source/blender/draw/engines/eevee_next/eevee_hizbuffer.cc

@@ -19,7 +19,9 @@ void HiZBuffer::sync()
 {
   int2 render_extent = inst_.film.render_extent_get();
   /* Padding to avoid complexity during down-sampling and screen tracing. */
-  int2 hiz_extent = math::ceil_to_multiple(render_extent, int2(1u << (HIZ_MIP_COUNT - 1)));
+  int2 probe_extent = int2(inst_.reflection_probes.probe_render_extent());
+  int2 hiz_extent = math::ceil_to_multiple(math::max(render_extent, probe_extent),
+                                           int2(1u << (HIZ_MIP_COUNT - 1)));
   int2 dispatch_size = math::divide_ceil(hiz_extent, int2(HIZ_GROUP_SIZE));
 
   eGPUTextureUsage usage = GPU_TEXTURE_USAGE_SHADER_READ | GPU_TEXTURE_USAGE_SHADER_WRITE;

source/blender/draw/engines/eevee_next/eevee_reflection_probes.cc

@@ -140,6 +140,11 @@ eLightProbeResolution ReflectionProbeModule::reflection_probe_resolution() const
   return LIGHT_PROBE_RESOLUTION_2048;
 }
 
+int ReflectionProbeModule::probe_render_extent() const
+{
+  return instance_.scene->eevee.gi_cubemap_resolution / 2;
+}
+
 void ReflectionProbeModule::init()
 {
   if (!is_initialized) {

source/blender/draw/engines/eevee_next/eevee_reflection_probes.hh

@@ -243,6 +243,13 @@ class ReflectionProbeModule {
     return probes_tx_.width();
   }
 
+  /**
+   * Get the resolution of a single cubemap side when rendering probes.
+   *
+   * The cubemaps are rendered half size of the size of the octahedral texture.
+   */
+  int probe_render_extent() const;
+
   ReflectionProbeAtlasCoordinate world_atlas_coord_get() const;
 
  private: