OrdinaryMagician/vkdoom_m
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Reduce AO sample count from 128 to 16

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Magnus Norddahl 2024-10-17 00:42:08 +02:00
commit 7907c27c7c
1 changed files with 4 additions and 2 deletions
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6
wadsrc/static/shaders/lightmap/trace_ambient_occlusion.glsl
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@ -7,17 +7,19 @@ float TraceAmbientOcclusion(vec3 origin, vec3 normal)
{
const float minDistance = 0.01;
const float aoDistance = 100;
const int SampleCount = 128;
const int SampleCount = 16;
vec3 N = normal;
vec3 up = abs(N.x) < abs(N.y) ? vec3(1.0, 0.0, 0.0) : vec3(0.0, 1.0, 0.0);
vec3 tangent = normalize(cross(up, N));
vec3 bitangent = cross(N, tangent);
int fragoffset = int(gl_FragCoord.x * 13.37 + gl_FragCoord.y * 6.66) % 9;
float ambience = 0.0f;
for (uint i = 0; i < SampleCount; i++)
{
vec2 Xi = Hammersley(i, SampleCount);
vec2 Xi = Hammersley(i * 9 + fragoffset, SampleCount * 9);
vec3 H = normalize(vec3(Xi.x * 2.0f - 1.0f, Xi.y * 2.0f - 1.0f, 1.5 - length(Xi)));
vec3 L = H.x * tangent + H.y * bitangent + H.z * N;
ambience += clamp(TraceAORay(origin, minDistance, L, aoDistance) / aoDistance, 0.0, 1.0);