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digitalmars.D.learn - How to I translate this C++ structure/array

reply "WhatMeWorry" <kheaser gmail.com> writes:
This is probably trivial but I just can't make a break thru.

I've got C++ code using glm like so:

    struct Vertex
     {
         glm::vec3 position;
         glm::vec3 color;
     }

     Vertex triangle[] =
     [
         glm::vec3(0.0,  1.0, 0.0),
         glm::vec3(1.0,  0.0, 0.0),   // red

         // code removed for brevity.
     ];


And in D I'm using the gl3n library instead of glm.


     struct Vertex
     {
         vec3 position;
         vec3 color;
     }

     Vertex triangle[6] =
     [
         vec3(0.0,  1.0, 0.0),
         vec3(1.0,  0.0, 0.0),   // red

        // code removed for brevity.
     ];

I keep getting the following:

MeGlWindow.d(171): Error: cannot implicitly convert expression 
(Vector([0.000000F, 1.00000F, 0.000000F])) of type Vector!(float, 
3) to Vertex
MeGlWindow.d(172): Error: cannot implicitly convert expression 
(Vector([1.00000F, 0.000000F, 0.000000F])) of type Vector!(float, 
3) to Vertex
MeGlWindow.d(174): Error: cannot implicitly convert expression 
(Vector([-1F, -1F, 0.000000F])) of type Vector!(float, 3) to 
Vertex
May 02 2015
parent reply "anonymous" <anonymous example.com> writes:
On Saturday, 2 May 2015 at 22:01:10 UTC, WhatMeWorry wrote:

     struct Vertex
     {
         vec3 position;
         vec3 color;
     }

     Vertex triangle[6] =
     [
         vec3(0.0,  1.0, 0.0),
         vec3(1.0,  0.0, 0.0),   // red

        // code removed for brevity.
     ];

 I keep getting the following:

 MeGlWindow.d(171): Error: cannot implicitly convert expression 
 (Vector([0.000000F, 1.00000F, 0.000000F])) of type 
 Vector!(float, 3) to Vertex


You have to be explicit:

     Vertex[6] triangle = /* [1] */
     [
         Vertex(
             vec3(0.0,  1.0, 0.0),
             vec3(1.0,  0.0, 0.0),   // red
         ),
         ...
     ];

[1] `Vertex triangle[6]` works, but please don't do that.
May 02 2015
parent reply "WhatMeWorry" <kc_heaser yahoo.com> writes:
On Saturday, 2 May 2015 at 22:36:29 UTC, anonymous wrote:

 On Saturday, 2 May 2015 at 22:01:10 UTC, WhatMeWorry wrote:

    struct Vertex
    {
        vec3 position;
        vec3 color;
    }

    Vertex triangle[6] =
    [
        vec3(0.0,  1.0, 0.0),
        vec3(1.0,  0.0, 0.0),   // red

       // code removed for brevity.
    ];

 I keep getting the following:

 MeGlWindow.d(171): Error: cannot implicitly convert expression 
 (Vector([0.000000F, 1.00000F, 0.000000F])) of type 
 Vector!(float, 3) to Vertex


 You have to be explicit:

     Vertex[6] triangle = /* [1] */
     [
         Vertex(
             vec3(0.0,  1.0, 0.0),
             vec3(1.0,  0.0, 0.0),   // red
         ),
         ...
     ];

 [1] `Vertex triangle[6]` works, but please don't do that.


Thanks. I assume you would prefer I use triangle[] but with 
OpenGL calls the dynamic arrays don't work.  But maybe that is 
another question for another time.
May 02 2015
parent reply "anonymous" <anonymous example.com> writes:
On Sunday, 3 May 2015 at 02:31:51 UTC, WhatMeWorry wrote:

 On Saturday, 2 May 2015 at 22:36:29 UTC, anonymous wrote:


[...]

 [1] `Vertex triangle[6]` works, but please don't do that.


 Thanks. I assume you would prefer I use triangle[] but with 
 OpenGL calls the dynamic arrays don't work.  But maybe that is 
 another question for another time.


No no, Vertex[6] as a type is fine. It's about where you put that 
"[6]":
Vertex[6] triangle; /* D style - yay */
Vertex triangle[6]; /* C style - boo */
May 03 2015
next sibling parent "WhatMeWorry" <kheaser gmail.com> writes:
On Sunday, 3 May 2015 at 10:56:44 UTC, anonymous wrote:

 On Sunday, 3 May 2015 at 02:31:51 UTC, WhatMeWorry wrote:

 On Saturday, 2 May 2015 at 22:36:29 UTC, anonymous wrote:


 [...]

 [1] `Vertex triangle[6]` works, but please don't do that.


 Thanks. I assume you would prefer I use triangle[] but with 
 OpenGL calls the dynamic arrays don't work.  But maybe that is 
 another question for another time.


 No no, Vertex[6] as a type is fine. It's about where you put 
 that "[6]":
 Vertex[6] triangle; /* D style - yay */
 Vertex triangle[6]; /* C style - boo */


Oh, sure. Code has been changed.  Bad habits are hard to kill.
May 03 2015
prev sibling parent "WhatMeWorry" <kheaser gmail.com> writes:
On Sunday, 3 May 2015 at 10:56:44 UTC, anonymous wrote:

 On Sunday, 3 May 2015 at 02:31:51 UTC, WhatMeWorry wrote:

 On Saturday, 2 May 2015 at 22:36:29 UTC, anonymous wrote:


 [...]

 [1] `Vertex triangle[6]` works, but please don't do that.


 Thanks. I assume you would prefer I use triangle[] but with 
 OpenGL calls the dynamic arrays don't work.  But maybe that is 
 another question for another time.


 No no, Vertex[6] as a type is fine. It's about where you put 
 that "[6]":
 Vertex[6] triangle; /* D style - yay */
 Vertex triangle[6]; /* C style - boo */


Oh sure, I've changed the code. I wish D had been my first 
language.
May 03 2015