Geometry

Geometry

• 정점/인덱스를 관리하는 템플릿 컨테이너
• "정점 배열 + 인덱스 배열"을 들고 있는 CPU 쪽 지오메트리 컨테이너

#pragma once

template <typename T>
class Geometry
{
public:
	Geometry() {}
	~Geometry() {}

	uint32 GetVertexCount() { return static_cast<uint32>(_vertices.size()); }
	void* GetVertexData() { return _vertices.date(); }
	const vector<T>& GetVertices() { return _vertices; }

	uint32 GetIndexCount() { return static_cast<uint32>(_indices.size()); }
	void* GetIndexData() { return _indices.data(); }
	const vector<uint32>& GetIndices() { return _indices; }


	// 정점 추가
	void AddVertex(const T& vertex) { _vertices.push_back(vertex); }
	void AddVertices(const vector<T>& vertices) {_vertices.insert(_vertices.end(), vertices.begin(), vertices.end());}
	void SetVertices(const vector<T>& vertices) { _vertices = vertices; }


	void AddIndex(uint32 index) { _indices.push_back(index); }
	void AddIndices(const vector<uint32>& indices) { _indices.insert(_indices.end(), indices.begin(), indices.end()); }
	void SetIndices(const vector<uint32>& indices) { _indices = indices; }

private:

	vector<T> _vertices;
	vector<uint32> _indices;
};

• Geometry<T>는 정점 타입에 상관없이 재사용할 수 있도록 템플릿으로 설계

GeometryHelpers

• 사각형 지오메트리 생성기
• 자주 쓰는 도형을 간단한 함수 호출로 만들어주는 헬퍼

#include "pch.h"
#include "GeometryHelper.h"

void GeometryHelper::CreateRectangle(shared_ptr<Geometry<VertexTextureData>> geometry)
{
	vector<VertexTextureData> vertices;

	vertices.resize(4);


	vertices[0].position = Vec3(-0.5f, -0.5f, 0.f);
	vertices[0].uv = Vec2(0.f, 1.f);

	vertices[1].position = Vec3(-0.5f, 0.5f, 0.f);
	vertices[1].uv = Vec2(0.f, 0.f);

	vertices[2].position = Vec3(0.5f, -0.5f, 0.f);
	vertices[2].uv = Vec2(1.f, 1.f);

	vertices[3].position = Vec3(0.5f, 0.5f, 0.f);
	vertices[3].uv = Vec2(1.f, 0.f);

	geometry->SetVertices(vertices);


	vector<uint32> indices = { 0, 1, 2, 2, 1, 3 };
	geometry->SetIndices(indices);
}

void GeometryHelper::CreateRectangle(shared_ptr<Geometry<VertexColorData>> geometry, Color color)
{
	vector<VertexColorData> vertices;

	vertices.resize(4);


	vertices[0].position = Vec3(-0.5f, -0.5f, 0.f);
	vertices[0].color = color;

	vertices[1].position = Vec3(-0.5f, 0.5f, 0.f);
	vertices[1].color = color;

	vertices[2].position = Vec3(0.5f, -0.5f, 0.f);
	vertices[2].color = color;

	vertices[3].position = Vec3(0.5f, 0.5f, 0.f);
	vertices[3].color = color;

	geometry->SetVertices(vertices);


	vector<uint32> indices = { 0, 1, 2, 2, 1, 3 };
	geometry->SetIndices(indices);
}

VertexData

• 정점 구조 + Input Layout 정의

#pragma once


struct VertexTextureData
{
	Vec3 position = { 0, 0, 0 };
	Vec2 uv = { 0, 0 };

	static vector<D3D11_INPUT_ELEMENT_DESC> descs;
};

struct VertexColorData
{
	Vec3 position = { 0, 0, 0 };
	Color color = { 0, 0, 0, 0 };

	static vector<D3D11_INPUT_ELEMENT_DESC> descs;
};

#include "pch.h"
#include "VertexData.h"

vector<D3D11_INPUT_ELEMENT_DESC> VertexTextureData::descs =
{
	// 의미, 인덱스, 포맷, 입력슬롯, 오프셋, 데이터종류, 인스턴스 데이터 스텝률
	{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
	// 12 : Position이 0 ~ 11오프셋에 있고 12부터 Color가 시작
	//{ "COLOR", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0 },
	{ "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
};

vector<D3D11_INPUT_ELEMENT_DESC> VertexColorData::descs =
{
	{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
	{ "COLOR", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0 },
};