From: Kenneth Graunke <kenneth@whitecape.org>
Date: Tue, 6 Aug 2013 21:36:09 +0000 (-0700)
Subject: i965: Remember to call intel_prepare_render() before blitting.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fb3d62fe3d4fc40ba4ad9804d8b6f451316c9ae2;p=mesa.git

i965: Remember to call intel_prepare_render() before blitting.

Otherwise, blits to the window system buffer may cause crashes,
since dst_irb->mt may be NULL.

This code is lifted straight out of brw_blorp_framebuffer()'s
try_blorp_blit() helper.

Fixes crashes in Piglit's fbo-sys-blit on systems without BLORP.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65919
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <idr@freedesktop.org>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
Cc: "9.2" <mesa-stable@lists.freedesktop.org>
---

diff --git a/src/mesa/drivers/dri/i965/intel_fbo.c b/src/mesa/drivers/dri/i965/intel_fbo.c
index fb0bb71b028..1692325903b 100644
--- a/src/mesa/drivers/dri/i965/intel_fbo.c
+++ b/src/mesa/drivers/dri/i965/intel_fbo.c
@@ -695,6 +695,11 @@ intel_blit_framebuffer_with_blitter(struct gl_context *ctx,
 {
    struct brw_context *brw = brw_context(ctx);
 
+   /* Sync up the state of window system buffers.  We need to do this before
+    * we go looking for the buffers.
+    */
+   intel_prepare_render(brw);
+
    if (mask & GL_COLOR_BUFFER_BIT) {
       GLint i;
       const struct gl_framebuffer *drawFb = ctx->DrawBuffer;