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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 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  BUGS =================  [GLK:1], [GLK:2], ...
 ======================  
   
 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]; ...  
3    
4  test/zslice2.diderot:  ==============================
5  // but is this not valid syntax for creating field in one shot?  other SHORT TERM =============  (including needed for LIC)
6  //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  
7    
8  test/zslice2.diderot:  [GLK:1] Add sequence types (needed for evals & evecs)
9  // HEY (bug) bspln5 leads to problems ...      syntax
10  //  uncaught exception Size [size]          types: ty '{' INT '}'
11  //    raised at c-target/c-target.sml:47.15-47.19          value construction: '{' e1 ',' … ',' en '}'
12  //field#4(3)[] F = img ⊛ bspln5;          indexing: e '{' e '}'
13    
14  ========================  IL support for higher-order tensor values (matrices, etc).
15  SHORT TERM =============  (for curvature-based VR)      tensor construction [DONE]
16  ========================      tensor indexing [DONE]
17        tensor slicing
18        verify that hessians work correctly [DONE]
19    
20  Outer products  Use ∇⊗ etc. syntax
21      syntax [DONE]      syntax [DONE]
22      typechecking      typechecking
23      IL and codegen      IL and codegen
24    
25  Add M dot v, v dot M, and M dot N  test/uninit.diderot:
26    documents need for better compiler error messages when output variables
27  Identity matrix [DONE up to code generation]  are not initialized; the current messages are very cryptic
28    
29  determinant ("det") for tensor[3,3]  determinant ("det") for tensor[3,3]
30    
 trace [DONE]  
   
31  expand trace in mid to low translation  expand trace in mid to low translation
32    
33  extend norm (|exp|) to all tensor types  value-numbering optimization
   
 extend normalize to all tensor types  
   
 Use ∇⊗ etc syntax  
     syntax [DONE]  
     typechecking  
     IL and codegen  
   
 Add sequence types  
     syntax  
         types: ty '{' INT '}'  
         value construction: '{' e1 ',' … ',' en '}'  
         indexing: e '{' e '}'  
   
 IL support for higher-order tensor values (matrices, etc).  
     tensor construction  
     tensor indexing and slicing  
     verify that hessians work correctly  
34    
35  Add type aliases for color types  Add type aliases for color types
36      rgb = real{3}      rgb = real{3}
37      rgba = real{4}      rgba = real{4}
38    
39  stabilize {} code block  ==============================
40    MEDIUM TERM ================== (including needed for streamlines & tractography)
41    ==============================
42    
43  Decide if we want to allow redefinitions of variables  [GLK:1] evals & evecs for symmetric tensor[3,3] (requires sequences)
   (as in vr-lite-cam.diderot)  
44    
45  DONE:  [GLK:2] Save Diderot output to nrrd, instead of "mip.txt"
46    Infix dot product and cross product    For grid of strands, save to similarly-shaped array
47    lerp on scalars and vectors    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  other SHORT TERM =============  (needed for LIC)  any input variables that are not defined in the source file
 ==============================  
54    
55  vector fields: convolution on vector images  [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]
 MEDIUM TERM ================== (needed for streamlines & tractography)  
 ==============================  
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 105  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 114  Line 105 
105    
106  spatial data structure that permits strands' queries of neighbors  spatial data structure that permits strands' queries of neighbors
107    
108    proper handling of stabilize method
109    
110    test/vr-kcomp2.diderot: Add support for code like
111    
112            (F1 if x else F2)@pos
113    
114    This will require duplication of the continuation of the conditional
115    (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 ============
124    ==============================
125    
126    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
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  some indication of tensor symmetry  some indication of tensor symmetry
# Line 130  Line 152 
152  Einstein summation notation  Einstein summation notation
153    
154  "tensor comprehension" (like list comprehension)  "tensor comprehension" (like list comprehension)
155    
156    ======================
157    BUGS =================
158    ======================
159    
160    test/bug-usevar.diderot:
161    looks like varialble scoping bug is still present in some cases?
162    
163    test/bug-matrix.diderot:
164    3x3 matrix subtraction is broken
165    (and then fix test/vr-curv-quad.diderot)
166    
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:
178    // HEY (bug) bspln5 leads to problems ...
179    //  uncaught exception Size [size]
180    //    raised at c-target/c-target.sml:47.15-47.19
181    //field#4(3)[] F = img ⊛ bspln5;

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