intel: Fix initial MakeCurrent for single-buffer drawables

Commit 05da4a7a5e attempts to eliminate the
call to intel_update_renderbuffer() in the case where we already have a
drawbuffer for the drawable.  Unfortunately this only checks the
back left renderbuffer, which breaks in case of single buffer drawables.

This means that the initial viewport will not be set in that case.  Instead,
we now check whether the initial viewport has not been set, in which case
we call out to intel_update_renderbuffer().

https://bugs.freedesktop.org/show_bug.cgi?id=73862

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>

src/mesa/drivers/dri/i965/brw_context.c

@@ -918,7 +918,6 @@ intelMakeCurrent(__DRIcontext * driContextPriv,
    if (driContextPriv) {
       struct gl_context *ctx = &brw->ctx;
       struct gl_framebuffer *fb, *readFb;
-      struct intel_renderbuffer *rb = NULL;
 
       if (driDrawPriv == NULL && driReadPriv == NULL) {
          fb = _mesa_get_incomplete_framebuffer();
@@ -926,7 +925,6 @@ intelMakeCurrent(__DRIcontext * driContextPriv,
       } else {
          fb = driDrawPriv->driverPrivate;
          readFb = driReadPriv->driverPrivate;
-         rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
       }
@@ -938,11 +936,11 @@ intelMakeCurrent(__DRIcontext * driContextPriv,
       intel_gles3_srgb_workaround(brw, fb);
       intel_gles3_srgb_workaround(brw, readFb);
 
-      if (rb && !rb->mt) {
-         /* If we don't have buffers for the drawable yet, force a call to
-          * getbuffers here so we can have a default drawable size. */
+      /* If the context viewport hasn't been initialized, force a call out to
+       * the loader to get buffers so we have a drawable size for the initial
+       * viewport. */
+      if (!brw->ctx.ViewportInitialized)
          intel_prepare_render(brw);
-      }
 
       _mesa_make_current(ctx, fb, readFb);
    } else {