From 77622566d71b14e68635dbd92084b1780f9ee35e Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Mon, 20 Oct 2025 16:50:40 -0500
Subject: [PATCH] feat(gx): add TextureCalcMipCount

---
 src/gx/Texture.cpp | 20 ++++++++++++++++++++
 src/gx/Texture.hpp |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/src/gx/Texture.cpp b/src/gx/Texture.cpp
index 4d7cf73..35b5653 100644
--- a/src/gx/Texture.cpp
+++ b/src/gx/Texture.cpp
@@ -856,6 +856,26 @@ void TextureCacheNewTexture(CTexture* texture, const CImVector& color) {
     // TODO
 }
 
+uint32_t TextureCalcMipCount(uint32_t width, uint32_t height) {
+    uint32_t count = 1;
+
+    while (width > 1 || height > 1) {
+        width /= 2;
+        if (width == 0) {
+            width = 1;
+        }
+
+        height /= 2;
+        if (height == 0) {
+            height = 1;
+        }
+
+        count++;
+    }
+
+    return count;
+}
+
 HTEXTURE TextureCreate(const char* fileName, CGxTexFlags texFlags, CStatus* status, int32_t createFlags) {
     STORM_ASSERT(fileName);
     STORM_ASSERT(*fileName);
diff --git a/src/gx/Texture.hpp b/src/gx/Texture.hpp
index cb68564..8fa25d1 100644
--- a/src/gx/Texture.hpp
+++ b/src/gx/Texture.hpp
@@ -55,6 +55,8 @@ void TextureCacheNewTexture(CTexture*, CGxTexFlags);
 
 void TextureCacheNewTexture(CTexture*, const CImVector&);
 
+uint32_t TextureCalcMipCount(uint32_t width, uint32_t height);
+
 HTEXTURE TextureCreate(const char*, CGxTexFlags, CStatus*, int32_t);
 
 HTEXTURE TextureCreate(uint32_t, uint32_t, EGxTexFormat, EGxTexFormat, CGxTexFlags, void*, void (*)(EGxTexCommand, uint32_t, uint32_t, uint32_t, uint32_t, void*, uint32_t&, const void*&), const char*, int32_t);