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amigocz

Max array size for Vertex Shader

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Hi, I'm trying to implement a Shader Instancing to improve my particle system's performance. So I just pass an array of all the nesesary information into the Vertex Shader and I'm just wondering how big arrays can I make using D3D9 to reduce the number of draw calls as much as possible. Is there any way how to compute this value and does it vari on different graphics cards? Or is there any recommended size?

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Direct3D 9 supports a maximum of 256 vertex shader constants. The actual number is in the MaxVertexShaderConst cap (you can check out the card caps document in the SDK for this value on quite a few cards). (Direct3D actually supports more than 256 constants, but no cards, even not D3D10 ones which could, supports that.) Availability of constants will determine the maximum array size.

However, I see little reason not to use real instancing.

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