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, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/icons.c b/source/blender/blenkernel/intern/icons.c
index d8c3e260399..9c265814b8f 100644
--- a/source/blender/blenkernel/intern/icons.c
+++ b/source/blender/blenkernel/intern/icons.c
@@ -51,6 +51,8 @@
 
 #include "BLO_sys_types.h" // for intptr_t support
 
+#include "GPU_extensions.h"
+
 /* GLOBALS */
 
 static GHash *gIcons = NULL;
@@ -138,7 +140,10 @@ void BKE_previewimg_freefunc(void *link)
 				MEM_freeN(prv->rect[i]);
 				prv->rect[i] = NULL;
 			}
+			if (prv->gputexture[i])
+				GPU_texture_free(prv->gputexture[i]);
 		}
+		
 		MEM_freeN(prv);
 	}
 }
@@ -165,6 +170,7 @@ PreviewImage *BKE_previewimg_copy(PreviewImage *prv)
 			else {
 				prv_img->rect[i] = NULL;
 			}
+			prv_img->gputexture[i] = NULL;
 		}
 	}
 	return prv_img;