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