From bd733284a33075c7958a144925af4b139d563b1e Mon Sep 17 00:00:00 2001
From: OpenSauce04 <opensauce04@gmail.com>
Date: Wed, 10 Jun 2026 12:54:11 +0100
Subject: [PATCH] android: Retrieve and log OpenGL renderer string

---
 .../org/citra/citra_emu/CitraApplication.kt   |   2 +
 .../org/citra/citra_emu/utils/GraphicsUtil.kt | 105 ++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 src/android/app/src/main/java/org/citra/citra_emu/utils/GraphicsUtil.kt

diff --git a/src/android/app/src/main/java/org/citra/citra_emu/CitraApplication.kt b/src/android/app/src/main/java/org/citra/citra_emu/CitraApplication.kt
index e1937159b..70ea2382c 100644
--- a/src/android/app/src/main/java/org/citra/citra_emu/CitraApplication.kt
+++ b/src/android/app/src/main/java/org/citra/citra_emu/CitraApplication.kt
@@ -12,6 +12,7 @@ import android.content.Context
 import android.os.Build
 import org.citra.citra_emu.utils.DirectoryInitialization
 import org.citra.citra_emu.utils.DocumentsTree
+import org.citra.citra_emu.utils.GraphicsUtil
 import org.citra.citra_emu.utils.Log
 import org.citra.citra_emu.utils.MemoryUtil
 import org.citra.citra_emu.utils.PermissionsHandler
@@ -68,6 +69,7 @@ class CitraApplication : Application() {
             Log.info("SoC Model - ${Build.SOC_MODEL}")
         }
         Log.info("Total System Memory - ${MemoryUtil.getDeviceRAM()}")
+        Log.info("OpenGL ES Renderer - ${GraphicsUtil.openGLRendererString}")
     }
 
     companion object {
diff --git a/src/android/app/src/main/java/org/citra/citra_emu/utils/GraphicsUtil.kt b/src/android/app/src/main/java/org/citra/citra_emu/utils/GraphicsUtil.kt
new file mode 100644
index 000000000..407182155
--- /dev/null
+++ b/src/android/app/src/main/java/org/citra/citra_emu/utils/GraphicsUtil.kt
@@ -0,0 +1,105 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+package org.citra.citra_emu.utils
+
+import android.opengl.EGL14
+import android.opengl.EGLConfig
+import android.opengl.GLES20
+
+object GraphicsUtil {
+    private const val UNKNOWN_RENDERER = "Unknown"
+
+    private lateinit var openGLRendererStringInternal: String
+
+    val openGLRendererString: String
+        @Synchronized
+        get() {
+            if (!::openGLRendererStringInternal.isInitialized) {
+                var result = UNKNOWN_RENDERER
+                val thread = Thread {
+                    result = retrieveOpenGLRendererString()
+                }
+                thread.start()
+                thread.join()
+                openGLRendererStringInternal = result
+            }
+            return openGLRendererStringInternal
+        }
+
+    @Suppress("SimplifyBooleanWithConstants")
+    private fun retrieveOpenGLRendererString(): String {
+        var result: Boolean
+
+        val glConfigAttribs = intArrayOf(
+            EGL14.EGL_SURFACE_TYPE,
+            EGL14.EGL_PBUFFER_BIT,
+            EGL14.EGL_RENDERABLE_TYPE,
+            EGL14.EGL_OPENGL_ES2_BIT,
+            EGL14.EGL_NONE
+        )
+        val glDisplay = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY)
+        if (glDisplay == EGL14.EGL_NO_DISPLAY) {
+            return UNKNOWN_RENDERER
+        }
+
+        result = EGL14.eglInitialize(glDisplay, null, 0, null, 1)
+        if (result == false) {
+            return UNKNOWN_RENDERER
+        }
+
+        val glConfigs = arrayOfNulls<EGLConfig>(1)
+        result =
+            EGL14.eglChooseConfig(glDisplay, glConfigAttribs, 0, glConfigs, 0, 1, IntArray(1), 0)
+        if (result == false) {
+            EGL14.eglTerminate(glDisplay)
+            return UNKNOWN_RENDERER
+        }
+
+        val glConfig = glConfigs[0]!!
+        val glContextAttribs = intArrayOf(EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE)
+        val glContext = EGL14.eglCreateContext(
+            glDisplay,
+            glConfig,
+            EGL14.EGL_NO_CONTEXT,
+            glContextAttribs,
+            0
+        )
+        if (glContext == EGL14.EGL_NO_CONTEXT) {
+            EGL14.eglTerminate(glDisplay)
+            return UNKNOWN_RENDERER
+        }
+
+        val glSurfaceAttribs = intArrayOf(
+            EGL14.EGL_WIDTH,
+            1,
+            EGL14.EGL_HEIGHT,
+            1,
+            EGL14.EGL_NONE
+        )
+        val glSurface = EGL14.eglCreatePbufferSurface(glDisplay, glConfig, glSurfaceAttribs, 0)
+
+        result = EGL14.eglMakeCurrent(glDisplay, glSurface, glSurface, glContext)
+        if (result == false) {
+            EGL14.eglDestroySurface(glDisplay, glSurface)
+            EGL14.eglDestroyContext(glDisplay, glContext)
+            EGL14.eglTerminate(glDisplay)
+            return UNKNOWN_RENDERER
+        }
+
+        val openGLRendererString = GLES20.glGetString(GLES20.GL_RENDERER) ?: UNKNOWN_RENDERER
+
+        EGL14.eglMakeCurrent(
+            glDisplay,
+            EGL14.EGL_NO_SURFACE,
+            EGL14.EGL_NO_SURFACE,
+            EGL14.EGL_NO_CONTEXT
+        )
+        EGL14.eglDestroySurface(glDisplay, glSurface)
+        EGL14.eglDestroyContext(glDisplay, glContext)
+        EGL14.eglTerminate(glDisplay)
+
+        return openGLRendererString
+    }
+}