TinyGL example

apps/tinygl/src/console.zig

@@ -0,0 +1,49 @@
+const std = @import("std");
+extern fn console_write(data: [*]const u8, len: usize) void;
+var wbuf:[4096]u8 = undefined;
+var cw = ConsoleWriter.init(&wbuf);
+const uvm = @import("uvm.zig");
+
+pub const WriteError = error{ Unsupported, NotConnected };
+
+pub const ConsoleWriter = struct {
+    interface: std.Io.Writer,
+    err: ?WriteError = null,
+
+    fn drain(w: *std.Io.Writer, data: []const []const u8, splat: usize) std.Io.Writer.Error!usize {
+        var ret: usize = 0;
+
+        const b = w.buffered();
+        uvm.print(b);
+        _ = w.consume(b.len);
+
+        for (data) |d| {
+            uvm.print(d);
+            ret += d.len;
+        }
+
+        const pattern = data[data.len - 1];
+        for (0..splat) |_| {
+            uvm.print(pattern);
+            ret += pattern.len;
+        }
+
+        return ret;
+    }
+
+    pub fn init(buf: []u8) ConsoleWriter {
+        return ConsoleWriter{
+            .interface = .{
+                .buffer = buf,
+                .vtable = &.{
+                    .drain = drain,
+                },
+            },
+        };
+    }
+};
+
+pub fn getWriter() *std.Io.Writer {
+    return &cw.interface;
+}
+