From 52f76844877d3e6f976db31923c07fb2c24c77a9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Camilla=20L=C3=B6wy?= <elmindreda@glfw.org>
Date: Thu, 8 Jun 2017 15:20:24 +0200
Subject: [PATCH] WGL: Add WGL_ARB_create_context_no_error support

---
 README.md         |  1 +
 src/wgl_context.c | 17 +++++++++++++++--
 src/wgl_context.h |  3 +++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 516c913b..3058a40a 100644
--- a/README.md
+++ b/README.md
@@ -200,6 +200,7 @@ information on what to include when reporting a bug.
 - [Cocoa] Bugfix: Full screen framebuffer was incorrectly sized for some video
                   modes (#682)
 - [WGL] Added support for `WGL_EXT_colorspace` for OpenGL ES contexts
+- [WGL] Added support for `WGL_ARB_create_context_no_error`
 - [EGL] Added support for `EGL_KHR_get_all_proc_addresses` (#871)
 - [EGL] Added support for `EGL_KHR_context_flush_control`
 - [EGL] Bugfix: The test for `EGL_RGB_BUFFER` was invalid
diff --git a/src/wgl_context.c b/src/wgl_context.c
index fc1b3970..92bd70e6 100644
--- a/src/wgl_context.c
+++ b/src/wgl_context.c
@@ -418,6 +418,8 @@ static void loadWGLExtensions(void)
         extensionSupportedWGL("WGL_EXT_create_context_es2_profile");
     _glfw.wgl.ARB_create_context_robustness =
         extensionSupportedWGL("WGL_ARB_create_context_robustness");
+    _glfw.wgl.ARB_create_context_no_error =
+        extensionSupportedWGL("WGL_ARB_create_context_no_error");
     _glfw.wgl.EXT_swap_control =
         extensionSupportedWGL("WGL_EXT_swap_control");
     _glfw.wgl.EXT_colorspace =
@@ -579,8 +581,6 @@ GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
 
         if (ctxconfig->debug)
             flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
-        if (ctxconfig->noerror)
-            flags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
 
         if (ctxconfig->robustness)
         {
@@ -618,6 +618,14 @@ GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
             }
         }
 
+        if (ctxconfig->noerror)
+        {
+            if (_glfw.wgl.ARB_create_context_no_error)
+            {
+                setWGLattrib(WGL_CONTEXT_OPENGL_NO_ERROR_ARB, GLFW_TRUE);
+            }
+        }
+
         // NOTE: Only request an explicitly versioned context when necessary, as
         //       explicitly requesting version 1.0 does not always return the
         //       highest version supported by the driver
@@ -664,6 +672,11 @@ GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
                 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
                                 "WGL: Driver does not support the requested OpenGL profile");
             }
+            else if (error == (0xc0070000 | ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB))
+            {
+                _glfwInputError(GLFW_INVALID_VALUE,
+                                "WGL: The share context is not compatible with the requested context");
+            }
             else
             {
                 if (ctxconfig->client == GLFW_OPENGL_API)
diff --git a/src/wgl_context.h b/src/wgl_context.h
index e02cc0ec..9fae9114 100644
--- a/src/wgl_context.h
+++ b/src/wgl_context.h
@@ -68,11 +68,13 @@
 #define WGL_CONTEXT_RELEASE_BEHAVIOR_ARB 0x2097
 #define WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB 0
 #define WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB 0x2098
+#define WGL_CONTEXT_OPENGL_NO_ERROR_ARB 0x31b3
 #define WGL_COLORSPACE_EXT 0x309d
 #define WGL_COLORSPACE_SRGB_EXT 0x3089
 
 #define ERROR_INVALID_VERSION_ARB 0x2095
 #define ERROR_INVALID_PROFILE_ARB 0x2096
+#define ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB 0x2054
 
 typedef BOOL (WINAPI * PFNWGLSWAPINTERVALEXTPROC)(int);
 typedef BOOL (WINAPI * PFNWGLGETPIXELFORMATATTRIBIVARBPROC)(HDC,int,int,UINT,const int*,int*);
@@ -142,6 +144,7 @@ typedef struct _GLFWlibraryWGL
     GLFWbool                            ARB_create_context_profile;
     GLFWbool                            EXT_create_context_es2_profile;
     GLFWbool                            ARB_create_context_robustness;
+    GLFWbool                            ARB_create_context_no_error;
     GLFWbool                            ARB_context_flush_control;
 
 } _GLFWlibraryWGL;