Jackson Netherwood-Imig
59 lines
2.0 KiB
Zig
59 lines
2.0 KiB
Zig
const std = @import("std");
|
|
const drm = @import("drm");
|
|
|
|
pub fn main(init: std.process.Init) !void {
|
|
const io = init.io;
|
|
const gpa = init.gpa;
|
|
|
|
const card = try drm.Card.openAuto(io, .primary);
|
|
defer card.close(io);
|
|
|
|
const device = try card.getDevice(io, gpa, .{});
|
|
std.log.info("Device node path: {s}.", .{device.nodePath()});
|
|
|
|
const version = try card.getVersion(gpa);
|
|
defer version.deinit(gpa);
|
|
|
|
std.log.info("Version: {}.{}.{}.", .{ version.major, version.minor, version.patch });
|
|
std.log.info("Name: {s}, date: {s}, desc: {s}.", .{ version.name, version.date, version.desc });
|
|
|
|
const res = try card.getModesettingResources(gpa);
|
|
defer res.deinit(gpa);
|
|
|
|
const connector = try chooseConnector(card, gpa, res.connectors);
|
|
defer connector.deinit(gpa);
|
|
std.log.info("Selected connector {}.", .{connector.id});
|
|
|
|
const mode = chooseMode(connector.modes);
|
|
std.log.info("Selected mode {}x{}@{}.", .{ mode.hdisplay, mode.vdisplay, mode.vrefresh });
|
|
|
|
const encoder = try card.getEncoder(connector.encoder_id);
|
|
std.log.info("Selected encoder {} (type: {t}).", .{ encoder.id, encoder.type });
|
|
|
|
const crtc = try card.getCrtc(encoder.crtc_id);
|
|
std.log.info("Selected crtc {} (mode valid: {}).", .{ crtc.id, crtc.mode != null });
|
|
}
|
|
|
|
fn chooseConnector(
|
|
card: drm.Card,
|
|
gpa: std.mem.Allocator,
|
|
connectors: []const u32,
|
|
) !drm.Connector {
|
|
for (connectors) |id| {
|
|
const connector = try card.getConnector(gpa, id);
|
|
if (connector.connection == .connected) return connector;
|
|
connector.deinit(gpa);
|
|
}
|
|
return error.NoConnectedConnectors;
|
|
}
|
|
|
|
fn chooseMode(modes: []const drm.sys.mode.ModeInfo) drm.sys.mode.ModeInfo {
|
|
var best = modes[0];
|
|
const best_score = @as(u64, best.hdisplay) * @as(u64, best.vdisplay) * @as(u64, best.vrefresh);
|
|
for (modes) |mode| {
|
|
const score = @as(u64, mode.hdisplay) * @as(u64, mode.vdisplay) * @as(u64, mode.vrefresh);
|
|
if (score > best_score) best = mode;
|
|
}
|
|
return best;
|
|
}
|