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[diderot] Diff of /branches/pure-cfg/TODO
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Diff of /branches/pure-cfg/TODO

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revision 900, Wed Apr 20 18:23:24 2011 UTC revision 950, Fri Apr 22 19:27:39 2011 UTC
# Line 2  Line 2 
2  SHORT TERM =============  (for curvature-based VR)  SHORT TERM =============  (for curvature-based VR)
3  ========================  ========================
4    
 vector fields: convolution on vector images  
     (image orientation not quite working)  
   
5  IL support for higher-order tensor values (matrices, etc).  IL support for higher-order tensor values (matrices, etc).
6      tensor construction [DONE]      tensor construction [DONE]
7      tensor indexing [DONE]      tensor indexing [DONE]
# Line 48  Line 45 
45  other SHORT TERM =============  (including needed for LIC)  other SHORT TERM =============  (including needed for LIC)
46  ==============================  ==============================
47    
48    test/uninit.diderot:
49    documents need for better compiler error messages when output variables
50    are not initialized; the current messages are very cryptic
51    
52  determinant ("det") for tensor[3,3]  determinant ("det") for tensor[3,3]
53    
54  extend norm (|exp|) to all tensor types [DONE for vectors and matrices]  extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
# Line 64  Line 65 
65  MEDIUM TERM ================== (including needed for streamlines & tractography)  MEDIUM TERM ================== (including needed for streamlines & tractography)
66  ==============================  ==============================
67    
68    Want: allow X *= Y, X /= Y, X += Y, X -= Y to mean what they do in C,
69    provided that X*Y, X/Y, X+Y, X-Y are already supported.
70    Nearly every Diderot program would be simplified by this.
71    
72    Want: ability to apply "normalize" to a field itself, e.g.
73      field#1(2)[2] V = normalize(Vimg ⊛ ctmr);
74    so that V(x) = normalize((Vimg ⊛ ctmr)(x)).
75    (For now, it would be okay for the differentability of V to be 0;
76    later we can teach Diderot the quotient rule of derivatives.)
77    Having this would simplify expression of standard LIC method, and
78    would also help express other vector field expressions that arise
79    in vector field feature exraction
80    Related to this and possibly simpler:
81      image(2)[2] Vimg = load(...);
82      field#0(2)[] Vlen = |Vimg ⊛ bspln3|;
83    to get a scalar field of vector length, or
84      field#2(2)[] F = Fimg ⊛ bspln3;
85      field#0(2)[] Gmag = |∇F|;
86    to get a scalar field of gradient magnitude, or
87      field#2(2)[] F = Fimg ⊛ bspln3;
88      field#0(2)[] Gmsq = ∇F•∇F;
89    to get a scalar field of squared gradient magnitude, which is simpler
90    to differentiate.  Again, though, it would be such a benefit to have
91    these expressions, without any differentiability.  Hence my indication
92    of "field#0" for these above.
93    
94    ability to declare a field in such a way so that probe
95    positions are *always* clamped to the support of "inside";
96    there are many cases where this is the sensible behavior
97    
98  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
99  runtime buffer  runtime buffer
100    
# Line 107  Line 138 
138  other MEDIUM TERM ============  other MEDIUM TERM ============
139  ==============================  ==============================
140    
141  want: warnings when D (and likely I) is declared as a  want: warnings when "D" (reserved for differentiation) is declared as
142  variable name (now get confusing error messages now)  a variable name (get confusing error messages now)
143    
144  support for Python interop and GUI  support for Python interop and GUI
145    
# Line 116  Line 147 
147  LONG TERM ====================  LONG TERM ====================
148  ==============================  ==============================
149    
150  Better handling of variables that determines the scope of a variable based on its actual use,  Better handling of variables that determines the scope of a variable
151  instead of where the user defined it.  So, for example, we should lift strand-invariant variables  based on its actual use, instead of where the user defined it.  So,
152  to global scope.  Also prune out useless variables, which should include field variables after the  for example, we should lift strand-invariant variables to global
153  translation to mid-il.  scope.  Also prune out useless variables, which should include field
154    variables after the translation to mid-il.
155    
156  co- vs contra- index distinction  co- vs contra- index distinction
157    
# Line 144  Line 176 
176  BUGS =================  BUGS =================
177  ======================  ======================
178    
179  test/abexit.diderot  test/fields.diderot:
180          // HEY (BUG): this program can't run; this is the info from gdb (below)  documents various bugs/questions associated with field expressions
         // NOTE: if you remove the "inside" test; then it does run w/out problems  
         //   (gdb) run  
         //   Starting program: /Users/gk/diderot/diderot/pure-cfg/test/abexit  
         //   warning: posix_spawn failed, trying execvp, error: 86  
         //   Reading symbols for shared libraries ++. done  
         //   initializing globals ...  
         //  
         //   Program exited with code 01.  
         //   (gdb)  
181    
182  test/mip-cam.diderot:  test/mip-cam.diderot:
183      // generated C code looks like "(float)p_ui_0--0.5e0f"      // generated C code looks like "(float)p_ui_0--0.5e0f"
# Line 173  Line 196 
196  //  uncaught exception Size [size]  //  uncaught exception Size [size]
197  //    raised at c-target/c-target.sml:47.15-47.19  //    raised at c-target/c-target.sml:47.15-47.19
198  //field#4(3)[] F = img ⊛ bspln5;  //field#4(3)[] F = img ⊛ bspln5;
   
   

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