From 731ff91acd7c52abe74bcde0f333f1c11c16f3db Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Camilla=20L=C3=B6wy?= <elmindreda@glfw.org>
Date: Wed, 10 May 2017 17:24:40 +0200
Subject: [PATCH] WGL: Add support for WGL_EXT_colorspace

---
 README.md         |  1 +
 src/wgl_context.c | 32 +++++++++++++++++++++++++-------
 src/wgl_context.h |  3 +++
 3 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index d6aed688..4df6f2b7 100644
--- a/README.md
+++ b/README.md
@@ -195,6 +195,7 @@ information on what to include when reporting a bug.
 - [Cocoa] Bugfix: Value range was ignored for joystick hats and buttons (#888)
 - [Cocoa] Bugfix: Full screen framebuffer was incorrectly sized for some video
                   modes (#682)
+- [WGL] Added support for `WGL_EXT_colorspace` for OpenGL ES contexts
 - [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 c59997fc..ff1d2d4e 100644
--- a/src/wgl_context.c
+++ b/src/wgl_context.c
@@ -54,7 +54,9 @@ static int getPixelFormatAttrib(_GLFWwindow* window, int pixelFormat, int attrib
 
 // Return a list of available and usable framebuffer configs
 //
-static int choosePixelFormat(_GLFWwindow* window, const _GLFWfbconfig* desired)
+static int choosePixelFormat(_GLFWwindow* window,
+                             const _GLFWctxconfig* ctxconfig,
+                             const _GLFWfbconfig* fbconfig)
 {
     _GLFWfbconfig* usableConfigs;
     const _GLFWfbconfig* closest;
@@ -127,11 +129,25 @@ static int choosePixelFormat(_GLFWwindow* window, const _GLFWfbconfig* desired)
             if (_glfw.wgl.ARB_multisample)
                 u->samples = getPixelFormatAttrib(window, n, WGL_SAMPLES_ARB);
 
-            if (_glfw.wgl.ARB_framebuffer_sRGB ||
-                _glfw.wgl.EXT_framebuffer_sRGB)
+            if (ctxconfig->client == GLFW_OPENGL_API)
             {
-                if (getPixelFormatAttrib(window, n, WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
-                    u->sRGB = GLFW_TRUE;
+                if (_glfw.wgl.ARB_framebuffer_sRGB ||
+                    _glfw.wgl.EXT_framebuffer_sRGB)
+                {
+                    if (getPixelFormatAttrib(window, n, WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
+                        u->sRGB = GLFW_TRUE;
+                }
+            }
+            else
+            {
+                if (_glfw.wgl.EXT_colorspace)
+                {
+                    if (getPixelFormatAttrib(window, n, WGL_COLORSPACE_EXT) ==
+                        WGL_COLORSPACE_SRGB_EXT)
+                    {
+                        u->sRGB = GLFW_TRUE;
+                    }
+                }
             }
         }
         else
@@ -197,7 +213,7 @@ static int choosePixelFormat(_GLFWwindow* window, const _GLFWfbconfig* desired)
         return 0;
     }
 
-    closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
+    closest = _glfwChooseFBConfig(fbconfig, usableConfigs, usableCount);
     if (!closest)
     {
         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
@@ -404,6 +420,8 @@ static void loadWGLExtensions(void)
         extensionSupportedWGL("WGL_ARB_create_context_robustness");
     _glfw.wgl.EXT_swap_control =
         extensionSupportedWGL("WGL_EXT_swap_control");
+    _glfw.wgl.EXT_colorspace =
+        extensionSupportedWGL("WGL_EXT_colorspace");
     _glfw.wgl.ARB_pixel_format =
         extensionSupportedWGL("WGL_ARB_pixel_format");
     _glfw.wgl.ARB_context_flush_control =
@@ -489,7 +507,7 @@ GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
         return GLFW_FALSE;
     }
 
-    pixelFormat = choosePixelFormat(window, fbconfig);
+    pixelFormat = choosePixelFormat(window, ctxconfig, fbconfig);
     if (!pixelFormat)
         return GLFW_FALSE;
 
diff --git a/src/wgl_context.h b/src/wgl_context.h
index e3a7e372..3b7f0247 100644
--- a/src/wgl_context.h
+++ b/src/wgl_context.h
@@ -72,6 +72,8 @@
 #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_COLORSPACE_EXT 0x309d
+#define WGL_COLORSPACE_SRGB_EXT 0x3089
 
 #define ERROR_INVALID_VERSION_ARB 0x2095
 #define ERROR_INVALID_PROFILE_ARB 0x2096
@@ -135,6 +137,7 @@ typedef struct _GLFWlibraryWGL
     PFNWGLGETEXTENSIONSSTRINGARBPROC    GetExtensionsStringARB;
     PFNWGLCREATECONTEXTATTRIBSARBPROC   CreateContextAttribsARB;
     GLFWbool                            EXT_swap_control;
+    GLFWbool                            EXT_colorspace;
     GLFWbool                            ARB_multisample;
     GLFWbool                            ARB_framebuffer_sRGB;
     GLFWbool                            EXT_framebuffer_sRGB;