LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/renderbuffers/stencil-renderbuffer-initialization.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2017 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">
 <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="testbed" width="40" height="40" style="width: 40px; height: 40px;"></canvas>
 <div id="description"></div>
 <div id="console"></div>
 <script>
 "use strict";
 var wtu = WebGLTestUtils;
 description('Verify stencil renderbuffers are initialized to 0 before being read in WebGL');

 var gl = wtu.create3DContext("testbed");

 if (!gl) {
     testFailed('canvas.getContext() failed');
 } else {
     // Set the clear color to green. It should never show up.
     gl.clearColor(0, 1, 0, 1);
     gl.disable(gl.DEPTH_TEST);
     gl.disable(gl.STENCIL_TEST);

     let c = gl.canvas;
     for (let i = 0; i < 2; ++i) {
         runTest(gl, {alloc1: {w: c.width, h: c.height}, alloc2: null});
         runTest(gl, {alloc1: null, alloc2: {w: c.width, h: c.height}});
         // Tests for initially allocating at the wrong size.
         runTest(gl, {alloc1: {w: 5, h: 5}, alloc2: {w: c.width, h: c.height}});
     }

     // Testing buffer clearing won't change the clear values.
     var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE);
     shouldBe("clearColor", "[0, 1, 0, 1]");
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
 }

 function runTest(gl, params) {
     debug("Test for stencil buffer: " + JSON.stringify(params));
     let final = params.alloc2 ? params.alloc2 : params.alloc1;
     gl.viewport(0, 0, final.w, final.h);
     wtu.checkCanvasRect(gl, 0, 0, final.w, final.h,
                         [0, 0, 0, 0],
                         "internal buffers have been initialized to 0");

     gl.disable(gl.STENCIL_TEST);

     // fill the back buffer so we know that reading below happens from
     // the renderbuffer.
     gl.clearStencil(2);
     gl.clear(gl.COLOR_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);

     // Set up (color+stencil) test buffer.
     var fbo = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
     var buffer = gl.createRenderbuffer();
     var stencilBuffer = gl.createRenderbuffer();

     if (params.alloc1) {
         gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
         allocStorage(gl.RGBA4, params.alloc1.w, params.alloc1.h);
         gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
         allocStorage(gl.STENCIL_INDEX8, params.alloc1.w, params.alloc1.h);
     }
     gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
     gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, buffer);
     gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
     gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, stencilBuffer);
     if (params.alloc2) {
         if (params.alloc1) {
             if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
                 debug("Skip: framebuffer is allowed to be incomplete.");
                 return;
             }
             // Clear the FBO in order to make sure framebufferRenderbuffer is
             // committed.
             gl.clear(gl.COLOR_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
         }
         gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
         allocStorage(gl.RGBA4, params.alloc2.w, params.alloc2.h);
         gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
         allocStorage(gl.STENCIL_INDEX8, params.alloc2.w, params.alloc2.h);
     }

     function allocStorage(format, width, height) {
         gl.renderbufferStorage(gl.RENDERBUFFER, format, width, height);
         wtu.glErrorShouldBe(gl, gl.NO_ERROR,
             "should be no error after renderbufferStorage.");
     }

     if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
         debug("Skip: framebuffer is allowed to be incomplete.");
         return;
     }
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');

     // fbo depth should now be the default value of 0.

     // Draw a blue quad (stencil = 1) (should pass the stencil test: 1 > 0)
     gl.stencilFunc(gl.GREATER, 1, 0xffffffff);
     gl.enable(gl.STENCIL_TEST);
     wtu.setupColorQuad(gl);
     wtu.setFloatDrawColor(gl, [0, 0, 1, 1]);
     wtu.drawUnitQuad(gl);
     wtu.checkCanvasRect(gl, 0, 0, final.w, final.h,
                         [0, 0, 255, 255]);

     gl.deleteFramebuffer(fbo);
     gl.deleteRenderbuffer(buffer);

     gl.canvas.width += 1;
     gl.canvas.height += 1;

     wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
     debug('');
 }

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

	/*
	** Copyright (c) 2017 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">
	<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="testbed" width="40" height="40" style="width: 40px; height: 40px;"></canvas>
	<div id="description"></div>
	<div id="console"></div>
	<script>
	"use strict";
	var wtu = WebGLTestUtils;
	description('Verify stencil renderbuffers are initialized to 0 before being read in WebGL');

	var gl = wtu.create3DContext("testbed");

	if (!gl) {
	testFailed('canvas.getContext() failed');
	} else {
	// Set the clear color to green. It should never show up.
	gl.clearColor(0, 1, 0, 1);
	gl.disable(gl.DEPTH_TEST);
	gl.disable(gl.STENCIL_TEST);

	let c = gl.canvas;
	for (let i = 0; i < 2; ++i) {
	runTest(gl, {alloc1: {w: c.width, h: c.height}, alloc2: null});
	runTest(gl, {alloc1: null, alloc2: {w: c.width, h: c.height}});
	// Tests for initially allocating at the wrong size.
	runTest(gl, {alloc1: {w: 5, h: 5}, alloc2: {w: c.width, h: c.height}});
	}

	// Testing buffer clearing won't change the clear values.
	var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE);
	shouldBe("clearColor", "[0, 1, 0, 1]");
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
	}

	function runTest(gl, params) {
	debug("Test for stencil buffer: " + JSON.stringify(params));
	let final = params.alloc2 ? params.alloc2 : params.alloc1;
	gl.viewport(0, 0, final.w, final.h);
	wtu.checkCanvasRect(gl, 0, 0, final.w, final.h,
	[0, 0, 0, 0],
	"internal buffers have been initialized to 0");

	gl.disable(gl.STENCIL_TEST);

	// fill the back buffer so we know that reading below happens from
	// the renderbuffer.
	gl.clearStencil(2);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.STENCIL_BUFFER_BIT);

	// Set up (color+stencil) test buffer.
	var fbo = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
	var buffer = gl.createRenderbuffer();
	var stencilBuffer = gl.createRenderbuffer();

	if (params.alloc1) {
	gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
	allocStorage(gl.RGBA4, params.alloc1.w, params.alloc1.h);
	gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
	allocStorage(gl.STENCIL_INDEX8, params.alloc1.w, params.alloc1.h);
	}
	gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
	gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, buffer);
	gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
	gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, stencilBuffer);
	if (params.alloc2) {
	if (params.alloc1) {
	if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
	debug("Skip: framebuffer is allowed to be incomplete.");
	return;
	}
	// Clear the FBO in order to make sure framebufferRenderbuffer is
	// committed.
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.STENCIL_BUFFER_BIT);
	}
	gl.bindRenderbuffer(gl.RENDERBUFFER, buffer);
	allocStorage(gl.RGBA4, params.alloc2.w, params.alloc2.h);
	gl.bindRenderbuffer(gl.RENDERBUFFER, stencilBuffer);
	allocStorage(gl.STENCIL_INDEX8, params.alloc2.w, params.alloc2.h);
	}

	function allocStorage(format, width, height) {
	gl.renderbufferStorage(gl.RENDERBUFFER, format, width, height);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR,
	"should be no error after renderbufferStorage.");
	}

	if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
	debug("Skip: framebuffer is allowed to be incomplete.");
	return;
	}
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');

	// fbo depth should now be the default value of 0.

	// Draw a blue quad (stencil = 1) (should pass the stencil test: 1 > 0)
	gl.stencilFunc(gl.GREATER, 1, 0xffffffff);
	gl.enable(gl.STENCIL_TEST);
	wtu.setupColorQuad(gl);
	wtu.setFloatDrawColor(gl, [0, 0, 1, 1]);
	wtu.drawUnitQuad(gl);
	wtu.checkCanvasRect(gl, 0, 0, final.w, final.h,
	[0, 0, 255, 255]);

	gl.deleteFramebuffer(fbo);
	gl.deleteRenderbuffer(buffer);

	gl.canvas.width += 1;
	gl.canvas.height += 1;

	wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors');
	debug('');
	}

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