Fix: EEVEE: Light: Invalid read in Shadow Setup shader

This happened in scenes with high light count and
with some local light being culled.

The culled lights indices would still be processed
and load undefined data. This undefined data
might be interpreted as a sunlight and go into
the cascade setup loop with an undefined number
of levels.

This created loops of 1 billion iteration per thread
which triggered the TDR on windows.

The fix is to skip the culled light indices.

Fixes #123413
Fixes #123190

source/blender/draw/engines/eevee_next/shaders/eevee_light_shadow_setup_comp.glsl

@@ -252,7 +252,14 @@ void cubeface_sync(int tilemap_id,
 void main()
 {
   uint l_idx = gl_GlobalInvocationID.x;
-  if (l_idx >= light_cull_buf.items_count) {
+  /* We are dispatching (with padding) over the culled light array.
+   * This array is not contiguous. Visible local lights are packed at the begining
+   * and directional lights at the end. There is a range of uninitialized value in between that
+   * needs to be avoided. */
+  bool valid_local = (l_idx < light_cull_buf.visible_count);
+  bool valid_directional = (l_idx >= light_cull_buf.local_lights_len) &&
+                           (l_idx < light_cull_buf.items_count);
+  if (!valid_local || !valid_directional) {
     return;
   }