RenderBitmapCircle (funcion para cargar Texturas Cuadradas como Circulos Perfectos en pantalla)

void RenderBitmapCircle(int Texture, float x, float y, float Radius)
{
    float tx, ty;

    float xcos, ysin;

    float Angle, Radian;

    BindTexture(Texture);

    glBegin(GL_POLYGON);

    for(Angle=0.0;Angle<=360.0;Angle+=2.0)
    {
	Radian = Angle * (Q_PI/180.0f);

	xcos = cosf(Radian);
	ysin = sinf(Radian);

	x = xcos * Radius + x;
	y = ysin * Radius + y;

	tx = xcos * 0.5f + 0.5f;
	ty = ysin * 0.5f + 0.5f;

	glTexCoord2f(tx, ty);
	glVertex2f(x, y);
    }

    glEnd();
}