another shader question re: texcoords

float4 color = tex2D( foreground, Tex.xy + 0.1 );
return color;[/code:17zosu4h]the texture is not only displaced as expected, but even drawn outside of the sprite's bounds. it also produces strange artifacts when moving the sprite close to the layout's borders. this happens with and without any combination of #BORDERMODE and #CROSS-SAMPLING, with varying funniness.

the following pixel shader, on the other hand:
[code:17zosu4h]float4 color = float4( 0, 0, 0, 1 );
if( Tex.x <= 0.1 ){ color = 1; }
if( Tex.x >= 0.9 ){ color = 1; }
return color;[/code:17zosu4h]produces white stripes on the sprite only when its bounds are moved near the borders of the layout.

could you enlighten me with what's going on, aka what geometry & texture the shader is really working on? (it is confusing that the first is not a sprite-sized quad since it can [i]sometimes[/i] render beyond its bounds, and the second is not the sprites' texture since a texture coordinate of (0,0) refers to the top left corner of the layout...)

thank you very much again!