| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>gl_FragCoord multisampling bug</title> |
| <link rel="stylesheet" href="../../../resources/js-test-style.css"/> |
| <script src="../../../js/js-test-pre.js"></script> |
| <script src="../../../js/webgl-test-utils.js"></script> |
| </head> |
| <body> |
| <div id="canvasHolder"></div> |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script id="vshader" type="x-shader/x-vertex"> |
| attribute vec4 a_position; |
| void main() { |
| gl_Position = vec4(a_position.xy, 1.0, 1.0); |
| } |
| </script> |
| |
| <script id="fshader" type="x-shader/x-fragment"> |
| precision mediump float; |
| |
| void main() { |
| float depth = gl_FragCoord.z / gl_FragCoord.w; |
| gl_FragColor = vec4( 0.0, depth, 0.0, 1.0 ); |
| } |
| </script> |
| |
| <script type="application/javascript"> |
| "use strict"; |
| description("gl_FragCoord multisampling bug"); |
| debug("Verifies gl_FragCoord z/w values are unaffected by multisampling."); |
| debug('Regression test for <a href="https://github.com/mrdoob/three.js/issues/7769">Three.js Issue 7769</a>'); |
| var wtu = WebGLTestUtils; |
| for (var ii = 0; ii < 2; ++ii) { |
| debug("Testing " + (ii > 0 ? "with" : "without") + " multisampling"); |
| var canvas = document.createElement('canvas'); |
| canvas.width = 256; |
| canvas.height = 256; |
| canvas.style.padding = "2px"; |
| document.getElementById('canvasHolder').appendChild(canvas); |
| var options; |
| if (ii > 0) { |
| options = { antialias: true }; |
| } |
| var gl = wtu.create3DContext(canvas, options); |
| |
| gl.clearColor(1, 0, 0, 1); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| |
| var attribBuffers = wtu.setupUnitQuad(gl, 0, 1); |
| var program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['a_position'], [0], true); |
| if (!program) { |
| testFailed("Shader compilation/link failed"); |
| } else { |
| // Draw |
| wtu.drawUnitQuad(gl); |
| // Verify output |
| wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green", 3); |
| } |
| } |
| |
| finishTest(); |
| </script> |
