From 96f5668957c5f2acf00d34cc37bad5f8033b5925 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dar=C3=ADo?= <dariosamo@gmail.com>
Date: Sat, 20 Dec 2025 17:40:38 -0300
Subject: [PATCH] Fix interpolation on bee swarms. (#14)

---
 patches/specific_actor_patches.c | 78 ++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 patches/specific_actor_patches.c

diff --git a/patches/specific_actor_patches.c b/patches/specific_actor_patches.c
new file mode 100644
index 0000000..ea8122e
--- /dev/null
+++ b/patches/specific_actor_patches.c
@@ -0,0 +1,78 @@
+#include "patches.h"
+#include "functions.h"
+#include "transform_ids.h"
+#include "bk_api.h"
+
+#define IDS_PER_BEE 8
+
+typedef struct {
+    f32 unk0[3];
+    f32 unkC[3];
+    f32 unk18[3];
+    f32 unk24[3];
+}Struct_core2_47BD0_0;
+
+typedef struct {
+    s32 unk0;
+    u8 unk4;
+    u8 unk5;
+    u8 unk6;
+    u8 unk7;
+    Struct_core2_47BD0_0 *unk8;
+    f32 unkC[3];
+    f32 unk18;
+    f32 unk1C;
+    BKModelBin *unk20;
+    s32 unk24;
+}ActorLocal_core2_47BD0;
+
+extern s32 func_8033A170(void);
+
+// @recomp Patched to give the bees in the bee swarm individual IDs. The bees can show interpolation glitches otherwise, as they all share one matrix
+// group and can get culled individually based on distance. This is easily reproduceable by walking into a beehive with bees from a far away distance.
+RECOMP_PATCH Actor *chBeeSwarm_draw(ActorMarker *marker, Gfx **gfx, Mtx **mtx, Vtx **vtx) {
+    Actor *this;
+    ActorLocal_core2_47BD0 *local;
+    BKModelBin *phi_fp;
+    s32 phi_s2;
+    f32 sp8C[3];
+    f32 sp80[3];
+    Struct_core2_47BD0_0 *phi_s0;
+
+    this = marker_getActor(marker);
+    local = (ActorLocal_core2_47BD0 *)&this->local;
+    phi_fp = marker_loadModelBin(marker);
+    for (phi_s2 = 0, phi_s0 = local->unk8; phi_s2 < local->unk0; phi_s2++) {
+        sp80[0] = 0.0f;
+        sp80[1] = phi_s0->unk24[1] - 90.0f;
+        sp80[2] = 0.0f;
+
+        sp8C[0] = this->position[0] + phi_s0->unk0[0];
+        sp8C[1] = this->position[1] + phi_s0->unk0[1];
+        sp8C[2] = this->position[2] + phi_s0->unk0[2];
+
+        // @recomp Set the model transform ID.
+        s32 cur_drawn_marker_spawn_index = bkrecomp_get_marker_spawn_index(marker);
+        u32 transform_id = MARKER_TRANSFORM_ID_START + cur_drawn_marker_spawn_index * MARKER_TRANSFORM_ID_COUNT + phi_s2 * IDS_PER_BEE;
+        u32 prev_transform_id = cur_drawn_model_transform_id;
+        cur_drawn_model_transform_id = transform_id;
+
+        modelRender_setDepthMode(MODEL_RENDER_DEPTH_COMPARE);
+        modelRender_setAlpha(0xFF);
+        modelRender_draw(gfx, mtx, sp8C, sp80, 0.25f, NULL, phi_fp);
+
+        local->unk5 |= func_8033A170();
+        if (phi_s2 < 10) {
+            sp8C[1] = local->unk18 + 6.0f;
+            modelRender_setAlpha(0xC0);
+            modelRender_setDepthMode(MODEL_RENDER_DEPTH_COMPARE);
+            modelRender_draw(gfx, mtx, sp8C, sp80, 0.1f, NULL, local->unk20);
+            local->unk5 |= func_8033A170();
+        }
+        phi_s0++;
+
+        // @recomp Reset the model transform ID.
+        cur_drawn_model_transform_id = prev_transform_id;
+    }
+    return this;
+}
\ No newline at end of file