LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/extensions/webgl-draw-buffers-max-draw-buffers.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2015 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>WebGL WEBGL_draw_buffers gl_FragData[gl_MaxDrawBuffers] Conformance Test</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="description"></div>
 <canvas id="canvas" width="64" height="64"> </canvas>
 <div id="console"></div>
 <script id="vshader" type="x-shader/x-vertex">
 attribute vec4 a_position;
 void main() {
     gl_Position = a_position;
 }
 </script>
 <script id="fshader" type="x-shader/x-fragment">
 #extension GL_EXT_draw_buffers : require
 precision mediump float;
 void main() {
     gl_FragData[gl_MaxDrawBuffers] = vec4(0.0);
 }
 </script>
 <script id="fshaderConstantIndex" type="x-shader/x-fragment">
 #extension GL_EXT_draw_buffers : require
 precision mediump float;
 void main() {
     gl_FragData[$(gl_MaxDrawBuffers)] = vec4(0.0);
 }
 </script>
 <script id="fshaderTestMaxDrawBuffersValue" type="x-shader/x-fragment">
 #extension GL_EXT_draw_buffers : require
 precision mediump float;
 void main() {
     gl_FragColor = ($(gl_MaxDrawBuffers) == gl_MaxDrawBuffers) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
 }
 </script>
 <script>
 "use strict";
 description("This test verifies that compiling the same shader using GL_EXT_draw_buffers twice will have similar results on both rounds.");

 debug("");

 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("canvas");
 var gl = wtu.create3DContext(canvas);
 var ext = null;
 var maxDrawBuffers;

 if (!gl) {
   testFailed("WebGL context does not exist");
 } else {
   testPassed("WebGL context exists");

   ext = gl.getExtension("WEBGL_draw_buffers");
   if (!ext) {
     testPassed("No WEBGL_draw_buffers support -- this is legal");
     finishTest();
   } else {
     testPassed("Successfully enabled WEBGL_draw_buffers extension");
     maxDrawBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
     runShadersTest();
     finishTest();
   }
 }

 function testValueOfMaxDrawBuffers() {
   debug("Test the value of gl_MaxDrawBuffers in a shader");
   var fshader = wtu.replaceParams(wtu.getScript("fshaderTestMaxDrawBuffersValue"), {"gl_MaxDrawBuffers": maxDrawBuffers});
   var program = wtu.setupProgram(gl, ["vshader", fshader], ["a_position"], undefined, true);
   expectTrue(program != null, "Test program should compile");
   wtu.setupUnitQuad(gl);
   wtu.clearAndDrawUnitQuad(gl);
   wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green to indicate that gl_MaxDrawBuffers had the right value");
   gl.deleteProgram(program);
   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
 }

 function runSingleTest(shaders, indexMsg) {
   var program = wtu.setupProgram(gl, shaders, ["a_position"], undefined, true);
   var programLinkedSuccessfully = (program != null);
   expectTrue(!programLinkedSuccessfully, "Program where gl_FragData is indexed by " + indexMsg + " should fail compilation.");
   gl.deleteProgram(program);
 }

 function runShadersTest() {
   debug("MAX_DRAW_BUFFERS_WEBGL is: " + maxDrawBuffers);

   // For reference, use a constant out-of-range parameter to test:
   debug("Test indexing gl_FragData with value of MAX_DRAW_BUFFERS_WEBGL");
   var fshader = wtu.replaceParams(wtu.getScript("fshaderConstantIndex"), {"gl_MaxDrawBuffers": maxDrawBuffers});
   runSingleTest(["vshader", fshader], maxDrawBuffers + " (value of MAX_DRAW_BUFFERS_WEBGL)");

   debug("");

   debug("Test indexing gl_FragData with gl_MaxDrawBuffers");
   debug("Repeat this test twice as that has revealed a bug.");
   for (var i = 0; i < 2; ++i) {
     runSingleTest(["vshader", "fshader"], "gl_MaxDrawBuffers");
   }
   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");

   debug("");

   testValueOfMaxDrawBuffers();
 }
 </script>
 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2015 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>WebGL WEBGL_draw_buffers gl_FragData[gl_MaxDrawBuffers] Conformance Test</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="description"></div>
	<canvas id="canvas" width="64" height="64"> </canvas>
	<div id="console"></div>
	<script id="vshader" type="x-shader/x-vertex">
	attribute vec4 a_position;
	void main() {
	gl_Position = a_position;
	}
	</script>
	<script id="fshader" type="x-shader/x-fragment">
	#extension GL_EXT_draw_buffers : require
	precision mediump float;
	void main() {
	gl_FragData[gl_MaxDrawBuffers] = vec4(0.0);
	}
	</script>
	<script id="fshaderConstantIndex" type="x-shader/x-fragment">
	#extension GL_EXT_draw_buffers : require
	precision mediump float;
	void main() {
	gl_FragData[$(gl_MaxDrawBuffers)] = vec4(0.0);
	}
	</script>
	<script id="fshaderTestMaxDrawBuffersValue" type="x-shader/x-fragment">
	#extension GL_EXT_draw_buffers : require
	precision mediump float;
	void main() {
	gl_FragColor = ($(gl_MaxDrawBuffers) == gl_MaxDrawBuffers) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
	}
	</script>
	<script>
	"use strict";
	description("This test verifies that compiling the same shader using GL_EXT_draw_buffers twice will have similar results on both rounds.");

	debug("");

	var wtu = WebGLTestUtils;
	var canvas = document.getElementById("canvas");
	var gl = wtu.create3DContext(canvas);
	var ext = null;
	var maxDrawBuffers;

	if (!gl) {
	testFailed("WebGL context does not exist");
	} else {
	testPassed("WebGL context exists");

	ext = gl.getExtension("WEBGL_draw_buffers");
	if (!ext) {
	testPassed("No WEBGL_draw_buffers support -- this is legal");
	finishTest();
	} else {
	testPassed("Successfully enabled WEBGL_draw_buffers extension");
	maxDrawBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
	runShadersTest();
	finishTest();
	}
	}

	function testValueOfMaxDrawBuffers() {
	debug("Test the value of gl_MaxDrawBuffers in a shader");
	var fshader = wtu.replaceParams(wtu.getScript("fshaderTestMaxDrawBuffersValue"), {"gl_MaxDrawBuffers": maxDrawBuffers});
	var program = wtu.setupProgram(gl, ["vshader", fshader], ["a_position"], undefined, true);
	expectTrue(program != null, "Test program should compile");
	wtu.setupUnitQuad(gl);
	wtu.clearAndDrawUnitQuad(gl);
	wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green to indicate that gl_MaxDrawBuffers had the right value");
	gl.deleteProgram(program);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
	}

	function runSingleTest(shaders, indexMsg) {
	var program = wtu.setupProgram(gl, shaders, ["a_position"], undefined, true);
	var programLinkedSuccessfully = (program != null);
	expectTrue(!programLinkedSuccessfully, "Program where gl_FragData is indexed by " + indexMsg + " should fail compilation.");
	gl.deleteProgram(program);
	}

	function runShadersTest() {
	debug("MAX_DRAW_BUFFERS_WEBGL is: " + maxDrawBuffers);

	// For reference, use a constant out-of-range parameter to test:
	debug("Test indexing gl_FragData with value of MAX_DRAW_BUFFERS_WEBGL");
	var fshader = wtu.replaceParams(wtu.getScript("fshaderConstantIndex"), {"gl_MaxDrawBuffers": maxDrawBuffers});
	runSingleTest(["vshader", fshader], maxDrawBuffers + " (value of MAX_DRAW_BUFFERS_WEBGL)");

	debug("");

	debug("Test indexing gl_FragData with gl_MaxDrawBuffers");
	debug("Repeat this test twice as that has revealed a bug.");
	for (var i = 0; i < 2; ++i) {
	runSingleTest(["vshader", "fshader"], "gl_MaxDrawBuffers");
	}
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");

	debug("");

	testValueOfMaxDrawBuffers();
	}
	</script>
	</body>
	</html>