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Diffstat (limited to 'dom/canvas/test/webgl-conf/checkout/conformance/rendering/polygon-offset.html')
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1 files changed, 192 insertions, 0 deletions
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/rendering/polygon-offset.html b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/polygon-offset.html new file mode 100644 index 000000000..fd49f6741 --- /dev/null +++ b/dom/canvas/test/webgl-conf/checkout/conformance/rendering/polygon-offset.html @@ -0,0 +1,192 @@ +<!-- + +/* +** Copyright (c) 2014 The Khronos Group Inc. +** +** Permission is hereby granted, free of charge, to any person obtaining a +** copy of this software and/or associated documentation files (the +** "Materials"), to deal in the Materials without restriction, including +** without limitation the rights to use, copy, modify, merge, publish, +** distribute, sublicense, and/or sell copies of the Materials, and to +** permit persons to whom the Materials are furnished to do so, subject to +** the following conditions: +** +** The above copyright notice and this permission notice shall be included +** in all copies or substantial portions of the Materials. +** +** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE +** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. +*/ + +--> + +<!DOCTYPE html> +<html> +<head> +<meta charset="utf-8"> +<link rel="stylesheet" href="../../resources/js-test-style.css"/> +<script src="../../js/js-test-pre.js"></script> +<script src="../../js/webgl-test-utils.js"></script> +<script id="vshader" type="x-shader/x-vertex"> +attribute vec3 pos; + +void main() +{ + gl_Position = vec4(pos, 1); +} +</script> + +<script id="fshader" type="x-shader/x-fragment"> +precision mediump float; +uniform vec4 col; + +void main() +{ + gl_FragColor = col; +} +</script> + +<script> +"use strict"; +var wtu = WebGLTestUtils; + +function draw(gl, arr, colLoc, col) +{ + var vertices = new Float32Array(arr); + var vertBuf = gl.createBuffer(); + gl.bindBuffer(gl.ARRAY_BUFFER, vertBuf); + gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW); + gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0); + gl.uniform4fv(colLoc, col); + gl.drawArrays(gl.TRIANGLE_STRIP, 0, vertices.length / 3); +} + +function clear(gl, col, z) +{ + gl.clearColor(col[0], col[1], col[2], col[3]); + gl.clearDepth(z); + gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); +} + +function check(gl) +{ + wtu.checkCanvasRect(gl, 0, 0, 16, 16, [0, 255, 0, 255], 'result should be green'); +} + +function runTest() +{ + var flatSquare = [-1, -1, 0, + -1, 1, 0, + 1, -1, 0, + 1, 1, 0]; + var slantedSquare = [-1, -1, -0.5, + -1, 1, -0.5, + 1, -1, 0.5, + 1, 1, 0.5]; + var red = [1, 0, 0, 1]; + var green = [0, 1, 0, 1]; + var blue = [0, 0, 1, 1]; + + var gl = wtu.create3DContext('testbed', { antialias: false }); + if (!gl) + { + testFailed('could not create context'); + return; + } + var program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['pos']); + var colLoc = gl.getUniformLocation(program, 'col'); + + gl.enableVertexAttribArray(0); + + gl.enable(gl.DEPTH_TEST); + gl.depthFunc(gl.LEQUAL); + + debug('Polygon offset fill should be off by default'); + clear(gl, red, 1.0); + draw(gl, slantedSquare, colLoc, blue); + draw(gl, slantedSquare, colLoc, green); + check(gl); + + debug('Polygon offset units should have no effect when fill is off'); + clear(gl, red, 1.0); + draw(gl, slantedSquare, colLoc, blue); + gl.polygonOffset(0, 10); + draw(gl, slantedSquare, colLoc, green); + check(gl); + + debug('Polygon offset factor should have no effect when fill is off'); + clear(gl, red, 1.0); + gl.polygonOffset(0, 0); + draw(gl, slantedSquare, colLoc, blue); + gl.polygonOffset(1.0, 0); + draw(gl, slantedSquare, colLoc, green); + check(gl); + + debug('Zero polygon offset units and factor should have no effect'); + clear(gl, red, 1.0); + gl.enable(gl.POLYGON_OFFSET_FILL); + gl.polygonOffset(0, 0); + draw(gl, slantedSquare, colLoc, blue); + draw(gl, slantedSquare, colLoc, green); + check(gl); + + // It appears to be VERY common for drivers to implement the units offset in + // floating-point arithmetic, which results in rount-to-nearest-even to cause + // an offset of 1 to sometimes not alter the order between these polygons. + debug('Polygon offset units of 2 should alter order of flat polygons'); + clear(gl, red, 1.0); + draw(gl, flatSquare, colLoc, green); + gl.polygonOffset(0, 2); + draw(gl, flatSquare, colLoc, blue); + check(gl); + + debug('Polygon offset factor of 0.1 should alter order of slanted polygons'); + clear(gl, red, 1.0); + draw(gl, slantedSquare, colLoc, green); + gl.polygonOffset(0.1, 0); + draw(gl, slantedSquare, colLoc, blue); + check(gl); + + debug('Polygon offset factor of 0.1 should not alter order of flat polygons'); + clear(gl, red, 1.0); + draw(gl, flatSquare, colLoc, blue); + gl.polygonOffset(0.1, 0); + draw(gl, flatSquare, colLoc, green); + check(gl); + + debug('Disabling polygon offset fill should leave order unaffected'); + clear(gl, red, 1.0); + gl.polygonOffset(0.1, 1); + gl.disable(gl.POLYGON_OFFSET_FILL); + draw(gl, slantedSquare, colLoc, blue); + draw(gl, slantedSquare, colLoc, green); + check(gl); + + debug('Enabling polygon offset fill should affect order again'); + clear(gl, red, 1.0); + draw(gl, slantedSquare, colLoc, green); + gl.enable(gl.POLYGON_OFFSET_FILL); + draw(gl, slantedSquare, colLoc, blue); + check(gl); +} +</script> +</head> +<body> +<canvas id="testbed" width="16" height="16" style="width:50px; height:50px"></canvas> +<div id="description"></div> +<div id="console"></div> +<script> +"use strict"; +description('Verify that polygon offset works'); +runTest(); +var successfullyParsed = true; +</script> +<script src="../../js/js-test-post.js"></script> + +</body> +</html> |