third_party/WebKit/LayoutTests/fast/canvas/webgl/texture-bindings-uneffected-on-resize.html

   1 <html>
   2 <head>
   3 <meta charset="utf-8">
   4 <script src="../../../resources/js-test.js"></script>
   5 <script src="resources/webgl-test.js"></script>
   6 <script src="resources/webgl-test-utils.js"></script>
   7 </head>
   8 <body>
   9 <canvas id="example" width="4px" height="4px"></canvas>
  10 <div id="description"></div>
  11 <div id="console"></div>
  12 <script>
  13 description('Verifies that GL texture bindings do not change when canvas is resized');
  14
  15 var err;
  16 var wtu = WebGLTestUtils;
  17 var canvas = document.getElementById("example");
  18 var gl = wtu.create3DContext(canvas);
  19 var program = wtu.setupTexturedQuad(gl);
  20
  21 var green = [0, 255, 0, 255];
  22 var blue = [0, 0, 255, 255];
  23 var tex0 = gl.createTexture();
  24 wtu.fillTexture(gl, tex0, 1, 1, blue, 0);
  25 gl.activeTexture(gl.TEXTURE1)
  26 var tex1 = gl.createTexture();
  27 wtu.fillTexture(gl, tex1, 1, 1, green, 0);
  28
  29 var loc = gl.getUniformLocation(program, "tex");
  30
  31 function test() {
  32   gl.viewport(0, 0, canvas.width, canvas.height);
  33   gl.uniform1i(loc, 0);
  34   wtu.drawQuad(gl);
  35   wtu.checkCanvas(gl, blue, "should be blue");
  36   gl.uniform1i(loc, 1);
  37   wtu.drawQuad(gl);
  38   wtu.checkCanvas(gl, green, "should be green");
  39 }
  40
  41 debug("test before resizing canvas");
  42 test();
  43 debug("test after resizing canvas");
  44 canvas.width = 8;
  45 test();
  46
  47 successfullyParsed = true;
  48 </script>
  49 </body>
  50 </html>
  51