Initial project import

tools/v/vlib/gg/frame_pacing_test.v

@@ -0,0 +1,52 @@
+// vtest build: !docker-ubuntu-musl // needs GL/gl.h
+module gg
+
+import encoding.base64
+import time
+
+fn test_swap_interval_frame_budget() {
+	assert swap_interval_frame_budget(-1) == time.Duration(0)
+	assert swap_interval_frame_budget(0) == time.Duration(0)
+	assert swap_interval_frame_budget(1) == time.second / 60
+	assert swap_interval_frame_budget(2) == time.second / 30
+	assert swap_interval_frame_budget(3) == time.second / 20
+}
+
+fn test_parse_screenshot_frames_ignores_blank_entries() {
+	assert parse_screenshot_frames('') == []u64{}
+	assert parse_screenshot_frames('1, 2,,4 ') == [u64(1), 2, 4]
+}
+
+fn test_new_gg_recorder_settings_stdout_defaults_to_first_frame() {
+	settings := new_gg_recorder_settings_from_env({
+		'VGG_SCREENSHOT_OUTPUT': 'stdout'
+	}, '/tmp/minimal_demo')
+	assert settings.screenshot_output == .stdout
+	assert settings.screenshot_frames == [u64(1)]
+	assert settings.stop_at_frame == 1
+}
+
+fn test_new_gg_recorder_settings_stdout_uses_last_frame_as_default_stop() {
+	settings := new_gg_recorder_settings_from_env({
+		'VGG_SCREENSHOT_OUTPUT': 'stdout'
+		'VGG_SCREENSHOT_FRAMES': '2, 4'
+	}, '/tmp/minimal_demo')
+	assert settings.screenshot_frames == [u64(2), 4]
+	assert settings.stop_at_frame == 4
+}
+
+fn test_new_gg_recorder_settings_preserves_explicit_stop_frame() {
+	settings := new_gg_recorder_settings_from_env({
+		'VGG_SCREENSHOT_OUTPUT': 'stdout'
+		'VGG_SCREENSHOT_FRAMES': '3'
+		'VGG_STOP_AT_FRAME':     '9'
+	}, '/tmp/minimal_demo')
+	assert settings.stop_at_frame == 9
+}
+
+fn test_screenshot_stdout_payload_contains_expected_marker() {
+	png := [u8(0x89), `P`, `N`, `G`]
+	encoded := base64.encode(png)
+	payload := screenshot_stdout_payload(7, png)
+	assert payload == '${gg_record_stdout_prefix} frame=7 format=png encoding=base64 data=${encoded}'
+}