diff --git a/src/refresh/vkpt/shader/god_rays.comp b/src/refresh/vkpt/shader/god_rays.comp
index dd480e3..ae6e940 100644
--- a/src/refresh/vkpt/shader/god_rays.comp
+++ b/src/refresh/vkpt/shader/god_rays.comp
@@ -47,17 +47,46 @@
 #include "water.glsl"
-
-float GetShadow(vec3 worldPos, out float distanceToWater)
-{
-	vec4 uvzShadow = global_ubo.shadow_map_VP * vec4(worldPos, 1);
-	uvzShadow.x = uvzShadow.x * 0.5 + 0.5;
-	uvzShadow.y = 0.5 - 0.5 * uvzShadow.y;
-
-	float depthOpaque = textureLod(TEX_SHADOW_MAP, vec3(uvzShadow.xy, 0), 0).x;
-	float depthWater = textureLod(TEX_SHADOW_MAP, vec3(uvzShadow.xy, 1), 0).x;
-
-	distanceToWater = max(0, uvzShadow.z - depthWater) * global_ubo.shadow_map_depth_scale;
-
-	return depthOpaque > uvzShadow.z ? 1 : 0;
-}
-
+
+float FetchShadowDepth(ivec2 texel, int layer, ivec2 size)
+{
+	if(any(lessThan(texel, ivec2(0))) || any(greaterThanEqual(texel, size)))
+	{
+		// Match VK_BORDER_COLOR_FLOAT_OPAQUE_WHITE outside the shadow map.
+		return 1.0;
+	}
+
+	return texelFetch(TEX_SHADOW_MAP, ivec3(texel, layer), 0).x;
+}
+
+float SampleShadowMin(vec2 uv, int layer)
+{
+	ivec2 size = ivec2(SHADOWMAP_SIZE);
+	vec2 position = uv * vec2(size) - vec2(0.5);
+	ivec2 base = ivec2(floor(position));
+	vec2 fraction = fract(position);
+
+	float depth = FetchShadowDepth(base, layer, size);
+	if(fraction.x > 0.0)
+		depth = min(depth, FetchShadowDepth(base + ivec2(1, 0), layer, size));
+	if(fraction.y > 0.0)
+		depth = min(depth, FetchShadowDepth(base + ivec2(0, 1), layer, size));
+	if(fraction.x > 0.0 && fraction.y > 0.0)
+		depth = min(depth, FetchShadowDepth(base + ivec2(1, 1), layer, size));
+
+	return depth;
+}
+
+float GetShadow(vec3 worldPos, out float distanceToWater)
+{
+	vec4 uvzShadow = global_ubo.shadow_map_VP * vec4(worldPos, 1);
+	uvzShadow.x = uvzShadow.x * 0.5 + 0.5;
+	uvzShadow.y = 0.5 - 0.5 * uvzShadow.y;
+
+	float depthOpaque = SampleShadowMin(uvzShadow.xy, 0);
+	float depthWater = SampleShadowMin(uvzShadow.xy, 1);
+
+	distanceToWater = max(0, uvzShadow.z - depthWater) * global_ubo.shadow_map_depth_scale;
+
+	return depthOpaque > uvzShadow.z ? 1 : 0;
+}
+
 float rand(ivec2 pos)