Home My Page Projects Code Snippets Project Openings diderot

# SCM Repository

[diderot] Diff of /branches/pure-cfg/TODO
 [diderot] / branches / pure-cfg / TODO

# Diff of /branches/pure-cfg/TODO

revision 824, Thu Apr 14 15:54:24 2011 UTC revision 962, Sat Apr 23 19:33:19 2011 UTC
# Line 1  Line 1
1
2    NOTE: GLK's approximate ranking of 6 most imporant tagged with
3    [GLK:1], [GLK:2], ...
4
5  ========================  ========================
6  SHORT TERM =============  (for curvature-based VR)  SHORT TERM =============  (for curvature-based VR)
7  ========================  ========================
8
For RGB color output of 2D transfer function (indexed by
kappa1,kappa2), or for a 1D transfer function, will need
something akin to convolution on vector images

9  IL support for higher-order tensor values (matrices, etc).  IL support for higher-order tensor values (matrices, etc).
10      tensor construction [DONE]      tensor construction [DONE]
11      tensor indexing [DONE]      tensor indexing [DONE]
12      tensor slicing      tensor slicing
13      verify that hessians work correctly      verify that hessians work correctly [DONE]
14
15  Outer products [DONE]  Outer products [DONE]
16
17  Add M dot v, v dot M, and M dot N [DONE]  Add M dot v, v dot M, and M dot N [DONE]
18
19  Identity matrix [DONE up to code generation]  Identity matrix [DONE]
20
21  Zero tensor [DONE up to code generation]  Zero tensor [DONE]
22
23  trace [DONE]  trace [DONE]
24
25  extend norm (|exp|) to tensor[3,3]  extend norm (|exp|) to tensor[3,3] [DONE]
26
27  extend implementation of scaling to work on higher-order tensors (it currently  Matrix addition, subtraction, and scaling  [DONE]
just works on vectors)
28
29  Use ∇⊗ etc. syntax  Use ∇⊗ etc. syntax
30      syntax [DONE]      syntax [DONE]
# Line 44  Line 43
43
44  Infix "^" operator for pow() [DONE]  Infix "^" operator for pow() [DONE]
45
46    Code generation support for 1D image data, such as RGBA transfer functions [DONE]
47
48  ==============================  ==============================
49  other SHORT TERM =============  (including needed for LIC)  other SHORT TERM =============  (including needed for LIC)
50  ==============================  ==============================
51
52  determinant ("det") for tensor[3,3]  test/uninit.diderot:
53    documents need for better compiler error messages when output variables
54  Decide if we want to allow redefinitions of variables  are not initialized; the current messages are very cryptic
(as in vr-lite-cam.diderot)

extend norm (|exp|) to all tensor types
55
56  extend normalize to all tensor types  determinant ("det") for tensor[3,3]
57
58  vector fields: convolution on vector images  extend norm (|exp|) to all tensor types [DONE for vectors and matrices]
59
60  expand trace in mid to low translation  expand trace in mid to low translation
61
# Line 68  Line 66
66      rgba = real{4}      rgba = real{4}
67
68  ==============================  ==============================
69  MEDIUM TERM ================== (needed for streamlines & tractography)  MEDIUM TERM ================== (including needed for streamlines & tractography)
70  ==============================  ==============================
71
72    [GLK:3] evals & evecs for symmetric tensor[3,3] (requires sequences)
73
74    [GLK:4] Save Diderot output to nrrd, instead of "mip.txt"
75      For grid of strands, save to similarly-shaped array
76      For list of strands, save to long 1-D (or 2-D for non-scalar output) list
77      For ragged things (like tractography output), will need to save both
78        complete list of values, as well as list of start indices and lengths
79        to index into complete list
80
81    [GLK:5] Use of Teem's "hest" command-line parser for getting
82    any input variables that are not defined in the source file
83
84    [GLK:6] ability to declare a field in such a way so that probe
85    positions are *always* clamped to the support of "inside";
86    there are many cases where this is the sensible behavior.
87    (More generally, we could also have "repeat" declaration,
88    copying action of GL_REPEAT in texturing)
89
90  ability to emit/track/record variables into dynamically re-sized  ability to emit/track/record variables into dynamically re-sized
91  runtime buffer  runtime buffer
92
93  evals & evecs for symmetric tensor[3,3]  Want: allow X *= Y, X /= Y, X += Y, X -= Y to mean what they do in C,
94    provided that X*Y, X/Y, X+Y, X-Y are already supported.
95    Nearly every Diderot program would be simplified by this.
96
97    Want: non-trivial field expressions & functions:
99      field#0(2)[] Vlen = |Vimg ⊛ bspln3|;
100    to get a scalar field of vector length, or
101      field#2(2)[] F = Fimg ⊛ bspln3;
102      field#0(2)[] Gmag = |∇F|;
103    to get a scalar field of gradient magnitude, or
104      field#2(2)[] F = Fimg ⊛ bspln3;
105      field#0(2)[] Gmsq = ∇F•∇F;
106    to get a scalar field of squared gradient magnitude, which is simpler
107    to differentiate.  However, there is value in having these, even if
108    the differentiation of them is not supported (hence the indication
109    of "field#0" for these above)
110
111    Want: ability to apply "normalize" to a field itself, e.g.
112      field#0(2)[2] V = normalize(Vimg ⊛ ctmr);
113    so that V(x) = normalize((Vimg ⊛ ctmr)(x)).
114    Having this would simplify expression of standard LIC method, and
115    would also help express other vector field expressions that arise
116    in vector field feature exraction.
117
118  tensor fields: convolution on general tensor images  tensor fields: convolution on general tensor images
119
# Line 93  Line 132
132
133  proper handling of stabilize method  proper handling of stabilize method
134
135  Add support for code like  test/vr-kcomp2.diderot: Add support for code like
136
137          (F1 if x else F2)@pos          (F1 if x else F2)@pos
138
139  This will require duplication of the continuation of the conditional (but we should only  This will require duplication of the continuation of the conditional
140  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
141    conditional.
142
143  ==============================  ==============================
144  other MEDIUM TERM ============  other MEDIUM TERM ============
145  ==============================  ==============================
146
147  want: warnings when D (and likely I) is declared as a  want: warnings when "D" (reserved for differentiation) is declared as
148  variable name (now get confusing error messages now)  a variable name (get confusing error messages now)
149
150  support for Python interop and GUI  support for Python interop and GUI
151
# Line 113  Line 153
153  LONG TERM ====================  LONG TERM ====================
154  ==============================  ==============================
155
156  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
157  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,
158  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
159  translation to mid-il.  scope.  Also prune out useless variables, which should include field
160    variables after the translation to mid-il.
161
162  co- vs contra- index distinction  co- vs contra- index distinction
163
# Line 141  Line 182
182  BUGS =================  BUGS =================
183  ======================  ======================
184
185    [GLK:1] test/derivs2.diderot:
186    test/derivs3.diderot:
187    gradients & Hessians are not being transformed from index-to-world,
188    these test programs should produce black images when that is working
189
190    [GLK:2] test/fields.diderot:
191    documents various bugs/questions associated with simple field expressions
193
195    // HEY (BUG?) shouldn't it be a type error to load this 2-D array of
196    // 2-vectors into a 2-D *scalar* field?  Instead, get:
197    //   uncaught exception Fail [Fail: Error in compiling lic.diderot]
198    //     raised at driver/main.sml:31.39-31.76
200
201    test/iso2d.diderot: not able to use "nan".
202              // HEY (BUG) not able to use NaN as in "pos = [nan,nan]"
203              // generated C code "vec2f(nanf, nanf)" causes problems:
204              // iso2d.c: In function ‘sample_update’:
205              // iso2d.c:86: error: incompatible type for argument 1 of ‘vec2f’
206              // iso2d.c:86: error: incompatible type for argument 2 of ‘vec2f’
207              // uncaught exception Fail [Fail: error compiling/linking]
208              //   raised at c-target/c-target.sml:323.14-323.44
209              pos = [∞,∞];  // should be: pos = [nan,nan];
210
211  test/mip-cam.diderot:  test/mip-cam.diderot:
212      // generated C code looks like "(float)p_ui_0--0.5e0f"      // generated C code looks like "(float)p_ui_0--0.5e0f"
213      //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;      //real rayU = 2.0*camUmax*(real(ui) - -0.5)/real(imgResU) - camUmax;
# Line 158  Line 225
225  //  uncaught exception Size [size]  //  uncaught exception Size [size]
226  //    raised at c-target/c-target.sml:47.15-47.19  //    raised at c-target/c-target.sml:47.15-47.19
227  //field#4(3)[] F = img ⊛ bspln5;  //field#4(3)[] F = img ⊛ bspln5;

Legend:
 Removed from v.824 changed lines Added in v.962