LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/glsl/misc/glsl-vertex-branch.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2012 The Khronos Group Inc.
 **
 ** Permission is hereby granted, free of charge, to any person obtaining a
 ** copy of this software and/or associated documentation files (the
 ** "Materials"), to deal in the Materials without restriction, including
 ** without limitation the rights to use, copy, modify, merge, publish,
 ** distribute, sublicense, and/or sell copies of the Materials, and to
 ** permit persons to whom the Materials are furnished to do so, subject to
 ** the following conditions:
 **
 ** The above copyright notice and this permission notice shall be included
 ** in all copies or substantial portions of the Materials.
 **
 ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
 */

 -->

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>GLSL function nodes Test</title>
 <link rel="stylesheet" href="../../../resources/js-test-style.css"/>
 <link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
 <script src="../../../js/js-test-pre.js"></script>
 <script src="../../../js/webgl-test-utils.js"> </script>

 <script id="vshaderNoBranch" type="x-shader/x-vertex">
 attribute vec3 aPosition;
 uniform float redIntensity;

 varying vec4 vColor;

 float MADBug(float paramValue) {
   float localVar = 1.0;
   return 0.25 * ceil(localVar) + paramValue;
 }

 void main(void) {
     gl_Position = vec4(aPosition, 1.0);
     vColor = vec4(MADBug(redIntensity), 0., 0., 1.);
 }
 </script>

 <script id="vshaderBranch" type="x-shader/x-vertex">
 attribute vec3 aPosition;
 uniform float redIntensity;

 varying vec4 vColor;

 float MADBug(float paramValue) {
   float localVar = 1.0;
   return 0.25 * ceil(localVar) + paramValue;
 }

 void main(void) {
     float condition = 42.;
     if (condition == 0.) {}
     gl_Position = vec4(aPosition, 1.0);
     vColor = vec4(MADBug(redIntensity), 0., 0., 1.);
 }
 </script>

 <script id="fshader" type="x-shader/x-fragment">
 precision mediump float;

 varying vec4 vColor;
 void main()
 {
    gl_FragColor = vColor;
 }
 </script>
 </head>
 <body>
 <canvas id="canvasNoBranch" width="50" height="50"></canvas>
 <canvas id="canvasBranch" width="50" height="50"></canvas>
 <div id="description">This tests against a Mac driver bug related to branches
  inside of Vertex Shaders.</div>
 <div id="console"></div>
 <script>
 "use strict";
 var width = 50;
 var height = 50;
 var wtu = WebGLTestUtils;

 function drawAndRead(canvasID, vshaderID, buffer)
 {
     var gl = wtu.create3DContext(canvasID);
     var program = wtu.setupProgram(gl, [vshaderID, "fshader"], ["aPosition"]);
     var vertexObject = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
     gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -1,-1,0, 1,-1,0 ]), gl.STATIC_DRAW);
     gl.enableVertexAttribArray(0);
     gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);

     var loc = gl.getUniformLocation(program, "redIntensity");
     gl.uniform1f(loc, 0.75);
     gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
     gl.drawArrays(gl.TRIANGLES, 0, 3);
     gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buffer);
     if (gl.getError() != gl.NO_ERROR)
         return false;
     return true;
 }

 function compareRendering(buffer1, buffer2, tol)
 {
     for (var i = 0; i < width * height * 4; ++i) {
         if (Math.abs(buffer1[i] - buffer2[i]) > tol)
             return false;
     }
     return true;
 }

 function init()
 {
     description("tests vertex shader with branch");

     var bufBranch = new Uint8Array(width * height * 4);
     var bufNoBranch = new Uint8Array(width * height * 4);

     if (drawAndRead("canvasBranch", "vshaderBranch", bufBranch) == false ||
         drawAndRead("canvasNoBranch", "vshaderNoBranch", bufNoBranch) == false) {
         testFailed("Setup failed");
     } else {
         if (compareRendering(bufBranch, bufNoBranch, 4) == false)
             testFailed("Rendering results are different");
         else
             testPassed("Rendering results are the same");
     }
 }

 init();
 var successfullyParsed = true;
 </script>
 <script src="../../../js/js-test-post.js"></script>
 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2012 The Khronos Group Inc.
	**
	** Permission is hereby granted, free of charge, to any person obtaining a
	** copy of this software and/or associated documentation files (the
	** "Materials"), to deal in the Materials without restriction, including
	** without limitation the rights to use, copy, modify, merge, publish,
	** distribute, sublicense, and/or sell copies of the Materials, and to
	** permit persons to whom the Materials are furnished to do so, subject to
	** the following conditions:
	**
	** The above copyright notice and this permission notice shall be included
	** in all copies or substantial portions of the Materials.
	**
	** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
	** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
	** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
	** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
	*/

	-->

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>GLSL function nodes Test</title>
	<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
	<link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
	<script src="../../../js/js-test-pre.js"></script>
	<script src="../../../js/webgl-test-utils.js"> </script>

	<script id="vshaderNoBranch" type="x-shader/x-vertex">
	attribute vec3 aPosition;
	uniform float redIntensity;

	varying vec4 vColor;

	float MADBug(float paramValue) {
	float localVar = 1.0;
	return 0.25 * ceil(localVar) + paramValue;
	}

	void main(void) {
	gl_Position = vec4(aPosition, 1.0);
	vColor = vec4(MADBug(redIntensity), 0., 0., 1.);
	}
	</script>

	<script id="vshaderBranch" type="x-shader/x-vertex">
	attribute vec3 aPosition;
	uniform float redIntensity;

	varying vec4 vColor;

	float MADBug(float paramValue) {
	float localVar = 1.0;
	return 0.25 * ceil(localVar) + paramValue;
	}

	void main(void) {
	float condition = 42.;
	if (condition == 0.) {}
	gl_Position = vec4(aPosition, 1.0);
	vColor = vec4(MADBug(redIntensity), 0., 0., 1.);
	}
	</script>

	<script id="fshader" type="x-shader/x-fragment">
	precision mediump float;

	varying vec4 vColor;
	void main()
	{
	gl_FragColor = vColor;
	}
	</script>
	</head>
	<body>
	<canvas id="canvasNoBranch" width="50" height="50"></canvas>
	<canvas id="canvasBranch" width="50" height="50"></canvas>
	<div id="description">This tests against a Mac driver bug related to branches
	inside of Vertex Shaders.</div>
	<div id="console"></div>
	<script>
	"use strict";
	var width = 50;
	var height = 50;
	var wtu = WebGLTestUtils;

	function drawAndRead(canvasID, vshaderID, buffer)
	{
	var gl = wtu.create3DContext(canvasID);
	var program = wtu.setupProgram(gl, [vshaderID, "fshader"], ["aPosition"]);
	var vertexObject = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
	gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -1,-1,0, 1,-1,0 ]), gl.STATIC_DRAW);
	gl.enableVertexAttribArray(0);
	gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);

	var loc = gl.getUniformLocation(program, "redIntensity");
	gl.uniform1f(loc, 0.75);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);
	gl.drawArrays(gl.TRIANGLES, 0, 3);
	gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buffer);
	if (gl.getError() != gl.NO_ERROR)
	return false;
	return true;
	}

	function compareRendering(buffer1, buffer2, tol)
	{
	for (var i = 0; i < width * height * 4; ++i) {
	if (Math.abs(buffer1[i] - buffer2[i]) > tol)
	return false;
	}
	return true;
	}

	function init()
	{
	description("tests vertex shader with branch");

	var bufBranch = new Uint8Array(width * height * 4);
	var bufNoBranch = new Uint8Array(width * height * 4);

	if (drawAndRead("canvasBranch", "vshaderBranch", bufBranch) == false \|\|
	drawAndRead("canvasNoBranch", "vshaderNoBranch", bufNoBranch) == false) {
	testFailed("Setup failed");
	} else {
	if (compareRendering(bufBranch, bufNoBranch, 4) == false)
	testFailed("Rendering results are different");
	else
	testPassed("Rendering results are the same");
	}
	}

	init();
	var successfullyParsed = true;
	</script>
	<script src="../../../js/js-test-post.js"></script>
	</body>
	</html>