/*=============================================================================
	text.cpp: Basic OpenGL Framework text function definitions

    Revision history:
	* Created by Zack Smith October 9, 2000
=============================================================================*/
#include <windows.h>		// Header File For Windows
#include <math.h>	    	// Header File For Windows Math Library
#include <stdio.h>	    	// Header File For Standard Input/Output
#include <gl\gl.h>			// Header File For The OpenGL32 Library
#include <gl\glu.h>			// Header File For The GLu32 Library
#include <gl\glaux.h>		// Header File For The Glaux Library
#include "text.h"

#include "application.h"

CText::CText()
: pTexture(NULL),
  hFont(0)
{
	pApp->pLog->Log("Text Class...initialized");
}

CText::~CText()
{
    // Delete The Font From Memory
	glDeleteLists(base,256);							// Delete All 256 Display Lists

	if (hFont)
		DeleteObject(hFont);

	if (pTexture)
		delete pTexture;

	pApp->pLog->Log("Text Class...destroyed");
}

CText::LoadFont(char* szTexture)
{
	pTexture = new CTexture();
	if (!pTexture->LoadGLTexture(szTexture))						// Jump To Texture Loading Routine
	{
		return FALSE;									// If Texture Didn't Load Return FALSE
	}
	// Build Our Font Display List
	float	cx;											// Holds Our X Character Coord
	float	cy;											// Holds Our Y Character Coord

	base=glGenLists(256);								// Creating 256 Display Lists
	glBindTexture(GL_TEXTURE_2D, pTexture->texture2d);			// Select Our Font Texture
	for (int loop=0; loop<256; loop++)						// Loop Through All 256 Lists
	{
		cx=float(loop%16)/16.0f;						// X Position Of Current Character
		cy=float(loop/16)/16.0f;						// Y Position Of Current Character

		glNewList(base+loop,GL_COMPILE);				// Start Building A List
			glBegin(GL_QUADS);							// Use A Quad For Each Character
				glTexCoord2f(cx,1-cy-0.0625f);			// Texture Coord (Bottom Left)
				glVertex2i(0,0);						// Vertex Coord (Bottom Left)
				glTexCoord2f(cx+0.0625f,1-cy-0.0625f);	// Texture Coord (Bottom Right)
				glVertex2i(16,0);						// Vertex Coord (Bottom Right)
				glTexCoord2f(cx+0.0625f,1-cy);			// Texture Coord (Top Right)
				glVertex2i(16,16);						// Vertex Coord (Top Right)
				glTexCoord2f(cx,1-cy);					// Texture Coord (Top Left)
				glVertex2i(0,16);						// Vertex Coord (Top Left)
			glEnd();									// Done Building Our Quad (Character)
			glTranslated(10,0,0);						// Move To The Right Of The Character
		glEndList();									// Done Building The Display List
	}
	return TRUE;
}

GLvoid CText::glPrint(const char *fmt, ...)
{
	char		text[256];			// Holds our string
	va_list  ap;                    // Pointer to list of arguments

	if (fmt == NULL)                 // If there's no text
		return;                      // Do nothing;


	va_start(ap, fmt);				// Parses The String For Variables
	    vsprintf(text, fmt, ap);	// And Converts Symbols To Actual Numbers
	va_end(ap);						// Results Are Stored In Text

	// Pushes The Display List Bits
	glPushAttrib(GL_LIST_BIT);
	
	glListBase(base - 32);								// Sets The Base Character to 32
	glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);	// Draws The Display List Text
	
	glPopAttrib();										// Pops The Display List Bits
}

void CText::BuildFont(char *szFontFace, int iSize, int fnWeight)
{
	hFont = CreateFont(-iSize, 
				0, 0, 0, 
				fnWeight,
				FALSE, FALSE, FALSE,
				ANSI_CHARSET, OUT_TT_PRECIS, 0, ANTIALIASED_QUALITY, 0,
				szFontFace);

	// make the system font the device context's selected font 
	SelectObject (pApp->pView->hDC, hFont); 
 
	// create the bitmap display lists 
	// we're making images of glyphs 32 thru 128 
	base = glGenLists(96);
	pApp->pLog->Log("Font created, base = %d", base);
	wglUseFontBitmaps (pApp->pView->hDC, 32, 96, base); 
}