1 files changed, 55 insertions, 0 deletions
diff --git a/client/src/shaders/fragment_pbr.wgsl b/client/src/shaders/fragment_pbr.wgsl
new file mode 100644
index 0000000..ac2638d
--- /dev/null
+++ b/client/src/shaders/fragment_pbr.wgsl
@@ -0,0 +1,55 @@
+//    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 VertexOut {
+    @builtin(position) clip: vec4<f32>,
+    @location(0) normal: vec3<f32>,
+    @location(1) tangent: vec3<f32>,
+    @location(2) texcoord: vec2<f32>,
+}
+
+struct Material {
+    roughness: f32,
+    metallic: f32,
+    albedo_alpha: vec4<f32>,
+    emission: vec3<f32>,
+}
+
+@group(0) @binding(0) var tex_albedo: texture_2d<f32>;
+@group(0) @binding(1) var tex_albedo_sampler: sampler;
+@group(1) @binding(0) var tex_normal: texture_2d<f32>;
+@group(1) @binding(1) var tex_normal_sampler: sampler;
+@group(2) @binding(0) var<uniform> material: Material;
+
+const LIGHT: vec3<f32> = vec3(0.64, 0.64, 0.64);
+
+@fragment
+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 normal = tangent_basis * (t_normal.rgb * 2. - 1.);
+
+    let alpha = t_albedo.a;
+    let lighting = mix(1., saturate(dot(LIGHT, normal)), 1.);
+
+    let color = t_albedo.rgb * lighting;
+
+    if fract(dot(sin(vo.clip * 123.) * 1213., vec4(3., 2., 1., 4.))) > alpha {
+        discard;
+    }
+    return vec4(color, 1.);
+}