diff --git a/spx-gui/src/components/editor/panels/ConsolePanel.vue b/spx-gui/src/components/editor/panels/ConsolePanel.vue
index 08a5851b1..1bd496918 100644
--- a/spx-gui/src/components/editor/panels/ConsolePanel.vue
+++ b/spx-gui/src/components/editor/panels/ConsolePanel.vue
@@ -24,17 +24,18 @@ function humanizeTime(time: number) {
 }
 
 function getOutputSourceLocation(output: RuntimeOutput) {
-  console.warn('TODO: use `output.source`', output) // TODO: see details in https://github.com/goplus/builder/issues/1096
+  if (output.source == null) return null
   return {
-    file: { uri: 'file:///main.spx' },
-    position: { line: 1, column: 1 }
+    file: output.source.textDocument,
+    position: output.source.range.start
   }
 }
 
-function getOutputSourceLocationText(runtime: RuntimeOutput) {
-  const { file, position } = getOutputSourceLocation(runtime)
-  const codeFileName = i18n.t(textDocumentId2CodeFileName(file))
-  return `${codeFileName}:${position.line}`
+function getOutputSourceLocationText(output: RuntimeOutput) {
+  const location = getOutputSourceLocation(output)
+  if (location == null) return ''
+  const codeFileName = i18n.t(textDocumentId2CodeFileName(location.file))
+  return `${codeFileName}:${location.position.line}`
 }
 </script>
 
@@ -60,9 +61,9 @@ function getOutputSourceLocationText(runtime: RuntimeOutput) {
         :class="`kind-${output.kind}`"
       >
         <span class="time">{{ humanizeTime(output.time) }}</span>
-        <CodeLink class="link" v-bind="getOutputSourceLocation(output)">{{
-          getOutputSourceLocationText(output)
-        }}</CodeLink>
+        <CodeLink v-if="getOutputSourceLocation(output) != null" class="link" v-bind="getOutputSourceLocation(output)!">
+          {{ getOutputSourceLocationText(output) }}
+        </CodeLink>
         <span class="message">{{ output.message }}</span>
       </li>
     </ul>
diff --git a/spx-gui/src/components/editor/preview/InPlaceRunner.vue b/spx-gui/src/components/editor/preview/InPlaceRunner.vue
index b7648d5c6..e014bbb37 100644
--- a/spx-gui/src/components/editor/preview/InPlaceRunner.vue
+++ b/spx-gui/src/components/editor/preview/InPlaceRunner.vue
@@ -14,7 +14,42 @@ const editorCtx = useEditorCtx()
 const projectRunnerRef = ref<InstanceType<typeof ProjectRunner>>()
 
 function handleConsole(type: 'log' | 'warn', args: unknown[]) {
-  // TODO: parse source
+  if (type === 'log' && args.length === 1 && typeof args[0] === 'string') {
+    try {
+      // Log format is determined by `github.com/goplus/builder/tools/ispx/main.go:logWithCallerInfo`.
+      //
+      // Example:
+      //     {
+      //       "time": "2025-01-14T11:50:34.808+08:00",
+      //       "level": "INFO",
+      //       "msg": "Hello, world!\n",
+      //       "function": "main.(*MySprite).Main.func1",
+      //       "file": "MySprite.spx",
+      //       "line": 2
+      //     }
+      const logMsg = JSON.parse(args[0])
+      if (logMsg.level === 'INFO') {
+        editorCtx.runtime.addOutput({
+          kind: RuntimeOutputKind.Log,
+          time: logMsg.time,
+          message: logMsg.msg,
+          source: {
+            textDocument: {
+              uri: `file:///${logMsg.file}`
+            },
+            range: {
+              start: { line: logMsg.line, column: 1 },
+              end: { line: logMsg.line, column: 1 }
+            }
+          }
+        })
+        return
+      }
+    } catch {
+      // If parsing fails, fall through to default handling.
+    }
+  }
+
   editorCtx.runtime.addOutput({
     kind: type === 'warn' ? RuntimeOutputKind.Error : RuntimeOutputKind.Log,
     time: Date.now(),
diff --git a/tools/ispx/go.mod b/tools/ispx/go.mod
index 0efba00d2..83875d7c3 100644
--- a/tools/ispx/go.mod
+++ b/tools/ispx/go.mod
@@ -3,7 +3,7 @@ module github.com/goplus/builder/ispx
 go 1.21
 
 require (
-	github.com/goplus/igop v0.28.0
+	github.com/goplus/igop v0.28.1
 	github.com/goplus/reflectx v1.2.2
 	github.com/goplus/spx v1.0.1-0.20241029011511-845f2c0e2e74
 	github.com/hajimehoshi/ebiten/v2 v2.8.0-alpha.3
diff --git a/tools/ispx/go.sum b/tools/ispx/go.sum
index 2e5b09b8f..de831969a 100644
--- a/tools/ispx/go.sum
+++ b/tools/ispx/go.sum
@@ -31,8 +31,8 @@ github.com/goplus/gogen v1.16.6-0.20250112152508-dc8cddfd52df h1:YIcLq6a7eGp3niB
 github.com/goplus/gogen v1.16.6-0.20250112152508-dc8cddfd52df/go.mod h1:6TQYbabXDF9LCdDkOOzHmfg1R4ENfXQ3XpHa9RhTSD8=
 github.com/goplus/gop v1.2.0-pre.1.0.20250112163018-5fb12b1b2972 h1:wA4+I+DDfoNwR+zCnaeckt5pxZgLAuaKvVkC+T9GdiQ=
 github.com/goplus/gop v1.2.0-pre.1.0.20250112163018-5fb12b1b2972/go.mod h1:lcW75c0a5v361jId1Vxs4lRrsasWsQDH0k3dG3Z7wH0=
-github.com/goplus/igop v0.28.0 h1:hbcZR2Z9Ax2y29ndkYZmXx5KE9YQPy/OV7mb9szKGHQ=
-github.com/goplus/igop v0.28.0/go.mod h1:ObprI7cQUSZN0LYeUX0+MqzpQ0MmeS5o1/ToDU+jfTg=
+github.com/goplus/igop v0.28.1 h1:I+T006IxENdHPn5vvebmSwoZp0BAy0WUybnnyB+tZWM=
+github.com/goplus/igop v0.28.1/go.mod h1:ObprI7cQUSZN0LYeUX0+MqzpQ0MmeS5o1/ToDU+jfTg=
 github.com/goplus/llgo v0.9.9/go.mod h1:udcq+s6tGOdhJq7I8fXPTv4qT2j17/KrlvtcJrMZAoM=
 github.com/goplus/llvm v0.8.0/go.mod h1:PeVK8GgzxwAYCiMiUAJb5wJR6xbhj989tu9oulKLLT4=
 github.com/goplus/mod v0.13.10/go.mod h1:HDuPZgpWiaTp3PUolFgsiX+Q77cbUWB/mikVHfYND3c=
diff --git a/tools/ispx/main.go b/tools/ispx/main.go
index 2c139c21a..3e7c36df5 100644
--- a/tools/ispx/main.go
+++ b/tools/ispx/main.go
@@ -6,7 +6,10 @@ package main
 import (
 	"archive/zip"
 	"bytes"
+	"fmt"
 	"log"
+	"log/slog"
+	"os"
 	"syscall/js"
 
 	_ "github.com/goplus/builder/ispx/pkg/github.com/goplus/spx"
@@ -34,6 +37,20 @@ func loadData(this js.Value, args []js.Value) interface{} {
 	return nil
 }
 
+var logger = slog.New(slog.NewJSONHandler(os.Stdout, nil))
+
+func logWithCallerInfo(msg string, frame *igop.Frame) {
+	if frs := frame.CallerFrames(); len(frs) > 0 {
+		fr := frs[0]
+		logger.Info(
+			msg,
+			"function", fr.Function,
+			"file", fr.File,
+			"line", fr.Line,
+		)
+	}
+}
+
 func main() {
 	js.Global().Set("goLoadData", js.FuncOf(loadData))
 
@@ -57,7 +74,7 @@ func main() {
 
 	// Register patch for spx to support functions with generic type like `Gopt_Game_Gopx_GetWidget`.
 	// See details in https://github.com/goplus/builder/issues/765#issuecomment-2313915805
-	err = gopbuild.RegisterPackagePatch(ctx, "github.com/goplus/spx", `
+	if err := gopbuild.RegisterPackagePatch(ctx, "github.com/goplus/spx", `
 package spx
 
 import (
@@ -72,11 +89,26 @@ func Gopt_Game_Gopx_GetWidget[T any](sg ShapeGetter, name string) *T {
 		panic("GetWidget: type mismatch")
 	}
 }
-`)
-	if err != nil {
-		log.Fatalln("Failed to register package patch:", err)
+`); err != nil {
+		log.Fatalln("Failed to register package patch for github.com/goplus/spx:", err)
 	}
 
+	ctx.RegisterExternal("fmt.Print", func(frame *igop.Frame, a ...interface{}) (n int, err error) {
+		msg := fmt.Sprint(a...)
+		logWithCallerInfo(msg, frame)
+		return len(msg), nil
+	})
+	ctx.RegisterExternal("fmt.Printf", func(frame *igop.Frame, format string, a ...interface{}) (n int, err error) {
+		msg := fmt.Sprintf(format, a...)
+		logWithCallerInfo(msg, frame)
+		return len(msg), nil
+	})
+	ctx.RegisterExternal("fmt.Println", func(frame *igop.Frame, a ...interface{}) (n int, err error) {
+		msg := fmt.Sprintln(a...)
+		logWithCallerInfo(msg, frame)
+		return len(msg), nil
+	})
+
 	source, err := gopbuild.BuildFSDir(ctx, fs, "")
 	if err != nil {
 		log.Fatalln("Failed to build Go+ source:", err)