multisampled-renderbuffer-initialization.html (5707B)
1 <!-- 2 Copyright (c) 2019 The Khronos Group Inc. 3 Use of this source code is governed by an MIT-style license that can be 4 found in the LICENSE.txt file. 5 --> 6 7 <!DOCTYPE html> 8 <html> 9 <head> 10 <meta charset="utf-8"> 11 <link rel="stylesheet" href="../../resources/js-test-style.css"/> 12 <script src="../../js/js-test-pre.js"></script> 13 <script src="../../js/webgl-test-utils.js"></script> 14 </head> 15 <body> 16 <canvas id="testbed" width="40" height="40" style="width: 40px; height: 40px;"></canvas> 17 <div id="description"></div> 18 <div id="console"></div> 19 <script> 20 "use strict"; 21 var wtu = WebGLTestUtils; 22 description('Verify multisampled renderbuffers are initialized to 0 before being read in WebGL'); 23 24 var gl = wtu.create3DContext("testbed", null, 2); 25 26 if (!gl) { 27 testFailed('canvas.getContext() failed'); 28 } else { 29 // Set the clear color to green. It should never show up. 30 gl.clearColor(0, 1, 0, 1); 31 32 let c = gl.canvas; 33 var maxSamples = gl.getInternalformatParameter( 34 gl.RENDERBUFFER, gl.RGBA8, gl.SAMPLES)[0]; 35 for (let i = 0; i < 2; ++i) { 36 runTest(gl, {alloc1: {w: c.width, h: c.height, s: maxSamples}, alloc2: null}); 37 runTest(gl, {alloc1: null, alloc2: {w: c.width, h: c.height, s: maxSamples}}); 38 39 // Tests for initially allocating at the wrong size. 40 // This is caused by a Qualcomm driver bug: http://crbug.com/696126 41 runTest(gl, {alloc1: {w: 5, h: 5, s: maxSamples}, alloc2: {w: c.width, h: c.height, s: maxSamples}}); 42 runTest(gl, {alloc1: {w: 5, h: 5, s: maxSamples}, alloc2: {w: c.width, h: c.height, s: 0}}); 43 runTest(gl, {alloc1: {w: 5, h: 5, s: 0}, alloc2: {w: c.width, h: c.height, s: maxSamples}}); 44 } 45 46 // Testing buffer clearing won't change the clear values. 47 var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE); 48 shouldBe("clearColor", "[0, 1, 0, 1]"); 49 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors'); 50 } 51 52 function runTest(gl, params) { 53 debug("Test for color buffer: " + JSON.stringify(params)); 54 let resolve = params.alloc2 ? params.alloc2 : params.alloc1; 55 wtu.checkCanvasRect(gl, 0, 0, resolve.w, resolve.h, 56 [0, 0, 0, 0], 57 "internal buffers have been initialized to 0"); 58 59 // fill the back buffer so we know that reading below happens from 60 // the renderbuffer. 61 gl.clear(gl.COLOR_BUFFER_BIT); 62 63 // Set up non-multisampled buffer to blit to and read back from. 64 var fbo = gl.createFramebuffer(); 65 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); 66 var buffer = gl.createRenderbuffer(); 67 gl.bindRenderbuffer(gl.RENDERBUFFER, buffer); 68 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA8, resolve.w, resolve.h); 69 attachBuffer(buffer); 70 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", 71 "gl.FRAMEBUFFER_COMPLETE"); 72 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors'); 73 gl.clear(gl.COLOR_BUFFER_BIT); 74 wtu.checkCanvasRect(gl, 0, 0, resolve.w, resolve.h, 75 [0, 255, 0, 255], 76 "user buffer has been cleared to green"); 77 78 // Set up multisampled buffer to test. 79 var fbo_m = gl.createFramebuffer(); 80 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_m); 81 var buffer_m = gl.createRenderbuffer(); 82 gl.bindRenderbuffer(gl.RENDERBUFFER, buffer_m); 83 84 if (params.alloc1) { 85 allocStorage(params.alloc1.w, params.alloc1.h, params.alloc1.s); 86 } 87 attachBuffer(buffer_m); 88 if (params.alloc2) { 89 if (params.alloc1) { 90 // Clear the FBO in order to make sure framebufferRenderbuffer is 91 // committed. (In Firefox, framebufferRenderbuffer is deferred, so 92 // this is needed to trigger the bug.) 93 gl.clear(gl.COLOR_BUFFER_BIT); 94 } 95 allocStorage(params.alloc2.w, params.alloc2.h, params.alloc2.s); 96 } 97 98 function allocStorage(width, height, samples) { 99 gl.renderbufferStorageMultisample( 100 gl.RENDERBUFFER, samples, gl.RGBA8, width, height); 101 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 102 "should be no error after renderbufferStorageMultisample(RGBA8)."); 103 } 104 105 function attachBuffer(buffer) { 106 gl.framebufferRenderbuffer( 107 gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, buffer); 108 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 109 "should be no error after framebufferRenderbuffer."); 110 } 111 112 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", 113 "gl.FRAMEBUFFER_COMPLETE"); 114 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors'); 115 116 // Blit from multisampled buffer to non-multisampled buffer. 117 gl.bindFramebuffer(gl.READ_FRAMEBUFFER, fbo_m); 118 gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fbo); 119 // Blit color from fbo_m (should be black) to fbo (should be green) 120 gl.blitFramebuffer(0, 0, resolve.w, resolve.h, 121 0, 0, resolve.w, resolve.h, 122 gl.COLOR_BUFFER_BIT, gl.NEAREST); 123 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors'); 124 125 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); 126 wtu.checkCanvasRect(gl, 0, 0, resolve.w, resolve.h, 127 [0, 0, 0, 0], 128 "user buffer has been initialized to 0"); 129 130 gl.deleteFramebuffer(fbo_m); 131 gl.deleteRenderbuffer(buffer_m); 132 gl.deleteFramebuffer(fbo); 133 gl.deleteRenderbuffer(buffer); 134 135 // this clear should not matter we are about to resize 136 gl.clear(gl.COLOR_BUFFER_BIT); 137 138 gl.canvas.width += 1; 139 gl.canvas.height += 1; 140 141 wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'should be no errors'); 142 debug(''); 143 } 144 145 var successfullyParsed = true; 146 </script> 147 <script src="../../js/js-test-post.js"></script> 148 </body> 149 </html>