shape_maker/assets/shaders/grid.wgsl

@group(1) @binding(0)
var<uniform> grid_width: f32;
@group(1) @binding(1)
var<uniform> grid_size: vec2<f32>;
@group(1) @binding(2)
var<uniform> visible: u32;
let grid_color: vec4<f32> = vec4<f32>(1.0, 1.0, 1.0, 0.3);
let x_color: vec4<f32> = vec4<f32>(1.0, 0.0, 0.0, 1.0);
let y_color :vec4<f32> = vec4<f32>(0.0, 1.0, 0.0, 1.0);


#import bevy_sprite::mesh2d_view_bindings
#import bevy_sprite::mesh2d_bindings

// NOTE: Bindings must come before functions that use them!
#import bevy_sprite::mesh2d_functions

struct Vertex {
    @location(0) position: vec3<f32>,
    @location(1) normal: vec3<f32>,
    @location(2) uv: vec2<f32>,
#ifdef VERTEX_TANGENTS
    @location(3) tangent: vec4<f32>,
#endif
#ifdef VERTEX_COLORS
    @location(4) color: vec4<f32>,
#endif
    @builtin(vertex_index) index: u32,
};

struct VertexOutput {
    @builtin(position) clip_position: vec4<f32>,
    #import bevy_sprite::mesh2d_vertex_output
}

@vertex
fn vertex(vertex: Vertex) -> VertexOutput {
    var out: VertexOutput;
    out.uv = vertex.uv;
    out.world_position = mesh2d_position_local_to_world(mesh.model, vec4<f32>(vertex.position, 1.0));
    out.clip_position = mesh2d_position_world_to_clip(out.world_position);
    var grid_plane = array<vec3<f32>, 4>(
        vec3<f32>(-1., -1., 1.),
        vec3<f32>(-1., 1., 1.),
        vec3<f32>(1., -1., 1.),
        vec3<f32>(1., 1., 1.)
    );
    out.clip_position = vec4<f32>(grid_plane[vertex.index].xyz, 1.0);

    out.world_normal = mesh2d_normal_local_to_world(vertex.normal);
#ifdef VERTEX_TANGENTS
    out.world_tangent = mesh2d_tangent_local_to_world(vertex.tangent);
#endif
#ifdef VERTEX_COLORS
    out.color = vertex.color;
#endif
    return out;
}

@fragment
fn fragment(
    @builtin(position) position: vec4<f32>,
    #import bevy_sprite::mesh2d_vertex_output
) -> @location(0) vec4<f32> {
    if abs(world_position.y) < grid_width && abs(world_position.x) < grid_width {
        return grid_color;
    }
    else if abs(world_position.y) < grid_width {
        return x_color;
    }
    else if abs(world_position.x) < grid_width {
        return y_color;
    }
    else if visible == u32(0) {
        return vec4<f32>(0.0, 0.0, 0.0, 0.0);
    }
    else if abs(world_position.x) % grid_size.x <= grid_width || abs(world_position.y) % grid_size.y <= grid_width {
        return grid_color;
    }
    else {
        return vec4<f32>(0.0, 0.0, 0.0, 0.0);
    }
}