| <!-- |
| Copyright (c) 2019 The Khronos Group Inc. |
| Use of this source code is governed by an MIT-style license that can be |
| found in the LICENSE.txt file. |
| --> |
| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>WebGL More than 65536 indices.</title> |
| <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> |
| </head> |
| <body> |
| <canvas id="example" width="1" height="1" style="width: 40px; height: 40px;"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script id="vs" type="text/something-not-javascript"> |
| attribute vec4 vPosition; |
| attribute vec4 vColor; |
| varying vec4 color; |
| void main() { |
| gl_Position = vPosition; |
| gl_PointSize = 1.0; |
| color = vColor; |
| } |
| </script> |
| <script id="fs" type="text/something-not-javascript"> |
| precision mediump float; |
| varying vec4 color; |
| void main() { |
| gl_FragColor = color; |
| } |
| </script> |
| <script> |
| "use strict"; |
| description("checks that rendering with more than 65536 indices works."); |
| var wtu = WebGLTestUtils; |
| var gl = wtu.create3DContext("example"); |
| var program = wtu.setupProgram(gl, ["vs", "fs"], ["vPosition", "vColor"]); |
| var bufferObjects = wtu.setupUnitQuad(gl, 0, 1); |
| |
| gl.bindBuffer(gl.ARRAY_BUFFER, bufferObjects[0]); |
| gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ |
| -1, 1, |
| 1, 1, |
| -1, -1, |
| 1, -1, |
| -1, 1, |
| 1, 1, |
| -1, -1, |
| 1, -1]), gl.STATIC_DRAW); |
| gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0); |
| gl.bindBuffer(gl.ARRAY_BUFFER, bufferObjects[1]); |
| gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([ |
| 255, 0, 0, 255, |
| 255, 0, 0, 255, |
| 255, 0, 0, 255, |
| 255, 0, 0, 255, |
| 0, 255, 0, 255, |
| 0, 255, 0, 255, |
| 0, 255, 0, 255, |
| 0, 255, 0, 255]), gl.STATIC_DRAW); |
| gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, 0); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after program setup"); |
| |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture"); |
| var numQuads = Math.floor(65536 / 6) + 4; |
| var numPoints = numQuads * 6; |
| debug("numQuads: " + numQuads); |
| debug("numPoints: " + numPoints); |
| var indexBuf = new ArrayBuffer(numPoints); |
| var indices = new Uint8Array(indexBuf); |
| var indexBuffer = gl.createBuffer(); |
| gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices"); |
| |
| var modes = [ |
| {mode: 'POINTS', offsets: [0, 1, 2, 3, 2, 1], skip: 0}, |
| {mode: 'LINES', offsets: [0, 1, 2, 3, 2, 1], skip: 0}, |
| {mode: 'LINE_LOOP', offsets: [0, 1, 2, 3, 2, 1], skip: 1}, |
| {mode: 'LINE_STRIP', offsets: [0, 1, 2, 3, 2, 1], skip: 0}, |
| {mode: 'TRIANGLES', offsets: [0, 1, 2, 3, 2, 1], skip: 0}, |
| {mode: 'TRIANGLE_STRIP', offsets: [0, 1, 2, 3, 2, 1], skip: 0}, |
| {mode: 'TRIANGLE_FAN', offsets: [0, 1, 3, 2, 2, 1], skip: 1} |
| ]; |
| |
| for (var mm = 0; mm < modes.length; ++mm) { |
| var modeInfo = modes[mm]; |
| var mode = modeInfo.mode; |
| var offsets = modeInfo.offsets; |
| var skip = modeInfo.skip; |
| |
| for (var ii = 0; ii < numQuads; ++ii) { |
| var offset = ii * 6; |
| var quad = (ii == 0 || ii == (numQuads - 1)) ? 4 : 0; |
| for (var jj = 0; jj < 6; ++jj) { |
| indices[offset + jj] = quad + offsets[jj]; |
| } |
| } |
| gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW); |
| |
| debug(""); |
| debug("testing: " + mode); |
| // Draw without last 6 points. |
| gl.drawElements(gl[mode], numPoints - (skip + 1) * 6, gl.UNSIGNED_BYTE, skip * 6); |
| wtu.checkCanvas(gl, [255, 0, 0, 255], "Should be red."); |
| // Draw with last 6 points. |
| gl.drawElements(gl[mode], numPoints, gl.UNSIGNED_BYTE, 0); |
| wtu.checkCanvas(gl, [0, 255, 0, 255], "Should be green."); |
| } |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing"); |
| |
| var successfullyParsed = true; |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |
| |
| |