EEVEE: Replace octahedron reflection probe by cubemap array

We implement cubemap array support for EEVEE's lightcache reflection probes.
This removes stretched texels and bottom hemisphere seams artifacts caused
by the octahedral projection previously used.

This introduce versioning code for the lightcache which will discard any
lightcache version that is not compatible.

Differential Revision: https://developer.blender.org/D7066

2 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index 5122b1ea1ac..6a6cdd8f51c 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -166,6 +166,8 @@ struct GPUTexture *DRW_texture_create_cube(int w,
                                            eGPUTextureFormat format,
                                            DRWTextureFlag flags,
                                            const float *fpixels);
+struct GPUTexture *DRW_texture_create_cube_array(
+    int w, int d, eGPUTextureFormat format, DRWTextureFlag flags, const float *fpixels);
 
 void DRW_texture_ensure_fullscreen_2d(struct GPUTexture **tex,
                                       eGPUTextureFormat format,
diff --git a/source/blender/draw/intern/draw_manager_texture.c b/source/blender/draw/intern/draw_manager_texture.c
index c75299158a3..3f11fe9d11e 100644
--- a/source/blender/draw/intern/draw_manager_texture.c
+++ b/source/blender/draw/intern/draw_manager_texture.c
@@ -123,6 +123,15 @@ GPUTexture *DRW_texture_create_cube(int w,
   return tex;
 }
 
+GPUTexture *DRW_texture_create_cube_array(
+    int w, int d, eGPUTextureFormat format, DRWTextureFlag flags, const float *fpixels)
+{
+  GPUTexture *tex = GPU_texture_create_cube_array(w, d, format, fpixels, NULL);
+  drw_texture_set_parameters(tex, flags);
+
+  return tex;
+}
+
 GPUTexture *DRW_texture_pool_query_2d(int w,
                                       int h,
                                       eGPUTextureFormat format,