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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 763, Thu Apr 7 19:57:56 2011 UTC revision 941, Fri Apr 22 14:16:39 2011 UTC
# Line 1  Line 1 
1  Outer products  ========================
2      syntax [DONE]  SHORT TERM =============  (for curvature-based VR)
3      typechecking  ========================
     IL and codegen  
4    
5  Add M dot v, v dot M, and M dot N  IL support for higher-order tensor values (matrices, etc).
6        tensor construction [DONE]
7        tensor indexing [DONE]
8        tensor slicing
9        verify that hessians work correctly [DONE]
10    
11  Identity matrix [DONE up to code generation]  Outer products [DONE]
12    
13  trace [DONE]  Add M dot v, v dot M, and M dot N [DONE]
14    
15  expand trace in mid to low translation  Identity matrix [DONE]
16    
17  extend norm (|exp|) to all tensor types  Zero tensor [DONE]
18    
19  Infix dot product and cross product [DONE]  trace [DONE]
20    
21  lerp on scalars and vectors [DONE]  extend norm (|exp|) to tensor[3,3] [DONE]
22    
23    Matrix addition, subtraction, and scaling  [DONE]
24    
25  Use ∇⊗ etc syntax  Use ∇⊗ etc. syntax
26      syntax [DONE]      syntax [DONE]
27      typechecking      typechecking
28      IL and codegen      IL and codegen
# Line 28  Line 33 
33          value construction: '{' e1 ',' … ',' en '}'          value construction: '{' e1 ',' … ',' en '}'
34          indexing: e '{' e '}'          indexing: e '{' e '}'
35    
36  IL support for higher-order tensor values (matrices, etc).  Infix dot product and cross product [DONE]
37      tensor construction  
38      tensor indexing and slicing  lerp on scalars and vectors [DONE]
39    
40    Infix "^" operator for pow() [DONE]
41    
42    Code generation support for 1D image data, such as RGBA transfer functions [DONE]
43    
44    ==============================
45    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]
53    
54    extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
55    
56    expand trace in mid to low translation
57    
58    value-numbering optimization
59    
60  Add type aliases for color types  Add type aliases for color types
61      rgb = real{3}      rgb = real{3}
62      rgba = real{4}      rgba = real{4}
63    
64    ==============================
65    MEDIUM TERM ================== (including needed for streamlines & tractography)
66    ==============================
67    
68    ability to declare a field in such a way so that probe
69    positions are *always* clamped to the support of "inside";
70    there are many cases where this is the sensible behavior
71    
72    ability to emit/track/record variables into dynamically re-sized
73    runtime buffer
74    
75    evals & evecs for symmetric tensor[3,3]
76    
77    tensor fields: convolution on general tensor images
78    
79    Use of Teem's "hest" command-line parser for getting
80    any input variables that are not defined in the source file
81    
82    Save Diderot output to nrrd, instead of "mip.txt"
83      For grid of strands, save to similarly-shaped array
84      For list of strands, save to long 1-D (or 2-D for non-scalar output) list
85      For ragged things (like tractography output), will need to save both
86        complete list of values, as well as list of start indices and lengths
87        to index into complete list
88    
89    ==============================
90    other MEDIUM TERM ============ (needed for particles)
91    ==============================
92    
93    run-time birth and death of strands
94    
95    "initially" supports lists
96    
97    "initially" supports lists of positions output from
98    different initalization Diderot program
99    
100    spatial data structure that permits strands' queries of neighbors
101    
102    proper handling of stabilize method
103    
104    test/vr-kcomp2.diderot: Add support for code like
105    
106            (F1 if x else F2)@pos
107    
108    This will require duplication of the continuation of the conditional (but we should only
109    duplicate over the live-range of the result of the conditional.
110    
111    ==============================
112    other MEDIUM TERM ============
113    ==============================
114    
115    want: warnings when "D" (reserved for differentiation) is declared as
116    a variable name (get confusing error messages now)
117    
118    support for Python interop and GUI
119    
120    ==============================
121    LONG TERM ====================
122    ==============================
123    
124    Better handling of variables that determines the scope of a variable
125    based on its actual use, instead of where the user defined it.  So,
126    for example, we should lift strand-invariant variables to global
127    scope.  Also prune out useless variables, which should include field
128    variables after the translation to mid-il.
129    
130    co- vs contra- index distinction
131    
132    add ":" for tensor dot product (contracts out two indices
133    instead of one like •), valid for all pairs of tensors with
134    at least two indices
135    
136    some indication of tensor symmetry
137    (have to identify the group of index permutations that are symmetries)
138    
139    dot works on all tensors
140    
141    outer works on all tensors
142    
143    Einstein summation notation
144    
145    "tensor comprehension" (like list comprehension)
146    
147    Python/ctypes interface to run-timez
148    
149    ======================
150    BUGS =================
151    ======================
152    
153    test/norm2.diderot:
154    "normalize()" doesn't work on vec2
155    
156    test/fields.diderot:
157    documents various bugs/questions associated with field expressions
158    
159    test/mip-cam.diderot:
160        // generated C code looks like "(float)p_ui_0--0.5e0f"
161        //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;
162    
163    test/vr-kcomp.diderot:
164        // HEY (scoping BUG): the strand parameters (e.g. ui, vi) ...
165    
166    test/zslice2.diderot:
167    // but is this not valid syntax for creating field in one shot?
168    //field#2(3)[] F = (load("../data/zimg112.nrrd")) ⊛ bspln3;
169    // It is valid syntax, but there is a bug in the conversion from HighIL to MidIL
170    
171    test/zslice2.diderot:
172    // HEY (bug) bspln5 leads to problems ...
173    //  uncaught exception Size [size]
174    //    raised at c-target/c-target.sml:47.15-47.19
175    //field#4(3)[] F = img ⊛ bspln5;
176    
177    

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