fixes to uvs

wip on custom chunk shader

game/main/assets/shaders/world/chunk.wgsl

@@ -0,0 +1,56 @@
+#import bevy_pbr::{
+    forward_io::VertexOutput,
+    mesh_view_bindings::view,
+    pbr_types::{STANDARD_MATERIAL_FLAGS_DOUBLE_SIDED_BIT, PbrInput, pbr_input_new},
+    pbr_functions as fns,
+}
+#import bevy_core_pipeline::tonemapping::tone_mapping
+
+@group(2) @binding(0) var my_array_texture: texture_2d_array<f32>;
+@group(2) @binding(1) var my_array_texture_sampler: sampler;
+
+@fragment
+fn fragment(
+    @builtin(front_facing) is_front: bool,
+    mesh: VertexOutput,
+) -> @location(0) vec4<f32> {
+    let layer = i32(mesh.world_position.x) & 0x3;
+
+    // Prepare a 'processed' StandardMaterial by sampling all textures to resolve
+    // the material members
+    var pbr_input: PbrInput = pbr_input_new();
+
+    pbr_input.material.base_color = textureSample(my_array_texture, my_array_texture_sampler, mesh.uv, layer);
+#ifdef VERTEX_COLORS
+    pbr_input.material.base_color = pbr_input.material.base_color * mesh.color;
+#endif
+
+    let double_sided = (pbr_input.material.flags & STANDARD_MATERIAL_FLAGS_DOUBLE_SIDED_BIT) != 0u;
+
+    pbr_input.frag_coord = mesh.position;
+    pbr_input.world_position = mesh.world_position;
+    pbr_input.world_normal = fns::prepare_world_normal(
+        mesh.world_normal,
+        double_sided,
+        is_front,
+    );
+
+    pbr_input.is_orthographic = view.projection[3].w == 1.0;
+
+    pbr_input.N = fns::apply_normal_mapping(
+        pbr_input.material.flags,
+        mesh.world_normal,
+        double_sided,
+        is_front,
+#ifdef VERTEX_TANGENTS
+#ifdef STANDARD_MATERIAL_NORMAL_MAP
+        mesh.world_tangent,
+#endif
+#endif
+        mesh.uv,
+        view.mip_bias,
+    );
+    pbr_input.V = fns::calculate_view(mesh.world_position, pbr_input.is_orthographic);
+
+    return tone_mapping(fns::apply_pbr_lighting(pbr_input), view.color_grading);
+}