glx/dri2: Add DRI2 support for GLX_MESA_query_renderer

The new functions for this extension were added to a separate file
(dri2_query_renderer.c) to facilitate unit testing.  I tried putting
them in dri2_glx.c, and it resulting in an unending chain of
dependencies.  It was the proverbial threading hanging from a sweater.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glx/Makefile.am

@@ -93,6 +93,7 @@ libglx_la_SOURCES = \
 	  glxhash.c \
 	  dri2_glx.c \
 	  dri2.c \
+	  dri2_query_renderer.c \
 	  applegl_glx.c
 
 GL_LIBS = \

src/glx/dri2.h

@@ -85,4 +85,12 @@ DRI2CopyRegion(Display * dpy, XID drawable,
                XserverRegion region,
                CARD32 dest, CARD32 src);
 
+_X_HIDDEN int
+dri2_query_renderer_integer(struct glx_screen *base, int attribute,
+                            unsigned int *value);
+
+_X_HIDDEN int
+dri2_query_renderer_string(struct glx_screen *base, int attribute,
+                           const char **value);
+
 #endif

src/glx/dri2_glx.c

@@ -1117,12 +1117,23 @@ dri2BindExtensions(struct dri2_screen *psc, struct glx_display * priv,
           && strcmp(extensions[i]->name, __DRI2_ROBUSTNESS) == 0)
          __glXEnableDirectExtension(&psc->base,
                                     "GLX_ARB_create_context_robustness");
+
+      /* DRI2 version 3 is also required because GLX_MESA_query_renderer
+       * requires GLX_ARB_create_context_profile.
+       */
+      if (psc->dri2->base.version >= 3
+          && strcmp(extensions[i]->name, __DRI2_RENDERER_QUERY) == 0) {
+         psc->rendererQuery = (__DRI2rendererQueryExtension *) extensions[i];
+         __glXEnableDirectExtension(&psc->base, "GLX_MESA_query_renderer");
+      }
    }
 }
 
 static const struct glx_screen_vtable dri2_screen_vtable = {
    dri2_create_context,
-   dri2_create_context_attribs
+   dri2_create_context_attribs,
+   dri2_query_renderer_integer,
+   dri2_query_renderer_string,
 };
 
 static struct glx_screen *

src/glx/dri2_priv.h

@@ -42,6 +42,7 @@ struct dri2_screen {
    const __DRI2configQueryExtension *config;
    const __DRItexBufferExtension *texBuffer;
    const __DRI2throttleExtension *throttle;
+   const __DRI2rendererQueryExtension *rendererQuery;
    const __DRIconfig **driver_configs;
 
    void *driver;

src/glx/dri2_query_renderer.c

@@ -0,0 +1,97 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * 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.
+ */
+#include "glxclient.h"
+#include "glx_error.h"
+#include "xf86drm.h"
+#include "dri2.h"
+#include "dri_interface.h"
+#include "dri2_priv.h"
+
+static int
+dri2_convert_glx_query_renderer_attribs(int attribute)
+{
+   switch (attribute) {
+   case GLX_RENDERER_VENDOR_ID_MESA:
+      return __DRI2_RENDERER_VENDOR_ID;
+   case GLX_RENDERER_DEVICE_ID_MESA:
+      return __DRI2_RENDERER_DEVICE_ID;
+   case GLX_RENDERER_VERSION_MESA:
+      return __DRI2_RENDERER_VERSION;
+   case GLX_RENDERER_ACCELERATED_MESA:
+      return __DRI2_RENDERER_ACCELERATED;
+   case GLX_RENDERER_VIDEO_MEMORY_MESA:
+      return __DRI2_RENDERER_VIDEO_MEMORY;
+   case GLX_RENDERER_UNIFIED_MEMORY_ARCHITECTURE_MESA:
+      return __DRI2_RENDERER_UNIFIED_MEMORY_ARCHITECTURE;
+   case GLX_RENDERER_PREFERRED_PROFILE_MESA:
+      return __DRI2_RENDERER_PREFERRED_PROFILE;
+   case GLX_RENDERER_OPENGL_CORE_PROFILE_VERSION_MESA:
+      return __DRI2_RENDERER_OPENGL_CORE_PROFILE_VERSION;
+   case GLX_RENDERER_OPENGL_COMPATIBILITY_PROFILE_VERSION_MESA:
+      return __DRI2_RENDERER_OPENGL_COMPATIBILITY_PROFILE_VERSION;
+   case GLX_RENDERER_OPENGL_ES_PROFILE_VERSION_MESA:
+      return __DRI2_RENDERER_OPENGL_ES_PROFILE_VERSION;
+   case GLX_RENDERER_OPENGL_ES2_PROFILE_VERSION_MESA:
+      return __DRI2_RENDERER_OPENGL_ES2_PROFILE_VERSION;
+   default:
+      return -1;
+   }
+}
+
+_X_HIDDEN int
+dri2_query_renderer_integer(struct glx_screen *base, int attribute,
+                            unsigned int *value)
+{
+   struct dri2_screen *const psc = (struct dri2_screen *) base;
+
+   /* Even though there are invalid values (and
+    * dri2_convert_glx_query_renderer_attribs may return -1), the higher level
+    * GLX code is required to perform the filtering.  Assume that we got a
+    * good value.
+    */
+   const int dri_attribute = dri2_convert_glx_query_renderer_attribs(attribute);
+
+   if (psc->rendererQuery == NULL)
+      return -1;
+
+   return psc->rendererQuery->queryInteger(psc->driScreen, dri_attribute,
+                                           value);
+}
+
+_X_HIDDEN int
+dri2_query_renderer_string(struct glx_screen *base, int attribute,
+                           const char **value)
+{
+   struct dri2_screen *const psc = (struct dri2_screen *) base;
+
+   /* Even though queryString only accepts a subset of the possible GLX
+    * queries, the higher level GLX code is required to perform the filtering.
+    * Assume that we got a good value.
+    */
+   const int dri_attribute = dri2_convert_glx_query_renderer_attribs(attribute);
+
+   if (psc->rendererQuery == NULL)
+      return -1;
+
+   return psc->rendererQuery->queryString(psc->driScreen, dri_attribute, value);
+}