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voxel-rs
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Cull interior voxels from gpu brickmap upload

This commit is contained in:
Jarrod Doyle 2023-05-05 10:47:08 +01:00
parent 12cde87246
commit a4179fa307
Signed by: Jayrude
GPG Key ID: 38B57B16E7C0ADF7
1 changed files with 49 additions and 10 deletions
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59
src/voxel/brickmap.rs
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@ -186,29 +186,68 @@ impl BrickmapManager {
if chunk_idx % 3 == 0 || chunk_idx % 5 == 0 || chunk_idx % 7 == 0 {
self.update_brickgrid_element(context, chunk_idx, 0)
} else {
// Build the voxel data
let mut bitmask_data = [0xFFFFFFFF as u32; 16];
let mut albedo_data = Vec::<u32>::new();
// Generate full data
let mut chunk = [(false, 0u32); 512];
for z in 0..8 {
let mut entry = 0u64;
for y in 0..8 {
for x in 0..8 {
let idx = x + y * 8;
let idx = (x + y * 8 + z * 8 * 8) as usize;
// Just checks if the point is in the sphere
let pos = glam::vec3(x as f32, y as f32, z as f32);
if (pos - sphere_center).length_squared() <= sphere_r2 {
entry += 1 << idx;
// Pack the local position as a colour
let mut albedo = 0u32;
albedo += ((x + 1) * 32 - 1) << 24;
albedo += ((y + 1) * 32 - 1) << 16;
albedo += ((z + 1) * 32 - 1) << 8;
albedo += 255;
albedo_data.push(albedo);
chunk[idx] = (true, albedo);
}
}
}
bitmask_data[2 * z as usize] = (entry & 0xFFFFFFFF).try_into().unwrap();
bitmask_data[2 * z as usize + 1] =
((entry >> 32) & 0xFFFFFFFF).try_into().unwrap();
}
// Cull interior voxels
let mut bitmask_data = [0xFFFFFFFF as u32; 16];
let mut albedo_data = Vec::<u32>::new();
for z in 0..8 {
// Each z level contains two bitmask segments of voxels
let mut entry = 0u64;
for y in 0..8 {
for x in 0..8 {
// Ignore non-solids
let idx = x + y * 8 + z * 8 * 8;
if !chunk[idx].0 {
continue;
}
// A voxel is on the surface if at least one of it's
// cardinal neighbours is non-solid. Also for simplicity if
// it's on the edge of the chunk
let surface_voxel: bool;
if x == 0 || x == 7 || y == 0 || y == 7 || z == 0 || z == 7 {
surface_voxel = true;
} else {
surface_voxel = !(chunk[idx + 1].0
&& chunk[idx - 1].0
&& chunk[idx + 8].0
&& chunk[idx - 8].0
&& chunk[idx + 64].0
&& chunk[idx - 64].0);
}
// Set the appropriate bit in the z entry and add the shading
// data
if surface_voxel {
entry += 1 << (x + y * 8);
albedo_data.push(chunk[idx].1);
}
}
}
let offset = 2 * z as usize;
bitmask_data[offset] = (entry & 0xFFFFFFFF).try_into().unwrap();
bitmask_data[offset + 1] = ((entry >> 32) & 0xFFFFFFFF).try_into().unwrap();
}
// Update the brickgrid index