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#include "shaderCommon.h"
cbuffer constBuf : register(b0)
{
PointShaderConst gParams;
};
Texture2D<float> shadowTexture : register(t0); // shadow map
SamplerComparisonState shadowSampler : register(s0); // texture sample used to sample depth from shadow texture in this sample
float sqr(float x) { return x * x; }
float shadowSample(float4 lightOffsetPosition)
{
float3 pos = float3(lightOffsetPosition.xyz / lightOffsetPosition.w);
//float3 uvw = (pos.xyz * 0.5) + vec3(0.5);
float3 uvw = (pos.xyz * float3(0.5, 0.5, 1.0)) + float3(0.5, 0.5, 0.0);
// user clip
if (uvw.x < 0.0 || uvw.x > 1.0)
return 1.0;
if (uvw.y < 0.0 || uvw.y > 1.0)
return 1.0;
float s = 0.0;
float radius = 0.002;
// flip uv y-coordinate
uvw.y = 1.0f - uvw.y;
[unroll]
for (int i = 0; i < 8; i++)
{
float2 shadowTaps = gParams.shadowTaps[i].xy;
shadowTaps.y = 1.0f - shadowTaps.y;
//s += shadow2D(shadowTex, vec3(uvw.xy + shadowTaps[i] * radius, uvw.z)).r;
s += shadowTexture.SampleCmp(shadowSampler, uvw.xy + shadowTaps * radius, uvw.z);
}
s /= 8.0;
return s;
}
float4 pointPS(PointGeoOut input) : SV_TARGET
{
const float spotMin = gParams.spotMin;
const float spotMax = gParams.spotMax;
// calculate normal from texture coordinates
float3 normal;
normal.xy = input.texCoord * float2(2.0, -2.0) + float2(-1.0, 1.0);
float mag = dot(normal.xy, normal.xy);
if (mag > 1.0)
{
discard; // kill pixels outside circle
}
normal.z = sqrt(1.0 - mag);
if (gParams.mode == 2)
{
float alpha = normal.z * input.reflectance.w;
return float4(input.reflectance.xyz * alpha, alpha);
}
// calculate lighting
float shadow = shadowSample(input.lightOffsetPosition);
float3 lPos = float3(input.lightOffsetPosition.xyz / input.lightOffsetPosition.w);
float attenuation = max(smoothstep(spotMax, spotMin, dot(lPos.xy, lPos.xy)), 0.05);
float3 diffuse = float3(0.9, 0.9, 0.9);
float3 reflectance = input.reflectance.xyz;
float3 lo = diffuse * reflectance * max(0.0, sqr(-dot(input.viewLightDir, normal) * 0.5 + 0.5)) * max(0.2, shadow) * attenuation;
const float tmp = 1.0 / 2.2;
return float4(pow(abs(lo), float3(tmp, tmp, tmp)), 1.0);
}
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