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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 821, Wed Apr 13 23:17:35 2011 UTC revision 1084, Wed May 4 08:15:37 2011 UTC
# Line 1  Line 1 
1  ========================  NOTE: GLK's approximate ranking of 5 most important tagged with
2  SHORT TERM =============  (for curvature-based VR)  [GLK:1], [GLK:2], ...
3  ========================  
4    ==============================
5  want: warnings when D (and likely I) is declared as a  other SHORT TERM =============  (including needed for LIC)
6  variable name (now get confusing error messages now)  ==============================
7    
8  For RGB color output of 2D transfer function (indexed by  [GLK:1] Add sequence types (needed for evals & evecs)
9  kappa1,kappa2), or for a 1D transfer function, will need      syntax
10  something akin to convolution on vector images          types: ty '{' INT '}'
11            value construction: '{' e1 ',' … ',' en '}'
12            indexing: e '{' e '}'
13    
14  IL support for higher-order tensor values (matrices, etc).  IL support for higher-order tensor values (matrices, etc).
15      tensor construction [DONE]      tensor construction [DONE]
16      tensor indexing [DONE]      tensor indexing [DONE]
17      tensor slicing      tensor slicing
18      verify that hessians work correctly      verify that hessians work correctly [DONE]
   
 Outer products [DONE]  
   
 Add M dot v, v dot M, and M dot N [DONE]  
   
 Identity matrix [DONE up to code generation]  
   
 trace [DONE]  
   
 extend norm (|exp|) to tensor[3,3]  
19    
20  Use ∇⊗ etc. syntax  Use ∇⊗ etc. syntax
21      syntax [DONE]      syntax [DONE]
22      typechecking      typechecking
23      IL and codegen      IL and codegen
24    
25  Add sequence types  test/uninit.diderot:
26      syntax  documents need for better compiler error messages when output variables
27          types: ty '{' INT '}'  are not initialized; the current messages are very cryptic
         value construction: '{' e1 ',' … ',' en '}'  
         indexing: e '{' e '}'  
   
 Infix dot product and cross product [DONE]  
   
 lerp on scalars and vectors [DONE]  
   
 ==============================  
 other SHORT TERM =============  (including needed for LIC)  
 ==============================  
28    
29  determinant ("det") for tensor[3,3]  determinant ("det") for tensor[3,3]
30    
 Decide if we want to allow redefinitions of variables  
   (as in vr-lite-cam.diderot)  
   
 extend norm (|exp|) to all tensor types  
   
 extend normalize to all tensor types  
   
 vector fields: convolution on vector images  
   
31  expand trace in mid to low translation  expand trace in mid to low translation
32    
33  value-numbering optimization  value-numbering optimization
# Line 64  Line 37 
37      rgba = real{4}      rgba = real{4}
38    
39  ==============================  ==============================
40  MEDIUM TERM ================== (needed for streamlines & tractography)  MEDIUM TERM ================== (including needed for streamlines & tractography)
41  ==============================  ==============================
42    
43    [GLK:1] evals & evecs for symmetric tensor[3,3] (requires sequences)
44    
45    [GLK:2] Save Diderot output to nrrd, instead of "mip.txt"
46      For grid of strands, save to similarly-shaped array
47      For list of strands, save to long 1-D (or 2-D for non-scalar output) list
48      For ragged things (like tractography output), will need to save both
49        complete list of values, as well as list of start indices and lengths
50        to index into complete list
51    
52    [GLK:3] Use of Teem's "hest" command-line parser for getting
53    any input variables that are not defined in the source file
54    
55    [GLK:4] ability to declare a field in such a way so that probe
56    positions are *always* clamped to the support of "inside";
57    there are many cases where this is the sensible behavior.
58    (could also have "repeat" declaration, to mimic GL_REPEAT texturing)
59    
60    extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
61    
62  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
63  runtime buffer  runtime buffer
64    
65  evals & evecs for symmetric tensor[3,3]  Want: allow X *= Y, X /= Y, X += Y, X -= Y to mean what they do in C,
66    provided that X*Y, X/Y, X+Y, X-Y are already supported.
67    Nearly every Diderot program would be simplified by this.
68    
69    Want: non-trivial field expressions & functions:
70      image(2)[2] Vimg = load(...);
71      field#0(2)[] Vlen = |Vimg ⊛ bspln3|;
72    to get a scalar field of vector length, or
73      field#2(2)[] F = Fimg ⊛ bspln3;
74      field#0(2)[] Gmag = |∇F|;
75    to get a scalar field of gradient magnitude, or
76      field#2(2)[] F = Fimg ⊛ bspln3;
77      field#0(2)[] Gmsq = ∇F•∇F;
78    to get a scalar field of squared gradient magnitude, which is simpler
79    to differentiate.  However, there is value in having these, even if
80    the differentiation of them is not supported (hence the indication
81    of "field#0" for these above)
82    
83    Want: ability to apply "normalize" to a field itself, e.g.
84      field#0(2)[2] V = normalize(Vimg ⊛ ctmr);
85    so that V(x) = normalize((Vimg ⊛ ctmr)(x)).
86    Having this would simplify expression of standard LIC method, and
87    would also help express other vector field expressions that arise
88    in vector field feature exraction.
89    
90  tensor fields: convolution on general tensor images  tensor fields: convolution on general tensor images
91    
# Line 78  Line 93 
93  other MEDIUM TERM ============ (needed for particles)  other MEDIUM TERM ============ (needed for particles)
94  ==============================  ==============================
95    
96  run-time birth and death of strands  [GLK:5] run-time death of strands; test/iso2d.diderot provides
97    great initial test for "die" command.
98    
99    run-time birth of strands
100    
101  "initially" supports lists  "initially" supports lists
102    
# Line 89  Line 107 
107    
108  proper handling of stabilize method  proper handling of stabilize method
109    
110  Add support for code like  test/vr-kcomp2.diderot: Add support for code like
111    
112          (F1 if x else F2)@pos          (F1 if x else F2)@pos
113    
114  This will require duplication of the continuation of the conditional (but we should only  This will require duplication of the continuation of the conditional
115  duplicate over the live-range of the result of the conditional.  (but we should only duplicate over the live-range of the result of the
116    conditional.
117    
118    add ":" for tensor dot product (contracts out two indices
119    instead of one like •), valid for all pairs of tensors with
120    at least two indices
121    
122  ==============================  ==============================
123  other MEDIUM TERM ============  other MEDIUM TERM ============
124  ==============================  ==============================
125    
126  support fog Python interop and GUI  want: warnings when "D" (reserved for differentiation) is declared as
127    a variable name (get confusing error messages now)
128    
129    support for Python interop and GUI
130    
131    Python/ctypes interface to run-time
132    
133  ==============================  ==============================
134  LONG TERM ====================  LONG TERM ====================
135  ==============================  ==============================
136    
137  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
138  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,
139  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
140  translation to mid-il.  scope.  Also prune out useless variables, which should include field
141    variables after the translation to mid-il.
142    
143  co- vs contra- index distinction  co- vs contra- index distinction
144    
 add ":" for tensor dot product (contracts out two indices  
 instead of one like •), valid for all pairs of tensors with  
 at least two indices  
   
145  some indication of tensor symmetry  some indication of tensor symmetry
146  (have to identify the group of index permutations that are symmetries)  (have to identify the group of index permutations that are symmetries)
147    
# Line 128  Line 153 
153    
154  "tensor comprehension" (like list comprehension)  "tensor comprehension" (like list comprehension)
155    
 Python/ctypes interface to run-timez  
   
156  ======================  ======================
157  BUGS =================  BUGS =================
158  ======================  ======================
159    
160  test/mip-cam.diderot:  test/bug-usevar.diderot:
161      // generated C code looks like "(float)p_ui_0--0.5e0f"  looks like varialble scoping bug is still present in some cases?
     //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;  
   
 test/vr-kcomp.diderot:  
     // HEY (scoping BUG): the strand parameters (e.g. ui, vi) ...  
162    
163  test/zslice2.diderot:  test/bug-matrix.diderot:
164  // but is this not valid syntax for creating field in one shot?  3x3 matrix subtraction is broken
165  //field#2(3)[] F = (load("../data/zimg112.nrrd")) ⊛ bspln3;  (and then fix test/vr-curv-quad.diderot)
166  // It is valid syntax, but there is a bug in the conversion from HighIL to MidIL  
167    test/fields.diderot:
168    Can't assign on field to another.
169    
170    test/read2vecs.diderot:
171    // HEY (BUG?) shouldn't it be a type error to load this 2-D array of
172    // 2-vectors into a 2-D *scalar* field?  Instead, get:
173    //   uncaught exception Fail [Fail: Error in compiling lic.diderot]
174    //     raised at driver/main.sml:31.39-31.76
175    image(2)[] Vimg = load("../data/vorttest.nrrd");
176    
177  test/zslice2.diderot:  test/zslice2.diderot:
178  // HEY (bug) bspln5 leads to problems ...  // HEY (bug) bspln5 leads to problems ...
179  //  uncaught exception Size [size]  //  uncaught exception Size [size]
180  //    raised at c-target/c-target.sml:47.15-47.19  //    raised at c-target/c-target.sml:47.15-47.19
181  //field#4(3)[] F = img ⊛ bspln5;  //field#4(3)[] F = img ⊛ bspln5;
   
   

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