Dynamic array and OpenGL problem

[Matti Niemenmaa]

Mikko Ronkainen wrote:
> Now when I got it working I'm thinking about speeding things up a bit. Few questions:
> 
> ubyte[] getFramebuffer() { return framebuffer; }
> 
> Does D pass it around as a reference?

Yes. ubyte[] is essentially:

struct ubyte_array {
	size_t length;
	ubyte* ptr;
}

And that's what gets passed around, so 8 bytes of data on a 32-bit system, 
regardless of the size of the array.

> And now I'm zeroing the framebuffer like this:
> 
> for(int i=0; i<(width*height*3); ++i)
>     framebuffer[i] = 0;
> 
> Is there more speedier way to just zero the memory? This takes most of the time in the rendering loop...

There's:

framebuffer[] = 0;

But I don't know if it's faster. Theoretically it should use memset, but if it 
doesn't, you can do it manually:

import std.c.string; // or if using Tango, import tango.stdc.string;

...

// going from memory here, check the docs to be sure of the parameter order
memset(framebuffer.ptr, 0, framebuffer.length);

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