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mode api working through CRTC phase.

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Jackson Netherwood-Imig
2026-01-21 16:40:13 -08:00
parent 610fc4cc75
commit 13b38e4967
4 changed files with 431 additions and 183 deletions
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example.zig
+35 -25
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@@ -5,34 +5,44 @@ pub fn main(init: std.process.Init) !void {
const io = init.io;
const gpa = init.gpa;
const card = try drm.Card.openAuto(io);
const card = try drm.mode.Card.openAuto(io);
defer card.close(io);
const res = try card.getResourcesAlloc(gpa);
defer res.deinit(gpa);
std.log.info("Using drm.Card.getModeAlloc...", .{});
const mode_res_1 = try card.getModeAlloc(gpa);
defer mode_res_1.deinit(gpa);
const connector = try chooseConnector(card, gpa, res.connectors);
defer connector.deinit(gpa);
std.log.info("Selected connector {}.", .{connector.id});
std.log.info("Min dimensions: {d}x{d}.", .{ mode_res_1.min_width, mode_res_1.min_height });
std.log.info("Max dimensions: {d}x{d}.", .{ mode_res_1.max_width, mode_res_1.max_height });
const mode = chooseMode(connector.modes);
std.log.info("Selected mode {}x{}@{}.", .{ mode.hdisplay, mode.vdisplay, mode.vrefresh });
std.log.info("Got {d} fbs: {any}.", .{ mode_res_1.fbs.len, mode_res_1.fbs });
std.log.info("Got {d} crtcs: {any}.", .{ mode_res_1.crtcs.len, mode_res_1.crtcs });
std.log.info("Got {d} connectors: {any}.", .{ mode_res_1.connectors.len, mode_res_1.connectors });
std.log.info("Got {d} encoders: {any}.", .{ mode_res_1.encoders.len, mode_res_1.encoders });
const encoder = try card.getEncoder(connector.encoder_id);
std.log.info("Selected encoder {} (type: {t}).", .{ encoder.id, encoder.type });
var fb_buf: [16]u32 = undefined;
var crtc_buf: [16]u32 = undefined;
var connector_buf: [16]u32 = undefined;
var encoder_buf: [16]u32 = undefined;
std.log.info("Using drm.Card.getModeBuffered...", .{});
const mode_res_2 = try card.getModeBuffered(&fb_buf, &crtc_buf, &connector_buf, &encoder_buf);
std.log.info("Min dimensions: {d}x{d}.", .{ mode_res_2.min_width, mode_res_2.min_height });
std.log.info("Max dimensions: {d}x{d}.", .{ mode_res_2.max_width, mode_res_2.max_height });
std.log.info("Got {d} fbs: {any}.", .{ mode_res_2.fbs.len, mode_res_2.fbs });
std.log.info("Got {d} crtcs: {any}.", .{ mode_res_2.crtcs.len, mode_res_2.crtcs });
std.log.info("Got {d} connectors: {any}.", .{ mode_res_2.connectors.len, mode_res_2.connectors });
std.log.info("Got {d} encoders: {any}.", .{ mode_res_2.encoders.len, mode_res_2.encoders });
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;
}