const std = @import("std");
const log = std.log.scoped(.graphics);
const vk = @import("vulkan");

const device = @import("device.zig");

pub const RenderPassContext = struct {
    render_pass: vk.RenderPass,

    pub fn destroy(self: *const RenderPassContext, ldc: *const device.LogicalDeviceContext) void {
        ldc.vkd.destroyRenderPass(ldc.device, self.render_pass, null);
    }
};

pub fn initRenderPass(ldc: device.LogicalDeviceContext, format: vk.Format) !RenderPassContext {
    const color_attachment = vk.AttachmentDescription{
        .format = format,
        .samples = .{ .@"1_bit" = true },
        .load_op = .clear,
        .store_op = .store,
        .stencil_load_op = .dont_care,
        .stencil_store_op = .dont_care,
        .initial_layout = .undefined,
        .final_layout = .present_src_khr,
    };

    const color_attachment_ref = vk.AttachmentReference{
        .attachment = 0,
        .layout = .color_attachment_optimal,
    };

    const subpass = vk.SubpassDescription{
        .pipeline_bind_point = .graphics,
        .color_attachment_count = 1,
        .p_color_attachments = @ptrCast(&color_attachment_ref),
    };

    const subpass_dependency = vk.SubpassDependency{
        .src_subpass = vk.SUBPASS_EXTERNAL,
        .dst_subpass = 0,
        .src_stage_mask = .{
            .color_attachment_output_bit = true,
        },
        .src_access_mask = .{},
        .dst_stage_mask = .{
            .color_attachment_output_bit = true,
        },
        .dst_access_mask = .{
            .color_attachment_write_bit = true,
        },
    };

    const render_pass_create_info = vk.RenderPassCreateInfo{
        .attachment_count = 1,
        .p_attachments = @ptrCast(&color_attachment),
        .subpass_count = 1,
        .p_subpasses = @ptrCast(&subpass),
        .dependency_count = 1,
        .p_dependencies = @ptrCast(&subpass_dependency),
    };

    const render_pass = try ldc.vkd.createRenderPass(ldc.device, &render_pass_create_info, null);
    log.debug("created render pass", .{});

    return .{ .render_pass = render_pass };
}