//    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) pos: vec2<f32>,
    @location(1) uv: vec2<f32>,
    @location(2) color: u32,
}
struct VertexOut {
    @builtin(position) clip: vec4<f32>,
    @location(0) uv: vec2<f32>,
    @location(1) color: vec4<f32>,
}

var<push_constant> project: mat4x4<f32>;

fn unpack_color(color: u32) -> vec4<f32> {
    return vec4<f32>(
        f32(color & 255u),
        f32((color >> 8u) & 255u),
        f32((color >> 16u) & 255u),
        f32((color >> 24u) & 255u),
    ) / 255.0;
}

@vertex
fn main(@builtin(vertex_index) vindex: u32, vi: VertexIn) -> VertexOut {
    var clip = project * vec4(vi.pos, 0., 1.);
    let vo = VertexOut(clip, vi.uv, unpack_color(vi.color));
    return vo;
}