const std = @import("std");
const vk = @import("vk");
const GraphicsContext = @import("GraphicsContext.zig");

pub const ShaderManager = @This();

pub const DescriptorSets = struct {
    const Global = struct {
        pub const UBO = enum(u32) {
            GlobalUniform = 0,
        };
    };
};

pub const DescriptorSetLayouts = struct {
    global: vk.DescriptorSetLayout = .null_handle,
};

gc: *GraphicsContext,
descriptor_set_layouts: DescriptorSetLayouts = .{},

pub fn init(gc: *GraphicsContext) !ShaderManager {
    var self = ShaderManager{
        .gc = gc,
    };

    // Global Descriptor Set Layout
    {
        const descriptor_set_layout_bindings = [_]vk.DescriptorSetLayoutBinding{
            vk.DescriptorSetLayoutBinding{
                .descriptor_type = .uniform_buffer,
                .binding = DescriptorSets.Global.UBO.GlobalUniform,
                .descriptor_count = 1,
                .stage_flags = vk.ShaderStageFlags.fromInt(0x7FFFFFFF), // SHADER_STAGE_ALL
            },
        };
        self.descriptor_set_layouts.global = try self.gc.device.createDescriptorSetLayout(&.{
            .p_bindings = &descriptor_set_layout_bindings,
            .binding_count = descriptor_set_layout_bindings.len,
        }, null);
    }

    return self;
}