public static Bullet Spawn(float2 position, int seed, int bulletTypeIndex = 0)
{
var hash = new Klak.Math.XXHash((uint)seed);
var rotation = hash.Float(math.PI * 2, 0u);
var speed = hash.Float(0.1f, 0.5f, 1u);
return(new Bullet(position, rotation, speed, bulletTypeIndex));
}
public static Bullet Spawn(float2 position, int seed)
{
var hash = new Klak.Math.XXHash((uint)seed);
var angle = hash.Float(math.PI * 2, 0u);
var speed = hash.Float(0.05f, 0.2f, 1u);
return(new Bullet(position,
math.float2(math.cos(angle),
math.sin(angle)) * speed));
}
public void Execute(int i)
{
var hash = new Klak.Math.XXHash((uint)i);
// Indices
var i1 = (int)Idx[i * 3 + 0];
var i2 = (int)Idx[i * 3 + 1];
var i3 = (int)Idx[i * 3 + 2];
// Vertex positions with transformation
var p1 = math.mul(Xfm, math.float4(Pos[i1], 1)).xyz;
var p2 = math.mul(Xfm, math.float4(Pos[i2], 1)).xyz;
var p3 = math.mul(Xfm, math.float4(Pos[i3], 1)).xyz;
// Triangle centroid
var pc = (p1 + p2 + p3) / 3;
// Effect select
var sel = hash.Float(8394) < 0.1f;
// Effect parameter
var eff = math.mul(Eff, math.float4(pc, 1)).z;
eff = math.saturate(eff + hash.Float(0, 0.1f, 2058));
// Deformation parameter
var mod = (1 - math.cos(eff * math.PI * 4)) / 2;
// Triangle scaling
if (sel)
{
var scale = math.pow(hash.Float(84792), 8);
scale = 1 + mod * math.lerp(5, 25, scale);
p1 = math.lerp(pc, p1, scale);
p2 = math.lerp(pc, p2, scale);
p3 = math.lerp(pc, p3, scale);
}
// Normal/Tangent
var nrm = MathUtil.UnitOrtho(p2 - p1, p3 - p1);
var tan = MathUtil.AdHocTangent(nrm);
// UV coordinates
var mat = (eff > 0.25f && eff < 0.75f) ? 1.0f : 0.0f;
var emm = (sel ? math.pow(mod, 20) * 2 : 0) - mat;
var uv1 = math.float4(UV0[i1], mat, math.clamp(emm, -1, 1));
var uv2 = math.float4(UV0[i2], uv1.zw);
var uv3 = math.float4(UV0[i3], uv1.zw);
// Output
Out[i] = new Triangle(new Vertex(p1, nrm, tan, uv1),
new Vertex(p2, nrm, tan, uv2),
new Vertex(p3, nrm, tan, uv3));
}
