EEVEE: Lookdev: Add back lighting support

This does not include reference spheres rendering.

The approach is a bit different than before.
Now we use a `bNodeTree` to control the rendering of lookdev. This
generates a `GPUMaterial` that is stored per `Instance`. This way
rendering lookdev is just updating the temp light cache using this
material as world material. Removing the use of custom shader.

This introduces a small hack in order to bind the studiolight hdri after
the nodetree glsl parsing.

The background display however is still using a custom shader in order
to sample the world cubemap with different roughness.

The view space option of the studiolight is now faster by using a
transform before shading instead of rebaking the lightprobe constantly.
This should not have any particular impact on render time.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/draw/engines/eevee/eevee_shader.hh b/source/blender/draw/engines/eevee/eevee_shader.hh
index 707950cb54a..8a64155e34c 100644
--- a/source/blender/draw/engines/eevee/eevee_shader.hh
+++ b/source/blender/draw/engines/eevee/eevee_shader.hh
@@ -86,6 +86,8 @@ enum eShaderType {
   LIGHTPROBE_FILTER_DIFFUSE,
   LIGHTPROBE_FILTER_VISIBILITY,
 
+  LOOKDEV_BACKGROUND,
+
   MOTION_BLUR_GATHER,
   MOTION_BLUR_TILE_DILATE,
   MOTION_BLUR_TILE_FLATTEN,
@@ -129,6 +131,12 @@ class ShaderModule {
   GPUMaterial *world_shader_get(::World *blender_world,
                                 struct bNodeTree *nodetree,
                                 eMaterialDomain domain_type);
+  GPUMaterial *material_shader_get(const char *name,
+                                   ListBase &materials,
+                                   struct bNodeTree *nodetree,
+                                   eMaterialGeometry geometry_type,
+                                   eMaterialDomain domain_type,
+                                   bool is_lookdev);
 
   GPUShaderSource material_shader_code_generate(GPUMaterial *mat, const GPUCodegenOutput *codegen);