From 3e3d18512ed48a2016cbca562ffc5c556b3a81c4 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Thu, 12 Nov 2026 09:46:21 +0000
Subject: [PATCH] Decompile fn_01727 (SampleModelTexture)

Batch #18030 by eAthena: 0 byte-identical, 1 confirmed by peer review.

- fn_01727 SampleModelTexture: logic confirmed by peer review

Peer-reviewed-by: Yommy, KWDev, bibinir
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 Source/Contents/Models/ModelNode.h            |  2 +-
 .../Contents/Models/ModelTextureAnimation.cpp | 38 +++++++++----------
 2 files changed, 18 insertions(+), 22 deletions(-)

diff --git a/Source/Contents/Models/ModelNode.h b/Source/Contents/Models/ModelNode.h
index 0f81720a3..409be9ce8 100644
--- a/Source/Contents/Models/ModelNode.h
+++ b/Source/Contents/Models/ModelNode.h
@@ -12,7 +12,7 @@ struct ModelTextureTransform {
   /* 0000 */ float values[5] = {0, 0, 1, 1, 0};
 };
 
-void SampleModelTexture(const ModelTextureChannels& channels, float frame, ModelTextureTransform& output);
+void SampleModelTexture(ModelTextureChannels& channels, float frame, ModelTextureTransform& output);
 
 class C3dNode {
 public:
diff --git a/Source/Contents/Models/ModelTextureAnimation.cpp b/Source/Contents/Models/ModelTextureAnimation.cpp
index 54cc6d758..c9aaea08f 100644
--- a/Source/Contents/Models/ModelTextureAnimation.cpp
+++ b/Source/Contents/Models/ModelTextureAnimation.cpp
@@ -3,34 +3,30 @@
 
 // OFFSET: 0x00540EA0
 // FUNCTION: fn_01727
-void SampleModelTexture(const ModelTextureChannels& channels, float frame, ModelTextureTransform& output) {
+void SampleModelTexture(ModelTextureChannels& channels, float frame, ModelTextureTransform& output) {
+  float* targets[5] = {&output.values[0], &output.values[1], &output.values[2], &output.values[3], &output.values[4]};
+
   for (int channel = 0; channel < 5; ++channel) {
-    const auto found = channels.find(channel);
-
-    if (found == channels.end()) {
-      continue;
-    }
-
-    const auto& keys = found->second;
-    const int last = keys.back().frame;
-
-    if (frame >= static_cast<float>(last)) {
-      output.values[channel] = keys.back().value;
+    if (channels.find(channel) == channels.end()) {
       continue;
     }
 
+    std::vector<ModelTextureKey>& keys = channels[channel];
     unsigned next = 1;
+    if (frame < static_cast<float>(keys.back().frame)) {
+      const unsigned count = keys.size();
+      for (; next < count; ++next) {
+        if (frame < static_cast<float>(keys[next].frame)) {
+          break;
+        }
+      }
 
-    while (next < keys.size() && !(static_cast<float>(keys[next].frame) > frame)) {
-      ++next;
+      const int previous = keys[next - 1].frame;
+      const float amount = (frame - static_cast<float>(previous)) / static_cast<float>(keys[next].frame - previous);
+      *targets[channel] = (1.0f - amount) * keys[next - 1].value + amount * keys[next].value;
+    } else {
+      *targets[channel] = keys.back().value;
     }
-
-    const int previous = keys[next - 1].frame;
-    const int difference = keys[next].frame - keys[next - 1].frame;
-    const float amount = (frame - static_cast<float>(previous)) / static_cast<float>(difference);
-    const float first = (1.0f - amount) * keys[next - 1].value;
-    const float second = amount * keys[next].value;
-    output.values[channel] = first + second;
   }
 }