From e79a3181dc9a64232ead448946c70dabb35d5b30 Mon Sep 17 00:00:00 2001
From: Arthur Vimond <ArthurVimond@users.noreply.github.com>
Date: Mon, 6 Oct 2025 23:31:54 +0200
Subject: [PATCH] [orx-syphon] Fix wrong Syphon resolution with alternate
 RenderTarget (#378)

---
 .../src/demo/kotlin/DemoServer02.kt           | 44 +++++++++++++++++++
 .../ServerExampleAlternateRenderTarget.kt     | 36 ---------------
 .../src/main/kotlin/SyphonServer.kt           | 12 ++---
 3 files changed, 51 insertions(+), 41 deletions(-)
 create mode 100644 orx-jvm/orx-syphon/src/demo/kotlin/DemoServer02.kt
 delete mode 100644 orx-jvm/orx-syphon/src/demo/kotlin/ServerExampleAlternateRenderTarget.kt

diff --git a/orx-jvm/orx-syphon/src/demo/kotlin/DemoServer02.kt b/orx-jvm/orx-syphon/src/demo/kotlin/DemoServer02.kt
new file mode 100644
index 00000000..b6c8a796
--- /dev/null
+++ b/orx-jvm/orx-syphon/src/demo/kotlin/DemoServer02.kt
@@ -0,0 +1,44 @@
+import jsyphon.SyphonServer
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.isolatedWithTarget
+import org.openrndr.draw.renderTarget
+import kotlin.math.abs
+import kotlin.math.cos
+import kotlin.math.sin
+
+/* This demo uses an alternate RenderTarget to send frames to Syphon (instead of the entire screen).
+* */
+fun main() {
+    // force to use GL driver
+    System.setProperty("org.openrndr.gl3.gl_type", "gl")
+    application {
+        configure {
+            width = 1000
+            height = 1000
+        }
+
+        program {
+            val rt = renderTarget(100, 100) {
+                colorBuffer()
+            }
+
+            // You can give the server a different name
+            extend(SyphonServer("Test", rt))
+
+            extend {
+                /**
+                 * This is what will be sent to Syphon, and drawn in a small corner of the screen
+                 */
+                drawer.isolatedWithTarget(rt) {
+                    drawer.clear(ColorRGBa(sin(seconds), cos(seconds / 2.0), 0.5, 1.0))
+                }
+
+                drawer.clear(ColorRGBa.PINK)
+                drawer.fill = ColorRGBa.WHITE
+                drawer.circle(drawer.bounds.center, abs(cos(seconds)) * height * 0.5)
+                drawer.image(rt.colorBuffer(0))
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/orx-jvm/orx-syphon/src/demo/kotlin/ServerExampleAlternateRenderTarget.kt b/orx-jvm/orx-syphon/src/demo/kotlin/ServerExampleAlternateRenderTarget.kt
deleted file mode 100644
index 53e25761..00000000
--- a/orx-jvm/orx-syphon/src/demo/kotlin/ServerExampleAlternateRenderTarget.kt
+++ /dev/null
@@ -1,36 +0,0 @@
-//import org.openrndr.application
-//import org.openrndr.color.ColorRGBa
-//import org.openrndr.draw.isolatedWithTarget
-//import org.openrndr.draw.renderTarget
-//import org.openrndr.extra.syphon.SyphonServer
-//import kotlin.math.*
-//
-//fun main() = application {
-//    configure {
-//        width = 1000
-//        height = 1000
-//    }
-//
-//    program {
-//        val rt = renderTarget(100, 100) {
-//            colorBuffer()
-//        }
-//
-//        // You can give the server a different name
-//        extend(SyphonServer("Test", rt))
-//
-//        extend {
-//            /**
-//             * This is what will be sent to Syphon, and drawn in a small corner of the screen
-//             */
-//            drawer.isolatedWithTarget(rt) {
-//                drawer.clear(ColorRGBa(sin(seconds), cos(seconds / 2.0), 0.5, 1.0))
-//            }
-//
-//            drawer.clear(ColorRGBa.PINK)
-//            drawer.fill = ColorRGBa.WHITE
-//            drawer.circle(drawer.bounds.center, abs(cos(seconds)) * height * 0.5)
-//            drawer.image(rt.colorBuffer(0))
-//        }
-//    }
-//}
\ No newline at end of file
diff --git a/orx-jvm/orx-syphon/src/main/kotlin/SyphonServer.kt b/orx-jvm/orx-syphon/src/main/kotlin/SyphonServer.kt
index 1c5cb4a6..c0dd9b32 100644
--- a/orx-jvm/orx-syphon/src/main/kotlin/SyphonServer.kt
+++ b/orx-jvm/orx-syphon/src/main/kotlin/SyphonServer.kt
@@ -53,11 +53,13 @@ class SyphonServer(private val name: String = "OPENRNDR", var providedTarget: Re
 
         val glBuffer = targetToSend?.colorBuffer(0) as ColorBufferGL3
 
-        // Send to Syphon
-        server.publishFrameTexture(
-            glBuffer.texture, glBuffer.target, 0, 0,
-            program.width, program.height, program.width, program.height, false
-        )
+        targetToSend?.let { targetToSend ->
+            // Send to Syphon
+            server.publishFrameTexture(
+                glBuffer.texture, glBuffer.target, 0, 0,
+                targetToSend.width, targetToSend.height, targetToSend.width, targetToSend.height, false
+            )
+        }
     }
 
     override fun shutdown(program: Program) {