[Webkit-unassigned] [Bug 102215] WebGL: Avoid unnecessary format conversion for texImage2D by using GL extension

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102215





--- Comment #5 from Gregg Tavares <gman at chromium.org>  2013-01-22 21:06:04 PST ---
Has Ken pointed out this won't work.

First off it probably won't pass this test
https://www.khronos.org/registry/webgl/sdk/tests/conformance/textures/texture-formats-test.html

Secondly as Ken points out in ES 2.0 format and internal_format are required to match and being WebKit it's not just Chromium they are required to match on. They must also match on iOS, Android, etc...

Also, as Ken alluded to you can't do silent conversions as otherwise this won't work

    // set level 0
    gl.texImage2D(target, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, some4x4Image);  // silently uses BGRA

    // set level 1
    gl.texImage2D(target, 0, gl.RGBA, 2, 2, 0,  gl.RGBA, gl.UNSIGNED_BYTE,  myData);  // no conversion

At this point level 0 is BGRA and level 1 is RGBA and won't render.

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