927962 - WebGL conformance test error in conformance/canvas/drawingbuffer-test.html

Status: RESOLVED DUPLICATE of bug 847714

(Core :: Graphics: CanvasWebGL, defect)

Description

[Jukka Jylänki]

On my laptop with the specs

Windows 7 Home Premium 64-bit
Intel(R) Core(TM) i5-2557M CPU @ 1.70GHz (4 CPUs), ~1.7GHz
4096MB RAM
Intel(R) HD Graphics 3000
Intel(R) GPU driver version 9.17.10.2932
Intel(R) GPU driver date 12/14/2012 (up-to-date)

running https://www.khronos.org/registry/webgl/sdk/tests/conformance/canvas/drawingbuffer-test.html 
with both Firefox 24 stable and Firefox 27.0a1 Nightly (2013-10-17) gives output:

WebGL Canvas.drawingBufferWidth,drawingBufferHeight Conformance Tests

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

PASS context exists
PASS gl.drawingBufferWidth is gl.canvas.width
PASS gl.drawingBufferHeight is gl.canvas.height
MAX_VIEWPORT_DIMS: 8192, 8192
PASS maxSize[0] > 0 is true
PASS maxSize[1] > 0 is true

testing canvas width = 16, height = 32
PASS context exists
PASS gl.getParameter(gl.MAX_VIEWPORT_DIMS)[0] is maxSize[0]
PASS gl.getParameter(gl.MAX_VIEWPORT_DIMS)[1] is maxSize[1]
PASS gl.getParameter(gl.VIEWPORT)[0] is 0
PASS gl.getParameter(gl.VIEWPORT)[1] is 0
PASS gl.getParameter(gl.VIEWPORT)[2] is gl.drawingBufferWidth
PASS gl.getParameter(gl.VIEWPORT)[3] is gl.drawingBufferHeight

testing resizing canvas to width = 16, height = 32
PASS gl.getParameter(gl.VIEWPORT)[0] is oldViewport[0]
PASS gl.getParameter(gl.VIEWPORT)[1] is oldViewport[1]
PASS gl.getParameter(gl.VIEWPORT)[2] is oldViewport[2]
PASS gl.getParameter(gl.VIEWPORT)[3] is oldViewport[3]
PASS gl.getError() is gl.NO_ERROR

testing canvas width = 8224, height = 8
FAIL Unable to fetch WebGL rendering context for Canvas
FAIL context does not exist

PASS successfullyParsed is true

TEST COMPLETE

Comment 1

[guozhu cheng]

can I take this bug ?

Comment 2

[guozhu cheng]

this bug is caused by the implementation doesn't follow WebGL's spec currently 
[ http://www.khronos.org/registry/webgl/specs/latest/1.0/#2.2 ]
when we request a WebGL context with width or height larger than the system limit, it should be truncated to the nearest size rather
than just fail to create ( which is the behaviour now ).

Comment 3

[Kelsey Gilbert [:jgilbert]]

We already have a couple patches that solve this. I'll push one through.