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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 818, Wed Apr 13 18:38:55 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    
 want: warnings when D (and likely I) is declared as a  
 variable name (now get confusing error messages now)  
   
 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  Outer products [DONE]
     syntax [DONE]  
     typechecking  
     IL and codegen  
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]
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    Matrix addition, subtraction, and scaling  [DONE]
28    
29  Use ∇⊗ etc. syntax  Use ∇⊗ etc. syntax
30      syntax [DONE]      syntax [DONE]
# Line 43  Line 41 
41    
42  lerp on scalars and vectors [DONE]  lerp on scalars and vectors [DONE]
43    
44    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 67  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:
98      image(2)[2] Vimg = load(...);
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 92  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  support fog Python interop and GUI  want: warnings when "D" (reserved for differentiation) is declared as
148    a variable name (get confusing error messages now)
149    
150    support for Python interop and GUI
151    
152  ==============================  ==============================
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 137  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
192    (negation, addition, scalar multiplication)
193    
194    test/read2vecs.diderot:
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
199    image(2)[] Vimg = load("../data/vorttest.nrrd");
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 154  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;
   
   

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