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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 891, Wed Apr 20 14:57:20 2011 UTC revision 949, Fri Apr 22 19:20:24 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 42  Line 39 
39    
40  Infix "^" operator for pow() [DONE]  Infix "^" operator for pow() [DONE]
41    
42  Code generation support for 1D image data, such as RGBA transfer functions  Code generation support for 1D image data, such as RGBA transfer functions [DONE]
43    
44  ==============================  ==============================
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  extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
55    
56  expand trace in mid to low translation  expand trace in mid to low translation
57    
# 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#1(2)[] Vlen = |Vimg ⊛ ctmr|;
83    to get a scalar field of vector length, or
84      field#1(2)[] F = Fimg ⊛ ctmr;
85      field#1(2)[] Gmag = |∇F|;
86    to get a scalar field of gradient magnitude, or
87      field#1(2)[] F = Fimg ⊛ ctmr;
88      field#1(2)[] Gmsq = ∇F•∇F;
89    to get a scalar field of squared gradient magnitude
90    (which is simpler to differentiate)
91    
92    ability to declare a field in such a way so that probe
93    positions are *always* clamped to the support of "inside";
94    there are many cases where this is the sensible behavior
95    
96  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
97  runtime buffer  runtime buffer
98    
# Line 107  Line 136 
136  other MEDIUM TERM ============  other MEDIUM TERM ============
137  ==============================  ==============================
138    
139  want: warnings when D (and likely I) is declared as a  want: warnings when "D" (reserved for differentiation) is declared as
140  variable name (now get confusing error messages now)  a variable name (get confusing error messages now)
141    
142  support for Python interop and GUI  support for Python interop and GUI
143    
# Line 116  Line 145 
145  LONG TERM ====================  LONG TERM ====================
146  ==============================  ==============================
147    
148  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
149  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,
150  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
151  translation to mid-il.  scope.  Also prune out useless variables, which should include field
152    variables after the translation to mid-il.
153    
154  co- vs contra- index distinction  co- vs contra- index distinction
155    
# Line 144  Line 174 
174  BUGS =================  BUGS =================
175  ======================  ======================
176    
177  test/zslice-k1k2.diderot  test/fields.diderot:
178   If we allow "-∇F@pos" we should allow "-∇(∇F)@pos",  documents various bugs/questions associated with field expressions
  but this currently causes:  
    uncaught exception Fail [Fail: Error in compiling zslice-k1k2.diderot]  
     raised at driver/main.sml:31.39-31.76  
   
 test/zslice-k1k2.diderot (and other programs)  
   As programs are getting more complicated, the annoyance and confusion  
   caused by allowing variables to be redeclared is getting higher!  
   GLK sees no valid purpose for redeclaring a variable, even if the type is consistent.  
   In zslice-k1k2.diderot, if the green image declaration is:  
     field#0(2)[] G = imgG ⊛ tent;  
   and the geometry tensor is later declared  
     tensor[3,3] G = (P•H•P)/|g|;  
   that redeclaration causes no problems, but then usage of G the field  
     G@kk  
   causes:  
     [zslice-k1k2.diderot:52.28-32] Error: type error for binary operator "@"  
       expected:  (field#'diff0101('dim0100)'shp00FF * tensor['dim0100])  
     but found: (tensor[3,3] * vec2)  
179    
180  test/mip-cam.diderot:  test/mip-cam.diderot:
181      // generated C code looks like "(float)p_ui_0--0.5e0f"      // generated C code looks like "(float)p_ui_0--0.5e0f"
# Line 182  Line 194 
194  //  uncaught exception Size [size]  //  uncaught exception Size [size]
195  //    raised at c-target/c-target.sml:47.15-47.19  //    raised at c-target/c-target.sml:47.15-47.19
196  //field#4(3)[] F = img ⊛ bspln5;  //field#4(3)[] F = img ⊛ bspln5;
   
   

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