From 53d81367b1b64c3d7966980c14c18634acad1911 Mon Sep 17 00:00:00 2001
From: Christopher Bruns <cmbruns@rotatingpenguin.com>
Date: Thu, 20 Jun 2024 10:28:04 -0700
Subject: [PATCH] Only use catrom at finest mipmap level. Reduce minimum zoom
 level to 0.45.

---
 vmg/shared.frag | 4 +++-
 vmg/state.py    | 4 ++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/vmg/shared.frag b/vmg/shared.frag
index 2e6810a..8087663 100644
--- a/vmg/shared.frag
+++ b/vmg/shared.frag
@@ -83,7 +83,9 @@ vec4 clip_n_filter(sampler2D image, vec2 tc, int pixelFilter, bool wrap)
         return vec4(0);
     }
 
-    if (pixelFilter == FILTER_NEAREST) {
+    float mipmapLevel = textureQueryLod(image, tc).x;
+    if (mipmapLevel > 0 || pixelFilter == FILTER_NEAREST)
+    {
         if (wrap)
            return nearest_wrap(image, tc);
         else
diff --git a/vmg/state.py b/vmg/state.py
index 6957518..e91f256 100644
--- a/vmg/state.py
+++ b/vmg/state.py
@@ -463,8 +463,8 @@ def zoom_relative(self, zoom_factor: float, zoom_center: Optional[QPoint]):
         old_zoom = self._zoom
         new_zoom = self._zoom * zoom_factor
         # Limit zoom-out because you never need more than twice the image dimension to move around
-        if new_zoom <= 1:
-            new_zoom = 1
+        if new_zoom <= 0.45:
+            new_zoom = 0.45
         self._zoom = new_zoom
         if zoom_center is not None:
             p_qwn = LocationQwn(zoom_center.x(), zoom_center.y(), 1)