screen: start drm implementation

1 files changed, 45 insertions, 0 deletions

diff --git a/src/screen/drm/card.zig b/src/screen/drm/card.zig
new file mode 100644
index 0000000..67f81f3
--- /dev/null
+++ b/src/screen/drm/card.zig
@@ -0,0 +1,45 @@
+const std = @import("std");
+const os = std.os.linux;
+
+const cerror = @import("../cerror.zig");
+
+const Resources = @import("resources.zig").Resources;
+const Connector = @import("connector.zig").Connector;
+
+
+pub const Card = struct {
+    const Self = @This();
+
+    file: std.fs.File,
+    allocator: std.mem.Allocator,
+
+    pub fn open(name: []const u8, allocator: std.mem.Allocator) !Self {
+        var dri_dir = try std.fs.openDirAbsolute("/dev/dri", .{});
+        defer dri_dir.close();
+
+        return .{
+            .file = try dri_dir.openFile(name, .{
+                .mode = .read_write,
+                .lock_nonblocking = true,
+            }),
+            .allocator = allocator,
+        };
+    }
+
+    pub fn close(self: *Card) void {
+        self.file.close();
+    }
+
+    pub fn is_kms(self: *Card) !bool {
+        const raw_info = Resources.raw_without_ids(self);
+        return raw_info.count_crtcs > 0 and raw_info.count_connectors > 0 and raw_info.count_encoders > 0;
+    }
+
+    pub fn resources(self: *Card) !Resources {
+        return Resources.init(self);
+    }
+
+    pub fn connector(self: *Card, id: u32) !Connector {
+        return Connector.init(self, id);
+    }
+};