From a4866d2f23a08935f17f6732dac8f048c413b063 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dar=C3=ADo?= <dariosamo@gmail.com>
Date: Sun, 21 Dec 2025 00:01:11 -0300
Subject: [PATCH] Add tagging to weather effects for CCW. (#16)

---
 patches/transform_ids.h   |   5 ++
 patches/weather_patches.c | 104 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 patches/weather_patches.c

diff --git a/patches/transform_ids.h b/patches/transform_ids.h
index 0bf7aab..1eeef21 100644
--- a/patches/transform_ids.h
+++ b/patches/transform_ids.h
@@ -60,6 +60,11 @@
 #define MODEL_PARTICLE_TRANSFORM_ID_COUNT 0x02000000
 #define MODEL_PARTICLE_ID_MAX (MODEL_PARTICLE_TRANSFORM_ID_COUNT / MARKER_TRANSFORM_ID_COUNT)
 
+// Weather Particles: 0x30000000 - 0x30800000
+#define WEATHER_PARTICLE_TRANSFORM_ID_START 0x30000000
+#define WEATHER_PARTICLE_ID_COUNT 256
+#define WEATHER_PARTICLE_ID_MAX 0x8000
+
 // Markers: 0x10000000 - 0x1FFFFFFF
 #define BANJO_TRANSFORM_ID_START 0x10000000
 #define MARKER_TRANSFORM_ID_START (BANJO_TRANSFORM_ID_START + MARKER_TRANSFORM_ID_COUNT)
diff --git a/patches/weather_patches.c b/patches/weather_patches.c
new file mode 100644
index 0000000..08c7321
--- /dev/null
+++ b/patches/weather_patches.c
@@ -0,0 +1,104 @@
+#include "patches.h"
+#include "transform_ids.h"
+#include "functions.h"
+#include "core1/core1.h"
+
+extern s32 func_8033A170(void);
+
+u32 weather_particle_spawn_count = 0;
+
+u32 get_weather_particle_id(struct5s *p) {
+    u8 *padding = p->pad35;
+    u32 id = (padding[0] << 16) | (padding[1] << 8) | (padding[2] << 0);
+    return id;
+}
+
+void set_weather_particle_id(struct5s *p, u32 id) {
+    u8 *padding = p->pad35;
+    padding[0] = (id >> 16) & 0xFF;
+    padding[1] = (id >> 8) & 0xFF;
+    padding[2] = (id >> 0) & 0xFF;
+}
+
+// @recomp Patched to assign an interpolation ID to the weather particle when it's created.
+RECOMP_PATCH void func_802F87B0(struct6s *this) {
+    f32 plyrPos[3]; //sp7C
+    f32 camNorm[3]; //sp70
+    f32 camRot[3]; //sp64
+    struct5s *ptr;
+    f32 f20;
+    int i;
+    f32 sp4C[3];
+
+    if (vector_size(this->unk1C) >= this->unk20)
+        return;
+
+    player_getPosition(plyrPos);
+    viewport_getLookVector(camNorm);
+    viewport_getRotation_vec3f(camRot);
+    ptr = vector_pushBackNew(&this->unk1C);
+    f20 = randf2(50.0f, 1200.0f);
+    sp4C[0] = 0.0f;
+    sp4C[1] = randf2(200.0f, 500.0f);
+    sp4C[2] = -f20;
+
+    if (LENGTH_VEC3F((&this->unkC)) < 5.0f) {
+        ml_vec3f_yaw_rotate_copy(sp4C, sp4C, randf2(0.0f, 360.0f));
+    }
+    else {
+        ml_vec3f_yaw_rotate_copy(sp4C, sp4C, camRot[1] + randf2(-70.0f, 70.0f));
+    }//L802F88F0
+    sp4C[0] += plyrPos[0];
+    sp4C[1] += plyrPos[1];
+    sp4C[2] += plyrPos[2];
+    if (f20 < 600.0) {
+        for (i = 0; i < 10 && viewport_isPointPlane_3f(sp4C[0], sp4C[1] - 10.0f, sp4C[2]); i++) {
+            sp4C[1] += 100.0f;
+        }
+    }
+    ptr->unk4[0] = sp4C[0];
+    ptr->unk4[1] = sp4C[1];
+    ptr->unk4[2] = sp4C[2];
+
+    ptr->unk10[0] = 0.0f;
+    ptr->unk10[1] = randf2(-100.0f, -100.0f);
+    ptr->unk10[2] = 0.0f;
+
+    ptr->unk1C[0] = ptr->unk1C[1] = ptr->unk1C[2] = 0.0f;
+
+    ptr->unk28[0] = randf2(-300.0f, 300.0f);
+    ptr->unk28[1] = randf2(-300.0f, 300.0f);
+    ptr->unk28[2] = randf2(-300.0f, 300.0f);
+
+    this->unk34++;
+    if (!(this->unk34 < 4))
+        this->unk34 = 0;
+
+    ptr->unk0 = this->unk24[this->unk34];
+
+    // @recomp Set the weather particle's ID based on the particle spawn count and increment it.
+    set_weather_particle_id(ptr, weather_particle_spawn_count++);
+    if (weather_particle_spawn_count >= WEATHER_PARTICLE_ID_MAX) {
+        weather_particle_spawn_count = 0;
+    }
+}
+
+// @recomp Patched to tag the weather effect for interpolation.
+RECOMP_PATCH void func_802F8A90(struct6s *this, Gfx **gdl, Mtx **mptr, Vtx **vptr) {
+    struct5s *startPtr = vector_getBegin(this->unk1C);
+    struct5s *iPtr;
+    struct5s *endPtr = vector_getEnd(this->unk1C);
+    for (iPtr = startPtr; iPtr < endPtr; iPtr++) {
+        modelRender_setDepthMode(MODEL_RENDER_DEPTH_COMPARE);
+
+        // @recomp Set the model transform ID before drawing the weather particle.
+        cur_drawn_model_transform_id = WEATHER_PARTICLE_TRANSFORM_ID_START + WEATHER_PARTICLE_ID_COUNT * get_weather_particle_id(iPtr);
+
+        modelRender_draw(gdl, mptr, iPtr->unk4, iPtr->unk1C, 1.0f, NULL, iPtr->unk0);
+
+        // @recomp Clear the model transform ID after drawing the weather particle.
+        cur_drawn_model_transform_id = 0;
+
+        iPtr->unk34 = func_8033A170();
+    }
+}
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