direct-to-native-GL for GLX clients on Cygwin ("Windows-DRI")

Structurally, this is very similar to the existing Apple-DRI code, except I
have chosen to implement this using the __GLXDRIdisplay, etc. vtables (as
suggested originally in [1]), rather than a maze of ifdefs.  This also means
that LIBGL_ALWAYS_SOFTWARE and LIBGL_ALWAYS_INDIRECT work as expected.

[1] https://lists.freedesktop.org/archives/mesa-dev/2010-May/000756.html

This adds:

* the Windows-DRI extension protocol headers and the windowsdriproto.pc
file, for use in building the Windows-DRI extension for the X server

* a Windows-DRI extension helper client library

* a Windows-specific DRI implementation for GLX clients

The server is queried for Windows-DRI extension support on the screen before
using it (to detect the case where WGL is disabled or can't be activated).

The server is queried for fbconfigID to pixelformatindex mapping, which is
used to augment glx_config.

The server is queried for a native handle for the drawable (which is of a
different type for windows, pixmaps and pbuffers), which is used to augment
__GLXDRIdrawable.

Various GLX extensions are enabled depending on if the equivalent WGL
extension is available.

1 files changed, 152 insertions, 0 deletions

diff --git a/src/glx/windows/windowsdristr.h b/src/glx/windows/windowsdristr.h
new file mode 100644
index 00000000000..07ab2310c82
--- /dev/null
+++ b/src/glx/windows/windowsdristr.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright © 2014 Jon Turney
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef WINDOWSDRISTR_H
+#define WINDOWSDRISTR_H
+
+#include "windowsdriconst.h"
+
+#define WINDOWSDRINAME "Windows-DRI"
+
+#define WINDOWS_DRI_MAJOR_VERSION	1       /* current version numbers */
+#define WINDOWS_DRI_MINOR_VERSION	0
+#define WINDOWS_DRI_PATCH_VERSION	0
+
+typedef struct _WindowsDRIQueryVersion
+{
+   CARD8 reqType;               /* always DRIReqCode */
+   CARD8 driReqType;            /* always X_DRIQueryVersion */
+   CARD16 length B16;
+} xWindowsDRIQueryVersionReq;
+#define sz_xWindowsDRIQueryVersionReq	4
+
+typedef struct
+{
+   BYTE type;                   /* X_Reply */
+   BOOL pad1;
+   CARD16 sequenceNumber B16;
+   CARD32 length B32;
+   CARD16 majorVersion B16;     /* major version of DRI protocol */
+   CARD16 minorVersion B16;     /* minor version of DRI protocol */
+   CARD32 patchVersion B32;     /* patch version of DRI protocol */
+   CARD32 pad3 B32;
+   CARD32 pad4 B32;
+   CARD32 pad5 B32;
+   CARD32 pad6 B32;
+} xWindowsDRIQueryVersionReply;
+#define sz_xWindowsDRIQueryVersionReply	32
+
+typedef struct _WindowsDRIQueryDirectRenderingCapable
+{
+   CARD8 reqType;               /* always DRIReqCode */
+   CARD8 driReqType;            /* X_DRIQueryDirectRenderingCapable */
+   CARD16 length B16;
+   CARD32 screen B32;
+} xWindowsDRIQueryDirectRenderingCapableReq;
+#define sz_xWindowsDRIQueryDirectRenderingCapableReq	8
+
+typedef struct
+{
+   BYTE type;                   /* X_Reply */
+   BOOL pad1;
+   CARD16 sequenceNumber B16;
+   CARD32 length B32;
+   BOOL isCapable;
+   BOOL pad2;
+   BOOL pad3;
+   BOOL pad4;
+   CARD32 pad5 B32;
+   CARD32 pad6 B32;
+   CARD32 pad7 B32;
+   CARD32 pad8 B32;
+   CARD32 pad9 B32;
+} xWindowsDRIQueryDirectRenderingCapableReply;
+#define sz_xWindowsDRIQueryDirectRenderingCapableReply	32
+
+typedef struct _WindowsDRINotify
+{
+   BYTE type;                   /* always eventBase + event type */
+   BYTE kind;
+   CARD16 sequenceNumber B16;
+   CARD32 time B32;             /* time of change */
+   CARD32 pad1 B32;
+   CARD32 pad2 B32;
+   CARD32 pad3 B32;
+   CARD32 pad4 B32;
+   CARD32 pad5 B32;
+   CARD32 pad6 B32;
+} xWindowsDRINotifyEvent;
+#define sz_xWindowsDRINotifyEvent	32
+
+typedef struct _WindowsDRIQueryDrawable
+{
+   CARD8 reqType;               /* always DRIReqCode */
+   CARD8 driReqType;            /* always X_DRIQueryDrawable */
+   CARD16 length B16;
+   CARD32 screen B32;
+   CARD32 drawable B32;
+} xWindowsDRIQueryDrawableReq;
+#define sz_xWindowsDRIQueryDrawableReq 12
+
+typedef struct
+{
+   BYTE type;                   /* X_Reply */
+   BOOL pad1;
+   CARD16 sequenceNumber B16;
+   CARD32 length B32;
+   CARD32 drawable_type B32;
+   CARD32 handle B32;
+   CARD32 pad3 B32;
+   CARD32 pad4 B32;
+   CARD32 pad5 B32;
+   CARD32 pad6 B32;
+} xWindowsDRIQueryDrawableReply;
+#define sz_xWindowsDRIQueryDrawableReply 32
+
+typedef struct _WindowsDRIFBConfigToPixelFormat
+{
+   CARD8 reqType;               /* always DRIReqCode */
+   CARD8 driReqType;            /* always X_DRIFBConfigToPixelFormat */
+   CARD16 length B16;
+   CARD32 screen B32;
+   CARD32 fbConfigID B32;
+} xWindowsDRIFBConfigToPixelFormatReq;
+
+#define sz_xWindowsDRIFBConfigToPixelFormatReq 12
+
+typedef struct
+{
+   BYTE type;                   /* X_Reply */
+   BOOL pad1;
+   CARD16 sequenceNumber B16;
+   CARD32 length B32;
+   CARD32 pixelFormatIndex B32;
+   CARD32 pad2 B32;
+   CARD32 pad3 B32;
+   CARD32 pad4 B32;
+   CARD32 pad5 B32;
+   CARD32 pad6 B32;
+} xWindowsDRIFBConfigToPixelFormatReply;
+#define sz_xWindowsDRIFBConfigToPixelFormatReply 32
+
+#endif /* WINDOWSDRISTR_H */