After some sime I tried to return to this, using dependency on older version of dagon

I got errors in dlib
Not sure how to understadn this

Error: incompatible types for (box.pmax) - (box.center): both operands are of type Vector!(float, 3)

If both operands are the same time Vector!(float, 3) I would think the subtractioon is defined in dlib ... why not ?

prokop@prokop-Lenovo-ideapad-Y700-15ISK:~/git_SW/_Dlang/dagon-demo$ dub
Performing "debug" build using /usr/bin/dmd for x86_64.
bindbc-loader 0.1.1: target for configuration "noBC" is up to date.
bindbc-soloud 0.1.0: target for configuration "library" is up to date.
bindbc-ft 0.1.0: target for configuration "library" is up to date.
bindbc-nuklear 0.1.0: target for configuration "dynamic" is up to date.
bindbc-opengl 0.4.0: target for configuration "dynamic" is up to date.
bindbc-sdl 0.4.1: target for configuration "dynamic" is up to date.
dlib 0.16.0: building configuration "library"...
../../../.dub/packages/dlib-0.16.0/dlib/dlib/coding/varint.d(42,22): Deprecation: returning this.buffer[0..this.size] escapes a reference to parameter this
../../../.dub/packages/dlib-0.16.0/dlib/dlib/coding/varint.d(42,22):        perhaps annotate the parameter with return
../../../.dub/packages/dlib-0.16.0/dlib/dlib/filesystem/stdfs.d(432,13): Deprecation: opIn_r is deprecated.  Use opBinaryRight(string op)(...) if (op == "in") instead.
../../../.dub/packages/dlib-0.16.0/dlib/dlib/filesystem/stdfs.d(550,36): Deprecation: returning this.str[0..cast(ulong)this.length] escapes a reference to parameter this
../../../.dub/packages/dlib-0.16.0/dlib/dlib/filesystem/stdfs.d(550,36):        perhaps annotate the parameter with return
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(50,16): Error: incompatible types for (this.center) - (this.size): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(51,16): Error: incompatible types for (this.center) + (this.size): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(85,22): Error: incompatible types for (b.center) - (this.center): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(103,26): Error: incompatible types for (sphere.center) - (xClosest): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(111,27): Error: incompatible types for (xDiff) / (fDist): Vector!(float, 3) and float
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(181,19): Error: incompatible types for (box.pmax) + (box.pmin): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/aabb.d(182,16): Error: incompatible types for (box.pmax) - (box.center): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(62,23): Error: incompatible types for (sphere1.center) - (sphere2.center): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(63,21): Error: incompatible types for (sphere2.center) + (res.normal.opBinary(sphere2.radius)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(75,32): Error: incompatible types for (sphere.center) - (plane.d): Vector!(float, 3) and float
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(81,21): Error: incompatible types for (sphere.center) - (res.normal.opBinary(sphere.radius)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(95,21): Error: incompatible types for (center) - (tri.v[cast(ulong)whichVert]): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(103,24): Error: incompatible types for (center) - (result.normal.opBinary(radius)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(126,13): Deprecation: opMulAssign is deprecated.  Use opOpAssign(string op)(...) if (op == "*") instead.
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(127,27): Error: incompatible types for (center) - (tri.v[cast(ulong)whichVert0]): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(129,24): Error: incompatible types for (tri.v[cast(ulong)whichVert0]) + (dir.opBinary(dot)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(132,25): Error: incompatible types for (center) - (project): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(140,28): Error: incompatible types for (center) - (result.normal.opBinary(radius)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(165,25): Error: incompatible types for (sphere.center) - (tri.normal.opBinary(distFromPlane)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(172,24): Error: incompatible types for (sphere.center) - (tri.normal.opBinary(factor).opBinary(sphere.radius)): both operands are of type Vector!(float, 3)
../../../.dub/packages/dlib-0.16.0/dlib/dlib/geometry/intersection.d(213,31): Error: incompatible types for (s.center) - (translation(b.transform)): both operands are of type Vector!(float, 3)
/usr/bin/dmd failed with exit code 1.

On Tuesday, 1 June 2021 at 20:07:39 UTC, Prokop Hapala wrote:

Error: incompatible types for (box.pmax) - (box.center): both operands are of type Vector!(float, 3)

Error messages sucks sometimes. It is likely related to const/ref combinations, for example vector operator- overloads accepting const refs and you have regular mutable vectors. D ref's is somewhat messy.

Anyway I tried dagon in past and I don't see why bother with it, better stick with something that can handle industry standard formats such as FBX, another issue is shaders fused in right in the engine.
As an alternative the only thing probably worth checking is godot-d which is native interface for scripting in Godot Engine. This engine has its quirks though (my most hated "feature" is that it requires you to create script config for each your native class).

thanks, evilrat

Basically I'm desperate do find anything which encapsulates OpenGL calls into some nice D-lang classes to learn from it. I don't really want to use Dagon, nor Godot. What I want is to use it as learning resources fro learning graphics programming in Dlang.

Rewriting my graphics engine from C++ to Dlang is huge barrier for me, sice I don't know Dlang enough. I want to see some nice Tricks and convenience of Dlang features applied to graphics programming.

Ability to compile without much hessel is minimal requirement for me.
The only thing which I was able to compile up to no was dmech, which is nice for physics but very old OpenGL

On Monday, 7 June 2021 at 14:02:14 UTC, Prokop Hapala wrote:

Ok then, no dagon won't help you that much IMHO. There is definitely a lot of projects on github with some basic engine-like functionality which encapsulates VBO, shaders, and stuff. Nothing specific that comes to mind but they do exist.(uh, maybe serpent engine?)

They are however mostly quickly hacked up student's homework rather than designed solid projects, so I again suggest you to try godot for anything serious. It's all shaders after all, doing VBO and render pipeline setups is not that much fun.

For learning graphics programming however D is ok, but you will definitely almost on your own, still github is your friend, look for existing projects on github (for example dash) on how it can be done.

As for actual language features that might help - that will be reflection and meta-programming.
With them you can generate everything from the code - VBO's, render passes, etc...
Make declarative DSL from that to rule them all!
It's fancy and all, but it is only slightly better than C++ (esp. since it has shitty OpenGL/vulkan loaders and clumsy build tools) and there's nothing new compared to it.

And final option would be to make bindings for your existing C++ code, either manually or with tools (like my own generator)
https://github.com/Superbelko/ohmygentool