From 58e3531cd2316e9c73b01221d68834592ad6a2ff Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Tue, 28 Jan 2025 15:25:50 +0100
Subject: Little endian, tangent space handedness,

---
 client/src/render/shaders/fragment_pbr.wgsl | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'client/src/render/shaders/fragment_pbr.wgsl')

diff --git a/client/src/render/shaders/fragment_pbr.wgsl b/client/src/render/shaders/fragment_pbr.wgsl
index c8fb857..80d3802 100644
--- a/client/src/render/shaders/fragment_pbr.wgsl
+++ b/client/src/render/shaders/fragment_pbr.wgsl
@@ -17,8 +17,9 @@ struct VertexOut {
     @builtin(position) clip: vec4<f32>,
     @location(0) normal: vec3<f32>,
     @location(1) tangent: vec3<f32>,
-    @location(2) texcoord: vec2<f32>,
-    @location(3) position: vec3<f32>,
+    @location(2) tangent_binormal_sign: f32,
+    @location(3) texcoord: vec2<f32>,
+    @location(4) position: vec3<f32>,
 }
 
 struct Material {
@@ -39,7 +40,7 @@ fn main(vo: VertexOut) -> @location(0) vec4<f32> {
     let t_albedo = textureSample(tex_albedo, tex_albedo_sampler, vo.texcoord);
     let t_normal = textureSample(tex_normal, tex_normal_sampler, vo.texcoord);
 
-    let tangent_basis = mat3x3(vo.tangent, cross(vo.tangent, vo.normal), vo.normal);
+    let tangent_basis = mat3x3(vo.tangent, vo.tangent_binormal_sign * cross(vo.tangent, vo.normal), vo.normal);
     let normal = tangent_basis * (t_normal.rgb * 2. - 1.);
 
     let light = vec3(0.64, 0.64, 0.64);
-- 
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