[Webkit-unassigned] [Bug 56074] New: WebKit r80210 reports 16-bit depth precision on machines that support 24 bit depth

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=56074

           Summary: WebKit r80210 reports 16-bit depth precision on
                    machines that support 24 bit depth
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sheets at ashimaarts.com


Firefox 4 and Chrome 11 dev on this machine both report DEPTH_BITS of 24. WebKit reports DEPTH_BITS of 16. Technically this satisfies the spec but delivers a subpar user experience. I haven't been able to reproduce this behavior on an early 2009 Mac Pro, a late 2010 MacBook Air, or a late 2009 MBP. I've only seen this on this iMac (notably with ATI GPU).

Hardware Overview:

  Model Name:    iMac
  Model Identifier:    iMac11,3

ATI Radeon HD 5750:

  Chipset Model:    ATI Radeon HD 5750
  Type:    GPU
  Bus:    PCIe
  PCIe Lane Width:    x16
  VRAM (Total):    1024 MB
  Vendor:    ATI (0x1002)
  Device ID:    0x68a1
  Revision ID:    0x0000
  ROM Revision:    113-B9710C-238
  EFI Driver Version:    01.00.417
  Displays:
iMac:
  Resolution:    2560 x 1440
  Pixel Depth:    32-Bit Color (ARGB8888)
  Main Display:    Yes
  Mirror:    Off
  Online:    Yes
  Built-In:    Yes
  Connection Type:    DisplayPort

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