From d9f723fbbff0fbe5ce8968007dc2bbf1d891ab2f Mon Sep 17 00:00:00 2001
From: knokko <knokogator@hotmail.com>
Date: Wed, 2 Feb 2022 21:04:35 +0100
Subject: [PATCH] EGL: Add glfwGetEGLConfig

---
 README.md                  |  1 +
 docs/news.dox              |  7 +++++++
 include/GLFW/glfw3native.h | 17 +++++++++++++++++
 src/egl_context.c          | 13 +++++++++++++
 4 files changed, 38 insertions(+)

diff --git a/README.md b/README.md
index fe222f27..8713fe65 100644
--- a/README.md
+++ b/README.md
@@ -303,6 +303,7 @@ information on what to include when reporting a bug.
  - [EGL] Added ANGLE backend selection via `EGL_ANGLE_platform_angle` extension
    (#1380)
  - [EGL] Bugfix: The `GLFW_DOUBLEBUFFER` context attribute was ignored (#1843)
+ - [EGL] Made it possible to query the `EGLConfig` that was chosen to create a given window via `glfwGetEGLConfig`
  - [GLX] Made it possible to query the `GLXFBConfig` that was chosen to create a given window via `glfwGetGLXFBConfig`
 
 
diff --git a/docs/news.dox b/docs/news.dox
index decd888d..3f4fdd05 100644
--- a/docs/news.dox
+++ b/docs/news.dox
@@ -77,6 +77,12 @@ GLFW now provides the [glfwGetGLXFBConfig](@ref glfwGetGLXFBConfig)
 function that returns the GLXFBConfig that was chosen to create the 
 given window handle.
 
+@subsubsection features_34_egl_getconfig Query EGLConfig
+
+GLFW now provides the [glfwGetEGLConfig](@ref glfwGetEGLConfig)
+function that returns the EGLConfig that was chosen to create the
+given window handle.
+
 
 @subsection caveats_34 Caveats for version 3.4
 @subsection caveats Caveats for version 3.4
@@ -185,6 +191,7 @@ then GLFW will fail to initialize.
 @subsubsection functions_34 New functions in version 3.4
 
  - @ref glfwGetGLXFBConfig
+ - @ref glfwGetEGLConfig
  - @ref glfwInitAllocator
  - @ref glfwGetPlatform
  - @ref glfwPlatformSupported
diff --git a/include/GLFW/glfw3native.h b/include/GLFW/glfw3native.h
index 334dabf0..f886e60b 100644
--- a/include/GLFW/glfw3native.h
+++ b/include/GLFW/glfw3native.h
@@ -532,6 +532,23 @@ GLFWAPI EGLContext glfwGetEGLContext(GLFWwindow* window);
  *  @ingroup native
  */
 GLFWAPI EGLSurface glfwGetEGLSurface(GLFWwindow* window);
+
+/*! @brief Returns the `EGLConfig` of the specified window.
+ *
+ *  @return The `EGLConfig` of the specified window, or `EGL_NO_SURFACE` if an
+ *  [error](@ref error_handling) occurred.
+ *
+ *  @errors Possible errors include @ref GLFW_NO_WINDOW_CONTEXT and @ref
+ *  GLFW_NOT_INITIALIZED.
+ *
+ *  @thread_safety This function may be called from any thread.  Access is not
+ *  synchronized.
+ *
+ *  @since Added in version 3.0.
+ *
+ *  @ingroup native
+ */
+GLFWAPI EGLConfig glfwGetEGLConfig(GLFWwindow* window);
 #endif
 
 #if defined(GLFW_EXPOSE_NATIVE_OSMESA)
diff --git a/src/egl_context.c b/src/egl_context.c
index 89ea78fa..502e488e 100644
--- a/src/egl_context.c
+++ b/src/egl_context.c
@@ -866,3 +866,16 @@ GLFWAPI EGLSurface glfwGetEGLSurface(GLFWwindow* handle)
     return window->context.egl.surface;
 }
 
+GLFWAPI EGLConfig glfwGetEGLConfig(GLFWwindow* handle)
+{
+    _GLFWwindow* window = (_GLFWwindow*) handle;
+    _GLFW_REQUIRE_INIT_OR_RETURN(EGL_NO_SURFACE);
+
+    if (window->context.source != GLFW_EGL_CONTEXT_API)
+    {
+        _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
+        return EGL_NO_SURFACE;
+    }
+
+    return window->context.egl.config;
+}