mirror of
https://github.com/PixelGuys/Cubyz.git
synced 2025-08-03 03:06:55 -04:00
254546c789
Resolves: #1600 --------- Co-authored-by: IntegratedQuantum <43880493+IntegratedQuantum@users.noreply.github.com>
313 lines
11 KiB
Zig
313 lines
11 KiB
Zig
const std = @import("std");
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const main = @import("main");
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const blocks = main.blocks;
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const Block = blocks.Block;
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const Neighbor = main.chunk.Neighbor;
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const ModelIndex = main.models.ModelIndex;
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const rotation = main.rotation;
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const Degrees = rotation.Degrees;
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const RayIntersectionResult = rotation.RayIntersectionResult;
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const RotationMode = rotation.RotationMode;
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const vec = main.vec;
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const Mat4f = vec.Mat4f;
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const Vec2f = vec.Vec2f;
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const Vec3f = vec.Vec3f;
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const Vec3i = vec.Vec3i;
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const ZonElement = main.ZonElement;
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var modelIndex: ?ModelIndex = null;
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fn subBlockMask(x: u1, y: u1, z: u1) u8 {
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return @as(u8, 1) << ((@as(u3, x)*2 + @as(u3, y))*2 + z);
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}
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fn hasSubBlock(stairData: u8, x: u1, y: u1, z: u1) bool {
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return stairData & subBlockMask(x, y, z) == 0;
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}
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pub fn rotateZ(data: u16, angle: Degrees) u16 {
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@setEvalBranchQuota(65_536);
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comptime var rotationTable: [4][256]u8 = undefined;
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comptime for(0..4) |a| {
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for(0..256) |old| {
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var new: u8 = 0b11_11_11_11;
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for(0..2) |i| for(0..2) |j| for(0..2) |k| {
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const sin: f32 = @sin((std.math.pi/2.0)*@as(f32, @floatFromInt(a)));
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const cos: f32 = @cos((std.math.pi/2.0)*@as(f32, @floatFromInt(a)));
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const x: f32 = (@as(f32, @floatFromInt(i)) - 0.5)*2.0;
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const y: f32 = (@as(f32, @floatFromInt(j)) - 0.5)*2.0;
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const rX = @intFromBool(x*cos - y*sin > 0);
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const rY = @intFromBool(x*sin + y*cos > 0);
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if(hasSubBlock(@intCast(old), @intCast(i), @intCast(j), @intCast(k))) {
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new &= ~subBlockMask(rX, rY, @intCast(k));
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}
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};
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rotationTable[a][old] = new;
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}
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};
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if(data >= 256) return 0;
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return rotationTable[@intFromEnum(angle)][data];
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}
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pub fn init() void {}
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pub fn deinit() void {}
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pub fn reset() void {
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modelIndex = null;
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}
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const GreedyFaceInfo = struct {min: Vec2f, max: Vec2f};
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fn mergeFaces(faceVisible: [2][2]bool, mem: []GreedyFaceInfo) []GreedyFaceInfo {
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var faces: usize = 0;
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if(faceVisible[0][0]) {
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if(faceVisible[0][1]) {
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if(faceVisible[1][0] and faceVisible[1][1]) {
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// One big face:
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mem[faces] = .{.min = .{0, 0}, .max = .{1, 1}};
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faces += 1;
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} else {
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mem[faces] = .{.min = .{0, 0}, .max = .{0.5, 1}};
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faces += 1;
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if(faceVisible[1][0]) {
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mem[faces] = .{.min = .{0.5, 0}, .max = .{1, 0.5}};
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faces += 1;
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}
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if(faceVisible[1][1]) {
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mem[faces] = .{.min = .{0.5, 0.5}, .max = .{1, 1}};
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faces += 1;
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}
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}
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} else {
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if(faceVisible[1][0]) {
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mem[faces] = .{.min = .{0, 0}, .max = .{1.0, 0.5}};
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faces += 1;
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} else {
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mem[faces] = .{.min = .{0, 0}, .max = .{0.5, 0.5}};
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faces += 1;
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}
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if(faceVisible[1][1]) {
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mem[faces] = .{.min = .{0.5, 0.5}, .max = .{1, 1}};
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faces += 1;
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}
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}
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} else {
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if(faceVisible[0][1]) {
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if(faceVisible[1][1]) {
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mem[faces] = .{.min = .{0, 0.5}, .max = .{1, 1}};
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faces += 1;
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} else {
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mem[faces] = .{.min = .{0, 0.5}, .max = .{0.5, 1}};
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faces += 1;
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}
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if(faceVisible[1][0]) {
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mem[faces] = .{.min = .{0.5, 0}, .max = .{1, 0.5}};
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faces += 1;
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}
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} else {
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if(faceVisible[1][0]) {
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if(faceVisible[1][1]) {
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mem[faces] = .{.min = .{0.5, 0}, .max = .{1, 1.0}};
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faces += 1;
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} else {
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mem[faces] = .{.min = .{0.5, 0}, .max = .{1, 0.5}};
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faces += 1;
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}
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} else if(faceVisible[1][1]) {
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mem[faces] = .{.min = .{0.5, 0.5}, .max = .{1, 1}};
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faces += 1;
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}
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}
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}
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return mem[0..faces];
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}
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pub fn createBlockModel(_: Block, _: *u16, _: ZonElement) ModelIndex {
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if(modelIndex) |idx| return idx;
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for(0..256) |i| {
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var quads = main.List(main.models.QuadInfo).init(main.stackAllocator);
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defer quads.deinit();
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for(Neighbor.iterable) |neighbor| {
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const xComponent = @abs(neighbor.textureX());
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const yComponent = @abs(neighbor.textureY());
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const normal = Vec3i{neighbor.relX(), neighbor.relY(), neighbor.relZ()};
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const zComponent = @abs(normal);
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const zMap: [2]@Vector(3, u32) = if(@reduce(.Add, normal) > 0) .{@splat(0), @splat(1)} else .{@splat(1), @splat(0)};
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var visibleFront: [2][2]bool = undefined;
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var visibleMiddle: [2][2]bool = undefined;
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for(0..2) |x| {
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for(0..2) |y| {
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const xSplat: @TypeOf(xComponent) = @splat(@intCast(x));
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const ySplat: @TypeOf(xComponent) = @splat(@intCast(y));
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const posFront = xComponent*xSplat + yComponent*ySplat + zComponent*zMap[1];
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const posBack = xComponent*xSplat + yComponent*ySplat + zComponent*zMap[0];
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visibleFront[x][y] = hasSubBlock(@intCast(i), @intCast(posFront[0]), @intCast(posFront[1]), @intCast(posFront[2]));
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visibleMiddle[x][y] = !visibleFront[x][y] and hasSubBlock(@intCast(i), @intCast(posBack[0]), @intCast(posBack[1]), @intCast(posBack[2]));
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}
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}
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const xAxis = @as(Vec3f, @floatFromInt(neighbor.textureX()));
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const yAxis = @as(Vec3f, @floatFromInt(neighbor.textureY()));
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const zAxis = @as(Vec3f, @floatFromInt(normal));
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// Greedy mesh it:
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var faces: [2]GreedyFaceInfo = undefined;
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const frontFaces = mergeFaces(visibleFront, &faces);
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for(frontFaces) |*face| {
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var xLower = @abs(xAxis)*@as(Vec3f, @splat(face.min[0]));
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var xUpper = @abs(xAxis)*@as(Vec3f, @splat(face.max[0]));
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if(@reduce(.Add, xAxis) < 0) std.mem.swap(Vec3f, &xLower, &xUpper);
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var yLower = @abs(yAxis)*@as(Vec3f, @splat(face.min[1]));
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var yUpper = @abs(yAxis)*@as(Vec3f, @splat(face.max[1]));
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if(@reduce(.Add, yAxis) < 0) std.mem.swap(Vec3f, &yLower, &yUpper);
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const zValue: Vec3f = @floatFromInt(zComponent*zMap[1]);
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if(neighbor == .dirNegX or neighbor == .dirPosY) {
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face.min[0] = 1 - face.min[0];
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face.max[0] = 1 - face.max[0];
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const swap = face.min[0];
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face.min[0] = face.max[0];
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face.max[0] = swap;
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}
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if(neighbor == .dirUp) {
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face.min = Vec2f{1, 1} - face.min;
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face.max = Vec2f{1, 1} - face.max;
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std.mem.swap(Vec2f, &face.min, &face.max);
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}
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if(neighbor == .dirDown) {
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face.min[1] = 1 - face.min[1];
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face.max[1] = 1 - face.max[1];
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const swap = face.min[1];
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face.min[1] = face.max[1];
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face.max[1] = swap;
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}
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quads.append(.{
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.normal = zAxis,
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.corners = .{
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xLower + yLower + zValue,
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xLower + yUpper + zValue,
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xUpper + yLower + zValue,
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xUpper + yUpper + zValue,
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},
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.cornerUV = .{.{face.min[0], face.min[1]}, .{face.min[0], face.max[1]}, .{face.max[0], face.min[1]}, .{face.max[0], face.max[1]}},
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.textureSlot = neighbor.toInt(),
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});
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}
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const middleFaces = mergeFaces(visibleMiddle, &faces);
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for(middleFaces) |*face| {
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var xLower = @abs(xAxis)*@as(Vec3f, @splat(face.min[0]));
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var xUpper = @abs(xAxis)*@as(Vec3f, @splat(face.max[0]));
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if(@reduce(.Add, xAxis) < 0) std.mem.swap(Vec3f, &xLower, &xUpper);
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var yLower = @abs(yAxis)*@as(Vec3f, @splat(face.min[1]));
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var yUpper = @abs(yAxis)*@as(Vec3f, @splat(face.max[1]));
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if(@reduce(.Add, yAxis) < 0) std.mem.swap(Vec3f, &yLower, &yUpper);
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const zValue = @as(Vec3f, @floatFromInt(zComponent))*@as(Vec3f, @splat(0.5));
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if(neighbor == .dirNegX or neighbor == .dirPosY) {
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face.min[0] = 1 - face.min[0];
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face.max[0] = 1 - face.max[0];
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const swap = face.min[0];
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face.min[0] = face.max[0];
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face.max[0] = swap;
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}
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if(neighbor == .dirUp) {
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face.min = Vec2f{1, 1} - face.min;
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face.max = Vec2f{1, 1} - face.max;
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std.mem.swap(Vec2f, &face.min, &face.max);
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}
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if(neighbor == .dirDown) {
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face.min[1] = 1 - face.min[1];
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face.max[1] = 1 - face.max[1];
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const swap = face.min[1];
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face.min[1] = face.max[1];
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face.max[1] = swap;
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}
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quads.append(.{
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.normal = zAxis,
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.corners = .{
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xLower + yLower + zValue,
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xLower + yUpper + zValue,
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xUpper + yLower + zValue,
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xUpper + yUpper + zValue,
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},
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.cornerUV = .{.{face.min[0], face.min[1]}, .{face.min[0], face.max[1]}, .{face.max[0], face.min[1]}, .{face.max[0], face.max[1]}},
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.textureSlot = neighbor.toInt(),
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});
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}
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}
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const index = main.models.Model.init(quads.items);
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if(i == 0) {
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modelIndex = index;
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}
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}
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return modelIndex.?;
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}
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pub fn model(block: Block) ModelIndex {
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return blocks.meshes.modelIndexStart(block).add(block.data & 255);
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}
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pub fn generateData(_: *main.game.World, _: Vec3i, _: Vec3f, _: Vec3f, _: Vec3i, _: ?Neighbor, currentData: *Block, _: Block, blockPlacing: bool) bool {
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if(blockPlacing) {
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currentData.data = 0;
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return true;
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}
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return false;
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}
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fn closestRay(comptime typ: enum {bit, intersection}, block: Block, relativePlayerPos: Vec3f, playerDir: Vec3f) if(typ == .intersection) ?RayIntersectionResult else u16 {
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var result: ?RayIntersectionResult = null;
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var resultBit: u16 = 0;
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for([_]u16{1, 2, 4, 8, 16, 32, 64, 128}) |bit| {
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if(block.data & bit == 0) {
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const cornerModelIndex: ModelIndex = blocks.meshes.modelIndexStart(block).add(255 ^ bit);
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if(RotationMode.DefaultFunctions.rayModelIntersection(cornerModelIndex, relativePlayerPos, playerDir)) |intersection| {
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if(result == null or intersection.distance < result.?.distance) {
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result = intersection;
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resultBit = bit;
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}
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}
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}
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}
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if(typ == .bit) return resultBit;
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return result;
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}
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pub fn rayIntersection(block: Block, item: ?main.items.Item, relativePlayerPos: Vec3f, playerDir: Vec3f) ?RayIntersectionResult {
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if(item) |_item| {
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switch(_item) {
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.baseItem => |baseItem| {
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if(std.mem.eql(u8, baseItem.id(), "cubyz:chisel")) { // Select only one eighth of a block
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return closestRay(.intersection, block, relativePlayerPos, playerDir);
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}
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},
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else => {},
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}
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}
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return RotationMode.DefaultFunctions.rayIntersection(block, item, relativePlayerPos, playerDir);
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}
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pub fn onBlockBreaking(item: ?main.items.Item, relativePlayerPos: Vec3f, playerDir: Vec3f, currentData: *Block) void {
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if(item) |_item| {
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switch(_item) {
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.baseItem => |baseItem| {
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if(std.mem.eql(u8, baseItem.id(), "cubyz:chisel")) { // Break only one eigth of a block
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currentData.data |= closestRay(.bit, currentData.*, relativePlayerPos, playerDir);
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if(currentData.data == 255) currentData.* = .{.typ = 0, .data = 0};
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return;
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}
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},
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else => {},
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}
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}
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return RotationMode.DefaultFunctions.onBlockBreaking(item, relativePlayerPos, playerDir, currentData);
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}
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pub fn canBeChangedInto(oldBlock: Block, newBlock: Block, item: main.items.ItemStack, shouldDropSourceBlockOnSuccess: *bool) RotationMode.CanBeChangedInto {
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if(oldBlock.typ != newBlock.typ) return RotationMode.DefaultFunctions.canBeChangedInto(oldBlock, newBlock, item, shouldDropSourceBlockOnSuccess);
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if(oldBlock.data == newBlock.data) return .no;
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if(item.item != null and item.item.? == .baseItem and std.mem.eql(u8, item.item.?.baseItem.id(), "cubyz:chisel")) {
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return .yes; // TODO: Durability change, after making the chisel a proper tool.
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}
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return .no;
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}
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