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/**************************************************************************
*
* Copyright 2010 Luca Barbieri
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#define INPUT_PATCH_SIZE 3
#define OUTPUT_PATCH_SIZE 3
static const float PI = 3.141592653589793238462643f;
cbuffer cb_frame
{
float4x4 model;
float4x4 view_proj;
float disp_scale;
float disp_freq;
float tess_factor;
};
struct IA2VS
{
float3 position : POSITION;
};
struct VS2HS
{
float3 position : POSITION;
};
VS2HS vs(IA2VS input)
{
VS2HS result;
result.position = input.position;
return result;
}
struct HS2DS_PATCH
{
float tessouter[3] : SV_TessFactor;
float tessinner[1] : SV_InsideTessFactor;
};
struct HS2DS
{
float3 position : POSITION;
};
HS2DS_PATCH hs_patch(InputPatch<VS2HS, INPUT_PATCH_SIZE> ip)
{
HS2DS_PATCH result;
result.tessouter[0] = result.tessouter[1] = result.tessouter[2]
= result.tessinner[0] = tess_factor;
return result;
}
[domain("tri")]
[partitioning("fractional_even")]
[outputtopology("triangle_cw")]
[outputcontrolpoints(OUTPUT_PATCH_SIZE)]
[patchconstantfunc("hs_patch")]
HS2DS hs(InputPatch<VS2HS, INPUT_PATCH_SIZE> p, uint i : SV_OutputControlPointID)
{
HS2DS result;
result.position = p[i].position;
return result;
}
struct DS2PS
{
float4 position : SV_POSITION;
float3 objpos : OBJPOS;
// float3 worldpos : WORLDPOS;
float3 objnormal : OBJNORMAL;
float3 worldnormal : WORLDNORMAL;
};
float3 dnormf_dt(float3 f, float3 dfdt)
{
float ff = dot(f, f);
return (ff * dfdt - dot(f, dfdt) * f) / (ff * sqrt(ff));
}
float3 map(float3 p, float3 q, float3 r, float3 k)
{
return normalize(p * k.x + q * k.y + r * k.z);
}
float3 dmap_du(float3 p, float3 q, float3 r, float3 k)
{
return dnormf_dt(p * k.x + q * k.y + r * k.z, p);
}
float dispf(float v)
{
return cos(v * disp_freq);
}
float ddispf(float v)
{
return -sin(v * disp_freq) * disp_freq;
}
float disp(float3 k)
{
return dispf(k.x) * dispf(k.y) * dispf(k.z);
}
float ddisp_du(float3 k)
{
return ddispf(k.x) * dispf(k.y) * dispf(k.z);
}
float3 ddisp(float3 k)
{
float3 f = float3(dispf(k.x), dispf(k.y), dispf(k.z));
return float3(ddispf(k.x) * f.y * f.z, ddispf(k.y) * f.z * f.x, ddispf(k.z) * f.x * f.y);
}
[domain("tri")]
DS2PS ds(HS2DS_PATCH input,
float3 k : SV_DomainLocation,
const OutputPatch<HS2DS, OUTPUT_PATCH_SIZE> patch)
{
DS2PS result;
float3 s = map(patch[0].position, patch[1].position, patch[2].position, k);
float3 d = 1.0 + disp(s) * disp_scale;
result.objpos = s * d;
result.objpos /= (1.0 + disp_scale);
float3 worldpos = mul(model, float4(result.objpos, 1.0f));
result.position = mul(view_proj, float4(worldpos, 1.0f));
float3 dd = ddisp(s) * disp_scale;
/*
float3 ds_du = dmap_du(patch[0].position, patch[1].position, patch[2].position, k);
float3 ds_dv = dmap_du(patch[1].position, patch[2].position, patch[0].position, k.yzx);
float3 ds_dw = dmap_du(patch[2].position, patch[0].position, patch[1].position, k.zxy);
float3 ds_dU = ds_du - ds_dw;
float3 ds_dV = ds_dv - ds_dw;
float3 dc_dU = s * dot(dd, ds_dU) + ds_dU * d;
float3 dc_dV = s * dot(dd, ds_dV) + ds_dV * d;
*/
// this should be faster
float3 _u = normalize((abs(s.x) > abs(s.y)) ? float3(-s.z, 0, s.x) : float3(0, -s.z, s.y));
float3 _v = normalize(cross(s, _u));
float3 dc_dU = s * dot(dd, _u) + _u * d;
float3 dc_dV = s * dot(dd, _v) + _v * d;
result.objnormal = normalize(cross(dc_dU, dc_dV));
result.worldnormal = mul(model, result.objnormal);
return result;
}
float4 ps(DS2PS input) : SV_TARGET
{
float3 pseudoambient = float3(0.4, 0.4, 0.6);
float3 diffuse = float3(0.6, 0.6, 0.4);
float3 light = normalize(float3(0, 1, -1));
float4 r;
// r.xyz = normalize(input.objpos + 2 * input.objnormal);
r.xyz = pseudoambient * saturate(dot(normalize(input.objnormal), normalize(input.objpos)));
r.xyz += saturate(dot(light, normalize(input.worldnormal))) * diffuse;
r.w = 1;
return r;
}
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