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

 <!--

 /*
 ** Copyright (c) 2016 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 Rendering and Sampling Feedback Loop Tests For WEBGL_draw_buffers Extension</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>
 <canvas id="example" width="8" height="8"></canvas>
 <div id="description"></div>
 <div id="console"></div>

 <script id="vshader" type="x-shader/x-vertex">
 attribute vec4 aPosition;
 attribute vec2 aTexCoord;
 varying vec2 texCoord;
 void main() {
     gl_Position = aPosition;
     texCoord = aTexCoord;
 }
 </script>

 <script id="fshader" type="x-shader/x-fragment">
 #extension GL_EXT_draw_buffers : require
 precision mediump float;
 uniform sampler2D tex;
 varying vec2 texCoord;
 void main() {
     gl_FragData[0] = texture2D(tex, texCoord);
     gl_FragData[1] = texture2D(tex, texCoord);
 }
 </script>

 <script>
 "use strict";

 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("example");
 description("This test verifies the functionality of rendering to the same texture where it samples from.");

 var gl = wtu.create3DContext(canvas);

 var width = 8;
 var height = 8;
 var tex0;
 var tex1;
 var fbo;
 var ext;
 var program;
 var positionLoc;
 var texCoordLoc;

 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");

         init();

         // The sampling texture is bound to COLOR_ATTACHMENT1 during resource allocation
         allocate_resource();

         rendering_sampling_feedback_loop([gl.NONE, ext.COLOR_ATTACHMENT1_WEBGL], gl.INVALID_OPERATION);
         rendering_sampling_feedback_loop([gl.COLOR_ATTACHMENT0, ext.COLOR_ATTACHMENT1_WEBGL], gl.INVALID_OPERATION);
         rendering_sampling_feedback_loop([gl.COLOR_ATTACHMENT0, gl.NONE], gl.NO_ERROR);
     }
 }

 function init() {
     program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['aPosition', 'aTexCoord'], [0, 1]);
     positionLoc = gl.getAttribLocation(program, "aPosition");
     texCoordLoc = gl.getAttribLocation(program, "aTexCoord");
     if (!program || positionLoc < 0 || texCoordLoc < 0) {
         testFailed("Set up program failed");
         return;
     }
     testPassed("Set up program succeeded");

     wtu.setupUnitQuad(gl, 0, 1);
     gl.viewport(0, 0, width, height);
 }

 function allocate_resource() {
     tex0 = gl.createTexture();
     tex1 = gl.createTexture();
     fbo = gl.createFramebuffer();
     wtu.fillTexture(gl, tex0, width, height, [0xff, 0x0, 0x0, 0xff], 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.RGBA);
     wtu.fillTexture(gl, tex1, width, height, [0x0, 0xff, 0x0, 0xff], 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.RGBA);

     gl.bindTexture(gl.TEXTURE_2D, tex1);
     var texLoc = gl.getUniformLocation(program, "tex");
     gl.uniform1i(texLoc, 0);

     gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex0, 0);
     gl.framebufferTexture2D(gl.FRAMEBUFFER, ext.COLOR_ATTACHMENT1_WEBGL, gl.TEXTURE_2D, tex1, 0);
 }

 function rendering_sampling_feedback_loop(draw_buffers, error) {
     // gl.drawBuffers(draw_buffers);
     ext.drawBuffersWEBGL(draw_buffers);

     // Make sure framebuffer is complete before feedback loop detection
     if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
         testFailed("Framebuffer incomplete.");
         return;
     }

     wtu.clearAndDrawUnitQuad(gl);
     wtu.glErrorShouldBe(gl, error, "Rendering to a texture where it samples from should geneates INVALID_OPERATION. Otherwise, it should be NO_ERROR");
 }

 gl.bindTexture(gl.TEXTURE_2D, null);
 gl.bindFramebuffer(gl.FRAMEBUFFER, null);
 gl.deleteTexture(tex0);
 gl.deleteTexture(tex1);
 gl.deleteFramebuffer(fbo);

 var successfullyParsed = true;
 </script>
 <script src="../../js/js-test-post.js"></script>

 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2016 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 Rendering and Sampling Feedback Loop Tests For WEBGL_draw_buffers Extension</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>
	<canvas id="example" width="8" height="8"></canvas>
	<div id="description"></div>
	<div id="console"></div>

	<script id="vshader" type="x-shader/x-vertex">
	attribute vec4 aPosition;
	attribute vec2 aTexCoord;
	varying vec2 texCoord;
	void main() {
	gl_Position = aPosition;
	texCoord = aTexCoord;
	}
	</script>

	<script id="fshader" type="x-shader/x-fragment">
	#extension GL_EXT_draw_buffers : require
	precision mediump float;
	uniform sampler2D tex;
	varying vec2 texCoord;
	void main() {
	gl_FragData[0] = texture2D(tex, texCoord);
	gl_FragData[1] = texture2D(tex, texCoord);
	}
	</script>

	<script>
	"use strict";

	var wtu = WebGLTestUtils;
	var canvas = document.getElementById("example");
	description("This test verifies the functionality of rendering to the same texture where it samples from.");

	var gl = wtu.create3DContext(canvas);

	var width = 8;
	var height = 8;
	var tex0;
	var tex1;
	var fbo;
	var ext;
	var program;
	var positionLoc;
	var texCoordLoc;

	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");

	init();

	// The sampling texture is bound to COLOR_ATTACHMENT1 during resource allocation
	allocate_resource();

	rendering_sampling_feedback_loop([gl.NONE, ext.COLOR_ATTACHMENT1_WEBGL], gl.INVALID_OPERATION);
	rendering_sampling_feedback_loop([gl.COLOR_ATTACHMENT0, ext.COLOR_ATTACHMENT1_WEBGL], gl.INVALID_OPERATION);
	rendering_sampling_feedback_loop([gl.COLOR_ATTACHMENT0, gl.NONE], gl.NO_ERROR);
	}
	}

	function init() {
	program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['aPosition', 'aTexCoord'], [0, 1]);
	positionLoc = gl.getAttribLocation(program, "aPosition");
	texCoordLoc = gl.getAttribLocation(program, "aTexCoord");
	if (!program \|\| positionLoc < 0 \|\| texCoordLoc < 0) {
	testFailed("Set up program failed");
	return;
	}
	testPassed("Set up program succeeded");

	wtu.setupUnitQuad(gl, 0, 1);
	gl.viewport(0, 0, width, height);
	}

	function allocate_resource() {
	tex0 = gl.createTexture();
	tex1 = gl.createTexture();
	fbo = gl.createFramebuffer();
	wtu.fillTexture(gl, tex0, width, height, [0xff, 0x0, 0x0, 0xff], 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.RGBA);
	wtu.fillTexture(gl, tex1, width, height, [0x0, 0xff, 0x0, 0xff], 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.RGBA);

	gl.bindTexture(gl.TEXTURE_2D, tex1);
	var texLoc = gl.getUniformLocation(program, "tex");
	gl.uniform1i(texLoc, 0);

	gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex0, 0);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, ext.COLOR_ATTACHMENT1_WEBGL, gl.TEXTURE_2D, tex1, 0);
	}

	function rendering_sampling_feedback_loop(draw_buffers, error) {
	// gl.drawBuffers(draw_buffers);
	ext.drawBuffersWEBGL(draw_buffers);

	// Make sure framebuffer is complete before feedback loop detection
	if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
	testFailed("Framebuffer incomplete.");
	return;
	}

	wtu.clearAndDrawUnitQuad(gl);
	wtu.glErrorShouldBe(gl, error, "Rendering to a texture where it samples from should geneates INVALID_OPERATION. Otherwise, it should be NO_ERROR");
	}

	gl.bindTexture(gl.TEXTURE_2D, null);
	gl.bindFramebuffer(gl.FRAMEBUFFER, null);
	gl.deleteTexture(tex0);
	gl.deleteTexture(tex1);
	gl.deleteFramebuffer(fbo);

	var successfullyParsed = true;
	</script>
	<script src="../../js/js-test-post.js"></script>

	</body>
	</html>