3DShader之位移贴图(Displacement Mapping)
3DShader之移位贴图(Displacement Mapping)
我们知道法线贴图是只是改了物体的法线属性,用来计算光照,但是并没有改变物体本身的网格.但是移位贴图就不一样了,它会移动物体的顶点.我用移位贴图做了个海洋,好了,上了图再讲:
注意看海的边缘的顶点,已经实现了移动
最后,添加了一个笛卡尔转球形坐标的函数将其转为球形坐标,到时候我会提供球形版本的源码,如果需要平面的只需要在shader将调用这个函数的语句注释掉即可.
好了,不啰嗦了,困得不行了!
类似于法线贴图，移位贴图的每一个纹素中存储了一个向量，这个向量代表了对应顶点的位移。
注意，此处的纹素并不是与像素一一对应，而是与顶点一一对应，因此，纹理的纹素个数与网格的顶点个数是相等的。为什么必须相等,源代码里写
了原因的
在VS阶段，需要获取每个顶点对应的纹素中的位移向量. 注意只有3.0版本以上的vs才支持在VS阶段获取纹理数据，之前的版本只有ps才能获取纹理数据
好了,讲下这个项目的大概原理
这个项目,有两张移位纹理和两张法线纹理,目的就是为了进一步随机化.所以跟这里的实质内容关系不大,我会把它当成一张来讲
移位纹理可以存储需要移位的向量,而我们这里只存储了一个r通道,g,b通道都为1,所以我们的移位纹理储存的是[0,255]的随机值,注意移位纹理是128*128的,其实就是一个128*128的高度图.用的就是这个高度图去波动128*128网格的顶点的y值,当然采样高度图的坐标是移动的.
移动了顶点的y坐标,前面我们在法线贴图也提到过可以通过高度图生成法线纹理,这里一样,通过变化后的Y坐标也可以生成这个点的法向量.
这个法向量就用来算光照.当然这样算出来的光照很粗略,如下图所示:
所以,法线贴图又来了,这个是为了增加细节效果的,跟移位没有点关系,具体的方法是:将摄像机,灯光全转换到顶点的切线空间,然后通过纹理坐标对法线纹理进行采样,然后再以这三个变量来算光照.注意项目中的采样法线纹理的坐标经过缩放的,它重复了8次.
加上细节后:
好了,贴源代码
/*------------------------
DisplacementMapping.fx -- achieve displacement mapping
(c) Seamanj.2013/9/1
------------------------*/
#include "DXUT.h"
#include "resource.h"
// phase1 : add camera
// phase2 : add sky box
// phase3 : add grid mesh
// phase4 : add FX
#define phase1 1
#define phase2 1
#define phase3 1
#define phase4 1
#if phase1
#include "DXUTcamera.h"
CFirstPersonCamera g_Camera;
#endif
#if phase2
// Vertex Buffer
LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL;
// Index Buffer
LPDIRECT3DINDEXBUFFER9 g_pIB = NULL;
PDIRECT3DCUBETEXTURE9 g_pCubeTex = 0;
#endif
#if phase3
#include <vector>
int g_iVerticesNumPerRow = 128;
int g_iVerticesNumPerCol = 128;
//注意:这里的尺寸一定要给位移图片的大小一样,我原本也想过用129个顶点(第0到第128个),然后将第0和第128
//顶点的坐标和纹理都设为一样,纹理坐标u坐标设为0,这样是不行的,虽然看上去纹理重合,但并不是每一个顶点
//对应一个点,必然会有一个纹理坐标重合,这样就破坏了纹理的连续性,就相当于把纹理从中拉开了一个距离
//出来一样,并且这个距离平行U方向的颜色都一样.所以一旦位移纹理偏移就不会连续了,同理如果只有127个点
//那么纹理也会失去连续性
float g_fDeltaX = 0.25f;
float g_fDeltaZ = 0.25f;
const float EPSILON = 0.001f;
IDirect3DVertexDeclaration9* g_pVertexDecl;
ID3DXMesh* g_pMesh;
// The two normal maps to scroll.
IDirect3DTexture9* g_pNormalTex1;
IDirect3DTexture9* g_pNormalTex2;
// The two displacement maps to scroll.
IDirect3DTexture9* g_pDisplacementTex1;
IDirect3DTexture9* g_pDisplacementTex2;
//===============================================================
// Colors and Materials
const D3DXCOLOR WHITE(1.0f, 1.0f, 1.0f, 1.0f);
const D3DXCOLOR BLACK(0.0f, 0.0f, 0.0f, 1.0f);
const D3DXCOLOR RED(1.0f, 0.0f, 0.0f, 1.0f);
const D3DXCOLOR GREEN(0.0f, 1.0f, 0.0f, 1.0f);
const D3DXCOLOR BLUE(0.0f, 0.0f, 1.0f, 1.0f);
struct DirectionalLight
{
D3DXCOLOR ambient;
D3DXCOLOR diffuse;
D3DXCOLOR specular;
D3DXVECTOR3 directionInWorld;
};
struct Material
{
Material()
:ambient(WHITE), diffuse(WHITE), specular(WHITE), specularPower(8.0f){}
Material(const D3DXCOLOR& a, const D3DXCOLOR& d,
const D3DXCOLOR& s, float power)
:ambient(a), diffuse(d), specular(s), specularPower(power){}
D3DXCOLOR ambient;
D3DXCOLOR diffuse;
D3DXCOLOR specular;
float specularPower;
};
DirectionalLight g_structDirectionalLight;
Material g_structMaterial;
D3DXVECTOR2 g_scaleHeights = D3DXVECTOR2(0.7f, 1.1f);
float g_fTexScale = 8.0f;
D3DXVECTOR2 g_normalMapVelocity1 = D3DXVECTOR2(0.05f, 0.07f);
D3DXVECTOR2 g_normalMapVelocity2 = D3DXVECTOR2(-0.01f, 0.13f);
D3DXVECTOR2 g_displacementMapVelocity1 = D3DXVECTOR2(0.012f, 0.015f);
D3DXVECTOR2 g_displacementMapVelocity2 = D3DXVECTOR2(0.014f, 0.05f);
// Offset of normal maps for scrolling (vary as a function of time)
D3DXVECTOR2 g_normalMapOffset1(0.0f, 0.0f);
D3DXVECTOR2 g_normalMapOffset2(0.0f, 0.0f);
// Offset of displacement maps for scrolling (vary as a function of time)
D3DXVECTOR2 g_displacementMapOffset1(0.0f, 0.0f);
D3DXVECTOR2 g_displacementMapOffset2(0.0f, 0.0f);
#endif
#if phase4
#include "SDKmisc.h"//加载文件时会用到
ID3DXEffect* g_pEffect = NULL; // D3DX effect interface
D3DXHANDLE g_hTech = 0;
D3DXHANDLE g_hWorld = 0;
D3DXHANDLE g_hWorldInv = 0;
D3DXHANDLE g_hWorldViewProj = 0;
D3DXHANDLE g_hEyePositionInWorld = 0;
D3DXHANDLE g_hDirectionalLightStruct = 0;
D3DXHANDLE g_hMaterialStruct = 0;
D3DXHANDLE g_hNormalTex1 = 0;
D3DXHANDLE g_hNormalTex2 = 0;
D3DXHANDLE g_hDisplacementTex1 = 0;
D3DXHANDLE g_hDisplacementTex2 = 0;
D3DXHANDLE g_hNormalOffset1 = 0;
D3DXHANDLE g_hNormalOffset2 = 0;
D3DXHANDLE g_hDisplacementOffset1 = 0;
D3DXHANDLE g_hDisplacementOffset2 = 0;
D3DXHANDLE g_hScaleHeights = 0; //缩放移位1,2纹理得到的高度
D3DXHANDLE g_hDelta = 0; //网格X,Z轴方向的步长
#endif
//--------------------------------------------------
// Rejects any D3D9 devices that aren't acceptable to the app by returning false
//--------------------------------------------------
bool CALLBACK IsD3D9DeviceAcceptable( D3DCAPS9* pCaps, D3DFORMAT AdapterFormat, D3DFORMAT BackBufferFormat,
bool bWindowed, void* pUserContext )
{
// Typically want to skip back buffer formats that don't support alpha blending
IDirect3D9* pD3D = DXUTGetD3D9Object();
if( FAILED( pD3D->CheckDeviceFormat( pCaps->AdapterOrdinal, pCaps->DeviceType,
AdapterFormat, D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING,
D3DRTYPE_TEXTURE, BackBufferFormat ) ) )
return false;
return true;
}
//--------------------------------------------------
// Before a device is created, modify the device settings as needed
//--------------------------------------------------
bool CALLBACK ModifyDeviceSettings( DXUTDeviceSettings* pDeviceSettings, void* pUserContext )
{
#if phase1
pDeviceSettings->d3d9.pp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
#endif
return true;
}
#if phase3
//create Vertex Declaration
HRESULT createVertexDeclaration( IDirect3DDevice9* pd3dDevice )
{
D3DVERTEXELEMENT9 decl[] =
{
// offsets in bytes
{0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0},
{0, 12, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0},
{0, 20, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 1},
D3DDECL_END()
};
return pd3dDevice->CreateVertexDeclaration(decl, &g_pVertexDecl);
}
struct GridVertexFormat
{
D3DXVECTOR3 pos;
D3DXVECTOR2 scaledTexCoord; // [a, b]
D3DXVECTOR2 normalizedTexCoord; // [0, 1]
};
//将顶点位置以及索引写入指定的vector中,为后面写入缓冲区打下基础
void writeVertexPosAndIndicesToVectors(int iVerticesNumPerRow, int iVerticesNumPerCol,float fDeltaX, float fDeltaZ,
const D3DXVECTOR3& center,std::vector<D3DXVECTOR3>& vecVertexPosData,
std::vector<DWORD>& vecIndexData)
{
int iVerticesNum = (iVerticesNumPerRow) * (iVerticesNumPerCol);
int iCellsNumPerRow = iVerticesNumPerRow - 1;
int iCellsNumPerCol = iVerticesNumPerCol - 1;
int iTrianglesNum = iCellsNumPerRow * iCellsNumPerCol * 2;
float fWidth = (float)iCellsNumPerCol * fDeltaX;
float fDepth = (float)iCellsNumPerRow * fDeltaZ;
//===========================================
// Build vertices.
// We first build the grid geometry centered about the origin and on
// the xz-plane, row-by-row and in a top-down fashion. We then translate
// the grid vertices so that they are centered about the specified
// parameter 'center'.从左上角开始,列序优先的方式放置顶点数据
vecVertexPosData.resize( iVerticesNum );
// Offsets to translate grid from quadrant 4 to center of
// coordinate system.
float fOffsetX = -fWidth * 0.5f;
float fOffsetZ = fDepth * 0.5f;
int k = 0;
for(int i = 0; i < iVerticesNumPerRow; ++i)
{
for(int j = 0; j < iVerticesNumPerCol; ++j)
{
// Negate the depth coordinate to put in quadrant four.
// Then offset to center about coordinate system.
vecVertexPosData[k].x = j * fDeltaX + fOffsetX;
vecVertexPosData[k].z = -i * fDeltaZ + fOffsetZ;
vecVertexPosData[k].y = 0.0f;
// Translate so that the center of the grid is at the
// specified 'center' parameter.
D3DXMATRIX T;
D3DXMatrixTranslation(&T, center.x, center.y, center.z);
D3DXVec3TransformCoord(&vecVertexPosData[k], &vecVertexPosData[k], &T);
++k; // Next vertex
}
}
//===========================================
// Build indices.
vecIndexData.resize(iTrianglesNum * 3);
// Generate indices for each quad.
k = 0;
for(DWORD i = 0; i < (DWORD)iCellsNumPerRow; ++i)
{
for(DWORD j = 0; j < (DWORD)iCellsNumPerCol; ++j)
{
vecIndexData[k] = i * iVerticesNumPerCol + j;
vecIndexData[k + 1] = i * iVerticesNumPerCol + j + 1;
vecIndexData[k + 2] = (i+1) * iVerticesNumPerCol + j;
vecIndexData[k + 3] = (i+1) * iVerticesNumPerCol + j;
vecIndexData[k + 4] = i * iVerticesNumPerCol + j + 1;
vecIndexData[k + 5] = (i+1) * iVerticesNumPerCol + j + 1;
// 1---2 5
// | / / |
// | / / |
// 3 4---6
// next quad
k += 6;
}
}
}
#endif
//--------------------------------------------------
// Create any D3D9 resources that will live through a device reset (D3DPOOL_MANAGED)
// and aren't tied to the back buffer size
//--------------------------------------------------
HRESULT CALLBACK OnD3D9CreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
void* pUserContext )
{
#if phase3
HRESULT hr;
#endif
#if phase1
// Setup the camera's view parameters
D3DXVECTOR3 vecEye( 0.0f, 0.0f, -5.0f );
D3DXVECTOR3 vecAt ( 0.0f, 0.0f, -0.0f );
g_Camera.SetViewParams( &vecEye, &vecAt );
FLOAT fObjectRadius=1;
//摄像机缩放的3个参数
//g_Camera.SetRadius( fObjectRadius * 3.0f, fObjectRadius * 0.5f, fObjectRadius * 10.0f );
g_Camera.SetEnablePositionMovement( true );
#endif
#if phase2
D3DXCreateCubeTextureFromFile(pd3dDevice, L"grassenvmap1024.dds", &g_pCubeTex);
#endif
#if phase3
createVertexDeclaration(pd3dDevice);
DWORD dwTrianglesNum = (g_iVerticesNumPerRow - 1) * (g_iVerticesNumPerCol - 1) * 2;
DWORD dwVerticesNum = g_iVerticesNumPerRow * g_iVerticesNumPerCol;
D3DVERTEXELEMENT9 elems[MAX_FVF_DECL_SIZE];
UINT uElemsNum = 0;
g_pVertexDecl->GetDeclaration(elems, &uElemsNum);
V( D3DXCreateMesh(dwTrianglesNum, dwVerticesNum, D3DXMESH_MANAGED, elems, pd3dDevice, &g_pMesh) );
//===============================================================
// Write the grid vertices and triangles to the mesh.
GridVertexFormat *pVertices = NULL;
V( g_pMesh->LockVertexBuffer(0, (void**)&pVertices) );
std::vector<D3DXVECTOR3> vecVertexPosData;
std::vector<DWORD> vecIndexData;
writeVertexPosAndIndicesToVectors(g_iVerticesNumPerRow, g_iVerticesNumPerCol, g_fDeltaX,
g_fDeltaZ, D3DXVECTOR3(0.0f, 0.0f, 0.0f), vecVertexPosData, vecIndexData);
for(int i = 0; i < g_iVerticesNumPerRow; ++i)
{
for(int j = 0; j < g_iVerticesNumPerCol; ++j)
{
DWORD index = i * g_iVerticesNumPerCol + j;
pVertices[index].pos = vecVertexPosData[index];
//注意每步步长为1/127,最后一个点的U纹理坐标为1,第一个点的U纹理坐标为0,实现了无缝结合
//有人会问为什么129个点就不行呢?因为纹理只有128个点的位置,129个点的话,必然会有一个纹理
//坐标重合,这样就破坏了纹理的连续性,就相当于把纹理从中拉开了一个距离出来一样,并且这个
//距离平行U方向的颜色都一样.所以一旦位移纹理偏移就不会连续了
pVertices[index].scaledTexCoord = D3DXVECTOR2((float)j / (g_iVerticesNumPerCol-1),
(float)i / (g_iVerticesNumPerRow-1))* g_fTexScale;
//g_fTexScale表示Grid里面用几个纹理,值越大表示纹理重复次数越多
pVertices[index].normalizedTexCoord = D3DXVECTOR2((float)j / (g_iVerticesNumPerCol-1) ,
(float)i / (g_iVerticesNumPerRow-1));//注意这里应该减1,好实现首尾衔接,当然纹理的V
//坐标不用衔接,如果不减1,那么纹理将不会衔接就相当于只用了纹理的前127个像素,虽然没有影响
//纹理的连续性,但是会影响衔接性
}
}
V( g_pMesh->UnlockVertexBuffer() );
//===============================================================
// Write triangle data(Indices & Attributes) so we can compute normals.
WORD* pIndices = NULL;
V( g_pMesh->LockIndexBuffer(0, (void**)&pIndices) );
DWORD* pAttributes = NULL;
V( g_pMesh->LockAttributeBuffer(0, &pAttributes) );
for(UINT i = 0; i < g_pMesh->GetNumFaces(); ++i)
{
pIndices[i*3+0] = (WORD)vecIndexData[i*3+0];
pIndices[i*3+1] = (WORD)vecIndexData[i*3+1];
pIndices[i*3+2] = (WORD)vecIndexData[i*3+2];
pAttributes[i] = 0; // All in subset 0.
}
V( g_pMesh->UnlockIndexBuffer() );
V( g_pMesh->UnlockAttributeBuffer() );
//===============================================================
// Optimize for the vertex cache and build attribute table.
// D3DXMESHOPT_ATTRSORT optimization builds an attribute table.
DWORD* adj = new DWORD[g_pMesh->GetNumFaces() * 3];
// Generate adjacency info
V(g_pMesh->GenerateAdjacency(EPSILON, adj));
V(g_pMesh->OptimizeInplace(D3DXMESHOPT_VERTEXCACHE|D3DXMESHOPT_ATTRSORT,adj, 0, 0, 0));
delete[] adj;
//===============================================================
// Create textures.
V(D3DXCreateTextureFromFile(pd3dDevice, L"normal_map1.dds", &g_pNormalTex1));
V(D3DXCreateTextureFromFile(pd3dDevice, L"normal_map2.dds", &g_pNormalTex2));
V(D3DXCreateTextureFromFileEx(pd3dDevice, L"displacement_map1.dds", g_iVerticesNumPerRow,
g_iVerticesNumPerCol,1, 0, D3DFMT_R32F, D3DPOOL_MANAGED, D3DX_DEFAULT, D3DX_DEFAULT,
0, 0, 0, &g_pDisplacementTex1));
V(D3DXCreateTextureFromFileEx(pd3dDevice, L"displacement_map2.dds", g_iVerticesNumPerRow,
g_iVerticesNumPerCol,1, 0, D3DFMT_R32F, D3DPOOL_MANAGED, D3DX_DEFAULT, D3DX_DEFAULT,
0, 0, 0, &g_pDisplacementTex2));
#endif
#if phase4
WCHAR str[MAX_PATH];
// Read the D3DX effect file
V_RETURN( DXUTFindDXSDKMediaFileCch( str, MAX_PATH, L"DisplacementMapping.fx" ) );
// Create the effect
LPD3DXBUFFER pErrorBuff = NULL;
V_RETURN( D3DXCreateEffectFromFile(
pd3dDevice, // associated device
str, // effect filename
NULL, // no preprocessor definitions
NULL, // no ID3DXInclude interface
D3DXSHADER_DEBUG, // compile flags
NULL, // don't share parameters
&g_pEffect, // return effect
&pErrorBuff // return error messages
) );
if( pErrorBuff )
MessageBoxA(0, (char*)pErrorBuff->GetBufferPointer(), 0, 0);
// get handle
g_hTech = g_pEffect->GetTechniqueByName("myTech");
g_hWorld = g_pEffect->GetParameterByName(0, "g_mWorld");
g_hWorldInv = g_pEffect->GetParameterByName(0, "g_mWorldInv");
g_hWorldViewProj = g_pEffect->GetParameterByName(0, "g_mWorldViewProj");
g_hEyePositionInWorld = g_pEffect->GetParameterByName(0, "g_eyePositionInWorld");
g_hDirectionalLightStruct = g_pEffect->GetParameterByName(0, "g_structDirectionalLight");
g_hMaterialStruct = g_pEffect->GetParameterByName(0, "g_structMaterial");
g_hNormalTex1 = g_pEffect->GetParameterByName(0, "g_texNormalMap1");
g_hNormalTex2 = g_pEffect->GetParameterByName(0, "g_texNormalMap2");
g_hDisplacementTex1 = g_pEffect->GetParameterByName(0, "g_texDisplacementMap1");
g_hDisplacementTex2 = g_pEffect->GetParameterByName(0, "g_texDisplacementMap2");
g_hNormalOffset1 = g_pEffect->GetParameterByName(0, "g_normalOffset1");
g_hNormalOffset2 = g_pEffect->GetParameterByName(0, "g_normalOffset2");
g_hDisplacementOffset1 = g_pEffect->GetParameterByName(0, "g_DisplacementOffset1");
g_hDisplacementOffset2 = g_pEffect->GetParameterByName(0, "g_DisplacementOffset2");
g_hScaleHeights = g_pEffect->GetParameterByName(0, "g_scaleHeights");
g_hDelta = g_pEffect->GetParameterByName(0, "g_delta");
// We don't need to set these every frame since they do not change.
V(g_pEffect->SetTechnique(g_hTech));
V(g_pEffect->SetTexture(g_hNormalTex1, g_pNormalTex1));
V(g_pEffect->SetTexture(g_hNormalTex2, g_pNormalTex2));
V(g_pEffect->SetTexture(g_hDisplacementTex1, g_pDisplacementTex1));
V(g_pEffect->SetTexture(g_hDisplacementTex2, g_pDisplacementTex2));
g_structDirectionalLight.directionInWorld = D3DXVECTOR3(0.0f, -1.0f, -3.0f);
D3DXVec3Normalize(&g_structDirectionalLight.directionInWorld, &g_structDirectionalLight.directionInWorld);
g_structDirectionalLight.ambient = D3DXCOLOR(0.3f, 0.3f, 0.3f, 1.0f);
g_structDirectionalLight.diffuse = D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f);
g_structDirectionalLight.specular = D3DXCOLOR(0.7f, 0.7f, 0.7f, 1.0f);
V(g_pEffect->SetValue(g_hDirectionalLightStruct, &g_structDirectionalLight, sizeof(DirectionalLight)));
g_structMaterial.ambient = D3DXCOLOR(0.4f, 0.4f, 0.7f, 0.0f);
g_structMaterial.diffuse = D3DXCOLOR(0.4f, 0.4f, 0.7f, 1.0f);
g_structMaterial.specular = 0.8f*WHITE;
g_structMaterial.specularPower = 128.0f;
V(g_pEffect->SetValue(g_hMaterialStruct, &g_structMaterial, sizeof(Material)));
V(g_pEffect->SetValue(g_hScaleHeights, &g_scaleHeights, sizeof(D3DXVECTOR2)));
D3DXVECTOR2 delta(g_fDeltaX, g_fDeltaZ);
V(g_pEffect->SetValue(g_hDelta, &delta, sizeof(D3DXVECTOR2)));
#endif
return S_OK;
}
#if phase2
struct MyVertexFormat
{
FLOAT x, y, z;
FLOAT u, v, w;
};
#define FVF_VERTEX (D3DFVF_XYZ | D3DFVF_TEX1 | D3DFVF_TEXCOORDSIZE3(0) )
static HRESULT initVertexIndexBuffer(IDirect3DDevice9* pd3dDevice)
{
static const MyVertexFormat Vertices[] =
{
//+X
{ 1, -1, -1, 1, -1, -1 },
{ 1, -1, 1, 1, -1, 1 },
{ 1, 1, 1 , 1, 1, 1 },
{ 1, 1, -1, 1, 1, -1 },
//-X
{ -1, -1, -1,-1, -1, -1 },
{ -1, 1, -1, -1, 1, -1 },
{ -1, 1, 1 , -1, 1, 1 },
{ -1, -1, 1, -1, -1, 1},
//+Y
{ -1, 1, -1 ,-1, 1, -1 },
{ 1, 1, -1 ,1, 1, -1 },
{ 1, 1, 1 ,1, 1, 1},
{ -1, 1, 1 ,-1, 1, 1 },
//-Y
{ -1, -1, -1,-1, -1, -1 },
{ -1, -1, 1,-1, -1, 1 },
{ 1, -1, 1,1, -1, 1 },
{ 1, -1, -1, 1, -1, -1},
//Z
{ -1, -1, 1,-1, -1, 1 },
{ -1, 1, 1,-1, 1, 1 },
{ 1, 1, 1,1, 1, 1 },
{ 1, -1, 1,1, -1, 1 },
//-Z
{ -1, -1, -1,-1, -1, -1 },
{ 1, -1, -1,1, -1, -1 },
{ 1, 1, -1,1, 1, -1 },
{ -1, 1, -1,-1, 1, -1 }
};
if (FAILED(pd3dDevice->CreateVertexBuffer(sizeof(Vertices),
0, FVF_VERTEX,
D3DPOOL_DEFAULT,
&g_pVB, NULL))) {
return E_FAIL;
}
void* pVertices;
if (FAILED(g_pVB->Lock(0, 0, /* map entire buffer */
&pVertices, 0))) {
return E_FAIL;
}
memcpy(pVertices, Vertices, sizeof(Vertices));
g_pVB->Unlock();
// Create and initialize index buffer
static const WORD Indices[] =
{
0, 1, 2,
0, 2, 3,
4, 5, 6,
4, 6, 7,
8, 9, 10,
8,10, 11,
12,13,14,
12,14,15,
16,17,18,
16,18,19,
20,21,22,
20,22,23
};
if (FAILED(pd3dDevice->CreateIndexBuffer(sizeof(Indices),
D3DUSAGE_WRITEONLY,
D3DFMT_INDEX16,
D3DPOOL_DEFAULT,
&g_pIB, NULL))) {
return E_FAIL;
}
void* pIndices;
if (FAILED(g_pIB->Lock(0, 0, /* map entire buffer */
&pIndices, 0))) {
return E_FAIL;
}
memcpy(pIndices, Indices, sizeof(Indices));
g_pIB->Unlock();
return S_OK;
}
#endif
//--------------------------------------------------
// Create any D3D9 resources that won't live through a device reset (D3DPOOL_DEFAULT)
// or that are tied to the back buffer size
//--------------------------------------------------
HRESULT CALLBACK OnD3D9ResetDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
void* pUserContext )
{
#if phase1
pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );
//关闭光照处理, 默认情况下启用光照处理
pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );
//Setup the camera's projection parameters
float fAspectRatio = pBackBufferSurfaceDesc->Width / ( FLOAT )pBackBufferSurfaceDesc->Height;
g_Camera.SetProjParams( D3DX_PI / 2, fAspectRatio, 0.1f, 5000.0f );
#endif
#if phase4
#if phase3
HRESULT hr;
if( g_pEffect )
V_RETURN( g_pEffect->OnResetDevice() );
#endif
#endif
#if !phase2
return S_OK;
#else
return initVertexIndexBuffer(pd3dDevice);
#endif
}
//--------------------------------------------------
// Handle updates to the scene. This is called regardless of which D3D API is used
//--------------------------------------------------
void CALLBACK OnFrameMove( double fTime, float fElapsedTime, void* pUserContext )
{
#if phase1
g_Camera.FrameMove( fElapsedTime );
#endif
#if phase4
g_normalMapOffset1 += g_normalMapVelocity1 * fElapsedTime;
g_normalMapOffset2 += g_normalMapVelocity2 * fElapsedTime;
g_displacementMapOffset1 += g_displacementMapVelocity1 * fElapsedTime;
//g_displacementMapOffset2 += g_displacementMapVelocity2 * fElapsedTime;
if(g_normalMapOffset1.x >= 1.0f || g_normalMapOffset1.x <= -1.0f)
g_normalMapOffset1.x = 0.0f;
if(g_normalMapOffset2.x >= 1.0f || g_normalMapOffset2.x <= -1.0f)
g_normalMapOffset2.x = 0.0f;
if(g_normalMapOffset1.y >= 1.0f || g_normalMapOffset1.y <= -1.0f)
g_normalMapOffset1.y = 0.0f;
if(g_normalMapOffset2.y >= 1.0f || g_normalMapOffset2.y <= -1.0f)
g_normalMapOffset2.y = 0.0f;
if(g_displacementMapOffset1.x >= 1.0f || g_displacementMapOffset1.x <= -1.0f)
g_displacementMapOffset1.x = 0.0f;
if(g_displacementMapOffset2.x >= 1.0f || g_displacementMapOffset2.x <= -1.0f)
g_displacementMapOffset2.x = 0.0f;
if(g_displacementMapOffset1.y >= 1.0f || g_displacementMapOffset1.y <= -1.0f)
g_displacementMapOffset1.y = 0.0f;
if(g_displacementMapOffset2.y >= 1.0f || g_displacementMapOffset2.y <= -1.0f)
g_displacementMapOffset2.y = 0.0f;
#endif
}
//--------------------------------------------------
// Render the scene using the D3D9 device
//--------------------------------------------------
void CALLBACK OnD3D9FrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
HRESULT hr;
// Clear the render target and the zbuffer
V( pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB( 0, 45, 50, 170 ), 1.0f, 0 ) );
// Render the scene
if( SUCCEEDED( pd3dDevice->BeginScene() ) )
{
#if phase2
pd3dDevice->SetRenderState(D3DRS_LIGHTING, false);
// Set world matrix
D3DXMATRIX M;
D3DXMatrixIdentity( &M ); // M = identity matrix
D3DXMatrixScaling(&M,2000, 2000, 2000);
pd3dDevice->SetTransform(D3DTS_WORLD, &M) ;
// Set view matrix
D3DXMATRIX view = *g_Camera.GetViewMatrix() ;
pd3dDevice->SetTransform(D3DTS_VIEW, &view) ;
// Set projection matrix
D3DXMATRIX proj = *g_Camera.GetProjMatrix() ;
pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CCW);
pd3dDevice->SetTransform(D3DTS_PROJECTION, &proj) ;
pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(MyVertexFormat));
pd3dDevice->SetIndices(g_pIB);//sets the current index buffer.
pd3dDevice->SetFVF(FVF_VERTEX);//Sets the current vertex stream declaration.
pd3dDevice->SetTexture(0, g_pCubeTex);
pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 24, 0, 12);
#endif
#if phase3
D3DXMatrixIdentity( &M ); // M = identity matrix
pd3dDevice->SetTransform(D3DTS_WORLD, &M) ;
pd3dDevice->SetTexture(0, 0);
g_pMesh->DrawSubset(0);
#endif
#if phase4
pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
D3DXMATRIXA16 mWorld, mWorldInv;
D3DXMatrixIdentity(&mWorld);
V(g_pEffect->SetMatrix(g_hWorld, &mWorld));
D3DXMatrixInverse(&mWorldInv, 0, &mWorld);
V(g_pEffect->SetMatrix(g_hWorldInv, &mWorldInv));
//set WorldViewProject matrix
D3DXMATRIXA16 mWorldViewProjection;
mWorldViewProjection = *g_Camera.GetViewMatrix() * *g_Camera.GetProjMatrix();
V( g_pEffect->SetMatrix( g_hWorldViewProj, &mWorldViewProjection) );
V( g_pEffect->SetFloatArray( g_hEyePositionInWorld, (const float*)(g_Camera.GetEyePt()), 3) );
V(g_pEffect->SetValue(g_hNormalOffset1, &g_normalMapOffset1, sizeof(D3DXVECTOR2)));
V(g_pEffect->SetValue(g_hNormalOffset2, &g_normalMapOffset2, sizeof(D3DXVECTOR2)));
V(g_pEffect->SetValue(g_hDisplacementOffset1, &g_displacementMapOffset1, sizeof(D3DXVECTOR2)));
V(g_pEffect->SetValue(g_hDisplacementOffset2, &g_displacementMapOffset2, sizeof(D3DXVECTOR2)));
UINT iPass, cPasses;
V( g_pEffect->Begin( &cPasses, 0 ) );
for( iPass = 0; iPass < cPasses ; iPass++ )
{
V( g_pEffect->BeginPass( iPass ) );
g_pMesh->DrawSubset(0);
V( g_pEffect->EndPass() );
}
V( g_pEffect->End() );
#endif
V( pd3dDevice->EndScene() );
}
}
//--------------------------------------------------
// Handle messages to the application
//--------------------------------------------------
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam,
bool* pbNoFurtherProcessing, void* pUserContext )
{
#if phase1
g_Camera.HandleMessages( hWnd, uMsg, wParam, lParam );
#endif
return 0;
}
//--------------------------------------------------
// Release D3D9 resources created in the OnD3D9ResetDevice callback
//--------------------------------------------------
void CALLBACK OnD3D9LostDevice( void* pUserContext )
{
#if phase2
SAFE_RELEASE(g_pVB);
SAFE_RELEASE(g_pIB);
#endif
#if phase3
SAFE_RELEASE(g_pVertexDecl);
#endif
#if phase4
if( g_pEffect )
g_pEffect->OnLostDevice();
#endif
}
//--------------------------------------------------
// Release D3D9 resources created in the OnD3D9CreateDevice callback
//--------------------------------------------------
void CALLBACK OnD3D9DestroyDevice( void* pUserContext )
{
#if phase2
SAFE_RELEASE(g_pCubeTex);
#endif
#if phase3
SAFE_RELEASE(g_pMesh);
SAFE_RELEASE(g_pNormalTex1);
SAFE_RELEASE(g_pNormalTex2);
SAFE_RELEASE(g_pDisplacementTex1);
SAFE_RELEASE(g_pDisplacementTex2);
#endif
#if phase4
SAFE_RELEASE(g_pEffect);
#endif
}
//--------------------------------------------------
// Initialize everything and go into a render loop
//--------------------------------------------------
INT WINAPI wWinMain( HINSTANCE, HINSTANCE, LPWSTR, int )
{
// Enable run-time memory check for debug builds.
#if defined(DEBUG) | defined(_DEBUG)
_CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
#endif
// Set the callback functions
DXUTSetCallbackD3D9DeviceAcceptable( IsD3D9DeviceAcceptable );
DXUTSetCallbackD3D9DeviceCreated( OnD3D9CreateDevice );
DXUTSetCallbackD3D9DeviceReset( OnD3D9ResetDevice );
DXUTSetCallbackD3D9FrameRender( OnD3D9FrameRender );
DXUTSetCallbackD3D9DeviceLost( OnD3D9LostDevice );
DXUTSetCallbackD3D9DeviceDestroyed( OnD3D9DestroyDevice );
DXUTSetCallbackDeviceChanging( ModifyDeviceSettings );
DXUTSetCallbackMsgProc( MsgProc );
DXUTSetCallbackFrameMove( OnFrameMove );
// TODO: Perform any application-level initialization here
// Initialize DXUT and create the desired Win32 window and Direct3D device for the application
DXUTInit( true, true ); // Parse the command line and show msgboxes
DXUTSetHotkeyHandling( true, true, true ); // handle the default hotkeys
DXUTSetCursorSettings( true, true ); // Show the cursor and clip it when in full screen
DXUTCreateWindow( L"3D_Shader_DisplacementMapping" );
DXUTCreateDevice( true, 1024, 768 );
// Start the render loop
DXUTMainLoop();
// TODO: Perform any application-level cleanup here
return DXUTGetExitCode();
}
/*------------------------
3D_Shader_DisplacementMapping.cpp -- achieve displacement mapping
(c) Seamanj.2013/9/2
------------------------*/
struct Material
{
float4 ambient;
float4 diffuse;
float4 specular;
float specularPower;
};
struct DirectionalLight
{
float4 ambient;
float4 diffuse;
float4 specular;
float3 directionInWorld;
};
uniform extern float4x4 g_mWorld;
uniform extern float4x4 g_mWorldInv;
uniform extern float4x4 g_mWorldViewProj;
uniform extern float3 g_eyePositionInWorld;
uniform extern DirectionalLight g_structDirectionalLight;
uniform extern Material g_structMaterial;
// Two normal maps and displacement maps.
uniform extern texture g_texNormalMap1;
uniform extern texture g_texNormalMap2;
uniform extern texture g_texDisplacementMap1;
uniform extern texture g_texDisplacementMap2;
// Texture coordinate offset vectors for scrolling
// normal maps and displacement maps.
uniform extern float2 g_normalOffset1;
uniform extern float2 g_normalOffset2;
uniform extern float2 g_DisplacementOffset1;
uniform extern float2 g_DisplacementOffset2;
// User-defined scaling factors to scale the heights
// sampled from the displacement map into a more convenient
// range.
uniform extern float2 g_scaleHeights;
// Space between grids in x,z directions in local space
// used for finite differencing.
uniform extern float2 g_delta;
// Shouldn't be hardcoded, but ok for demo.
static const float DISPLACEMENTMAP_SIZE = 128.0f;
static const float DISPLACEMENTMAP_DELTA = 1.0f / DISPLACEMENTMAP_SIZE;
sampler g_samNormalMap1 = sampler_state
{
Texture = <g_texNormalMap1>;
MinFilter = ANISOTROPIC;
MaxAnisotropy = 12;
MagFilter = LINEAR;
MipFilter = LINEAR;
AddressU = WRAP;
AddressV = WRAP;
};
sampler g_samNormalMap2 = sampler_state
{
Texture = <g_texNormalMap2>;
MinFilter = ANISOTROPIC;
MaxAnisotropy = 12;
MagFilter = LINEAR;
MipFilter = LINEAR;
AddressU = WRAP;
AddressV = WRAP;
};
sampler g_samDisplacementMap1 = sampler_state
{
Texture = <g_texDisplacementMap1>;
MinFilter = POINT;
MagFilter = POINT;
MipFilter = POINT;
AddressU = WRAP;
AddressV = WRAP;
};
sampler g_samDisplacementMap2 = sampler_state
{
Texture = <g_texDisplacementMap2>;
MinFilter = POINT;
MagFilter = POINT;
MipFilter = POINT;
AddressU = WRAP;
AddressV = WRAP;
};
struct OutputVS
{
float4 posInHomogeneous : POSITION0;
float3 toEyeInTangent : TEXCOORD0;
float3 lightDirectionInTangent : TEXCOORD1;
float2 texcoord1 : TEXCOORD2;
float2 texcoord2 : TEXCOORD3;
};
float3 CartesianToSpherical(float3 cartesianCoord,float radius)
{
float gamma,theta;
gamma = cartesianCoord.x / (g_delta.x * 127 / 2) * 3.14159265;
theta = (g_delta.y * 127 / 2 - cartesianCoord.z) / (g_delta.y * 127 / 2) * 3.14159265 / 2;
float sinGamma,cosGamma,sinTheta,cosTheta;
sincos(gamma, sinGamma, cosGamma);
sincos(theta, sinTheta, cosTheta);
float3 sphericalCoord;
radius = radius + cartesianCoord.y ;
sphericalCoord.x = radius * sinTheta * cosGamma;
sphericalCoord.z = radius * sinTheta * sinGamma;
sphericalCoord.y = radius * cosTheta;
return sphericalCoord;
}
float DoDisplacementMapping(float2 texCoord1, float2 texCoord2)
{
// Transform to texel space
float2 texelPos = DISPLACEMENTMAP_SIZE * texCoord1;
// Determine the lerp amounts.
float2 lerps = frac(texelPos);
float height1[4];
//由于移位纹理显示青色(即B,G通道都为1,所以应该是R通道存储的是高度
height1[0] = tex2Dlod(g_samDisplacementMap1, float4(texCoord1, 0.0f, 0.0f)).r;
height1[1] = tex2Dlod(g_samDisplacementMap1, float4(texCoord1, 0.0f, 0.0f)+float4(DISPLACEMENTMAP_DELTA, 0.0f, 0.0f, 0.0f)).r;
height1[2] = tex2Dlod(g_samDisplacementMap1, float4(texCoord1, 0.0f, 0.0f)+float4(0.0f, DISPLACEMENTMAP_DELTA, 0.0f, 0.0f)).r;
height1[3] = tex2Dlod(g_samDisplacementMap1, float4(texCoord1, 0.0f, 0.0f)+float4(DISPLACEMENTMAP_DELTA, DISPLACEMENTMAP_DELTA, 0.0f, 0.0f)).r;
//这里取出来的值范围在[0,1]之内
// Filter displacement map:
float h1 = lerp( lerp( height1[0], height1[1], lerps.x ),
lerp( height1[2], height1[3], lerps.x ),
lerps.y );
texelPos = DISPLACEMENTMAP_SIZE * texCoord2;
lerps = frac(texelPos);
float height2[4];
height2[0] = tex2Dlod(g_samDisplacementMap2, float4(texCoord2, 0.0f, 0.0f)).r;
height2[1] = tex2Dlod(g_samDisplacementMap2, float4(texCoord2, 0.0f, 0.0f)+float4(DISPLACEMENTMAP_DELTA, 0.0f, 0.0f, 0.0f)).r;
height2[2] = tex2Dlod(g_samDisplacementMap2, float4(texCoord2, 0.0f, 0.0f)+float4(0.0f, DISPLACEMENTMAP_DELTA, 0.0f, 0.0f)).r;
height2[3] = tex2Dlod(g_samDisplacementMap2, float4(texCoord2, 0.0f, 0.0f)+float4(DISPLACEMENTMAP_DELTA, DISPLACEMENTMAP_DELTA, 0.0f, 0.0f)).r;
// Filter displacement map:
float h2 = lerp( lerp( height2[0], height2[1], lerps.x ),
lerp( height2[2], height2[3], lerps.x ),
lerps.y );
// Sum and scale the sampled heights.
return g_scaleHeights.x * h1 + g_scaleHeights.y * h2;
}
OutputVS myVertexEntry(float3 positionInLocal : POSITION0,
float2 scaledTexCoord : TEXCOORD0,//供法线纹理使用
float2 normalizedTexCoord : TEXCOORD1)//供移位纹理使用
{
// Zero out our output.
OutputVS outVS = (OutputVS)0;
// Scroll vertex texture coordinates to animate waves.
float2 DisplacementTexCoord1 = normalizedTexCoord + g_DisplacementOffset1;
float2 DisplacementTexCoord2 = normalizedTexCoord + g_DisplacementOffset2;
// Set y-coordinate of water grid vertices based on displacement mapping.
positionInLocal.y = DoDisplacementMapping(DisplacementTexCoord1, DisplacementTexCoord2);
// Estimate TBN-basis using finite differencing in local space.
float left = DoDisplacementMapping(DisplacementTexCoord1 + float2(DISPLACEMENTMAP_DELTA, 0.0f),
DisplacementTexCoord2 + float2(0.0f, DISPLACEMENTMAP_DELTA));
float front = DoDisplacementMapping(DisplacementTexCoord1 + float2(DISPLACEMENTMAP_DELTA, 0.0f),
DisplacementTexCoord2 + float2(0.0f, DISPLACEMENTMAP_DELTA));
float3x3 TBN;
TBN[0] = normalize(float3(1.0f, (left - positionInLocal.y)/g_delta.x, 0.0f)); //Tangent
TBN[1] = normalize(float3(0.0f, (front - positionInLocal.y)/g_delta.y, -1.0f));//Binormal
TBN[2] = normalize(cross(TBN[0], TBN[1]));//Normal
// Matrix transforms from object space to tangent space.
float3x3 toTangentSpace = transpose(TBN);
// Transform eye position to local space.
float3 eyePositionInLocal = mul(float4(g_eyePositionInWorld, 1.0f), g_mWorldInv).xyz;
// Transform to-eye vector to tangent space.
float3 toEyeInLocal = eyePositionInLocal - positionInLocal;
outVS.toEyeInTangent = mul(toEyeInLocal, toTangentSpace);
// Transform light direction to tangent space.
float3 lightDirectionInLocal = mul(float4(g_structDirectionalLight.directionInWorld, 0.0f), g_mWorldInv).xyz;
outVS.lightDirectionInTangent = mul(lightDirectionInLocal, toTangentSpace);
positionInLocal = CartesianToSpherical(positionInLocal, 30.0f);
// Transform to homogeneous clip space.
outVS.posInHomogeneous = mul(float4(positionInLocal, 1.0f), g_mWorldViewProj);
// Scroll texture coordinates.
outVS.texcoord1 = scaledTexCoord+ g_normalOffset1;
outVS.texcoord2 = scaledTexCoord+ g_normalOffset2;
// Done--return the output.
return outVS;
}
float4 myPixelEntry(float3 toEyeInTangent : TEXCOORD0,
float3 lightDirectionInTangent : TEXCOORD1,
float2 texcoord1 : TEXCOORD2,
float2 texcoord2 : TEXCOORD3) : COLOR
{
// Interpolated normals can become unnormal--so normalize.
// Note that toEyeW and normalW do not need to be normalized
// because they are just used for a reflection and environment
// map look-up and only direction matters.
toEyeInTangent = normalize(toEyeInTangent);
lightDirectionInTangent = normalize(lightDirectionInTangent);
// Light vector is opposite the direction of the light.
float3 toLightInTangent = -lightDirectionInTangent;
// Sample normal map.
float3 normalInTangent1 = tex2D(g_samNormalMap1, texcoord1);
float3 normalInTangent2 = tex2D(g_samNormalMap2, texcoord2);
// Expand from [0, 1] compressed interval to true [-1, 1] interval.
normalInTangent1 = 2.0f * normalInTangent1 - 1.0f;
normalInTangent2 = 2.0f * normalInTangent2 - 1.0f;
// Average the two vectors.
float3 normalInTangent = normalize( 0.5f * ( normalInTangent1 + normalInTangent2));
// Compute the reflection vector.
float3 r = reflect(lightDirectionInTangent, normalInTangent);
// Determine how much (if any) specular light makes it into the eye.
float s = pow(max(dot(r, toEyeInTangent), 0.0f), g_structMaterial.specularPower);
// Determine the diffuse light intensity that strikes the vertex.
float d = max(dot(toLightInTangent, normalInTangent), 0.0f);
// If the diffuse light intensity is low, kill the specular lighting term.
// It doesn't look right to add specular light when the surface receives
// little diffuse light.
if(d <= 0.0f)
s = 0.0f;
// Compute the ambient, diffuse and specular terms separatly.
float3 spec = s * ( g_structMaterial.specular * g_structDirectionalLight.specular).rgb;
float3 diffuse = d * (g_structMaterial.diffuse*g_structDirectionalLight.diffuse.rgb);
float3 ambient = g_structMaterial.ambient * g_structDirectionalLight.ambient;
float3 final = ambient + diffuse + spec;
// Output the color and the alpha.
return float4(final, g_structMaterial.diffuse.a);
}
technique myTech
{
pass P0
{
//FillMode = WIREFRAME;
// Specify the vertex and pixel shader associated with this pass.
vertexShader = compile vs_3_0 myVertexEntry();
pixelShader = compile ps_3_0 myPixelEntry();
}
}
好了,收工,睡觉去了,这几天要写个柏林噪声出来!!!!!!!!!!!!
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