On Tue, 1 May 2018, Ryan Joseph wrote:
On May 1, 2018, at 3:17 PM, Mattias Gaertner <nc-gaert...@netcologne.de> wrote:
JS only knows double for numbers.
At compile time you can use almost all the normal types: byte,
word, longint, etc.
pas2js has an alias single, but because internally it is a double this
gives warnings.
what do we do for records then? We often need to pass arrays of specific types
for functions such as glBufferData.
type
TVec2f = record
x, y: GLfloat;
end;
type
TVec2b = record
x, y: GLubyte;
end;
var
verts: array[0..2] of TVec2f;
begin
glBufferData(GL_ARRAY_BUFFER, sizeof(TVec2f) * 3, @verts, GL_STATIC_DRAW); //
pass an array of TVec2 but how does JS know this?
Arrays are arrays in JS. 'records' in JS are (literal) objects.
Note that the above call does not exist in webGL. But if something like it
existed, it would probably be
simply
glBufferData(verts, GL_STATIC_DRAW);
defined as
glBufferData(data : JSValue; aType : int);
The WebGL API would then presumably internally inspect the data, and if it is
an array, convert the Javascript array of objects to something the underlying
GL understands.
Michael.
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