/******************************************************************************/
#include "!Header.h"
/******************************************************************************/
#define PARAMS             \
   uniform Bool skin      ,\
   uniform Int  textures  ,\
   uniform Bool test_blend,\
   uniform Int  fx        ,\
   uniform Bool tesselate
/******************************************************************************/
struct VS_PS
{
   Vec  pos:TEXCOORD0,
        nrm:TEXCOORD1;
   Vec2 tex:TEXCOORD2;
};
/******************************************************************************/
// VS
/******************************************************************************/
void VS
(
   VtxInput vtx,

   out VS_PS O,
   out Vec4  O_vtx:POSITION,

   PARAMS
)
{
   Vec  pos=vtx.pos();
   VecH nrm; if(tesselate)nrm=vtx.nrm();

   if(fx==FX_LEAF)
   {
      if(tesselate)BendLeaf(vtx.hlp(), pos, nrm);
      else         BendLeaf(vtx.hlp(), pos);
   }
   if(fx==FX_LEAFS)
   {
      if(tesselate)BendLeafs(vtx.hlp(), vtx.size(), pos, nrm);
      else         BendLeafs(vtx.hlp(), vtx.size(), pos);
   }

   if(!skin)
   {
   #if MODEL>=SM_4 || MODEL==SM_GL
      if(true) // instance
      {
                      O.pos=          TransformPos(pos, vtx.instance());
         if(tesselate)O.nrm=Normalize(TransformDir(nrm, vtx.instance()));
         if(fx==FX_GRASS)BendGrass(pos, O.pos, vtx.instance());
      }else
   #endif
      {
                      O.pos=          TransformPos(pos);
         if(tesselate)O.nrm=Normalize(TransformDir(nrm));
         if(fx==FX_GRASS)BendGrass(pos, O.pos);
      }
   }else
   {
      VecI bone=vtx.bone();
                   O.pos=          TransformPos(pos, bone, vtx.weight());
      if(tesselate)O.nrm=Normalize(TransformDir(nrm, bone, vtx.weight()));
   }

   if(textures)O.tex=vtx.tex();
               O_vtx=Project(O.pos);
}
/******************************************************************************/
// PS
/******************************************************************************/
void PS
(
   VS_PS I,
#if MODEL==SM_3
   out Vec4 ret:COLOR,
#endif

   PARAMS
)
{
   if(textures==1)clip(Tex(Col, I.tex).a+(test_blend ? (MaterialAlpha()*0.5f-1) : (MaterialAlpha()-1)));else
   if(textures==2)clip(Tex(Nrm, I.tex).a+(test_blend ? (MaterialAlpha()*0.5f-1) : (MaterialAlpha()-1))); // #MaterialTextureChannelOrder
#if MODEL==SM_3
   ret=0;
#endif
}
/******************************************************************************/
// HULL / DOMAIN
/******************************************************************************/
#if MODEL>=SM_4
HSData HSConstant(InputPatch<VS_PS,3> I) {return GetHSData(I[0].pos, I[1].pos, I[2].pos, I[0].nrm, I[1].nrm, I[2].nrm, true);}
[maxtessfactor(5.0)]
[domain("tri")]
[partitioning("fractional_odd")] // use 'odd' because it supports range from 1.0 ('even' supports range from 2.0)
[outputtopology("triangle_cw")]
[patchconstantfunc("HSConstant")]
[outputcontrolpoints(3)]
VS_PS HS
(
   InputPatch<VS_PS,3> I, UInt cp_id:SV_OutputControlPointID,
   PARAMS
)
{
   VS_PS O;
               O.pos=I[cp_id].pos;
               O.nrm=I[cp_id].nrm;
   if(textures)O.tex=I[cp_id].tex;
   return O;
}
/******************************************************************************/
[domain("tri")]
void DS
(
   HSData hs_data, const OutputPatch<VS_PS,3> I, Vec B:SV_DomainLocation,

   out VS_PS O,
   out Vec4  O_vtx:POSITION,

   PARAMS
)
{
   if(textures)O.tex=I[0].tex*B.z + I[1].tex*B.x + I[2].tex*B.y;

   SetDSPosNrm(O.pos, O.nrm, I[0].pos, I[1].pos, I[2].pos, I[0].nrm, I[1].nrm, I[2].nrm, B, hs_data, false, 0);
   O_vtx=Project(O.pos);
}
#endif
/******************************************************************************/
// TECHNIQUES
/******************************************************************************/
CUSTOM_TECHNIQUE
/******************************************************************************/