[Webkit-unassigned] [Bug 111012] New: Refactor validation checks for texture uploads

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111012

           Summary: Refactor validation checks for texture uploads
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbr at google.com
                CC: dino at apple.com, cmarrin at apple.com, zmo at google.com,
                    gman at chromium.org, bajones at chromium.org,
                    jun.a.jiang at intel.com
        Depends on: 110931


Currently the validation checks performed during texture uploads in WebGL are scattered in many different places in the call stack. The majority of the checks occur in texImage2DBase and texSubImage2DBase, but some of the entry points which call these methods need to pack incoming data into a specified format. Therefore the format and type combination have to be verified as valid beforehand, leading to redundant checks in certain situations.

All of the necessary validation code should be refactored and called from the user-facing entry points before calling down further, and in particular, before calling any of the texture data conversion code. Then the checks performed in texImage2DBase and texSubImage2DBase will be unnecessary and can be turned into assertions.

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