count = 0;
for (i=224; i < 256; i++) {
string[7][count] = i;
count++;
}
string[7][count] = '\0';


glColor3f(1.0, 1.0, 1.0);

for (int font = 0; font < 5; font++) {
GLfloat x = -250.0;
GLfloat y;
GLfloat yild = 20.0;
for (int j=0; j<4; j++) {
y = 275.0-font*120.0-j*yild;
if (font >= 3) {
glRasterPos2f(x, y);
fonts[font]->Render(string[j]);
}
else {
if (font == 2) {
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
glPushMatrix(); {
glTranslatef(x, y, 0.0);
fonts[font]->Render(string[j]);
} glPopMatrix();
if (font == 2) {
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
}
}
}
}
}


void
my_display(void)
{
glClear(GL_COLOR_BUFFER_BIT);

do_ortho();

draw_scene();

glutSwapBuffers();
}

int
main(int argc, char **argv)
{

glutInitWindowSize(600, 600);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE);

glutCreateWindow("FTGL demo");

int result = 1;
if ( argc != 2 ) {
cerr << "usage: " << argv[0] << " font_filename.ttf\n";
result = 0;
}
else {
my_init(argv[1]);

glutDisplayFunc(my_display);
glutReshapeFunc(my_reshape);
glutKeyboardFunc(my_handle_key);

glutMainLoop();
}
exit(result);
}