From 96d19e898acb56d8fc6e6febbc6498f67cdd66a0 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Thu, 24 Sep 2020 17:08:27 -0400
Subject: [PATCH] glx: Implement GLX_EXT_get_drawable_type

Trivial extension to let the client query whether this is a window
pixmap or pbuffer. Mostly for Mesa's convenience when setting up
drawable state, but plausibly useful for apps and middleware as well.

Upstream OpenGL Registry merge request:

https://github.com/KhronosGroup/OpenGL-Registry/pull/425
---
 glx/extension_string.c |  1 +
 glx/extension_string.h |  1 +
 glx/glxcmds.c          | 10 +++++++++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/glx/extension_string.c b/glx/extension_string.c
index d7e2c7242..a5b8c747e 100644
--- a/glx/extension_string.c
+++ b/glx/extension_string.c
@@ -86,6 +86,7 @@ static const struct extension_info known_glx_extensions[] = {
     { GLX(EXT_create_context_es2_profile), VER(0,0), N, },
     { GLX(EXT_fbconfig_packed_float),   VER(0,0), N, },
     { GLX(EXT_framebuffer_sRGB),        VER(0,0), N, },
+    { GLX(EXT_get_drawable_type),       VER(0,0), Y, },
     { GLX(EXT_import_context),          VER(0,0), N, },
     { GLX(EXT_libglvnd),                VER(0,0), N, },
     { GLX(EXT_no_config_context),       VER(0,0), N, },
diff --git a/glx/extension_string.h b/glx/extension_string.h
index eab385a3c..5c8f981d9 100644
--- a/glx/extension_string.h
+++ b/glx/extension_string.h
@@ -47,6 +47,7 @@ enum {
     EXT_create_context_es_profile_bit,
     EXT_create_context_es2_profile_bit,
     EXT_fbconfig_packed_float_bit,
+    EXT_get_drawable_type_bit,
     EXT_import_context_bit,
     EXT_libglvnd_bit,
     EXT_no_config_context_bit,
diff --git a/glx/glxcmds.c b/glx/glxcmds.c
index c29b62676..98ddc7e5e 100644
--- a/glx/glxcmds.c
+++ b/glx/glxcmds.c
@@ -1860,7 +1860,7 @@ DoGetDrawableAttributes(__GLXclientState * cl, XID drawId)
     xGLXGetDrawableAttributesReply reply;
     __GLXdrawable *pGlxDraw = NULL;
     DrawablePtr pDraw;
-    CARD32 attributes[18];
+    CARD32 attributes[20];
     int num = 0, error;
 
     if (!validGlxDrawable(client, drawId, GLX_DRAWABLE_ANY,
@@ -1897,6 +1897,14 @@ DoGetDrawableAttributes(__GLXclientState * cl, XID drawId)
             ATTRIB(GLX_STEREO_TREE_EXT, 0);
         }
     }
+
+    /* GLX_EXT_get_drawable_type */
+    if (!pGlxDraw || pGlxDraw->type == GLX_DRAWABLE_WINDOW)
+        ATTRIB(GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT);
+    else if (pGlxDraw->type == GLX_DRAWABLE_PIXMAP)
+        ATTRIB(GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT);
+    else if (pGlxDraw->type == GLX_DRAWABLE_PBUFFER)
+        ATTRIB(GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT);
 #undef ATTRIB
 
     reply = (xGLXGetDrawableAttributesReply) {