embrace the egui

assets/shaders/shader.wgsl

@@ -0,0 +1,24 @@
+#import bevy_pbr::forward_io::{VertexOutput, FragmentOutput}
+
+@group(#{MATERIAL_BIND_GROUP}) @binding(101) var ui_texture: texture_2d<f32>;
+@group(#{MATERIAL_BIND_GROUP}) @binding(102) var ui_texture_sampler: sampler;
+@group(#{MATERIAL_BIND_GROUP}) @binding(103) var cursor_texture: texture_2d<f32>;
+@group(#{MATERIAL_BIND_GROUP}) @binding(104) var cursor_texture_sampler: sampler;
+
+@fragment
+fn fragment(
+    in: VertexOutput,
+) -> FragmentOutput {
+    var out: FragmentOutput;
+
+    // textureSample(material_color_texture, material_color_sampler, in.uv);
+
+    var surface = textureSample(ui_texture, ui_texture_sampler, in.uv);
+    var overlay = textureSample(cursor_texture, cursor_texture_sampler, in.uv);
+
+    var result_rgb = mix(surface.rgb, overlay.rgb, overlay.a);
+
+    out.color = vec4(result_rgb, 1.0);
+
+    return out;
+}