diff --git a/build.zig b/build.zig
index 76972ca..0230034 100644
--- a/build.zig
+++ b/build.zig
@@ -1,8 +1,5 @@
 const std = @import("std");
 
-// Although this function looks imperative, note that its job is to
-// declaratively construct a build graph that will be executed by an external
-// runner.
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
@@ -18,31 +15,16 @@ pub fn build(b: *std.Build) void {
 
     exe.root_module.addImport("sokol", dep_sokol.module("sokol"));
 
-    // This declares intent for the executable to be installed into the
-    // standard location when the user invokes the "install" step (the default
-    // step when running `zig build`).
     b.installArtifact(exe);
 
-    // This *creates* a Run step in the build graph, to be executed when another
-    // step is evaluated that depends on it. The next line below will establish
-    // such a dependency.
     const run_cmd = b.addRunArtifact(exe);
 
-    // By making the run step depend on the install step, it will be run from the
-    // installation directory rather than directly from within the cache directory.
-    // This is not necessary, however, if the application depends on other installed
-    // files, this ensures they will be present and in the expected location.
     run_cmd.step.dependOn(b.getInstallStep());
 
-    // This allows the user to pass arguments to the application in the build
-    // command itself, like this: `zig build run -- arg1 arg2 etc`
     if (b.args) |args| {
         run_cmd.addArgs(args);
     }
 
-    // This creates a build step. It will be visible in the `zig build --help` menu,
-    // and can be selected like this: `zig build run`
-    // This will evaluate the `run` step rather than the default, which is "install".
     const run_step = b.step("run", "Run the app");
     run_step.dependOn(&run_cmd.step);
 
@@ -54,9 +36,6 @@ pub fn build(b: *std.Build) void {
 
     const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
 
-    // Similar to creating the run step earlier, this exposes a `test` step to
-    // the `zig build --help` menu, providing a way for the user to request
-    // running the unit tests.
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_exe_unit_tests.step);
 }
diff --git a/build.zig.zon b/build.zig.zon
index 069b37b..8090a16 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -8,50 +8,11 @@
             .url = "git+https://github.com/floooh/sokol-zig.git#d3e21f76498213d6d58179065756f5f2ed9b90cf",
             .hash = "122052a192829b377c637ce242ee8c9121e03d8cd10c889758dc6fb176368de7d67b",
         },
-        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
-        //.example = .{
-        //    // When updating this field to a new URL, be sure to delete the corresponding
-        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
-        //    // the new URL.
-        //    .url = "https://example.com/foo.tar.gz",
-        //
-        //    // This is computed from the file contents of the directory of files that is
-        //    // obtained after fetching `url` and applying the inclusion rules given by
-        //    // `paths`.
-        //    //
-        //    // This field is the source of truth; packages do not come from a `url`; they
-        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
-        //    // obtain a package matching this `hash`.
-        //    //
-        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
-        //    .hash = "...",
-        //
-        //    // When this is provided, the package is found in a directory relative to the
-        //    // build root. In this case the package's hash is irrelevant and therefore not
-        //    // computed. This field and `url` are mutually exclusive.
-        //    .path = "foo",
-
-        //    // When this is set to `true`, a package is declared to be lazily
-        //    // fetched. This makes the dependency only get fetched if it is
-        //    // actually used.
-        //    .lazy = false,
-        //},
     },
 
-    // Specifies the set of files and directories that are included in this package.
-    // Only files and directories listed here are included in the `hash` that
-    // is computed for this package. Only files listed here will remain on disk
-    // when using the zig package manager. As a rule of thumb, one should list
-    // files required for compilation plus any license(s).
-    // Paths are relative to the build root. Use the empty string (`""`) to refer to
-    // the build root itself.
-    // A directory listed here means that all files within, recursively, are included.
     .paths = .{
         "build.zig",
         "build.zig.zon",
         "src",
-        // For example...
-        //"LICENSE",
-        //"README.md",
     },
 }
diff --git a/src/main.zig b/src/main.zig
index 3bdb8d6..ffe0391 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -3,11 +3,6 @@ const std = @import("std");
 const sokol = @import("sokol");
 const sg = sokol.gfx;
 
-const state = struct {
-    var bind: sg.Bindings = .{};
-    var pip: sg.Pipeline = .{};
-};
-
 var pass_action: sg.PassAction = .{};
 
 export fn init() void {
@@ -27,13 +22,13 @@ export fn init() void {
 }
 
 fn timef() f32 {
-    return @as(f32, @floatCast(sokol.time.sec(sokol.time.now())));
+    return @floatCast(sokol.time.sec(sokol.time.now()));
 }
 
 export fn frame() void {
-    //std.log.info("{}", .{sokol.time.now()});
-
-    pass_action.colors[0].clear_value.g = @abs(@sin(timef()));
+    const col = &pass_action.colors[0].clear_value;
+    col.g = @abs(@sin(timef()));
+    col.r = @abs(@cos(timef()));
 
     sg.beginPass(.{ .action = pass_action, .swapchain = sokol.glue.swapchain() });
     sg.endPass();