gg: move code using C types to c.v files, add js.v files (#12873)

vlib/gg/recorder.c.v

@@ -0,0 +1,41 @@
+module gg
+
+import sokol.sapp
+import os
+
+[if gg_record ?]
+pub fn (mut ctx Context) record_frame() {
+	if ctx.frame in gg.recorder_settings.screenshot_frames {
+		screenshot_file_path := '$gg.recorder_settings.screenshot_prefix${ctx.frame}.png'
+		$if gg_record_trace ? {
+			eprintln('>>> screenshoting $screenshot_file_path')
+		}
+
+		sapp.screenshot_png(screenshot_file_path) or { panic(err) }
+	}
+	if ctx.frame == gg.recorder_settings.stop_at_frame {
+		$if gg_record_trace ? {
+			eprintln('>>> exiting at frame $ctx.frame')
+		}
+		exit(0)
+	}
+}
+
+fn new_gg_recorder_settings() &SSRecorderSettings {
+	$if gg_record ? {
+		stop_frame := os.getenv_opt('VGG_STOP_AT_FRAME') or { '-1' }.i64()
+		frames := os.getenv('VGG_SCREENSHOT_FRAMES').split_any(',').map(it.u64())
+		folder := os.getenv('VGG_SCREENSHOT_FOLDER')
+		prefix := os.join_path_single(folder, os.file_name(os.executable()).all_before('.') + '_')
+		return &SSRecorderSettings{
+			stop_at_frame: stop_frame
+			screenshot_frames: frames
+			screenshot_folder: folder
+			screenshot_prefix: prefix
+		}
+	} $else {
+		return &SSRecorderSettings{}
+	}
+}
+
+const recorder_settings = new_gg_recorder_settings()