improving readme

README.md

@@ -1,9 +1,32 @@
-# Stroll Vulkan Driver
+# Stroll Vulkan ICD
 
 <img align="right" src="https://matthew.kerwin.net.au/blog_files/kappa"/>
 
 A driver as slow as Lance Stroll.
 
-Here is the source code of a disastrous implementation of the Vulkan specification as an Installable Client Driver (ICD) in a software graphics driver written in Zig.
+Here lies the source code of a rather calamitous attempt at the Vulkan specification, shaped into an Installable Client Driver for a software-based renderer, all written in Zig.
 
-It exists solely for my own educational purposes and should not be taken seriously or be used in any *real* project.
+It was forged for my own learning and amusement alone. Pray, do not wield it in any earnest project, lest thy hopes and frame rates both find themselves entombed.
+
+## Purpose
+
+To understand Vulkan — not as a humble API mere mortals call upon, but as a labyrinthine system where one may craft a driver by hand.
+It does not seek to produce a performant or production-worthy driver. \
+*The gods are merciful, but not that merciful.*
+
+# Build
+
+If thou art truly determined:
+```
+zig build
+```
+
+Then ensure thy Vulkan loader is pointed toward the ICD manifest.
+The precise ritual varies by system — consult the tomes of your operating system, or wander the web’s endless mausoleum of documentation.
+
+Use at your own risk. If thy machine shudders, weeps, or attempts to flee — know that it was warned.
+
+# License
+
+Released unto the world as MIT for study, experimentation, and the occasional horrified whisper.
+Do with it as thou wilt, but accept the consequences as thine own.

src/soft/PhysicalDevice.zig

@@ -48,7 +48,7 @@ pub fn create(allocator: std.mem.Allocator, instance: *const base.Instance) VkEr
     defer info.deinit(allocator);
 
     var writer = std.Io.Writer.fixed(interface.props.device_name[0 .. vk.MAX_PHYSICAL_DEVICE_NAME_SIZE - 1]);
-    writer.print("{s} [Soft Vulkan Driver]", .{info.name}) catch return VkError.InitializationFailed;
+    writer.print("{s} [" ++ root.DRIVER_NAME ++ " StrollDriver]", .{info.name}) catch return VkError.InitializationFailed;
 
     self.* = .{
         .interface = interface,

src/soft/lib.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const vk = @import("vulkan");
-const base = @import("base");
+pub const base = @import("base");
 
 pub const Instance = @import("Instance.zig");
 const Device = @import("Device.zig");

src/vulkan/lib.zig

@@ -11,10 +11,9 @@ pub const Instance = @import("Instance.zig");
 pub const Device = @import("Device.zig");
 pub const PhysicalDevice = @import("PhysicalDevice.zig");
 pub const VulkanAllocator = @import("VulkanAllocator.zig");
-//pub const Device = @import("Device.zig");
 
 pub const VULKAN_VENDOR_ID = @typeInfo(vk.VendorId).@"enum".fields[@typeInfo(vk.VendorId).@"enum".fields.len - 1].value + 1;
-pub const DRIVER_LOGS_ENV_NAME = "DRIVER_LOGS";
+pub const DRIVER_LOGS_ENV_NAME = "STROLL_LOGS";
 
 pub const std_options: std.Options = .{
     .log_level = .debug,

src/vulkan/lib_vulkan.zig

@@ -16,19 +16,16 @@ const Device = @import("Device.zig");
 const PhysicalDevice = @import("PhysicalDevice.zig");
 
 // This file contains all exported Vulkan entrypoints.
-//
-// The use of official Vulkan function names is assumed
-// and is not a concern, given that this driver only implements Vulkan's API.
 
 fn functionMapElement(comptime name: []const u8) struct { []const u8, vk.PfnVoidFunction } {
     const stroll_name = std.fmt.comptimePrint("stroll{s}", .{name[2..]});
 
-    if (std.meta.hasFn(@This(), name)) {
-        return .{ name, @as(vk.PfnVoidFunction, @ptrCast(&@field(@This(), name))) };
-    } else if (std.meta.hasFn(@This(), stroll_name)) {
-        return .{ name, @as(vk.PfnVoidFunction, @ptrCast(&@field(@This(), stroll_name))) };
-    }
-    return .{ name, null };
+    return if (std.meta.hasFn(@This(), name))
+        .{ name, @as(vk.PfnVoidFunction, @ptrCast(&@field(@This(), name))) }
+    else if (std.meta.hasFn(@This(), stroll_name))
+        .{ name, @as(vk.PfnVoidFunction, @ptrCast(&@field(@This(), stroll_name))) }
+    else
+        .{ name, null };
 }
 
 const icd_pfn_map = std.StaticStringMap(vk.PfnVoidFunction).initComptime(.{
@@ -59,6 +56,7 @@ const physical_device_pfn_map = std.StaticStringMap(vk.PfnVoidFunction).initComp
     functionMapElement("vkGetPhysicalDeviceProperties"),
     functionMapElement("vkGetPhysicalDeviceMemoryProperties"),
     functionMapElement("vkGetPhysicalDeviceQueueFamilyProperties"),
+    functionMapElement("vkGetPhysicalDeviceSparseImageFormatProperties"),
 });
 
 const device_pfn_map = std.StaticStringMap(vk.PfnVoidFunction).initComptime(.{
@@ -76,10 +74,6 @@ pub export fn vk_icdGetInstanceProcAddr(p_instance: vk.Instance, p_name: ?[*:0]c
     if (p_name == null) return null;
     const name = std.mem.span(p_name.?);
 
-    std.log.scoped(.vk_icdGetInstanceProcAddr).info("Loading {s}...", .{name});
-    logger.indent();
-    defer logger.unindent();
-
     if (icd_pfn_map.get(name)) |pfn| return pfn;
     return vkGetInstanceProcAddr(p_instance, p_name);
 }
@@ -88,10 +82,6 @@ pub export fn stroll_icdGetPhysicalDeviceProcAddr(_: vk.Instance, p_name: ?[*:0]
     if (p_name == null) return null;
     const name = std.mem.span(p_name.?);
 
-    std.log.scoped(.vk_icdGetPhysicalDeviceProcAddr).info("Loading {s}...", .{name});
-    logger.indent();
-    defer logger.unindent();
-
     if (physical_device_pfn_map.get(name)) |pfn| return pfn;
 
     std.log.scoped(.vk_icdGetPhysicalDeviceProcAddr).err("Could not find function {s}", .{name});
@@ -104,10 +94,6 @@ pub export fn vkGetInstanceProcAddr(p_instance: vk.Instance, p_name: ?[*:0]const
     if (p_name == null) return null;
     const name = std.mem.span(p_name.?);
 
-    std.log.scoped(.vkGetInstanceProcAddr).info("Loading {s}...", .{name});
-    logger.indent();
-    defer logger.unindent();
-
     if (global_pfn_map.get(name)) |pfn| return pfn;
     if (p_instance == .null_handle) {
         std.log.scoped(.vkGetInstanceProcAddr).err("Could not find global entrypoint {s}", .{name});
@@ -245,6 +231,27 @@ pub export fn strollGetPhysicalDeviceQueueFamilyProperties(p_physical_device: vk
     count.* = 0;
 }
 
+pub export fn strollGetPhysicalDeviceSparseImageFormatProperties(
+    p_physical_device: vk.PhysicalDevice,
+    format: vk.Format,
+    image_type: vk.ImageType,
+    samples: vk.SampleCountFlags,
+    tiling: vk.ImageTiling,
+    usage: vk.ImageUsageFlags,
+    flags: vk.ImageCreateFlags,
+    properties: *vk.SparseImageFormatProperties,
+) callconv(vk.vulkan_call_conv) vk.Result {
+    _ = p_physical_device;
+    _ = format;
+    _ = image_type;
+    _ = samples;
+    _ = tiling;
+    _ = usage;
+    _ = flags;
+    _ = properties;
+    return .error_format_not_supported;
+}
+
 // Device functions ==========================================================================================================================================
 
 pub export fn strollDestroyDevice(p_device: vk.Device, callbacks: ?*const vk.AllocationCallbacks) callconv(vk.vulkan_call_conv) void {
@@ -262,10 +269,6 @@ pub export fn strollGetDeviceProcAddr(p_device: vk.Device, p_name: ?[*:0]const u
     if (p_name == null) return null;
     const name = std.mem.span(p_name.?);
 
-    std.log.scoped(.vkGetDeviceProcAddr).info("Loading {s}...", .{name});
-    logger.indent();
-    defer logger.unindent();
-
     if (p_device == .null_handle) return null;
     if (device_pfn_map.get(name)) |pfn| return pfn;
 

src/vulkan/logger.zig

@@ -69,7 +69,7 @@ pub fn log(comptime level: std.log.Level, comptime scope: @Type(.enum_literal),
     const now = zdt.Datetime.now(.{ .tz = &timezone }) catch return;
 
     out_config.setColor(writer, .magenta) catch {};
-    writer.print("[" ++ root.DRIVER_NAME ++ "Driver ", .{}) catch return;
+    writer.print("[" ++ root.DRIVER_NAME ++ " StrollDriver ", .{}) catch return;
     out_config.setColor(writer, .yellow) catch {};
     writer.print("{d:02}:{d:02}:{d:02}.{d:03}", .{ now.hour, now.minute, now.second, @divFloor(now.nanosecond, std.time.ns_per_ms) }) catch return;
     out_config.setColor(writer, .magenta) catch {};