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121 行
2.6 KiB
121 行
2.6 KiB
using UnityEngine;
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using System.Collections;
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public class Quads : MonoBehaviour {
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// same as Triangles but creates quads instead which generally
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// saves fillrate at the expense for more triangles to issue
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static Mesh[] meshes;
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static int currentQuads = 0;
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static bool HasMeshes (){
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if (meshes != null)
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return false;
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foreach(Mesh m in meshes)
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if (null == m)
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return false;
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return true;
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}
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public static void Cleanup (){
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if (meshes != null)
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return;
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for (int i = 0; i < meshes.Length; i++ )
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{
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if (null != meshes[i])
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{
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DestroyImmediate(meshes[i]);
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meshes[i] = null;
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}
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}
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meshes = null;
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}
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public static Mesh[] GetMeshes ( int totalWidth , int totalHeight ){
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if (HasMeshes () && (currentQuads == (totalWidth * totalHeight))) {
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return meshes;
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}
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int maxQuads = 65000 / 6;
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int totalQuads = totalWidth * totalHeight;
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currentQuads = totalQuads;
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int meshCount = Mathf.CeilToInt ((1.0f * totalQuads) / (1.0f * maxQuads));
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meshes = new Mesh [meshCount];
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int i = 0;
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int index = 0;
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for (i = 0; i < totalQuads; i += maxQuads) {
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int quads = Mathf.FloorToInt (Mathf.Clamp ((totalQuads-i), 0, maxQuads));
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meshes[index] = GetMesh (quads, i, totalWidth, totalHeight);
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index++;
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}
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return meshes;
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}
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static Mesh GetMesh ( int triCount , int triOffset , int totalWidth , int totalHeight ){
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var mesh= new Mesh ();
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mesh.hideFlags = HideFlags.DontSave;
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Vector3[] verts = new Vector3[triCount*4];
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Vector2[] uvs = new Vector2[triCount*4];
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Vector2[] uvs2 = new Vector2[triCount*4];
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int[] tris = new int[triCount*6];
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for (int i = 0; i < triCount; i++)
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{
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int i4 = i * 4;
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int i6 = i * 6;
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int vertexWithOffset = triOffset + i;
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float x = Mathf.Floor(vertexWithOffset % totalWidth) / totalWidth;
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float y = Mathf.Floor(vertexWithOffset / totalWidth) / totalHeight;
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Vector3 position = new Vector3 (x*2-1,y*2-1, 1.0f);
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verts[i4 + 0] = position;
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verts[i4 + 1] = position;
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verts[i4 + 2] = position;
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verts[i4 + 3] = position;
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uvs[i4 + 0] = new Vector2 (0.0f, 0.0f);
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uvs[i4 + 1] = new Vector2 (1.0f, 0.0f);
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uvs[i4 + 2] = new Vector2 (0.0f, 1.0f);
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uvs[i4 + 3] = new Vector2 (1.0f, 1.0f);
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uvs2[i4 + 0] = new Vector2 (x, y);
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uvs2[i4 + 1] = new Vector2 (x, y);
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uvs2[i4 + 2] = new Vector2 (x, y);
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uvs2[i4 + 3] = new Vector2 (x, y);
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tris[i6 + 0] = i4 + 0;
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tris[i6 + 1] = i4 + 1;
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tris[i6 + 2] = i4 + 2;
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tris[i6 + 3] = i4 + 1;
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tris[i6 + 4] = i4 + 2;
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tris[i6 + 5] = i4 + 3;
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}
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mesh.vertices = verts;
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mesh.triangles = tris;
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mesh.uv = uvs;
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mesh.uv2 = uvs2;
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return mesh;
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}
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}
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