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float2 UnpackUV(float uv)
{
float2 output;
output.x = floor(uv / 4096);
output.y = uv - 4096 * output.x;
return output * 0.001953125;
}
fixed4 GetColor(half d, fixed4 faceColor, fixed4 outlineColor, half outline, half softness)
{
half faceAlpha = 1-saturate((d - outline * 0.5 + softness * 0.5) / (1.0 + softness));
half outlineAlpha = saturate((d + outline * 0.5)) * sqrt(min(1.0, outline));
faceColor.rgb *= faceColor.a;
outlineColor.rgb *= outlineColor.a;
faceColor = lerp(faceColor, outlineColor, outlineAlpha);
faceColor *= faceAlpha;
return faceColor;
}
float3 GetSurfaceNormal(float4 h, float bias)
{
bool raisedBevel = step(1, fmod(_ShaderFlags, 2));
h += bias+_BevelOffset;
float bevelWidth = max(.01, _OutlineWidth+_BevelWidth);
// Track outline
h -= .5;
h /= bevelWidth;
h = saturate(h+.5);
if(raisedBevel) h = 1 - abs(h*2.0 - 1.0);
h = lerp(h, sin(h*3.141592/2.0), _BevelRoundness);
h = min(h, 1.0-_BevelClamp);
h *= _Bevel * bevelWidth * _GradientScale * -2.0;
float3 va = normalize(float3(1.0, 0.0, h.y - h.x));
float3 vb = normalize(float3(0.0, -1.0, h.w - h.z));
return cross(va, vb);
}
float3 GetSurfaceNormal(float2 uv, float bias, float3 delta)
{
// Read "height field"
float4 h = {tex2D(_MainTex, uv - delta.xz).a,
tex2D(_MainTex, uv + delta.xz).a,
tex2D(_MainTex, uv - delta.zy).a,
tex2D(_MainTex, uv + delta.zy).a};
return GetSurfaceNormal(h, bias);
}
float3 GetSpecular(float3 n, float3 l)
{
float spec = pow(max(0.0, dot(n, l)), _Reflectivity);
return _SpecularColor.rgb * spec * _SpecularPower;
}
float4 GetGlowColor(float d, float scale)
{
float glow = d - (_GlowOffset*_ScaleRatioB) * 0.5 * scale;
float t = lerp(_GlowInner, (_GlowOuter * _ScaleRatioB), step(0.0, glow)) * 0.5 * scale;
glow = saturate(abs(glow/(1.0 + t)));
glow = 1.0-pow(glow, _GlowPower);
glow *= sqrt(min(1.0, t)); // Fade off glow thinner than 1 screen pixel
return float4(_GlowColor.rgb, saturate(_GlowColor.a * glow * 2));
}
float4 BlendARGB(float4 overlying, float4 underlying)
{
overlying.rgb *= overlying.a;
underlying.rgb *= underlying.a;
float3 blended = overlying.rgb + ((1-overlying.a)*underlying.rgb);
float alpha = underlying.a + (1-underlying.a)*overlying.a;
return float4(blended, alpha);
}
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