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use comparray;
fn section_build_geometry(pos: SectionPos) []Vertex = {
const section = getsection(pos) as *Section;
if (section.bstates.palette_size == 1
&& section.bstates.data_constant == 0) {
return [];
};
const neighbors = [
getsection(SectionPos { x = pos.x - 1, y = pos.y, z = pos.z }),
getsection(SectionPos { x = pos.x + 1, y = pos.y, z = pos.z }),
getsection(SectionPos { x = pos.x, y = pos.y - 1, z = pos.z }),
getsection(SectionPos { x = pos.x, y = pos.y + 1, z = pos.z }),
getsection(SectionPos { x = pos.x, y = pos.y, z = pos.z - 1 }),
getsection(SectionPos { x = pos.x, y = pos.y, z = pos.z + 1 }),
];
let vertices: []Vertex = alloc([], 1024);
for (let y = 0u8; y < 16; y += 1)
for (let z = 0u8; z < 16; z += 1)
for (let x = 0u8; x < 16; x += 1) {
const i = x | z << 4 | y: size << 8;
const bstate = comparray::lookup(§ion.bstates, comparray::get(§ion.bstates, i));
if (bstate == 0) continue;
const render_bstate = &BSTATES_RENDER[bstate];
for (let i = 0z; i < len(render_bstate.parts); i += 1) {
const part = &render_bstate.parts[i];
const geom = part.model.geom as *ModelGeom;
for (let j = 0z; j < len(geom.faces); j += 1) {
const face = &geom.faces[j];
if (face.cull_face != CullFace::NONE) {
let axis = 0u8;
for (true; axis += 1) {
if (part.swizzle >> axis >> axis & 3
== face.cull_face >> 1) break;
};
const flip = part.flags: u8 >> axis;
const sign = (face.cull_face: u8 ^ flip) & 1;
const cull_face = axis << 1 | sign;
let neighbor = [x, y, z];
const coord = &neighbor[axis];
*coord += (sign << 1) - 1;
const section_ = if (*coord & 0xf0 != 0)
neighbors[cull_face] else section;
*coord &= 0x0f;
match (section_) {
case let section_: *Section =>
const k = neighbor[0] | neighbor[2] << 4
| neighbor[1]: size << 8;
const bstate_ = comparray::lookup(§ion_.bstates, comparray::get(§ion_.bstates, k));
if ((bstate >= 77 && bstate <= 92 || !(bstate_ >= 77 && bstate_ <= 92))
&& len((BSTATES_RENDER[bstate_].parts[0].model.geom as *ModelGeom).faces) != 0) continue;
case null =>
if (axis != 1) continue;
};
};
let face_vertices: [4][3]u16 = [[0...]...];
for (let k = 0z; k < 4; k += 1) {
const vert = &face.vertices[k];
let vx = vert[part.swizzle & 3];
if (part.flags & BstateRenderPartFlags::FLIP_X != 0)
vx = 6144 - vx;
vx += x: u16 * 2048;
let vy = vert[part.swizzle >> 2 & 3];
if (part.flags & BstateRenderPartFlags::FLIP_Y != 0)
vy = 6144 - vy;
vy += y: u16 * 2048;
let vz = vert[part.swizzle >> 4];
if (part.flags & BstateRenderPartFlags::FLIP_Z != 0)
vz = 6144 - vz;
vz += z: u16 * 2048;
face_vertices[k] = [vx, vy, vz];
};
let normal = [
face.normal[part.swizzle & 3],
face.normal[part.swizzle >> 2 & 3],
face.normal[part.swizzle >> 4],
];
if (part.flags & BstateRenderPartFlags::FLIP_X != 0)
normal[0] = -normal[0];
if (part.flags & BstateRenderPartFlags::FLIP_Y != 0)
normal[1] = -normal[1];
if (part.flags & BstateRenderPartFlags::FLIP_Z != 0)
normal[2] = -normal[2];
const sprite = part.model.textures[face.texture];
const tex_left = face.texcoord[0];
const tex_top = face.texcoord[1];
const tex_right = face.texcoord[2];
const tex_bottom = face.texcoord[3];
const flags_left: VertexFlags = if (tex_left < tex_right) 0 else VertexFlags::U_EXCL;
const flags_top: VertexFlags = if (tex_top < tex_bottom) 0 else VertexFlags::V_EXCL;
const flags_right = flags_left ^ VertexFlags::U_EXCL;
const flags_bottom = flags_top ^ VertexFlags::V_EXCL;
let texcoord: [4][2]u16 = [
[tex_left, tex_top],
[tex_left, tex_bottom],
[tex_right, tex_bottom],
[tex_right, tex_top],
];
let flags = [
flags_left | flags_top,
flags_left | flags_bottom,
flags_right | flags_bottom,
flags_right | flags_top,
];
const mask = 1 << face.dir;
const flip_u = part.flip_u & mask != 0;
const flip_v = part.flip_v & mask != 0;
const swap_uv = part.swap_uv & mask != 0;
const tex_flipped = tex_left < tex_right
!= tex_top < tex_bottom;
// flipping the texture reverses the apparent
// rotation wrt. the rotation applied to the
// texcoords, so we need to compensate.
const (flip_u, flip_v) = if (tex_flipped)
(flip_v, flip_u) else (flip_u, flip_v);
for (let k = 0u8; k < 4; k += 1) {
const uv = &texcoord[k];
const f = &flags[k];
if (swap_uv) {
*uv = [uv[1], uv[0]];
const u_excl = *f & VertexFlags::U_EXCL;
const v_excl = *f & VertexFlags::V_EXCL;
*f = u_excl << 1 | v_excl >> 1;
};
if (flip_u) {
uv[0] = 128 - uv[0];
*f ^= VertexFlags::U_EXCL;
};
if (flip_v) {
uv[1] = 128 - uv[1];
*f ^= VertexFlags::V_EXCL;
};
uv[0] = sprite.x: u16 + (sprite.width * uv[0] >> 7): u16;
uv[1] = sprite.y: u16 + (sprite.height * uv[1] >> 7): u16;
};
append(vertices, [
Vertex { position = face_vertices[0], normal = normal, texcoord = texcoord[face.rotation & 3], flags = flags[face.rotation & 3] },
Vertex { position = face_vertices[1], normal = normal, texcoord = texcoord[1 + face.rotation & 3], flags = flags[1 + face.rotation & 3] },
Vertex { position = face_vertices[2], normal = normal, texcoord = texcoord[2 + face.rotation & 3], flags = flags[2 + face.rotation & 3] },
Vertex { position = face_vertices[2], normal = normal, texcoord = texcoord[2 + face.rotation & 3], flags = flags[2 + face.rotation & 3] },
Vertex { position = face_vertices[3], normal = normal, texcoord = texcoord[3 + face.rotation & 3], flags = flags[3 + face.rotation & 3] },
Vertex { position = face_vertices[0], normal = normal, texcoord = texcoord[face.rotation & 3], flags = flags[face.rotation & 3] },
]...);
};
};
};
return vertices;
};
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