[DX9] Common parameters for all shaders

Graphics and GPU Programming Programming

Started by programci_84 December 04, 2010 03:04 PM

2 comments, last by MJP 13 years, 4 months ago

programci_84

336

Author

December 04, 2010 03:04 PM

Hi all.

Suppose I've more than one shaders and they include an ".fxh" file like this one:

//common.fxhuniform extern float3  g_ViewPos;uniform extern matrix  g_ViewMat;uniform extern matrix  g_ProjMat;//blah blah blah

You know some parameters can be set per frame (like the parameters above), but some others "must" be set per object (or subset).

Now, what I want to do is this: I want to fill all the parameters declared in common.fxh "once per frame", and these parameters can be used all the other shaders includes common.fxh.

How can I do that?

Thx. in advance.
-R

There's no "hard", and "the impossible" takes just a little time.

MJP

20,295

December 04, 2010 04:38 PM

If you want to avoid setting constants every frame you need to either use effect pools, or explicitly assign constants to registers so that there's no overlap. Like this:

// These are only set once per framefloat4x4 ViewMatrix : register (c0);float4x4 ProjMatrix : register (c4);// These are set every draw callfloat4x4 WorldMatrix : register(c8);

[Edited by - MJP on December 5, 2010 2:38:04 PM]

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