Allow generic vertex attribute 0, since OpenGL 3.0 does not support any fixed-functio...

Blender exporter: support exporting tangent/binormal vectors for bump mapping

diff --git a/mesh_export.py b/mesh_export.py
index 7d21956a6cd1d14bab49c27161f2757c3b60ddd9..41ceb90a7baed794eaf7fa1cf6cc6d0276efb5e2 100644 (file)
--- a/mesh_export.py
+++ b/mesh_export.py
@@ -20,6 +20,8 @@ class Edge:
        def __init__(self, me):
                if me.__class__==Edge:
                        self._medge=me._medge
+                       self.v1=me.v1
+                       self.v2=me.v2
                        self.smooth=me.smooth
                else:
                        self._medge=me
@@ -54,6 +56,7 @@ class Vertex:
        def __init__(self, mv):
                if mv.__class__==Vertex:
                        self._mvert=mv._mvert
+                       self.no=mv.no
                        self.uv=mv.uv
                else:
                        self._mvert=mv
@@ -61,6 +64,8 @@ class Vertex:
                self.orig_index=self._mvert.index
                self.flag=False
                self.faces=[]
+               self.tan=None
+               self.bino=None
 
        def __getattr__(self, attr):
                return getattr(self._mvert, attr)
@@ -96,7 +101,7 @@ class Face:
        
        __repr__=__str__
 
-       def get_vertices_from(self, reverse, *vt):
+       def pivot_vertices(self, reverse, *vt):
                verts=self.verts[:]
                if reverse:
                        verts.reverse()
@@ -111,6 +116,7 @@ class Face:
                for e in self.edges:
                        if e.key==key:
                                return e
+               raise KeyError, "No edge %s"%(key,)
 
 
 class Line:
@@ -180,7 +186,7 @@ class Mesh:
                                self.verts.append(v)
 
                                if debug:
-                                       print "  -> %d"%v.index
+                                       print "  -> %d %s"%(v.index, [f.index for f in g])
 
                                for f in g:
                                        for j in range(len(f.edges)):
@@ -263,6 +269,26 @@ class Mesh:
                        if v.faces:
                                v.uv=v.faces[0].uv[v.faces[0].verts.index(v)]
 
+       def compute_tbn(self):
+               for v in self.verts:
+                       v.tan=Blender.Mathutils.Vector()
+                       v.bino=Blender.Mathutils.Vector()
+                       for f in v.faces:
+                               fverts=f.pivot_vertices(False, v)
+                               v1=fverts[1]
+                               v2=fverts[-1]
+                               du1=v1.uv[0]-v.uv[0]
+                               du2=v2.uv[0]-v.uv[0]
+                               dv1=v1.uv[1]-v.uv[1]
+                               dv2=v2.uv[1]-v.uv[1]
+                               div=du1*dv2-du2*dv1
+                               edge1=fverts[1].co-fverts[0].co
+                               edge2=fverts[-1].co-fverts[0].co
+                               v.tan+=(edge1*dv2-edge2*dv1)/div
+                               v.bino+=(edge2*du1-edge1*du2)/div
+                       v.tan.normalize()
+                       v.bino.normalize()
+
        def create_strip(self, face, reverse, debug):
                edge=None
                for e in face.edges:
@@ -277,14 +303,14 @@ class Mesh:
                if debug:
                        print "Starting strip from %s, edge %s, reverse=%s"%([v.index for v in face.verts], (edge.v1.index, edge.v2.index), reverse)
 
-               verts=face.get_vertices_from(reverse, edge.v1, edge.v2)
+               verts=face.pivot_vertices(reverse, edge.v1, edge.v2)
                if len(verts)==3:
                        result=[verts[-1], verts[0]]
                else:
                        result=[verts[-2], verts[-1]]
 
                while 1:
-                       verts=face.get_vertices_from(reverse, *result[-2:])
+                       verts=face.pivot_vertices(reverse, *result[-2:])
                        k=len(result)%2
                        if debug:
                                print "  Adding %s"%face
@@ -323,6 +349,7 @@ class Exporter:
                self.use_degen_tris=True
                self.optimize_locality=True
                self.export_lines=True
+               self.tbn_vecs=False
                self.debug=False
                self.strip_debug=False
                self.split_debug=False
@@ -374,6 +401,8 @@ class Exporter:
                                print "After UV splitting %d vertices and %d edges"%(len(mesh.verts), len(mesh.edges))
 
                        mesh.compute_uv()
+                       if self.tbn_vecs:
+                               mesh.compute_tbn()
 
                strips=[]
                if self.use_strips:
@@ -479,9 +508,13 @@ class Exporter:
                self.out_file.write("vertices NORMAL3")
                if mesh.faceUV:
                        self.out_file.write("_TEXCOORD2")
+                       if self.tbn_vecs:
+                               self.out_file.write("_ATTRIB33_ATTRIB34")
                self.out_file.write("_VERTEX3\n{\n")
                norm=None
                uv=None
+               tan=None
+               bino=None
                for v in mesh.verts:
                        if v.no!=norm:
                                self.out_file.write("\tnormal3 %f %f %f;\n"%tuple(v.no))
@@ -489,6 +522,12 @@ class Exporter:
                        if v.uv!=uv:
                                self.out_file.write("\ttexcoord2 %f %f;\n"%tuple(v.uv))
                                uv=v.uv
+                       if v.tan!=tan:
+                               self.out_file.write("\tattrib3 3 %f %f %f;\n"%tuple(v.tan))
+                               tan=v.tan
+                       if v.bino!=bino:
+                               self.out_file.write("\tattrib3 4 %f %f %f;\n"%tuple(v.bino))
+                               bino=v.bino
                        self.out_file.write("\tvertex3 %f %f %f;\n"%tuple(v.co))
                self.out_file.write("};\n")
                for s in strips:
@@ -529,6 +568,7 @@ class FrontEnd:
                self.use_degen_tris=Blender.Draw.Create(self.config.get('use_degen_tris', True))
                self.optimize_locality=Blender.Draw.Create(self.config.get('optimize_locality', True))
                self.export_lines=Blender.Draw.Create(self.config.get('export_lines', False))
+               self.tbn_vecs=Blender.Draw.Create(self.config.get('tbn_vecs', False))
                self.debug=Blender.Draw.Create(self.config.get('debug', False))
                self.strip_debug=Blender.Draw.Create(self.config.get('strip_debug', False))
                self.split_debug=Blender.Draw.Create(self.config.get('split_debug', False))
@@ -536,7 +576,8 @@ class FrontEnd:
                        [("Use strips", self.use_strips, "Generage OpenGL triangle strips"),
                                ("Use degen tris", self.use_degen_tris, "Use degenerate triangles to combine triangle strips"),
                                ("Optimize locality", self.optimize_locality),
-                               ("Export lines", self.export_lines),
+                               ("Export lines", self.export_lines, "Export lone edges as lines"),
+                               ("Compute T/B vecs", self.tbn_vecs, "Compute tangent/binormal vectors for bumpmapping"),
                                ("Debugging options"),
                                ("Debug", self.debug),
                                ("Debug strips", self.strip_debug),
@@ -554,6 +595,7 @@ class FrontEnd:
                self.config['use_degen_tris']=self.use_degen_tris.val
                self.config['optimize_locality']=self.optimize_locality.val
                self.config['export_lines']=self.export_lines.val
+               self.config['tbn_vecs']=self.tbn_vecs.val
                self.config['debug']=self.debug.val
                self.config['strip_debug']=self.strip_debug.val
                self.config['split_debug']=self.split_debug.val
@@ -568,6 +610,7 @@ class FrontEnd:
                exp.use_degen_tris=self.use_degen_tris.val
                exp.optimize_locality=self.optimize_locality.val
                exp.export_lines=self.export_lines.val
+               exp.tbn_vecs=self.tbn_vecs.val
                exp.debug=self.debug.val
                exp.strip_debug=self.strip_debug.val
                exp.split_debug=self.split_debug.val

diff --git a/source/vertexarray.cpp b/source/vertexarray.cpp
index de343bf7065a07aa573377a6e49be8114dd60356..ef11844466b9ff7833dcde88a53a69ff422f059d 100644 (file)
--- a/source/vertexarray.cpp
+++ b/source/vertexarray.cpp
@@ -1,7 +1,7 @@
 /* $Id$
 
 This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
+Copyright © 2007-2009  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
@@ -108,7 +108,7 @@ void VertexArray::apply() const
                                glColorPointer(sz, GL_FLOAT, bpv, base+offset);
                        break;
                default:
-                       glVertexAttribPointerARB(t-3, sz, GL_FLOAT, false, bpv, base+offset);
+                       glVertexAttribPointerARB(t-4, sz, GL_FLOAT, false, bpv, base+offset);
                        break;
                }
                found|=1<<t;

diff --git a/source/vertexarraybuilder.cpp b/source/vertexarraybuilder.cpp
index 8e7e2cb5dd4433625747545cea073fee6715e89c..09b0a1f2a85655e21e3f87b15525a7f8ac87d756 100644 (file)
--- a/source/vertexarraybuilder.cpp
+++ b/source/vertexarraybuilder.cpp
@@ -1,7 +1,7 @@
 /* $Id$
 
 This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
+Copyright © 2007-2009  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
@@ -26,7 +26,8 @@ void VertexArrayBuilder::vertex_(float x, float y, float z, float w)
        for(const unsigned char *c=array.get_format().begin(); c!=array.get_format().end(); ++c)
        {
                uint size=(*c&3)+1;
-               switch(*c>>2)
+               uint type=*c>>2;
+               switch(type)
                {
                case 0:
                        *ptr++=x;
@@ -64,7 +65,7 @@ void VertexArrayBuilder::vertex_(float x, float y, float z, float w)
                        }
                        break;
                default:
-                       const Attrib &a=av[(*c>>2)-4];
+                       const Attrib &a=av[type-4];
                        *ptr++=a.x;
                        if(size>=2) *ptr++=a.y;
                        if(size>=3) *ptr++=a.z;

diff --git a/source/vertexformat.cpp b/source/vertexformat.cpp
index 232690ede2f99f2c7d1ebb8411d9ad442c68dffa..91084bcc273e0bff6524746b22372a10d7b88eee 100644 (file)
--- a/source/vertexformat.cpp
+++ b/source/vertexformat.cpp
@@ -1,7 +1,7 @@
 /* $Id$
 
 This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
+Copyright © 2007-2009  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
@@ -87,9 +87,9 @@ VertexFormat operator,(const VertexFormat &f, unsigned i)
        if(*c<ATTRIB1)
                throw InvalidState("Last component is not a generic attribute");
        // VertexArray uses an unsigned to store flags for enabled arrays
-       if(i<1 || i>28)
+       if(i>=28)
                throw InvalidParameterValue("Generic attribute index out of range");
-       *c+=(i-1)*4;
+       *c+=i*4;
 
        return r;
 }