1 using System;
2 using UnityEngine;
3 using Object = UnityEngine.Object;
4
5 namespace UnityStandardAssets.ImageEffects
6 {
7 class Triangles
8 {
9 private static Mesh[] meshes;
10 private static int currentTris = 0;
11
12 static bool HasMeshes()
13 {
14 if (meshes == null)
15 return false;
16 for (int i = 0; i < meshes.Length; i++)
17 if (null == meshes[i])
18 return false;
19
20 return true;
21 }
22
23 static void Cleanup()
24 {
25 if (meshes == null)
26 return;
27
28 for (int i = 0; i < meshes.Length; i++)
29 {
30 if (null != meshes[i])
31 {
32 Object.DestroyImmediate(meshes[i]);
33 meshes[i] = null;
34 }
35 }
36 meshes = null;
37 }
38
39 static Mesh[] GetMeshes(int totalWidth, int totalHeight)
40 {
41 if (HasMeshes() && (currentTris == (totalWidth * totalHeight)))
42 {
43 return meshes;
44 }
45
46 int maxTris = 65000 / 3;
47 int totalTris = totalWidth * totalHeight;
48 currentTris = totalTris;
49
50 int meshCount = Mathf.CeilToInt((1.0f * totalTris) / (1.0f * maxTris));
51
52 meshes = new Mesh[meshCount];
53
54 int i = 0;
55 int index = 0;
56 for (i = 0; i < totalTris; i += maxTris)
57 {
58 int tris = Mathf.FloorToInt(Mathf.Clamp((totalTris - i), 0, maxTris));
59
60 meshes[index] = GetMesh(tris, i, totalWidth, totalHeight);
61 index++;
62 }
63
64 return meshes;
65 }
66
67 static Mesh GetMesh(int triCount, int triOffset, int totalWidth, int totalHeight)
68 {
69 var mesh = new Mesh();
70 mesh.hideFlags = HideFlags.DontSave;
71
72 var verts = new Vector3[triCount * 3];
73 var uvs = new Vector2[triCount * 3];
74 var uvs2 = new Vector2[triCount * 3];
75 var tris = new int[triCount * 3];
76
77 for (int i = 0; i < triCount; i++)
78 {
79 int i3 = i * 3;
80 int vertexWithOffset = triOffset + i;
81
82 float x = Mathf.Floor(vertexWithOffset % totalWidth) / totalWidth;
83 float y = Mathf.Floor(vertexWithOffset / totalWidth) / totalHeight;
84
85 Vector3 position = new Vector3(x * 2 - 1, y * 2 - 1, 1.0f);
86
87 verts[i3 + 0] = position;
88 verts[i3 + 1] = position;
89 verts[i3 + 2] = position;
90
91 uvs[i3 + 0] = new Vector2(0.0f, 0.0f);
92 uvs[i3 + 1] = new Vector2(1.0f, 0.0f);
93 uvs[i3 + 2] = new Vector2(0.0f, 1.0f);
94
95 uvs2[i3 + 0] = new Vector2(x, y);
96 uvs2[i3 + 1] = new Vector2(x, y);
97 uvs2[i3 + 2] = new Vector2(x, y);
98
99 tris[i3 + 0] = i3 + 0;
100 tris[i3 + 1] = i3 + 1;
101 tris[i3 + 2] = i3 + 2;
102 }
103
104 mesh.vertices = verts;
105 mesh.triangles = tris;
106 mesh.uv = uvs;
107 mesh.uv2 = uvs2;
108
109 return mesh;
110 }
111 }
112 }
