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- Use naive trilinear interpolation when fetching embedded light
This commit is contained in:
Jozufozu 2024-06-29 17:58:55 -07:00
parent 6cd30b8164
commit cf2c11a37c
1 changed files with 31 additions and 7 deletions
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38
common/src/backend/resources/assets/flywheel/flywheel/internal/indirect/main.frag
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@ -63,17 +63,15 @@ vec2 _flw_lightAt(uint sectionOffset, uvec3 blockInSectionPos) {
uint block = (raw >> bitOffset) & 0xFu;
uint sky = (raw >> (bitOffset + 4u)) & 0xFu;
return vec2(block / 15., sky / 15.);
return vec2(block, sky);
}
bool _flw_embeddedLight(vec3 worldPos, out vec2 lightCoord) {
ivec3 blockPos = ivec3(floor(worldPos));
ivec3 sectionPos = blockPos >> 4;
uvec3 blockInSectionPos = (blockPos & 0xF) + 1;
// The lowest corner of the 2x2x2 area we'll be trilinear interpolating.
ivec3 basePosition = ivec3(round(worldPos)) - 1;
uint lightSectionIndex;
if (_flw_chunkCoordToSectionIndex(sectionPos, lightSectionIndex)) {
if (_flw_chunkCoordToSectionIndex(basePosition >> 4, lightSectionIndex)) {
// TODO: useful debug mode for this.
// flw_fragOverlay = ivec2(0, 3);
return false;
@ -81,7 +79,33 @@ bool _flw_embeddedLight(vec3 worldPos, out vec2 lightCoord) {
uint sectionOffset = lightSectionIndex * _FLW_LIGHT_SECTION_SIZE_INTS;
lightCoord = _flw_lightAt(sectionOffset, blockInSectionPos);
// Adjusted into 18x18x18 space
uvec3 blockInSectionPos = (basePosition & 0xF) + 1;
// Fetch everything for trilinear interpolation
// Hypothetically we could re-order these and do some calculations in-between fetches
// to help with latency hiding, but the compiler should be able to do that for us.
vec2 light000 = _flw_lightAt(sectionOffset, blockInSectionPos);
vec2 light001 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(0, 0, 1));
vec2 light010 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(0, 1, 0));
vec2 light011 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(0, 1, 1));
vec2 light100 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(1, 0, 0));
vec2 light101 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(1, 0, 1));
vec2 light110 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(1, 1, 0));
vec2 light111 = _flw_lightAt(sectionOffset, blockInSectionPos + uvec3(1, 1, 1));
// The distance our fragment is from the center of the lowest corner.
vec3 interpolant = worldPos - vec3(basePosition) - 0.5;
vec2 light00 = mix(light000, light001, interpolant.z);
vec2 light01 = mix(light010, light011, interpolant.z);
vec2 light10 = mix(light100, light101, interpolant.z);
vec2 light11 = mix(light110, light111, interpolant.z);
vec2 light0 = mix(light00, light01, interpolant.y);
vec2 light1 = mix(light10, light11, interpolant.y);
lightCoord = mix(light0, light1, interpolant.x) / 15.;
return true;
}