LayoutTests/webgl/1.0.3/resources/webgl_test_files/conformance/renderbuffers/feedback-loop.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2014 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 Feedback Loop</title>
     <link rel="stylesheet" href="../../resources/js-test-style.css"/>
     <script src="../../resources/js-test-pre.js"></script>
     <script src="../resources/webgl-test-utils.js"> </script>
   </head>
   <body>
     <canvas id="example" width="1" height="1" style="width: 40px; height: 40px;"></canvas>
     <div id="description"></div>
     <div id="console"></div>

     <script id="vs" type="text/something-not-javascript">
     attribute vec4 a_position;
     attribute vec2 a_texCoord;
     varying vec2 v_texCoord;
     void main() {
         gl_Position = a_position;
         v_texCoord = a_texCoord;
     }
     </script>
     <script id="fs" type="text/something-not-javascript">
     precision mediump float;
     varying vec2 v_texCoord;
     uniform sampler2D u_texture;
     void main() {
         // Shader swizzles color channels so we can tell if the draw succeeded.
         gl_FragColor = texture2D(u_texture, v_texCoord).gbra;
     }
     </script>
     <script>
     "use strict";
     description("Checks that rendering feedback loops fail correctly.");
     var wtu = WebGLTestUtils;
     var gl = wtu.create3DContext("example");

     var texture = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, texture);
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
                   new Uint8Array([255, 0, 0, 255]));
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");

     var framebuffer = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);

     assertMsg(gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE,
         "framebuffer should be FRAMEBUFFER_COMPLETE.");

     var program = wtu.setupProgram(gl, ["vs", "fs"], ["a_position", "a_texCoord"]);
     gl.uniform1i(gl.getUniformLocation(program, "u_texture"), 0);
     gl.disable(gl.BLEND);
     gl.disable(gl.DEPTH_TEST);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after initWebGL");

     // Drawing with a texture that is also bound to the current framebuffer should fail
     var bufferObjects = wtu.setupUnitQuad(gl, 0, 1);
     gl.bindTexture(gl.TEXTURE_2D, texture);
     wtu.drawUnitQuad(gl);
     wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "after draw with invalid feedback loop");

     // Ensure that the texture contents did not change after the previous render
     gl.bindFramebuffer(gl.FRAMEBUFFER, null);
     wtu.clearAndDrawUnitQuad(gl);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
     wtu.checkCanvas(gl, [0, 0, 255, 255], "Should be blue.");

     // Drawing when texture is bound to an inactive uniform should succeed
     var texture2 = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, texture2);
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
                   new Uint8Array([0, 255, 0, 255]));
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

     gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
     gl.activeTexture(gl.TEXTURE1);
     gl.bindTexture(gl.TEXTURE_2D, texture);
     wtu.drawUnitQuad(gl);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after draw where framebuffer texture is bound to inactive texture unit");
     wtu.checkCanvas(gl, [255, 0, 0, 255], "Should be red.");

     var successfullyParsed = true;
     </script>

     <script src="../../resources/js-test-post.js"></script>

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

	/*
	** Copyright (c) 2014 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 Feedback Loop</title>
	<link rel="stylesheet" href="../../resources/js-test-style.css"/>
	<script src="../../resources/js-test-pre.js"></script>
	<script src="../resources/webgl-test-utils.js"> </script>
	</head>
	<body>
	<canvas id="example" width="1" height="1" style="width: 40px; height: 40px;"></canvas>
	<div id="description"></div>
	<div id="console"></div>

	<script id="vs" type="text/something-not-javascript">
	attribute vec4 a_position;
	attribute vec2 a_texCoord;
	varying vec2 v_texCoord;
	void main() {
	gl_Position = a_position;
	v_texCoord = a_texCoord;
	}
	</script>
	<script id="fs" type="text/something-not-javascript">
	precision mediump float;
	varying vec2 v_texCoord;
	uniform sampler2D u_texture;
	void main() {
	// Shader swizzles color channels so we can tell if the draw succeeded.
	gl_FragColor = texture2D(u_texture, v_texCoord).gbra;
	}
	</script>
	<script>
	"use strict";
	description("Checks that rendering feedback loops fail correctly.");
	var wtu = WebGLTestUtils;
	var gl = wtu.create3DContext("example");

	var texture = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_2D, texture);
	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
	new Uint8Array([255, 0, 0, 255]));
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");

	var framebuffer = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);

	assertMsg(gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE,
	"framebuffer should be FRAMEBUFFER_COMPLETE.");

	var program = wtu.setupProgram(gl, ["vs", "fs"], ["a_position", "a_texCoord"]);
	gl.uniform1i(gl.getUniformLocation(program, "u_texture"), 0);
	gl.disable(gl.BLEND);
	gl.disable(gl.DEPTH_TEST);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after initWebGL");

	// Drawing with a texture that is also bound to the current framebuffer should fail
	var bufferObjects = wtu.setupUnitQuad(gl, 0, 1);
	gl.bindTexture(gl.TEXTURE_2D, texture);
	wtu.drawUnitQuad(gl);
	wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "after draw with invalid feedback loop");

	// Ensure that the texture contents did not change after the previous render
	gl.bindFramebuffer(gl.FRAMEBUFFER, null);
	wtu.clearAndDrawUnitQuad(gl);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
	wtu.checkCanvas(gl, [0, 0, 255, 255], "Should be blue.");

	// Drawing when texture is bound to an inactive uniform should succeed
	var texture2 = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_2D, texture2);
	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
	new Uint8Array([0, 255, 0, 255]));
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

	gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
	gl.activeTexture(gl.TEXTURE1);
	gl.bindTexture(gl.TEXTURE_2D, texture);
	wtu.drawUnitQuad(gl);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after draw where framebuffer texture is bound to inactive texture unit");
	wtu.checkCanvas(gl, [255, 0, 0, 255], "Should be red.");

	var successfullyParsed = true;
	</script>

	<script src="../../resources/js-test-post.js"></script>

	</body>
	</html>