Smoke: Port display to Workbench + object mode

This does not fix the smokesim. It only port the drawing method.

The Object mode engine is in charge of rendering the velocity debugging.

Things left to do:
- Flame rendering.
- Color Ramp coloring of volume data.
- View facing slicing (for now it's only doing sampling starting from the
  volume bounds which gives a squarish look)
- Add option to enable dithering (currently on by default.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_common.h b/source/blender/draw/intern/draw_common.h
index 6227130fb05..b4ae0600f02 100644
--- a/source/blender/draw/intern/draw_common.h
+++ b/source/blender/draw/intern/draw_common.h
@@ -138,6 +138,8 @@ struct DRWShadingGroup *shgroup_instance_bone_stick(struct DRWPass *pass);
 struct GPUShader *mpath_line_shader_get(void);
 struct GPUShader *mpath_points_shader_get(void);
 
+struct GPUShader *volume_velocity_shader_get(bool use_needle);
+
 int DRW_object_wire_theme_get(
         struct Object *ob, struct ViewLayer *view_layer, float **r_color);
 float *DRW_color_background_blend_get(int theme_id);