📄 hgedata_vertex.html
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<h1 style="margin-top:0px">HGE Vertex structure</h1>
<p>
<b>T</b>he <b>hgeVertex</b> structure is used to describe vertices from which a quad consists.
</p>
<pre>
struct hgeVertex
{
float <b>x</b>, <b>y</b>;
float <b>z</b>;
float <b>reserved</b>;
DWORD <b>col</b>;
float <b>tx</b>, <b>ty</b>;
};
</pre>
<h2>Members</h2>
<dl>
<dt>x
<dd>Screen X-coordinate.
<dt>y
<dd>Screen Y-coordinate.
<dt>z
<dd>The vertex Z-order ranging from 0.0 to 1.0. If Z-buffer isn't used,<br>
the value is ignored.
<dt>reserved
<dd>Reserved field, stands for <b>DirectX</b> "reciprocal homogeneous W".<br>
Must be always 1.0.
<dt>col
<dd>The vertex color and opacity.
<dt>tx
<dd>The texture X-coordinate in range 0.0 to 1.0.
<dt>ty
<dd>The texture Y-coordinate in range 0.0 to 1.0.
</dl>
<h2>Remarks</h2>
<p>
<b>DirectX</b> treats texture coordinates relative to the top-left corner
of a texel, and it treats screen coordinates relative
to a pixel's center. So, to render a part of texture to the screen with
exact texel to pixel mapping (without affecting it by interpolation),
just shift all your vertices screen coordinates by -0.5.
<br><br>
If you specify values outside the 0.0-1.0 range for the texture coordinates,
the texture data will be repeated on every integer junction. For example,
it is an easy way to implement "rotozoom" effect.
</p>
<h2>Requirements</h2>
<p>
<b>Header:</b> hge.h
</p>
<h2>See also</h2>
<p>
<a href="hgedata_quad.html">Quad structure</a>,
<a href="hgedata_hwcolor.html">Hardware color format</a>
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