third_party/WebKit/LayoutTests/fast/canvas/webgl/attrib-location-length-limits.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <meta charset="utf-8">
   5 <title>WebGL attrib location length tests</title>
   6 <script src="../../../resources/js-test.js"></script>
   7 <script src="resources/webgl-test.js"> </script>
   8 <script src="resources/webgl-test-utils.js"> </script>
   9 </head>
  10 <body>
  11 <canvas id="example" width="50" height="50">
  12 There is supposed to be an example drawing here, but it's not important.
  13 </canvas>
  14 <div id="description">Verify limits on the lengths of attrib locations.</div>
  15 <div id="console"></div>
  16 <script id="goodVertexShader1" type="x-shader/x-vertex">
  17 // A vertex shader where the needed attrib location is long, but not over the limit.
  18 attribute vec4 vPosition01234567890123456789012345678901234567890123456789012345678901234567890;
  19
  20 void main()
  21 {
  22     gl_Position = vPosition01234567890123456789012345678901234567890123456789012345678901234567890;
  23 }
  24 </script>
  25 <script id="goodVertexShader2" type="x-shader/x-vertex">
  26 // A vertex shader where the needed attrib location is exactly 256 characters.
  27 attribute vec4 vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456;
  28
  29 void main()
  30 {
  31     gl_Position = vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456;
  32 }
  33 </script>
  34 <script id="badVertexShader" type="x-shader/x-vertex">
  35 // A vertex shader where the needed attrib location is 257 characters.
  36 attribute vec4 vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567;
  37
  38 void main()
  39 {
  40     gl_Position = vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567;
  41 }
  42 </script>
  43 <script id="fragmentShader" type="x-shader/x-fragment">
  44 precision mediump float;
  45
  46 void main() {
  47     gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
  48 }
  49 </script>
  50 <script>
  51 if (window.initNonKhronosFramework) {
  52     window.initNonKhronosFramework(false);
  53 }
  54 if (window.internals)
  55     window.internals.settings.setWebGLErrorsToConsoleEnabled(false);
  56
  57 var wtu = WebGLTestUtils;
  58 var gl = wtu.create3DContext(document.getElementById("example"));
  59
  60 debug("Test attrib location underneath the length limit");
  61 var program = wtu.loadProgramFromScript(gl, "goodVertexShader1", "fragmentShader");
  62 shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true');
  63 var attribLoc = gl.getAttribLocation(program, "vPosition01234567890123456789012345678901234567890123456789012345678901234567890");
  64 if (attribLoc == -1) {
  65     testFailed("attrib location was -1, should not be");
  66 } else {
  67     testPassed("attrib location should not be -1");
  68 }
  69 wtu.glErrorShouldBe(gl, gl.NONE);
  70
  71 debug("Test attrib location exactly at the length limit");
  72 var program = wtu.loadProgramFromScript(gl, "goodVertexShader2", "fragmentShader");
  73 shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true');
  74 var attribLoc = gl.getAttribLocation(program, "vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456");
  75 if (attribLoc == -1) {
  76     testFailed("attrib location was -1, should not be");
  77 } else {
  78     testPassed("attrib location should not be -1");
  79 }
  80 wtu.glErrorShouldBe(gl, gl.NONE);
  81
  82 debug("Test attrib location over the length limit");
  83 debug("Shader compilation should fail");
  84 shouldBe('wtu.loadShaderFromScript(gl, "badVertexShader", gl.VERTEX_SHADER, function (err) {})', 'null');
  85 wtu.glErrorShouldBe(gl, gl.NONE);
  86
  87 debug("Attempt to bind too-long attrib location should produce error");
  88 var program = gl.createProgram();
  89 gl.bindAttribLocation(program, 0, "vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567");
  90 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
  91
  92 debug("Attempt to fetch too-long attrib location should produce error");
  93 shouldBe('gl.getAttribLocation(program, "vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567")', '-1');
  94 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
  95
  96 </script>
  97 </body>
  98 </html>