Add watermark driven discards.

Does a much better job of staying within the memory budget.

1 files changed, 14 insertions, 0 deletions

diff --git a/indra/llprimitive/lltextureentry.h b/indra/llprimitive/lltextureentry.h
index 78c61b4d65..765a5f5fdc 100644
--- a/indra/llprimitive/lltextureentry.h
+++ b/indra/llprimitive/lltextureentry.h
@@ -143,6 +143,13 @@ public:
     F32  getScaleS() const { return mScaleS; }
     F32  getScaleT() const { return mScaleT; }
 
+    // Cached min(|mScaleS|, |mScaleT|)^2, lazily computed and invalidated
+    // in setScale/setScaleS/setScaleT. Used by the texture streaming face
+    // loop (updateImageDecodePriority) to avoid the per-face per-frame
+    // sqrt/abs/min/multiply chain. Returns the raw (unclamped) value;
+    // callers still apply TextureScaleMin/MaxAreaFactor clamps.
+    F32  getMinScaleSq() const;
+
     void getOffset(F32 *s, F32 *t) const { *s = mOffsetS; *t = mOffsetT; }
     F32  getOffsetS() const { return mOffsetS; }
     F32  getOffsetT() const { return mOffsetT; }
@@ -218,6 +225,13 @@ public:
     F32                 mOffsetT;               // S, T offset
     F32                 mRotation;              // anti-clockwise rotation in rad about the bottom left corner
 
+private:
+    // Cache for getMinScaleSq(). -1.f sentinel = stale. Invalidated by
+    // setScale/setScaleS/setScaleT. Mutable so getMinScaleSq() can fill it
+    // on first read without breaking const correctness for read-only callers.
+    mutable F32 mMinScaleSq = -1.f;
+public:
+
     static const LLTextureEntry null;
 
     // LLSD key defines