EEVEE-Next: Reduce image bindings.

This change combines the diffuse/specular light passes into a single texture
array, freeing up an image binding for cryptomatte.

When diffuse/specular light pass and/or requested a
texture array will be allocated. Only when specular light is requested 2 images will always be allocated. This increases the
memory overhead when viewing the specular light renderpass in the viewport. For final rendering it is a common scenario that none
or both are requested.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D15701

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/draw/engines/eevee_next/eevee_shader_shared.hh b/source/blender/draw/engines/eevee_next/eevee_shader_shared.hh
index 3facb904a57..a0829bc49aa 100644
--- a/source/blender/draw/engines/eevee_next/eevee_shader_shared.hh
+++ b/source/blender/draw/engines/eevee_next/eevee_shader_shared.hh
@@ -292,6 +292,17 @@ static inline float film_filter_weight(float filter_radius, float sample_distanc
 /** \} */
 
 /* -------------------------------------------------------------------- */
+/** \name Render passes
+ * \{ */
+
+enum eRenderPassLayerIndex : uint32_t {
+  RENDER_PASS_LAYER_DIFFUSE_LIGHT = 0u,
+  RENDER_PASS_LAYER_SPECULAR_LIGHT = 1u,
+};
+
+/** \} */
+
+/* -------------------------------------------------------------------- */
 /** \name Arbitrary Output Variables
  * \{ */