/*
 * Tuxánci 2 - A first person shooter
 * Copyright (C) 2007-2011  Tuxánci Development Team
 * Copyright (C) 2025-2026  Connor Thomson
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

struct ObjUniforms {
    float4x4 mvp;
    float4x4 model;
    float3   camera_position;
    float    padding;
};

[[vk::binding(0, 1)]]
ConstantBuffer<ObjUniforms> uniforms : register(b0, space1);

struct VSInput {
    float3 position : POSITION0;
    float3 normal : NORMAL0;
};

struct VSOutput {
    float4 position        : SV_Position;
    float3 normal          : TEXCOORD0;
    float3 world_position  : TEXCOORD1;
    float3 camera_position : TEXCOORD2;
};

VSOutput main(VSInput input) {
    VSOutput output;
    float4 world_position  = mul(uniforms.model, float4(input.position, 1.0));
    output.position        = mul(uniforms.mvp, float4(input.position, 1.0));
    output.normal          = normalize(mul((float3x3)uniforms.model, input.normal));
    output.world_position  = world_position.xyz;
    output.camera_position = uniforms.camera_position;
    return output;
}