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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 782, Thu Apr 7 23:27:39 2011 UTC revision 945, Fri Apr 22 14:46:32 2011 UTC
# Line 1  Line 1 
 ======================  
 BUGS =================  
 ======================  
   
 test/mip-cam.diderot:  
     // generated C code looks like "(float)p_ui_0--0.5e0f"  
     //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) ...  
   
 test/vr-kcomp.diderot:  
           // HEY (BUG) stabilize function not working  
           // setting rgba should be done there  
           rgba = [gray, gray, gray, 1.0-transp];  
   
 test/vr-lite-cam.diderot:  
 // HEY (BUG): these:  
 //   vec3 lightVspDir = [1.0, -0.0, 0.0];  
 //   vec3 lightVspDir = [1.0, 0.0, -0.0];  
 // work okay but this:  
 //   vec3 lightVspDir = [1.0, 0.0, 0.0]; ...  
   
 test/zslice2.diderot:  
 // but is this not valid syntax for creating field in one shot?  
 //field#2(3)[] F = (load("../data/zimg112.nrrd")) ⊛ bspln3;  
 // It is valid syntax, but there is a bug in the conversion from HighIL to MidIL  
   
 test/zslice2.diderot:  
 // HEY (bug) bspln5 leads to problems ...  
 //  uncaught exception Size [size]  
 //    raised at c-target/c-target.sml:47.15-47.19  
 //field#4(3)[] F = img ⊛ bspln5;  
   
1  ========================  ========================
2  SHORT TERM =============  (for curvature-based VR)  SHORT TERM =============  (for curvature-based VR)
3  ========================  ========================
4    
5  Outer products  IL support for higher-order tensor values (matrices, etc).
6      syntax [DONE]      tensor construction [DONE]
7      typechecking      tensor indexing [DONE]
8      IL and codegen      tensor slicing
9        verify that hessians work correctly [DONE]
10    
11  Add M dot v, v dot M, and M dot N  Outer products [DONE]
12    
13  Identity matrix [DONE up to code generation]  Add M dot v, v dot M, and M dot N [DONE]
14    
15  determinant ("det") for tensor[3,3]  Identity matrix [DONE]
16    
17  trace [DONE]  Zero tensor [DONE]
18    
19  expand trace in mid to low translation  trace [DONE]
20    
21  extend norm (|exp|) to all tensor types  extend norm (|exp|) to tensor[3,3] [DONE]
22    
23  extend normalize to all tensor types  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 66  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]
     tensor construction  
     tensor indexing and slicing  
     verify that hessians work correctly  
37    
38  Add type aliases for color types  lerp on scalars and vectors [DONE]
     rgb = real{3}  
     rgba = real{4}  
39    
40  stabilize {} code block  Infix "^" operator for pow() [DONE]
41    
42  Decide if we want to allow redefinitions of variables  Code generation support for 1D image data, such as RGBA transfer functions [DONE]
   (as in vr-lite-cam.diderot)  
   
 DONE:  
   Infix dot product and cross product  
   lerp on scalars and vectors  
43    
44  ==============================  ==============================
45  other SHORT TERM =============  (needed for LIC)  other SHORT TERM =============  (including needed for LIC)
46  ==============================  ==============================
47    
48  vector fields: convolution on vector images  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
61        rgb = real{3}
62        rgba = real{4}
63    
64  ==============================  ==============================
65  MEDIUM TERM ================== (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    
81    ability to declare a field in such a way so that probe
82    positions are *always* clamped to the support of "inside";
83    there are many cases where this is the sensible behavior
84    
85  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
86  runtime buffer  runtime buffer
87    
# Line 101  Line 89 
89    
90  tensor fields: convolution on general tensor images  tensor fields: convolution on general tensor images
91    
92    Use of Teem's "hest" command-line parser for getting
93    any input variables that are not defined in the source file
94    
95    Save Diderot output to nrrd, instead of "mip.txt"
96      For grid of strands, save to similarly-shaped array
97      For list of strands, save to long 1-D (or 2-D for non-scalar output) list
98      For ragged things (like tractography output), will need to save both
99        complete list of values, as well as list of start indices and lengths
100        to index into complete list
101    
102  ==============================  ==============================
103  other MEDIUM TERM ============ (needed for particles)  other MEDIUM TERM ============ (needed for particles)
104  ==============================  ==============================
# Line 114  Line 112 
112    
113  spatial data structure that permits strands' queries of neighbors  spatial data structure that permits strands' queries of neighbors
114    
115    proper handling of stabilize method
116    
117    test/vr-kcomp2.diderot: Add support for code like
118    
119            (F1 if x else F2)@pos
120    
121    This will require duplication of the continuation of the conditional (but we should only
122    duplicate over the live-range of the result of the conditional.
123    
124    ==============================
125    other MEDIUM TERM ============
126    ==============================
127    
128    want: warnings when "D" (reserved for differentiation) is declared as
129    a variable name (get confusing error messages now)
130    
131    support for Python interop and GUI
132    
133  ==============================  ==============================
134  LONG TERM ====================  LONG TERM ====================
135  ==============================  ==============================
136    
137    Better handling of variables that determines the scope of a variable
138    based on its actual use, instead of where the user defined it.  So,
139    for example, we should lift strand-invariant variables to global
140    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    
145    add ":" for tensor dot product (contracts out two indices
146    instead of one like •), valid for all pairs of tensors with
147    at least two indices
148    
149  some indication of tensor symmetry  some indication of tensor symmetry
150  (have to identify the group of index permutations that are symmetries)  (have to identify the group of index permutations that are symmetries)
151    
# Line 130  Line 156 
156  Einstein summation notation  Einstein summation notation
157    
158  "tensor comprehension" (like list comprehension)  "tensor comprehension" (like list comprehension)
159    
160    Python/ctypes interface to run-timez
161    
162    ======================
163    BUGS =================
164    ======================
165    
166    test/norm2.diderot:
167    "normalize()" doesn't work on vec2
168    
169    test/fields.diderot:
170    documents various bugs/questions associated with field expressions
171    
172    test/mip-cam.diderot:
173        // generated C code looks like "(float)p_ui_0--0.5e0f"
174        //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;
175    
176    test/vr-kcomp.diderot:
177        // HEY (scoping BUG): the strand parameters (e.g. ui, vi) ...
178    
179    test/zslice2.diderot:
180    // but is this not valid syntax for creating field in one shot?
181    //field#2(3)[] F = (load("../data/zimg112.nrrd")) ⊛ bspln3;
182    // It is valid syntax, but there is a bug in the conversion from HighIL to MidIL
183    
184    test/zslice2.diderot:
185    // HEY (bug) bspln5 leads to problems ...
186    //  uncaught exception Size [size]
187    //    raised at c-target/c-target.sml:47.15-47.19
188    //field#4(3)[] F = img ⊛ bspln5;

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