EEVEE: GLSL refactor/cleanup

- add the use of DRWShaderLibrary to EEVEE's glsl codebase to reduce code
complexity and duplication.
- split bsdf_common_lib.glsl into multiple sub library which are now shared
with other engines.
- the surface shader code is now more organised and have its own files.
- change default world to use a material nodetree and make lookdev shader
more clear.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D8306

1 files changed, 6 insertions, 2 deletions

diff --git a/source/blender/gpu/intern/gpu_material.c b/source/blender/gpu/intern/gpu_material.c
index c65c1046b8f..8e98d1934d4 100644
--- a/source/blender/gpu/intern/gpu_material.c
+++ b/source/blender/gpu/intern/gpu_material.c
@@ -85,7 +85,7 @@ struct GPUMaterial {
   bool has_surface_output;
 
   /* Only used by Eevee to know which bsdf are used. */
-  int flag;
+  eGPUMatFlag flag;
 
   /* Used by 2.8 pipeline */
   GPUUniformBuffer *ubo; /* UBOs for shader uniforms. */
@@ -659,7 +659,8 @@ GPUMaterial *GPU_material_from_nodetree(Scene *scene,
                                         const char *geom_code,
                                         const char *frag_lib,
                                         const char *defines,
-                                        const char *name)
+                                        const char *name,
+                                        GPUMaterialEvalCallbackFn *callback)
 {
   LinkData *link;
   bool has_volume_output, has_surface_output;
@@ -696,6 +697,9 @@ GPUMaterial *GPU_material_from_nodetree(Scene *scene,
   mat->has_volume_output = has_volume_output;
 
   if (mat->graph.outlink) {
+    if (callback) {
+      callback(mat, options, &vert_code, &geom_code, &frag_lib, &defines);
+    }
     /* HACK: this is only for eevee. We add the define here after the nodetree evaluation. */
     if (GPU_material_flag_get(mat, GPU_MATFLAG_SSS)) {
       defines = BLI_string_joinN(defines,