On 2013-10-16 14:02, "Róbert László Páli" wrote:
Hello!
I am writing an unbiased raytrace renderer in D. I have good progress,
but I want to make it as fast as possible where I can do it without
compromises.
I use a struct with three doubles for vector and color calculations and
I have operator overloading for them. Many vectors and colors are
created during the tracing calculations.
I thought, using classes may require too much memory, because they are
not destructed on scope end, and maybe speed reduction when GC kicks in.
Is my assumptions that in this case struct are more wise?
To avoid the constructing many vectors and colors, I thought to use ref
arguments, but I also heard that ref functions are not inlined. What
would generate the fastest code for a cross-product for example?
What compiler and compilations flags should I use to generate the
fastest code? My main target is sixty-four bit machines, cross-platform.
What optimizations can I assume for various compilers? Are only once
used local variables inlined? So it secure to extract local variables
only to make the code more easy to understand?
I would say use structs. For compiler I would go with LDC or GDC. Both
of these are faster for floating point calculations than DMD. You can
always benchmark.
--
/Jacob Carlborg
