st/glx: implement glXCreateContextAttribsARB()

1 files changed, 95 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/glx/xlib/glx_api.c b/src/gallium/state_trackers/glx/xlib/glx_api.c
index eae9391..2bab020 100644
--- a/src/gallium/state_trackers/glx/xlib/glx_api.c
+++ b/src/gallium/state_trackers/glx/xlib/glx_api.c
@@ -2638,3 +2638,98 @@ glXReleaseTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer)
    if (b)
       XMesaReleaseTexImage(dpy, b, buffer);
 }
+
+
+
+/*** GLX_ARB_create_context ***/
+
+GLXContext
+glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config,
+                           GLXContext shareCtx, Bool direct,
+                           const int *attrib_list)
+{
+   XMesaVisual xmvis = (XMesaVisual) config;
+   int majorVersion = 1, minorVersion = 0;
+   int contextFlags = 0x0;
+   int profileMask = GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
+   int renderType = GLX_RGBA_TYPE;
+   unsigned i;
+   Bool done = False;
+   const int contextFlagsAll = (GLX_CONTEXT_DEBUG_BIT_ARB |
+                                GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
+
+   /* parse attrib_list */
+   for (i = 0; !done && attrib_list[i]; i++) {
+      switch (attrib_list[i]) {
+      case GLX_CONTEXT_MAJOR_VERSION_ARB:
+         majorVersion = attrib_list[++i];
+         break;
+      case GLX_CONTEXT_MINOR_VERSION_ARB:
+         minorVersion = attrib_list[++i];
+         break;
+      case GLX_CONTEXT_FLAGS_ARB:
+         contextFlags = attrib_list[++i];
+         break;
+      case GLX_CONTEXT_PROFILE_MASK_ARB:
+         profileMask = attrib_list[++i];
+         break;
+      case GLX_RENDER_TYPE:
+         renderType = attrib_list[++i];
+         break;
+      case 0:
+         /* end of list */
+         done = True;
+         break;
+      default:
+         /* bad attribute */
+         /* XXX generate BadValue X Error */
+         return NULL;
+      }
+   }
+
+   /* check contextFlags */
+   if (contextFlags & ~contextFlagsAll) {
+      return NULL; /* generate BadValue X Error */
+   }
+
+   /* check profileMask */
+   if (profileMask != GLX_CONTEXT_CORE_PROFILE_BIT_ARB &&
+       profileMask != GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB) {
+      return NULL; /* generate BadValue X Error */
+   }
+
+   /* check version (generate BadMatch if bad) */
+   switch (majorVersion) {
+   case 1:
+      if (minorVersion < 0 || minorVersion > 5)
+         return NULL;
+      break;
+   case 2:
+      if (minorVersion < 0 || minorVersion > 1)
+         return NULL;
+      break;
+   case 3:
+      if (minorVersion < 0 || minorVersion > 2)
+         return NULL;
+      break;
+   case 4:
+      if (minorVersion < 0 || minorVersion > 0)
+         return NULL;
+      break;
+   default:
+      return NULL;
+   }
+
+   if ((contextFlags & GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) &&
+       majorVersion < 3)
+      return NULL; /* generate GLXBadProfileARB */
+
+   if (renderType == GLX_COLOR_INDEX_TYPE && majorVersion >= 3)
+      return NULL; /* generate BadMatch */
+
+   return create_context(dpy, xmvis,
+                         shareCtx ? shareCtx->xmesaContext : NULL,
+                         direct,
+                         majorVersion, minorVersion,
+                         profileMask, contextFlags);
+}