/// <summary>
/// Adds triangle indices for a quad
/// </summary>
public static void AddIndices(this RenderBuffer target, int offset, bool backFace)
{
// 0--1
// |\ |
// | \|
// 3--2
if (backFace)
{
target.Triangles.Add(offset + 2);
target.Triangles.Add(offset + 0);
target.Triangles.Add(offset + 1);
target.Triangles.Add(offset + 3);
target.Triangles.Add(offset + 0);
target.Triangles.Add(offset + 2);
}
else
{
target.Triangles.Add(offset + 2);
target.Triangles.Add(offset + 1);
target.Triangles.Add(offset + 0);
target.Triangles.Add(offset + 3);
target.Triangles.Add(offset + 2);
target.Triangles.Add(offset + 0);
}
}
public MiniChunk(Chunk parentChunk, int positionY)
{
m_parentChunk = parentChunk;
OffsetY = positionY * EngineSettings.ChunkConfig.SizeY;
m_drawCallBatcher = new DrawCallBatcher();
SolidRenderBuffer = new RenderBuffer();
BBoxVertices = new List<Vector3>();
BBoxVerticesTransformed = new List<Vector3>();
Reset();
}
/// <summary>
/// Copy the data to a Unity mesh
/// </summary>
public void BuildMesh(UnityEngine.Mesh mesh, RenderBuffer buffer)
{
int size = buffer.Vertices.Count;
// Avoid allocations by retrieving buffers from the pool
Vector3[] vertices = Globals.Pools.PopVector3Array(size);
Vector2[] uvs = Globals.Pools.PopVector2Array(size);
Color32[] colors = Globals.Pools.PopColor32Array(size);
Vector3[] normals = Globals.Pools.PopVector3Array(size);
Vector4[] tangents = Globals.Pools.PopVector4Array(size);
// Fill buffers with data
for (int i = 0; i < size; i++)
{
VertexData vertexData = buffer.Vertices[i];
vertices[i] = vertexData.Vertex;
uvs[i] = vertexData.UV;
colors[i] = vertexData.Color;
normals[i] = vertexData.Normal;
tangents[i] = vertexData.Tangent;
}
// Due to the way the memory pools work we might have received more
// data than necessary. This little overhead is well worth it, though.
// Fill unused data with "zeroes"
for (int i = size; i < vertices.Length; i++)
{
vertices[i] = Vector3.zero;
uvs[i] = Vector2.zero;
colors[i] = Color.clear;
normals[i] = Vector3.zero;
tangents[i] = Vector4.zero;
}
// Prepare mesh
mesh.vertices = vertices;
mesh.uv = uvs;
mesh.colors32 = colors;
mesh.normals = normals;
mesh.tangents = tangents;
mesh.SetTriangles(buffer.Triangles, 0);
mesh.Optimize();
// Return memory back to pool
Globals.Pools.PushVector3Array(vertices);
Globals.Pools.PushVector2Array(uvs);
Globals.Pools.PushColor32Array(colors);
Globals.Pools.PushVector3Array(normals);
Globals.Pools.PushVector4Array(tangents);
}
public static void GenerateTangents(this RenderBuffer buffer, LocalPools pools)
{
var vertices = buffer.Vertices;
var triangles = buffer.Triangles;
var tan1 = pools.PopVector3Array(vertices.Count);
var tan2 = pools.PopVector3Array(vertices.Count);
for (int t = 0; t < triangles.Count; t += 3)
{
int i1 = triangles[t + 0];
int i2 = triangles[t + 1];
int i3 = triangles[t + 2];
VertexData vd1 = vertices[i1];
VertexData vd2 = vertices[i2];
VertexData vd3 = vertices[i3];
Vector3 v1 = vd1.Vertex;
Vector3 v2 = vd2.Vertex;
Vector3 v3 = vd3.Vertex;
Vector2 w1 = vd1.UV;
Vector2 w2 = vd2.UV;
Vector2 w3 = vd3.UV;
float x1 = v2.x - v1.x;
float y1 = v2.y - v1.y;
float z1 = v2.z - v1.z;
float x2 = v3.x - v1.x;
float y2 = v3.y - v1.y;
float z2 = v3.z - v1.z;
float s1 = w2.x - w1.x;
float s2 = w3.x - w1.x;
float t1 = w2.y - w1.y;
float t2 = w3.y - w1.y;
// Avoid division by zero
float div = s1 * t2 - s2 * t1;
float r = (Mathf.Abs(div) > Mathf.Epsilon) ? (1f / div) : 0f;
Vector3 sdir = new Vector3((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r, (t2 * z1 - t1 * z2) * r);
Vector3 tdir = new Vector3((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r, (s1 * z2 - s2 * z1) * r);
tan1[i1] += sdir;
tan1[i2] += sdir;
tan1[i3] += sdir;
tan2[i1] += tdir;
tan2[i2] += tdir;
tan2[i3] += tdir;
}
for (int v = 0; v < vertices.Count; ++v)
{
VertexData vd = vertices[v];
Vector3 n = vd.Normal;
Vector3 t = tan1[v];
//Vector3 tmp = (t - n*Vector3.Dot(n, t)).normalized;
//tangents[v] = new Vector4(tmp.x, tmp.y, tmp.z);
Vector3.OrthoNormalize(ref n, ref t);
vd.Tangent = new Vector4(
t.x, t.y, t.z,
(Vector3.Dot(Vector3.Cross(n, t), tan2[v]) < 0.0f) ? -1.0f : 1.0f
);
tan1[v] = Vector3.zero;
tan2[v] = Vector3.zero;
}
pools.PushVector3Array(tan1);
pools.PushVector3Array(tan2);
}
public static void AddVertex(this RenderBuffer target, VertexData vertex)
{
target.Vertices.Add(vertex);
}
/// <summary>
/// Adds the vertices to the render buffer.
/// </summary>
public static void AddVertices(this RenderBuffer target, VertexData[] vertices)
{
target.Vertices.AddRange(vertices);
}