1 files changed, 172 insertions, 0 deletions
diff --git a/third_party/libepoxy/libepoxy/src/dispatch_glx.c b/third_party/libepoxy/libepoxy/src/dispatch_glx.c
new file mode 100644
index 0000000000..e3955644d7
--- /dev/null
+++ b/third_party/libepoxy/libepoxy/src/dispatch_glx.c
@@ -0,0 +1,172 @@
+/*
+ * 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 <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "dispatch_common.h"
+
+/**
+ * If we can determine the GLX version from the current context, then
+ * return that, otherwise return a version that will just send us on
+ * to dlsym() or get_proc_address().
+ */
+int
+epoxy_conservative_glx_version(void)
+{
+    Display *dpy = glXGetCurrentDisplay();
+    GLXContext ctx = glXGetCurrentContext();
+    int screen;
+
+    if (!dpy || !ctx)
+        return 14;
+
+    glXQueryContext(dpy, ctx, GLX_SCREEN, &screen);
+
+    return epoxy_glx_version(dpy, screen);
+}
+
+
+/**
+ * @brief Returns the version of GLX we are using
+ *
+ * The version is encoded as:
+ *
+ * ```
+ *
+ *   version = major * 10 + minor
+ *
+ * ```
+ *
+ * So it can be easily used for version comparisons.
+ *
+ * @param dpy The X11 display
+ * @param screen The X11 screen
+ *
+ * @return The encoded version of GLX we are using
+ *
+ * @see epoxy_gl_version()
+ */
+int
+epoxy_glx_version(Display *dpy, int screen)
+{
+    int server_major, server_minor;
+    int client_major, client_minor;
+    int server, client;
+    const char *version_string;
+    int ret;
+
+    version_string = glXQueryServerString(dpy, screen, GLX_VERSION);
+    if (!version_string)
+        return 0;
+
+    ret = sscanf(version_string, "%d.%d", &server_major, &server_minor);
+    assert(ret == 2);
+    server = server_major * 10 + server_minor;
+
+    version_string = glXGetClientString(dpy, GLX_VERSION);
+    if (!version_string)
+        return 0;
+
+    ret = sscanf(version_string, "%d.%d", &client_major, &client_minor);
+    assert(ret == 2);
+    client = client_major * 10 + client_minor;
+
+    if (client < server)
+        return client;
+    else
+        return server;
+}
+
+/**
+ * If we can determine the GLX extension support from the current
+ * context, then return that, otherwise give the answer that will just
+ * send us on to get_proc_address().
+ */
+bool
+epoxy_conservative_has_glx_extension(const char *ext)
+{
+    Display *dpy = glXGetCurrentDisplay();
+    GLXContext ctx = glXGetCurrentContext();
+    int screen;
+
+    if (!dpy || !ctx)
+        return true;
+
+    glXQueryContext(dpy, ctx, GLX_SCREEN, &screen);
+
+    return epoxy_has_glx_extension(dpy, screen, ext);
+}
+
+/**
+ * @brief Returns true if the given GLX extension is supported in the current context.
+ *
+ * @param dpy The X11 display
+ * @param screen The X11 screen
+ * @param extension The name of the GLX extension
+ *
+ * @return `true` if the extension is available
+ *
+ * @see epoxy_has_gl_extension()
+ * @see epoxy_has_egl_extension()
+ */
+bool
+epoxy_has_glx_extension(Display *dpy, int screen, const char *ext)
+{
+    /* No, you can't just use glXGetClientString or
+     * glXGetServerString() here.  Those each tell you about one half
+     * of what's needed for an extension to be supported, and
+     * glXQueryExtensionsString() is what gives you the intersection
+     * of the two.
+     */
+    return epoxy_extension_in_string(glXQueryExtensionsString(dpy, screen), ext);
+}
+
+/**
+ * @brief Checks whether GLX is available.
+ *
+ * @param dpy The X11 display
+ *
+ * @return `true` if GLX is available
+ *
+ * @newin{1,4}
+ */
+bool
+epoxy_has_glx(Display *dpy)
+{
+#if !PLATFORM_HAS_GLX
+    return false;
+#else
+    if (epoxy_load_glx(false, true)) {
+        Bool (* pf_glXQueryExtension) (Display *, int *, int *);
+        int error_base, event_base;
+
+        pf_glXQueryExtension = epoxy_conservative_glx_dlsym("glXQueryExtension", false);
+        if (pf_glXQueryExtension && pf_glXQueryExtension(dpy, &error_base, &event_base))
+            return true;
+    }
+
+    return false;
+#endif /* !PLATFORM_HAS_GLX */
+}