update make,c,raytracing

Author: azimut

gamedev/graphics/raytracing.org

@@ -207,6 +207,11 @@ https://www.youtube.com/watch?v=NIAUFnNZGhE
   - https://devtalk.com/books/the-ray-tracer-challenge
 - External Links:
   - https://betterexplained.com/articles/vector-calculus-understanding-the-dot-product/
+- cglm
+  - https://github.com/recp/cglm
+  - https://cglm.readthedocs.io/en/latest/mat4.html
+  - #include "cglm/cglm.h"
+  - #include <cglm/struct.h>
 - Third party sources
   - C https://github.com/LiquidityC/ray_tracer_challenge/
     - complete 16 chapters
@@ -515,3 +520,10 @@ nn
     - unit spheres (radii = 1)
     - centered at origin
 - intesect(Sphere,Ray)
+** 11 Reflections and Refractions
+
+- Fresnel effect explains the inverse relationship between reflection and refraction
+- Real Calculations are expensive, so we use Schlick approximation
+- *Refractive* objects are often *Reflective* too. (eg: glass, both ~1)
+- Reduce *diffuse/ambient* on reflective/refractive as less light comes from the surface and more from elsewhere.
+- specular=1 shininess=300 pair well with reflective+refractive

languages/compiled/c/articles.org

@@ -167,12 +167,19 @@ https://0x00sec.org/t/remote-shells-part-i/269/1
 |  MSan | uninitialized memory usage | memory      |
 |  TSan | thread concurrency bugs    | thread      |
 |-------+----------------------------+-------------|
+- https://github.com/google/sanitizers/wiki/MemorySanitizer
+- https://github.com/google/sanitizers/wiki/AddressSanitizer
+  https://clang.llvm.org/docs/AddressSanitizer.html
+- https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
+  - Compile with -g, -fno-sanitize-merge and -fno-omit-frame-pointer to get proper debug information in your binary.
+  - Run your program with environment variable UBSAN_OPTIONS=print_stacktrace=1.
+  - Make sure llvm-symbolizer binary is in PATH.
+
 - valgrind, fuzzers, libcheck, pvs
 - https://tek256.com/posts/code-hardening/
 - Static http://splint.org/
 - video fuzzers 15 [[https://www.youtube.com/watch?v=qTkYDA0En6U][Beyond Sanitizers...]] by Kostya Serebryany
 - https://www.youtube.com/watch?v=Q2C2lP8_tNE
-- https://github.com/google/sanitizers/wiki/AddressSanitizer
 - https://valgrind.org/docs/manual/quick-start.html
 - https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html
 * Benchmarks

languages/compiled/c/tools.org

@@ -2,6 +2,8 @@
 - clang-format
   - https://emacs.stackexchange.com/questions/55635/how-can-i-set-up-clang-format-in-emacs
     clang-format -style=llvm -dump-config > .clang-format
+- sanitizers
+  - ASAN compatible with gdb https://github.com/google/sanitizers/wiki/AddressSanitizerAndDebugger
 * Editors
 - emacs
   - http://blog.lujun9972.win/emacs-document/blog/2018/03/22/emacs-as-a-c++-ide/index.html

languages/compiled/makefile/self.org

@@ -149,20 +149,32 @@ $(ab:.cpp=.o) # string replace
 |  += | appends with a space                       |
 |  != | exec shell command and assign it           |
 |-----+--------------------------------------------|
+*** target specific
+  #+begin_src makefile
+%.o: CFLAGS = -O
+  #+end_src
+*** goal specific
+#+begin_src makefile
+ifeq (,$(filter debug,$(MAKECMDGOALS))
+    CFLAGS += -Og
+endif
+#+end_src
 *** implicit / predefined / default
 https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html
 |---------------+-------------------------------------------|
-| CC            | For compiler and compiler flags           |
-| CXX           | "                                         |
-| CFLAGS        | "                                         |
-| CPPFLAGS      |                                           |
-| CXXFLAGS      |                                           |
-| LDFLAGS       | for flags passed to compiler when linking |
-| LDLIBS        | For flags about libraries when linking    |
-| SHELL         | eg: "bash"                                |
-| MAKE_FLAGS    |                                           |
-| MAKEFILE_LIST |                                           |
-| .SHELLFLAGS   | eg: "-eu -o pipefail -c"                  |
+|      <c>      |                                           |
+|      CC       | For compiler and compiler flags           |
+|      CXX      | "                                         |
+|    CFLAGS     | "                                         |
+|   CPPFLAGS    |                                           |
+|   CXXFLAGS    |                                           |
+|    LDFLAGS    | for flags passed to compiler when linking |
+|    LDLIBS     | For flags about libraries when linking    |
+| MAKEFILE_LIST | list of Makefile's                        |
+| MAKECMDGOALS  | the target given                          |
+|   MAKEFLAGS   |                                           |
+|     SHELL     | eg: "bash"                                |
+|  .SHELLFLAGS  | eg: "-eu -o pipefail -c"                  |
 | .RECIPEPREFIX | use instead of tabs                       |
 | .DEFAULT_GOAL | default target                            |
 |---------------+-------------------------------------------|