[Mesa-dev] [PATCH] i965: Set a proper _BaseFormat for window system renderbuffers in ES.

[Kenneth Graunke]

intel_alloc_private_renderbuffer_storage did:

   rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);

Unfortunately, internalFormat was usually an unsized format (such as
GL_DEPTH_COMPONENT).  In OpenGL ES, _mesa_base_fbo_format() refuses to
accept unsized formats, and returns 0 rather than a real base format.

This meant that we ended up with a completely bogus rb->_BaseFormat for
window system buffers on OpenGL ES.  All other renderbuffer allocation
functions in intel_fbo.c instead use the mesa_format, and do:

   rb->_BaseFormat = _mesa_get_format_base_format(...);

We can do likewise, using rb->Format.  This appears to work just fine.

dEQP-GLES3.functional.state_query.fbo.framebuffer_attachment_x_size_initial
failed, as it tried to perform a GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE query
on the window system depth buffer.  That query relies on a proper
rb->_BaseFormat being set, so it broke because rb->_BaseFormat was 0 due
to the above bug.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94458
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/intel_fbo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/intel_fbo.c b/src/mesa/drivers/dri/i965/intel_fbo.c
index 3a4a53a..b7b6796 100644
--- a/src/mesa/drivers/dri/i965/intel_fbo.c
+++ b/src/mesa/drivers/dri/i965/intel_fbo.c
@@ -289,7 +289,7 @@ intel_alloc_private_renderbuffer_storage(struct gl_context * ctx, struct gl_rend
    rb->NumSamples = intel_quantize_num_samples(screen, rb->NumSamples);
    rb->Width = width;
    rb->Height = height;
-   rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
+   rb->_BaseFormat = _mesa_get_format_base_format(rb->Format);
 
    intel_miptree_release(&irb->mt);
 
-- 
2.7.2