forked from mirror/vulkan-zig
Rendering setup
This commit is contained in:
Robin Voetter
@@ -1,3 +1,298 @@
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const std = @import("std");
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const registry = @import("registry.zig");
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const Allocator = std.mem.Allocator,
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const reg = @import("registry.zig");
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const util = @import("render/util.zig");
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const mem = std.mem;
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const Allocator = mem.Allocator;
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const preamble =
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\\const std = @import("std");
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\\
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;
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const BuiltinType = struct {
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c_name: []const u8,
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zig_name: []const u8
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};
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const builtin_types = [_]BuiltinType{
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.{.c_name = "void", .zig_name = @typeName(void)},
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.{.c_name = "char", .zig_name = @typeName(u8)},
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.{.c_name = "float", .zig_name = @typeName(f32)},
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.{.c_name = "double", .zig_name = @typeName(f64)},
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.{.c_name = "uint8_t", .zig_name = @typeName(u8)},
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.{.c_name = "uint16_t", .zig_name = @typeName(u16)},
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.{.c_name = "uint32_t", .zig_name = @typeName(u32)},
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.{.c_name = "uint64_t", .zig_name = @typeName(u64)},
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.{.c_name = "int32_t", .zig_name = @typeName(i32)},
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.{.c_name = "int64_t", .zig_name = @typeName(i64)},
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.{.c_name = "size_t", .zig_name = @typeName(usize)},
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.{.c_name = "int", .zig_name = @typeName(c_int)},
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};
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fn eqlIgnoreCase(lhs: []const u8, rhs: []const u8) bool {
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if (lhs.len != rhs.len) {
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return false;
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}
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for (lhs) |c, i| {
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if (std.ascii.toLower(c) != std.ascii.toLower(rhs[i])) {
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return false;
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}
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}
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return true;
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}
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fn Renderer(comptime WriterType: type) type {
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return struct {
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const Self = @This();
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const WriteError = WriterType.Error;
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const RenderTypeInfoError = WriteError || error {
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OutOfMemory,
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};
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writer: WriterType,
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allocator: *Allocator,
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registry: *const reg.Registry,
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id_renderer: util.IdRenderer,
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fn init(writer: WriterType, allocator: *Allocator, registry: *const reg.Registry) Self {
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return .{
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.writer = writer,
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.allocator = allocator,
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.registry = registry,
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.id_renderer = util.IdRenderer.init(allocator, registry.tags),
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};
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}
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fn deinit(self: Self) void {
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self.id_renderer.deinit();
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}
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fn writeIdentifier(self: Self, id: []const u8) !void {
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try util.writeIdentifier(self.writer, id);
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}
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fn writeIdentifierWithCase(self: *Self, case: util.CaseStyle, id: []const u8) !void {
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try self.id_renderer.render(self.writer, case, id);
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}
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fn extractEnumFieldName(self: Self, enum_name: []const u8, field_name: []const u8) ![]const u8 {
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const tag = util.getAuthorTag(enum_name, self.registry.tags);
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const adjusted_enum_name = if (tag) |name|
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enum_name[0 .. enum_name.len - name.len]
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else
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enum_name;
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var enum_it = util.SegmentIterator.init(adjusted_enum_name);
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var field_it = util.SegmentIterator.init(field_name);
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while (true) {
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const rest = field_it.rest();
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const enum_segment = enum_it.next() orelse return rest;
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const field_segment = field_it.next() orelse return error.FieldNameEqualsEnumName;
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if (!eqlIgnoreCase(enum_segment, field_segment)) {
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return rest;
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}
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}
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}
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fn render(self: *Self) !void {
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try self.writer.writeAll(preamble);
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for (self.registry.decls) |decl| {
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try self.renderDecl(decl);
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}
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}
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fn renderTypeInfo(self: *Self, type_info: reg.TypeInfo) RenderTypeInfoError!void {
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switch (type_info) {
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.name => |name| try self.renderTypeName(name),
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.command_ptr => |command_ptr| try self.renderCommandPtr(command_ptr),
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.pointer => |pointer| try self.renderPointer(pointer),
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.array => |array| try self.renderArray(array),
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}
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}
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fn renderTypeName(self: *Self, name: []const u8) !void {
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for (builtin_types) |builtin_type| {
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if (mem.eql(u8, name, builtin_type.c_name)) {
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try self.writer.writeAll(builtin_type.zig_name);
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return;
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}
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}
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// TODO: Handle foreign types
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if (mem.startsWith(u8, name, "vk")) {
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// Function type, always render with the exact same text for linking purposes.
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try self.writeIdentifier(name);
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return;
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} else if (mem.startsWith(u8, name, "Vk")) {
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// Type, strip namespace and write, as they are alreay in title case.
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try self.writeIdentifier(name[2..]);
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return;
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} else if (mem.startsWith(u8, name, "PFN_vk")) {
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// Function pointer type, render using same name for now
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try self.writeIdentifier(name);
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return;
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}
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try self.writeIdentifier(name);
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}
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fn renderCommandPtr(self: *Self, command_ptr: reg.Command) !void {
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try self.writer.writeAll("?fn(");
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for (command_ptr.params) |param| {
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try self.writeIdentifierWithCase(.snake, param.name);
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try self.writer.writeAll(": ");
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try self.renderTypeInfo(param.param_type);
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try self.writer.writeAll(", ");
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}
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try self.writer.writeAll(") ");
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try self.renderTypeInfo(command_ptr.return_type.*);
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}
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fn renderPointer(self: *Self, pointer: reg.Pointer) !void {
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if (pointer.is_optional) {
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try self.writer.writeByte('?');
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}
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switch (pointer.size) {
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.one => try self.writer.writeByte('*'),
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.many => try self.writer.writeAll("[*]"),
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.zero_terminated => try self.writer.writeAll("[*:0]"),
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}
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if (pointer.is_const) {
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try self.writer.writeAll("const ");
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}
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// Special case: void pointers
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if (pointer.child.* == .name and mem.eql(u8, pointer.child.name, "void")) {
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try self.writer.writeAll("c_void");
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} else {
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try self.renderTypeInfo(pointer.child.*);
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}
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}
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fn renderArray(self: *Self, array: reg.Array) !void {
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try self.writer.writeByte('[');
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switch (array.size) {
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.int => |size| try self.writer.print("{}", .{size}),
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.alias => |alias| try self.writeIdentifier(alias[3..]), //TODO: Check proper VK_ prefix
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}
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try self.writer.writeByte(']');
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try self.renderTypeInfo(array.child.*);
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}
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fn renderDecl(self: *Self, decl: reg.Declaration) !void {
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switch (decl.decl_type) {
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.container => |container| try self.renderContainer(decl.name, container),
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.enumeration => |enumeration| try self.renderEnumeration(decl.name, enumeration),
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.alias => |alias| try self.renderAlias(decl.name, alias),
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.opaque => try self.renderOpaque(decl.name),
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.typedef => |type_info| try self.renderTypedef(decl.name, type_info),
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else => {}, // unhandled for now
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}
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}
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fn renderContainer(self: *Self, name: []const u8, container: reg.Container) !void {
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try self.writer.writeAll("const ");
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try self.renderTypeName(name);
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try self.writer.writeAll(" = ");
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for (container.fields) |field| {
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if (field.bits != null) {
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try self.writer.writeAll("packed ");
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break;
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}
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} else {
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try self.writer.writeAll("extern ");
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}
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if (container.is_union) {
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try self.writer.writeAll("union {");
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} else {
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try self.writer.writeAll("struct {");
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}
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for (container.fields) |field| {
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try self.writeIdentifierWithCase(.snake, field.name);
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try self.writer.writeAll(": ");
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try self.renderTypeInfo(field.field_type);
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// TODO: Generate struct defaults
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// TODO: Deal with packed structs
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try self.writer.writeAll(", ");
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}
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try self.writer.writeAll("};\n");
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}
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fn renderEnumeration(self: *Self, name: []const u8, enumeration: reg.Enum) !void {
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// TODO: Handle bitmasks
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try self.writer.writeAll("const ");
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try self.renderTypeName(name);
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try self.writer.writeAll(" = extern enum {");
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for (enumeration.fields) |field| {
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if (field.value == .alias) {
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continue;
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}
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try self.writeIdentifierWithCase(.snake, try self.extractEnumFieldName(name, field.name));
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switch (field.value) {
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.int => |int| try self.writer.print("= {}, ", .{int}),
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.bitpos => |pos| try self.writer.print(" = 1 << {}, ", .{pos}),
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.bit_vector => |value| try self.writer.print(" = 0x{X}, ", .{value}),
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.alias => unreachable,
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}
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}
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for (enumeration.fields) |field| {
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if (field.value != .alias or field.value.alias.is_compat_alias) {
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continue;
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}
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try self.writer.writeAll("pub const ");
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try self.writeIdentifierWithCase(.snake, try self.extractEnumFieldName(name, field.name));
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try self.writer.writeAll(" = ");
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try self.writeIdentifierWithCase(.snake, try self.extractEnumFieldName(name, field.value.alias.name));
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try self.writer.writeAll(";");
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}
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try self.writer.writeAll("};\n");
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}
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fn renderAlias(self: *Self, name: []const u8, alias: reg.Alias) !void {
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try self.writer.writeAll("const ");
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try self.renderTypeName(name);
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try self.writer.writeAll(" = ");
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try self.renderTypeName(alias.name);
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try self.writer.writeAll(";\n");
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}
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fn renderOpaque(self: *Self, name: []const u8) !void {
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try self.writer.writeAll("const ");
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try self.renderTypeName(name);
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try self.writer.writeAll(" = @Type(.Opaque);\n");
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}
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fn renderTypedef(self: *Self, name: []const u8, type_info: reg.TypeInfo) !void {
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try self.writer.writeAll("const ");
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try self.renderTypeName(name);
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try self.writer.writeAll(" = ");
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try self.renderTypeInfo(type_info);
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try self.writer.writeAll(";\n");
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}
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};
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}
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pub fn render(writer: var, allocator: *Allocator, registry: *const reg.Registry) !void {
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var renderer = Renderer(@TypeOf(writer)).init(writer, allocator, registry);
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defer renderer.deinit();
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try renderer.render();
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}
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