Xash3DArchive/client/hud/hud_health.cpp

/***
*
*	Copyright (c) 1996-2002, Valve LLC. All rights reserved.
*	
*	This product contains software technology licensed from Id 
*	Software, Inc. ("Id Technology").  Id Technology (c) 1996 Id Software, Inc. 
*	All Rights Reserved.
*
*   Use, distribution, and modification of this source code and/or resulting
*   object code is restricted to non-commercial enhancements to products from
*   Valve LLC.  All other use, distribution, or modification is prohibited
*   without written permission from Valve LLC.
*
****/
//
// Health.cpp
//
// implementation of CHudHealth class
//

#include "extdll.h"
#include "hud_iface.h"
#include "hud.h"

DECLARE_MESSAGE( m_Health, Health )
DECLARE_MESSAGE( m_Health, Damage )

#define PAIN_NAME	"hud_pain"
#define DAMAGE_NAME	"sprites/%d_dmg.spr"

int giDmgHeight, giDmgWidth;

int giDmgFlags[NUM_DMG_TYPES] = 
{
	DMG_POISON,
	DMG_ACID,
	DMG_FREEZE|DMG_SLOWFREEZE,
	DMG_DROWN,
	DMG_BURN|DMG_SLOWBURN,
	DMG_NERVEGAS, 
	DMG_RADIATION,
	DMG_SHOCK,
	DMG_NUCLEAR
};

int CHudHealth :: Init( void )
{
	HOOK_MESSAGE( Health );
	HOOK_MESSAGE( Damage );
	m_iHealth = 100;
	m_fFade = 0;
	m_iFlags = 0;
	m_bitsDamage = 0;
	m_fAttackFront = m_fAttackRear = m_fAttackRight = m_fAttackLeft = 0;
	giDmgHeight = 0;
	giDmgWidth = 0;

	memset( m_dmg, 0, sizeof(DAMAGE_IMAGE) * NUM_DMG_TYPES );
	gHUD.AddHudElem( this );

	return 1;
}

void CHudHealth :: Reset( void )
{
	// make sure the pain compass is cleared when the player respawns
	m_fAttackFront = m_fAttackRear = m_fAttackRight = m_fAttackLeft = 0;

	// force all the flashing damage icons to expire
	m_bitsDamage = 0;
	for( int i = 0; i < NUM_DMG_TYPES; i++ )
	{
		m_dmg[i].fExpire = 0;
	}
}

int CHudHealth :: VidInit( void )
{
	m_hSprite = 0;

	m_HUD_dmg_bio = gHUD.GetSpriteIndex( "dmg_bio" ) + 1;
	m_HUD_cross = gHUD.GetSpriteIndex( "cross" );

	giDmgHeight = gHUD.GetSpriteRect(m_HUD_dmg_bio).right - gHUD.GetSpriteRect(m_HUD_dmg_bio).left;
	giDmgWidth = gHUD.GetSpriteRect(m_HUD_dmg_bio).bottom - gHUD.GetSpriteRect(m_HUD_dmg_bio).top;
	return 1;
}

int CHudHealth :: MsgFunc_Health( const char *pszName, int iSize, void *pbuf )
{
	// TODO: update local health data
	BEGIN_READ( pszName, iSize, pbuf );
	int x = READ_BYTE();

	m_iFlags |= HUD_ACTIVE;

	// only update the fade if we've changed health
	if( x != m_iHealth )
	{
		m_fFade = FADE_TIME;
		m_iHealth = x;
	}
	END_READ();

	return 1;
}

int CHudHealth :: MsgFunc_Damage( const char *pszName,  int iSize, void *pbuf )
{
	BEGIN_READ( pszName, iSize, pbuf );

	int armor = READ_BYTE();		// armor
	int damageTaken = READ_BYTE();	// health
	long bitsDamage = READ_LONG();	// damage bits

	vec3_t vecFrom;

	for( int i = 0 ; i < 3 ; i++)
		vecFrom[i] = READ_COORD();

	UpdateTiles( gHUD.m_flTime, bitsDamage );

	// actually took damage?
	if( damageTaken > 0 || armor > 0 )
		CalcDamageDirection(vecFrom);
	END_READ();

	return 1;
}

// Returns back a color from the
// Green <-> Yellow <-> Red ramp
void CHudHealth :: GetPainColor( int &r, int &g, int &b )
{
	int iHealth = m_iHealth;

	if( iHealth > 25 )
		iHealth -= 25;
	else if( iHealth < 0 )
		iHealth = 0;

	if( m_iHealth > 25 )
	{
		UnpackRGB( r, g, b, gHUD.m_iHUDColor );
	}
	else
	{
		r = 250;
		g = 0;
		b = 0;
	}
}

int CHudHealth :: Draw( float flTime )
{
	int r, g, b;
	int a = 0, x, y;
	int HealthWidth;

	if((gHUD.m_iHideHUDDisplay & HIDEHUD_HEALTH) || IsSpectateOnly())
		return 1;

	if( !m_hSprite )
		m_hSprite = LOAD_SHADER( PAIN_NAME );
	
	// has health changed? Flash the health #
	if( m_fFade )
	{
		m_fFade -= (gHUD.m_flTimeDelta * 20);
		if( m_fFade <= 0 )
		{
			a = MIN_ALPHA;
			m_fFade = 0;
		}

		// fade the health number back to dim
		a = MIN_ALPHA +  (m_fFade/FADE_TIME) * 128;

	}
	else a = MIN_ALPHA;

	// if health is getting low, make it bright red
	if( m_iHealth <= 15 ) a = 255;
		
	GetPainColor( r, g, b );
	ScaleColors( r, g, b, a );

	// only draw health if we have the suit.
	if( gHUD.m_iHideHUDDisplay & ITEM_SUIT )
	{
		HealthWidth = gHUD.GetSpriteRect(gHUD.m_HUD_number_0).right - gHUD.GetSpriteRect(gHUD.m_HUD_number_0).left;
		int CrossWidth = gHUD.GetSpriteRect(m_HUD_cross).right - gHUD.GetSpriteRect(m_HUD_cross).left;

		y = SCREEN_HEIGHT - gHUD.m_iFontHeight - gHUD.m_iFontHeight / 2;
		x = CrossWidth / 2;

		SPR_Set( gHUD.GetSprite( m_HUD_cross ), r, g, b );
		SPR_DrawAdditive( 0, x, y, &gHUD.GetSpriteRect( m_HUD_cross ));

		x = CrossWidth + HealthWidth / 2;

		x = gHUD.DrawHudNumber( x, y, DHN_3DIGITS | DHN_DRAWZERO, m_iHealth, r, g, b );

		x += HealthWidth / 2;

		int iHeight = gHUD.m_iFontHeight;
		int iWidth = HealthWidth / 10;

		UnpackRGB( r, g, b, gHUD.m_iHUDColor );
		FillRGBA( x, y, iWidth, iHeight, r, g, b, a );
	}

	DrawDamage( flTime );
	return DrawPain( flTime );
}

void CHudHealth :: CalcDamageDirection( Vector vecFrom )
{
	Vector forward, right, up;
	float side, front;
	Vector vecOrigin, vecAngles;

	if( vecFrom == Vector( 0, 0, 0 ))
	{
		m_fAttackFront = m_fAttackRear = m_fAttackRight = m_fAttackLeft = 0;
		return;
	}

	memcpy( vecOrigin, gHUD.m_vecOrigin, sizeof( vec3_t ));
	memcpy( vecAngles, gHUD.m_vecAngles, sizeof( vec3_t ));

	vecFrom -= vecOrigin;

	float flDistToTarget = vecFrom.Length();

	vecFrom = vecFrom.Normalize();
	AngleVectors( vecAngles, forward, right, up );

	front = vecFrom.Dot( right );
	side = vecFrom.Dot( forward );

	if( flDistToTarget <= 50 )
	{
		m_fAttackFront = m_fAttackRear = m_fAttackRight = m_fAttackLeft = 1;
	}
	else 
	{
		if( side > 0 )
		{
			if( side > 0.3 )
				m_fAttackFront = max( m_fAttackFront, side );
		}
		else
		{
			float f = fabs( side );
			if( f > 0.3 )
				m_fAttackRear = max( m_fAttackRear, f );
		}

		if( front > 0 )
		{
			if( front > 0.3 )
				m_fAttackRight = max( m_fAttackRight, front );
		}
		else
		{
			float f = fabs( front );
			if( f > 0.3 )
				m_fAttackLeft = max( m_fAttackLeft, f );
		}
	}
}

int CHudHealth :: DrawPain( float flTime )
{
	if(!( m_fAttackFront || m_fAttackRear || m_fAttackLeft || m_fAttackRight ))
		return 1;

	int r, g, b;
	int x, y, a, shade;

	// TODO:  get the shift value of the health
	a = 255;	// max brightness until then

	float fFade = gHUD.m_flTimeDelta * 2;
	
	// SPR_Draw top
	if( m_fAttackFront > 0.4 )
	{
		GetPainColor( r, g, b );
		shade = a * max( m_fAttackFront, 0.5 );
		ScaleColors( r, g, b, shade );
		SPR_Set( m_hSprite, r, g, b );

		x = SCREEN_WIDTH / 2 - SPR_Width( m_hSprite, 0 ) / 2;
		y = SCREEN_HEIGHT / 2 - SPR_Height( m_hSprite, 0 ) * 3;
		SPR_DrawAdditive( 0, x, y, NULL );
		m_fAttackFront = max( 0, m_fAttackFront - fFade );
	}
	else m_fAttackFront = 0;

	if( m_fAttackRight > 0.4 )
	{
		GetPainColor( r, g, b );
		shade = a * max( m_fAttackRight, 0.5 );
		ScaleColors( r, g, b, shade );
		SPR_Set( m_hSprite, r, g, b );

		x = SCREEN_WIDTH / 2 + SPR_Width( m_hSprite, 1 ) * 2;
		y = SCREEN_HEIGHT / 2 - SPR_Height( m_hSprite,1 ) / 2;
		SPR_DrawAdditive( 1, x, y, NULL );
		m_fAttackRight = max( 0, m_fAttackRight - fFade );
	}
	else m_fAttackRight = 0;

	if( m_fAttackRear > 0.4 )
	{
		GetPainColor( r, g, b );
		shade = a * max( m_fAttackRear, 0.5 );
		ScaleColors(r, g, b, shade);
		SPR_Set(m_hSprite, r, g, b );

		x = SCREEN_WIDTH / 2 - SPR_Width( m_hSprite, 2 ) / 2;
		y = SCREEN_HEIGHT / 2 + SPR_Height( m_hSprite, 2 ) * 2;
		SPR_DrawAdditive( 2, x, y, NULL);
		m_fAttackRear = max( 0, m_fAttackRear - fFade );
	}
	else m_fAttackRear = 0;

	if( m_fAttackLeft > 0.4 )
	{
		GetPainColor( r, g, b );
		shade = a * max( m_fAttackLeft, 0.5 );
		ScaleColors( r, g, b, shade );
		SPR_Set( m_hSprite, r, g, b );

		x = SCREEN_WIDTH / 2 - SPR_Width( m_hSprite, 3 ) * 3;
		y = SCREEN_HEIGHT / 2 - SPR_Height( m_hSprite,3 ) / 2;
		SPR_DrawAdditive( 3, x, y, NULL );

		m_fAttackLeft = max( 0, m_fAttackLeft - fFade );
	}
	else m_fAttackLeft = 0;

	return 1;
}

int CHudHealth :: DrawDamage( float flTime )
{
	int r, g, b, a;
	DAMAGE_IMAGE *pdmg;

	if( !m_bitsDamage )
		return 1;

	UnpackRGB( r, g, b, gHUD.m_iHUDColor );
	
	a = (int)(fabs(sin( flTime * 2)) * 256.0 );

	ScaleColors( r, g, b, a );

	// draw all the items
	for( int i = 0; i < NUM_DMG_TYPES; i++ )
	{
		if( m_bitsDamage & giDmgFlags[i] )
		{
			pdmg = &m_dmg[i];
			SPR_Set( gHUD.GetSprite( m_HUD_dmg_bio + i ), r, g, b );
			SPR_DrawAdditive( 0, pdmg->x, pdmg->y, &gHUD.GetSpriteRect( m_HUD_dmg_bio + i ));
		}
	}

	// check for bits that should be expired
	for( i = 0; i < NUM_DMG_TYPES; i++ )
	{
		DAMAGE_IMAGE *pdmg = &m_dmg[i];

		if( m_bitsDamage & giDmgFlags[i] )
		{
			pdmg->fExpire = min( flTime + DMG_IMAGE_LIFE, pdmg->fExpire );

			// when the time has expired and the flash is at the low point of the cycle
			if( pdmg->fExpire <= flTime && a < 40 )	
			{
				pdmg->fExpire = 0;

				int y = pdmg->y;
				pdmg->x = pdmg->y = 0;

				// move everyone above down
				for( int j = 0; j < NUM_DMG_TYPES; j++ )
				{
					pdmg = &m_dmg[j];
					if(( pdmg->y ) && ( pdmg->y < y ))
						pdmg->y += giDmgHeight;

				}
				m_bitsDamage &= ~giDmgFlags[i];  // clear the bits
			}
		}
	}
	return 1;
}

void CHudHealth :: UpdateTiles( float flTime, long bitsDamage )
{	
	DAMAGE_IMAGE *pdmg;

	// Which types are new?
	long bitsOn = ~m_bitsDamage & bitsDamage;
	
	for( int i = 0; i < NUM_DMG_TYPES; i++ )
	{
		pdmg = &m_dmg[i];

		// is this one already on?
		if( m_bitsDamage & giDmgFlags[i] )
		{
			pdmg->fExpire = flTime + DMG_IMAGE_LIFE; // extend the duration
			if( !pdmg->fBaseline )
				pdmg->fBaseline = flTime;
		}

		// are we just turning it on?
		if( bitsOn & giDmgFlags[i] )
		{
			// put this one at the bottom
			pdmg->x = giDmgWidth / 8;
			pdmg->y = SCREEN_HEIGHT - giDmgHeight * 2;
			pdmg->fExpire=flTime + DMG_IMAGE_LIFE;
			
			// move everyone else up
			for( int j = 0; j < NUM_DMG_TYPES; j++ )
			{
				if( j == i ) continue;

				pdmg = &m_dmg[j];
				if( pdmg->y )
					pdmg->y -= giDmgHeight;

			}
			pdmg = &m_dmg[i];
		}	
	}	

	// damage bits are only turned on here;  they are turned off when the draw time has expired (in DrawDamage())
	m_bitsDamage |= bitsDamage;
}