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egl-winsys: Bind the framebuffer before swapping

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For some reason the EGL spec says that the surface passed to
eglSwapBuffers must be bound as the current surface for the swap to
work. Mesa validates that this is the case and returns an error from
the swap buffers call if not.

https://bugzilla.gnome.org/show_bug.cgi?id=665604

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts 2011-12-05 15:55:12 +00:00
parent d16131a09f
commit dba42715d4
1 changed files with 17 additions and 0 deletions
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17
cogl/winsys/cogl-winsys-egl.c
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@ -1538,6 +1538,14 @@ _cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
rect[1] = framebuffer_height - rect[1] - rect[3];
}
/* At least for eglSwapBuffers the EGL spec says that the surface to
swap must be bound to the current context. It looks like Mesa
also validates that this is the case for eglSwapBuffersRegion so
we must bind here too */
_cogl_framebuffer_flush_state (COGL_FRAMEBUFFER (onscreen),
COGL_FRAMEBUFFER (onscreen),
COGL_FRAMEBUFFER_STATE_BIND);
if (egl_renderer->pf_eglSwapBuffersRegion (egl_renderer->edpy,
egl_onscreen->egl_surface,
n_rectangles,
@ -1578,6 +1586,15 @@ _cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
&egl_onscreen->kms_onscreen);
return;
#else
/* The specification for EGL (at least in 1.4) says that the surface
needs to be bound to the current context for the swap to work
although it may change in future. Mesa explicitly checks for this
and just returns an error if this is not the case so we can't
just pretend this isn't in the spec. */
_cogl_framebuffer_flush_state (COGL_FRAMEBUFFER (onscreen),
COGL_FRAMEBUFFER (onscreen),
COGL_FRAMEBUFFER_STATE_BIND);
eglSwapBuffers (egl_renderer->edpy, egl_onscreen->egl_surface);
#endif