From b93cf55f4ecd94f5e9d5dda49d9092e3b769d044 Mon Sep 17 00:00:00 2001
From: Brian <brian@poulsbo.localnet.net>
Date: Tue, 26 Feb 2008 14:26:40 -0700
Subject: gallium: fix zero-sized viewport bug

If st_create_framebuffer() is called with width=0, height=0 and the program
never called glViewport, the viewport wasn't properly initalized.  This fixes
that.
---
 src/mesa/state_tracker/st_framebuffer.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/mesa/state_tracker/st_framebuffer.c')

diff --git a/src/mesa/state_tracker/st_framebuffer.c b/src/mesa/state_tracker/st_framebuffer.c
index bca3fa5c383..47d47daf2a1 100644
--- a/src/mesa/state_tracker/st_framebuffer.c
+++ b/src/mesa/state_tracker/st_framebuffer.c
@@ -124,6 +124,17 @@ void st_resize_framebuffer( struct st_framebuffer *stfb,
    if (stfb->Base.Width != width || stfb->Base.Height != height) {
       GET_CURRENT_CONTEXT(ctx);
       if (ctx) {
+         if (stfb->InitWidth == 0 && stfb->InitHeight == 0) {
+            /* didn't have a valid size until now */
+            stfb->InitWidth = width;
+            stfb->InitHeight = height;
+            if (ctx->Viewport.Width <= 1) {
+               /* set context's initial viewport/scissor size */
+               _mesa_set_viewport(ctx, 0, 0, width, height);
+               _mesa_set_scissor(ctx, 0, 0, width, height);
+            }
+         }
+
          _mesa_resize_framebuffer(ctx, &stfb->Base, width, height);
 
          assert(stfb->Base.Width == width);
-- 
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