forked from mirror/vulkan-zig
83 lines
3.7 KiB
Zig
83 lines
3.7 KiB
Zig
const std = @import("std");
|
|
const generate = @import("generator.zig").generate;
|
|
const path = std.fs.path;
|
|
const Builder = std.build.Builder;
|
|
const Step = std.build.Step;
|
|
|
|
/// build.zig integration for Vulkan binding generation. This step can be used to generate
|
|
/// Vulkan bindings at compiletime from vk.xml, by providing the path to vk.xml and the output
|
|
/// path relative to zig-cache. The final package can then be obtained by `package()`, the result
|
|
/// of which can be added to the project using `std.build.Builder.addPackage`.
|
|
pub const GenerateStep = struct {
|
|
step: Step,
|
|
builder: *Builder,
|
|
|
|
/// The path to vk.xml
|
|
spec_path: []const u8,
|
|
|
|
/// The package representing the generated bindings. The generated bindings will be placed
|
|
/// in `package.path`. When using this step, this member should be passed to
|
|
/// `std.build.Builder.addPackage`, which causes the bindings to become available under the
|
|
/// name `vulkan`.
|
|
package: std.build.Pkg,
|
|
|
|
/// Initialize a Vulkan generation step, for `builder`. `spec_path` is the path to
|
|
/// vk.xml, relative to the project root. The generated bindings will be placed at
|
|
/// `out_path`, which is relative to the zig-cache directory.
|
|
pub fn init(builder: *Builder, spec_path: []const u8, out_path: []const u8) *GenerateStep {
|
|
const self = builder.allocator.create(GenerateStep) catch unreachable;
|
|
const full_out_path = path.join(builder.allocator, &[_][]const u8{
|
|
builder.build_root,
|
|
builder.cache_root,
|
|
out_path,
|
|
}) catch unreachable;
|
|
|
|
self.* = .{
|
|
.step = Step.init(.Custom, "vulkan-generate", builder.allocator, make),
|
|
.builder = builder,
|
|
.spec_path = spec_path,
|
|
.package = .{
|
|
.name = "vulkan",
|
|
.path = full_out_path,
|
|
.dependencies = null,
|
|
}
|
|
};
|
|
return self;
|
|
}
|
|
|
|
/// Initialize a Vulkan generation step for `builder`, by extracting vk.xml from the LunarG installation
|
|
/// root. Typically, the location of the LunarG SDK root can be retrieved by querying for the VULKAN_SDK
|
|
/// environment variable, set by activating the environment setup script located in the SDK root.
|
|
/// `builder` and `out_path` are used in the same manner as `init`.
|
|
pub fn initFromSdk(builder: *Builder, sdk_path: []const u8, out_path: []const u8) *GenerateStep {
|
|
const spec_path = std.fs.path.join(
|
|
builder.allocator,
|
|
&[_][]const u8{ sdk_path, "share/vulkan/registry/vk.xml" },
|
|
) catch unreachable;
|
|
|
|
return init(builder, spec_path, out_path);
|
|
}
|
|
|
|
/// Internal build function. This reads `vk.xml`, and passes it to `generate`, which then generates
|
|
/// the final bindings. The resulting generated bindings are not formatted, which is why an ArrayList
|
|
/// writer is passed instead of a file writer. This is then formatted into standard formatting
|
|
/// by parsing it and rendering with `std.zig.parse` and `std.zig.render` respectively.
|
|
fn make(step: *Step) !void {
|
|
const self = @fieldParentPtr(GenerateStep, "step", step);
|
|
const cwd = std.fs.cwd();
|
|
|
|
const spec = try cwd.readFileAlloc(self.builder.allocator, self.spec_path, std.math.maxInt(usize));
|
|
|
|
var out_buffer = std.ArrayList(u8).init(self.builder.allocator);
|
|
try generate(self.builder.allocator, spec, out_buffer.writer());
|
|
|
|
const tree = try std.zig.parse(self.builder.allocator, out_buffer.items);
|
|
|
|
var formatted = try tree.render(self.builder.allocator);
|
|
|
|
const dir = path.dirname(self.package.path).?;
|
|
try cwd.makePath(dir);
|
|
try cwd.writeFile(self.package.path, formatted);
|
|
}
|
|
};
|