rendermonkey中的half-pixel offset

zhyinty

为什么rendermonkey的像素half-pixel offset 是
   Out.texCoord.x = 0.5 * (1 + Pos.x + viewport_inv_width);
   Out.texCoord.y = 0.5 * (1 - Pos.y + viewport_inv_height);

而不是

   Out.texCoord.x = 0.5 * (1 + Pos.x - viewport_inv_width);
   Out.texCoord.y = 0.5 * (1 - Pos.y - viewport_inv_height);