feat(render): add scene environment pipeline

src/shaders/shadow.wgsl

@@ -0,0 +1,79 @@
+struct Uniforms {
+    viewport_size: vec2<f32>,
+    world_per_pixel: f32,
+    lwdisplay_enable: f32,
+    flat_shade: f32,
+    transparency_enable: f32,
+    linetype_scale: f32,
+    _pad: f32,
+    view_rot: mat4x4<f32>,
+    eye_high: vec3<f32>,
+    _pad_eh: f32,
+    eye_low: vec3<f32>,
+    _pad_el: f32,
+    light_position_type: array<vec4<f32>, 4>,
+    light_direction_intensity: array<vec4<f32>, 4>,
+    light_color_hotspot: array<vec4<f32>, 4>,
+    light_attenuation: array<vec4<f32>, 4>,
+    lighting: vec4<f32>,
+    visual_style: vec4<f32>,
+    visual_style_color: vec4<f32>,
+    viewport_background: vec4<f32>,
+    view_tone: vec4<f32>,
+    background_top: vec4<f32>,
+    background_middle: vec4<f32>,
+    background_bottom: vec4<f32>,
+    background_aux0: vec4<f32>,
+    background_aux1: vec4<f32>,
+    background_params: vec4<f32>,
+    background_image_params: vec4<f32>,
+    background_image_transform: vec4<f32>,
+    environment_params: vec4<f32>,
+    environment_view: mat4x4<f32>,
+    shadow_view_proj: mat4x4<f32>,
+    shadow_params: vec4<f32>,
+    fog_color: vec4<f32>,
+    fog_params: vec4<f32>,
+    fog_distances: vec4<f32>,
+    light_web_profile_a: array<vec4<f32>, 4>,
+    light_web_profile_b: array<vec4<f32>, 4>,
+    light_web_rotation: array<vec4<f32>, 4>,
+};
+
+struct MeshInstance {
+    model_row_0: vec4<f32>,
+    model_row_1: vec4<f32>,
+    model_row_2: vec4<f32>,
+    translation_low: vec4<f32>,
+    normal_row_0: vec4<f32>,
+    normal_row_1: vec4<f32>,
+    normal_row_2: vec4<f32>,
+};
+
+@group(0) @binding(0) var<uniform> u: Uniforms;
+@group(1) @binding(15) var<storage, read> mesh_instances: array<MeshInstance>;
+
+struct VertexIn {
+    @location(0) position: vec3<f32>,
+    @location(3) position_low: vec3<f32>,
+};
+
+@vertex
+fn vs_main(
+    vertex: VertexIn,
+    @builtin(instance_index) instance_index: u32,
+) -> @builtin(position) vec4<f32> {
+    let instance = mesh_instances[instance_index];
+    let world_high = vec3<f32>(
+        dot(instance.model_row_0.xyz, vertex.position) + instance.model_row_0.w,
+        dot(instance.model_row_1.xyz, vertex.position) + instance.model_row_1.w,
+        dot(instance.model_row_2.xyz, vertex.position) + instance.model_row_2.w,
+    );
+    let world_low = vec3<f32>(
+        dot(instance.model_row_0.xyz, vertex.position_low),
+        dot(instance.model_row_1.xyz, vertex.position_low),
+        dot(instance.model_row_2.xyz, vertex.position_low),
+    ) + instance.translation_low.xyz;
+    let relative = (world_high - u.eye_high) + (world_low - u.eye_low);
+    return u.shadow_view_proj * vec4<f32>(relative, 1.0);
+}