third_party/WebKit/LayoutTests/fast/canvas/webgl/uninitialized-test.html

   1 <!doctype html>
   2 <html>
   3 <head>
   4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
   5 <title>WebGL Uninitialized GL Resources Tests</title>
   6 <script src="../../../resources/js-test.js"></script>
   7 <script src="resources/webgl-test.js"></script>
   8 </head>
   9 <body>
  10 <div id="description"></div>
  11 <div id="console"></div>
  12 <canvas id="canvas" width="2" height="2"> </canvas>
  13 <script>
  14 description("Tests to check user code cannot access uninitialized data from GL resources.");
  15
  16 var canvas = document.getElementById("canvas");
  17 var gl = create3DContext(canvas);
  18 if (!gl)
  19   testFailed("Context created.");
  20 else
  21   testPassed("Context created.");
  22
  23 function setupTexture(texWidth, texHeight) {
  24     var texture = gl.createTexture();
  25     gl.bindTexture(gl.TEXTURE_2D, texture);
  26     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, texWidth, texHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
  27
  28     // this can be quite undeterministic so to improve odds of seeing uninitialized data write bits
  29     // into tex then delete texture then re-create one with same characteristics (driver will likely reuse mem)
  30     // with this trick on r59046 WebKit/OSX I get FAIL 100% of the time instead of ~15% of the time.
  31
  32     var badData = new Uint8Array(texWidth * texHeight * 4);
  33     for (var i = 0; i < badData.length; ++i)
  34         badData[i] = i % 255;
  35
  36     gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, texWidth, texHeight, gl.RGBA, gl.UNSIGNED_BYTE, badData);
  37     gl.finish(); // make sure it has been uploaded
  38
  39     gl.deleteTexture(texture);
  40     gl.finish(); // make sure it has been deleted
  41
  42     var texture = gl.createTexture();
  43     gl.bindTexture(gl.TEXTURE_2D, texture);
  44     return texture;
  45 }
  46
  47 function checkNonZeroPixels(texture, texWidth, texHeight, skipX, skipY, skipWidth, skipHeight, skipR, skipG, skipB, skipA) {
  48     gl.bindTexture(gl.TEXTURE_2D, null);
  49     var fb = gl.createFramebuffer();
  50     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  51     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
  52     shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
  53
  54     var data = new Uint8Array(texWidth * texHeight * 4);
  55     gl.readPixels(0, 0, texWidth, texHeight, gl.RGBA, gl.UNSIGNED_BYTE, data);
  56
  57     var k = 0;
  58     for (var y = 0; y < texHeight; ++y) {
  59         for (var x = 0; x < texWidth; ++x) {
  60             var index = (y * texWidth + x) * 4;
  61             if (x >= skipX && x < skipX + skipWidth && y >= skipY && y < skipY + skipHeight) {
  62                 if (data[index] != skipR || data[index + 1] != skipG || data[index + 2] != skipB || data[index + 3] != skipA) {
  63                     testFailed("non-zero pixel values are wrong");
  64                     return;
  65                 }
  66             } else {
  67                 for (var i = 0; i < 4; ++i) {
  68                     if (data[index + i] != 0)
  69                         k++;
  70                 }
  71             }
  72         }
  73     }
  74     if (k) {
  75         testFailed("Found " + k + " non-zero bytes");
  76     } else {
  77         testPassed("All data initialized");
  78     }
  79 }
  80
  81 var width = 512;
  82 var height = 512;
  83
  84 debug("");
  85 debug("Reading an uninitialized texture (texImage2D) should succeed with all bytes set to 0.");
  86
  87 var tex = setupTexture(width, height);
  88 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
  89 checkNonZeroPixels(tex, width, height, 0, 0, 0, 0, 0, 0, 0, 0);
  90 gl.deleteTexture(tex);
  91 gl.finish();
  92 glErrorShouldBe(gl, gl.NO_ERROR);
  93
  94 debug("");
  95 debug("Reading an uninitialized portion of a texture (copyTexImage2D) should succeed with all bytes set to 0.");
  96
  97 var tex = setupTexture(width, height);
  98 var fbo = gl.createFramebuffer();
  99 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 100 var rbo = gl.createRenderbuffer();
 101 gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
 102 var fboWidth = 16;
 103 var fboHeight = 16;
 104 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
 105 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
 106 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
 107 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 108 gl.clear(gl.COLOR_BUFFER_BIT);
 109 glErrorShouldBe(gl, gl.NO_ERROR);
 110 gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, width, height, 0);
 111 checkNonZeroPixels(tex, width, height, 0, 0, fboWidth, fboHeight, 255, 0, 0, 255);
 112 gl.deleteTexture(tex);
 113 gl.finish();
 114 glErrorShouldBe(gl, gl.NO_ERROR);
 115
 116 debug("");
 117 debug("Reading an uninitialized portion of a texture (copyTexImage2D with negative x and y) should succeed with all bytes set to 0.");
 118
 119 var tex = setupTexture(width, height);
 120 var fbo = gl.createFramebuffer();
 121 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 122 var rbo = gl.createRenderbuffer();
 123 gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
 124 var fboWidth = 16;
 125 var fboHeight = 16;
 126 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
 127 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
 128 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
 129 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 130 gl.clear(gl.COLOR_BUFFER_BIT);
 131 glErrorShouldBe(gl, gl.NO_ERROR);
 132 var x = -8;
 133 var y = -8;
 134 gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, x, y, width, height, 0);
 135 checkNonZeroPixels(tex, width, height, -x, -y, fboWidth, fboHeight, 255, 0, 0, 255);
 136 gl.deleteTexture(tex);
 137 gl.finish();
 138 glErrorShouldBe(gl, gl.NO_ERROR);
 139
 140 debug("");
 141 debug("Reading an uninitialized portion of a texture (copyTexImage2D from WebGL internal fbo) should succeed with all bytes set to 0.");
 142
 143 var tex = setupTexture(width, height);
 144 gl.bindFramebuffer(gl.FRAMEBUFFER, null);
 145 gl.clearColor(0.0, 1.0, 0.0, 0.0);
 146 gl.clear(gl.COLOR_BUFFER_BIT);
 147 glErrorShouldBe(gl, gl.NO_ERROR);
 148 gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, width, height, 0);
 149 checkNonZeroPixels(tex, width, height, 0, 0, canvas.width, canvas.height, 0, 255, 0, 0);
 150 gl.deleteTexture(tex);
 151 gl.finish();
 152 glErrorShouldBe(gl, gl.NO_ERROR);
 153
 154 debug("");
 155 debug("Reading an uninitialized portion of a texture (copyTexSubImage2D) should succeed with all bytes set to 0.");
 156
 157 var tex = gl.createTexture();
 158 gl.bindTexture(gl.TEXTURE_2D, tex);
 159 var data = new Uint8Array(width * height * 4);
 160 for (var i = 0; i < width * height * 4; ++i)
 161     data[i] = 255;
 162 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, data);
 163 glErrorShouldBe(gl, gl.NO_ERROR);
 164 var fbo = gl.createFramebuffer();
 165 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 166 var rbo = gl.createRenderbuffer();
 167 gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
 168 var fboWidth = 16;
 169 var fboHeight = 16;
 170 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
 171 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
 172 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
 173 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 174 gl.clear(gl.COLOR_BUFFER_BIT);
 175 glErrorShouldBe(gl, gl.NO_ERROR);
 176 gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
 177 checkNonZeroPixels(tex, width, height, 0, 0, fboWidth, fboHeight, 255, 0, 0, 255);
 178 gl.deleteTexture(tex);
 179 gl.finish();
 180 glErrorShouldBe(gl, gl.NO_ERROR);
 181
 182 debug("");
 183 debug("Reading an uninitialized portion of a texture (copyTexSubImage2D with negative x and y) should succeed with all bytes set to 0.");
 184
 185 var tex = gl.createTexture();
 186 gl.bindTexture(gl.TEXTURE_2D, tex);
 187 var data = new Uint8Array(width * height * 4);
 188 for (var i = 0; i < width * height * 4; ++i)
 189     data[i] = 255;
 190 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, data);
 191 glErrorShouldBe(gl, gl.NO_ERROR);
 192 var fbo = gl.createFramebuffer();
 193 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 194 var rbo = gl.createRenderbuffer();
 195 gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
 196 var fboWidth = 16;
 197 var fboHeight = 16;
 198 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
 199 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
 200 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
 201 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 202 gl.clear(gl.COLOR_BUFFER_BIT);
 203 glErrorShouldBe(gl, gl.NO_ERROR);
 204 var x = -8;
 205 var y = -8;
 206 gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, x, y, width, height);
 207 checkNonZeroPixels(tex, width, height, -x, -y, fboWidth, fboHeight, 255, 0, 0, 255);
 208 gl.deleteTexture(tex);
 209 gl.finish();
 210 glErrorShouldBe(gl, gl.NO_ERROR);
 211
 212 debug("");
 213 debug("Reading an uninitialized portion of a texture (copyTexSubImage2D from WebGL internal fbo) should succeed with all bytes set to 0.");
 214
 215 var tex = gl.createTexture();
 216 gl.bindTexture(gl.TEXTURE_2D, tex);
 217 var data = new Uint8Array(width * height * 4);
 218 for (var i = 0; i < width * height * 4; ++i)
 219     data[i] = 255;
 220 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, data);
 221 glErrorShouldBe(gl, gl.NO_ERROR);
 222 gl.bindFramebuffer(gl.FRAMEBUFFER, null);
 223 gl.clearColor(0.0, 1.0, 0.0, 0.0);
 224 gl.clear(gl.COLOR_BUFFER_BIT);
 225 glErrorShouldBe(gl, gl.NO_ERROR);
 226 gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, width, height);
 227 checkNonZeroPixels(tex, width, height, 0, 0, canvas.width, canvas.height, 0, 255, 0, 0);
 228 gl.deleteTexture(tex);
 229 gl.finish();
 230 glErrorShouldBe(gl, gl.NO_ERROR);
 231
 232 //TODO: uninitialized vertex array buffer
 233 //TODO: uninitialized vertex elements buffer
 234 //TODO: uninitialized framebuffer? (implementations would need to do a GL clear at first binding?)
 235 //TODO: uninitialized renderbuffer? (implementations would need to do a GL clear at first binding?)
 236 //TODO: uninitialized uniform arrays?
 237
 238 debug("");
 239 </script>
 240 </body>
 241 </html>
 242