*

LEngine/MeshGenerator.cpp

@@ -0,0 +1,80 @@
+#include "MeshGenerator.h"
+#include <vector>
+
+void MeshGenerator::Cube(MeshPtr mesh, bool splitFaces){
+	if (mesh == nullptr) {
+		return;
+	}
+
+	std::vector<Vertex> vertices;
+	std::vector<uint32_t> indices;
+
+	float3 corners[8];
+	for (int i = 0; i < 2; ++i) {
+		for (int j = 0; j < 4; ++j) {
+			int id = i * 4 + j;
+			corners[id].x() = ((j == 0) || (j == 3)) ? -0.5f : 0.5f;
+			corners[id].y() = -((float)(j >> 1) - 0.5f);
+			corners[id].z() =(float)i - 0.5f;
+		}
+	}
+
+	int vid[] = { 0,1,2,3, 5,4,7,6, 1,5,6,2, 4,0,3,7, 4,5,1,0, 3,2,6,7 };
+	for (int i = 0; i < 24; ++i) {
+		Vertex v;
+		v.position.x() = corners[vid[i]].x();
+		v.position.y() = corners[vid[i]].y();
+		v.position.z() = corners[vid[i]].z();
+		vertices.push_back(v);
+	}
+
+	float3 normals[6] = { float3(0.0f,0.0f,-1.0f), float3(0.0f,0.0f,1.0f), float3(1.0f,0.0f,0.0f), float3(-1.0f,0.0f,0.0f), float3(0.0f,1.0f,0.0f), float3(0.0f,-1.0f,0.0f) };
+	int indicesBase[] = { 0,1,3,1,2,3 };
+	float2 uvBase[] = { float2(0.0f,0.0f), float2(1.0f,0.0f), float2(1.0f,1.0f), float2(0.0f,1.0f) };
+
+	mesh->SetSubmeshCount(splitFaces ? 6 : 1);
+
+	for (int i = 0; i < 6; ++i) {
+		for (int j = 0; j < 4; ++j) {
+			vertices[i * 4 + j].normal = normals[i];
+			vertices[i * 4 + j].uv0 = uvBase[j];
+		}
+
+		for (int j = 0; j < 6; ++j) {
+			indices.push_back(indicesBase[j] + i * 4);
+		}
+
+		if (splitFaces) {
+			mesh->SetIndices(indices, MeshTopology::TriangleList, i);
+			indices.resize(0);
+		}
+	}
+
+	mesh->SetVertices(vertices);
+	
+	if (!splitFaces) {
+		mesh->SetIndices(indices, MeshTopology::TriangleList, 0);
+	}
+}
+
+void MeshGenerator::Plane(MeshPtr mesh) {
+	if (mesh == nullptr) {
+		return;
+	}
+
+	float3 normal(0.0f, 1.0f, 0.0f);
+	float extend = 0.5f;
+
+	std::vector<Vertex> vertices = {
+		Vertex(float4(-extend, 0.0f,  extend, 1.0f), normal, float2(0.0f,0.0f)),
+		Vertex(float4(extend, 0.0f,  extend, 1.0f), normal, float2(1.0f,0.0f)),
+		Vertex(float4(extend, 0.0f, -extend, 1.0f), normal, float2(1.0f,1.0f)),
+		Vertex(float4(-extend, 0.0f, -extend, 1.0f), normal, float2(0.0f,1.0f)),
+	};
+
+	std::vector<uint32_t> indices = { 0,1,3,1,2,3 };
+
+	mesh->SetSubmeshCount(1);
+	mesh->SetVertices(vertices);
+	mesh->SetIndices(indices, MeshTopology::TriangleList, 0);
+}