implement basic meshing
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catAngent
parent
af82bb5bd9
commit
5cf2933210
2 changed files with 228 additions and 46 deletions
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@ -1,17 +1,29 @@
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const std = @import("std");
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const rh = @import("../util/raylib_helper.zig");
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const raylib = rh.raylib;
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const v3 = rh.v3;
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const A7r = std.mem.Allocator;
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const RawQuad = struct {
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tile: i32,
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top_left: raylib.Vector3,
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top_right: raylib.Vector3,
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bottom_right: raylib.Vector3,
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bottom_left: raylib.Vector3,
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normal: raylib.Vector3,
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};
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pub const Chunk = struct {
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tiles: []i32,
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a7r: A7r,
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pub fn init(a7r: A7r) !Chunk {
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return Chunk{
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const self = Chunk{
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.a7r = a7r,
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.tiles = try a7r.alloc(i32, 32 * 32 * 32),
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};
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@memset(self.tiles, 0);
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return self;
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}
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pub fn deinit(self: Chunk) void {
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@ -26,41 +38,201 @@ pub const Chunk = struct {
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self.tiles[@as(u15, x) << 10 | @as(u15, y) << 5 | @as(u15, z)] = tile;
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}
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pub fn createMesh(_: Chunk) raylib.Mesh {
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const triangle_count: u32 = 1;
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pub fn createMesh(chunk: Chunk) !raylib.Mesh {
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var raw_quads = try std.ArrayList(RawQuad).initCapacity(chunk.a7r, 4096);
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defer raw_quads.deinit();
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for (0..32) |raw_x| {
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const x: u5 = @intCast(raw_x);
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var positive_tile_surfaces: [32][32]i32 = .{.{0} ** 32} ** 32;
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var negative_tile_surfaces: [32][32]i32 = .{.{0} ** 32} ** 32;
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for (0..32) |raw_y| for (0..32) |raw_z| {
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const y: u5 = @intCast(raw_y);
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const z: u5 = @intCast(raw_z);
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const tile: i32 = chunk.getTile(x, y, z);
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if (tile == 0) continue;
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if (x == 31 or chunk.getTile(x + 1, y, z) == 0) positive_tile_surfaces[y][z] = tile;
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if (x == 0 or chunk.getTile(x - 1, y, z) == 0) negative_tile_surfaces[y][z] = tile;
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};
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const xf: f32 = @floatFromInt(raw_x);
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for (0..32) |y| for (0..32) |z| {
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const surface = positive_tile_surfaces[y][z];
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if (surface == 0) continue;
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positive_tile_surfaces[y][z] = 0;
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const yf: f32 = @floatFromInt(y);
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const zf: f32 = @floatFromInt(z);
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const raw_quad: RawQuad = .{
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.tile = surface,
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.top_left = v3.new(xf + 0.5, yf - 0.5, zf - 0.5),
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.top_right = v3.new(xf + 0.5, yf + 0.5, zf - 0.5),
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.bottom_left = v3.new(xf + 0.5, yf - 0.5, zf + 0.5),
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.bottom_right = v3.new(xf + 0.5, yf + 0.5, zf + 0.5),
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.normal = v3.new(1, 0, 0),
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};
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try raw_quads.append(raw_quad);
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};
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for (0..32) |y| for (0..32) |z| {
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const surface = negative_tile_surfaces[y][z];
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if (surface == 0) continue;
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negative_tile_surfaces[y][z] = 0;
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const yf: f32 = @floatFromInt(y);
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const zf: f32 = @floatFromInt(z);
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const raw_quad: RawQuad = .{
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.tile = surface,
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.top_left = v3.new(xf - 0.5, yf + 0.5, zf - 0.5),
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.top_right = v3.new(xf - 0.5, yf - 0.5, zf - 0.5),
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.bottom_left = v3.new(xf - 0.5, yf + 0.5, zf + 0.5),
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.bottom_right = v3.new(xf - 0.5, yf - 0.5, zf + 0.5),
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.normal = v3.new(-1, 0, 0),
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};
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try raw_quads.append(raw_quad);
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};
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}
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const arr_size: c_uint = triangle_count * 3 * @sizeOf(f32);
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for (0..32) |raw_z| {
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const z: u5 = @intCast(raw_z);
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var positive_tile_surfaces: [32][32]i32 = .{.{0} ** 32} ** 32;
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var negative_tile_surfaces: [32][32]i32 = .{.{0} ** 32} ** 32;
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for (0..32) |raw_y| for (0..32) |raw_x| {
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const y: u5 = @intCast(raw_y);
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const x: u5 = @intCast(raw_x);
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const tile: i32 = chunk.getTile(x, y, z);
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if (tile == 0) continue;
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if (z == 31 or chunk.getTile(x, y, z + 1) == 0) positive_tile_surfaces[y][x] = tile;
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if (z == 0 or chunk.getTile(x, y, z - 1) == 0) negative_tile_surfaces[y][x] = tile;
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};
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const zf: f32 = @floatFromInt(raw_z);
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for (0..32) |y| for (0..32) |x| {
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const surface = positive_tile_surfaces[y][x];
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if (surface == 0) continue;
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positive_tile_surfaces[y][x] = 0;
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const yf: f32 = @floatFromInt(y);
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const xf: f32 = @floatFromInt(x);
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const raw_quad: RawQuad = .{
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.tile = surface,
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.top_left = v3.new(xf - 0.5, yf - 0.5, zf + 0.5),
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.top_right = v3.new(xf + 0.5, yf - 0.5, zf + 0.5),
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.bottom_left = v3.new(xf - 0.5, yf + 0.5, zf + 0.5),
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.bottom_right = v3.new(xf + 0.5, yf + 0.5, zf + 0.5),
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.normal = v3.new(0, 0, 1),
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};
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try raw_quads.append(raw_quad);
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};
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for (0..32) |y| for (0..32) |x| {
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const surface = negative_tile_surfaces[y][x];
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if (surface == 0) continue;
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negative_tile_surfaces[y][x] = 0;
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const yf: f32 = @floatFromInt(y);
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const xf: f32 = @floatFromInt(x);
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const raw_quad: RawQuad = .{
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.tile = surface,
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.top_left = v3.new(xf - 0.5, yf + 0.5, zf - 0.5),
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.top_right = v3.new(xf + 0.5, yf + 0.5, zf - 0.5),
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.bottom_left = v3.new(xf - 0.5, yf - 0.5, zf - 0.5),
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.bottom_right = v3.new(xf + 0.5, yf - 0.5, zf - 0.5),
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.normal = v3.new(0, 0, -1),
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};
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try raw_quads.append(raw_quad);
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};
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}
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for (0..32) |raw_y| {
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const y: u5 = @intCast(raw_y);
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var positive_tile_surfaces: [32][32]i32 = .{.{0} ** 32} ** 32;
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var negative_tile_surfaces: [32][32]i32 = .{.{0} ** 32} ** 32;
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for (0..32) |raw_x| for (0..32) |raw_z| {
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const x: u5 = @intCast(raw_x);
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const z: u5 = @intCast(raw_z);
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const tile: i32 = chunk.getTile(x, y, z);
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if (tile == 0) continue;
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if (y == 31 or chunk.getTile(x, y + 1, z) == 0) positive_tile_surfaces[x][z] = tile;
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if (y == 0 or chunk.getTile(x, y - 1, z) == 0) negative_tile_surfaces[x][z] = tile;
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};
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const yf: f32 = @floatFromInt(raw_y);
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for (0..32) |x| for (0..32) |z| {
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const surface = positive_tile_surfaces[x][z];
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if (surface == 0) continue;
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positive_tile_surfaces[x][z] = 0;
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const xf: f32 = @floatFromInt(x);
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const zf: f32 = @floatFromInt(z);
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const raw_quad: RawQuad = .{
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.tile = surface,
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.top_left = v3.new(xf - 0.5, yf + 0.5, zf - 0.5),
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.top_right = v3.new(xf - 0.5, yf + 0.5, zf + 0.5),
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.bottom_left = v3.new(xf + 0.5, yf + 0.5, zf - 0.5),
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.bottom_right = v3.new(xf + 0.5, yf + 0.5, zf + 0.5),
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.normal = v3.new(0, 1, 0),
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};
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try raw_quads.append(raw_quad);
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};
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for (0..32) |x| for (0..32) |z| {
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const surface = negative_tile_surfaces[x][z];
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if (surface == 0) continue;
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negative_tile_surfaces[x][z] = 0;
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const xf: f32 = @floatFromInt(x);
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const zf: f32 = @floatFromInt(z);
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const raw_quad: RawQuad = .{
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.tile = surface,
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.top_left = v3.new(xf + 0.5, yf - 0.5, zf - 0.5),
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.top_right = v3.new(xf + 0.5, yf - 0.5, zf + 0.5),
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.bottom_left = v3.new(xf - 0.5, yf - 0.5, zf - 0.5),
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.bottom_right = v3.new(xf - 0.5, yf - 0.5, zf + 0.5),
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.normal = v3.new(0, -1, 0),
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};
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try raw_quads.append(raw_quad);
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};
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}
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const triangle_count: c_int = @intCast(raw_quads.items.len * 2);
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const arr_size: c_uint = @as(c_uint, @intCast(triangle_count)) * 3 * @sizeOf(f32);
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const vertices: [*]f32 = @ptrCast(@alignCast(raylib.MemAlloc(arr_size * 3)));
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const texcoords: [*]f32 = @ptrCast(@alignCast(raylib.MemAlloc(arr_size * 2)));
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const normals: [*]f32 = @ptrCast(@alignCast(raylib.MemAlloc(arr_size * 3)));
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vertices[0] = 0.0;
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vertices[1] = 0.0;
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vertices[2] = 0.0;
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normals[0] = 0.0;
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normals[1] = 1.0;
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normals[2] = 0.0;
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texcoords[0] = 0.0;
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texcoords[1] = 0.0;
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for (raw_quads.items, 0..) |raw_quad, i| {
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for (0..6) |j| {
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normals[18 * i + 3 * j + 0] = raw_quad.normal.x;
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normals[18 * i + 3 * j + 1] = raw_quad.normal.y;
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normals[18 * i + 3 * j + 2] = raw_quad.normal.z;
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}
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vertices[3] = 1.0;
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vertices[4] = 0.0;
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vertices[5] = 2.0;
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normals[3] = 0.0;
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normals[4] = 1.0;
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normals[5] = 0.0;
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texcoords[2] = 0.5;
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texcoords[3] = 1.0;
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vertices[18 * i + 0] = raw_quad.top_left.x;
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vertices[18 * i + 1] = raw_quad.top_left.y;
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vertices[18 * i + 2] = raw_quad.top_left.z;
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texcoords[12 * i + 0] = 0.0;
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texcoords[12 * i + 1] = 0.0;
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vertices[6] = 2.0;
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vertices[7] = 0.0;
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vertices[8] = 0.0;
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normals[6] = 0.0;
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normals[7] = 1.0;
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normals[8] = 0.0;
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texcoords[4] = 1.0;
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texcoords[5] = 0.0;
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vertices[18 * i + 3] = raw_quad.top_right.x;
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vertices[18 * i + 4] = raw_quad.top_right.y;
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vertices[18 * i + 5] = raw_quad.top_right.z;
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texcoords[12 * i + 2] = 1.0;
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texcoords[12 * i + 3] = 0.0;
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vertices[18 * i + 6] = raw_quad.bottom_left.x;
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vertices[18 * i + 7] = raw_quad.bottom_left.y;
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vertices[18 * i + 8] = raw_quad.bottom_left.z;
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texcoords[12 * i + 4] = 0.0;
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texcoords[12 * i + 5] = 1.0;
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vertices[18 * i + 9] = raw_quad.bottom_right.x;
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vertices[18 * i + 10] = raw_quad.bottom_right.y;
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vertices[18 * i + 11] = raw_quad.bottom_right.z;
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texcoords[12 * i + 6] = 1.0;
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texcoords[12 * i + 7] = 1.0;
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vertices[18 * i + 12] = raw_quad.bottom_left.x;
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vertices[18 * i + 13] = raw_quad.bottom_left.y;
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vertices[18 * i + 14] = raw_quad.bottom_left.z;
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texcoords[12 * i + 8] = 0.0;
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texcoords[12 * i + 9] = 1.0;
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vertices[18 * i + 15] = raw_quad.top_right.x;
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vertices[18 * i + 16] = raw_quad.top_right.y;
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vertices[18 * i + 17] = raw_quad.top_right.z;
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texcoords[12 * i + 10] = 1.0;
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texcoords[12 * i + 11] = 0.0;
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}
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var mesh = raylib.Mesh{
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.triangleCount = triangle_count,
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