fix max lod level computation in IBLPrefilter

FIXES=[308012116]
google · Oct 27, 2023 · cfd851e · cfd851e
1 parent 2b86c8d
commit cfd851e
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/filament/src/details/Texture.h b/filament/src/details/Texture.h
@@ -104,7 +104,7 @@ class FTexture : public Texture {
 
     // Returns the max number of levels for a texture of given dimensions
     static inline uint8_t maxLevelCount(uint32_t width, uint32_t height) noexcept {
-        uint32_t maxDimension = std::max(width, height);
+        uint32_t const maxDimension = std::max(width, height);
         return maxLevelCount(maxDimension);
     }
 

diff --git a/libs/iblprefilter/src/IBLPrefilterContext.cpp b/libs/iblprefilter/src/IBLPrefilterContext.cpp
@@ -217,7 +217,7 @@ Texture* IBLPrefilterContext::EquirectangularToCubemap::operator()(
             "equirect must be a 2D texture.");
 
     UTILS_UNUSED_IN_RELEASE
-    const uint8_t maxLevelCount = uint8_t(std::log2(equirect->getWidth()) + 0.5f) + 1u;
+    const uint8_t maxLevelCount = std::max(1, std::ilogbf(float(equirect->getWidth())) + 1);
 
     ASSERT_PRECONDITION(equirect->getLevels() == maxLevelCount,
             "equirect must have %u mipmap levels allocated.", +maxLevelCount);