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update c (openmp), gnuplot
1 parent b1d9ba3 commit 0eb4070

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-48
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4 files changed

+137
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‎gamedev/graphics/raytracing.org‎

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- article: ps https://seriot.ch/projects/postscript_tiny_ray_tracer.html
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- article: clojure https://www.abhirag.com/ray_tracer/
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- article: C https://fabiensanglard.net/postcard_pathtracer/
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- article: C https://drakeor.com/2021/06/14/simple-software-based-raytracer-in-c/
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- article: C++ https://fabiensanglard.net/rayTracing_back_of_business_card/
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- c++ -O3 -o card card.cpp
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‎languages/compiled/c/libraries.org‎

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- (24) https://github.com/begriffs/libderp
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- (10) https://github.com/lelanthran/libds
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- (480) coroutines https://github.com/tidwall/neco
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* OpenMP
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- wiki https://en.wikipedia.org/wiki/OpenMP
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- not OpenMPI
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- Mark variable thread local
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#+begin_src c
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#pragma omp parallel
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#pragma omp parallel for
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#pragma omp parallel for schedule(dynamic, 1) private(r)
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#pragma omp threadprivate (generator)
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#+end_src
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- options
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|-------------+---------------------+------------------------------------|
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| <c> | <c> | |
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| num_threads | N | |
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| private | [VAR] | variables private to each thread |
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| shared | [VAR] | variables shared among each thread |
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| default | private¦shared¦none | default variable behaviour |
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| for | _ | a loop that can be parallelized |
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| sections | _ | a block that can be parallelized |
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| single | _ | |
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| master | _ | |
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|-------------+---------------------+------------------------------------|
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- compile
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#+begin_src sh
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$ export OMP_NUM_THREADS=4
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$ gcc -fopenmp hello.c -o hello -ldl
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#+end_src

‎languages/compiled/c/self.org‎

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@@ -461,7 +461,7 @@ As a pointer type
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| complex.h | | ~Complex number~ arithmetic |
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| fenv.h | | Floating-point environment |
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| inttypes.h | | Format conversion of integer types |
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| tgmath.h | | Type-generic math (macros wrapping math.h and complex.h) |
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| [[https://en.wikibooks.org/wiki/C_Programming/tgmath.h][tgmath.h]] | | Type-generic math (macros wrapping math.h and complex.h) |
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| stdbool.h | bool | Macros for boolean type |
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| | false (0) | |
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| | true (1) | |

‎terminal/tools/visualization/gnuplot/self.org‎

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* language
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#+begin_src sh
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#+begin_src gnuplot
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#!/usr/bin/gnuplot -persist
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a = 7 # variable assignent
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f(x,d) = d * x**2 # functions
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g(x) = x <= 0 ? sin(x) : NaN
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#+end_src
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- has variable assignment
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- NaN type
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- "(/Symbol p)" - replaces parens with 𝛑
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- curve fitting https://www.youtube.com/watch?v=vHM_5AeKwXE
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- do for [i=1:96] { plot f(x,i*0.1) }
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- operators http://www.gnuplot.info/docs_4.2/node55.html
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** functions
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- http://www.gnuplot.info/docs/loc1283.html
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- math
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- string
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- time
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- other
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** input data
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- space separated by default
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*** plot
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- [re]plot [PLOT_A OPTS], [PLOT_B OPTS]
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- for [n = 1 : 5]
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- widths = "30 15 5"
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for [width in widths]
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- "+" (previous filename)
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- "filename.txt"
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- /dev/stdin
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- using N:N+1:N+n
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- smooth [bezier¦mcsplines]
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- title (for legend box)
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- title S (for legend box)
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- index N
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- reference block N of data (aka separated by 2 \n)
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- blocks index start at 0
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- with
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- histograms
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- filledcurves
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- fillstyle pattern N
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- linespoint
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- lines
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- linestyle N
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- linecolor rgb "#0b0000"
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- [d]ash[t]ype N
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- [d]ash[t]ype S
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- [l]ine[s]tyle N
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- [l]ine[t]ype N
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- [l]ine[c]olor rgb "#0b0000"
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- [l]ine[c]olor rgb "green"
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- [l]ine[w]ith N
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- points
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- pointsize N
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- imagesc - matrix/heatmap - 2d contour
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** options (setteable)
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*** general
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#+CAPTION: S = a quoted string, N = a number
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|--------------+-------------------+------------------------------------|
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| <c> | <c> | |
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| | argument | description |
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|--------------+-------------------+------------------------------------|
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| border | [N] | axis lines (takes the bitsum) |
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| [x¦y¦z]tics | [nomirror¦rotate] | axis numbers |
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| | START,STEP,END | |
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| | (S N[,S N]) | custom labels S at point N |
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| [x¦y¦z]label | S | axis label |
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| | offset N | |
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| [x¦y¦z]range | [N:N] | axis range |
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| grid | - | axis grid |
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| key | [BLTR] [[no]box] | enable/disable/position legend box |
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| | width N | |
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| | font S | use ",14" to only change it's size |
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| | at N,N | |
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|--------------+-------------------+------------------------------------|
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| samples | N | ???? |
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| xdata | time | tells x axis is a date/time |
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| encoding | utf8 | |
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| timefmt | S | format of the INPUT date |
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| datafile | separator S | input separator (default: space) |
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|--------------+-------------------+------------------------------------|
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| title | S | the |
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| format | [x¦y] FMT | tic format string |
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| scale | N | |
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| logscale | [x¦y] [N] | with step N |
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| autoscale | [[x¦y]fix] | prevents autoextend of scale |
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| output | S | saves into filepath at S |
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|--------------+-------------------+------------------------------------|
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| pause | N | seconds to pause |
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| +reread+ | - | REMOVED in 6.0 +reread input+ |
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|--------------+-------------------+------------------------------------|
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#+CAPTION: S ="string", N=number, F=float
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|------------+------------+-----------------------------------|
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| <c> | <c> | |
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| table | "FILENAME" | save plot to file, unset it after |
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| encoding | utf8 | |
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|------------+------------+-----------------------------------|
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| title | S | the |
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| scale | N | |
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| output | S | saves into filepath at S |
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| monochrome | _ | |
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|------------+------------+-----------------------------------|
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| pause | N | seconds to pause |
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| +reread+ | - | REMOVED in 6.0 +reread input+ |
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|------------+------------+-----------------------------------|
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*** general: file parsing
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|-----------+-----------------+----------------------------------|
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| <c> | <c> | |
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|-----------+-----------------+----------------------------------|
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| datafile | separator S | |
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| | separator tab | |
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| | separator comma | input separator (default: space) |
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|-----------+-----------------+----------------------------------|
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| samples | N | sampling frequency |
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| [xyz]data | time | tells ? axis is a date/time |
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| timefmt | FMT | INPUT format date |
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| format | [x¦y] FMT | OUTPUT format string |
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|-----------+-----------------+----------------------------------|
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*** general: axis styling
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#+CAPTION: S ="string", N=number, F=float
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|---------------+----------------+----------------------------------|
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| <c> | <c> | |
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|---------------+----------------+----------------------------------|
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| border | [N] | pick axis lines (takes a bitsum) |
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| grid | - | axis grid |
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| logscale | [x¦y] [N] | with step N |
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| autoscale | [[x¦y]fix] | prevents autoextend of scale |
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| xdata | time | tells ? axis is a date/time |
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| format | [x¦y] FMT | OUTPUT format string |
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| [xyz][2]range | [N:N] | axis range |
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| [xyz][2]tics | nomirror | axis numbers |
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| | rotate | |
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| | START,STEP,END | |
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| | (S N[,S N]) | custom labels S at point N |
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| [xyz][2]label | S | axis label |
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| | offset N | |
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|---------------+----------------+----------------------------------|
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*** key
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|-----+---------------+-------------------------------|
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| | <c> | |
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| key | [BLTR] | position legend box |
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| | [no]box | enable/disable |
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| | at graph F, F | |
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| | width N | |
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| | font S | use ",14" to change size only |
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| | at N,N | |
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|-----+---------------+-------------------------------|
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*** style
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|------------------+---------------------------------|
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| fill transparent | |
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| solid F | |
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| noborder | |
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| data lines | |
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| line N | can be later referenced on plot |
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|------------------+---------------------------------|
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|-----------+-------------+----------------------------------|
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| <c> | <c> | |
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| fill | transparent | |
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| | solid | |
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| solid | F | |
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| noborder | _ | |
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| data | lines | sets default for *plot* with ... |
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| | histograms | |
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| line | N | can be later referenced on plot |
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| histogram | gap N | |
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| | cluster | |
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| | clustered | |
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| | rowstacked | |
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|-----------+-------------+----------------------------------|
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#+CAPTION: gnuplot "test" command output
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#+ATTR_HTML: :width 500
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* tools
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- emacs: [[https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-gnuplot.html][Org-babel-gnuplot]]
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- wrapper: plot realtime and stored data from the cli https://github.com/dkogan/feedgnuplot
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- config https://github.com/Gnuplotting/gnuplot-configs
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- pallettes

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