screen: add crtc

4 files changed, 56 insertions, 5 deletions

diff --git a/src/screen/drm/card.zig b/src/screen/drm/card.zig
index c5cca24..411716a 100644
--- a/src/screen/drm/card.zig
+++ b/src/screen/drm/card.zig
@@ -6,6 +6,7 @@ const cerror = @import("../cerror.zig");
 const Resources = @import("resources.zig").Resources;
 const Connector = @import("connector/root.zig").Connector;
 const Encoder = @import("encoder/root.zig").Encoder;
+const Crtc = @import("crtc/root.zig").Crtc;
 
 
 pub const Card = struct {
@@ -47,4 +48,8 @@ pub const Card = struct {
     pub fn encoder(self: *Card, id: u32) !Encoder {
         return Encoder.init(self, id);
     }
+
+    pub fn crtc(self: *Card, id: u32) !Crtc {
+        return Crtc.init(self, id);
+    }
 };
diff --git a/src/screen/drm/crtc/root.zig b/src/screen/drm/crtc/root.zig
new file mode 100644
index 0000000..7601732
--- /dev/null
+++ b/src/screen/drm/crtc/root.zig
@@ -0,0 +1,45 @@
+const std = @import("std");
+const Card = @import("../card.zig").Card;
+const Drm = @import("../request.zig").Drm;
+const Connector = @import("../connector/root.zig").Connector;
+
+pub const RawCrtc = extern struct {
+    connectors: ?*Connector,
+    count_connectors: u32,
+    id: u32,
+    buffer_id: u32,
+    x: u32,
+    y: u32,
+    gamma_size: u32,
+    mode_valid: u32,
+};
+
+pub const Crtc = struct {
+    const Self = @This();
+
+    id: u32,
+    buffer_id: u32,
+    x: u32,
+    y: u32,
+    mode_valid: u32,
+    gamma_size: u32,
+    card: *Card,
+
+    pub fn init(card: *Card, id: u32) !Self {
+        var raw = std.mem.zeroInit(RawCrtc, .{ .id = id });
+        try Drm.get_crtc.request(card.file.handle, RawCrtc, &raw);
+        return .{
+            .id = raw.id,
+            .buffer_id = raw.buffer_id,
+            .x = raw.x,
+            .y = raw.y,
+            .mode_valid = raw.mode_valid,
+            .gamma_size = raw.gamma_size,
+            .card = card,
+        };
+    }
+
+    pub fn deinit(self: *Self) void {
+        _ = self;
+    }
+};
diff --git a/src/screen/drm/request.zig b/src/screen/drm/request.zig
index 13ccfd3..f833c94 100644
--- a/src/screen/drm/request.zig
+++ b/src/screen/drm/request.zig
@@ -10,6 +10,7 @@ pub const Drm = enum(u8) {
     const Self = @This();
 
     get_resources = 0xa0,
+    get_crtc = 0xa1,
     get_encoder = 0xa6,
     get_connector = 0xa7,
 
diff --git a/src/screen/main.zig b/src/screen/main.zig
index de8e5aa..b0e5b2e 100644
--- a/src/screen/main.zig
+++ b/src/screen/main.zig
@@ -11,10 +11,10 @@ pub fn main() !void {
     var resources = try card.resources();
     defer resources.deinit();
 
-    for (resources.encoder_ids) |id| {
-        var encoder = try card.encoder(id);
-        defer encoder.deinit();
+    std.debug.print("id: {}\n", .{resources.crtc_ids[0]});
 
-        std.debug.print("{}\n", .{encoder});
-    }
+    var crtc = try card.crtc(resources.crtc_ids[0]);
+    defer crtc.deinit();
+
+    std.debug.print("crtc: {any}\n", .{crtc});
 }