Matcap support in 3D Viewport.

Full log is here:
http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.66/Usability#Matcap_in_3D_viewport

Implementation notes:

- Matcaps are an extension of Solid draw mode, and don't show in other drawmodes.
  (It's mostly intended to aid modeling/sculpt)

- By design, Matcaps are a UI feature, and only stored locally for the UI itself, and
  won't affect rendering or materials.

- Currently a set of 16 (GPL licensed) Matcaps have been compiled into Blender. 
  It doesn't take memory or cpu time, until you use it.

- Brush Icons and Matcaps use same code now, and only get generated/allocated on
  actually using it (instead of on startup).

- The current set might get new or different images still, based on user feedback.

- Matcap images are 512x512 pixels, so each image takes 1 Mb memory. Unused matcaps get 
  freed immediately. The Matcap icon previews (128x128 pixels) stay in memory.

- Loading own matcap image files will be added later. That needs design and code work 
  to get it stable and memory-friendly.

- The GLSL code uses the ID PreviewImage for matcaps. I tested it using the existing
  Material previews, which has its limits... especially for textured previews the
  normal-mapped matcap won't look good.

1 files changed, 15 insertions, 2 deletions

diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 09bf029154c..b2d58cf41de 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -32,6 +32,7 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "DNA_material_types.h"
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 
@@ -42,16 +43,18 @@
 #include "BLI_rand.h"
 #include "BLI_utildefines.h"
 
-#include "BKE_object.h"
 #include "BKE_context.h"
+#include "BKE_icons.h"
+#include "BKE_object.h"
 #include "BKE_screen.h"
 
 #include "ED_space_api.h"
 #include "ED_screen.h"
 #include "ED_object.h"
 
-#include "BIF_gl.h"
+#include "GPU_material.h"
 
+#include "BIF_gl.h"
 
 #include "WM_api.h"
 #include "WM_types.h"
@@ -335,6 +338,14 @@ static void view3d_free(SpaceLink *sl)
 	if (vd->localvd) MEM_freeN(vd->localvd);
 	
 	if (vd->properties_storage) MEM_freeN(vd->properties_storage);
+	
+	/* matcap material, its preview rect gets freed via icons */
+	if (vd->defmaterial) {
+		if (vd->defmaterial->gpumaterial.first)
+			GPU_material_free(vd->defmaterial);
+		BKE_previewimg_free(&vd->defmaterial->preview);
+		MEM_freeN(vd->defmaterial);
+	}
 }
 
 
@@ -365,6 +376,8 @@ static SpaceLink *view3d_duplicate(SpaceLink *sl)
 	
 	/* copy or clear inside new stuff */
 
+	v3dn->defmaterial = NULL;
+	
 	BLI_duplicatelist(&v3dn->bgpicbase, &v3do->bgpicbase);
 
 	v3dn->properties_storage = NULL;