third_party/WebKit/LayoutTests/fast/canvas/webgl/gl-bind-attrib-location-test.html

   1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   2   "http://www.w3.org/TR/html4/loose.dtd">
   3 <html>
   4 <head>
   5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
   6 <title>WebGL BindAttribLocation Conformance Tests</title>
   7 <script src="../../../resources/js-test.js"></script>
   8 <script src="resources/webgl-test.js"></script>
   9 </head>
  10 <body>
  11 <div id="description"></div>
  12 <div id="console"></div>
  13 <canvas style="border: 1px solid black;" id="canvas" width="50" height="50"></canvas>
  14 <script id="vshader" type="text/something-not-javascript">
  15 attribute vec4 vPosition;
  16 attribute vec4 vColor;
  17 varying vec4 color;
  18 void main()
  19 {
  20   gl_Position = vPosition;
  21   color = vColor;
  22 }
  23 </script>
  24 <script id="fshader" type="text/something-not-javascript">
  25 #ifdef GL_ES
  26 precision highp float;
  27 #endif
  28 varying vec4 color;
  29 void main()
  30 {
  31   gl_FragColor = color;
  32 }
  33 </script>
  34 <script>
  35 description("This test ensures WebGL implementations don't allow names that start with 'gl_' when calling bindAttribLocation.");
  36
  37 if (window.internals)
  38     window.internals.settings.setWebGLErrorsToConsoleEnabled(false);
  39
  40 debug("");
  41 debug("Canvas.getContext");
  42
  43 var gl = create3DContext(document.getElementById("canvas"));
  44 shouldBeNonNull(gl);
  45
  46 function fail(x,y, buf, shouldBe)
  47 {
  48   var i = (y*50+x) * 4;
  49   var reason = "pixel at ("+x+","+y+") is ("+buf[i]+","+buf[i+1]+","+buf[i+2]+","+buf[i+3]+"), should be "+shouldBe;
  50   testFailed(reason);
  51 }
  52
  53 function pass()
  54 {
  55   testPassed("drawing is correct");
  56 }
  57
  58 function loadShader(shaderType, shaderId) {
  59   // Get the shader source.
  60   var shaderSource = document.getElementById(shaderId).text;
  61
  62   // Create the shader object
  63   var shader = gl.createShader(shaderType);
  64   if (shader == null) {
  65     debug("*** Error: unable to create shader '"+shaderId+"'");
  66     return null;
  67   }
  68
  69   // Load the shader source
  70   gl.shaderSource(shader, shaderSource);
  71
  72   // Compile the shader
  73   gl.compileShader(shader);
  74
  75   // Check the compile status
  76   var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
  77   if (!compiled) {
  78     // Something went wrong during compilation; get the error
  79     var error = gl.getShaderInfoLog(shader);
  80     debug("*** Error compiling shader '"+shader+"':"+error);
  81     gl.deleteShader(shader);
  82     return null;
  83   }
  84   return shader;
  85 }
  86
  87 debug("");
  88 debug("Checking gl.bindAttribLocation.");
  89
  90 var program = gl.createProgram();
  91 gl.bindAttribLocation(program, 0, "gl_foo");
  92 glErrorShouldBe(gl, gl.INVALID_OPERATION,
  93     "bindAttribLocation should return INVALID_OPERATION if name starts with 'gl_'");
  94 gl.bindAttribLocation(program, 0, "gl_TexCoord0");
  95 glErrorShouldBe(gl, gl.INVALID_OPERATION,
  96     "bindAttribLocation should return INVALID_OPERATION if name starts with 'gl_'");
  97
  98 var vs = loadShader(gl.VERTEX_SHADER, "vshader");
  99 var fs = loadShader(gl.FRAGMENT_SHADER, "fshader");
 100 gl.attachShader(program, vs);
 101 gl.attachShader(program, fs);
 102
 103 var positions = gl.createBuffer();
 104 gl.bindBuffer(gl.ARRAY_BUFFER, positions);
 105 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
 106
 107 var colors = gl.createBuffer();
 108 gl.bindBuffer(gl.ARRAY_BUFFER, colors);
 109 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
 110     0,1,0,1,
 111     0,1,0,1,
 112     0,1,0,1]), gl.STATIC_DRAW);
 113
 114 function setBindLocations(colorLocation, positionLocation) {
 115   gl.bindAttribLocation(program, positionLocation, "vPosition");
 116   gl.bindAttribLocation(program, colorLocation, "vColor");
 117   gl.linkProgram(program);
 118   gl.useProgram(program);
 119   var linked = (gl.getProgramParameter(program, gl.LINK_STATUS) != 0);
 120   assertMsg(linked, "program linked successfully");
 121
 122   debug("vPosition:" + gl.getAttribLocation(program, "vPosition"))
 123   debug("vColor   :" + gl.getAttribLocation(program, "vColor"))
 124   assertMsg(gl.getAttribLocation(program, "vPosition") == positionLocation,
 125             "location of vPositon should be " + positionLocation);
 126   assertMsg(gl.getAttribLocation(program, "vColor") == colorLocation,
 127             "location of vColor should be " + colorLocation);
 128
 129   var ploc = gl.getAttribLocation(program, "vPosition");
 130   var cloc = gl.getAttribLocation(program, "vColor");
 131   gl.bindBuffer(gl.ARRAY_BUFFER, positions);
 132   gl.enableVertexAttribArray(positionLocation);
 133   gl.vertexAttribPointer(positionLocation, 3, gl.FLOAT, false, 0, 0);
 134   gl.bindBuffer(gl.ARRAY_BUFFER, colors);
 135   gl.enableVertexAttribArray(colorLocation);
 136   gl.vertexAttribPointer(colorLocation, 4, gl.FLOAT, false, 0, 0);
 137 }
 138
 139 function checkDraw(colorLocation, positionLocation, r, g, b, a) {
 140   gl.clearColor(0, 0, 0, 1);
 141   gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
 142   gl.drawArrays(gl.TRIANGLES, 0, 3);
 143
 144   var width = 50;
 145   var height = 50;
 146   var buf = new Uint8Array(width * height * 4);
 147   gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
 148
 149   function checkPixel(x, y, r, g, b, a) {
 150     var offset = (y * width + x) * 4;
 151     if (buf[offset + 0] != r ||
 152         buf[offset + 1] != g ||
 153         buf[offset + 2] != b ||
 154         buf[offset + 3] != a) {
 155         fail(x, y, buf, "(" + r + "," + g + "," + b + "," + a + ")");
 156         return false;
 157     }
 158     return true;
 159   }
 160
 161   // Test several locations
 162   // First line should be all black
 163   var success = true;
 164   for (var i = 0; i < 50; ++i)
 165     success = success && checkPixel(i, 0, 0, 0, 0, 255);
 166
 167   // Line 15 should be red for at least 10 rgba pixels starting 20 pixels in
 168   var offset = (15 * 50 + 20) * 4;
 169   for (var i = 0; i < 10; ++i)
 170     success = success && checkPixel(20 + i, 15, r, g, b, a);
 171
 172   // Last line should be all black
 173   for (var i = 0; i < 50; ++i)
 174     success = success && checkPixel(i, 49, 0, 0, 0, 255);
 175
 176   if (success)
 177     pass();
 178
 179   gl.disableVertexAttribArray(positionLocation);
 180   gl.disableVertexAttribArray(colorLocation);
 181 }
 182
 183 setBindLocations(2, 3);
 184 checkDraw(2, 3, 0, 255, 0, 255);
 185
 186 setBindLocations(0, 3);
 187 gl.disableVertexAttribArray(0);
 188 gl.vertexAttrib4f(0, 1, 0, 0, 1);
 189 checkDraw(0, 3, 255, 0, 0, 255);
 190
 191 glErrorShouldBe(gl, gl.NO_ERROR);
 192
 193 debug("");
 194
 195 </script>
 196
 197 </body>
 198 </html>