Decompile fn_10103 (SpriteDrawingPolicy::OffsetLayerDepth)

Batch #1871 by Yommy: 0 byte-identical, 1 confirmed by peer review.

- fn_10103 SpriteDrawingPolicy::OffsetLayerDepth: logic confirmed by peer review

Reviewed-by: ragnarok-clanker
Adds to the build: Source/Contents/SpriteLayerDepth.cpp

Source/Contents/Actors/SpriteDrawingPolicy.h

@@ -24,6 +24,7 @@ struct SpriteDrawingPolicy {
     int unused, int layer, float scale, const SpriteFrameCell& cell, float x, float y, const float* position, float shift, float& bottomDepth,
     float& topDepth, const SpriteRleImage& image, SpriteCellQuad& quad, tagRECT& bounds, SpriteColor& color, int offsetX, int offsetY, int flags
   ) const;
+  void OffsetLayerDepth(int layer, SpriteCellQuad& quad, float bottomDepth, float topDepth) const;
 };
 
 #endif

Source/Contents/Camera/Camera.h

@@ -8,6 +8,8 @@
 
 struct WorldScene;
 
+extern float g_cameraDistance;
+
 class CView {
 public:
   /* 0000 */ void* vtable;

Source/Contents/SpriteLayerDepth.cpp

@@ -0,0 +1,41 @@
+#include "Contents/Actors/SpriteDrawingPolicy.h"
+#include "Contents/Camera/Camera.h"
+#include "Render/SpriteGeometry.h"
+
+constexpr float robeTopLayerThreshold = 320.0f;
+
+// GLOBAL: gl_24739
+float g_cameraDistance = 300.0f;
+
+// OFFSET: 0x0080DAA0
+// FUNCTION: fn_10103
+void SpriteDrawingPolicy::OffsetLayerDepth(int layer, SpriteCellQuad& quad, float bottomDepth, float topDepth) const {
+  switch (layer) {
+  case 2:
+    if (g_cameraDistance < robeTopLayerThreshold) {
+      quad.bottomDepth = bottomDepth + 0.000027f;
+      quad.topDepth = topDepth + 0.000027f;
+    } else {
+      quad.bottomDepth = bottomDepth;
+      quad.topDepth = topDepth;
+    }
+    break;
+  case 3:
+    if (g_cameraDistance < robeTopLayerThreshold) {
+      quad.bottomDepth = bottomDepth + 0.00004f;
+      quad.topDepth = 0.0001f + topDepth;
+    } else {
+      quad.bottomDepth = bottomDepth;
+      quad.topDepth = 0.000045f + topDepth;
+    }
+    break;
+  case 4:
+    if (g_cameraDistance < robeTopLayerThreshold) {
+      bottomDepth += 0.00003f;
+      topDepth += 0.00003f;
+    }
+    quad.bottomDepth = bottomDepth;
+    quad.topDepth = topDepth;
+    break;
+  }
+}

data/compile.json

@@ -428,6 +428,7 @@
   "Source/Contents/Sound/SoundMgr.cpp": 4,
   "Source/Contents/SpriteFrameSynchronization.cpp": 4,
   "Source/Contents/SpriteJob.cpp": 4,
+  "Source/Contents/SpriteLayerDepth.cpp": 4,
   "Source/Contents/SpriteLayerOrder.cpp": 4,
   "Source/Contents/SpriteRidingPolicy.cpp": 4,
   "Source/Contents/Store/MCStoreInfoBackup.cpp": 4,