From fa55c2402c11aaccfc30b198b22b136142574a9c Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Fri, 21 Mar 2014 11:06:41 -0600
Subject: [PATCH] st/wgl: add debug code to check that pixel format
 initialization worked

If the assertion fails, it means something is really broken.  Before,
if this happened we reverted to the GDI renderer without any warning.

Reviewed-by: Matthew McClure <mcclurem@vmware.com>
---
 src/gallium/state_trackers/wgl/stw_pixelformat.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/gallium/state_trackers/wgl/stw_pixelformat.c b/src/gallium/state_trackers/wgl/stw_pixelformat.c
index dc5160d868e..96169e2b5f9 100644
--- a/src/gallium/state_trackers/wgl/stw_pixelformat.c
+++ b/src/gallium/state_trackers/wgl/stw_pixelformat.c
@@ -214,13 +214,14 @@ stw_pixelformat_add(
 /**
  * Add the depth/stencil/accum/ms variants for a particular color format.
  */
-static void
+static unsigned
 add_color_format_variants(const struct stw_pf_color_info *color,
                           boolean extended)
 {
    struct pipe_screen *screen = stw_dev->screen;
    unsigned ms, db, ds, acc;
    unsigned bind_flags = PIPE_BIND_RENDER_TARGET;
+   unsigned num_added = 0;
 
    if (!extended) {
       bind_flags |= PIPE_BIND_DISPLAY_TARGET;
@@ -228,7 +229,7 @@ add_color_format_variants(const struct stw_pf_color_info *color,
 
    if (!screen->is_format_supported(screen, color->format,
                                     PIPE_TEXTURE_2D, 0, bind_flags)) {
-      return;
+      return 0;
    }
 
    for (ms = 0; ms < Elements(stw_pf_multisample); ms++) {
@@ -253,10 +254,13 @@ add_color_format_variants(const struct stw_pf_color_info *color,
             for (acc = 0; acc < 2; acc++) {
                stw_pixelformat_add(stw_dev, extended, color, depth,
                                    acc * 16, doublebuffer, samples);
+               num_added++;
             }
          }
       }
    }
+
+   return num_added;
 }
 
 
@@ -264,14 +268,16 @@ void
 stw_pixelformat_init( void )
 {
    unsigned i;
+   unsigned num_formats = 0;
 
    assert( !stw_dev->pixelformat_count );
    assert( !stw_dev->pixelformat_extended_count );
 
    /* normal, displayable formats */
    for (i = 0; i < Elements(stw_pf_color); i++) {
-      add_color_format_variants(&stw_pf_color[i], FALSE);
+      num_formats += add_color_format_variants(&stw_pf_color[i], FALSE);
    }
+   assert(num_formats > 0);
 
    /* extended, pbuffer-only formats */
    for (i = 0; i < Elements(stw_pf_color_extended); i++) {