1 using System;
2 using UnityEngine;
3 using Object = UnityEngine.Object;
4
5 // same as Triangles but creates quads instead which generally
6 // saves fillrate at the expense for more triangles to issue
7 namespace UnityStandardAssets.ImageEffects
8 {
9 class Quads
10 {
11 static Mesh[] meshes;
12 static int currentQuads = 0;
13
14 static bool HasMeshes ()
15 {
16 if (meshes == null)
17 return false;
18 foreach (Mesh m in meshes)
19 if (null == m)
20 return false;
21 return true;
22 }
23
24
25 public static void Cleanup ()
26 {
27 if (meshes == null)
28 return;
29
30 for (int i = 0; i < meshes.Length; i++)
31 {
32 if (null != meshes[i])
33 {
34 Object.DestroyImmediate (meshes[i]);
35 meshes[i] = null;
36 }
37 }
38 meshes = null;
39 }
40
41
42 public static Mesh[] GetMeshes ( int totalWidth, int totalHeight)
43 {
44 if (HasMeshes () && (currentQuads == (totalWidth * totalHeight))) {
45 return meshes;
46 }
47
48 int maxQuads = 65000 / 6;
49 int totalQuads = totalWidth * totalHeight;
50 currentQuads = totalQuads;
51
52 int meshCount = Mathf.CeilToInt ((1.0f * totalQuads) / (1.0f * maxQuads));
53
54 meshes = new Mesh [meshCount];
55
56 int i = 0;
57 int index = 0;
58 for (i = 0; i < totalQuads; i += maxQuads)
59 {
60 int quads = Mathf.FloorToInt (Mathf.Clamp ((totalQuads-i), 0, maxQuads));
61
62 meshes[index] = GetMesh (quads, i, totalWidth, totalHeight);
63 index++;
64 }
65
66 return meshes;
67 }
68
69 static Mesh GetMesh (int triCount, int triOffset, int totalWidth, int totalHeight)
70 {
71 var mesh = new Mesh ();
72 mesh.hideFlags = HideFlags.DontSave;
73
74 var verts = new Vector3[triCount * 4];
75 var uvs = new Vector2[triCount * 4];
76 var uvs2 = new Vector2[triCount * 4];
77 var tris = new int[triCount * 6];
78
79 for (int i = 0; i < triCount; i++)
80 {
81 int i4 = i * 4;
82 int i6 = i * 6;
83
84 int vertexWithOffset = triOffset + i;
85
86 float x = Mathf.Floor (vertexWithOffset % totalWidth) / totalWidth;
87 float y = Mathf.Floor (vertexWithOffset / totalWidth) / totalHeight;
88
89 Vector3 position = new Vector3 (x * 2 - 1, y * 2 - 1, 1.0f);
90
91 verts[i4 + 0] = position;
92 verts[i4 + 1] = position;
93 verts[i4 + 2] = position;
94 verts[i4 + 3] = position;
95
96 uvs[i4 + 0] = new Vector2 (0.0f, 0.0f);
97 uvs[i4 + 1] = new Vector2 (1.0f, 0.0f);
98 uvs[i4 + 2] = new Vector2 (0.0f, 1.0f);
99 uvs[i4 + 3] = new Vector2 (1.0f, 1.0f);
100
101 uvs2[i4 + 0] = new Vector2 (x, y);
102 uvs2[i4 + 1] = new Vector2 (x, y);
103 uvs2[i4 + 2] = new Vector2 (x, y);
104 uvs2[i4 + 3] = new Vector2 (x, y);
105
106 tris[i6 + 0] = i4 + 0;
107 tris[i6 + 1] = i4 + 1;
108 tris[i6 + 2] = i4 + 2;
109
110 tris[i6 + 3] = i4 + 1;
111 tris[i6 + 4] = i4 + 2;
112 tris[i6 + 5] = i4 + 3;
113
114 }
115
116 mesh.vertices = verts;
117 mesh.triangles = tris;
118 mesh.uv = uvs;
119 mesh.uv2 = uvs2;
120
121 return mesh;
122 }
123
124 }
125 }
