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/*
* Tuxánci 2 - A first person shooter
* 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 model_uniforms {
float4x4 mvp;
float4x4 model;
float4x4 light_view_projection;
float3 camera_position;
float shadow_normal_offset;
};
[[vk::binding(0, 1)]]
ConstantBuffer<model_uniforms> 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;
float4 light_space_position : TEXCOORD3;
};
VSOutput main(VSInput input) {
VSOutput output;
float4 world_position = mul(uniforms.model, float4(input.position, 1.0));
float3 world_normal = normalize(mul((float3x3)uniforms.model, input.normal));
output.position = mul(uniforms.mvp, float4(input.position, 1.0));
output.normal = world_normal;
output.world_position = world_position.xyz;
output.camera_position = uniforms.camera_position;
float3 offset_position = world_position.xyz + world_normal * uniforms.shadow_normal_offset;
output.light_space_position = mul(uniforms.light_view_projection, float4(offset_position, 1.0));
return output;
}
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