Merge d9f723fbbf into 97da62a027

README.md

@@ -304,6 +304,8 @@ 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`
 
 
 ## Contact

docs/news.dox

@@ -71,6 +71,20 @@ Alt-and-then-Space shortcuts.  This may be useful for more GUI-oriented
 applications.
 
 
+@subsubsection features_34_glx_getfbconfig Query GLXFBConfig
+
+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
 
 @subsubsection native_34 Multiple sets of native access functions
@@ -176,6 +190,8 @@ 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

include/GLFW/glfw3native.h

@@ -415,6 +415,21 @@ GLFWAPI GLXContext glfwGetGLXContext(GLFWwindow* window);
  *  @ingroup native
  */
 GLFWAPI GLXWindow glfwGetGLXWindow(GLFWwindow* window);
+
+/*! @brief Returns the `GLXFBConfig` that was chosen to create the 
+ *  specified window.
+ *
+ *  @return The `GLXFBConfig` that was chosen to create the specified 
+ *  window, or `NULL` if an [error](@ref error_handling) occurred.
+ *
+ *  @thread_safety This function may be called from any thread.  Access is not
+ *  synchronized.
+ *
+ *  @since Added in version 3.4
+ *
+ *  @ingroup native
+ */
+GLFWAPI GLXFBConfig glfwGetGLXFBConfig(GLFWwindow* window);
 #endif
 
 #if defined(GLFW_EXPOSE_NATIVE_WAYLAND)
@@ -517,6 +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)

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;
+}

src/glx_context.c

@@ -242,6 +242,11 @@ static void destroyContextGLX(_GLFWwindow* window)
         glXDestroyContext(_glfw.x11.display, window->context.glx.handle);
         window->context.glx.handle = NULL;
     }
+
+    if (window->context.glx.fbConfig)
+    {
+        window->context.glx.fbConfig = NULL;
+    }
 }
 
 
@@ -621,6 +626,8 @@ GLFWbool _glfwCreateContextGLX(_GLFWwindow* window,
         return GLFW_FALSE;
     }
 
+    window->context.glx.fbConfig = native;
+
     window->context.makeCurrent = makeContextCurrentGLX;
     window->context.swapBuffers = swapBuffersGLX;
     window->context.swapInterval = swapIntervalGLX;
@@ -710,3 +717,16 @@ GLFWAPI GLXWindow glfwGetGLXWindow(GLFWwindow* handle)
     return window->context.glx.window;
 }
 
+GLFWAPI GLXFBConfig glfwGetGLXFBConfig(GLFWwindow* handle)
+{
+    _GLFWwindow* window = (_GLFWwindow*) handle;
+    _GLFW_REQUIRE_INIT_OR_RETURN(None);
+
+    if (window->context.client == GLFW_NO_API)
+    {
+        _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
+        return NULL;
+    }
+
+    return window->context.glx.fbConfig;
+}

src/x11_platform.h

@@ -469,6 +469,7 @@ typedef struct _GLFWcontextGLX
 {
     GLXContext      handle;
     GLXWindow       window;
+    GLXFBConfig     fbConfig;
 } _GLFWcontextGLX;
 
 // GLX-specific global data