Gawain: tweak immediate mode API

Should be simpler to use now.

Made vertex format structure private. New immVertexFormat() function
clears and returns the format. Devs can start with add_attrib(format...)
and not have to clear it first.

immBindProgram automatically packs the vertex format if needed.

Updated 3D cursor drawing to use new API.

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/gpu/GPU_immediate.h b/source/blender/gpu/GPU_immediate.h
index 1373faa236b..0ee97349970 100644
--- a/source/blender/gpu/GPU_immediate.h
+++ b/source/blender/gpu/GPU_immediate.h
@@ -53,11 +53,13 @@ void pack(VertexFormat*);
 // unsigned attrib_idx(const VertexFormat*, const char* name);
 void bind_attrib_locations(const VertexFormat*, GLuint program);
 
-extern PER_THREAD VertexFormat immVertexFormat; // so we don't have to copy or pass around
+// --- immediate mode work-alike --------------------------------
 
 void immInit(void);
 void immDestroy(void);
 
+VertexFormat* immVertexFormat(void); // returns a cleared vertex format, ready for add_attrib
+
 void immBindProgram(GLuint program);
 void immUnbindProgram(void);