[Webkit-unassigned] [Bug 202438] New: Rendering to 1X1 framebuffer fails

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202438

            Bug ID: 202438
           Summary: Rendering to 1X1 framebuffer fails
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: akp.chandu at gmail.com
                CC: dino at apple.com

1. On an iOS device, launch Safari and go to https://bl.ocks.org/1chandu/58c2f58b95a1975120b373eb57bfea9a
2. Connect your device to mac and check the browser console (using mac Safari Developer menu), should see 'TEST PASSED' log.

Corresponding gist: https://gist.github.com/1chandu/58c2f58b95a1975120b373eb57bfea9a

I am creating a 1X1 (width and height equal 1) RGBA (UNSIGNED_BYTE) texture and rendering few GL.POINT primitives to render to same 1 pixel. Before rendering I clear it with (0, 0, 0) color and render (255, 255, 255) for all points. Then perform readPixels to verify the value of the single pixel color.

Expected: (255, 255, 255), instead I see (0, 0, 0)

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