1 files changed, 57 insertions, 5 deletions
diff --git a/src/screen/main.zig b/src/screen/main.zig
index b0e5b2e..1a33fd0 100644
--- a/src/screen/main.zig
+++ b/src/screen/main.zig
@@ -5,16 +5,68 @@ pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const allocator = gpa.allocator();
 
-    var card = try drm.Card.open("card1", allocator);
+    var card = try drm.Card.open("card0", allocator);
     defer card.close();
 
     var resources = try card.resources();
     defer resources.deinit();
 
-    std.debug.print("id: {}\n", .{resources.crtc_ids[0]});
+    var connector = try card.connector(resources.connector_ids[0]);
+    defer connector.deinit();
 
-    var crtc = try card.crtc(resources.crtc_ids[0]);
-    defer crtc.deinit();
+    std.debug.print("connector = {}\n", .{ connector.id });
 
-    std.debug.print("crtc: {any}\n", .{crtc});
+    const mode = connector.modes[0];
+
+    std.debug.print("mode = {s}@{d}Hz\n", .{ mode.name, mode.frame_rate() });
+
+    var crtc = try crtc: {
+        for (connector.encoder_ids) |encoder_id| {
+            var encoder = try card.encoder(encoder_id);
+            defer encoder.deinit();
+
+            for (resources.crtc_ids, 0..) |crtc_id, index| {
+                if ((encoder.possible_crtcs & (@as(u32, 1) << @intCast(index))) != 0) {
+                    break :crtc card.crtc(crtc_id);
+                }
+            }
+        }
+
+        break :crtc error.CrtcNotFound;
+    };
+    defer crtc.detach();
+
+    std.debug.print("crtc = {}\n", .{ crtc.id });
+
+    var framebuffer = try card.create_frame_buffer(mode.horizontal.size, mode.vertical.size, 32);
+    defer framebuffer.deinit();
+
+    std.debug.print("framebuffer = {}, {}\n", .{ framebuffer.id, framebuffer.canvas_size });
+
+    try crtc.attach(&framebuffer, &connector, mode);
+
+    var frame: u24 = 0;
+
+    while (true) {
+        for (0..framebuffer.width) |x| {
+            for (0..framebuffer.height) |y| {
+                const raster_x = (frame + x) / 100 * 100;
+                const raster_y = y / 100 * 100;
+                const color = ((raster_x + raster_y) + 0x129453) * 0x329120;
+                framebuffer.set(@intCast(x), @intCast(y), .{
+                    .red = @intCast(color & 0xff),
+                    .green = @intCast((color >> 8) & 0xff),
+                    .blue = @intCast((color >> 16) & 0xff),
+                });
+            }
+        }
+
+        frame, _ = @addWithOverflow(frame, 1);
+
+        try crtc.attach(&framebuffer, &connector, mode);
+
+        std.time.sleep(@intFromFloat(1000000000 / mode.frame_rate()));
+    }
+
+    while (true) { std.time.sleep(5000000000); }
 }