Do TEXCOORDS need to be in sequence?

Question

do the texcoord values in the vert to frag struct need to be in sequence? for example can i have a struct like this

struct v2f {

float2 UV: TEXCOORD0; float3 Color: TEXCOORD5;

}

or do they have to be ordered 012345. im asking because i have a shader with multiple compile setups that need different values in the vert to frag struct.

Answer 1

Answer by helarts · Dec 05, 2015 at 01:21 AM

I didn't notice any particular issue with fancy orders on DX9, DX11 and OpenGL, but I feel better with a serie of #ifdef like so:

 float2 uv : TEXCOORD0;
 
 #if defined (FEATURE_A) || defined (FEATURE_B) 
        float4 color : TEXCOORD1;
        float3 fancyThing : TEXCOORD2;
 #else
       float3 fancyThing : TEXCOORD1;
 #endif

Edit: This is how it is done in builtin shaders, so I guess it is the way to go.

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Do TEXCOORDS need to be in sequence?

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