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MULTIPLE VOXEL GROUPS

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shadow cat
2024-06-06 01:38:57 -04:00
parent 02f5a94fe5
commit 2fe5d2ecfe
3 changed files with 131 additions and 51 deletions
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130
src/client/render/voxel/shader.wgsl
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@@ -44,14 +44,9 @@ fn vs_main(
// Fragment shader
const X_AXIS = vec3<f32>(1.0, 0.0, 0.0);
const Y_AXIS = vec3<f32>(0.0, 1.0, 0.0);
const Z_AXIS = vec3<f32>(0.0, 0.0, 1.0);
const AXIS = mat3x3<f32>(X_AXIS, Y_AXIS, Z_AXIS);
const ZERO3F = vec3<f32>(0.0);
const ZERO2F = vec2<f32>(0.0);
const NO_COLOR = vec4<f32>(0.0);
const DEPTH = 20;
@fragment
fn fs_main(
@@ -65,87 +60,128 @@ fn fs_main(
1.0
);
let group = voxel_groups[0];
// move to position in world
let dir_view = view.transform * vec4<f32>(normalize(pixel_pos), 0.0);
let pos_view = view.transform * vec4<f32>(pixel_pos, 1.0);
var depths = array<f32,DEPTH>();
var colors = array<vec4<f32>,DEPTH>();
for (var gi: u32 = 0; gi < arrayLength(&voxel_groups); gi = gi + 1) {
draw_group(gi, pos_view, dir_view, &depths, &colors);
}
var color = vec4<f32>(0.0);
for(var di = 0; di < DEPTH; di += 1) {
// p sure if it can't unroll colors the performance dies; switch to buffer
let vcolor = colors[di];
color += vec4<f32>(vcolor.xyz * vcolor.a * (1.0 - color.a), (1.0 - color.a) * vcolor.a);
if vcolor.a == 0.0 || color.a >= 0.99999 {
return color;
}
}
return color;
}
fn draw_group(
gi: u32, pos_view: vec4<f32>, dir_view: vec4<f32>,
depths: ptr<function, array<f32, DEPTH>>,
colors: ptr<function, array<vec4<f32>,DEPTH>>,
) {
let group = voxel_groups[gi];
let dim_f = vec3<f32>(group.dimensions);
let dim_i = vec3<i32>(group.dimensions);
// transform position so that group is at 0,0 & find direction
let transform = group.transform * view.transform;
let dir = (transform * vec4<f32>(normalize(pixel_pos), 0.0)).xyz;
var pos = (transform * vec4<f32>(pixel_pos, 1.0)).xyz;
// transform so that group is at 0,0
var pos = (group.transform * pos_view).xyz;
let dir = (group.transform * dir_view).xyz;
let dir_if = sign(dir);
// find where ray intersects with group
let plane_point = (vec3<f32>(1.0) - sign(dir)) / 2.0 * dim_f;
let plane_point = (vec3<f32>(1.0) - dir_if) / 2.0 * dim_f;
var t_offset = 0.0;
if outside3f(pos, ZERO3F, dim_f) {
// x = td + p, solve for t
let t = (plane_point - pos) / dir;
// time of intersection; x = td + p, solve for t
let t_i = (plane_point - pos) / dir;
// points of intersection
let px = pos + t.x * dir;
let py = pos + t.y * dir;
let pz = pos + t.z * dir;
let px = pos + t_i.x * dir;
let py = pos + t_i.y * dir;
let pz = pos + t_i.z * dir;
// check if point is in bounds
let hit = vec3<bool>(
inside2f(px.yz, ZERO2F, dim_f.yz),
inside2f(py.xz, ZERO2F, dim_f.xz),
inside2f(pz.xy, ZERO2F, dim_f.xy),
) && (t > ZERO3F);
) && (t_i > ZERO3F);
if !any(hit) {
return NO_COLOR;
return;
}
pos = select(select(pz, py, hit.y), px, hit.x);
t_offset = select(select(t_i.z, t_i.y, hit.y), t_i.x, hit.x);
}
var vox_pos = clamp(vec3<i32>(pos), vec3<i32>(0), dim_i - vec3<i32>(1));
let dir_if = sign(dir) * ceil(abs(dir));
let dir_i = vec3<i32>(dir_if);
// time to move 1 unit using dir
let inc_t = abs(1.0 / dir);
let corner = vec3<f32>(vox_pos) + vec3<f32>(0.5, 0.5, 0.5) + dir_if / 2.0;
let corner = vec3<f32>(vox_pos) + vec3<f32>(0.5) + dir_if / 2.0;
// time of next plane hit for each direction
var next_t = inc_t * abs(pos - corner);
var color = NO_COLOR;
var alpha = 0.0;
var safety = 0;
var t = 0.0;
var prev_t = t;
var depth = 0;
loop {
// should prolly remove when gaming
safety += 1;
let i = u32(vox_pos.x + vox_pos.y * dim_i.x + vox_pos.z * dim_i.x * dim_i.y) + group.offset;
let vcolor = unpack4x8unorm(voxels[i]);
color += vec4<f32>(vcolor.xyz * vcolor.a * (1.0 - color.a), (1.0 - color.a) * vcolor.a);
if color.a >= 1.0 {
return color;
}
var vcolor = unpack4x8unorm(voxels[i]);
// select next voxel to move to next based on least time
if next_t.x < next_t.y && next_t.x < next_t.z {
vox_pos.x += dir_i.x;
next_t.x += inc_t.x;
if vox_pos.x < 0 || vox_pos.x >= dim_i.x {
return color;
let axis = select(select(2, 1, next_t.y < next_t.z), 0, next_t.x < next_t.y && next_t.x < next_t.z);
prev_t = t;
t = next_t[axis];
vox_pos[axis] += dir_i[axis];
next_t[axis] += inc_t[axis];
// hit a voxel
if vcolor.a > 0.0 {
let full_t = t_offset + prev_t;
// skip closer depth hits, or completely if behind opaque
while (*depths)[depth] < full_t && (*colors)[depth].a != 0.0 {
depth += 1;
if depth >= DEPTH || (*colors)[depth].a == 1.0 {
return;
}
}
} else if next_t.y < next_t.z {
vox_pos.y += dir_i.y;
next_t.y += inc_t.y;
if vox_pos.y < 0 || vox_pos.y >= dim_i.y {
return color;
}
} else {
vox_pos.z += dir_i.z;
next_t.z += inc_t.z;
if vox_pos.z < 0 || vox_pos.z >= dim_i.z {
return color;
var move_d = depth;
// move further depth hits back
while move_d < DEPTH - 1 && (*colors)[move_d].a != 0.0 {
(*colors)[move_d + 1] = (*colors)[move_d];
(*depths)[move_d + 1] = (*depths)[move_d];
move_d += 1;
}
// add hit
(*depths)[depth] = full_t;
(*colors)[depth] = vcolor;
depth += 1;
alpha += (1.0 - alpha) * vcolor.a;
}
safety += 1;
if safety > 1000 {
break;
if alpha >= 0.9999 || depth >= DEPTH
|| vox_pos[axis] < 0 || vox_pos[axis] >= dim_i[axis]
|| safety > 1000 {
return;
}
}
return vec4<f32>(1.0, 0.0, 0.0, 1.0);
}
fn outside3f(v: vec3<f32>, low: vec3<f32>, high: vec3<f32>) -> bool {