99 lines
3.0 KiB
JavaScript
99 lines
3.0 KiB
JavaScript
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var MOBILE_DEVICES_REGEX = /Android|webOS|iPad|iPhone|iPod|BlackBerry|IEMobile|Opera Mini/i;
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function isMobileDevice () {
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return MOBILE_DEVICES_REGEX.test(navigator.userAgent);
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}
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function getFBstatus (gl) {
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const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
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switch (status) {
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case gl.FRAMEBUFFER_COMPLETE:
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return 'FRAMEBUFFER_COMPLETE';
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case gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
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return 'FRAMEBUFFER_INCOMPLETE_ATTACHMENT';
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case gl.FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
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return 'FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT';
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case gl.FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
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return 'FRAMEBUFFER_INCOMPLETE_DIMENSIONS';
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case gl.FRAMEBUFFER_UNSUPPORTED:
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return 'FRAMEBUFFER_UNSUPPORTED';
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case gl.FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
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return 'FRAMEBUFFER_INCOMPLETE_MULTISAMPLE';
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case gl.RENDERBUFFER_SAMPLES:
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return 'RENDERBUFFER_SAMPLES';
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default:
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return 'Unkown Framebuffer status';
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}
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}
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function getWebGLsupport (canvas) {
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var support = {
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webgl1: '?',
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OES_texture_float: '-',
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EXT_blend_minmax: '-',
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MAX_RENDERBUFFER_SIZE: '-',
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renderToFloat: '-',
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mobile: isMobileDevice(),
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userAgent: navigator.userAgent
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};
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var gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
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if (!gl) {
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support.webgl1 = false;
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return support;
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} else {
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support.webgl1 = true;
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}
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var OES_texture_float = gl.getExtension('OES_texture_float');
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support.OES_texture_float = !!OES_texture_float;
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var EXT_blend_minmax = gl.getExtension('EXT_blend_minmax');
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support.EXT_blend_minmax = !!EXT_blend_minmax;
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support.MAX_RENDERBUFFER_SIZE = gl.getParameter(gl.MAX_RENDERBUFFER_SIZE);
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var aux1x1FB = gl.createFramebuffer();
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var aux1x1TEX = gl.createTexture();
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gl.bindTexture(gl.TEXTURE_2D, aux1x1TEX);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA,
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1, 1, 0, gl.RGBA, gl.FLOAT,
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null);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.bindFramebuffer(gl.FRAMEBUFFER, aux1x1FB);
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gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, aux1x1TEX, 0);
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// Check FB completeness
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support.renderToFloat = getFBstatus(gl);
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return support;
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}
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module.exports = {
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getWebGLStats: function () {
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var testCanvas = document.createElement('canvas');
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var stats;
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testCanvas.style.position = 'absolute';
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testCanvas.style.top = '0';
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testCanvas.style.left = '0';
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testCanvas.style.zIndex = '-1';
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testCanvas.style.width = '1px';
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testCanvas.style.height = '1px';
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testCanvas.style.pointerEvents = 'none';
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document.body.appendChild(testCanvas);
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try {
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stats = getWebGLsupport(testCanvas);
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} catch (error) {
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stats = {
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error: error
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};
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}
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return stats;
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}
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};
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