World space switch for BI nodes.

At the moment light shading in Blender is produced in viewspace. Apparently, that's why
shader nodes work with normals in camera space. But it is not convenient for artists.
The more convenient approach is implemented in Cycles where normals are represented in world space.
Blend4Web Team designed the engine keeping in mind shader parameters readability,
so normals are interpreted in world space as well. And now our users have to use some tweaks, like
empty node group with the name "Replace", which is replacing one input by another on the engine side
(replacing working configuration in Blender Viewport by the configuration that has the same behavior in the engine).

This patch adds the ability to switch to world space for normals and lamp vector in BI and Viewport.
This patch is very important to us and we crave to see this patch in Blender 2.7 because
it will significantly simplify Blend4Web material creation workflow.

{F315547}

{F315548}

Reviewers: campbellbarton, brecht

Reviewed By: brecht

Subscribers: homyachetser, Evgeny_Rodygin, AlexKowel, yurikovelenov

Differential Revision: https://developer.blender.org/D2046

2 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_material.h b/source/blender/gpu/GPU_material.h
index fc2ca16db59..a79334df8ce 100644
--- a/source/blender/gpu/GPU_material.h
+++ b/source/blender/gpu/GPU_material.h
@@ -241,6 +241,7 @@ void GPU_material_vertex_attributes(GPUMaterial *material,
 
 bool GPU_material_do_color_management(GPUMaterial *mat);
 bool GPU_material_use_new_shading_nodes(GPUMaterial *mat);
+bool GPU_material_use_world_space_shading(GPUMaterial *mat);
 
 /* Exported shading */
 
diff --git a/source/blender/gpu/intern/gpu_material.c b/source/blender/gpu/intern/gpu_material.c
index 99ecf687f70..02f58ea6df2 100644
--- a/source/blender/gpu/intern/gpu_material.c
+++ b/source/blender/gpu/intern/gpu_material.c
@@ -517,6 +517,11 @@ bool GPU_material_use_new_shading_nodes(GPUMaterial *mat)
 	return BKE_scene_use_new_shading_nodes(mat->scene);
 }
 
+bool GPU_material_use_world_space_shading(GPUMaterial *mat)
+{
+	return BKE_scene_use_world_space_shading(mat->scene);
+}
+
 static GPUNodeLink *lamp_get_visibility(GPUMaterial *mat, GPULamp *lamp, GPUNodeLink **lv, GPUNodeLink **dist)
 {
 	GPUNodeLink *visifac;