Jackson Netherwood-Imig
49 lines
1.6 KiB
Zig
49 lines
1.6 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.mode.Card.openAuto(io);
|
|
defer card.close(io);
|
|
const res = try card.getResourcesAlloc(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.mode.Card,
|
|
gpa: std.mem.Allocator,
|
|
connectors: []const u32,
|
|
) !drm.mode.Connector {
|
|
for (connectors) |id| {
|
|
const connector = try card.getConnectorAlloc(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;
|
|
}
|