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Mesh.cpp
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Mesh.cpp
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#include "mesh.h"
CMesh::CMesh(IDirect3DDevice9* p_pDX3D)
{
m_iPrimitivesCount = 0;
m_pPrimitives = NULL;
m_p3DDevice = p_pDX3D;
}
CMesh::~CMesh(void)
{
ReleaseBuffers();
}
HRESULT CMesh::Draw()
{
HRESULT hr;
if(!m_pPrimitives || !m_iPrimitivesCount)
return S_FALSE;
_rwD3D9SetFVF(D3DFVF_GRAPH3DVERTEX);
RwD3D9SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);
for(int i = 0; i < m_iPrimitivesCount; i++){
RwD3D9SetStreamSource(0, m_pPrimitives[i].VertexBuffer, 0,
sizeof(GRAPH3DVERTEXSTRUCT));
_rwD3D9DrawPrimitive(m_pPrimitives[i].PrimitiveType,
0, m_pPrimitives[i].dwPrimitiveCount);
}
RwD3D9SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
return S_OK;
}
HRESULT CMesh::CreateVertexBuffers(int p_iPrimitivesCount)
{
HRESULT hr;
if(!m_pPrimitives || m_iPrimitivesCount < p_iPrimitivesCount)
return S_FALSE;
for(int i = 0; i < p_iPrimitivesCount; i++){
m_pPrimitives[i].dwVertexCount =
CalcVertexCount(m_pPrimitives[i].PrimitiveType, m_pPrimitives[i].dwPrimitiveCount);
hr = m_p3DDevice->CreateVertexBuffer(
sizeof(GRAPH3DVERTEXSTRUCT) * m_pPrimitives[i].dwVertexCount,
0, D3DFVF_GRAPH3DVERTEX,
D3DPOOL_MANAGED/*D3DPOOL_DEFAULT*/, &m_pPrimitives[i].VertexBuffer, NULL);
if(FAILED(hr)){
ReleaseBuffers();
break;
}
}
return hr;
}
DWORD CMesh::CalcVertexCount(D3DPRIMITIVETYPE p_PrimitiveType, DWORD p_dwPrimitiveCount)
{
switch(p_PrimitiveType){
case D3DPT_POINTLIST:
return p_dwPrimitiveCount;
case D3DPT_LINELIST:
return p_dwPrimitiveCount * 2;
case D3DPT_LINESTRIP:
return p_dwPrimitiveCount + 1;
case D3DPT_TRIANGLELIST:
return p_dwPrimitiveCount * 3;
case D3DPT_TRIANGLESTRIP:
return p_dwPrimitiveCount + 2;
case D3DPT_TRIANGLEFAN:
return p_dwPrimitiveCount + 2;
default:
return 0;
};
}
void CMesh::CalcSphereVertex(float p_fPitch, float p_fYaw, float p_fRadius,
GRAPH3DVERTEXSTRUCT* p_pVertex,
bool bSetNormal, bool bSetTexture)
{
float cospitch = cos(p_fPitch);
float sinpitch = sin(p_fPitch);
float cosyaw = cos(p_fYaw);
float sinyaw = sin(p_fYaw);
float r = p_fRadius * cospitch;
p_pVertex->z = p_fRadius * sinpitch;
p_pVertex->x = r * cosyaw;
p_pVertex->y = r * sinyaw;
/*p_pVertex->nz = sinpitch;
p_pVertex->nx = cospitch * cosyaw;
p_pVertex->ny = cospitch * sinyaw;*/
p_pVertex->tv = (p_fPitch + D3DXToRadian(90)) / D3DXToRadian(180);
p_pVertex->tu = p_fYaw / D3DXToRadian(360);
}
HRESULT CMesh::CreateSphere(float p_fRadius, unsigned int p_iSteps,
bool p_bUseNormals, bool p_bUseTexture)
{
float pi = 3.1415926535f;
ReleaseBuffers();
m_pPrimitives = new PRIMITIVESTRUCT[3];
if(!m_pPrimitives)
return ERROR_NOT_ENOUGH_MEMORY;
m_iPrimitivesCount = 3;
// Sphere Bottom
m_pPrimitives[0].PrimitiveType = D3DPT_TRIANGLEFAN;
m_pPrimitives[0].dwPrimitiveCount = 2 * p_iSteps;
// Sphere Middle
m_pPrimitives[1].PrimitiveType = D3DPT_TRIANGLESTRIP;
m_pPrimitives[1].dwPrimitiveCount = 4 * p_iSteps * (p_iSteps - 2);
// Sphere Top
m_pPrimitives[2].PrimitiveType = D3DPT_TRIANGLEFAN;
m_pPrimitives[2].dwPrimitiveCount = 2 * p_iSteps;
HRESULT hr = CreateVertexBuffers(3);
if(FAILED(hr)){
ReleaseBuffers(); // Buffers have already been released
return hr;
}
float anglestep = pi / p_iSteps;
GRAPH3DVERTEXSTRUCT* pData;
// Sphere Bottom
hr = m_pPrimitives[0].VertexBuffer->Lock(0, 0, (void**)&pData, 0);
if (FAILED(hr)) {
return hr;
}
// Bottom Vertex
CalcSphereVertex(-pi / 2, 0, p_fRadius, pData);
// Rest of triangle fan vertexes
for(int i = p_iSteps * 2; i >= 0; i--){
CalcSphereVertex(- pi / 2 + anglestep,
anglestep * i, p_fRadius,
&pData[p_iSteps * 2 - i + 1]);
}
hr = m_pPrimitives[0].VertexBuffer->Unlock();
if(FAILED(hr)){
return hr;
}
// Sphere Middle
hr = m_pPrimitives[1].VertexBuffer->Lock(0, 0, (void**)&pData, 0);
if(FAILED(hr)){
return hr;
}
DWORD v = 0; // vertex index
// First vertex of triangle strip
CalcSphereVertex(-pi / 2 + 1 * anglestep, 0, p_fRadius,
&pData[v++]);
// Rest of triangle strip vertexes
for(unsigned int i = 1; i < p_iSteps - 1; i++){
for(unsigned int j = 1; j <= 2 * p_iSteps; j++){
CalcSphereVertex(-pi / 2 + i * anglestep,
(i - 1) * 2 * pi + j * anglestep,
p_fRadius, &pData[v++]);
CalcSphereVertex(-pi / 2 + (i + 1) * anglestep,
(i - 1) * 2 * pi + j * anglestep,
p_fRadius, &pData[v++]);
}
}
// Last vertex of triangle strip
CalcSphereVertex(pi / 2 - anglestep, anglestep, p_fRadius,
&pData[v++]);
m_pPrimitives[1].VertexBuffer->Unlock();
if(FAILED(hr)){
return hr;
}
// Sphere Top
hr = m_pPrimitives[2].VertexBuffer->Lock(0, 0, (void**)&pData, 0);
if(FAILED(hr)){
return hr;
}
// Top Vertex
CalcSphereVertex(pi / 2, 0, p_fRadius, pData);
// Rest of triangle fan vertexes
for(unsigned int i = 0; i <= p_iSteps * 2; i++){
CalcSphereVertex(pi / 2 - anglestep,
anglestep * i, p_fRadius, &pData[i + 1]);
}
m_pPrimitives[2].VertexBuffer->Unlock();
if(FAILED(hr)){
return hr;
}
return S_OK;
}
void CMesh::ReleaseBuffers()
{
if (m_pPrimitives) {
for(int i = 0; i < m_iPrimitivesCount; i++){
if(m_pPrimitives[i].VertexBuffer)
m_pPrimitives[i].VertexBuffer->Release();
}
delete[] m_pPrimitives;
}
m_pPrimitives = NULL;
m_iPrimitivesCount = 0;
}