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digitalmars.D.learn - Having trouble porting basic GLFW C++ example to D

reply Matt Jones <matthew.brennan.jones gmail.com> writes:
I've been trying to port a basic GLFW C++ example to D. The C++ 
version shows the textures correctly. But the D version shows 
nothing. The code is almost identical. Does anyone know why the D 
version does not work?

https://github.com/workhorsy/d_glfw
Oct 06 2017
parent reply Joakim <dlang joakim.fea.st> writes:
On Saturday, 7 October 2017 at 03:12:09 UTC, Matt Jones wrote:

 I've been trying to port a basic GLFW C++ example to D. The C++ 
 version shows the textures correctly. But the D version shows 
 nothing. The code is almost identical.


Heh, that's the problem.


 Does anyone know why the D version does not work?

 https://github.com/workhorsy/d_glfw


I ran into this myself, took me awhile to track it down.  I too 
took the size of dynamic arrays this way:

https://github.com/workhorsy/d_glfw/blob/master/dlang/source/main.d#L158
https://github.com/workhorsy/d_glfw/blob/master/dlang/source/main.d#L161

That will give you 2 words for a slice or dynamic array, the 
length and pointer.  What you want is the length of the array

https://github.com/joakim-noah/android/blob/master/samples/Teapot/jni/TeapotRenderer.d#L192

multiplied by the size of the element

https://github.com/joakim-noah/android/blob/master/samples/Teapot/jni/TeapotRenderer.d#L195

Sizeof works for static arrays, but is different for slices: 
that's likely your problem.
Oct 06 2017
parent reply Matt Jones <matthew.brennan.jones gmail.com> writes:
On Saturday, 7 October 2017 at 03:47:27 UTC, Joakim wrote:

 On Saturday, 7 October 2017 at 03:12:09 UTC, Matt Jones wrote:

 [...]


 Heh, that's the problem.


 [...]


 I ran into this myself, took me awhile to track it down.  I too 
 took the size of dynamic arrays this way:

 [...]


Ah. I should have remembered that problem. Thanks. I'll see if 
that fixes it.
Oct 06 2017
parent Matt Jones <matthew.brennan.jones gmail.com> writes:
On Saturday, 7 October 2017 at 04:24:07 UTC, Matt Jones wrote:

 On Saturday, 7 October 2017 at 03:47:27 UTC, Joakim wrote:

 On Saturday, 7 October 2017 at 03:12:09 UTC, Matt Jones wrote:

 [...]


 Heh, that's the problem.


 [...]


 I ran into this myself, took me awhile to track it down.  I 
 too took the size of dynamic arrays this way:

 [...]


 Ah. I should have remembered that problem. Thanks. I'll see if 
 that fixes it.


Nice! That worked. Thanks.
Oct 06 2017