>From f08d6efbc85609d1384006b773ea0a3276eb1e67 Mon Sep 17 00:00:00 2001
From: =?utf-8?q?Nicolai=20H=C3=A4hnle?= <nhaeh...@gmail.com>
Date: Sat, 12 Sep 2009 16:49:31 +0200
Subject: [PATCH] mesa/st: Create front renderbuffer on the fly when supplied
with a surface
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Normally, the mesa/st would create a fake front buffer out of a
client-allocated surface.
In the DRI setting, however, st/dri provides a front buffer surface which is
created and maintained by the X server. Prefer to use this surface instead,
so that front buffer rendering and reading works correctly.
Signed-off-by: Nicolai Hähnle <nhaeh...@gmail.com>
---
src/mesa/state_tracker/st_framebuffer.c | 18 +++++++++++++++---
1 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/src/mesa/state_tracker/st_framebuffer.c
b/src/mesa/state_tracker/st_framebuffer.c
index ca32b2e..5c0d335 100644
--- a/src/mesa/state_tracker/st_framebuffer.c
+++ b/src/mesa/state_tracker/st_framebuffer.c
@@ -66,7 +66,7 @@ st_create_framebuffer( const __GLcontextModes *visual,
else {
/* Only allocate front buffer right now if we're single buffered.
* If double-buffered, allocate front buffer on demand later.
- * See check_create_front_buffers().
+ * See check_create_front_buffers() and
st_set_framebuffer_surface().
*/
struct gl_renderbuffer *rb
= st_new_renderbuffer_fb(colorFormat, samples, FALSE);
@@ -170,8 +170,20 @@ st_set_framebuffer_surface(struct st_framebuffer *stfb,
strb = st_renderbuffer(stfb->Base.Attachment[surfIndex].Renderbuffer);
- /* fail */
- if (!strb) return;
+ if (!strb) {
+ if (surfIndex == ST_SURFACE_FRONT_LEFT) {
+ /* Delayed creation when the window system supplies a fake front
buffer */
+ struct st_renderbuffer *strb_back
+ = st_renderbuffer(stfb-
>Base.Attachment[ST_SURFACE_BACK_LEFT].Renderbuffer);
+ struct gl_renderbuffer *rb
+ = st_new_renderbuffer_fb(surf->format, strb_back-
>Base.NumSamples, FALSE);
+ _mesa_add_renderbuffer(&stfb->Base, BUFFER_FRONT_LEFT, rb);
+ strb = st_renderbuffer(rb);
+ } else {
+ /* fail */
+ return;
+ }
+ }
/* replace the renderbuffer's surface/texture pointers */
pipe_surface_reference( &strb->surface, surf );
--
1.6.0.4
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