Implement the Lightning Gun.

8 files changed, 186 insertions, 4 deletions

diff --git a/src/cgame/cg_local.h b/src/cgame/cg_local.h
index a477336..72b5a96 100644
--- a/src/cgame/cg_local.h
+++ b/src/cgame/cg_local.h
@@ -1336,6 +1336,8 @@ typedef struct
   qhandle_t   headShotPS;
   qhandle_t   humanWoundsBleedPS;
   qhandle_t   alienWoundsBleedPS;
+
+  qhandle_t   lightningBeam;
 } cgMedia_t;
 
 typedef struct
diff --git a/src/cgame/cg_main.c b/src/cgame/cg_main.c
index b7885ec..9abdc7e 100644
--- a/src/cgame/cg_main.c
+++ b/src/cgame/cg_main.c
@@ -821,7 +821,8 @@ static void CG_RegisterGraphics( void )
   cgs.media.healthCrossPoisoned       = trap_R_RegisterShader( "ui/assets/neutral/cross_poison.tga" );
   
   cgs.media.upgradeClassIconShader    = trap_R_RegisterShader( "icons/icona_upgrade.tga" );
-  
+
+  cgs.media.lightningBeam             = trap_R_RegisterShader( "gfx/lightning/beam" );
 
   cgs.media.disconnectPS              = CG_RegisterParticleSystem( "disconnectPS" );
 
diff --git a/src/cgame/cg_weapons.c b/src/cgame/cg_weapons.c
index 04f6495..86306e1 100644
--- a/src/cgame/cg_weapons.c
+++ b/src/cgame/cg_weapons.c
@@ -866,6 +866,60 @@ static float CG_MachinegunSpinAngle( centity_t *cent, qboolean firing )
   return angle;
 }
 
+/*
+=============
+CG_RenderBeam
+=============
+*/
+
+void CG_RenderGenericBeam( const vec3_t start, const vec3_t end, qhandle_t shader, float radius )
+{
+	vec3_t delta, viewdelta, side;
+	float length;
+	polyVert_t quad[ 4 ];
+
+	VectorSubtract( end, start, delta );
+	length = VectorLength( delta );
+	VectorSubtract( start, cg.refdef.vieworg, viewdelta );
+	CrossProduct( delta, viewdelta, side );
+	VectorNormalize( side );
+
+	VectorMA( start, radius, side, quad[ 3 ].xyz );
+	VectorMA( start, -radius, side, quad[ 2 ].xyz );
+	VectorMA( end, -radius, side, quad[ 1 ].xyz );
+	VectorMA( end, radius, side, quad[ 0 ].xyz );
+
+	quad[ 0 ].st[ 0 ] = length / radius * 0.1;
+	quad[ 0 ].st[ 1 ] = 0;
+	quad[ 0 ].modulate[ 0 ] = 255;
+	quad[ 0 ].modulate[ 1 ] = 255;
+	quad[ 0 ].modulate[ 2 ] = 255;
+	quad[ 0 ].modulate[ 3 ] = 255;
+
+	quad[ 1 ].st[ 0 ] = length / radius * 0.1;
+	quad[ 1 ].st[ 1 ] = 1;
+	quad[ 1 ].modulate[ 0 ] = 255;
+	quad[ 1 ].modulate[ 1 ] = 255;
+	quad[ 1 ].modulate[ 2 ] = 255;
+	quad[ 1 ].modulate[ 3 ] = 255;
+
+	quad[ 2 ].st[ 0 ] = 0;
+	quad[ 2 ].st[ 1 ] = 1;
+	quad[ 2 ].modulate[ 0 ] = 255;
+	quad[ 2 ].modulate[ 1 ] = 255;
+	quad[ 2 ].modulate[ 2 ] = 255;
+	quad[ 2 ].modulate[ 3 ] = 255;
+
+	quad[ 3 ].st[ 0 ] = 0;
+	quad[ 3 ].st[ 1 ] = 0;
+	quad[ 3 ].modulate[ 0 ] = 255;
+	quad[ 3 ].modulate[ 1 ] = 255;
+	quad[ 3 ].modulate[ 2 ] = 255;
+	quad[ 3 ].modulate[ 3 ] = 255;
+
+	trap_R_AddPolyToScene( shader, 4, quad );
+}
+
 
 /*
 =============
@@ -876,6 +930,7 @@ The main player will have this called for BOTH cases, so effects like light and
 sound should only be done on the world model case.
 =============
 */
+
 void CG_AddPlayerWeapon( refEntity_t *parent, playerState_t *ps, centity_t *cent )
 {
   refEntity_t   gun;
@@ -1114,6 +1169,52 @@ void CG_AddPlayerWeapon( refEntity_t *parent, playerState_t *ps, centity_t *cent
       cent->muzzlePsTrigger = qfalse;
     }
 
+		if( weaponNum == WP_LIGHTNING_GUN )
+		{
+			attachment_t attachment;
+			vec3_t muzzle, forward, end, beam_start;
+			trace_t tr;
+
+			if( ps )
+			{
+				BG_GetClientViewOrigin( ps, muzzle );
+				AngleVectors( ps->viewangles, forward, NULL, NULL );
+			}
+			else
+			{
+				// NOTE: this code assumes that the player's normal is (0,0,1)
+				//       it will break when humans start walking on walls
+				class_t class = ( cent->currentState.misc >> 8 ) & 0xFF;
+
+				VectorCopy( cent->lerpOrigin, muzzle );
+
+				// the only way to tell if a human is crouching is to check its bbox
+				// which is transmitted in a weird, encoded form (hence the magic number)
+				if( class == PCL_HUMAN && cent->currentState.solid == 3151887 )
+					muzzle[ 2 ] += BG_ClassConfig( class )->crouchViewheight;
+				else
+					muzzle[ 2 ] += BG_ClassConfig( class )->viewheight;
+
+				AngleVectors( cent->lerpAngles, forward, NULL, NULL );
+			}
+
+			VectorMA( muzzle, LIGHTNING_RANGE, forward, end );
+
+			CG_Trace( &tr, muzzle, NULL, NULL, end, cg.predictedPlayerState.clientNum, MASK_SHOT );
+
+			memset( &attachment, 0, sizeof( attachment ) );
+
+			if( noGunModel )
+				CG_SetAttachmentTag( &attachment, *parent, parent->hModel, "tag_weapon" );
+			else
+				CG_SetAttachmentTag( &attachment, gun, gun.hModel, "tag_flash" );
+
+			CG_AttachToTag( &attachment );
+
+			if( CG_AttachmentPoint( &attachment, beam_start ) )
+				CG_RenderGenericBeam( beam_start, tr.endpos, cgs.media.lightningBeam, 3 );
+		}
+
     // make a dlight for the flash
     if( weapon->wim[ weaponMode ].flashDlightColor[ 0 ] ||
         weapon->wim[ weaponMode ].flashDlightColor[ 1 ] ||
diff --git a/src/game/bg_misc.c b/src/game/bg_misc.c
index 742363d..efdc300 100644
--- a/src/game/bg_misc.c
+++ b/src/game/bg_misc.c
@@ -3575,6 +3575,31 @@ static const weaponAttributes_t bg_weapons[ ] =
     TEAM_HUMANS           //team_t    team;
   },
   {
+    WP_LIGHTNING_GUN,     //int       weaponNum;
+    LIGHTNING_PRICE,      //int       price;
+    STAGE_GE_5,           //int  stages
+    SLOT_WEAPON,          //int       slots;
+    "lightning",          //char      *weaponName;
+    "[yefarms]Lightning Gun",     //char      *humanName;
+    "This is a lightning gun. It guns lightning.",
+    LIGHTNING_AMMO,       //int       maxAmmo;
+    0,                    //int       maxClips;
+    qfalse,               //int       infiniteAmmo;
+    qtrue,                //int       usesEnergy;
+    LIGHTNING_REPEAT,     //int       repeatRate1;
+    0,                    //int       repeatRate2;
+    0,                    //int       repeatRate3;
+    0,                    //int       reloadTime;
+    LIGHTNING_K_SCALE,    //float     knockbackScale;
+    qfalse,               //qboolean  hasAltMode;
+    qfalse,               //qboolean  hasThirdMode;
+    qfalse,               //qboolean  canZoom;
+    90.0f,                //float     zoomFov;
+    qtrue,                //qboolean  purchasable;
+    qtrue,                //qboolean  longRanged;
+    TEAM_HUMANS           //team_t    team;
+  },
+  {
     WP_LUCIFER_CANNON,    //int       weaponNum;
     LCANNON_PRICE,        //int       price;
     STAGE_GE_5,           //int  stages
diff --git a/src/game/bg_mod.h b/src/game/bg_mod.h
index 4929b32..6f09037 100644
--- a/src/game/bg_mod.h
+++ b/src/game/bg_mod.h
@@ -8,6 +8,7 @@ MOD( MOD_CHAINGUN ),
 MOD( MOD_PRIFLE ),
 MOD( MOD_MDRIVER ),
 MOD( MOD_LASGUN ),
+MOD( MOD_LIGHTNING ),
 MOD( MOD_LCANNON ),
 MOD( MOD_LCANNON_SPLASH ),
 MOD( MOD_FLAMER ),
diff --git a/src/game/bg_public.h b/src/game/bg_public.h
index c0b6381..18b0d2e 100644
--- a/src/game/bg_public.h
+++ b/src/game/bg_public.h
@@ -356,6 +356,7 @@ typedef enum
   WP_CHAINGUN,
   WP_FLAMER,
   WP_PULSE_RIFLE,
+  WP_LIGHTNING_GUN,
   WP_LUCIFER_CANNON,
   WP_ROCKET_LAUNCHER,
   WP_GRENADE,
diff --git a/src/game/g_weapon.c b/src/game/g_weapon.c
index d869fb1..1c333ab 100644
--- a/src/game/g_weapon.c
+++ b/src/game/g_weapon.c
@@ -819,9 +819,7 @@ void LCChargeFire( gentity_t *ent, qboolean secondary )
 
 /*
 ======================================================================
-
-PULSE RIFLE
-
+ROCKET LAUNCHER
 ======================================================================
 */
 
@@ -830,6 +828,48 @@ void rocketLauncherFire( gentity_t *ent )
   fire_rocket( ent, muzzle, forward );
 }
 
+
+/*
+======================================================================
+LIGHTNING GUN
+======================================================================
+*/
+
+void lightningGunFire( gentity_t *ent )
+{
+	vec3_t start, end;
+	trace_t tr;
+	gentity_t *target;
+
+	VectorMA( muzzle, LIGHTNING_RANGE, forward, end );
+
+	G_UnlaggedOn( ent, muzzle, LIGHTNING_RANGE );
+	trap_Trace( &tr, muzzle, NULL, NULL, end, ent->s.number, MASK_SHOT );
+	G_UnlaggedOff( );
+
+	if( tr.fraction == 1.0f ||
+	    tr.entityNum == ENTITYNUM_NONE ||
+	    ( tr.surfaceFlags & SURF_NOIMPACT ) )
+		return;
+
+	target = g_entities + tr.entityNum;
+
+	if( target->s.eType == ET_PLAYER || target->s.eType == ET_BUILDABLE )
+		BloodSpurt( ent, target, &tr );
+	else
+	{
+		gentity_t *tent;
+
+		tent = G_TempEntity( tr.endpos, EV_MISSILE_MISS );
+		tent->s.eventParm = DirToByte( tr.plane.normal );
+		tent->s.weapon = ent->s.weapon;
+		tent->s.generic1 = ent->s.generic1;
+  }
+
+	G_Damage( target, ent, ent, forward, tr.endpos, LIGHTNING_DAMAGE, 0, MOD_LIGHTNING );
+}
+
+
 /*
 ======================================================================
 TESLA GENERATOR
@@ -1976,6 +2016,9 @@ void FireWeapon( gentity_t *ent )
     case WP_ROCKET_LAUNCHER:
       rocketLauncherFire( ent );
       break;
+    case WP_LIGHTNING_GUN:
+      lightningGunFire( ent );
+      break;
     case WP_GRENADE:
       throwGrenade( ent );
       break;
diff --git a/src/game/tremulous.h b/src/game/tremulous.h
index e7512d5..b42a7b4 100644
--- a/src/game/tremulous.h
+++ b/src/game/tremulous.h
@@ -514,6 +514,14 @@ TREMULOUS EDGE MOD SRC FILE
 #define PRIFLE_SECONDARY_SPEED      800
 #define PRIFLE_SECONDARY_REPEAT     400
 
+#define LIGHTNING_PRICE             500
+#define LIGHTNING_AMMO              500
+#define LIGHTNING_K_SCALE           500
+#define LIGHTNING_DPS               100 // damage per second
+#define LIGHTNING_REPEAT            50 // keep it as low as possible
+#define LIGHTNING_DAMAGE            ( LIGHTNING_DPS * LIGHTNING_REPEAT / 1000 )
+#define LIGHTNING_RANGE             450
+
 #define LCANNON_PRICE               600
 #define LCANNON_AMMO                80
 #define LCANNON_K_SCALE             1.0f