From ab346f1b4295006e12d893e800fd549be758ec88 Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Mon, 13 Oct 2025 23:10:39 -0500
Subject: [PATCH] feat(model): add CM2Model::SetGeometryVisible

---
 src/model/CM2Model.cpp | 56 ++++++++++++++++++++++++++++++++++++++++++
 src/model/CM2Model.hpp |  2 ++
 2 files changed, 58 insertions(+)

diff --git a/src/model/CM2Model.cpp b/src/model/CM2Model.cpp
index 64408cc..d474f75 100644
--- a/src/model/CM2Model.cpp
+++ b/src/model/CM2Model.cpp
@@ -1524,6 +1524,58 @@ void CM2Model::SetBoneSequenceDeferred(uint16_t a2, M2Data* data, uint16_t boneI
     // TODO
 }
 
+void CM2Model::SetGeometryVisible(uint32_t start, uint32_t end, int32_t visible) {
+    // Waiting for load
+
+    if (!this->m_loaded) {
+        auto modelCall = STORM_NEW(CM2ModelCall);
+
+        modelCall->type = 1;
+        modelCall->modelCallNext = nullptr;
+        modelCall->time = this->m_scene->m_time;
+        modelCall->args[0] = start;
+        modelCall->args[1] = end;
+        modelCall->args[2] = visible;
+
+        *this->m_modelCallTail = modelCall;
+        this->m_modelCallTail = &modelCall->modelCallNext;
+
+        return;
+    }
+
+    // No skin sections
+
+    if (!this->m_shared->skinProfile->skinSections.Count()) {
+        return;
+    }
+
+    // Update visibility
+
+    bool visibilityChanged = false;
+
+    for (uint32_t i = 0; i < this->m_shared->skinProfile->skinSections.Count(); i++) {
+        auto& skinSection = this->m_shared->skinProfile->skinSections[i];
+        auto modelSkinSection = &this->m_skinSections[i];
+
+        // Out of range
+        if (skinSection.skinSectionId < start || skinSection.skinSectionId > end) {
+            continue;
+        }
+
+        // No change
+        if (*modelSkinSection == 0 && visible == 0 || *modelSkinSection == 1 && visible == 1) {
+            continue;
+        }
+
+        *modelSkinSection = visible;
+        visibilityChanged = true;
+    }
+
+    if (visibilityChanged) {
+        this->UnoptimizeVisibleGeometry();
+    }
+}
+
 void CM2Model::SetIndices() {
     // TODO
 }
@@ -1736,6 +1788,10 @@ void CM2Model::UnlinkFromCallbackList() {
     }
 }
 
+void CM2Model::UnoptimizeVisibleGeometry() {
+    // TODO
+}
+
 void CM2Model::UnsetBoneSequence(uint32_t boneId, int32_t a3, int32_t a4) {
     // TODO
 }
diff --git a/src/model/CM2Model.hpp b/src/model/CM2Model.hpp
index fba4c20..2eda9ca 100644
--- a/src/model/CM2Model.hpp
+++ b/src/model/CM2Model.hpp
@@ -172,6 +172,7 @@ class CM2Model {
         void SetAnimating(int32_t animating);
         void SetBoneSequence(uint32_t boneId, uint32_t sequenceId, uint32_t a4, uint32_t time, float a6, int32_t a7, int32_t a8);
         void SetBoneSequenceDeferred(uint16_t a2, M2Data* data, uint16_t boneIndex, uint32_t time, float a6, M2SequenceFallback fallback, int32_t a8, int32_t a9, int32_t a10);
+        void SetGeometryVisible(uint32_t start, uint32_t end, int32_t visible);
         void SetIndices();
         void SetLightingCallback(void (*lightingCallback)(CM2Model*, CM2Lighting*, void*), void* lightingArg);
         void SetLoadedCallback(void (*loadedCallback)(CM2Model*, void*), void* loadedArg);
@@ -185,6 +186,7 @@ class CM2Model {
         int32_t Sub8269C0(uint32_t boneId, uint16_t boneIndex);
         void Sub826E60(uint32_t* a2, uint32_t* a3);
         void UnlinkFromCallbackList();
+        void UnoptimizeVisibleGeometry();
         void UnsetBoneSequence(uint32_t boneId, int32_t a3, int32_t a4);
         void UpdateLoaded();
         void WaitForLoad(const char* a2);