Bug 126538

Summary: [WebGL] FBO Depth Buffer Attachment Function Improperly Clearing With 0
Product: WebKit Reporter: Brent Fulgham <bfulgham>
Component: WebGLAssignee: Brent Fulgham <bfulgham>
Status: RESOLVED FIXED    
Severity: Normal CC: bfulgham, commit-queue, dino, esprehn+autocc, gyuyoung.kim, kondapallykalyan, p.szymanski3, roger_fong, tomeu
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Bug Depends on: 36248    
Bug Blocks:    
Attachments:
Description Flags
Patch dino: review+

Brent Fulgham
Reported 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
Attachments
Patch (1.58 KB, patch)
2014-01-06 14:08 PST, Brent Fulgham 		dino: review+
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Brent Fulgham
Comment 1 2014-01-06 14:04:35 PST
<rdar://problem/15201336>
Brent Fulgham
Comment 2 2014-01-06 14:08:38 PST
Created attachment 220455 [details] Patch
Brent Fulgham
Comment 3 2014-01-06 14:39:55 PST
Committed r161375: <http://trac.webkit.org/changeset/161375>
Brent Fulgham
Comment 4 2014-01-07 09:15:35 PST
*** Bug 81290 has been marked as a duplicate of this bug. ***
Brent Fulgham
Comment 5 2014-01-10 10:27:18 PST
*** Bug 122264 has been marked as a duplicate of this bug. ***
Martin Robinson
Comment 6 2014-04-08 16:17:13 PDT
*** Bug 94300 has been marked as a duplicate of this bug. ***
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