dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/texture-active-bind.html

   1 <!--
   2 Copyright (c) 2019 The Khronos Group Inc.
   3 Use of this source code is governed by an MIT-style license that can be
   4 found in the LICENSE.txt file.
   5 -->
   6
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <title>WebGL ActiveTexture BindTexture conformance test.</title>
  12 <link rel="stylesheet" href="../../../resources/js-test-style.css"/>
  13 <script src="../../../js/js-test-pre.js"></script>
  14 <script src="../../../js/webgl-test-utils.js"></script>
  15 </head>
  16 <body>
  17 <canvas id="example" width="2" height="2" style="width: 40px; height: 40px;"></canvas>
  18 <canvas id="canvas2d" width="1" height="1" style="width: 40px; height: 40px;"></canvas>
  19 <div id="description"></div>
  20 <div id="console"></div>
  21 <script id="vshader" type="x-shader/x-vertex">
  22 uniform mat4 world;
  23 attribute vec3 vPosition;
  24 attribute vec2 texCoord0;
  25 varying vec2 texCoord;
  26 void main()
  27 {
  28   gl_Position = world * vec4(vPosition, 1);
  29   texCoord = texCoord0;
  30 }
  31 </script>
  32 <script id="trivial-vs" type="text/plain">
  33 void main()
  34 {
  35   gl_Position = vec4(0,0,0,1);
  36   gl_PointSize = 1.0;
  37 }
  38 </script>
  39 <script id="tex-point-fs" type="text/plain">
  40 precision mediump float;
  41 uniform sampler2D uSampler;
  42 void main()
  43 {
  44   gl_FragColor = texture2D(uSampler, vec2(0));
  45 }
  46 </script>
  47 <script>
  48 "use strict";
  49 var gl;
  50
  51 function init()
  52 {
  53   description(
  54       "Tests that glActiveTexture and glBindTexture work as expected" +
  55       "Specifically texture targets are per active texture unit.");
  56
  57   var canvas2d = document.getElementById("canvas2d");
  58   var ctx2d = canvas2d.getContext("2d");
  59
  60   var wtu = WebGLTestUtils;
  61   gl = wtu.create3DContext("example");
  62   var program = wtu.setupProgram(
  63       gl,
  64       ["vshader", wtu.simpleTextureFragmentShader],
  65       ['vPosition', 'texCoord0']);
  66   wtu.setupUnitQuad(gl);
  67   gl.disable(gl.DEPTH_TEST);
  68   gl.disable(gl.BLEND);
  69   wtu.glErrorShouldBe(gl, gl.NO_ERROR);
  70
  71   var colors = [
  72       [0,192,128,255],
  73       [128,64,255,255],
  74       [192,255,64,255],
  75       [200,0,255,255]];
  76
  77   // Make 4 textures by using 4 active texture units if available.
  78   var texunits = Math.min(colors.length, gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS))
  79   var textures = [];
  80   for (var ii = 0; ii < texunits; ++ii) {
  81     var tex = gl.createTexture();
  82     gl.activeTexture(gl.TEXTURE0 + ii);
  83     gl.bindTexture(gl.TEXTURE_2D, tex);
  84     textures[ii] = tex;
  85   }
  86   wtu.glErrorShouldBe(gl, gl.NO_ERROR);
  87
  88   // now use each texture unit to write into the textures,
  89   for (var ii = 0; ii < texunits; ++ii) {
  90     var c = colors[ii];
  91     ctx2d.fillStyle =
  92         "rgba(" + c[0] + "," + c[1] + "," + c[2] + "," + c[3] + ")";
  93     ctx2d.fillRect(0, 0, 1, 1);
  94     gl.activeTexture(gl.TEXTURE0 + ii);
  95     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas2d);
  96   }
  97   wtu.glErrorShouldBe(gl, gl.NO_ERROR);
  98
  99   var textureLoc = gl.getUniformLocation(program, "tex");
 100   var worldLoc = gl.getUniformLocation(program, "world");
 101   wtu.glErrorShouldBe(gl, gl.NO_ERROR);
 102
 103   gl.clearColor(1,0,0,1);
 104   gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
 105
 106   for (var ii = 0; ii < texunits; ++ii) {
 107     var x = ii % 2;
 108     var y = Math.floor(ii / 2);
 109     gl.uniform1i(textureLoc, ii);
 110     gl.uniformMatrix4fv(
 111         worldLoc, false,
 112         [0.5, 0, 0, 0,
 113          0, 0.5, 0, 0,
 114          0, 0, 1, 0,
 115          -0.5 + x, -0.5 + y, 0, 1]);
 116     gl.drawArrays(gl.TRIANGLES, 0, 6);
 117   }
 118   wtu.glErrorShouldBe(gl, gl.NO_ERROR);
 119
 120   for (var ii = 0; ii < texunits; ++ii) {
 121     var x = ii % 2;
 122     var y = Math.floor(ii / 2);
 123     wtu.checkCanvasRect(gl, x, y, 1, 1, colors[ii]);
 124   }
 125
 126   debug("");
 127   debug("Swizzle applied to correct ActiveTexture index");
 128
 129   {
 130     const prog = wtu.setupProgram(
 131         gl,
 132         ["trivial-vs", "tex-point-fs"]);
 133     prog.uSampler = gl.getUniformLocation(prog, "uSampler");
 134     gl.useProgram(prog);
 135     gl.viewport(0, 0, 1, 1);
 136     gl.activeTexture(gl.TEXTURE0);
 137     wtu.glErrorShouldBe(gl, gl.NO_ERROR);
 138
 139     const tex0_rgba8 = gl.createTexture();
 140     gl.bindTexture(gl.TEXTURE_2D, tex0_rgba8);
 141     const tex0_rgba8_data = new Uint8Array([10, 20, 30, 40]);
 142     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, tex0_rgba8_data);
 143
 144     const tex2_a8 = gl.createTexture();
 145     gl.bindTexture(gl.TEXTURE_2D, tex2_a8);
 146     gl.texImage2D(gl.TEXTURE_2D, 0, gl.ALPHA, 1, 1, 0, gl.ALPHA, gl.UNSIGNED_BYTE, null);
 147
 148     window.control = new Uint8Array(4);
 149     window.after_swizzle_applied = new Uint8Array(4);
 150
 151     gl.bindTexture(gl.TEXTURE_2D, tex0_rgba8);
 152     gl.drawArrays(gl.POINTS, 0, 1);
 153     gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, window.control);
 154     shouldBeString("window.control", tex0_rgba8_data.toString());
 155
 156     gl.activeTexture(gl.TEXTURE2);
 157     gl.bindTexture(gl.TEXTURE_2D, tex2_a8);
 158     gl.uniform1i(prog.uSampler, 2);
 159     gl.activeTexture(gl.TEXTURE0);
 160     gl.drawArrays(gl.POINTS, 0, 1);
 161     // Firefox would apply the A8-on-R8 swizzle to whatever tex-unit was active.
 162
 163     gl.uniform1i(prog.uSampler, 0);
 164     gl.drawArrays(gl.POINTS, 0, 1);
 165     gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, window.after_swizzle_applied);
 166     shouldBeString("window.after_swizzle_applied", tex0_rgba8_data.toString());
 167     // Firefox would then get 0,0,0,10 here, as the [ZERO,ZERO,ZERO,RED] swizzle was applied to our
 168     // 10,20,30,40 texture.
 169   }
 170 }
 171
 172 init();
 173 var successfullyParsed = true;
 174 </script>
 175 <script src="../../../js/js-test-post.js"></script>
 176
 177 </body>
 178 </html>
 179