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// wearechat - generic multiplayer game with voip
// Copyright (C) 2025 metamuffin
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, version 3 of the License only.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
struct VertexIn {
@location(0) position: vec3<f32>,
@location(1) normal: vec3<f32>,
@location(2) tangent: vec4<f32>, // TODO maybe compress this
@location(3) texcoord: vec2<f32>,
@location(4) joint_index: vec4<u32>,
@location(5) joint_weight: vec4<f32>,
}
struct VertexOut {
@builtin(position) clip: vec4<f32>,
@location(0) normal: vec3<f32>,
@location(1) tangent: vec3<f32>,
@location(2) tangent_binormal_sign: f32,
@location(3) texcoord: vec2<f32>,
@location(4) position: vec3<f32>,
}
struct PushConst {
modelviewproject: mat4x4<f32>,
model: mat4x4<f32>,
}
@group(3) @binding(0) var<uniform> joints: array<mat4x4<f32>, 128>;
var<push_constant> pc: PushConst;
@vertex
fn main(vi: VertexIn) -> VertexOut {
let pos_in = vec4(vi.position, 1.);
let j0 = vi.joint_weight.x * (joints[vi.joint_index.x] * pos_in);
let j1 = vi.joint_weight.y * (joints[vi.joint_index.y] * pos_in);
let j2 = vi.joint_weight.z * (joints[vi.joint_index.z] * pos_in);
let j3 = vi.joint_weight.w * (joints[vi.joint_index.w] * pos_in);
let position = j0 + j1 + j2 + j3;
let clip = pc.modelviewproject * position;
let vo = VertexOut(
clip,
normalize((pc.model * vec4(vi.normal, 0.)).xyz),
normalize((pc.model * vec4(vi.tangent.xyz, 0.)).xyz),
vi.tangent.w,
vi.texcoord,
(pc.model * vec4(vi.position, 1.)).xyz,
);
return vo;
}
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