Eevee-next: Reflective Light Baking

This PR will work towards baking reflective light from light probes.

Noteworthy changes:

- Input cubemap now has a resolution that would not require mipmapping
  anymore. As the cubemap is smaller than the octahedral map the
  filtering would already remove any artifacts using less GPU memory.

@@ -300,2 +300,3 @@
-  capture_view.render();
+  capture_view.render_world();
   main_view.render();
+  /* Rendering of probes depends on main view resources. The rendered probes will be applied to the

@@ -301,1 +301,4 @@
   main_view.render();
+  /* Rendering of probes depends on main view resources. The rendered probes will be applied to the
+   * next sample. */
+  // TODO: Not sure how to incorporate this during image rendering.

@@ -254,3 +259,4 @@
       mat.prepass = material_pass_get(ob, blender_mat, prepass_pipe, geometry_type);
       mat.shading = material_pass_get(ob, blender_mat, surface_pipe, geometry_type);
       mat.capture = MaterialPass();
+      mat.probe_prepass = material_pass_get(

@@ -558,0 +569,4 @@
+      /* Textures. */
+      prepass_ps_.bind_texture(RBUFS_UTILITY_TEX_SLOT, inst_.pipelines.utility_tx);
+      /* Uniform Buffer. */
+      // TODO: should not be camera...

@@ -558,0 +646,4 @@
+    eval_light_ps_.bind_texture("gbuffer_closure_tx", &inst_.gbuffer.closure_tx);
+    eval_light_ps_.bind_texture("gbuffer_color_tx", &inst_.gbuffer.color_tx);
+    eval_light_ps_.push_constant("is_last_eval_pass", is_last_eval_pass);
+    // TODO bind dummy texture so they don't influence any render pass accumulation.

@@ -558,0 +659,4 @@
+    inst_.sampling.bind_resources(&eval_light_ps_);
+    inst_.hiz_buffer.bind_resources(&eval_light_ps_);
+    inst_.ambient_occlusion.bind_resources(&eval_light_ps_);
+    // TODO: only allow the world light to be evaluated

@@ -558,0 +723,4 @@
+void DeferredProbePipeline::begin_sync()
+{
+  opaque_layer_.begin_sync();
+  refraction_layer_.begin_sync();

@@ -213,0 +219,4 @@
+
+  PassMain prepass_ps_ = {"Prepass"};
+  PassMain::Sub *prepass_single_sided_static_ps_ = nullptr;
+  // PassMain::Sub *prepass_single_sided_moving_ps_ = nullptr;

@@ -213,0 +252,4 @@
+   * a hardcoded number of them. */
+  DeferredProbeLayer opaque_layer_;
+  DeferredProbeLayer refraction_layer_;
+  DeferredProbeLayer volumetric_layer_;

@@ -96,0 +106,4 @@
+   * Is set and reset during `remap_to_octahedral_projection`. All other occasions should contain
+   * nullptr.
+   */
+  GPUTexture *cubemap_tx_ = nullptr;

@@ -162,6 +162,19 @@ void Sampling::step()
   reset_ = false;
 }
 
+bool Sampling::do_probe_sync() const

@@ -223,0 +230,4 @@
+{
+  GPU_debug_capture_begin();
+  Texture cubemap_tx;
+  TextureFromPool depth_tx;

@@ -223,0 +244,4 @@
+
+    int2 extent = int2(update_info->resolution);
+
+    if (cubemap_tx.ensure_cube(GPU_RGBA16F, update_info->resolution, GPU_TEXTURE_USAGE_ATTACHMENT))