public render_texuv br; // bottom-right UV coordinate
public render_quad_texuv(render_quad_texuv other)
{
tl = other.tl;
tr = other.tr;
bl = other.bl;
br = other.br;
}
/*-------------------------------------------------
* render_clip_quad - clip a quad to a rectangle
* -------------------------------------------------*/
public static bool render_clip_quad(ref render_bounds bounds, render_bounds clip, ref render_quad_texuv texcoords, bool use_texcoords)
{
/* ensure our assumptions about the bounds are correct */
assert(bounds.x0 <= bounds.x1);
assert(bounds.y0 <= bounds.y1);
/* trivial reject */
if (bounds.y1 < clip.y0)
{
return(true);
}
if (bounds.y0 > clip.y1)
{
return(true);
}
if (bounds.x1 < clip.x0)
{
return(true);
}
if (bounds.x0 > clip.x1)
{
return(true);
}
/* clip top (x0,y0)-(x1,y1) */
if (bounds.y0 < clip.y0)
{
float frac = (clip.y0 - bounds.y0) / (bounds.y1 - bounds.y0);
bounds.y0 = clip.y0;
if (use_texcoords) //if (texcoords != nullptr)
{
texcoords.tl.u += (texcoords.bl.u - texcoords.tl.u) * frac;
texcoords.tl.v += (texcoords.bl.v - texcoords.tl.v) * frac;
texcoords.tr.u += (texcoords.br.u - texcoords.tr.u) * frac;
texcoords.tr.v += (texcoords.br.v - texcoords.tr.v) * frac;
}
}
/* clip bottom (x3,y3)-(x2,y2) */
if (bounds.y1 > clip.y1)
{
float frac = (bounds.y1 - clip.y1) / (bounds.y1 - bounds.y0);
bounds.y1 = clip.y1;
if (use_texcoords) //if (texcoords != nullptr)
{
texcoords.bl.u -= (texcoords.bl.u - texcoords.tl.u) * frac;
texcoords.bl.v -= (texcoords.bl.v - texcoords.tl.v) * frac;
texcoords.br.u -= (texcoords.br.u - texcoords.tr.u) * frac;
texcoords.br.v -= (texcoords.br.v - texcoords.tr.v) * frac;
}
}
/* clip left (x0,y0)-(x3,y3) */
if (bounds.x0 < clip.x0)
{
float frac = (clip.x0 - bounds.x0) / (bounds.x1 - bounds.x0);
bounds.x0 = clip.x0;
if (use_texcoords) //if (texcoords != nullptr)
{
texcoords.tl.u += (texcoords.tr.u - texcoords.tl.u) * frac;
texcoords.tl.v += (texcoords.tr.v - texcoords.tl.v) * frac;
texcoords.bl.u += (texcoords.br.u - texcoords.bl.u) * frac;
texcoords.bl.v += (texcoords.br.v - texcoords.bl.v) * frac;
}
}
/* clip right (x1,y1)-(x2,y2) */
if (bounds.x1 > clip.x1)
{
float frac = (bounds.x1 - clip.x1) / (bounds.x1 - bounds.x0);
bounds.x1 = clip.x1;
if (use_texcoords) //if (texcoords != nullptr)
{
texcoords.tr.u -= (texcoords.tr.u - texcoords.tl.u) * frac;
texcoords.tr.v -= (texcoords.tr.v - texcoords.tl.v) * frac;
texcoords.br.u -= (texcoords.br.u - texcoords.bl.u) * frac;
texcoords.br.v -= (texcoords.br.v - texcoords.bl.v) * frac;
}
}
return(false);
}
