Use named binding constant

src/ShaderManager.zig

@@ -29,7 +29,7 @@ pub fn init(gc: *GraphicsContext) !ShaderManager {
         const descriptor_set_layout_bindings = [_]vk.DescriptorSetLayoutBinding{
             vk.DescriptorSetLayoutBinding{
                 .descriptor_type = .uniform_buffer,
-                .binding = 0,
+                .binding = DescriptorSets.Global.UBO.GlobalUniform,
                 .descriptor_count = 1,
                 .stage_flags = vk.ShaderStageFlags.fromInt(0x7FFFFFFF), // SHADER_STAGE_ALL
             },