tr1/effects: add dynamic light to guns and explosions

This adds dynamic light for explosion and (enemy) gunshots.

Resolves #2357.

docs/tr1/CHANGELOG.md

@@ -9,6 +9,7 @@
 - added pause screen support to demos
 - added a fade-out effect when exiting the pause screen to the inventory
 - added exit fade-out effects (#2348)
+- added optional dynamic lighting for gun flashes and explosions, similar to TR2+ (#2357)
 - ⚠️ changed the game data to use a separate strings file for text information, removing it from the game flow file
 - changed the sprite limit from 512 to 1024
 - changed demo to be interrupted only by esc or action keys

docs/tr1/README.md

@@ -519,6 +519,7 @@ Not all options are turned on by default. Refer to `TR1X_ConfigTool.exe` for det
 - added support for animated room sprites, which also restores intended behavior in, for example, The Cistern room 0
 - added skybox support, with a default option provided for Lost Valley, Colosseum and Obelisk of Khamoon; custom level builders can use object slot `184`
 - added reflections of Midas Hand death animation and savegame crystals
+- added optional dynamic lighting for gun flashes and explosions, similar to TR2+
 - changed the Scion in The Great Pyramid from spawning blood when hit to a ricochet effect
 - fixed thin black lines between polygons
 - fixed black screen flashing when navigating the inventory

src/tr1/game/objects/effects/explosion.c

@@ -3,6 +3,9 @@
 #include "game/effects.h"
 #include "global/vars.h"
 
+#include <libtrx/config.h>
+#include <libtrx/game/output.h>
+
 void Explosion_Setup(OBJECT *obj)
 {
     obj->control = Explosion_Control;
@@ -11,11 +14,15 @@ void Explosion_Setup(OBJECT *obj)
 void Explosion_Control(int16_t effect_num)
 {
     EFFECT *effect = Effect_Get(effect_num);
+    const OBJECT *const obj = Object_GetObject(effect->object_id);
     effect->counter++;
     if (effect->counter == 2) {
         effect->counter = 0;
         effect->frame_num--;
-        if (effect->frame_num <= g_Objects[effect->object_id].mesh_count) {
+        if (g_Config.gameplay.enable_gun_flash
+            && effect->frame_num > obj->mesh_count) {
+            Output_AddDynamicLight(effect->pos, 13, 11);
+        } else if (effect->frame_num <= obj->mesh_count) {
             Effect_Kill(effect_num);
         }
     }

src/tr1/game/objects/effects/gunshot.c

@@ -3,6 +3,9 @@
 #include "game/effects.h"
 #include "game/random.h"
 
+#include <libtrx/config.h>
+#include <libtrx/game/output.h>
+
 void GunShot_Setup(OBJECT *obj)
 {
     obj->control = GunShot_Control;
@@ -17,4 +20,7 @@ void GunShot_Control(int16_t effect_num)
         return;
     }
     effect->rot.z = Random_GetControl();
+    if (g_Config.gameplay.enable_gun_flash) {
+        Output_AddDynamicLight(effect->pos, 12, 11);
+    }
 }