3D-Program-with-D3D/MeshGeometry.cpp at master · floatyears/3D-Program-with-D3D · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
#include "MeshGeometry.h"


MeshGeometry::MeshGeometry():mVB(0),mIB(0),mIndexBufferFormat(DXGI_FORMAT_R16_UINT),mVertexStride(0)
{
}


MeshGeometry::~MeshGeometry(void)
{
	ReleaseCOM(mVB);
	ReleaseCOM(mIB);
}

void MeshGeometry::SetIndices(ID3D11Device* device, const USHORT* indices, UINT count)
{
	D3D11_BUFFER_DESC ibd;
	ibd.Usage = D3D11_USAGE_IMMUTABLE;
	ibd.ByteWidth = sizeof(USHORT)*count;
	ibd.BindFlags = D3D11_BIND_INDEX_BUFFER;
	ibd.CPUAccessFlags = 0;
	ibd.MiscFlags = 0;
	ibd.StructureByteStride = 0;

	D3D11_SUBRESOURCE_DATA iinitData;
	iinitData.pSysMem = indices;

	HR(device->CreateBuffer(&ibd,&iinitData,&mIB));
}


void MeshGeometry::SetSubsetTable(std::vector<MeshGeometry::Subset>& subsetTable)
{
	mSubsetTable = subsetTable;
}

void MeshGeometry::Draw(ID3D11DeviceContext* dc, UINT subsetId)
{
	UINT offset = 0;

	dc->IASetVertexBuffers(0,1,&mVB,&mVertexStride,&offset);
	dc->IASetIndexBuffer(mIB,mIndexBufferFormat,0);

	dc->DrawIndexed(mSubsetTable[subsetId].FaceCount*3,mSubsetTable[subsetId].FaceStart*3,0);
}