client: implemented bullet tracer effect for weapon firing events

Author: SNMetamorph

client/events/game_event_utils.cpp

@@ -19,6 +19,7 @@ GNU General Public License for more details.
 #include "r_efx.h"
 #include "event_api.h"
 #include "event_args.h"
+#include "pm_defs.h"
 
 void GameEventUtils::EjectBrass(const Vector &origin, const Vector &angles, const Vector &velocity, int modelIndex, int soundType)
 {
@@ -29,6 +30,32 @@ void GameEventUtils::EjectBrass(const Vector &origin, const Vector &angles, cons
 		2.5, modelIndex, soundType);
 }
 
+void GameEventUtils::FireBullet(int entIndex, const matrix3x3 &camera, const Vector &origin, const Vector &direction, int tracerFreq)
+{
+	pmtrace_t tr;
+	Vector endPos = origin + direction * 8196.f;
+
+	gEngfuncs.pEventAPI->EV_SetUpPlayerPrediction(false, true);
+	gEngfuncs.pEventAPI->EV_PushPMStates();
+	gEngfuncs.pEventAPI->EV_SetSolidPlayers(entIndex - 1);
+	gEngfuncs.pEventAPI->EV_SetTraceHull(2); // 2 is a point hull
+	gEngfuncs.pEventAPI->EV_PlayerTrace(const_cast<float*>(&origin.x), endPos, PM_NORMAL, -1, &tr);
+	CreateTracer(camera, origin, tr.endpos, tracerFreq);
+	gEngfuncs.pEventAPI->EV_PopPMStates();
+}
+
+void GameEventUtils::CreateTracer(const matrix3x3 &camera, const Vector &origin, const Vector &end, int frequency)
+{
+	static int32_t count = 0;
+	if (count % frequency == 0) 
+	{
+		const Vector offset = Vector(0.f, 0.f, -4.f);
+		Vector startPos = origin + offset + camera.GetRight() * -6.f + camera.GetForward() * 10.f;
+		gEngfuncs.pEfxAPI->R_TracerEffect(startPos, const_cast<float*>(&end.x));
+	}
+	count++;
+}
+
 void GameEventUtils::SpawnMuzzleflash()
 {
 	cl_entity_t *ent = gEngfuncs.GetViewModel();

client/events/game_event_utils.h

@@ -15,9 +15,12 @@ GNU General Public License for more details.
 
 #pragma once
 #include "vector.h"
+#include "matrix.h"
 
 namespace GameEventUtils
 {
 	void EjectBrass(const Vector &origin, const Vector &angles, const Vector &velocity, int modelIndex, int soundType);
+	void FireBullet(int entIndex, const matrix3x3 &camera, const Vector &origin, const Vector &direction, int tracerFreq);
+	void CreateTracer(const matrix3x3 &camera, const Vector &origin, const Vector &end, int frequency);
 	void SpawnMuzzleflash();
 }

client/events/glock_fire_event.cpp

@@ -57,10 +57,16 @@ void CGlockFireEvent::Execute()
 	Vector shellOrigin = GetOrigin() + up * -12.0f + forward * 20.0f + right * 4.0f;
 
 	GameEventUtils::EjectBrass(shellOrigin, GetAngles(), shellVelocity, brassModelIndex, TE_BOUNCE_SHELL);
+	GameEventUtils::FireBullet(m_arguments->entindex, cameraMatrix, GetOrigin(), GetShootDirection(cameraMatrix), 1);
 	gEngfuncs.pEventAPI->EV_PlaySound( GetEntityIndex(), GetOrigin(), CHAN_WEAPON, "weapons/pl_gun3.wav", gEngfuncs.pfnRandomFloat(0.92, 1.0), ATTN_NORM, 0, 98 + gEngfuncs.pfnRandomLong(0, 3));
 }
 
 bool CGlockFireEvent::ClipEmpty() const
 {
 	return m_arguments->bparam1 != 0;
 }
+
+Vector CGlockFireEvent::GetShootDirection(const matrix3x3 &camera) const
+{
+	return camera.GetForward() + m_arguments->fparam1 * camera.GetRight() + m_arguments->fparam2 * camera.GetUp();
+}

client/events/glock_fire_event.h

@@ -15,6 +15,7 @@ GNU General Public License for more details.
 
 #pragma once
 #include "base_game_event.h"
+#include "matrix.h"
 
 class CGlockFireEvent : public CBaseGameEvent
 {
@@ -26,4 +27,5 @@ class CGlockFireEvent : public CBaseGameEvent
 
 private:
 	bool ClipEmpty() const;
+	Vector GetShootDirection(const matrix3x3 &camera) const;
 };