You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.6 KiB
HLSL
49 lines
1.6 KiB
HLSL
|
|
half frag_ao (v2f_ao i, int sampleCount, float3 samples[INPUT_SAMPLE_COUNT])
|
|
{
|
|
// read random normal from noise texture
|
|
half3 randN = tex2D (_RandomTexture, i.uvr).xyz * 2.0 - 1.0;
|
|
|
|
// read scene depth/normal
|
|
float4 depthnormal = tex2D (_CameraDepthNormalsTexture, i.uv);
|
|
float3 viewNorm;
|
|
float depth;
|
|
DecodeDepthNormal (depthnormal, depth, viewNorm);
|
|
depth *= _ProjectionParams.z;
|
|
float scale = _Params.x / depth;
|
|
|
|
// accumulated occlusion factor
|
|
float occ = 0.0;
|
|
for (int s = 0; s < sampleCount; ++s)
|
|
{
|
|
// Reflect sample direction around a random vector
|
|
half3 randomDir = reflect(samples[s], randN);
|
|
|
|
// Make it point to the upper hemisphere
|
|
half flip = (dot(viewNorm,randomDir)<0) ? 1.0 : -1.0;
|
|
randomDir *= -flip;
|
|
// Add a bit of normal to reduce self shadowing
|
|
randomDir += viewNorm * 0.3;
|
|
|
|
float2 offset = randomDir.xy * scale;
|
|
float sD = depth - (randomDir.z * _Params.x);
|
|
|
|
// Sample depth at offset location
|
|
float4 sampleND = tex2D (_CameraDepthNormalsTexture, i.uv + offset);
|
|
float sampleD;
|
|
float3 sampleN;
|
|
DecodeDepthNormal (sampleND, sampleD, sampleN);
|
|
sampleD *= _ProjectionParams.z;
|
|
float zd = saturate(sD-sampleD);
|
|
if (zd > _Params.y) {
|
|
// This sample occludes, contribute to occlusion
|
|
occ += pow(1-zd,_Params.z); // sc2
|
|
//occ += 1.0-saturate(pow(1.0 - zd, 11.0) + zd); // nullsq
|
|
//occ += 1.0/(1.0+zd*zd*10); // iq
|
|
}
|
|
}
|
|
occ /= sampleCount;
|
|
return 1-occ;
|
|
}
|
|
|