Add textured OBJ model rendering

static/wgsl/shader.wgsl

@@ -8,6 +8,12 @@ struct MatrixUniform {
 @group(0) @binding(0)
 var<uniform> u: MatrixUniform;
 
+@group(1) @binding(0)
+var model_texture: texture_2d<f32>;
+
+@group(1) @binding(1)
+var model_sampler: sampler;
+
 fn saturate(value: f32) -> f32 {
     return clamp(value, 0.0, 1.0);
 }
@@ -305,4 +311,48 @@ fn fs_dot(in: DotVertexOutput) -> @location(0) vec4f {
     let alpha = max(core, glow);
 
     return vec4f(color, alpha);
-}
+}
+
+
+// model
+struct ModelVertexInput {
+    @location(0) position: vec3f,
+    @location(1) tex_coords: vec2f,
+    @location(2) normal: vec3f,
+    @location(5) model_0: vec4f,
+    @location(6) model_1: vec4f,
+    @location(7) model_2: vec4f,
+    @location(8) model_3: vec4f,
+}
+
+struct ModelVertexOutput {
+    @builtin(position) clip_position: vec4f,
+    @location(0) world_normal: vec3f,
+    @location(1) world_position: vec3f,
+    @location(2) tex_coords: vec2f,
+}
+
+@vertex
+fn vs_model(vertex: ModelVertexInput) -> ModelVertexOutput {
+    let model = mat4x4f(vertex.model_0, vertex.model_1, vertex.model_2, vertex.model_3);
+    let world_position = model * vec4f(vertex.position, 1.0);
+    let normal_matrix = mat3x3f(model[0].xyz, model[1].xyz, model[2].xyz);
+
+    var out: ModelVertexOutput;
+    out.clip_position = u.view_proj * world_position;
+    out.world_position = world_position.xyz;
+    out.world_normal = normalize(normal_matrix * vertex.normal);
+    out.tex_coords = vec2f(vertex.tex_coords.x, 1.0 - vertex.tex_coords.y);
+    return out;
+}
+
+@fragment
+fn fs_model(in: ModelVertexOutput) -> @location(0) vec4f {
+    let light_dir = normalize(vec3f(-0.35, 0.85, 0.45));
+    let normal = normalize(in.world_normal);
+    let diffuse = max(dot(normal, light_dir), 0.0);
+    let rim = pow(1.0 - saturate(abs(normal.y)), 2.0) * 0.16;
+    let base = textureSample(model_texture, model_sampler, in.tex_coords).rgb;
+    let color = base * (0.28 + diffuse * 0.72) + vec3f(0.14, 0.24, 0.32) * rim;
+    return vec4f(color, 1.0);
+}