废弃了两年多的骨骼动画终于又动起来了。

算了算，上次整里骨骼动画的代码要是2006年了。那会整理一坨临时的骨骼动画代码后再也没折腾过。

这次D10的架子搭好后终于花了一个周末让那一大陀骨骼动画的代码重新动起来了。

用D10做GPU的skin还真是简单，晚上顺手把cbuffer/tbuffer/Buffer三种模式的Bone数据传递模式都支持上了。再也不用为骨骼个数限制而烦恼了。

下一步，做光照和渲染系统

以下是SkinAni.hlsl的代码

/*
///{{Slot = VM_DoSkin
Input
{
float4 Pos : POSITION;
float4 Nor : NORMAL;
float4 Color : COLOR;
float4 Weights : BLENDWEIGHT;
int4 BoneIdxs : BLENDINDICES;
}

Output class=VM_SkinRet
{
float4 Pos: TPOSITION;
float4 Nor: TNORMAL;
float4 Tan: TTANGENT;
}
///}}
*/

///{{Declaration
struct SKINMESHVS_INPUT
{
float4 Pos : POSITION;
float4 Nor : NORMAL;
float4 Color : COLOR;
float4 Tan : TANGENT;
float4 Weights : BLENDWEIGHT;
int4 BoneIdxs : BLENDINDICES;
float2 Tex : TEXCOORD;
};

struct VM_SkinRet
{
float4 Pos;
float4 Tan;
float4 Nor;
};
#define _CBUFFER_ANI_
#ifdef _CBUFFER_ANI_
tbuffer BoneFrame
{
float4x4 matBone[256];
}
#else
Buffer<float4> BoneFrame;//[256]
#endif

VM_SkinRet VM_DoSkin(float4 Pos , float4 Nor , float4 Tan , float4 Weights , int4 BoneIdxs);
#undef VS_INPUT
#define VS_INPUT SKINMESHVS_INPUT
///}}

///{{SourceCode
float4x4 ToNormalMat(float4x4 mat)
{
float4x4 matNormal = mat;
matNormal[3] = float4(0.0f,0.0f,0.0f,1.0f);
matNormal[0][3] = 0.0f;
matNormal[1][3] = 0.0f;
matNormal[2][3] = 0.0f;
return matNormal;
}

VM_SkinRet VM_DoSkin(float4 Pos , float4 Nor , float4 Tan , float4 Weights , int4 BoneIdxs)
{
VM_SkinRet ret;

float vWeight[4];
vWeight[0] = Weights.x;
vWeight[1] = Weights.y;
vWeight[2] = Weights.z;
vWeight[3] = Weights.w;

int vBoneIdxs[4];
vBoneIdxs[0] = BoneIdxs.x;
vBoneIdxs[1] = BoneIdxs.y;
vBoneIdxs[2] = BoneIdxs.z;
vBoneIdxs[3] = BoneIdxs.w;


float4 vPos = float4(0.0f,0.0f,0.0f,0.0f);
float4 vNor = float4(0.0f,0.0f,0.0f,0.0f);
float4 vTan = float4(0.0f,0.0f,0.0f,0.0f);

for(int i = 0 ; i < 4 ; i ++ )
{
#ifdef _CBUFFER_ANI_
float4x4 matPos = matBone[ vBoneIdxs[i] ];
#else
int iBone = vBoneIdxs[i];
iBone *= 4;
float4 row1 = BoneFrame.Load( iBone );
float4 row2 = BoneFrame.Load( iBone + 1 );
float4 row3 = BoneFrame.Load( iBone + 2 );
float4 row4 = BoneFrame.Load( iBone + 3 );

float4x4 matPos = transpose(float4x4( row1, row2, row3, row4 ));
#endif

float4x4 matNor = ToNormalMat(matPos);
vPos += vWeight[i] * mul( matPos , Pos );
vNor += vWeight[i] * mul( matNor , Nor );
vTan += vWeight[i] * mul( matNor , Tan );
}

vPos.w = 1.0f;
vPos = mul( matWorld , vPos);
vPos = mul( matView , vPos);
ret.Pos = mul( matProject , vPos);

float matNor = ToNormalMat(matView);
ret.Nor = mul( matNor , vNor ); ;
ret.Tan = mul( matNor , vTan ); ;

return ret;
}
///}}