dom/canvas/test/webgl-conf/checkout/conformance/rendering/gl-scissor-fbo-test.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 Scissor FBO 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="canvas" width="16" height="16" style="width: 40px; height: 40px;"> </canvas>
  18 <canvas id="canvas2" width="16" height="16" style="width: 40px; height: 40px;"> </canvas>
  19 <div id="description"></div>
  20 <div id="console"></div>
  21 <script>
  22 "use strict";
  23 description("Checks the scissor does not change when switching framebuffers.");
  24
  25 var wtu = WebGLTestUtils;
  26 var gl;
  27
  28 function makeFramebuffer(width, height) {
  29   var tex = gl.createTexture();
  30   gl.bindTexture(gl.TEXTURE_2D, tex);
  31   gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
  32   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
  33   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
  34   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
  35   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
  36   var fb = gl.createFramebuffer();
  37   gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  38   gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
  39   shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
  40   gl.bindFramebuffer(gl.FRAMEBUFFER, null);
  41   return fb;
  42 }
  43
  44 function checkCanvasRect(x, y, width, height, color, msg) {
  45   debug("checking: " + x + ", " + y + ", " + width + ", " + height);
  46   wtu.checkCanvasRect(gl, x, y, width, height, color, msg);
  47 }
  48
  49 function runEntireTest(canvasName, antialias) {
  50   debug("");
  51   debug("== Running scissor fbo test with antialias:" + antialias + " ==");
  52   debug("");
  53
  54   gl = wtu.create3DContext(canvasName, {antialias: antialias});
  55   if (!gl) {
  56     testFailed("context does not exist");
  57     return;
  58   }
  59   testPassed("context exists");
  60
  61   var fb8x8 = makeFramebuffer(8, 8);
  62   var fb32x32 = makeFramebuffer(32, 32);
  63
  64   var testScissor = function(scissorX, scissorY, scissorWidth, scissorHeight, msg) {
  65     debug("");
  66     debug(msg);
  67
  68     var test = function(fb, size) {
  69       debug("");
  70       debug("checking size: " + size);
  71       gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  72       gl.clearColor(0, 1, 0, 1);
  73       gl.clear(gl.COLOR_BUFFER_BIT);
  74       var scissorRight = Math.min(scissorX + scissorWidth, size);
  75       var scissorTop = Math.min(scissorY + scissorHeight, size);
  76       var scWidth = scissorRight - scissorX;
  77       var scHeight = scissorTop - scissorY;
  78       var rightWidth = Math.min(size - scissorRight, 0);
  79       var topHeight = Math.max(size - scissorTop, 0);
  80       checkCanvasRect(scissorX, scissorY, scWidth, scHeight, [0, 255, 0, 255], "should be green");
  81       checkCanvasRect(0, 0, size, scissorY, [255, 0, 0, 255], "should be red");
  82       checkCanvasRect(0, scissorTop, size, topHeight, [255, 0, 0, 255], "should be red");
  83       checkCanvasRect(0, 0, scissorX, size, [255, 0, 0, 255], "should be red");
  84       checkCanvasRect(scissorRight, 0, scissorX, rightWidth, [255, 0, 0, 255], "should be red");
  85     };
  86
  87     gl.disable(gl.SCISSOR_TEST);
  88     gl.clearColor(1, 0, 0, 1);
  89     gl.bindFramebuffer(gl.FRAMEBUFFER, null);
  90     gl.clear(gl.COLOR_BUFFER_BIT);
  91     gl.bindFramebuffer(gl.FRAMEBUFFER, fb8x8);
  92     gl.clear(gl.COLOR_BUFFER_BIT);
  93     gl.bindFramebuffer(gl.FRAMEBUFFER, fb32x32);
  94     gl.clear(gl.COLOR_BUFFER_BIT);
  95
  96     gl.bindFramebuffer(gl.FRAMEBUFFER, fb32x32);
  97     gl.enable(gl.SCISSOR_TEST);
  98     gl.scissor(scissorX, scissorY, scissorWidth, scissorHeight);
  99     test(null, 16);
 100     test(fb8x8, 8);
 101     test(fb32x32, 32);
 102     test(null, 16);
 103   };
 104
 105   testScissor(2, 4, 12, 10, "test scissor in middle");
 106   testScissor(0, 0, 12, 10, "test scissor at 0,0");
 107   testScissor(0, 0, 16, 16, "test scissor with size that matches drawingbuffer");
 108
 109   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
 110 }
 111
 112 runEntireTest("canvas", false);
 113 runEntireTest("canvas2", true);
 114
 115 debug("");
 116 var successfullyParsed = true;
 117 </script>
 118 <script src="../../js/js-test-post.js"></script>
 119
 120 </body>
 121 </html>