Bug 126538 - [WebGL] FBO Depth Buffer Attachment Function Improperly Clearing With 0
Summary: [WebGL] FBO Depth Buffer Attachment Function Improperly Clearing With 0
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebGL (show other bugs)
Version: 528+ (Nightly build)
Hardware: All All
: P2 Normal
Assignee: Brent Fulgham
URL:
Keywords: InRadar
: 81290 94300 122264 (view as bug list)
Depends on: 36248
Blocks:
  Show dependency tree / graph
 
Reported: 2014-01-06 14:03 PST by Brent Fulgham
Modified: 2014-04-08 16:17 PDT (History)
9 users (show)

See Also:

Attachments
Patch (1.58 KB, patch)
2014-01-06 14:08 PST, Brent Fulgham 		dino: review+
Details | Formatted Diff | Diff
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Description Brent Fulgham 2014-01-06 14:03:47 PST 
The problem was introduced in 2010 under https://bugs.webkit.org/show_bug.cgi?id=36248.

The depth buffer should be initialized to 1.0f (rather than 0.0f) to match expected initialization behavior.  The current logic was setting the depth buffer to 1.0, blocking all drawing operations, unless an explicit "gl.clear(gl.DEPTH_BUFFER_BIT)" was being done immediately after attaching the depth FBO.

Found by webgl/1.0.2/resources/webgl_test_files/conformance/renderbuffers/framebuffer-object-attachment.html
Comment 1 Brent Fulgham 2014-01-06 14:04:35 PST 
<rdar://problem/15201336>
Comment 2 Brent Fulgham 2014-01-06 14:08:38 PST 
Created attachment 220455 [details]
Patch
Comment 3 Brent Fulgham 2014-01-06 14:39:55 PST 
Committed r161375: <http://trac.webkit.org/changeset/161375>
Comment 4 Brent Fulgham 2014-01-07 09:15:35 PST 
*** Bug 81290 has been marked as a duplicate of this bug. ***
Comment 5 Brent Fulgham 2014-01-10 10:27:18 PST 
*** Bug 122264 has been marked as a duplicate of this bug. ***
Comment 6 Martin Robinson 2014-04-08 16:17:13 PDT 
*** Bug 94300 has been marked as a duplicate of this bug. ***