Olhovsky

Miscellaneous Coding

Archive for category XNA

Fields vs. properties performance on the Xbox 360.

Apr 17

Posted by olhovsky in Coding, XNA | No Comments

I took Sam Allen’s performance test and ran a similar test (below) on the Xbox 360 with XNA.

static string _backing; // Backing store for property
static string Property // Getter and setter
{
get
{
return _backing;
}
[...]

Foreach through non-primitive types creates garbage.

Sep 19

Posted by olhovsky in Coding, XNA | No Comments

Time and again I have seen code like this used in XNA tutorials.

effectDrawBlock.Begin();
foreach (EffectPass pass in effectDrawBlock.CurrentTechnique.Passes)
{
pass.Begin();

gd.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, 0, 0, 35, 0, 70);

pass.End();
}
effectDrawBlock.End();

When you use a foreach over an array of ints, you will not create garbage, and it’s fast, so that’s [...]

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ToString Garbage Creation in C#

Sep 17

Posted by olhovsky in Coding, XNA | 1 Comment

I profiled my XNA game project today using the XNA Framework Remote Perf Monitor and discovered that I was generating about 8000 more manage objects per second than I was expecting to.
It turns out that this code was generating 7400 managed objects per second:
[...]

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Convert greyscale images to Alpha8 format with a Custom Content Processor in XNA 3.1.

Sep 14

Posted by olhovsky in Coding, XNA | No Comments

I noticed that at least two terrain engine examples in XNA are reading heightmap images into 4 channel textures instead of single channel textures.
To create a custom content processor that will permit you to convert any Texture2D compatible input format into an Alpha8 format texture, do the following:
Right click your game solution -> add new [...]

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