#include <stdio.h>
#include <string.h>
#include "gamefontgl.h"

#include <GL/gl.h>
#include <GL/glut.h>

#include <il/il.h>
#include <il/ilu.h>
#include <il/ilut.h>

const int c_Width = 800, c_Height = 600;
const char *c_displayMode = "800x600:16@60";

ILuint ilutFontId =0, ilutPictureId =0;

void cbDisplay()
{
    static bool initialized = false;
    static unsigned int fontId, texFont, texPicture;
	static int count = 0;

    if (!initialized) {
			
		ilutRenderer( ILUT_OPENGL );

		// Load the font image
		ilGenImages( 1, &ilutFontId );
		ilBindImage( ilutFontId );		
	
		if (!ilLoadImage( "fatmarker512.png" )) {
			printf("Loading image failed\n");
		}
		
		texFont = ilutGLBindTexImage();

		// Load the picture image
		ilGenImages( 1, &ilutPictureId );
		ilBindImage( ilutPictureId );		
	
		if (!ilLoadImage( "bridge.jpg" )) {
			printf("Loading image failed\n");
		}
		
		texPicture = ilutGLBindTexImage();


					 		
		// Create a font by passing in an opengl texture id
		fontId = gfCreateFont( texFont );

		// A ,finfo file contains the metrics for a font. These
		// are generated by the Fontpack utility.
		gfLoadFontMetrics( fontId, "fatmarker512.finfo");

		printf("font has %d chars\n", 
				gfGetFontMetric( fontId, GF_FONT_NUMCHARS )
				);
		
		gfEnableFont( fontId, 64 );

		initialized = true;	

    }

	// Clear the screen    	
    glClear( GL_COLOR_BUFFER_BIT );

	// draw a 3d scene
	glMatrixMode( GL_PROJECTION );
	glLoadIdentity();
	gluPerspective( 90, (float)c_Width/(float)c_Height, 0.1, 10.0 );

	glMatrixMode( GL_MODELVIEW );
	glLoadIdentity();

	glBindTexture( GL_TEXTURE_2D, texPicture );

	float angle = (float)count;
	glTranslated( 0.0, 0.0, -1.5 );	
	glRotated( angle, 0.0, 1.0, 0.0 );
	
	glBegin( GL_QUADS );	

	glColor3f( 1.0, 1.0, 1.0 );
	glBegin( GL_QUADS );

	glTexCoord2d( 0.0, 1.0 );
	glVertex3f( -1.0,  1.0, 0.0 );

	glTexCoord2d( 0.0, 0.0 );
	glVertex3f( -1.0, -1.0, 0.0 );

	glTexCoord2d( 1.0, 0.0 );
	glVertex3f(  1.0, -1.0, 0.0 );

	glTexCoord2d( 1.0, 1.0 );
	glVertex3f(  1.0,  1.0, 0.0 );
	glEnd();	

	// Now draw some text on top.
	
	// Use gfBeginText(), gfDrawString() and gfEndText() to draw text.
	glColor3f( 1.0, 1.0, 1.0 );
	gfEnableFont( fontId, 64 );
	
	gfBeginText();

	glPushMatrix();
	glTranslated( 300, 100, 0 );
	gfDrawString("Hello World!\nWhats up?" );	
	glPopMatrix();
	
	// You can use gfGetStringWidth/Height to get the size of text.
	// Let's draw a box around "Hello World"
	int textW = gfGetStringWidth( "Hello World!"),
		textH = gfGetStringHeight( "Hello World!");

	// turn off the texutre to draw some lines
	glColor3f( 1.0, 0.0, 0.0 );
	glDisable( GL_TEXTURE_2D );
	glLineWidth( 2 );

	// gfBeginText() has set up 2d coordinates already.
	// we can draw in screen space between gfBegin/EndText()
	//
	// Our box starts at the baseline, and characters can drop
	// below that (especially if they have decenders, like j,y,q, etc.. 
	// so it won't completely contain the text.
	//
	// If the box looks too tall, that's because it's using the "leading"
	// of the font. You can change the leading with glSetCharsetMetric(...)
	glBegin( GL_LINE_LOOP );
	glVertex3f( 300, 100, 0 );	
	glVertex3f( 300 + textW, 100, 0 );
	glVertex3f( 300 + textW, 100+textH, 0 );
	glVertex3f( 300, 100+textH, 0 );
	glEnd();	

	gfEndText();

	// turn texture back on
	glEnable( GL_TEXTURE_2D );
	
	
	// Scaling text allows you to approximate other font sizes.
	// You can change the text color with regular gl commands
	gfBeginText();
	glColor3f( 1.0, 0.6, 1.0 ); 
	glTranslated( 400, 500, 0 );
	
	glScaled( 0.3, 0.4, 1.0 );

	gfDrawString(	"This is the gamefontgl example.\n"
					"glgamefont is an easy way to display\n"
					"text in an OpenGL program.\n" );
	gfEndText();


	// gfDrawStringFmt works like printf!
	gfBeginText();
	glTranslated( 20, 300, 0 );
	glColor3f( 0.0, 0.0, 1.0 );
	gfDrawStringFmt( "Redraw Count %d.\n", count );
	gfEndText(); 
	
    glutSwapBuffers();

	count++;
}

void cbIdle() 
{
	glutPostRedisplay();
}

int main( int argc, char **argv ) 
{
    
    glutInitWindowPosition ( 0, 0 ) ;
    glutInitWindowSize( c_Width, c_Height );
    
    glutInit( &argc, argv ) ;
    glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ) ;
    
    if ((argc==2) && (!strcmp(argv[1], "-fullscreen"))) {    
		glutGameModeString( c_displayMode );		
	
		glutEnterGameMode();
    } else {  
		glutCreateWindow( "Font Test/Demo"  ) ;
    }

	// initilize il
	ilInit();

    glClearColor( 0.5, 0.5, 1, 1.0 );
    
    glutDisplayFunc( cbDisplay ) ;
    glutIdleFunc( cbIdle  ) ;
//    glutSpecialFunc( cbSpecial ) ;
//    glutMouseFunc( cbMouse ) ;
    
    glDisable(GL_DEPTH_TEST );
    
    //glutMotionFunc      ( motionfn  ) ;
//    glutKeyboardFunc    ( cbKey ) ;
    
    glutMainLoop () ;	

	return 0;
}