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<!--
/*
** Copyright (c) 2012 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;
attribute vec4 colorIn;
varying vec4 color;
void main()
{
color = colorIn;
gl_Position = vec4(pos.xyz, 1.0);
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 color;
void main()
{
gl_FragColor = color;
}
</script>
<script>
"use strict";
// These four declarations need to be global for "shouldBe" to see them
var wtu = WebGLTestUtils;
var gl;
var contextAttribs = null;
var redChannels = [0, 0, 0];
var correctColor = null;
var framebuffer;
var fbHasColor;
var fbHasDepth;
var fbHasStencil;
function init()
{
description('Verify WebGLContextAttributes are working as specified, including alpha, depth, stencil, antialias, but not premultipliedAlpha');
runTest();
}
function getWebGL(canvasWidth, canvasHeight, contextAttribs, clearColor, clearDepth, clearStencil)
{
var canvas = document.createElement("canvas");
if (!canvas)
return null;
canvas.width = canvasWidth;
canvas.height = canvasHeight;
gl = wtu.create3DContext(canvas, contextAttribs);
if (!gl)
return null;
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["pos", "colorIn"]);
if (!program)
return null;
gl.enable(gl.DEPTH_TEST);
gl.enable(gl.STENCIL_TEST);
gl.clearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
gl.clearDepth(clearDepth);
gl.clearStencil(clearStencil);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
framebuffer = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.canvas.width, gl.canvas.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
fbHasStencil = false;
fbHasDepth = false;
fbHasColor = gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE;
if (fbHasColor) {
var depthStencil = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, depthStencil);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_STENCIL, gl.canvas.width, gl.canvas.height);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, depthStencil);
fbHasDepth = gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE;
if (!fbHasDepth) {
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, null);
shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
} else {
fbHasStencil = true;
}
}
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
return gl;
}
function drawAndReadPixel(gl, vertices, colors)
{
var colorOffset = vertices.byteLength;
var vbo = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vbo);
gl.bufferData(gl.ARRAY_BUFFER, colorOffset + colors.byteLength, gl.STATIC_DRAW);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertices);
gl.bufferSubData(gl.ARRAY_BUFFER, colorOffset, colors);
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, colorOffset);
gl.enableVertexAttribArray(1);
gl.drawArrays(gl.TRIANGLES, 0, vertices.length / 3);
}
function testDefault()
{
debug("Testing default attributes: { stencil:false }");
shouldBeNonNull("gl = getWebGL(1, 1, null, [ 0, 0, 0, 0 ], 1, 0)");
shouldBeFalse("gl.getContextAttributes().stencil");
shouldBeTrue("gl.getParameter(gl.STENCIL_BITS) == 0");
}
function testAlpha(alpha)
{
debug("Testing alpha = " + alpha);
if (alpha) {
shouldBeNonNull("gl = getWebGL(1, 1, { alpha: true, depth: false, stencil: false, antialias: false }, [ 0, 0, 0, 0 ], 1, 0)");
shouldBeTrue("gl.getParameter(gl.ALPHA_BITS) >= 8");
} else {
shouldBeNonNull("gl = getWebGL(1, 1, { alpha: false, depth: false, stencil: false, antialias: false }, [ 0, 0, 0, 0 ], 1, 0)");
shouldBeTrue("gl.getParameter(gl.ALPHA_BITS) == 0");
}
shouldBeTrue("gl.getParameter(gl.RED_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.GREEN_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.BLUE_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.DEPTH_BITS) == 0");
shouldBeTrue("gl.getParameter(gl.STENCIL_BITS) == 0");
shouldBeNonNull("contextAttribs = gl.getContextAttributes()");
shouldBeTrue("contextAttribs.alpha == " + alpha);
var correctColor = (contextAttribs.alpha ? [0, 0, 0, 0] : [0, 0, 0, 255]);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, correctColor);
if (fbHasColor) {
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
gl.clearColor(0.5, 0.5, 0.5, 0.5);
gl.clear(gl.COLOR_BUFFER_BIT);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, [127, 127, 127, 127], undefined, 1);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
}
function testDepth(depth)
{
debug("Testing depth = " + depth);
if (depth) {
shouldBeNonNull("gl = getWebGL(1, 1, { stencil: false, antialias: false }, [ 0, 0, 0, 1 ], 1, 0)");
shouldBeTrue("gl.getParameter(gl.DEPTH_BITS) >= 16");
} else {
shouldBeNonNull("gl = getWebGL(1, 1, { depth: false, stencil: false, antialias: false }, [ 0, 0, 0, 1 ], 1, 0)");
shouldBeTrue("gl.getParameter(gl.DEPTH_BITS) == 0");
}
shouldBeTrue("gl.getParameter(gl.RED_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.GREEN_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.BLUE_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.ALPHA_BITS) >= 8");
shouldBeNonNull("contextAttribs = gl.getContextAttributes()");
gl.depthFunc(gl.NEVER);
var vertices = new Float32Array([
1.0, 1.0, 0.0,
-1.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, -1.0, 0.0]);
var colors = new Uint8Array([
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255]);
drawAndReadPixel(gl, vertices, colors, 0, 0);
correctColor = (contextAttribs.depth ? [0, 0, 0, 255] : [255, 0, 0, 255]);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, correctColor);
if (fbHasDepth) {
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
drawAndReadPixel(gl, vertices, colors, 0, 0);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 0, 0, 255]);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
}
function testStencilAndDepth(stencil, depth)
{
debug("Testing stencil = " + stencil + ", depth = " + depth);
var creationString =
"gl = getWebGL(1, 1, { depth: " + depth + ", stencil: " + stencil + ", antialias: false }, [ 0, 0, 0, 1 ], 1, 0)";
shouldBeNonNull(creationString);
shouldBeTrue("gl.getParameter(gl.RED_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.GREEN_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.BLUE_BITS) >= 8");
shouldBeTrue("gl.getParameter(gl.ALPHA_BITS) >= 8");
if (depth)
shouldBeTrue("gl.getParameter(gl.DEPTH_BITS) >= 16");
else
shouldBeTrue("gl.getParameter(gl.DEPTH_BITS) == 0");
if (stencil)
shouldBeTrue("gl.getParameter(gl.STENCIL_BITS) >= 8");
else
shouldBeTrue("gl.getParameter(gl.STENCIL_BITS) == 0");
shouldBeNonNull("contextAttribs = gl.getContextAttributes()");
if (!depth && contextAttribs.depth) {
testFailed("WebGL implementation provided a depth buffer when it should not have");
}
if (!contextAttribs.depth)
depth = false;
if (!stencil && contextAttribs.stencil) {
testFailed("WebGL implementation provided a stencil buffer when it should not have");
}
if (!contextAttribs.stencil)
stencil = false;
gl.depthFunc(gl.ALWAYS);
gl.stencilFunc(gl.NEVER, 1, 1);
gl.stencilOp(gl.KEEP, gl.KEEP, gl.KEEP);
var vertices = new Float32Array([
1.0, 1.0, 0.0,
-1.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
-1.0, -1.0, 0.0,
1.0, -1.0, 0.0]);
var colors = new Uint8Array([
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255]);
drawAndReadPixel(gl, vertices, colors, 0, 0);
correctColor = (stencil ? [0, 0, 0, 255] : [255, 0, 0, 255]);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, correctColor)
if (fbHasStencil) {
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
drawAndReadPixel(gl, vertices, colors, 0, 0);
wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 0, 0, 255]);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
}
function testAntialias(antialias)
{
debug("Testing antialias = " + antialias);
// Both the width and height of canvas are N.
// Note that "N = 2" doesn't work for some post processing AA per the discussion at https://github.com/KhronosGroup/WebGL/pull/1977.
var N = 3;
if (antialias)
shouldBeNonNull("gl = getWebGL(" + N + ", " + N + ", { depth: false, stencil: false, alpha: false, antialias: true }, [ 0, 0, 0, 1 ], 1, 0)");
else
shouldBeNonNull("gl = getWebGL(" + N + ", " + N + ", { depth: false, stencil: false, alpha: false, antialias: false }, [ 0, 0, 0, 1 ], 1, 0)");
shouldBeNonNull("contextAttribs = gl.getContextAttributes()");
var vertices = new Float32Array([
1.0, 1.0, 0.0,
-1.0, 1.0, 0.0,
-1.0, -1.0, 0.0]);
var colors = new Uint8Array([
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255]);
drawAndReadPixel(gl, vertices, colors, 0, 0);
var buf = new Uint8Array(N * N * 4);
gl.readPixels(0, 0, N, N, gl.RGBA, gl.UNSIGNED_BYTE, buf);
redChannels[0] = buf[4 * (N + 1)]; // (1, 1)
redChannels[1] = buf[4 * N * (N - 1)]; // left top
redChannels[2] = buf[4 * (N - 1)]; // right bottom
shouldBeTrue("redChannels[1] == 255 && redChannels[2] == 0");
shouldBe("redChannels[0] != 255 && redChannels[0] != 0", "contextAttribs.antialias");
}
function runTest()
{
testDefault();
testAlpha(true);
testAlpha(false);
testDepth(true);
testDepth(false);
testStencilAndDepth(true, false);
testStencilAndDepth(false, false);
testStencilAndDepth(true, true);
testStencilAndDepth(false, true);
testAntialias(true);
testAntialias(false);
finishTest();
}
</script>
</head>
<body onload="init()">
<div id="description"></div>
<div id="console"></div>
</body>
</html>
|
